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A suitable strain relief should be used at the point the wires exit the furnace casing. Copper conductors shall be used. Line voltage wires should conform to temperature limitation of 63 ° F (35 ° C) rise. Wire and circuit breaker sizing shall be based on the ampacity of the furnace electrical components plus the amps for all installed accessories (1.0 amps total for EAC and HUM). Ampacity can be determined by using the NEC or CEC. NOTE: Furnace will not have normal operation if line polarity is reversed. Check ALL field and control connections prior to operation. Furnace must be installed so the electrical components are protected from water and connected to its own separate circuit. J-Box Relocation N8MPN/L Models The J-box is installed in blower compartment on left side of casing. An alternate J-box location on right side can be used. 1. Remove bag containing two hole plugs and two self-tapping screws from loose parts bag in blower compartment. 2. Remove and discard two screws holding J-box to casing. 3. Move large hole plug from right to left J-box location. 4. Move J-box to alternate location and attach using two self- tapping screws from bag. 5. Apply two hole plugs from bag at left J-box location. 6. Position all wires away from sharp edges and moving parts. Do not pinch J-box wires or other wires when reinstalling blower compartment door. *8MPN/L Models The J-box is installed in the burner compartment on left side of casing. An alternate J-box location on right side can be used: 1. Remove and save two screws holding J-box to casing. 2. Move large hole plug from right to left J-box location. 3. Clip wire tie holding J-box wires. 4. Move J-box to alternate location and attach using two screws removed from left side location. Position all wires away from hot surfaces, sharp edges, and moving parts. Do not pinch J-box wires or other wires when reinstalling burner compartment door. Thermostat Thermostat location has an important effect on the operation of the furnace. Follow instructions included with thermostat for correct mounting and wiring. Low voltage connections to furnace must be made on terminal board to furnace control. (See Figure 19) If cooling is used, the Y from the thermostat must be connected to the control board Y to energize cooling blower speed. Set thermostat heat anticipator in accordance with the Technical Support Manual. Heat anticipator setting will need to be measured if 24VAC humidifier is installed. Measure currentin series from R to W at thether mostat. Be sure 24VAC humidifier is wired up to control. Allow furnace to operate for 2 minutes before recording the AC amperage reading. Set anticipator on thermostat to recorded value. Optional Equipment All wiring from furnace to optional equipment MUST conform to local codes or, in the absence of local codes, the applicable national codes. Install wiring in accordance with manufacturer's instruc tions. Humidifier/Electronic Air Cleaner The furnace is wired for 115 VAC humidifier and/or electronic air cleaner connection. REDUCED FURNACE LIFEHAZARD Failure to follow caution instructions may result in reduced furnace life. Do NOT exceed 115V/1.0 amp. maximum current load for both the EAC terminal and the HUM terminal combined. HUMIDIFIER -The 24VAC HUM is energized when the pressure switch closes on a call for heat. The HUM (115VAC) is en ergized when the inducer is energized. ELECTRONIC AIR CLEANER -EAC is energized when there is a blower speed call, except is NOT energized when blower operates in the hard-wired continuous fan mode. 441 01 261302 [_ Electrical Connections 115V.60Hz. Gr_nd Thermostat I !,I L ]__ Low Voltage Terminal Board NOTE: 115 VAC/6OHz/single-phase Operating voltage range*: 127 VAC max, 104 VAC min. * Permissible limits of voltage at which unit will operate satisfactorily Furnace Control The furnace control is preset at the factory with ON delay of 30 seconds in the heating mode. The blower OFF timing is preset at 140 seconds. If desired, the fan OFF delay can be reset to obtain the longest delay times while still maintaining comfort levels. See "Furnace Wiring Diagram". 10. Ductwork and Filter (Upflow/Horizontal) CARBON MONOXIDE POISONING HAZARD. Failure to properly seal duct could result in death or personal injury. Do NOT draw return air from inside a closet or utility room where furnace is located. Return air duct MUST be sealed to furnace casing. Duct Connections This furnace may be installed in only a bottom or side return-air duct application. Return air duct connections through the back of the furnace is NOT permitted. Upflow ONLY: Side return-air duct connections cutting out the embossed area shown in Figure hole is provided at each furnace side duct location ting the opening. Side duct connections are NOT zontal flow applications. can be made by 21. A plugged to help start cut- permitted in hori- Upflow and Horizontal Flow: Bottom return-air duct connections can be made by removing the knockout panel in ...

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