Hunter UH68ODH User's Manual
Contents
1. 4 QD fitting for fuel overflow 2 2 UH68 ODK ODH Tent Heater Operators Instructions Table 5 Key Function Attachment point for return air duct Storage for stack fuel lines power cord etc Exhaust stack rests on top Holds exhaust stack securely Double wall exhaust stack for extra safety Pop Up Duct Adapter attachment point for supply duct OO RICO ID 2 3 UH68 ODK ODH Tent Heater Operation Under Usual Conditions Setup Alaska Tent TEMPER Tent Completely setup the Alaska tent and deploy the duct collars at the end in which you are to setup the heater Make sure the generator or power supply is on line Before setting up the tent and heater some thought should be given to the orientation of the structures as to the prevailing wind direction Try to orient the heater and shelter so the exhaust is blown down range away from doors and shelter openings CAUTION TWO PERSON LIFT The UH68ODK weighs 130 Lbs Attempting to lift without proper personnel may cause serious injury 1 Move the UH68 ODK into position near the duct collars Set up off ground using skid or similar 2 Open PUDA 1 and remove remote control 2 power cord 3 and inlet adapter 4 3 Attach inlet adapter 4 to heater and attach return duct 5 using band clamp 6 Pay special attention to airflow tag 7 on duct DO NOT PUT RETURN DUCT ON BACKWARDS This will restrict incoming airflow 4 Deploy PUDA 1 by tilting upwards and putting pins 82. CARBON MONOXIDE The heat exchanger must be inspected annually or more frequently if heater usage is heavy A damaged heat exchanger can allow poisonous gases to seep into the heated enclosure causing illness or death to occupants Inspect heat exchanger in accordance with the procedures in TM 5 4520 253 13 1 13 Overheat Safety System The overheat safety switch must be cycled before heater is used after storage or replacement of overheat switch Overheat Testing Start heater and let run for about 10 minutes without the ducts attached Using a piece of paper or similar block the inlet air about three quarters of the way shut At 70 degrees F the heater will shutdown in about a minute Temperature at shutdown should be between 2 5 and 300 degrees F If the overheat safety switch does not work it MUST be replaced Replace thermostat in accordance with procedures in TM 5 4520 253 13 3 105 3 6 UH680DK Tent Heater 3 General UH680DK Tent Heater Chapter 4 Troubleshooting This section contains information for locating and correcting most operating problems This manual can not list all that may occur When performing trouble shooting procedures follow all warnings and safety procedures At no time does this manual supercede good common sense Sequence of Operation 1 2 3 Move main switch to HEAT The green standby LED should illuminate Rotate the room thermo to the nine o clock position or until
3. head SS BLAS er E mS Oe NL ay ee p SFats Check for carbon on bio a GANT LE l ea Li igniter HR Ja ma nny ig rat i O Check carb bowl Look for carbon for water dirt deposits in this area and varnish l J i rt i 3 a LsT i a en ig ane SL a n m hrar rm SZ D ae NNN AAO ams S IA AL Check mixer for l dirt and carbon p deposits UH680DK Tent Heater Cleaning burner head 1 Remove Carb mixer assembly 2 Remove Igniter 3 Clean carbon deposits in this area Use a small wire brush 4 Clean these areas using compressed air CAUTION Wear appropriate eye protection when performing this operation 5 Finish up with solvent wash commonly used in parts cleaning stations or carb cleaner Let dry before assembly tinmumnss a 3 3 UH680DK Tent Heater Cleaning Mixer 1 Remove mixer from carb assembly Caution The mixer assembly is made of brass and can be scratched or dented very easily Great care must be taken not damage the mixer nozzle The performance of your heater depends on this delicate part 2 Soak mixer in solvent bath for an hour or so to loosen up carbon deposits 3 With a flashlight look for dirt or carbon here Dirt may be blown out using compressed air Do not use a pick or any hard tools to clean this area There are two concentric rings here The cent
4. in supports 9 5 Attach supply duct 10 using band clamp 6 Pay special attention to airflow tag 7 6 Pull ducts into tent and point heated air duct away from inlet duct towards center of tent Pull heater away from tent until ducts are straight but not taught 12 2 4 UH68 ODK ODH Tent Heater Operators Instructions 2 5 UH68 ODK ODH Tent Heater 7 Uncoil remote control 2 inside tent and feed through the collar with the return duct 5 Attach remote control 2 to heater Make main sure switch is in the off position 8 Attach power cable 3 to heater then plug in to power supply The green main power LED on the remote panel should illuminate 9 Check fuel in can 14 fill if necessary with authorized fuel see section one Attach Suction Feed Adapter 15 and open vent 16 10 Attach fuel supply line 17 to Suction Feed Adapter 15 Make sure drain cock 18 on supply line 17 is closed Attach supply line 17 to heater QD fitting 19 Move the fuel can 14 as far away from the heater as possible without pulling the fuel supply line 17 taught 11 Attach overflow line 20 NOTE Open end of overflow hose should discharge to a safe outside location along a downslope and below the level of the heater A piece of commercial petroleum absorbent material 21 will be placed under the end of the overflow hose to catch any fuel that may spill 12 Attach exhaust stack cap 22 to stack 23 Slide exhaust stack 22 throu
5. the green HEAT LED illuminates After a five second delay the burner system will come on This includes the ignition transformer fuel pump fuel solenoid and combustion blower The vent fan will come on when the heat exchanger comes up to temperature and the flame switch closes The amount of time will vary 30 to 120 seconds depending on the ambient temperature Once the vent fan comes on the heater will continue to operate until the call for heat from the room thermo is satisfied or the main switch is turned off If the airflow is reduced due to very high back pressure the burner will cycle off from time to time This is normal Blink Code Troubleshooting Buns 00 Ni O O01 amp OO NO Para Problem Remedy 4 Low voltage at AC input lt 100 VAC Check power supply or generator If using an extension cord make sure the wire is heavy enough i Reverse polarity at AC input Check power supply or generator If using an extension cord check connections O High voltage gt 130 VAC Check power supply or generator Not used __ PC Board over temp Not used Not used Ignition Fault Lockout Check fuel supply refill if necessary Check Flame switch Check fuel pump Check fuel flow at carburetor Check Ignition transformer Check Overheat thermo 4 1 UH680DK Tent Heater Note on Blink Codes Only the ignition fault will stop heater operation The other flash codes will be displayed but the heater will
6. to ensure operator s safety when the Space Heater Convective is in operation e DO NOT operate Heater in an enclosed area without proper ventilation e BE ALERT at all times during operating procedures for carbon monoxide poisoning If symptoms are present IMMEDIATELY evacuate personnel to fresh air e BE AWARE the field protection mask used for nuclear biological chemical attack WILL NOT protect you from carbon monoxide poisoning THE BEST DEFENSE AGAINST CARBON MONOXIDE POISONING IS GOOD VENTILATION g ELECTRIC SHOCK Always disconnect power cable from heater before doing any type of service work or repairs SEVERE BURNS HOT EXHAUST DO NOT MOVE THE HEATER ASSEMBLY WHILE ANY OF THE ADVISORY LIGHTS ARE LIT Small portable shelter heaters of this type are not designed to be moved during operation or before purge cycles are complete Serious injury burns or death can occur if the heater assembly is moved while operating the HEAT LED is on or the vent fan is still running During operation some metal components of the heater assembly such as the outlet duct the Pop Up Duct Adapter combustion exhaust pipe etc can cause severe burn injuries if contact with bare skin occurs During heater operation air leaving the HEATED AIR OUTLET of the heater and passing through outlet duct may exceed 220 F Make sure tent personnel are aware of burn hazards and equipment hazards presented by the heated air Combustible mater
7. REV 14MAY02 ENTER Heater Tent Model UH680DK UH680DH Manual for UH68G1 with Hunter Part Number 53100 Outdoor Kit Installed and UH680DH Part Number 168325 Hunter Manufacturing Company 30525 Aurora Rd Solon OH 44139 www huntermfgco com WARNING FUEL WARNING Gasoline and JP 4 should NOT be used with the UH68OKD ODH under any circumstance Only JP 8 or an approved alternate fuel as detailed in Chapter 1 Failure to observe fuel requirements could cause damage to the heater assembly and injury or death to personnel within or around the tent and the heater assembly Always place fuel can in well ventilated area as far away from open flames and other potential ignition sources as possible Fuel spills shall be cleaned up in accordance with local requirements Always switch heater to the OFF position and wait until the vent fan is off before refueling EXPLOSION HAZARD FUEL LEAKS Do not operate heater if fuel leak is detected IN DEATH OR SERIOUS INJURY CARBON MONOXIDE Carbon monoxide is without color or smell but can kill you Breathing carbon monoxide produces symptoms of headache dizziness loss of muscular control a sleepy feeling and coma Brain damage or death can result from heavy exposure Carbon monoxide occurs in the exhaust fumes of fuel burning heaters and internal combustion engines Carbon monoxide can become dangerously concentrated under conditions of no ventilation Precautions must be followed
8. continue to operate Troubleshooting Procedures Electrical Schematic VENT FAN J6 CONN H2 CARB HTR CONN H2 IGNITION J4 O CONN H2 COMB BLR J3 i O O CONN H2 CONN HZONN H2 BRIDGE FLAME SWITCH A 600V Z 4A 600 A BR1 2 N O 125F i e it closes at 125F S Ci BRIDGE 1 5 A 100V MOUSER 511 L4805CV 3 VI VO D6 ZS TVS 18V Cir Brk1 Cir Brk2 1N4004 4 2 UH680DK Tent Heater Troubleshooting Procedures 1 1 Fuel Supply See PMCS 1 2 Check Flame Switch the flame switch is a normally open heat sensitive switch The UH68G has two switches As used in the 68 outdoor kit only the normally open switch is active Normally switch 1 red and brown wires is used The other switch is normally open and is not used 1 3 Check Fuel Pump The fuel pump operates on 24vdc Energize the pump and listen for operation Remove outlet connector and check 1 for fuel flow Pump develops about 4 psi if fuel slowly runs from pump clean filter as defined in PMCS If fuel runs out of pump at a good steady rate pump is ok 1 4Check Fuel Flow at Carburetor remove fuel needle 1 start heater when combustion blower comes on fuel should run from the fuel needle hole If not fuel flow has been stopped up stream Check fuel solenoid and float bowl needle and seat 1 5Check Ignition Transformer CAUTION The ignition transformer develops 10 000 volts Disconect ignition cable form igniter Pos
9. d small soft wall shelters Features e Variable room temperature control e Remote control with 20 foot cable e Diagnostic LED s on remote control e Low voltage opto isolated controls to eliminate shock hazard e Fan only ventilation WARNING ELECTRICAL SHOCK Attempting to use an unmodified UH68 series heater outdoors may result in electrical shock injury or death 1 1 UH680DK Tent Heater Specifications Manufacturer Hunter Manufacturing Model UH680DK Voltage 120 VAC Cycles 50 60HZ Power 400 watts Heat Output 60 000 BTU nominal Air Flow 650 CFM 5 IWC Back pressure Fuel DF2 DF1 DFA JP8 Dry Weight 130 Lbs Heater is factory set on for DF2 adjustment to the carburetor is necessary for other fuels Gasoline or MOGAS is not recommended for use on the UH68ODK Environmental Temperature Range 65 to 120 F Elevation 10 000 feet MSL Authorized Fuels NOTE HUNTER MFG DOES NOT RECOMMEND THE USE OF GASOLINE OR MOGAS or JP4 Ambient Temperature Specification Military Symbol Above 20 F 6 7 C VV F 800 DF 2 Above 25 F 33 3 C VV F 800 DF 1 Above 25 F 33 3 C MIL T 83 133 JP 5 Above 60 F 51 1 C VV F 800 DF A Above 60 F 51 1 C MIL T 83133 JP 8 1 2 Chapter 2 Operating Instructions Operator Controls and Indicators x aus ry Pau 7 AN lip Cay Suite k IS p Suites AND REIFE isting CONTRA tea RAI Das oe Sm P AG Nain P AULp Owe Le
10. e UNTER NE a gt Oo TE NICO Oy p Table 2 Controls and Indicators Key Control or Indicator Function 1 Main Switch for ventilation UH68 ODK ODH Tent Heater Operators Instructions Starts and stops heater FAN position turns fan only on 2 Set for desired temperature 3 Main Power LED green Indicates heater is plugged in to AC power 4 Standby LED green Indicates main switch is ON but room thermo is not calling for heat 5 Heat LED green energized 6 Fault LED red fault codes table 3 Indicates main switch is ON and combustion system is Blinks a diagnostic code for corresponding fault see Heat output is constant Raising room thermo setting does not heat shelter faster 2 1 UH68 ODK ODH Tent Heater Table 3 Blink Codes Number of Blinks Problem Low voltage at AC input lt 100 VAC Reverse polarity at AC input High voltage gt 130 VAC Not used PC Board over temp Not used Not used Ignition Fault Lockout Note Only the Ignition fault lockout will shut down the heater Any other code will flash the red led but still allow the heater to operate normally 00 NI OD OI BON Table 4 Key Function 1 Connection for power cable 2 Connection for remote control 3 QD fitting for fuel supply
11. er ring is paper thin Inspect for dents scratches and nicks This area must be free of dirt and carbon Mixer Assembly 4 Clean this area using a soft cloth and solvent Wipe with a twisting motion 9 IMPORTANT If the mixer assembly cannot be cleaned satisfactorily replace It Reassembly Figure 1 UH680DK Tent Heater y IMPORTANT The mixer assembly must be seated correctly to insure that your heater has good combustion Figure 1 shows the mixer assembly properly seated in the burner head carburetor not shown for clarity Figure 2 shows the mixer incorrectly seated If left in this position combustion air will leak past the mixer and cause poor combustion and hard starting Figure 2 3 5 UH680DK Tent Heater 1 10 Igniter Check igniter for carbon build up and signs of wear As the igniter wears the gap between 1 and 2 will become wider and oval shaped Replace when signs of wear are evident 1 11 Fuel Pump the fuel pump has a filter screen located at the inlet end To clean remove three screws holding the cap on remove the cap being careful not to tear the gasket and remove the filter screen Pay close attention to the orientation or the filter screen in the pump foe reassembly Clean screen and cap with carb cleaner Cap has a magnet to trap metal particles Reassemble and check for leaks Filter located hare 1 12 Heat Exchanger A he WARNING DEATH OR SERIOUS INJURY
12. eration Under Rainy Conditions 1 The remote control panel is water resistant No PAL special instructions for setting up in the rain 2 Do not remove protective covers from the pe remote and power receptacles until ready to connect 3 To keep rain water from collecting around heater place heater on skid 1 bricks or small logs Make sure heater is stable 4 Paint all chipped and scratched surfaces to prevent rust g ay ve V p Lae j ink j ie Strike Procedure a 1 Drain fuel lines 1 While heater is burning open drain cock 1 on fuel supply line Let heater run until you hear combustion stop burner 2 Move main switch to OFF and allow heater to cool BEFORE PROCEDING MAKE SURE HEATER IS COOLED DOWN AND DISCONNECTED FROM POWER SUPPLY 3 Close drain cock 1 on supply line Using a rag or fuel absorbent mat remove supply line from heater at QD fitting Make sure to hold rag beneath heater QD fitting to catch any fuel left in the fitting 4 Attach heater QD cover 2 5 Hold supply line 3 above fuel can and open drain cock 1 Raise as high as possible to let fuel drain into fuel can 6 Close drain cock 1 and detach supply line from suction feed adapter Coil up Supply line and connect both ends together 4 to keep out dirt 7 Disconnect overflow line and coil up Attach QD cover 2 2 Disconnect ducts 6 and clamps 5 store separate from the heater see duffle bag opti
13. gh stack holder 24 on side of PUDA and over exhaust elbow Push down on stack holder 24 to stabilize stack 2 6 UH68 ODK ODH Tent Heater Operators Instructions 2 7 UH68 ODK ODH Tent Heater Operating Procedures The UH68 ODK can be operated in either of two modes a Heating mode b Fan only mode CAUTION Never operate the UH68 ODK with the pop up duct adapter closed Damage to the internal parts may Heating Mode A NN EN Re ER 1 Set the room thermo 1 to the lowest detent setting 2 Move main switch 2 to HEAT The green standby LED 3 should illuminate 3 Rotate the room thermo until the green HEAT LED 4 illuminates S Fi A ag ogy Ne F After a five second delay the burner will Uy 7 come on You may not hear the burner if you are inside the tent or there is a lot of ambient noise The vent fan will come on when the heat exchanger comes up to temperature The amount of time will vary 30 to 120 seconds depending on the ambient temperature Once the vent fan comes on the heater will continue to operate until the call for heat from the room thermo is satisfied or the main switch is turned off If the airflow is reduced due to very high back pressure the burner will cycle off from time to time 4 Adjust room thermo 1 as necessary Fan Mode Use this mode when no heat is required 1 move main switch 2 to FAN position The vent motor will start and ambient air will circulate throu
14. gh the shelter 2 8 UH68 ODK ODH Tent Heater Operators Instructions Shutdown 2 CAUTION 2 _ Never disconnect power to the heater while heat exchanger is hot Damage to the internal parts may occur 1 Place main switch in off position Vent fan will continue to run until heat exchanger has cooled down The length of time will vary depending on ambient temperature Operation Under Unusual Conditions Extreme Cold Below 10 F There is a thermostatically controlled fuel heater in the carburetor block This heats the fuel when the temperature drops below 40 degrees F Preheating the fuel aids combustion ignition during extremely cold conditions Take these steps to insure reliable operation during extreme cold 1 Keep fuel can full to prevent condensation in tank 2 Clean snow and ice from fuel can filler to prevent moisture from entering fuel can causing fuel line freeze up 3 Rotate the room thermo fully counter clockwise to the lowest detent setting Turn main switch to heat Allow heater to stand for about sixty seconds This allows the carb heater to reach operating temperature before heater is started Operate as described in HEAT MODE section Operation at High Altitudes The UH68 ODK is designed to operate at elevation up to 10 000 feet without any modifications At 10 000 feet heat out put may be reduce about 15 percent This is a normal condition which cannot be prevented 2 9 UH68 ODK ODH Tent Heater Op
15. i Annually Interval Para Annually po BDA a a a 8 Carburetor 1 9 Burner Head 1 9 dgniter TO Fuel Pump 111 Heat Exchanger 1 12 Overheat Safety System 113 ee ee 3 1 UH680DK Tent Heater PMCS Procedures 1 1 Fuel Line System check all fuel lines and fittings for leaks Make sure vent at top Suction Feed Adapter is clear of ice and snow 1 2 Exhaust stack make sure exhaust stack is clear of ice and snow Check for damage or anything that might obstruct the flow of exhaust gas 1 3 Fuel Supply before filling check for water or dirt at the bottom of the can Fill can before operation Heater will operate for about 9 hours with full can Check at regular intervals to avoid running dry 1 4 Electrical connections check cord for nicks or cuts make sure cord is securely plugged in to power supply 1 5 Remote Control Panel check cord for nicks or cuts Check overall condition of control box 1 6 Pop Up Duct Adapter check for cuts in fabric In the field repair cuts with duct tape Cuts may be sewn shut If cut is too large to be sewn shut replace entire fabric interface 1 7 Ducts check for cuts in fabric In the field repair cuts with duct tape Cuts may be sewn shut If cut is too large to be sewn shut replace entire duct 1 8 Sediment Bowl check for dirt and water Clean if necessary 1 9 Carburetor Burner Head use the following procedure to service the carb and burner
16. ial must be kept at least 2 feet away from the sides of the heater during operation Do not attempt service procedures on a burner that has recently been in operation Let the burner cool down before performing these procedures to avoid the possibility of serious burns Never touch the exhaust stack while heater is operating Surface temperatures can exceed 800 degrees F Allow sufficient time for heater to cool before removing exhaust stack The exhaust elbow will remain hot for several minutes after the heater has shut down UH680DK Tent Heater Chapter 1 Introduction Scope Type of manual Operators Model and Name UH680DK and UH68O0DH Forced air tent heater with ducts Purpose of Equipment Circulates heated air in the Alaska TEMPER tent and other soft walled structures Maintains temperature via room thermostat in the remote control panel Control panel also has diagnostic and operating LED s General The UH68ODK is Hunter model UH68G1modified for outdoor usage The outdoor kit may be field installed or factory installed The UH68ODK burns all grades of diesel fuel and JP8 to generate heated air Fuel is pumped from remote tank to the carburetor drawn through the fuel jet by venturi action of the mixer nozzle ignited and burned in the heat exchanger A fan capable of delivering up to 2 IWC static pressure blows the heated air into the tent The UH68ODK has the following applications e Alaska tent Temper Tent e Medium an
17. ition spring at tip of cable not more than 1 8 inch from grounded surface Turn heater on If no Spark is detected check power to igniton transformer 1 6 Check Overheat Thermostat the overheat thermostat 1 is a normally closed temperature sensitive switch Disconnect wires from switch and check continuity across switch 4 3
18. on for storage 3 Remove stack fold PUDA fabric 7 and close PUDA leaving doors open 2 10 UH68 ODK ODH Tent Heater Operators Instructions 2 11 UH68 ODK ODH Tent Heater 8 9 Remove inlet duct collar 8 and stow in PUDA Disconnect Remote Cable 9 coil up and stow in PUDA Disconnect power cable 10 coil up and stow in PUDA Close PUDA Remove stack 11 and stow in storage compartment 13 Secure with spring hold down 12 Store fuel lines in storage compartment 13 Fuel can adapter may be left on the fuel can Make sure to close the air vent 17 Heater can now be transported Packing using duffle bag 2 12 ook collapse both ducts 14 together 2 place band clamps 15 over collapsed ducts 3 place stack 11 inside ducts 4 place all inside duffle bag 16 5 Fuel can adapter may be left on the fuel can Make sure to close the air vent 17 UH68 ODK ODH Tent Heater Operators Instructions 2 13 UH680DK Tent Heater Chapter 3 Maintenance Instructions Lubrication Instructions Doors Pop Up Duct Adapter Lubricate all hinges with MIL A 907 anti seize compound Preventative Maintenance Checks and Services PMCS Systematic periodic PMCS are essential to ensure that the heater is ready for operation at all times Exhaust Stack 4 2 B Fuel Supply _ 13 XJ J BD Hrs B ee Sediment Bowl 18 Description Ref Daily Monthly Sem
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