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1. Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 15 in wc 1475 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 Page 21 Feb 00 Maritime Geothermal Ltd Capacity Data Heating Mode Model RH 42 HAC Nominal 3 5 ton Comp otal Watts Watts 3097 3 3620 3035 3560 3077 5 3600 2965 3488 3001 3525 3034 3559 2834 3357 2865 3386 2892 3415 2705 3226 2730 3250 2753 3276 2577 3097 2598 3116 2617 3136 2452 2972 2470 2989 2484 3002 2497 3015 24700 35265 Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB CFM 1650 External static 15 in wc RH 42 HAC Cooling Mode Total Sens Latent Comp A CO gt A 77 35 6 89 5 12 7 47947 3 38 79 5 56 0 23 5 35057 13965 49430 13 37 2998 3 1 516 3514 5 14 1 Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 15 in wc 1650 CFM In accordance with ARI 325 and 33
2. as Back Side H 11 ic Supply Air G i Electrical Box Access SE L 0 1 2 Condensate Drain Left Side Left Side Return Air 1 Thermostat Access jen ae 2 Aux Electrical Access d H 3 Main Electrical Access ET 1 H 4 Domestic Hot Water IN EH 18 K 5 Domestic Hot Water Out Evaporator 42 i H a 6 Refrigerant Access Ports H 7 Supply Liquid IN B H 8 Supply Liquid Out EE QUO Right Side Supply Air Right Side Hanger Bracket Dimensions Model Size RH 13 19 24 in 35 22 3 3 4 9 7 16 10 1 2 1 11 16 18 16 35 23 1 2 20 1 2 RH 30 36 42 in 43 27 4 7 8 10 3 4 11 5 8 1 11 16 18 24 43 28 1 2 25 1 2 RH 48 60 in 55 27 6 3 8 13 3 8 11 5 8 1 11 16 18 39 55 28 1 2 25 1 2 Model RH 13 RH 19 Physical Data RH 24 RH 30 RH 42 RH 48 RH 60 Blower wheel G7 5 G9 5 G7 GT9 G9 7 G9 8 G9 10 8 Fan Motor Speeds 1 6 3 1 6 3 1 3 3 1 3 3 1 2 3 1 2 3 3 4 3 3 4 3 CFM High 1 H20 500 730 840 1300 1550 1700 1975 2400 Comp Nominal HP 1 0 1 5 2 0 2 5 3 0 3 5 4 0 5 0 R 22 Charge Ibs 2 0 2 5 3 5 4 5 5 0 5 5 6 5 7 5 Coil Face Area Sq ft 1 08
3. 00 09 CO 05 CO OD OO 4 105 0 1 Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB CFM 810 External static 15 in wc RH 24 HAC Cooling Mode Total Sens Latent Comp 31662 33245 35074 30712 32248 34021 29791 31280 33001 28897 30342 77 35 6 85 1 83 31050 3 4 79 5 52 8 26 7 20905 9808 32011 9 5 2124 1 92 324 2448 1 13 1 12 7 Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 15 in wc 810 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 A CO CO A ooje Page 19 Feb 00 Maritime Geothermal Ltd Capacity Data Heating Mode Model RH 30 HAC Nominal 2 5 ton Comp otal Watts Watts 2612 2985 2560 2934 2594 2967 2500 2873 2529 2902 2556 2930 2388 2761 2413 2784 2435 2808 2278 2649 2299 2668 2317 2690 2170 2539 2187 2555 2201 2571 2064 2433 2078 2447 2089 2457 2099 2467 20403 29229 Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water Rating conditions Voltage 230
4. Diameter in inches Duct Sizing Guide Rectangular Equivalents Return Air Diameter Feb 00 Required CFM 5 2 25 x 10 3x8 3 5x6 4x5 5 5x5 37 2 25 x 10 3x8 3 5x6 4x5 5 5x5 63 3 25 x 10 4x8 5x6 5 5 5 5 6x6 100 3 25 x 14 4 11 5 x 8 5 6x7 6 5 x 6 5 152 4x15 5x12 6x 10 7x8 8x8 VD Ji nt 4x15 5x 12 6x 10 7x8 8x8 5x15 12 7x 10 8x9 8 5 x 8 5 5x15 6x 12 7 x 10 8x9 8 5 x 8 5 6x 15 7 x 13 8x11 9x10 9 5 x 9 5 7x18 8x16 9x 14 10 x 12 11x11 7x18 8x16 9x14 10x 12 11x11 8x22 9x19 10x 17 11x15 12x 14 8x22 9x 19 10x 17 11x15 12x 14 8 x 30 10 x 22 12x 18 14 x 16 15 15 8x30 10 x 22 12x 18 14 x 16 15 15 8 x 40 10 x 30 12 x 24 14 x 20 16x 17 16 5 x 16 5 8 x 40 10 x 30 12 x 24 14 x 20 16x 17 16 5 x 16 5 10 x 38 12 x 30 14 x 26 16 x 22 18 x 19 18 5 x 18 5 10 x 38 12 x 30 14 x 26 16 x 22 18 x 19 18 5 18 5 12 x 36 14 x 30 16 x 26 18 x 23 20 x 20 12 x 36 14 x 30 16 x 26 18 x 23 20 x 20 14 x 38 16 x 32 18 x 28 20 x 25 22 x 22 14 x 38 16 x 32 18 x 28 20 x 25 22 x 22 16 38 18 32 20 30 22 24 24
5. 24 18 38 20 34 22 30 24 28 26 26 18 38 20 34 22 30 24 28 26 26 20 40 22 38 24 32 26 30 28 28 20 40 22 38 24 32 26 30 28 28 22 40 24 38 26 34 28 32 30 30 22 40 24 38 26 34 28 32 30 30 24 42 25 40 26 x 38 28 x 34 30 x 32 24 x 42 25 x 40 26 x 38 28 x 34 30 x 32 28 x 40 30 x 36 32 x 34 33x33 30 x 42 32 x 38 34 x 36 35x35 CEREREM SEEN SCRI 30 x 45 34 x 40 36 x 38 Page 37 x 37 3l Feb 00 Maritime Geothermal Ltd LIMITED WARRANTY MARITIME GEOTHERMAL LTD warrants that the heat pumps manufactured by it shall be free from defects in materials and workmanship for a period of 1 ONE YEAR after the date of installation or for a period of 1 ONE YEAR AND 60 SIXTY DAYS after the date of shipment which ever occurs first In addition MARITIME GEOTHERMAL LTD warrants that the compressor shall be free of defects in materials and workmanship for an additional period of 48 FORTY EIGHT MONTHS from said date MARITIME GEOTHERMAL LTD shall at it s option repair or replace any part or parts covered by this warranty which shall be returned to MARI TIME GEOTHERMAL LTD transportation charges prepaid which upon examination proves to be defecti
6. Maritime Installation Geothermal Ltd Manual Models RH 13 19 24 30 36 42 48 60 Horizontal Slim Line Liquid Source Heat Pumps Table of Contents Horiz amp Vertical Groundloops Troubleshooting Guide Physical Data Dimensions Summary of Requirements Socket Fusion Schematic Diagram Unpacking Placement Well Plumbing Water Disposal Methods Pump Modules amp Piping Field Wiring Diagram Flushing amp Purging the Loop Plenum Heater Connections Condensate Drain Hot Water Piping Antifreeze selection amp quantity Duct sizing Guide Safety Controls Electrical Ductwork Pressurizing the Loop Warranty Starting the heat pump Electrical Specifications General Maintenance CFM Available Ji Cl Cl G nn BR 9 Introduction to Groundloops Performance Specifications For Water Well or Groundloop Operation SP LR 56328 Maritime Geothermal Ltd P O Box 413 Email nordic atcon com Petitcodiac N B E0A 2H0 http www discribe ca nordic mgmain htm Feb 00 Maritime Geothermal Ltd Physical Data amp Dimensions RH Commercial Series Return Air Legend ja 4 piti 0 9 a 0 3 4 20 1 2 LHA H 3 4 FPT Condensate
7. ing system can alternately be constructed using a 45 gal bar rel and a pump with sufficient volume and head capability to circulate fluid at a velocity of at least 2 ft min through all parts of the loop Begin pumping water through the earthloop making sure that the intake of the pump stays submerged at all times by continuously adding water from a hose etc Water flowing back on the return line should be directed below the water level in the barrel or flush tank to prevent air being mixed with the outgoing water Once the lines have been filled and no more air bubbles are appearing in the line adjust Table 2 US Gal of fluid per 100 ft of pipe Diameter Volume US gal Type of Pipe Copper 1 4 1 1 1 4 6 4 1 1 2 9 2 Rubber Hose 1 3 9 Polyethylene 3 4 IPS 50 11 2 8 1 IPS SDRII 4 5 1 1 4 IPS SDR11 8 0 1 1 2 IPS SDR11 10 9 2 IPS SDRII 18 0 Heat Exchanger Average 1 5 Flush Cart Tank 15 D x 3 ft high 28 the flow valves to circulate water through the heat pump us ing the same technique as described above When all air is Page 11 Feb 00 Maritime Geothermal Ltd NORDIC Horizontal Trench Design Closed loop Plastic Earthloop Next trench line Elevation View Next trench line Backfill with heavy dense material if excavated material contains rock which may damage the tubing 3 4 Type 3408 Plastic Undis
8. 1 58 2 00 2 50 3 00 3 50 4 08 4 83 No of Circuits 6 6 8 8 8 8 8 8 Filter size OU 20 x20 20 x 20 20 x20 Page 2 20x14 2 20x14 2 20x14 2 20 x20 2 2 0 20 2 Maritime Geothermal Ltd Feb 00 RH Commercial Series Water Well Installation There are five specific parts or sub systems to a groundwater heat pump installation 1 The Source of energy 2 The method of supplying energy to the heat pump 3 Converting energy to a useable form 4 Distributing the heat 5 Returning exhaust water to the earth for reheating Water Well Requirements 1 A DRILLED well of 5 diameter or larger 2 Well casing properly sealed or grouted into rock 3 Water flow preferably entering well at a depth of 75 ft or more 4 Temperature of well at least 40 F Normally 454 F 5 Well must be able to supply requirements of all heat pumps in use at the same time with maximum drawdown from static level of 30 ft 6 A return well or approved open discharge method approved by the local governing authority Water Requirements For Nordic Heat Pumps Note These are minimum water requirements based on Flow usgpm an entering water temperature of 46 F Water Pump System 1 A submersible pump is generally required 2 Must be able to pump the required water flow listed above at
9. 18682 57 1120 0 95 160 1280 428 3 94 65 2 9 04 53 8 11 3 13573 08 70 104 34 0 18309 57 1131 0 94 159 1289 4 17 4 01 60 6 27 12 562 37 13157 297 70 103 333 17943 56 1143 0 95 160 1303 404 3 52 60 4 18 08 546 53 12762 1 32 70 102 327 17584 5 6 1151 0 94 159 1310 394 3 60 60 2 9 04 49 6 10 3 12379 0 85 70 102 32 0 17232 5 5 1159 0 94 159 1318 384 3 68 55 6 27 12 51 9 33 11999 324 71 102 314 16887 54 1167 0 93 157 1324 374 3 22 55 4 1808 506 48 11639 159 70 101 307 16550 5 4 1173 0 95 160 1333 3 64 3 30 55 2 904 458 94 11290 0 82 71 101 30 1 16219 53 1177 0 93 157 1334 357 3 41 50 6 27 12 47 0 3 0 10943 324 70 100 29 5 15894 53 1182 0 93 157 1339 3 48 2 96 50 4 18 08 45 6 44 10615 194 70 99 289 15576 52 1185 0 92 155 1340 3 41 3 07 50 2 904 414 86 10296 0 86 70 98 283 15265 51 1187 0 93 157 1343 333 3 17 45 6 2712 423 28 9980 341 70 98 278 14960 5 1 1189 0 94 159 1348 326 2 74 45 4 18 08 41 1 4 0 9680 1 94 71 98 272 14660 5 0 1189 0 93 157 1346 320 2 86 45 2 9 04 373 78 9390 089 70 96 267 14367 5 0 1189 0 93 157 1345 3 13 2 97
10. Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water 9 04 25 2 6 79 8153 1 45 70 93 2 23 2 12515 4 5 1124 0 91 154 1278 2 87 2 79 27 1 27 7 2 35 8448 5 21 70 93 7 23 7 12788 4 4 1120 0 90 152 1272 2 95 2 81 18 1 26 6 3 43 8237 2 85 70 2 93 5 23 3 12562 4 4 1115 0 90 152 1267 2 90 2 78 40 6 27 1 3 258 E2 599 MOT 5 31 71 95 9 25 4 13700 5 1 1189 0 92 155 1344 2 99 2 85 40 4 18 1 36 3 3 7 8884 3 12 69 8 94 8 25 0 13462 5 1 1184 0 93 157 1341 2 94 2 82 40 2 9 04 32 8 7 22 8662 1 58 69 8 94 4 24 6 13229 5 0 1180 0 94 159 1338 2 90 2 82 38 6 27 1 35 5 2 49 8975 5 3 69 6 94 7 25 1 13509 5 1 1175 0 91 154 1329 2 98 2 84 38 4 18 1 34 4 3 65 8750 3 69 6 94 3 24 7 13274 5 0 1170 0 92 155 1326 2 93 2 81 38 2 9 04 30 9 7 11 8532 1 48 69 8 94 0 242 13040 4 9 1166 0 92 155 1321 2 89 2 81 36 6 27 1 33 5 2 46 8840 5 3 69 6 94 3 24 7 13326 4 9 1161 0 91 154 1314 2 97 2 83 36 4 18 1 32 4 3 59 8619 2 91 69 8 94 1 24 3 13090 4 8 1156 0 91 154 1310 2 93 2 81 36 2 9 04 29 0 7 8404 1 5 70 5 94 4 23 9 12858 4 8 1152 0 91 154 1305 2 89 2 81 34 6 27 1 31 6 2 42 8707 5 27 69 8 94 2 24 4 13146 4 7 1147 0 91 154 1301 2 96 2 82 34 4 18 1 30 5 3 54 8490 2 91 70 2 94 2 24 0 12907 4 7 1142 0 90 152 1294 2 92 2 80 34 2 9 04 27 1 6 9 8278 1 38 69 6 93 2 23 6 12685 4 6 1138 0
11. a minimum of 30 psig at the dy namic pumping depth of your well 3 Make sure you select the pump using the pump manufacturers pump chart 4 Use a minimum of 30 gal equivalent air bladder tank Page 3 Water Well Water Pump System Heat Pump gt gt Ductwork gt Water Disposal Sizing The Heat Pump A heat pump with Btu output capable of heating the space in all winter weather conditions should be selected us ing a computerized heat load software package and the per formance charts in the engineering section of this manual Heating cooling analysis software is available from several sources on the Internet or from your local HVAC dealer Con tact us for an Microsoft Excel spreadsheet version of the above Duct Systems Basic A duct system capable of supplying the required air flow is of utmost importance Generally allow 100 cfm for each floor grill e All leads to the grills should be 6 in diameter 28 sq in each Your main hot air trunks should be at least 75 of the square surface area of leads being fed at any given point Return air grills should have the same total square surface area supply trunks and the return trunks be made with TURNING RADII Remember that air is a fluid and just like water resistance to flow increases when air is forced around a SHARP corner Discharge Water Methods 1 You do NOT necessarily have to have a return well 2 8096 of our customers do
12. be made to prevent the cooled dis charge water from immediately coming in contact with the supply source Generally speaking returning water to a sec ond well pond lake or stream is acceptable while returning Feb 00 water to the same well will usually cool the water so much that the heat pump will shut off on it s low pressure tempera ture safety control A return well should be a minimum of 80 ft from the supply well for residential applications The water returned to the well will not be necessarily be pumped into the same aqui fer depending on underground conditions but the return well does have to be able to supply the same quantity of water as the amount you wish to recharge into it If the static level level when not being pumped of a well is high 10 to 20 ft from the surface it may be necessary to place a well cap on the well to keep the return water from flowing out the top of the well This cap is commonly re quired since a certain amount of pressure is needed to force the return water back down the well if the static level is high Return wells are not always the answer and to some it may be more satisfactory to pump the water to a pond or away to another location Water recharged naturally through percolation into the soil is an alternative to a recharge well The water discharged will generally soak into the ground within a distance of 50 to 100 ft If care is taken to make sure the end of the pipe does not
13. ft of each size pipe in the system and referencing Table 2 the for approximate volume per 100 ft When the volume of the loop has been calculated and the appropriate amount of antifreeze is ready for addition by referencing Table 1 drain the equivalent amount of water from the flush cart or mixing barrel and replace it with the antifreeze When using alcohols be sure to inject it below the water line to reduce initial volatility of the pure antifreeze If the loop is large and the tank is small it may be necessary to Page refill the tank with antifreeze several times to get all the anti freeze into the loop Pump the loop for 5 to 10 minutes longer to insure the remaining fluid has been well mixed Initial Pressurization At this point open all valves in the flow circuit and slowly close off the supply and return flush cart valves in a manner that leaves about 20 30 psig on the system If an air bladder expansion tank is used it should be charged to the above pressure before actual water pressure is put on the sys tem Systems employing a commercially available loop pump kit that do not have an expansion tank thermometers and pressure gauges will experience a greater fluctuation of pres sure in the loop between winter and summer This fluctuation is normal since expansion and contraction of the loop fluid must be handled by the elasticity of the plastic loop Pressur ize the loop to a pressure of 45 psig when installing a
14. solution of methanol amp water BID 4 OD AIDIN AION SA Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB CFM 675 External static 1 in wc RH 19 HAC Cooling Mode Total Cool Latent Cool 9631 10113 10669 9342 9809 10349 9062 9515 10038 8790 9229 77 27 6 86 1 9 3 26990 3 38 79 5 54 6 24 9 17648 9737 27825 8 5 1897 1 10 186 2082 13 4 13 1 Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 1 in wc 675 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 Sens Cool Comp Amps LAT Diff N AINI AINOA Page 18 Maritime Geothermal Ltd Feb 00 Capacity Data Heating Mode Model RH 24 HAC Nominal 2 ton otal Watts 2111 2074 2106 2199 2224 2243 2267 2282 2296 2311 2324 2329 2340 2343 2349 2356 2355 2354 2351 8 05 0 05 00 4 05 00 4 09 00 05 00 blo Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water
15. system in the fall going into the heating season If installing in spring or summer charge to 25 psig After operating the machine for a period of time any residual air in the system can be bled off through valved verti cal standpipes in the pump module If pressure drops below 25 psig add additional water antifreeze mix with the purge pump to bring the pressure back to the original setting 13 Feb 00 Maritime Geothermal Ltd cooune Inside Plumbing Heat Pump to Groundloop Galvanized or PVC Fittings Transition from Galvanized E to 3408 PE made here EE xpansion gt from THESE cart Tank 20 E 4 NORDIC Ee 3 17 e Water 9 2 10 2 CH d fy Basement Air T 7 Iv ER 14 15 d 220 23 Wal Heat BOUM PE 3408 To Pump z Qui 2383 14 14 m utside 1 11 8 13 18 is 4 N 24 Loop i de 2222 Field P T Plugs 2 3408 SE x 26 7 19 M d O 1 1 4 galv lines Bass MPT to plastic adapter Shown above is one possible method of connecting a geothermal heat pump to a typical polyethelene groundloop The configuration above allows for two pumps however one pump may be omitted if pressure drop calculations dictate Provisions are shown for incoming and outgoing pressure guages and thermometers as well as an expansion tank and a pressure relief valve Flush cart con
16. valve for proper operation Replace Water supply too cold Measure temperature of water Check flow rate with spec sheet to determine if proper gpm is available Increase flow to proper gpm Ambient air too cold Measure return air temp Should be above 60 F Restrict air flow temporarily until room comes up to tem perature Faulty low pressure ctrl Faulty low temp ctrl Refrigerant pressure control should open on drop at approx 45 psig Temp ctrl will open in about 1 minute if water flow is inter rupted or if unit is run with suction pressure below 50 psig Both controls should reset automatically Heat pump can then be restarted by resetting the lock out relay Turn power off then back on Re place faulty control if it will not reset Low refrigerant charge No water flow Unit trips out on it s high pressure limit Check water temp and flow Clean heat exchanger If suc tion is still low check return air temp Normal suction is 50 60 psig Check flow with flowmeter or other method Add refrigerant slowly Check for possible leaks Check water pump operation Reversing valve stuck in the heating mode Unit works well in the heating mode but there is no loud rush ing sound when unit is quickly switched to cooling mode Check or replace valve sole noid and if necessary replace entire reversing valve assem bly Maritim
17. will not freeze during operation in the winter months This antifreeze is required because the loop fluid will normally reach a low entering temperature of 28 F to 32 F and refrigerant tem peratures inside the heat pump s heat exchanger may be as low as 20 F cooler See the antifreeze concentration chart at left for details of freeze protection afforded under different concentrations NOTE Add enough antifreeze to allow for a tem perature 20 F lower than the expected lowest loop fluid temperature entering the heat pump NOTE Although many different antifreeze solutions have been employed in geothermal systems the alcohols such as methanol or ethanol have the most desirable characteristics for earthloop application The overall heat transfer character istics of these fluids remain high although care must be taken when handling pure alcohols since they are extremely flam mable Once mixed in a typical 2596 by volume ratio with wa ter the solution is not flammable In situations where alcohols are not allowed as a loop fluid due to local regulations then propylene glycol is a non toxic alternative which can be sub stituted Propylene glycol should only be used in cases where alcohols are not permitted since the heat transfer characteris tics are less desirable and it becomes more viscous at low temperatures which increases pumping watts The volume of fluid that your loop system holds can be closely estimated by totaling the number of
18. 0 standards amp CAN CSA C446 M94 Page 22 Maritime Geothermal Ltd Feb 00 Capacity Data Heating Mode Model RH 48 HAC Nominal 4 ton Comp otal Watts Watts 4686 5245 4593 5154 4485 5045 4271 4830 4188 4747 4095 4655 4051 4610 3982 4540 3894 3 4454 3865 4423 3811 4367 3748 4307 3738 4294 3689 4243 3601 4157 3689 4243 3680 4235 3636 4191 3582 4136 32541 45697 Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB CFM 1850 External static 15 in wc RH 48 HAC Cooling Mode Total Sens Latent Comp A CO gt 77 36 2 91 0 13 8 52035 3 38 80 4 58 3 22 1 34326 18545 53513 17 8 3831 5 32 537 4368 12 3 11 8 Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 15 in wc 1850 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 Page 23 Feb 00 Maritime Geothermal Ltd Capacity Data Heating Mode Model RH 60 HAC Nominal 5 ton Comp otal Watts Watts 4986 5577
19. 1 60 Entering air 70DB 60 WB CFM 1120 External static 15 in wc RH 30 HAC Cooling Mode Total Sens Latent Comp A CO MO E 77 35 6 88 1 11 3 42842 3 38 79 5 50 1 29 4 30447 11781 44167 11 8 2655 2 13 359 3014 6 14 7 Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 15 in wc 1120 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 Page 20 Maritime Geothermal Ltd Feb 00 Capacity Data Heating Mode Model RH 36 HAC Nominal 3 ton Comp otal Watts Watts 3077 3467 3016 3407 3051 3441 2940 3330 2970 3360 2997 3388 2804 3194 2829 3217 2851 3241 2670 3058 2691 3077 2709 3099 2540 2926 2556 2941 2571 2957 2412 2799 2426 2812 2437 2822 2446 2831 22822 33096 Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB CFM 1475 External static 15 in wc RH 36 HAC Cooling Mode Water Pres Latent A CO MO gt A 3514 5 13 3 12 8
20. 4887 5479 4931 5522 4750 5340 4787 5378 4820 5413 4519 5109 4549 5138 4575 5166 4293 4882 4317 4905 4338 i 4929 4074 4661 4093 4679 4109 i 4696 3862 3 4449 3877 4464 3888 4474 3896 5 4482 34206 50648 Closed loop penalty Operational figures below obtained with a 15 solution of methanol amp water Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB CFM 2300 External static 20 in wc 60 Cooling Mode Total Sens Latent Comp 22067 63600 23171 66780 24213 69786 21405 61692 22476 64777 23487 67692 20763 59842 21801 62834 22782 65661 20140 58046 21147 60949 77 35 6 93 6 16 8 58296 3 4 79 5 59 2 20 3 40832 22099 63691 27 5 4233 3 5 586 4819 13 2 12 8 Rating conditions Voltage 230 1 60 Entering air 80DB 67 WB External static 20 in wc 2300 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 o 5 o o 5j o o 5 o o Page 24 Maritime Geothermal Ltd Feb 00 NORDIC RH Series Trouble Shooting Guide Compressor not operating Possible Cause Power Failu
21. 91 154 1291 2 88 2 80 32 6 27 1 29 6 2 38 8577 5 21 69 6 93 7 24 1 12963 4 6 1133 0 90 152 1285 2 96 2 82 32 4 18 1 28 5 3 48 8362 2 88 70 5 94 2 23 7 12739 4 5 1129 0 91 154 1282 2 91 2 79 2 6 4 30 Rating conditions Voltage 230 1 60 Entering air 70DB 60 WB 500 External static 1 in wc RH 13 HAC Cooling Mode Total Sens Latent Comp AINI DO AIN MD BR Po O AJN 77 27 6 83 4 6 65 19227 2 09 79 5 53 2 26 3 12488 7132 19822 6 0 1340 0 93 157 1497 13 2 Rating conditions Voltage 230 1 60 Entering air 800 67 WB External static 1 in wc 500 CFM In accordance with ARI 325 and 330 standards amp CAN CSA C446 M94 Page 17 Feb 00 Maritime Geothermal Ltd Capacity Data Heating Mode Model RH 19 HAC Nominal 1 5 ton Comp otal Watts Watts 1654 1843 1621 x 1810 1644 1835 1721 1908 1737 5 1926 1752 1939 1769 1958 1780 d 1967 1789 1977 1801 1986 1807 1996 1812 1998 1819 2004 1821 2005 1822 2008 1825 3 2012 1824 2009 1821 5 2007 1818 2002 PO HID P AIDIN Closed loop penalty Operational figures below obtained with a 15
22. C heat pump from a water well provision must be made for an adequate water supply since in essence water is the fuel for the unit It is imperative that the flow requirements listed in the engineering section be closely adhered to Plumbing lines both supply and discharge must be of adequate size to handle the water flow necessary for the heat pump For distances less than 40 ft from the pressure tank 3 4 copper or plastic lines should be run while for longer dis tances we recommend that 1 plastic or copper lines should be run to the heat exchanger Similarly a 1 line should be run from the discharge pipe to the method if disposal Ideally there will be water flow available in excess of the requirement of the heat pump In such a situation the proper pump can be selected from the manufacturer s pump chart to maintain a pressure of 30 to 40 psig on the lines when the heat pump is operating However in some cases a well can supply a heat pump only if In to Heat Pump the minimum re quirement for water fi Brass fitting on is used Water flow water lines to heat Pump to the heat pump can be controlled very accurately by the installation of a reverse action pres sure valve in the discharge line of the unit Another method of regulat 1 Water IN 1 8 D stem Thermome amp ters amp Pressure gauges Ae the aN is by attached through P T n e use ol a port DOL
23. Comp Locked Rotor Amps LRA 43 0 52 0 60 0 79 98 107 116 141 Minimum circuit ampacity 10 13 15 20 22 25 31 35 Maximum Fuse Size 15 20 20 30 30 40 50 60 Maximum Circuit Breaker 15 20 20 30 30 40 50 60 Electrical characteristics above for 208 230 1 60 Call for 3 phase specifications CFM Available VS External Static Pressure Motor tap set at High Speed Model 41 H20 ESP RH 13 G7 5 500 RH 19 G9 5 730 RH 24 G7 RH 30 GT9 RH 36 G9 7 RH 42 G9 8 RH 48 G9 RH 60 G10 8 Page 16 Maritime Geothermal Ltd Feb 00 Capacity Data Heating Mode Model RH 13 HAC Nominal 1 ton Pres Btu s Comp Comp Fan Fan Total CSA EWT igpm Lpm LWT Diff HAB Drop EAT LAT Diff Out Amps Watts Amps Watts Watts COP COP 70 6 2712 654 44 15818 324 70 107 37 6 20255 6 0 1060 0 95 160 1220 487 4 35 70 4 18 08 63 3 65 15502 1 35 70 107 36 9 19850 5 9 1038 0 95 160 1199 486 4 52 70 2 9 04 57 1 125 15037 09 70 106 36 1 19453 5 9 1055 0 96 162 1217 469 4 53 65 6 2712 61 1 40 14426 327 70 105 354 19064 58 1107 0 94 159 1266 4 42 3 90 65 4 18 08 59 1 58 13993 1 94 69 104 347
24. E valve This valve will automatically con trol the amount of water flowing through it by varying the diameter of a flexible rubber orifice through which the water passes If either of such valves is needed they can be supplied Maritime Geothermal Ltd and installed by your dealer All water line valves on both the supply and discharge lines should be BALL valves since a GLOBE valve will cre ate too much restriction across the line possibly causing the heat pump to trip out on it s low pressure safety cutout control as a result of insufficient water flow Install a P T Pete s Plug plug on the Water IN and Water OUT lines just outside the heat pump so that it is easy to record the water in and out temperatures and pressures ac curately Exposed water lines will have a tendency to sweat when the heat pump is in operation therefore it is recommended that both the water supply and discharge lines be insulated with suitable insulation Hot Water Connections If you have ordered the unit with the suffix on the nameplate the unit will be equipped with a separate heat exchanger and circulator pump specifically engineered to produce domestic hot water for use throughout the building Connection to the hot water generator feature of the heat pump is accomplished by teeing into an electric or oil fired hot water tank with a capacity of 40 gal minimum A typical piping diagram is shown elsewhere in th
25. Seized compressor due to locked or damaged mechanism Compressor attempts to start but trips it s internal overload after a few seconds Attempt to rock compressor free If normal operation can not be established replace compressor Faulty run capacitor Check with ohmmeter for shorts open etc Replace if faulty Page 25 Feb 00 Compressor not operating Compressor short cycles Unit trips off on LOW suction pressure control Low or air conditioning Possible Cause Open control circuit Verification Thermostat not calling for heat High or low pressure limit open Lock out relay energized Maritime Geothermal Ltd Recommended Action Locate open control and deter mine cause Replace faulty control if necessary Compressor repeatedly locks out on it s LOW pressure safety control Intermittent contact in electrical control circuit Low water flow Open contacts on low pressure safety limit switch Lock out relay energized Water heat exchanger frozen Normal operation except too frequent starting and stopping Manually open water valve and measure water flow with a flowmeter Check for low or no wa ter Restore proper water flow Thaw out heat exchanger Check anticipator in thermo stat Make sure setting is for longest cycle or max amps Check well pump for proper operation Check water
26. being pumped through the unit is of a poor quality or you notice a decrease in performance after several years of use it may be necessary to have the liquid heat exchanger cleaned Feb 00 Maritime Geothermal Ltd Diagram A Possible earthloop configurations Type 3408 High Density PE tubing xen Design 2 Design 1 Parallel piping Reverse Return Header System Series piping 1 or 2 pipes per trench Diagram A Shown above are several of the many possible horizontal loop layouts which have been successfully employed in vari ous types of ground conditions Design 1 Shown is a typical reverse return header system and 2 parallel loops On a 2 ton system each of these loops would be 500 ft long with 4 ft spacing between the U sections 10 ft spacing between the loops and buried 6 ft underground Design 2 is a single loop of 1 1 4 to 1 1 2 diameter pipe with a length of 500 ft x the tonnage of the system and buried to a depth of 6 ft underground Individual runs of pipe should be kept a minimum of 10 ft apart Diagram B Design 3 Design 4 l il 10 ft min i Vertical Parallel Vertical Series Design 3 Shown is a vertical borehole reverse return header system Vertical systems generally require 125 to 175 ft of borehole per ton of heat pump for successful heat transfer to take place with the earth Boreholes should be spaced a minimum of 10 ft apart while if la
27. commonly found in commercial buildings and schools Hanger brackets are available so that a standard threaded rod type suspension system can easily be employed Adequate care should be taken to ensure that there is ample room around the unit so that ser vicing can easily be carried out on the unit if required If the heat pumps are to be installed in a mechanical room they can be stacked up to 3 units high without requiring a rack system Fire retardant acoustic in sulation should be installed between each unit to limit the transmission of vibra tion and operational noise between units The RH Series NORDIC heat pump has an air filter rack which can be removed for easy entry through a doorway or to facilitate moving the unit with a furniture cart Simply remove the two screws which hold the end cap in place slide the cap off and push the rack back off it s rails When the heat pump is in place the filter rack can be reinstalled with the re movable end where the filter is accessed facing the direction that allows easiest access for changing the filter To achieve the greatest efficiency the heat pump should be centrally located with respect to the the conditioned space This design provides the utmost in economy and comfort and usually can be accomplished in harmony with the design of the building All ductwork must be thermally and acoustically insulated A heating cooling system cannot be expected to produce an even temperatu
28. ctors in a length of 18 4 thermostat wire Connect and 1 in the control section of the heat pump s electrical box to T 1 terminal strip in the plenum heater as shown 3 Using the remaining 2 conductors con nect and F in the heat pump s electrical box to F and F in the ple num heater 18 4 wire Y CGY FF e e e cje 3 Thermostat Operation el e e e e The NORDIC heat pump comes sup ve cy plied with a 2 stage heating 1 stage cool ing auto change over digital thermostat The heat pump is already prewired for this stat and requires only the connections mentioned above for full operation The thermostat operates the heat pump as 1 E the first stage of heat bringing the electric 1 5 backup on only if required There is a 2 differential between the first and second stage of heat The thermostat automatically changes between heating and cooling as re quired by the building 000 Page 30 Maritime Geothermal Ltd
29. drilling a small Page hole the PIT Plugs turn Pete s Plug ple ap Protective Cover Included proximately 2 ft from the filter rack and inserting the ther mometer s sensing device 17 Similarly record the discharge air temp There should be a rise across the air exchanger of from 25 to 35 F 18 At the electrical disconnect switch place the am probe jaws around the supply wires and record the current in each 19 Place the thermostat function selector in the COOL position and turn down the stat to a temperature that will cause the air conditioning to begin When the thermostat se lector switch is set in the COOL mode the reversing valve will be energized The blower should start followed by the compressor The outlet temperature will be approx 10 to 20 F cooler than the return air temp General Maintenance As with any piece of equipment there will eventually be some maintenance to be done on the heat pump Several areas will need attention and they are as follows 1 Change the air filter when required 2 On an open well system clean the groundwater heat exchanger if required 3 Insure the condensate drain is clean Reversible NORDIC heat pumps are equipped with coaxial type heat exchangers These heat exchangers are not manually cleanable however they can be acid cleaned with a sulfamic acid solution commonly marketed under the trade Iron Out If you suspect that the water
30. e Geothermal Ltd Possible Cause Verification Feb 00 Recommended Action Low or no air conditioning Open control circuit Thermostat not set to signal operation Turn room thermostat down Reduced air flow or re turn air temperature too cold Unit trips out on low suction pressure control Check for 1 Dirty air filter 2 Fan belt slipping 3 Broken blower belt 4 Inoperative blower motor 1 Replace filter 2 Tighten blower belt 3 Replace belt 4 Replace blower motor Insufficient hot water Circulator pump not op erating Visually inspect the pump to see if shaft is turning Use an amprobe to measure current draw Replace if faulty Blockage or restriction in the water line or hot water heat exchanger Check water flow and power to pump Check water lines for obstruction Remove obstruction in water lines Acid treat the domestic hot water coil Thermostat limit is open Check contact operation Should close at 120 F and open at 140 Replace thermostat if faulty Disconnect switch open or fuse blown in electri cal supply to hot water tank Check both line and load sides of fuses If switch is open de termine why Replace blown fuse or breaker or close switch Reset button tripped on hot water tank Check voltage at elements with multimeter Push reset button Thermostat on hot water tank set too low S
31. freeze then this method of disposal works well Safety Controls The NORDIC heat pump has two built in safety controls which are designed to protect the unit from situations which could damage it A LOW PRESSURE TEMPERATURE CON TROL The low refrigerant pressure temperature control is designed to shut the unit down if the refrigerant evaporating pressure becomes too low thus risking the danger of freezing conditions in the evaporator There are only 4 reasons why this control would activate and they are 1 Low water flow See requirements for each model 2 Low water temperature Below 40 F 3 Dirty or fouled heat exchanger 4 Low refrigerant charge B HIGH PRESSURE CONTROL The second safety control is a high pressure safety limit which monitors compressor discharge pressure This device will not normally trip unless there is an interruption in air flow Such a situation could occur if the blower motor or fan belt failed or if the heat pump had an extremely dirty air filter If either of these controls trips it will activate a LOCK OUT RELAY which prevents the unit from restart ing until power to the control circuit is broken by turning the thermostat to the OFF position and then back on again or the electrical supply to the unit is broken by opening the heat pump breaker and then closing it again If one of these con trols trips there is a serious problem with the system and it must be rectified if the unit i
32. g Use an 18 8 conductor cable Connect C G Y Y R L W Wi O W in terminal box to the correspond ing letters on the thermostat supplied C common G blower relay Y Y2 compressor R 24v hot supply L compressor lock out light O W2 reversing valve F F D Plenum Heater Fan Control I see next page for instructions 1 Plenum Heater Switch Optional Hot Water Circulator Special Instructions Note If heat pump is to be operated without the hot water circulator con nected to the water tank and flooded with water remove the wire marked with RED tape located here This pump is water lubricated and must not be run dry 230 115v 1 60 connections Wire to lugs on compressor relay e Connect L3 to Black e Connect L2 to White neutral e Connect L1 to Red e Connect GND to GND lug 15 KW Model Minimum Circuit Ampacity Recommended Wire Size TD Fuse or Breaker Thermostat Wire Plenum Heater 230 1 60 RH 42 25 8 3 40 18 8 61 5 Amps RH 48 31 8 3 50 18 8 230 v AC RH 60 35 6 3 Page 60 29 18 8 Feb 00 Maritime Geothermal Ltd NORDIC Thermolec Plenum Heater Connections Electrical Connection to a NORDIC Heat Pump 1 Connect the proper electrical supply with a suitable breaker to the main ter Thermolec 15 Kw Heater minal block shown A at left 2 Using 2 condu
33. g level so that condensate water will not overflow the catch pan 9 Make sure the proper time delay fuse has been in stalled in the fuse box 10 Have the following tools on hand and know how to use them refrigeration gauge set An electronic or other accurate thermometer water flow meter 11 Connect your refrigeration gauge set 12 After the 4 hour warm up period place the thermo stat function switch in the HEAT position turn up the thermo stat The compressor blower and hot water circulator will start NOTE If the unit is equipped with an electric TACO water valve the blower will start first followed by the com pressor in 30 to 60 seconds When the TACO water valve is fully open an internal switch activates the compressor circuit 13 Observe the readings on the high and low pressure gauge set When the home reaches a temperature of 65 to 70 F the suction pressure blue gauge should be approxi mately 53 to 58 psig while the head or discharge pressure red gauge should be in the area of 225 to 275 psig Record this information on the warranty test card 14 Using an electronic thermometer or other accurate thermometer record the supply water temp IN and the wa ter temperature OUT The outlet water temperature should be from 4 to 7 F cooler than the inlet water temperature 15 Record the supply water flow in gpm 16 Record the return air temperature by
34. hould be set at 120 F Visually inspect the setting Readjust the setting to 120 F Heat pump not running enough hours to make sufficient hot water Note the amount of time the heat pump runs in any given hour Temporarily turn up the tank thermostats until colder weather creates longer run cy cles In line Flowmeter Digital Thermometer Dole flow control Valve The Dole flow control is a simple self cleaning device designed to deliver a con stant volume of water from any outlet whether the pressure is 15 psig or as high as 125 psig The controlling mechanism con sists of a flexible orifice that varies it s area inversely with pressure so that a constant flow is maintained Page 27 Feb 00 Maritime Geothermal Ltd NORDIC RH Series Schematic Wiring Diagram 230v 1 60 Hot Water generator and associated circulator pump are an optional feature on RH models Look for a W in the model No to determine if your unit has L L Crankcase 3 A 18 Blower Relay Compressor Run Cap Start Cap k Totaline Thermostat Required Connection Y Y2 Room Thermostat Wiring co NOTE To temporarily disconnect circulator pump remove wire marked with red tape from bottom right termi
35. is manual Be sure to note the position of the check valve and the direction of water flow One should be sure the tank is filled with water and is under pressure before activating the heat pump Slightly loosen the copper union on the hot water discharge pipe to allow air to escape from the system before the unit is started This step will make certain that the water circulator is flooded with water when it is started Since the pump is water lubricated damage will occur to the pump if it is run dry for even a short period Maritime Geothermal recommends the installation of a hose bib on the hot water output line to facilitate the easy removal of air from the desuperheater lines once the plumbing has been installed The hose bib on the discharge water line may have to be purged of air several times before good circu lation is obtained A hand placed several feet down the line will sense when the water is flowing The thermostats on the hot water tank should be set to 120 F since the heat pump has an internal thermostat set at a low of 130 F By setting the tank thermostats as described the heat pump will try to keep the tank above the cut in point of the electric element settings thus generating hot water from the heat pump only During summer or periods of high de mand the electric elements will energize to help make hot water NOTE If 2 shut off valves are located on the hot wa ter lines as shown in the diagram be sure that
36. nal on compressor relay Marked A on diagram at left Taco Valve Comp relay coil Lock out relay 3 44 i 2 2 Low Pres High Pres A 2 is Electric Heat Relay SPDT e Electric Heat Relay Coil e Reversing Valve Coil Page 28 Plenum Heater Operation A SPST switch across FF activates the fan relay amp 1 provides a set of dry contacts for operating plenum heater Maritime Geothermal Ltd Feb 00 NORDIC RH Series Electrical Box Connections Thermostat connections 8 Fiel WO ES CGYzRLWiWe F F I 1 T stat SARE olo Wiring elele e Ki o ka KS 1 2 2 Start cap I I FRAN Lock out Plenum Relay Heater EED 120 24v Zeenen 1 Run KA cap m vi wl 2 e 3 mmm s 1 2 pen pm d Blower relay SE Field Wiring LJ JO L1 r Gnd EE d Compressor relay Gnd lug Heat Pump Electrical Service Requirements 230v Ph 60Hz Electrical Box Block Wiring Diagram Field Wiring Low Voltage 24v Wirin
37. nd is available 15 ft spacing will produce better results Boreholes should be tremie grouted from bottom to top with bentonite or a mixture of bentonite and neat cement for proper con duction with the earth Design 4 Shown here is a typical series loop design using 1 1 4 to 1 1 2 pipe for the loops Some designs incorporate a double U tube assembly down the well which allows for better heat transfer between the earth and the loop NOTE Many other loop designs are in common use throughout North America For a more comprehensive manual on earthloop design refer to our Earthloop Design Manual or contact IGSHPA International Ground Source Heat Pump Association and request their earth systems dealer training manual Page 8 Maritime Geothermal Ltd Feb 00 RH Series Closed Loop Installation Information Introduction Many commercial buildings select a vertical or horizon tal closed loop as the earth heat exchanger either because of a lack of available groundwater or for the reduced maintenance costs which can be obtained when compared to open loop sys tems Often the problems which occur in a geothermal sys tem are associated with the the wells pumps or the direct re sult of utilizing poor quality water or water which is contami nated with sand or other foreign materials Such contamina tion can cause premature failure with pumps water valves heat exchangers and return wells To reduce these problems
38. nections are permanently installed The ball valves on the flush cart lines can be used for manually purging small quantities of air from the system Legend 12 3 4 Galv nipple NOTE Several other small plumbing fittings 1 3 4 copper T 13 1 1 4 x 1 1 4 x 3 4 Galv T may also be required to adapt the 1a 3 4 Type L copper pipe 14 1 1 4 FPT Full port ball valve thermometers pressure gauges etc to the 1 2 3 4 copper union 15 Taco 011 or Grundfoss amp UP 26 99 pump 1 4 lines 3 3 4 to 1 1 4 Copper to Female adapter 16 1 Barbed adaptor to 1 MPT 4 1 1 4 galvanized nipple or threaded pipe 17 1 FPT Full port ball valve The above technique could 5 1 1 4 Galvanized 90 elbow 18 1 Galv nipple or threaded pipe also be employed using 6 20 C ta 60 C thermometer 3 4 MPT 19 1 1 4 x 1 1 4 x 1 Galv T PVC elbows fittings etc 7T 1 1 4 x 1 1 4 x 1 2 Galv T 20 2 Gal expansion tank amp Automatic air vent 1 4 MPT 21 0 to 30 Psig guage 1 4 MPT 9 3 4 x 1 4 reducing bushing 22 1 1 4 PE 3408 to Brass MPT transition adapter 10 75 Psig pressure relief valve 3 4 MPT 23 1 1 4 PE 3408 90 elbow 11 3 4 Galv T 24 1 1 4 PE 3408 Plastic earthloop pipe D Open Well amp Hot Water Tank Plumbing Diagram Cold Supply IN Hot Water out NORDIC RH 13 to 60 Hot Water lines are 5 8 OD copper Cold lines 3 4 to 1 ID Insulate both hot and cold water lines Use only ball or gate valve
39. of the U tube with tape to add weight to the assembly and also prevent it from curling up and gouging into the side of the borehole during insertion The entire length of the assembly should be taped every 10 ft to create greater rigidity in the U tube assembly as it is installed in the bore hole The U tube is inserted into the borehole and the bore hole is tremie grouted from bottom to within 10 ft of the top with a mixture of neat cement and bentonite or 100 ben Feb 00 Maritime Geothermal Ltd trench length N 50 ft One Example of Piping Layout for Horizontal Closed Loop Heat Pump System ton system shown Duct Supply Return 40 ft BUILDING Page 10 e Type 3408 PE tubing e Excavated trenches minimum 4 wide x 6 deep Note Trenches will be backfiled with material which will maximize the thermal conductivity of the adjacent earth e Each loop consists of 500 ft of 3 4 type 3408 PE 160 psig SDR 11 geothermal heat pump polyethelene tubing e Alow a minimum of 10 ft between each trench and preferably 15 20 ft if space is available m ca 3 4 T s S WEE Header SS Detail 1 1 4 Header Lu Pipe Insulate all tubing within 12 of the
40. one of the following with their return or waste water A Run it into a drain or ditch B Pond river or stream C Leaching field In most instances if you run the water right out on top of the ground it will soak back into the ground in less than 50 ft of travel If suitable care 1s taken to insure that the drain pipe runs downhill and the end of the pipe is protected by a bale of hay or spruce bows etc the end of the pipe will not freeze When snow comes it will usually cover the entire process much like a small spring The above information is intended to give the prospec tive user purchaser some insight as to the general require ments for a successful application of the NORDIC heat Feb 00 pump Unpacking When the heat pump reaches it s destination it should be unpacked to determine if any damage has occurred during shipment Any visible damage should be noted on the carrier s freight bill and a suitable claim filed at once The heat pump is well constructed and every effort has been made to insure that it will arrive intact however it is in the customer s best interest to examine the unit thoroughly when it arrives If the heat pump is to be stored on site for an extended period of time leave the shipping carton in place and store in a safe dry location Optimum Placement RH Series heat pumps have been designed for applica tions where it is desired to place the units above a false ceil ing enclosure such as is
41. or oil when the compres sor is unheated A crankcase heater is standard equipment on your heat pump and it will warm the compressor dispelling the liquid refrigerant Compressor damage can occur if the heat pump has been brought in from a cold location and im mediately started up 4 Turn on the water supply and check all plumbing for leaks 5 Check the hot water tank to be sure it is filled with water before energizing the circuit NOTE In a low ambient air start up the hot water tank should be energized for at least 4 hours before the heat pump is started A combination of low air temperature and 45 F water in the hot water tank can sometimes cause the unit to shut down on it s low pressure control If this happens close ONE valve in the hot water circuit to temporarily shut off the flow to the hot water generator Do not shut off both valves since water expanding in the hot water generator loop may cause damage to the circulator pump housing When the home has come up to temperature open the valve for normal hot wa ter operation Slightly open the union or hose bib on the hot water discharge pipe to make sure that all air is out of the sys tem and the circulator pump is flooded with water 6 Make sure the air filter is clean and in place 7 Vacuum out any dust and debris that may have col lected in the unit during installation Check the condensate drain to be sure that it is free of obstruction 8 Make sure the unit is sittin
42. ors such as type of ground moisture content and configuration of loops desired It is often possible to shorten loop lengths and resulting costs when using some of the newer Slinky designs of earth loops A comprehensive manual dedicated entirely to the in stallation of Groundloops is available from Maritime Geother mal Ltd which describes in detail the techniques involved in installing a closed loop system Vertical Groundloops Vertical groundloop systems are generally the system of choice for commercial and institutional buildings since the land area available is often limited to parking lots with some adjacent landscaped areas Boreholes of 4 to 6 in diameter are drilled with conven tional drilling equipment usually to a depth of less than 300 ft Each ton of heat pump installed requires approximately 150 ft of borehole The 3 4 to l plastic pipe U tubes are fused together using socket fusion techniques and then pressure tested for leaks at 100 psig using either water or air Provi sion should be made to allow enough extra pipe to extend from the boreholes to the proposed location of the header sys tem Prior to inserting down the hole the assembly must be filled with water so that buoyancy will be at a minimum when inserting the U tube Cap the ends so that mud and debris cannot enter the loops during insertion and grouting A piece of heavy rebar or galvanized pipe is attached to the bot tom 10 to 15 ft
43. pe being kinked through compaction of the earth under the pipe after the trench is backfilled Fuse the individual smaller loops to the main header loops and extend these into the home by drilling through the concrete wall or by rising up the outside of the basement wall or slab and entering the structural part of the home or building above grade Any piping that comes within 10 ft of the structure should be insulated with 3 8 to 1 2 closed cell armaflex insulation to prevent freezing from oc curring near any structural part of the building Likewise all piping inside the building must be insulated to prevent con densation and subsequent dripping onto floors or walls Circulator Pump Module When the groundloop has been brought inside the home or building to the location of the heat pump it must be con nected to the pump module which generally consists of 1 Grundfoss Model UPS 26 99 or Taco Model 0011 pump for systems up to 3 ton and 2 pumps for systems up to 5 ton These units must be able to pump at least 2 5 to 3 USgpm per ton of heat pump for proper operation of the system To cal culate the size of pumps required use the pressure drop tables for the diameter and type of tubing used along with all el bows T s etc and the pressure drop through the unit s heat exchanger to arrive at total ft of head x 3 gpm ton x No of tons Heat Pump to Circulator Piping The heat pump must be connected to the circulator p
44. r from normal design in the number of leads and size of main trunks required Air temperature leaving the heat pump is normally 95 to 105 F much cooler than that of a conven tional warm air furnace To compensate for this larger vol umes of lower temperature air must be moved and conse quently duct sizing must be able to accommodate the greater air flow without creating a higher static pressure or high ve locity at the floor diffusers Maritime Geothermal Ltd recom mendis that the external static pressure ESP be kept be low 20 inches of water total Return ducts should ideally be placed in every room and be sized 50 larger than corre sponding supplies In some instances the number of floor dif fusers will actually double when compared to the number that would normally be used for a warm air oil fired furnace NOTE See the duct sizing chart in the engineering sec tion of this manual Starting the Heat Pump BEFORE starting the heat pump the following areas should be rechecked to assure proper operation 1 Check all high voltage field wiring and electrical con nections inside the control box for good connection 2 Check all low voltage thermostat to make sure they are connected properly Place thermostat HEAT OFF COOL switch in the OFF position 3 Turn on the main power switch Allow the power to remain ON without starting the unit for a period of 4 hours Maritime Geothermal Ltd Refrigerant migrates to the compress
45. re Verification Electric circuit test shows no voltage on the line side of compressor contactor Recommended Action Check for blown fuse at heat pump s disconnect box or blown fuse Disconnect switch open Voltmeter shows no voltage on the line side of the compressor contactor Determine why the disconnect switch was opened if all is OK close the switch At heat pump disconnect box voltmeter shows voltage on the line side but not on the load side Replace fuse with proper size and type Time delay type Check total load on system Low voltage Voltmeter shows abnormally low voltage Below 210 v at heat pump disconnect switch Call power company Burned out motor Ohmmeter shows no resistance between common and run ter minals or between common and start terminals Note Be sure compressor overload has had a chance to reset If comp is hot this may take several hours Determine cause and replace motor Thermal overload on compressor tripped Ohmmeter shows reading when placed across R and S terminals and infinity between C amp RorC amp sS Make sure the internal over load has had time to reset If windings are open or over load is faulty replace com pressor Faulty compressor con tactor Voltage on line side with con tactor held closed but no volt age on one or both terminals on the load side Points pitted or burned Replace contactor
46. re throughout a conditioned space when it is located at one end of the structure and the condi tioned air is transmitted with uninsulated metal ductwork If possible the four main service doors should remain clear of obstruction for a distance of 2 two ft so that servic ing and general maintenance can be carried out with a mini Hanger brackets are available which attach to the corner of the heat pump for suspension from ceilings Page Maritime Geothermal Ltd mum of difficulty In mechanical room installations raising the heat pump off the floor a few inches is generally a good practice since this will prevent unnecessary rusting of the bot tom panel of the unit For mechanical room installations we recommend that the heat pump be placed on a piece of 2 Styrofoam covered with 1 4 plywood The Styrofoam will smooth out any ir regularities in the cement floor while the plywood will distrib ute the weight of the NORDIC unit evenly over the Styro foam This process will also deaden the compressor noise emitted from the bottom of the cabinet Units installed in an overhead area should be placed in a secondary drain pan on a suitably insulated base to prevent the possibility of condensate overflowing and causing dam age to a ceiling etc The drain pan and associated drains should be inspected once per year to be sure they are clear of obstructions and operating properly Water Well Plumbing If operating the NORDI
47. s Set tank hot water thermostat to 120 F Use flexible duct collars on both the supply and Return Air return to eliminate vibration amp noise Install 125 Psig Pressure relief valve at A Remove drain in tank and install T as shown at 1 e 4 1 below Check Vale 40000 l Supply Air a Air Bladder Tank 5 8 OD Hot Water Lines Insulate with 3 8 wall armaflex insulation RH Series Heat Pump Optional Dole flow restrictor Optional 50 Micron To return well pond etc Strainer or back to groundloop Page 14 Maritime Geothermal Ltd Feb 00 NORDIC Series RH Horizontal SSS 1 SS _ PO Po Po December 1997 Page 15 Feb 00 NORDIC External Wiring Disconnect Thermostat Switch Legend 1 Thermostat Entry 3 8 pnmum 2 Auxilliary Electrical Access 7 8 3 Main Electrical Access 1 Geothermal Heat Pumps Maritime Geothermal Ltd Model RH13 RH19 RH24 RH30 RH36 RH42 RH48 RH60 Nominal BTU output 13 500 20 000 25 000 32 500 37 000 43 000 50 000 62 500 Blower Horse Power 1 6 1 6 1 3 1 3 1 2 1 2 3 4 3 4 Blower Full Load Amps 1 3 1 3 1 8 1 8 2 6 2 6 4 4 Comp Rated Load Amps RLA 6 3 9 2 10 4 13 5 15 4 17 1 21 5 24 8
48. s to maintain good service Page Maritime Geothermal Ltd NOTE Under no circumstances should the heat pump lock out relay be reset more than twice in an hour If the the heat pump is shutting off because of LOW or NO water flow then repeated resetting of the unit could cause the heat ex changer to freeze and rupture destroying the heat pump Electrical Nordic R Models The NORDIC unit is supplied with an opening for 3 4 conduit nipple on the front side of the unit An additional knockout 1 2 is provided to facilitate connection of a ple num heater blower control wire if required Above this is an other 3 8 hole for the thermostat wire wiring diagram is located inside the electrical box cover for quick reference and although the connections to be made are quite simple Mari time Geothermal Ltd recommends that a properly qualified electrician be retained to make the connections and wire the thermostat Unless specifically deleted e g for a building manage ment system the NORDIC unit comes supplied with a ther mostat and connections are clearly marked on the control box Using a 8 conductor 18 gauge wire suitable for the job con nect the terminals in the heat pump electrical box to the corre sponding terminals on the thermostat An additional 4 conductor wire will be required for low voltage control of a NORDIC plenum heater if required Ductwork Ductwork layout for a NORDIC heat pump will dif fe
49. structure with 3 4 closed cell armaflex insulation Piping that is laid in a header trench should be insulated to a point where each loop branches to it s individual trench Loop 4 shown above could be left uninsulated to pick up heat in the header trench as long as the header trench is more than 12 out from the building Manifolding can also be done outside the building using suitable fusion joining techniques Maritime Geothermal Ltd tonite When using bentonite refer to the manufacturers in structions for mixing and select a product that provides a total solids content of from 25 to 30 when mixed Horizontal trenches from 4 to 6 ft deep are dug along side the boreholes to the building so that a reverse return first pipe out on the supply line is the last pipe back on the return line header pipe arrangement can be constructed to tie all the loops together Lay out the header system so that air cannot be easily trapped in the header using a technique approved by Table 1 Antifreeze Percentages by Volume Protection down to Methanol Propylene Glycol igshpa or the local governing authority Use a shovel to break away any ground between the trench and the boreholes and dig a relief no less than 30 times the diameter of the pipe to allow the pipe to bend to the header pipe without kinking Be very careful not to disturb the original ground under the relief so that you do not have to worry about the pi
50. t fails to conform to this warranty 2 The customer returns such part or component to MARITIME GEOTHERMAL LTD transportation charges prepaid within 30 thirty days of failure and 3 MARITIME GEO THERMAL LTD s examination of such component shall disclose to it s sat Page 32
51. t fused together into one contiguous unit using a technique developed by the gas industry A heater tool with the appropriate faces heats both the pipe and fitting for a prescribed period of time and then the two pieces are quickly removed from the heater inserted together and held in place until the joint cools When properly done the resulting joint is stronger than the original pipe with no chance of leaks or breaks For more information on butt and socket fusion techniques see our website at http www discribe ca nordic fusion htm or request a copy of the Cen Page tral Tools Butt and Socket fusion manual Horizontal Groundloops Horizontal groundloop systems are most commonly used where land is readily available since they are cheaper to construct than their vertical counterparts Although many con figurations are available we have found that a parallel system with one 1 500 ft U pipe per ton placed in a 250 ft x 4 ft wide x 6 ft deep trench is easy to construct and provides am ple ground impact area to adequately supply a 32 F or better Entering Fluid Temperature to the heat pump even in the most severe winter months See opposite Diagram A Several companies including Thermalworks and the International Ground Source Heat Pump Association igshpa provide modeling software to size the heat pump to the home and then size the loop to the demand of the home and heat pump Consideration is given to many fact
52. the valves are open when the heat pump is operating If both valves are closed when the heat pump is operating water will expand in the hot water heat exchanger and could cause damage to the hot water circulator pump Page Feb 00 Condensate Drain You will notice in the piping diagram that there is a small drain pipe to the right of the blower service door back side of heat pump This drain allows the condensed water 3 4 MPT Copper a or PVC adapter Vent if required 3 4 FPT 1 8 per ft 2 Typical Condensate Drain connection d n Air LE 3 1 2 RH Condensate Drain location vapor which forms during the air conditioning cycle to escape to a suitable area of your selection On a very humid day there could be as much as 25 gallons of water formed An inspec tion should be carried out each year prior to the cooling sea son to insure that this pipe is not plugged with dust that has collected during the winter since the water formed will over flow into the bottom of the heat pump This line is not inter nally trapped therefore the installer must construct a suitable trap as shown in the diagram at left Check all drain pans and associated piping to be sure all condensate outlets are opera tional Water Disposal Methods Water disposal methods vary from area to area however some consideration should
53. to a minimum a closed secon dary heat exchange system is constructed with Type 3408 Polyethylene Plastic Pipe specifically engineered for the job Materials such as PVC and polybutylene are not recom mended since their underground joining process is not as reli able as the fusion process used with type 3408 polyethylene The earthloop heat exchanger can consist of a single long length of plastic commonly called a series style heat ex changer or more commonly is found as a number of parallel loops connected to a reverse return header system The se ries system for homes or light commercial applications up to 10 tons normally is constructed with 1 1 4 to 2 diameter pipe while the parallel system uses multiple branch loops from 3 4 to 1 connected to a larger header pipe system of 1 1 4 to 2 diameter The parallel system offers several advan tages such as Lessexpensive pipe Easier to handle the smaller pipe Lower pressure drop Smaller circulator pump s Of course on larger commercial systems it would not be un usual to find header systems with up to 6 diameter pipe for fluid flow into and out of the building Socket Fusion Mechanical joints or metal fittings of any kind are not acceptable underground in an earth loop system due to large temperature fluctuations which may loosen and break clamps and the possibility of eventual corrosion perforation in cou plings and T s Fittings and joints are socket or but
54. turbed Laid in each corner Soil 10 4 10 IMPORTANT NOTES Horizontal style pipe runs should be placed 6 deep x minimum of 48 wide trench as shown above Hand backfilling in the area just over the plastic i e is recommended to prevent crushing or pinching of the pipe during backfilling operations Individual trenches 1 per ton should be spaced a minimum of 10 ft apart to allow the best performance of the groundfield See additional diagrams for pump and piping information bee ee uie Excavated Trench Insulate all inside lines with armaflex 3 8 wall minimum Basement floor Insulate all lines within 10 ft of basement wall with 1 2 armaflex Page 12 Maritime Geothermal Ltd Feb 00 Water Flow Rate vs Pressure Drop Through Heat Exchanger Model 10 usgpm 12 usgpm 14 usgpm RH 13 RH 19 7 1 RH 24 5 2 RH 30 4 8 RH 36 4 8 RH 42 3 7 RH 48 2 4 RH 60 1 8 Nordic amp RH Series removed reverse the flow of water through the lines by inter changing the flush cart lines and purge again You will be able to visibly tell when all air is removed Installing Antifreeze solution In most mid and northern areas of the US and in all of Canada it is necessary to condition the loop fluid by the addi tion of some type of antifreeze solution so that it
55. ump module with a lineset suitable for the flow required with mini mum pressure drop Common line sizes would be 3 4 rubber or plastic for heat pumps from 1 to 2 5 ton while for unit sizes 3 through 5 ton 1 lines should be used The installation of P Feb 00 T plugs pressure temperature pronounced Pete s plugs should be installed on both the entering and leaving lines at the heat pump The P T plug will allow the installer or home owner to check water flow through the loop by measuring the pressure difference through the heat exchanger and comparing this pressure drop to that of the appropriate model in the engi neering section see Pressure Drop vs Water Flow Table Flushing amp Purging the Earthloop Once the earthloop has been installed and all connec tions are completed to the heat pump and pumping station the entire plumbing system should be pressure tested with air to 60 psig to make sure there are no leaks on any of the inside fittings Soap all joints and observe that the pressure remains constant for 1 hour NOTE If you use pressure gauges permanently installed on the system as in the case of a demonstration situation etc be careful not to exceed the maximum pressure rating of the gauges to avoid damage to their mechanism When satisfied all connections are leak free release the air pressure and connect a flush cart see diagram to the flushing access ports at the pump station A temporary flush
56. ve in materials or workmanship Replace ment or repaired parts and components are warranted only for the remaining portion of the original warranty period This warranty is subject to the following conditions 1 The NORDIC heat pump must be properly installed and maintained in accordance with MARITIME Geothermal LTD s installation and mainte nance instruct ions 2 The installer must complete the Installation Data Sheet have it endorsed by the owner and return it to Maritime Geothermal Ltd within 21 days after the installation of the unit 3 It is the responsibility of the building or general contractor to supply temporary heat to the structure prior to occupancy These heat pumps are de signed to provide heat only to the completely finished and insulated structure Start up of the unit shall not be scheduled prior to completion of construction and final duct installation for validation of this warranty 4 It is the customer s responsibility to supply the proper quantity and quality of water If the heat pump manufactured by MARITIME GEOTHERMAL LTD fails to conform to this warranty MARITIME GEOTHERMAL LTD s sole and exclusive liability shall be at it s option to repair or replace any part or component which is returned by the customer during the applicable warranty period set forth above provided that 1 MARITIME Geothermal LTD is promptly notified in writing upon discovery by the customer that such part or componen

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