Aprilaire 8336 user manual Replacing Existing Thermostat, Features

Features

•Multi Stage heating and cooling control.

•Zone system compatible as a master thermostat.

•Multi-Colored LED indicators for system status.

•Low battery indicator.

•Fahrenheit/Celsius display option.

•Adjustable from 45°F (4°C) to 90°F (32°C).

•Accuracy within ± 1 degree.

•Adjustable temperature differential: 1-3 degrees F.

•Automatic heating shutdown if temperature exceeds 90°F (32°C).

Replacing Existing Thermostat

1.Turn off power to heating and cooling system.

2.Remove cover of old thermostat to expose wires. Do not disconnect wires. (Fig. 1)

3.Label wires per Table 1.

Table 1

Old Label	New Label	Description
R, V-VR or VR-R	R	24 VAC, Return
Y, Y1 or M	Y	Stage 1 Cooling/Heating
		Circuit
O or R	O	Reversing Valve,
		(Cooling Mode)
B	B	Reversing Valve
		(Heating Mode)
F or G	G	Fan control relay
Y2	Y2	2nd Stage Cooling
		Circuit
W1 or W2 or W-U	W2	2nd Stage Heating
		Control
L or X	L	System Monitor LED
E	E	Emergency Heating
		Circuit
C, X or B	C	24 VAC, Transformer
		Common Side

*NOTE: This thermostat requires a 24V common wire for proper operation.

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