Chromalox PF490-5 Air Conditioner User Manual
Contents
1. D and Class II Div 1 Groups E F and G hazardous atmospheres having an ignition temperature of 165 C 329 F or higher They are designed for comfort heating and should not be operated in ambient tempera tures exceeding 40 104 F units in Table A are UL listed The units are easily adapted for wall ceiling or pole mounting Refer to Figure 4 on Page 3 for mounting information They are supplied with either 24 or 120V internal control circuit voltage The heater is designed for use with an external hazardous location thermostat or optional built in thermostat The standard heater is designed to operate up to 7500 feet 2 286m altitude Consult factory for specific recommen dations when using the units at higher altitudes INSTALLATION FIRE EXPLOSION HAZARD Mount only upright position and observe nameplate mounting clear ances Heater Location instructions Arrange units so their discharge air streams A are subjected to a minimum of interference from columns machinery and partitions wipe exposed walls without blowing directly at them are directed away from room occupants in comfort heating are directed along the windward side when installed in a building exposed to a prevailing wind Locate thermostat on interior partition walls or posts away from cold drafts internal heat sources and away from heater dis charge air streams Small rooms can be heated by one un2. Screws J Feed motor wires back into conduit and reposition motor back on unit Center fan blade in opening and rotate to be sure that it clears housing and guard K Thread motor nipple connection into conduit union and tight en 5 threads minimum Replace bolts in motor base and reat tach fan guard to back of housing in four places Recheck blade rotation and tighten all hardware L Trim all motor leads extending out of the conduit to 6 lengths Strip off 3 8 of insulation at cut ends Using the motor name plate previous notes and marked wires reconnect the motor for the unit voltage rating as indicated on the heater name plate Re attach the ground wire to the connection inside the enclosure Replace cover and tighten securely M Check fan rotation by momentarily energizing the unit Air must exit at cabinet front Reverse any 2 leads at contactor or line supply disconnect to reverse rotation of three phase motor 3 Removal of fan blade does not require that the motor wiring be disturbed To clean service or change the fan blade proceed as follows A Remove the four carriage bolts holding the motor base in place on the cabinet platform Mark the platform to reposition at same location B Loosen the four screws on the cabinet back holding the fan guard in place C Pull the motor to the rear extending the conduit connection at the electrical enclosure Fan blade and hub set screws can now be accessed by tilting the guard
3. 2 Max 13mm T Figure 3 The heaters may be mounted at any convenient height above floor The minimum spacings shown in Figure 4 should be main tained to adjacent walls and ceiling If floor heat is desired do not mount higher than 8 to 10 feet above floor Controlling thermostats to individual heaters should be mounted at shoulder height on inside walls or columns and clear of the discharge air stream of the unit Allow at least 4 in front of heater for air stream to discharge freely Do not mount mercury type thermostat directly on unit vibration could cause malfunction 102mm Min 4 Figure 4 1 2 Max 13mm Heater may be mounted on a shelf or stand from the bottom Be sure that mounting clearances are maintained and that bottom of unit has at least 1 clearance underneath it This is necessary for good air circulation and servicing of heat exchanger All mount ing methods must allow for removal of front cover The mounting and anchoring provisions must take into account the unit vibration and cantilevered loading when wall or pole mounted One of the Chromalox mounting kits shown in Figures 5 6 and 7 must be used whenever possible Installation Clearances Thds For 5 8 NC 2 Mounting MOUNTING KITS Wall Mount Kit Model WMB 12 12 Fan 3 10 kW Model WMB 16 16 Fan 15 20 kW Model WMB 20 20 Fan 25 35 kW 12 Fan 16
4. 303891 003 207 303881 003 207 303883 003 182 303884 003 328 302074 002 276 130368 001 080 302079 001 248 073662 002 Consult Factory 134 302063 006 347 304561 001 345 075603 263 328 075528 085 328 075571 011 200 075473 044 221 302180 001 221 302180 003 354 302165 001 354 302243 001 069 304115 002 Consult factory 221 302180 002 345 075603 218 328 075571 010 200 075473 039 080 042350 007 069 115087 093 CXH A 03 81 193 302087 006 Heat Exchanger Item 49 353 304167 001 CXH A 03 83 193 302087 007 353 304167 001 03 21 193 302087 006 353 304167 002 03 23 03 43 193 302087 007 193 302087 007 353 304167 002 353 304167 005 03 63 193 302087 008 353 304167 006 05 81 193 302087 006 353 304167 008 05 83 193 302087 007 353 304167 008 05 21 193 302087 006 353 304167 009 05 23 05 43 193 302087 007 193 302087 007 353 304167 009 353 304167 012 05 63 193 302087 008 353 304167 013 07 81 193 302087 006 353 304168 001 07 83 193 302087 007 353 304168 001 07 21 193 302087 006 353 304168 002 07 23 07 43 193 302087 007 193 302087 007 353 304168 002 353 304168 005 07 63 193 302087 008 353 304168 006 10 83 193 302
5. 8 Hardware Cust Supplied 9 1 2 x 4 U Bolts amp Hardware Cust Supplied 3 1 2 SCH 40 Pipe or 4 0 D X 25 Wall Tube Cust Supplied Length to Suit Pole Base 3 8 Hardware Required for Mounting Cust Supplied CXH 03 through CXH 10 CXH 10 through CXH 20 Figure 6 CXH 25 through CXH 35 1 NPT Top Line Supply Entry 1 2 NPT Thermostat Entry 5 8 11 Threaded Mounting Holes 2 Figure 10 WIRING AND WIRING DIAGRAMS AWARNING ELECTRIC SHOCK HAZARD Disconnect all power before installing or servicing heater Failure to do so could result in personal injury or property damage Heater must be installed by a qualified person in accor dance with the National Electrical Code NFPA 70 ELECTRIC SHOCK HAZARD Any installation involving electric heaters must be performed by a qualified person and must be effectively grounded in accor dance with the National Electrical Code to eliminate shock hazard Loosen and remove bolts securing the main terminal enclosure cover on side of unit Connect heater to line supply wires at the box lugs located on the contactor according the voltage and fre quency specified on the nameplate see Figure 9 Refer to the appropriate wiring diagram which also appears
6. Color Code Tabulation Disconnect Switch PRI PRI XFMR 120V SEC 24V SEC VOLT LEAD CLRS LEAD CLRS LEAD CLRS Gl H2 X1 X2 X1 x2 BLK BLK RED 575 600 BLK GRY Refer to Nameplate m Sf ptlonal 005 N for Transformer Voltage ae Auxiliary Alarm Factory Wiring Contactor p Optional or Customer Wirinc Contactor Coil N Ae aA 2 s Manual Reset High Limit Remove this wire when using a thermostat Built in or External Thermostat DIAGRAM I Refer to Name Plate for Input Voltage Transformer Color Code Tabulation Optional PRI PRI XFMR 120V SEC 24V SEC Disconnect VOLT LEADCLRS LEADCLRS LEADCLRS Switch C1 Elements 208 t ae 240 415 YEL 415 BRN 480 BLK RED 575 600 GRY Refer to Nameplate M Fl a m for Transformer Voltage ar TN Factory Wiring Auxiliary Alarm Optional or Customer Wirir Contactor p Contactor Coil Manual Reset High Limit Control Remove this wire when using a thermostat Built in or External Thermostat MODEL NUMBER DESCRIPTION 10 4 30 Heater Voltage 2 240 6 575V 3 380V 8 208V 4 480V 9 600V 5 415V Heating Element Rating Phase 03 3 0kW 18 18 0 kW 1 1 Phase 05 5 0kW 20 20 0 kW 3 3 Phase 07 7 5kW 25 25 0 kW 10 1
7. Motor Element and Heat Exchanger Parts Description Panel wrapper Panel Bottom Panel Front Louver Washer Shoulder Spring Terminal Box Cover Screw 10 32 Fan Blade Fan Guard Enclosure Bolt 3 8 16 1 5 Ig Washer flat Washer lock Hex Nut 3 8 16 Plug conduit 1 2 Plug conduit 1 Union conduit 3 4 Union conduit 3 4 Conduit Box Conduit 3 4 Plug conduit 3 4 Bolt 5 16 18 Washer Nut 5 16 18 Cover Exp Proof Conduit 3 4 Code CXH A 03 05 07 amp 10 Part No 207 303891 001 207 303881 001 207 303883 001 182 303884 001 328 302074 002 276 130368 001 080 302079 001 248 073662 002 Consult Factory 134 302063 004 347 304561 001 345 075603 263 328 075528 085 328 075571 011 200 075473 044 221 302180 001 221 302180 003 354 302165 001 354 302243 001 Consult factory Consult factory 221 302180 002 345 075603 218 328 075571 010 200 075473 039 080 042350 007 069 115087 049 CXH A 15 18 amp 20 Part No 207 303891 002 207 303881 002 207 303883 002 182 303884 002 328 302074 002 276 130368 001 080 302079 001 248 073662 002 Consult Factory 134 302063 005 347 304561 001 345 075603 263 328 075528 085 328 075571 011 200 075473 044 221 302180 001 221 302180 003 354 302165 001 354 302243 001 069 304115 002 Consult factory 221 302180 002 345 075603 218 328 075571 010 200 075473 039 080 042350 007 069 115087 079 Optional Equipment Parts Part Number CXH A 25 30 amp 35 Part No 207
8. a factory supplied identical motor Failure to do so will void the factory warranty and may expose the user to risk of ignition of hazardous atmospheres Check fan blade to be sure that set screws are tight and there are no cracks or looseness in the blades Use factory supplied replace ment blade only Check for any sign of leaking from the heat exchanger Too little fluid will cause the manual high limit to trip The sealed heat exchanger contains a glycol water solution of propylene glycol Ethylene glycol is supplied for arctic duty con ditions only Avoid contact with skin and eyes If ingestion should occur seek medical attention immediately In case of eyes or skin contact wash affected areas with large amounts of water The MSDS Material Safety Data Sheet for these materials is available upon request N w A a 2 I REPLACING THE HEAT EXCHANGER ACAUTION BURN HAZARD Be sure heat exchanger and fluid has been allowed to cool to 110 F before proceeding 1 Detach the cabinet front by removing screws from all sides of unit and pulling cover forward off cabinet shell Detach bottom panel by removing two screws on each side and two screws in the rear Remove the electrical control enclosure lid Disconnect the heater and high limit wires from the electrical control enclosure Loosen electrical conduit union located between the heater housing and the electrical control enclosure Support the lower end of the h
9. across the thermostat contacts when they are open The minimum thermostat contact rating should be 1 amp 2 120 VAC Refer to nameplate for control voltage of unit The 1 2 NPT con duit wiring entry on top of the terminal enclosure should be used to wire the thermostat to the heater Figure 10 Protection against overheating is provided by a manual reset limit control located within the heat exchanger wiring compartment Figure 9 Activation of the control will open the control circuit and energize the pilot lamp if supplied If normal airflow is restricted or stopped the unit will be cycled off by the manual reset cutout The manual reset limit control is also designed to shut down the unit completely if the fluid level is low or other heater malfunction occurs Manual reset limit control must never be bypassed the control circuit If the limit actuates shut down unit and investigate cause of abnormal operation Do not reenergize until the problem has been corrected Users should install adequate back up controls and safety devices with their electric heating equipment If the back up controls are to be located in the haz ardous area they must be approved for use in the class of location Where the consequences of failure may be severe back up controls are essential ge 2 WIRING DIAGRAMS DIAG RAM Refer to Name Plate for Input Voltage Optional Transformer
10. lamp with a 656 type bulb at the correct control voltage for the unit 120V or 24 Secure the lens cap 5 threads minimum against the locking ring and tighten securely before re energizing unit Lamp should flash on momentarily when unit is energized See renewal parts section for part number of replace ment bulbs Figure 15 CXH A with Built in Thermostat RENEWAL PARTS IDENTIFICATION Mounting Kits for Model CXH EP Material Safety Data Sheet Chromakool EG PF462 Material Safety Data Sheet Chromakool PG Contactor RENEWAL PARTS IDENTIFICATION Electrical Control Voltage 072 304551 002 072 304551 008 Transformer 208 240 480 PRI 315 304252 002 315 304252 001 Transformer 575 PRI 315 304252 005 315 304252 003 Aux Contactor 072 304551 102 072 304551 102 Transformer 380 415 PRI 315 304252 006 315 304252 007 Transformer CXH B Figure 16 Figure 17 Contactor gt 315 304252 008 Transformer S 10 MANUFACTURER PART NUMBER BREAKDOWN LOCATED ON UNIT NAMEPLATE EP CXH A Common Parts Shown in Figure 17
11. on the inside cover of this enclosure see Table B and diagrams on page 6 EXPLOSION HAZARD Cover joints must be clean before replacing cover Do not use any gasket materi al on joint surfaces 2 Use copper conductors only for supply wires Refer to name plate and Table B for size and rating required 3 Connect supply line ground conductor to the box lug provided on the base plate below contactor input lugs Table B Supply Wiring Requirements CXH A 03 CXH A 03 CXH A 03 CXH A 03 CXH A 03 CXH A 03 CXH A 05 CXH A 05 CXH A 05 CXH A 05 CXH A 05 CXH A 05 CXH A 07 CXH A 07 CXH A 07 CXH A 07 CXH A 07 CXH A 07 CXH A 10 10 CXH A 10 10 CXH A 10 10 CXH A 10 10 CXH A 10 10 CXH A 15 15 CXH A 15 15 CXH A 15 15 CXH A 15 CXH A 18 CXH A 20 CXH A 20 15 20 20 CXH A 25 25 CXH A 25 25 30 30 35 35 Wiring Ci Ci C C Co Co Co CXH A 30 CXH A 30 CXH A 35 CXH A 35 4 The fan motor is factory wired at the same voltage and phase as the heating elements All motors are thermally protected and con nected to the main supply contactor On three phase units it is necessary to verify that the fan rotation is correct Air stream discharge must be out front of unit After connecting unit to line and closing all covers tightly energize unit momentarily If air does not exit front louvers reverse any two supply leads at the box lugs on the co
12. rearward at top or bottom back over the motor shell IV ELECTRICAL COMPONENT SERVICING EXPLOSION ELECTRIC SHOCK HAZARD Disconnect all power before opening enclosure covers or servic ing heater Failure to comply could result in personal injury or property damage When provided the following components are located in the cast aluminum hazardous location enclosure Remove cover and retaining bolts to gain access the following items See Figure 16 MAINTENANCE AND REPAIR 1 CONTROL TRANSFORMER This item is located in the electrical enclosure It may be replaced while in the enclosure To service or replace remove the quick connect wires and mark their locations Remove two screws which hold the transformer in place Note transformer orientation and voltage labels on top Replace transformer in the same orien tation and connect wires Replace the cast aluminum cover and bolt down CONTACTOR This component can be removed from the base plate while in the enclosure Follow the same steps as indicated for the transformer replacement ALARM PILOT LAMP OPTIONAL To replace the bulb unscrew the red lens bezel while holding the lock ring until disengaged Avoid turning the entire assembly Figure 14 CXH A with Built in Disconnect Switch Must use HMK 00 Ceiling Mounting Kit which is held tight to the enclosure with a locking nut on the inside of the enclosure It must be re tightened if loosened before reuse Replace the
13. 0 0 kW 30 30 0 kW 15 15 0 kW 35 35 0 kW Electric Blower Unit Heater for Hazardous Locations 30 24V Controls 32 120V Controls 40 1 1 Ethylene Group C amp D E G 2 Propylene Group C amp D E F G 3 Ethylene Group C D F G T3B 4 Propylene Group C D F G T3B Explosion Proof 0 Options 15 or 30 Amp Disconn Switch 60 Amp Disconn Switch Pilot Light Pilot Light and 30 Amp Disconn Switch Pilot Light and 60 Amp Disconn Switch Summer Fan Switch Summer Fan Switch Pilot Light Disconn Switch with Summer Fan Switch 9 Disconn Switch Pilot Light with Summer Fan Switch ou m mw 00 No Thermostat 40 Thermostat 1 OPERATION EXPLOSION HAZARD Heater should not be operated in ambient temperature higher than 40 C 104 F or in atmospheres corrosive to the heater itself 1 The CXH A unit heaters use a sealed water glycol filled heat exchanger The electric immersion elements transfer heat energy directly to the fluid generating a fluid vapor mixture which releas es its heat energy to the finned radiator as it rises and recondenses back to the bottom reservoir to be reheated This cycle will con tinue as long as fan forced air is available on the finned structure to remove the heat to the airstream 2 The finned structure of the heat exchanger must be kept clean and free of accumulated dust and dirt T
14. 087 007 353 304168 008 10 21 193 302087 006 353 304168 009 10 23 193 302087 007 353 304168 009 10 43 10 63 193 302087 007 193 302087 008 353 304168 012 353 304168 013 15 83 193 302087 007 353 304169 001 15 23 193 302087 007 353 304169 002 15 43 193 302087 007 353 304169 005 15 63 193 302087 008 353 304169 006 18 23 20 43 193 302087 007 193 302087 007 353 304169 008 353 304169 012 20 63 193 302087 008 353 304169 013 1 2 HP Motors CXH A 25 43 193 302087 009 353 3041 70 003 CXH A 25 63 193 302087 010 353 3041 70 004 CXH A 30 43 CXH A 30 63 193 302087 009 193 302087 010 353 3041 70 008 353 304170 009 Thermostat 30 Amp Disconnect 60 Amp Disconnect Pilot Light Ass y 24V Pilot Light Ass y 120V Pilot Lamp 24V Pilot Lamp 120V 300 113075 003 104 304328 001 104 304328 002 213 121103 017 213 121103 018 172 052561 004 172 052561 003 CXH A 35 43 193 302087 009 353 304170 012 CXH A 35 63 193 302087 010 353 304170 013 Forarctic duty conditions heat exchanger with ethylene glycol are required Consult factory AWARNING The factory must perform the replace ment of the immersion heater or 027 302361 001 overtemperature cutout The heat 027 302361 00
15. 2 exchanger seal must not be broken 027 302361 003 Consult factory for service Mounting Kit Adapter CXH A 03 through 10 CXH A 15 through 20 CXH A 25 through 35 11 Limited Warranty Please refer to the Chromalox limited warranty applicable to this product at http Awww chromalox com customer service policies termsofsale aspx Chromalox PRECISION HEAT AND CONTROL 2150 N RULON WHITE BLVD OGDEN UT 84404 Phone 1 800 368 2493 www chromalox com
16. 3 4 16 Fan 18 1 2 20 Fan 22 Wall Bracket 1 g Hardware Bolt Single Point Swivel Mount Supplied 1 2 Hardware Not Supplied Adapter Bracket amp 5 8 NC Hardware Supplied 1I 5 1 2 12 Fan 5 1 8 16 Fan 6 3 8 20 Fan CXH O3EP through CXH 10 CXH 10EP through CXH 20 CXH 25EP through CXH 35 P 10 11 1 2 P 1 Figure 5 4 1 2 Ceiling Mount Kit Model HMK 00 Cust Supplied 1 2 Mounting Hardware Bracket Spacing suitable for use with 4 U Bolts a m 4 9 16 Swivel Ceiling ___y F Hanger S A amp Hardware ol 5 8 Hex Nuts ad Washers 9 5 8 Rods Length to suit 1 Min Threaded Ends Supplied for Customer Supplied Installation oe Top amp Bottom Figure 7 Electrical Components Transformer Jumper Wire Pilot Lamp Opt Contactor Heat Exchanger Wiring Compartment Figure 9 Pole or Wall Mount Kit Model PMB 12 12 Fan 3 10 kW Model PMB 16 16 Fan 15 20 kW Model PMB 20 20 Fan 25 35 kW Heater Mounting Bracket Arm amp Pole Support Hardware Bracket Single Point Swivel 4 g Supplied Adapter Bracket Supplied with 5 8 Bolts 9 3
17. Chromalox Installation Instructions and RENEWAL PARTS IDENTIFICATION Forced Air Heater for Hazardous Locations CXH A 03 EP to CXH A 35 EP Class I Groups C amp D Div 1 amp 2 Class Il Groups E F amp G T3B 165 C 329 F Vv Chromalox Horiz Air Discharge Voltage and Phase Ft 208 240V 1 or 30 480 575V 30 DIVISION 4 S SERVICE REFERENCE SECTION CXH A CHROMALOX y 88 qo Overall Dimensions In 23 7 8 5 8 UNC Tapped Mounting Hole Locations 208 240V 1 or 30 480 575V 30 208 240V 1 or 30 480 575V 30 23 7 8 240V 1 or 30 208 480 575V 30 3 1 2 208 240 480V 575V 30 240V 30 61 420 4 13 32 4 13 32 480 575V 30 68 240 4 13 32 480 575V 30 85 300 5 1 2 480 575V 30 102 360 5 1 2 2010 Chromalox Inc 480 575V 30 119 420 5 1 2 WARNING Failure to understand and follow these installation instructions and the WARNING notes contained therein may result in severe personal injury death or substantial property damage 1 To reduce the risk of ignition of hazardous atmospheres In accordance with the National Electrical Code do not install where operating temperature code exceeds the ignition tempera ture of the hazardous atmosphere Use only i
18. eat exchanger and loosen the three hex head bolts which hold it to the sheet metal Lower the heat exchanger away from the sheet metal Reverse the above procedure when installing a new heat exchanger II RESETTING MANUAL RESET LIMIT CONTROL EXPLOSION HAZARD Be sure that all enclosure cov ers are replaced and tightly closed before re energiz ing unit after servicing electrical components High limit controls must never be bypassed in control circuit The factory must perform the replacement of the immersion heater or overtemperature cutout The heat exchanger seal must not be broken Consult fac tory for service MAINTENANCE AND REPAIR The occurrence of the manual reset limit control to trip is an abnormal condition Care should be taken to determine the exact reason that the high limit control tripped Possible problem areas could be dirty heat exchanger blocked air inlet or outlet fan motor malfunction too high operating ambient incorrect operating voltage or leaking heat exchanger In the event that the heat exchanger is defective it must be replaced 1 The manual reset limit control is located in the heating element hazardous location enclosure on the heat exchanger which is covered by the sheet metal housing attached to the side of the unit To gain access remove the four sheet metal screws holding the sheet metal cover in place and unthread the cast aluminum enclosure lid See Figure 11 The manual reset limit cont
19. he cabinet front panel is easily removed providing access to the heater core for periodic cleaning Unit should not be operated with louvers fully closed Mechanical stops are incorporated into the design of the cabinet to limit the degree of closure Do not force the louvers beyond these stops If specified units are supplied with a built in alarm pilot lamp which will energize if the manual reset control has a been activat ed During unit startup the lamp will flash on momentarily to ver ify its operation a A MAINTENANCE AND REPAIR Maintenance and repair must be performed by qualified personnel only AWARNING EXPLOSION ELECTRIC SHOCK HAZARD Disconnect all power before opening enclosure covers or servic ing heater Failure to comply could result in personal injury or property damage 1 Periodically inspect all electrical connections and terminals to avoid electrical wiring difficulties Inspect all wiring for frayed or worn insulation Periodically and before each heating season clean the finned heat exchanger and fan inlet with compresses air vacuum or water jet Be sure all electrical covers are tightly closed If heat output seems to be low check amperage draw on each ele ment Compare measured values to the correct currents as listed on the unit nameplate The thermally protected fan motor is permanently lubricated and sealed No field servicing is required or should be attempted Replace only with
20. it heater Where two walls are exposed the heater should be mounted as shown in Figure 2 Large rooms require multi unit installations Number and capacity of units will be determined by volume of building and square feet of floor area to be heated Arrange units to pro vide perimeter air circulation where each unit supports the air stream from another The CXH A hazardous location heaters are designed for use only in a permanently mounted upright position We recommend the use of a mounting kit ceiling wall or pole available from Chromalox Figures 5 6 and 7 The ceiling or wall mounting surface and the anchoring pro vision must be sufficient to support the combined weights of the unit and mounting hardware If using mounting hardware or a supporting structure not supplied by Chromalox the unit should be suspended from the supporting structure thru the two mounting points on top of the unit with 5 8 NC bolts and lockwashers If single point mounting is desired order the correct size Chromalox adapter bracket P N 027 302361 001 for 12 fan units P N 027 302361 002 for 16 fan units and P N 027 302361 003 for 20 fan units This bracket is designed to hold the unit over its center of gravity with a 1 dia bolt The maximum tilt angles as shown in Figure 3 must not be exceeded in either direction during operation and installation Failure to comply will cause high limit shut down Maximum Out of Plane Allowance 1
21. n atmospheres hav ing an ignition temperature higher than 165 329 F 2 Disconnect from supply circuit before opening enclosures 3 Hazard of Electric Shock Heater must be effectively grounded in accordance with N E C to eliminate shock hazard 4 Heat exchanger contains Propylene Glycol under pressure at oper ating temperature A material safety data sheet MSDS is avail able from Chromalox upon request Should leakage occur remove unit from service and investigate cause 5 Keep all electrical enclosure covers tightly closed and secured with all bolts and threads Cover joints must be clean before replacing covers 6 Install and operate in upright position only Refer to Figure 3 for level requirements Failure to comply will cause overheating of the element and shutting down the unit by tripping the high tem perature cutout Integral heavy duty magnetic contactor Explosion proof NEMA 7 and 9 controls enclosure Explosion proof motor Motor connections wiring access Convenient terminal block for room thermostat connection Protective housing for immersion heater terminal enclosure Heavy duty immersion heater assembly with manual reset limit control and NEMA 7 and 9 terminal enclosure Mounting bolt hanger connections 7 All unused threaded openings not used for supply wiring must be fitted with threaded plugs approved for use in hazardous loca tions 8 All unit electrical installation fitting
22. ntactor or at the supply disconnect 5 Either of two 1 NPT rigid conduit openings with integral stops may be used for connection to supply line See Figure 9 and 10 for locations Use only NEC approval hazardous locations means of wiring such as mineral insulated cable and fittings or rigid con duit and seal fittings located as required by installation codes EXPLOSION HAZARD All unused conduit openings must be fitted with plugs that are U L recognized for use in hazardous locations 6 Heaters may be provided with a built in control switch and or thermostat If not they should be controlled by an externally mounted disconnect switch and or separately mounted thermostat as shown in the appropriate wiring diagram on page 6 In case of malfunction the personnel in the area should be aware of location of heater disconnect Installation must include appropriate over current protection devices fusing or circuit breakers as required by the National Electric Code in the supply line to the unit Refer to nameplate for proper current ratings To operate heaters from an externally mounted hazardous location thermostat a terminal block is provided for connection Figures 9 and 10 Remove the factory installed jumper across T2 and T3 on the terminal strip Wire the thermostat contact leads to these ter minals The built in control transformer supplies the unit with either 24V or 120V for internal unit operation This voltage will appear
23. rol device has a small reset button protruding from the center of its back housing Depress this button in to reset the control Replace the aluminum enclosure lid and sheet metal cover Figure 11 FAN MOTOR AND BLADE 1 The motor is a sealed unit that requires no lubrication If the motor is defective it must be replaced with an original factory supplied motor See renewal parts section 2 To replace the motor proceed as follows A Disconnect the unit from power supply B Units with motor splice box Remove 4 bolts and cover of motor splice box See Figure 12 C Units without motor splice box Remove 16 bolts and cover of main control enclosure D Note wire connections for future reference and disconnect all wires leading to the motor All motor wires are permanently marked according to the nameplate on the motor E Remove 4 bolts in motor base holding it to rear cabinet shelf See Figure 13 F Remove 4 screws holding fan guard to cabinet Figure 13 G Unthread union at motor wiring outlet nipple connection Carefully lift the motor fan blade and guard off of the cabi net H Note position of fan blade on motor shaft Loosen the two set screws to remove the fan blade and key from shaft motor I Place guard and fan blade on replacement motor shaft in same locations as original motor Align key ways in hub and shaft Insert key flush with fan hub and tighten the two hub set
24. s conduit wiring and seals must meet NEC and local codes for hazardous locations 9 External line fusing or circuit breaker protection is required 10 Hi limit cutouts must never be bypassed in the control circuit 11 Alarm pilot lamp if supplied will turn on if the high limit control actuates Steady on lamp indicates manual reset protector has tripped This could result if the heat exchanger is obstructed dirty inlet air restricted or fan not turning Shut off power to unit and refer to repair procedures section of instruction sheet 12 Mounting clearances on nameplate must be observed 13 Use copper wire for supply connections according to size and rat ing on nameplate 14 Do not install any type of gasket material on any of the electrical junction box cover surfaces 15 Do not attempt to override louver stops or operate unit with lou vers fully closed Polyester powder coated heavy gauge steel corrosion resistant cabinet Overpressure protection device Heavy gauge adjustable louver with minimum opening stops to direct air flow Removable front cover DA for ease of cleaning High efficiency heat exchanger with integral aluminum finned steel tubes Optional service light to indicate when unit needs servicing Built in 120V control circuit transformer Optional 24V available GENERAL The CXH A series units rated 3 through 35 kW are designed for operation in Class I Div 1 Groups C amp
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