York GF9S*DH UIM-B-0607, Supply Voltage Connections, Low Voltage Control Wiring Connections

268890-UIM-B-0607

SUPPLY VOLTAGE CONNECTIONS

IMPORTANT: The power connection leads and wiring box may be relo- cated to the left side of the furnace. Remove the screws and cut wire tie holding excess wiring. Reposition on the left side of the furnace and fas- ten using holes provided.

1.Provide a power supply separate from all other circuits. Install overcurrent protection and disconnect switch per local/national electrical codes. The switch should be close to the unit for conve- nience in servicing. With the disconnect or fused switch in the OFF position, check all wiring against the unit wiring label. Refer to the wiring diagram shown in Figure 41.

2.Remove the screws retaining the junction box cover. Route the power wiring through the opening in the unit into the junction box with a conduit connector or other proper connection. In the junc- tion box there will be three wires, a Black Wire, a White Wire and a Green Wire. Connect the power supply as shown on the unit-wir- ing label on the inside of the blower compartment door or Figure 10. The black furnace lead must be connected to the L1 (hot) wire from the power supply. The white furnace lead must be connected to neutral. Connect the green furnace lead (equipment ground) to the power supply ground. An alternate wiring method is to use a field provided 2” (5.08 cm) x 4” (10.2 cm) box and cover on the outside of the furnace. Route the furnace leads into the box using a protective bushing where the wires pass through the furnace panel. After making the wiring connections replace the wiring box cover and screws.

3.The furnace's control system requires correct polarity of the power supply and a proper ground connection. If the power supply polar- ity is reversed, the control board will flash 9 times. The furnace will not operate until the polarity is corrected. Refer to “Furnace Diag- nostics” section of the “User’s Information, Maintenance, & Ser- vice Manual” provided with this furnace.

BLOWER

COMBUSTIONCOMPARTMENT

AIR

	VENT PIPE
CLASS 2 SYSTEM
CONTROL WIRING	IGNITION
TO THERMOSTAT	MODULE

TRANSFORMER

(BLK) LI (HOT)
(WHT) N
(GRN)GND	JUNCTION
	BOX

FIGURE 10: Electrical Wiring

LOW VOLTAGE CONTROL WIRING CONNECTIONS

Install the field-supplied thermostat by following the instructions that come with the thermostat. With the thermostat set in the OFF position and the main electrical source disconnected, connect the thermostat wiring from the wiring connections on the thermostat to the terminal board on the ignition module, as shown in Figure 11. Electronic thermo- stats may require the common wire to be connected as shown with the dashed line in Figure 11. Apply strain relief to thermostat wires passing through cabinet. If air conditioning equipment is installed, use thermo- stat wiring to connect the Y and C terminals on the furnace control board to the yellow and brown wires on the condensing unit (unit out- side). Refer to Figure 11.

IMPORTANT: Set the heat anticipator in the room thermostat to 0.45 amps. Setting it lower will cause short cycles. Setting it higher will cause the room temperature to exceed the set points.Some electronic thermo- stats do not have adjustable heat anticipators. They may have other type cycle rate adjustments. Follow the thermostat manufacturer's instructions.

The 24-volt, 40 VA transformer is sized for the furnace components only, and should not be connected to power auxiliary devices such as humidifiers, air cleaners, etc. The transformer may provide power for an air conditioning unit contactor.

For additional connection diagrams for all UPG equipment refer to “Low Voltage System Wiring” document available online at www.upgnet.com in the Product Catalog Section.

Unitary Products Group 11