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Table 1
Old Terminal 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)
BBReversing 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
EEEmergency Heating
Circuit
C, X or B C 24 VAC Transformer
Common Side
*NOTE: THIS THERMOSTAT REQUIRES A 24V COMMON WIRE FOR PROPER OPERATION.
Recycling Thermostat
If this thermostat is replacing a thermostat that contains mercury in a
sealed tube, do not place your old thermostat in the garbage. Contact your
local waste management authority for instructions regarding proper dis-
posal of the thermostat. If you have any questions, call Robertshaw tech-
nical support at 1-800-445-8299.
Step 2: Installing Model 9520 Thermostat
NOTE: FOR NEW INSTALLATIONS, MOUNT THERMOSTAT ON INSIDE WALL, 4-5 FEET ABOVE THE FLOOR.
DO NOT INSTALL BEHIND A DOOR, IN A CORNER, NEAR AIR VENTS, IN DIRECT SUNLIGHT, OR NEAR ANY HEAT
OR STEAM GENERATING FIXTURES
. INSTALLATION AT THESE PLACES WILL AFFECTS THERMOSTAT OPERATION.
1. Turn off power to the heating
and cooling systems.
2. Place COOL-OFF-HEAT-EM
in OFF position.
3
COOL-OFF-HEAT-EM AUTO - ON
AUX
>
>
CHECKEMER
COOL-OFF-HEAT-EM
AUTO - ON