Installation and Operation Instructions CXH-A Forced-Air Heater CXH-A-03 EP to CXH-A-35 EP Class I - Groups C & D, Div.
Table A - Specifications Overall Dimensions (In.) Voltage and Phase 5/8” UNC Tapped Mounting Hole Locations Horiz. Air Discharge (ft.) BTUH CFM Wt. (Lbs.) A B C D E Model kW CXHA-03 3 208/240V-1 or 3Ø 480/575V-3Ø 28 10,236 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8 CXH-A-05 5 208/240V-1 or 3Ø 480/575V-3Ø 28 17,060 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8 CXH-A-07 7.
CXH-A Forced Air Heater for Hazardous Locations overheating of the element and shutting down the unit by tripping the high temperature cutout. 7. All unused threaded openings not used for supply wiring must be fitted with threaded plugs approved for use in hazardous locations. 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. 8.
General Information The CXH-A series units rated 3 through 35 kW are designed for operation in Class I, Div. 1, Groups C & 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 temperatures exceeding 40°C (104°F). All units in Table A are UL listed. Standard model CXH-A unit heaters are factory equipped with an automatic reset type high temperature cutout.
Maximum Out of Plane Allowance 1/2" Max 13mm 1/2" Max 13mm Figure 3 The heaters may be mounted at any convenient height above floor. The minimum spacings shown in Figure 4 should be maintained to adjacent walls and ceiling. If floor heat is desired, do not mount higher than 8 to 10 feet above floor. 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.
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 - 16-3/4” 16” Fan - 18-1/2” 20” Fan - 22” Wall Bracket 1”ø Hardware % Bolt Single Point Swivel Mount Supplied 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 & Hardware 1/2 ø Hardware Not Supplied Pole Support Bracket Single Point Swivel 4”ø Supplied P Adapter Bracket Supplied
Wiring and Wiring Diagrams Table B -Supply Wiring Requirements Supply Wire 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 accordance with the National Electrical Code, NFPA 70. ELECTRIC SHOCK HAZARD.
unit and investigate cause of abnormal operation. Do not reenergize until the problem has been corrected. 9. Protection against overheating is provided by a high temperature cutout 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 high temperature cutout.
Transformer Color Code Tabulation PRI VOLT. Refer to Nameplate for Input Voltage 1PH L1 L2 Optional Disconnet Switch PRI. XFMR LEAD CLRS. 120V SEC 24V SEC LEAD CLRS. LEAD CLRS. H1 H2 X1 X2 X1 X2 208 BLK RED BLK WHT YEL BLU 240 BLK ORG BLK WHT YEL BLU 380 BLK VIO BLK WHT YEL BLU 415 BLK YEL BLK WHT – – 415 BLK BRN – – YEL BLU 480 BLK BLK/RED BLK WHT YEL BLU 575/600 BLK GRY BLK WHT YEL BLU Optional Aux. Cont.
Transformer Color Code Tabulation PRI VOLT. Refer to Nameplate for Input Voltage H1 H2 X1 X2 X1 X2 BLK RED BLK WHT YEL BLU 240 BLK ORG BLK WHT YEL BLU 380 BLK VIO BLK WHT YEL BLU 415 BLK YEL BLK WHT – – 415 BLK BRN – – YEL BLU 480 BLK BLK/RED BLK WHT YEL BLU 575/600 BLK GRY BLK WHT YEL BLU Optional Disconnet Switch H2 Primary H1 Control Transformer Refer to Nameplate for Primary (Input) and Secondary (Control) Voltage. Optional Aux. Cont.
Refer to Nameplate for Input Voltage Transformer Color Code Tabulation PRI VOLT. 3PH L1 L2 L3 Optional Disconnet Switch Optional Aux. Cont.
Operation 2. The finned structure of the heat exchanger must be kept clean and free of accumulated dust and dirt. The cabinet front panel is easily removed providing access to the heater core for periodic cleaning. EXPLOSION HAZARD. Heater should not be operated in ambient temperature higher than 40°C (104°F) or in atmospheres corrosive to the heater itself. 3. Unit should not be operated with louvers fully closed.
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.
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 nameplate, previous notes, and marked wires, reconnect the motor for the unit voltage rating as indicated on the heater nameplate. Re-attach the ground wire to the connection inside the enclosure. Replace cover and tighten securely. B. Loosen the four screws on the cabinet back holding the fan guard in place. C.
Renewal Parts Identification Publication Number Title PF458 Mounting Kits for Model CXH-EP PF461 Material Safety Data Sheet Chromakool EG PF462 Material Safety Data Sheet Chromakool PG Electric Control Voltage Contactor Transformer 208/240/480 PRI Transformer 575 PRI Aux.
15 19 17 33 35 16 1 50 50 51 52 27 31 34 32 30 25 49 28 8 27 44 29 75 26 15 CO 15 6 62 10 12 Figure 17 16 9
Manufacturer Part Number Breakdown (Located On Unit Nameplate) CXH-A- h h - h h - h h - EP Common Parts Shown in Figure 17 Code CXHA-03, 05, 07 & 10 Item# Description Part No.
Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at http://www.chromalox.com/customer-service/policies/termsofsale.aspx. 1347 HEIL QUAKER BLVD., LAVERGNE, TN 37086 Phone: (615) 793-3900 www.chromalox.com 18 © 2013 Chromalox, Inc.
