Replacing Existing Thermostat - Robertshaw 9515 User Manual

Features
• Multi stage heating and cooling control
• Zone system compatible as a master thermostat
• Auxiliary heat
• Fahrenheit/Celsius display option
• Adjustable from 45°F (7°C) to 90°F (32°C)
• Accuracy within ± 1 degree
• Adjustable 1st stage temperature differential: 1°-3°,
2nd stage temperature differential: 2°-6° F
• Automatic heating shutdown if temperature exceeds 90°F (32°C)
• Battery free memory storage

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 (Figure 1).
3. Label wires per Table 1.
Table 1
Old Label
R, V-VR or VR-R
Y, Y1 or M
O or R
B
F or G
Y2
W2 or W-U
C, X or B
W1 or W
*NOTE: T
HIS THERMOSTAT REQUIRES A
New Label
R
Y1
O
B
G
Y2
W2
C
W1
24V
COMMON WIRE FOR PROPER OPERATION
2
Description
24 VAC, Return
1st Stage Cooling
Circuit
Reversing Valve,
(Cooling Mode)
Reversing Valve
(Heating Mode)
Fan Control Relay
2nd Stage Cooling
Circuit
2nd Stage Heating
Control
24 VAC, Transformer
Common Side
1st Stage Heating
Circuit
.