Prepare For Installation; Remove The Old Thermostat - Honeywell Round CT87A Installation Instructions Manual

CT87A,B,J ROUND® THERMOSTAT
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Prepare for installation

1. Carefully unpack your new thermostat; rough handling may affect its
2. Gather these tools:
3

Remove the old thermostat

1. Turn off power to the heating/cooling system at the main fuse/circuit
2. Remove the cover of your old thermostat. You may need to unscrew
3. Locate the heat anticipator adjustment scale and lever on the old
4. Unscrew and remove the old thermostat wallplate from the wall, but
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accuracy. Save your receipt and identify the following parts:
• CT87 Thermostat
• Screws: two 1-in. sheet metal screws, two 1/2-in. binding head
screws, and two 1/4-in. round head screws
• Wallplate (CT87A) or subbase (CT87B, CT87J)
• Cover ring (select models only). Necessary if installing on an
outlet box. Optional if installing directly on the wall; can be used to
hide wall marks.
• These Installation Instructions and the Installation Quick Guide.
• Wiring labels
Required Tools
• Flat blade
screwdriver
• Spirit level
breaker panel.
the cover if it is locked on.
thermostat (Fig. 1).
Fig. 1. Mercury switch location.
TYPICAL LOCATION OF A
MERCURY SWITCH IN
A THERMOSTAT
do not disconnect the wires.
Optional Tools
• Hand or power drill with 1/16-in. 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:
OLD THERMOSTAT
ANTICIPATOR
If you cannot find the heat
SCALE
anticipator setting on the old
LEVER
thermostat, you can use a
standard setting for your type of
system when you reach Step 8 of
this installation.
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