Honeywell CT3650 - STEP 2. REMOVE OLD THERMOSTAT; Special Installations; Replacing a Clock Thermostat that has C or C1 Clock Terminals; Thermostat that has six or More Wires

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STEP 2. REMOVE OLD THERMOSTAT
❑ Test
y
our heatin
g
and coolin
g
s
y
stems to make sure the
y
work properl
y
. If either s
y
stem does not work, contact
y
our local heatin
g
/air-conditionin
g
dealer. To avoid compressor dama
g
e, do not operate the coolin
g
s
y
stem when
outdoor temperature is below 50°F (10°C).
❑ Turn off power to the s
y
stem at the furnace or the fuse/circuit breaker panel.
❑ Carefull
y
unpack
y
our new thermostat and wallplate. Save packa
g
e of screws, instructions, and receipt.
❑ Remove the cover from the old thermostat. If the cover does not snap off when pulled firml
y
from the bottom, check
for a screw or screws used to lock on the cover.
❑ Loosen the screw or screws holdin
g
the thermostat to the wallplate and lift the thermostat awa
y
.
❑ Disconnect the wires from the old thermostat. As
y
ou disconnect each wire, attach the enclosed labels with the old
terminal desi
g
nation. If there are onl
y
two wires, the
y
do not need to be labeled. Wrap the wires around a pencil as
shown to keep them from fallin
g
back into the wall.
Special Installations
Read this section if
y
ou are replacin
g
:
• Clock thermostat with separate wires for the clock.
• Thermostat with six or more wires connected to it.
• Thermostat in a heatin
g
onl
y
s
y
stem with three wires.
Replacing a Clock Thermostat that has C or C1 Clock Terminals
If
y
ou are replacin
g
a Hone
y
well Chronotherm® Thermostat,
y
ou ma
y
find one or two wires
g
oin
g
to the C or C1 clock
terminals on the Chronotherm wirin
g
wallplate. Do not allow them to touch, or
y
ou can dama
g
e the transformer.
Disconnect the wires and wrap them separatel
y
usin
g
electrical tape. Do not wrap them to
g
ether. Place the wires
where the
y
will not interfere with the operation of the new thermostat. Record the colors and terminal desi
g
nation
labels of the remainin
g
wires.
Replacing a Thermostat that has Six or More Wires
If there are six or more wires (excludin
g
clock wires attached to terminals),
y
ou probabl
y
have a variation of a
multista
g
e heat pump or other multista
g
e s
y
stem. This thermostat is not compatible with multista
g
e s
y
stems, so return
the product to the place of purchase. For information about which pro
g
rammable thermostats will work with
y
our
s
y
stem, call Hone
y
well Customer Relations Center, at 1-800-468-1502.
Replacing a Thermostat that has Three Wires
If
y
ou have three wires for a heatin
g
onl
y
s
y
stem and can operate the fan usin
g
the fan ON switch this thermostat works
with
y
our s
y
stem. However, some hot water (zoned) heatin
g
s
y
stems also have three wires. Your thermostat will work
onl
y
if
y
ou install an isolatin
g
rela
y
on these s
y
stems. For details, call
y
our local heatin
g
and/or coolin
g
contractor.
WIRES THROUGH
WALL OPENING
M5136