XI. ELECTRICAL CONNECTIONS
WARNING
HIGH VOLTAGE!
TO AVOID THE RISK OF ELECTRICAL SHOCK, WIRING TO THE UNIT MUST BE POLARIZED AND GROUNDED.
Line voltage connections can be made through either the right or left side panel. The furnace is shipped configured for a left side (right side for counterflows) electrical connection with the junction box located inside the burner compartment. To make electrical connections through the opposite side of the furnace, the junction box must be relocated to the other side of the burner compartment prior to making electrical connections. To relocate the junction box, observe the fol- lowing steps.
JUNCTION BOX RELOCATION
WARNING | WARNING |
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HIGH VOLTAGE!
TO AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND
EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A PRECAUTION WHEN REMOVING HOLE PLUGS.
1.Remove the burner compartment door.
2.Remove and save the two screws securing the junction box to the side panel.
3.Relocate junction box and associated plugs and grommets to opposite side panel. Secure with screws removed in step 2.
DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
WIRING HARNESS
The wiring harness is an integral part of this furnace. Field alter- ation to comply with electrical codes should not be required. Wires are color coded for identification purposes. Refer to the wiring diagram for wire routings. If any of the original wire as supplied with the furnace must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C. Any re- placement wiring must be copper conductor.
115VOLT LINE CONNECTIONS
STANDARD
JUNCTION BOX
LOCATION
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Junction Box Relocation
ALTERNATE
JUNCTION BOX
LOCATION
Before proceeding with electrical connections, ensure that the sup- ply voltage, frequency, and phase correspond to that specified on the unit rating plate. Power supply to the furnace must be N.E.C. Class 1, and must comply with all applicable codes. The furnace must be electrically grounded in accordance with local codes or, in their absence, with the latest edition of The National Electric Code, ANSI NFPA 70 and/or The Canadian Electric Code CSA C22.1.
Use a separate fused branch electrical circuit containing properly sized wire, and fuse or circuit breaker. The fuse or circuit breaker must be sized in accordance with the maximum overcurrent pro- tection specified on the unit rating plate. An electrical disconnect must be provided at the furnace location.
NOTE: Line polarity must be observed when making field connections.
Connect hot, neutral, and ground wires as shown in the wiring diagram located on the unit’s blower door. For direct vent applica- tions, the cabinet opening to the junction box must be sealed air tight using either a UL approved bushing such as Heyco Liquid Tight or by applying a UL approved
Line polarity must be observed when making field connections.
WARNING
HIGH VOLTAGE!
TO AVOID THE RISK OF INJURY, ELECTRICAL SHOCK OR DEATH, THE FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN THEIR ABSENCE, WITH THE LATEST EDITION OF THE NATIONAL ELECTRIC CODE.
To ensure proper unit grounding, the ground wire should run from the furnace ground screw located inside the furnace junction box all the way back to the electrical panel. NOTE: Do not use gas piping as an electrical ground. To confirm proper unit grounding, turn off the electrical power and perform the following check.
1.Measure resistance between the neutral (white) connection and one of the burners.
2.Resistance should measure 10 ohms or less. This furnace is equipped with a blower door interlock switch which interrupts unit voltage when the blower door is opened for servicing. Do not defeat this switch.
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