Honeywell CT52A - Manual (Page 3)

I i
SPIRIT LEVEL OR P L U M B BOB AMD LINE
REMOVING OLD
THERMOSTAT
(See illustration under step
4 to help you recognize the
heat anticipator.) Make a note
□ Begin by turning off
power to the
heating/cooling system at
the main fuse panel. Most
residential systems have a
separate switch box or
circuit breaker for
disconnecting power to the
furnace.
□ Remove cover of old
thermostat—cover
normally snaps off when
pulled firmly from the
bottom. If it resists, check
for a screw that locks the
cover on.
□ For CT50A, CT51A,
or CT52A installation,
before removing the old
thermostat from the wall,
ook at it carefully to locate
the heat anticipator
adjustment mechanism.
(See last illustration under
step 4 to help you
recognize the heat
anticipator.) Make a note
here I
I of that
anticipator setting for future
reference. The heat
anticipator pointer, if
adjustable, will be set at
one of a series of numbers
representing the (electrical)
current rating of the primary
control in your furnace. The
number will be one of the
following: .2, .4, .8, etc., or
0.2, 0.4, 0.8, etc. If no heat
anticipator/indication is
showing, do not be
concerned; move on to the
next step-
□ Loosen screws
holding thermostat
base to subbase or wall,
and lift away.
or subbase, if your
thermostat has more than 2
wires, as you disconnect
each wire, tape the end and
label it with the letter of the
terminal designation to
make reconnection to new
thermostat easier. Take
care that these wires do not
fall back into the wall
opening.
□
Disconnect wires
from old thermostat
□ Retain the old
thermostat for
reference purposes until
your new thermostat is
functioning smoothly.
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