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®
Chromalox
SERVICE REFERENCE
Installation Instructions
DIVISION 4 SECTION CXH-A
and
SALES
REFERENCE (Supersedes PF490-4) PF490-5
RENEWAL PARTS IDENTIFICATION
161-302421-004
JULY, 2004
DATE
2” 2”
E
Forced Air Heater
for Hazardous Locations
CXH-A-03 EP to CXH-A-35 EP
Class I - Groups C & D, Div. 1 & 2
A
Class II - Groups E, F & G
T3B - 165˚C (329˚F)
B
D
A
11-1/16”
C
Table A – Specifications
5/8” UNC Tapped
Overall Dimensions
Mounting Hole
(In.)
Horiz. Air Lo
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WARNING Failure to understand and follow these installation instructions 7. All unused threaded openings not used for supply wiring must be and the WARNING notes contained therein may result in severe fitted with threaded plugs approved for use in hazardous loca- personal injury, death or substantial property damage. tions. 8. All unit electrical installation fittings, conduit, wiring and seals 1. To reduce the risk of ignition of hazardous atmospheres: must meet NEC and local codes for hazardo
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EXPOSED EXPOSED EXPOSED INSTALLATION the use of a mounting kit (ceiling, wall or pole) available from Chromalox. (Figures 5, 6 and 7) FIRE/EXPLOSION HAZARD. Mount only in upright The ceiling or wall mounting surface and the anchoring pro- position and observe nameplate mounting clear- vision must be sufficient to support the combined weights of the ances. unit and mounting hardware. If using mounting hardware or a supporting structure not Heater Location instructions: supplied by Chromalox, the
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MOUNTING KITS 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” Fan (25-35 kW) 12” Fan - 16-3/4” Heater Mounting 16” Fan - 18-1/2” 1”ø Hardware % Bolt Pole Support Bracket Arm & 20” Fan - 22” Single Point Bracket Hardware Wall Swivel Mount 1/2 ø Hardware Bracket Supplied Not Supplied Single Point Swivel 4”ø Supplied P A
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WIRING AND WIRING DIAGRAMS 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 ELECTRIC SHOCK HAZARD. Disconnect all power necessary to verify that the fan rotation is correct. Air stream before installing or servicing heater. Failure to do so discharge must be out front of unit. After connecting unit to line could result in personal injury or propert
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WIRING DIAGRAMS DIAGRAM I Refer to Name Plate for Input Voltage 1PH L1 L2 Optional Transformer Color Code Tabulation Disconnect Switch PRI PRI. XFMR 120V SEC 24V SEC GND VOLT. LEAD CLRS. LEAD CLRS. LEAD CLRS. C1 Elements 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 M H1 H2 575/600 BLK GRY BLK WHT YEL BLU 1 PH Motor X1 X2 Optional Refer to Nameplate for Transfor
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MODEL NUMBER DESCRIPTION CXH-A 10 4 3 30 401E 1P Explosion Proof Heater Voltage 30 = 24V Controls 1 = Ethylene Group C & D, E, F, G T3B 2 = 240V 6 = 575V 32 = 120V Controls 2 = Propylene Group C & D, E, F, G T3B 0 = No Options 3 = 380V 8 = 208V 3 = Ethylene Group C, D, F, G T3B 1 = 15 or 30 Amp Disconn. Switch 4 = 480V 9 = 600V 4 = Propylene Group C, D, F, G T3B 2 = 60 Amp Disconn. Switch 5 = 415V 3 = Pilot Light 4 = Pilot Light and 30 Amp Heating Element Rating Phase 00 = No Thermos
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MAINTENANCE AND REPAIR The occurrence of the manual reset limit control to trip is an E. Remove 4 bolts in motor base holding it to rear cabinet shelf. abnormal condition. Care should be taken to determine the exact See Figure 13. reason that the high limit control tripped. Possible problem areas F. Remove 4 screws holding fan guard to cabinet. could be dirty heat exchanger, blocked air inlet or outlet, fan/motor malfunction, too high operating ambient, incorrect operating voltage, or leaking he
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MAINTENANCE AND REPAIR which is held tight to the enclosure with a locking nut on the 1. CONTROL TRANSFORMER inside of the enclosure. It must be re-tightened if loosened before This item is located in the electrical enclosure. It may be replaced reuse. Replace the lamp with a 656 type bulb at the correct control while in the enclosure. To service or replace remove the quick voltage for the unit (120V or 24). Secure the lens cap (5 threads connect wires and mark their locations. Remove two screws
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RENEWAL PARTS IDENTIFICATION Electrical Control Voltage 24V 120V Contactor 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 — 315-304252-008 Transformer Contactor Figure 16 15 19 17 33 35 16 1 50 50 51 52 27 31 34 30 25 32 49 28 8 27 44 29 75 26 15 CO 6 10 15 62 12 9 Figure 17 10
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MANUFACTURER PART NUMBER BREAKDOWN (LOCATED ON UNIT NAMEPLATE) CXH-A- - - - EP Common Parts Shown in Figure 17 Motor, Element and Heat Exchanger Parts Code CXH-A-03 CXH-A-15, CXH-A-25, 1/4 HP Motor Heat Exchanger* 05, 07&10 18 & 20 30 & 35 Item# Description Model Item 19 Item 49 Part No. Part No. Part No. CXH-A-03-81 193-302087-006 353-304167-001 1 Panel wrapper 207-303891-001 207-303891-002 207-303891-003 CXH-A-03-83 193-302087-007 353-304167-001 6 Panel Bottom 207-
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Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at http://www.chromalox.com/customer-service/policies/termsofsale.aspx. 2150 N. RULON WHITE BLVD., OGDEN, UT 84404 Phone: 1-800-368-2493 www.chromalox.com
