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CT87A,B,J ROUND® THERMOSTAT
2
Prepare for installation
1. Carefully unpack your new thermostat; rough handling may affect its
accuracy. Save your receipt and identify the following parts:
• CT87 thermostat
• Screws: two 1-inch sheet metal screws, two 1/2-inch binding head
• Wallplate (CT87A) or subbase (CT87B, CT87J)
• Cover ring (select models only). Necessary if installing on an
• These Installation Instructions and the Installation Quick Guide.
• Wiring labels
2. Gather the tools listed below:
3
Remove the old thermostat
1. Turn off power to the heating/cooling system at the main fuse/circuit
breaker panel.
2. Remove the cover of your old thermostat. You may need to unscrew
the cover if it is locked on.
3. Locate the heat anticipator adjustment scale and lever on the old
thermostat (Fig. 1).
Fig. 1
TYPICAL LOCATION OF A
MERCURY SWITCH IN
A THERMOSTAT
4. Unscrew and remove the old thermostat's wallplate from the wall, but
do not disconnect the wires.
69-0274-5
screws, and two 1/4-inch round head screws
outlet box. Optional if installing directly on the wall; can be used to
hide wall marks.
Required tools
• Flat blade
screwdriver
• Spirit level or plumb
bob and line
OLD THERMOSTAT
ANTICIPATOR
SCALE
LEVER
Optional tools
• Hand or power drill with 1/16-inch
drill bit
• Wire cutter/stripper or sharp knife
• Pencil
In the box below, record the
number that the adjustment lever
points to. This is the current (amp)
rating of your heating system.
MERCURY
SWITCH
Current setting:
If you cannot find the heat
anticipator setting on the old
thermostat, you can use a
standard setting for your type of
system when you reach step 8 of
this installation.
M20206
2
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