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Summary of Contents for Chromalox CXH-A
- Page 1 Installation, Operation and Maintenance Instructions CXH-A/B Hazardous Location Forced-Air Heater PF490-5 161-302421-007 January 2025...
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Page 2: Table Of Contents
1. Introduction .......................... 3 2. Safety ............................ 3 3. Specifications and Product Identification ................. 4 4. Mechanical Installation ....................... 8 5.1 Electrical Installation(CXH-A/B..-EP)................11 5.2 Electrical Installation(CXH-B..-CE)................16 6. Operation ........................... 19 7. Preventative Maintenance and Repair ................21 8. Repair and Replacement ....................22... -
Page 3: Introduction
1. Introduction This document contains safety, installation, operation, maintenance, and troubleshooting information for model CXH-A/B unit heaters. Always check www.chromalox.com to ensure you have the latest revision of this document. Revision date is listed on the cover page. 2. Safety ELECTRIC SHOCK HAZARD. -
Page 4: Specifications And Product Identification
Wt. Kg. Model Voltage and Phase (ft.) BTUH /hr) (Lbs.) 380/400/415V 3ph 50Hz 485.8 606.4 533.4 88.9 346.1 CXH-A/B-03 208/240V-1 or 3ph 60Hz 28 (8.5) 10,236 58 (127) (1189) (19-1/8) (23-7/8) (21) (3-1/2) (13-5/8) 480/575V 3ph 60Hz 380/400/415V 3ph 50Hz 485.8... - Page 5 12. Mounting clearances on nameplate must be observed. sure at operating temperature. A material safety data sheet (MSDS) is available from Chromalox upon request. 13. Use copper wire for supply connections according to Should leakage occur, remove unit from service and in- size and rating on nameplate.
- Page 6 Temperature Limitations Ethylene: -40°C to + 40°C (-40°F to 104°F); 40°C (104°F), Intermittently to 130°C (266°F) can be Requested Storage Model CXH-A/B...-EP heaters are UL listed under file KFVR.E32299 NOTE: Model CXH-B...-EP heaters must be used in elevations over 3,000ft...
- Page 7 Table C - Specifications Ex II 2 G Ex db IIB + H2 T3 Gb ATEX ≤ +40°C (-40°F ≤ T ≤ +104°F) -40°C≤ T Ex d IIB + H2 T3 Gb CXH-B...-CE Models IECEx -40°C ≤ T ≤ +40°C (-40°F ≤ T ≤...
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Page 8: Mechanical Installation
4. Mechanical Installation Location 1. Model CXH-A/B heaters are certified for hazardous loca- 5. For best performance, locate heaters according to figure tions listed in table C. When un-crating confirm name- 1. This will promote optimal air circulation and eliminate plate (located on control enclosure lid on left side of heat- hot or cold spots. - Page 9 Mounting 204mm Min. (8") Figure 3 – Installation Clearances Mounting Holes C/L to C/L Heater Model In. (mm) CXH-A/B-03 to CXH-A/B-10 13-5/8 (447.7) CXH-A/B-10 to CXH-A/B-20 17-5/8 (533.4) CXH-A/B-25 to CXH-A/B-35 21-5/8 (635) 5/8-11 Threaded Figure 4 – Mounting Holes...
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Page 10: Unit Top View
Wall Mount Kit Pole or Wall Mount Kit Model # WMB-12 12” Fan (3-10 kW) Model # PMB-12 12” Fan (3-10 kW) Model # WMB-16 16” Fan (15-20 kW) Model # PMB-16 16” Fan (15-20 kW) Model # WMB-20 20” Fan (25-35 kW) Model # PMB-20 20”... -
Page 11: Electrical Installation(Cxh-A/B
5.1 Electrical Installation(CXH-A/B..-EP) CXH-A/B...EP Supply Wiring Requirements Supply Wire Max Fuse ELECTRIC SHOCK HAZARD. Disconnect all power Model Phase Volts 90˚C Size (ga) Amps before installing or servicing heater. Failure to do so could result in personal injury or property damage. - Page 12 Common and Normally Optional Alarm Closed Terminals of One Pole on the Thermostat. Terminal Block Remove this Wire when Using Thermostat Auto Reset High Limit Motor Manual Reset High Limit Elements Optional CXH-A/B...-EP Wiring Diagram I - 1 PH Wiring...
- Page 13 External Thermostat Connect Thermostat Wires to the Common and Normally Closed Terminals of One Pole on the Thermostat. (Red) Motor (Heat) Remove this Wire when Elements White Using Thermostat CXH-A/B...-EP Wiring Diagram II - 1 PH Wiring with Fan Switch...
- Page 14 Common and Normally Contactor Optional Alarm Closed Terminals of One Pole on the Thermostat. Terminal Block Remove this Wire when Using Thermostat Auto Reset High Limit Motor Manual Reset High Limit Elements CXH-A/B...-EP Wiring Diagram III - 3 PH Wiring Optional...
- Page 15 Built-In or External Thermostat Connect Thermostat Wires to the Common and Normally Closed Terminals of One Pole (Red) on the Thermostat. Motor Elements Remove this Wire when Heat Using Thermostat CXH-A/B...-EP Wiring IV - 3 PH Wiring with Fan Switch (White)
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Page 16: Electrical Installation(Cxh-B
5.2 Electrical Installation(CXH-B..-CE) Prior to Installation 1. Follow all safety guidelines in this manual when perform- 6. 1”NPT Entry on top is factory equipped with a non-certi- ing electrical wiring. Electrical installation should be con- fied conduit plug ducted by qualified personnel. 7. - Page 17 Wire Diagram CXH-B...-CE...
- Page 18 Table D – Electrical Ratings Minimum Supply Wire Max. Fuse/ Total Current Circuit (AWG) Breaker size Model Volts Phase (Amps) Amps (90˚C Ambient) (Amps) Wiring Diagram CXH-B-03 10.0 CXH-B-05 12.8 16.0 CXH-B-07 17.6 22.0 CXH-B-10 24.8 31.0 CXH-B-15 36.9 46.2 CXH-B-03 CXH-B-05 CXH-B-07...
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Page 19: Operation
6. Operation 2. The finned structure of the heat exchanger must be kept clean and free of accumulated dust and dirt. The cabi- net front panel is easily removed providing access to the EXPLOSION HAZARD. Heater should not be operated heater core for periodic cleaning. - Page 20 Optional Integral Thermostat 1. Do not tamper with or remove thermostat terminal cover. Thermostat may only be serviced by Chromalox person- nel. 2. Thermostats have a set range from 50-90°F (10-32°C). 3. To set the thermostat rotate dial to desired temperature.
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Page 21: Preventative Maintenance And Repair
7. Preventative Maintenance and Repair Maintenance and repair MUST be performed by qualified personnel only. Check for any sign of leaking from the heat exchanger. EXPLOSION/ELECTRIC SHOCK HAZARD. Disconnect Too little fluid will cause the high temperature cutout(s) to all power before opening enclosure covers or servic- ing heater. -
Page 22: Repair And Replacement
8. Repair and Replacement BURN HAZARD. Be sure heat exchanger and fluid has been allowed to cool to 110°F before proceed- ing. Replacing the Heat Exchanger Depending on model, heat exchanger weighs between 50 - 100lbs (approx. 25-50kg) and must be properly supported from bottom during removal. - Page 23 Replacing Motor and/or Fan Blade B. Loosen the four screws on the cabinet back holding 1. Disconnect the unit from power supply. the fan guard in place. 2. (Units with motor splice box) Remove 4 bolts and cover C. Pull the motor to the rear extending the conduit con- of motor splice box nection at the electrical enclosure.
- Page 24 1. Flameproof joints of the motor are not intended to be repaired. If flameproof joints appear to be damaged, con- If joints or flame paths appear to be damaged contact tact Chromalox immediately for motor replacement. Chromalox immediately for replacement. 2. The anti-condensation heater can be activated only 2.
- Page 25 60 Amp Disconnect 104-304328-002 Washer Shoulder Union conduit 3/4” Spring Union conduit 3/4” Mounting Kit Adapter Terminal Box Cover Conduit Box CXH-A/B-03 through 10 027-302361-001 Screw 10-32 Conduit 3/4” CXH-A/B-15 through 20 027-302361-002 Fan Blade Bolt 5/16-18 Fan Guard Washer...
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Page 26: Troubleshooting
Check for burn marks on the contactor terminals and (turning on/off rapidly) tions / short in wiring look for frayed or loose wires. Replace contactor. Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at http://www.chromalox.com/customer-service/policies/termsofsale.aspx. Chromalox 103 Gamma Drive Pittsburgh, PA 15238 (412) 967-3800 www.chromalox.com...
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