Friedrich 42, 24, 60, 18 Thermostat Mounting and Wiring A. Thermostat Location, Thermostat Wiring

3)THERMOSTAT MOUNTING AND WIRING A. Thermostat Location

Locate the thermostat about 5 ft. above the floor in an area with good circulation at average indoor temperature.

Do not mount the thermostat where it may be affected by:

•Drafts or dead-air spots behind doors and in corners.

•Hot or cold air flow from ducts.

•Radiant heat from sun or appliances.

•Concealed pipes or chimneys.

•Unheated (uncooled) areas behind thermostat, such as an outside wall.

B. Thermostat Mounting and Wiring

The thermostat is a precision instrument and was carefully adjusted at the factory. Handle it carefully.

CAUTION: Disconnect the power supply before beginning installation of the thermostat to prevent electrical shock or equipment damage. Do not short across the thermostat terminals. This can burn out the thermostat anticipator.

All wiring for the thermostat circuit must comply with NEC, state and local codes. Use No. 20 AWG color-coded, insulated (35°C minimum) wire. If the thermostat is located more than 100 ft. from the unit (as measured along the control voltage wires), use No. 18 AWG color-coded wires to avoid excessive voltage drop.

1.In replacement applications, check the existing thermostat wiring for cracked or frayed insulation. Replace any wiring in poor condition. All wiring must comply with local codes and ordinances.

2.Run wiring (if necessary) to the location. Thread the wires through a hole in the packing material saved in Step 2. Connect the wires to the terminals on the back of the thermostat. (See Figure 11.)

3.Push the excess wire back through the hole and plug any opening with packing material to prevent drafts that may affect thermostat performance.

4.Loosely secure the thermostat to the wall with screws through the two mounting holes in the middle of the thermo- stat.

5.Level the thermostat. Tighten the two mounting screws.

6.Replace the thermostat cover.

C. Wire Thermostat Cable to Unit Terminal Strip

Attach thermostat wires to low-voltage terminal block on left side of control box in locations indicated in Figures 1, 2 & 3.

Figure 11

Thermostat Wiring

G	R	Y		B		W2		E		C
Fan		Compressor			Auxiliary				Common
						Heat
	24V		Reversing				Emergency
			Valve					Heat

G R Y B W2 E X

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