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Honeywe
I I
Heating, Air Conditioning or
Heating/Air Conditioning
Thermostats
INSTALLATION INSTRUCTIONS
The CT50A is for most gas and oil
heating-only systems.
The CTSOC is for most electric
air
condmoning-only systems.
The CTSlA is
for
most gas,
oil,
or electric
healing/electric air conditioning systems
The CT53A
is
for
millivoltage heating systems.
Do-it-yourself
models
CT5OA,C; CT51A; CT53A
CPfilA
shown
YOUR
NEW
THERMOSTAT
Your new Honeywell CT50A
Heating Thermostat will replace
most 15 to 30
V,
2-wire heating
system thermostats. The CT50A
is suitable only for gas or oil
heating systems (NOT for air
conditioning, heating/air
conditioning, heat pump or
electric heating systems).
Your new CT5OC Cooling
Thermostat will replace most 15
to 30 V, 3-wire air conditioning
system thermostats (NOT for
heating, heating/air conditioning
or heat pump systems).
Your new CT51 A
Heating/Cooling Thermostat will
replace most 15 to 30 V, 4-wire.
heating/ cooling system
thermostats. The CT51A is
suitable for gas, oil or electric
heating/electric air conditioning
systems (NOT for heat pumps).
Your new CT53A Heating
Thermostat is suitable for 250,
500
or 750 millivolt
(mV)
heating
systems only.
PREPAI
REMOL
WIRE A
TROUB
Proper installation of your
new thermostat will occur
if you follow instructions STEP-
BY-STEP. It is recommended
that as you read, understand and
complete each step, you check
it off with pencil
or
pen.
Check thermostat
suitability lor your home's
system by reviewing YOUR NEW
If you are unsure about wiring
procedures, please call a
qualified service technician for
assistance.
THERMOSTAT section, above.
FLAT BLADE
SCREWDRIVER
HAND OR POWER
DRILL WITH
3/16 INCH
DRILL BIT
WIRE CUTTER/STRIPPER
OR SHARP KNIFE
SPIRIT
LEVEL
OR PLUMB BOB AND LINE
11.95%
and discard the
under the cover.
Save package of screws
and instruction pages.
anticipator adjustment
Disconnect wires
from old thermostat 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.
Keep the old
thermostat
for
reference purposes until
your new thermostat is
functioning smoothly.
WiRE AND
MOUNT
For CTSOA:
Connect each
rom the wall to
either terminai on the
back of the thermostat.
Tighten
t h e
screws.
For CT50C
or
Cf51 A:
Connect wires
from the wall to matching terminals on back of thermostat.
Tighten the screws.
NOTE: If terminal designations on old thermostat do not match
those on new thermostat, refer to chart below.
system, and callnot
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Related Manuals for Honeywell CPFILA
Summary of Contents for Honeywell CPFILA
- Page 1 Save package of screws and instruction pages. 11.95% from the wall to matching terminals on back of thermostat. Tighten the screws. NOTE: If terminal designations on old thermostat do not match those on new thermostat, refer to chart below.
- Page 2 For CT50A or CTSIA installation fan is controlled Turn it on before removing the old and adjust your present thermostat from the wall, look at thermostat so the heat carefully to locate i h e heat comes on, while observing...
- Page 3 The primary control is usually valve, zone valve, or a retay or burner control with the thermostat wires connected to it. For electric heat, you need to add the n relay current, usually 0 2 to 0.4 A.
- Page 4 TROUBLESHOOTING Your Honeywell thermostat requires little NOTE: If your system is heating-only or air conditioning-only, disregard sections not applicable to your system. SYMPTOM PROBLEM No heat System switch at OFF or COOL Position. Blown fuse or tripped circuit breaker Furnace power switch is on QFF.