Honeywell CT5OC User Manual

Honeywell

Heating, Air Conditioning or

Heating/Air Conditioning

Thermostats

INSTALLATION INSTRUCTIONS

The CT50A is for most ^as and oil

heating-on(y systems.

The CT50C is lor most electric air conditio/irng-only systems.

The CT51A is lor most gas, oil, or electric heating/electric air condillorring systems,

The CT53A is for milMvoltage heating systems,

DO'it-yourself models

CT50A,C; CT51A; CT53A

PREPARATION

Proper installation of your

new thermostat will occur

if you follow instructions STEP-

□

BY-STEP. tt is recommended that as you read, understand and complete each step, you check I ^ I it off with pencil or pen.

CT51A shown

If you are unsure about wiring procedures, please calf a qualified service technician for assistance.

X—

SPIPIT LEVEL OR PLUMB BOB AUO LINE

YOUR NEW THERMOSTAT

Your new Honeywell CT50A Heating Thermostat will replace most 15 to 30 V, 2-wire healing system thermostats. The CT50A is suitable only for gas or oil heating systems (NOT lor air conditioning, heating/air conditioning, heat pump or

electric heating systems). Your new CT50C Cooling

Thermostat will replace most 15

Chec)( thermostat

suitability for your home’s

system by reviewing YOUR NEW

□

THERMOSTAT section, above.

га

to 30 V, 3'Wire air conditioning

system thermostats (NOT for

heating, heating/air conditioning or heat pomp systems}.

Your new CT51A Heating/Cooling Thermostat will

replace most 15 tg 30 Y, 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.

Assemble tools required,

as shown left, r

Make certairt that your burner/air conditioner (where applicable) áre working,

□

especially if they hâve been

inoperative for any length of time. If either does rot work, contact your local heating/air conditioning dealer. Do NOT operate the air conditioning system if outdoor temperature is below 30® F [10° C],

Carefully unpack your

new thermostat. Remove

and discard the packing insert

□

under the cover.

Save package ol screws

□

and instruction pages.

CON

PREPAI

THERM

REMONi

WIRE A

CHECK

THERM

TROUB

RECALI

THER

, . FE

anticipator adjustment

mechanism, (See last i illustration tinder step 4 to 'i help you recognize the heat

ahticipator.) Make a note i here 1 [ of that

anticipator setting for future

reference. The heat anticipator pointer, if adjustable, will be set at one ota series of numbers representing the (electrical)

, current rating of the pritnary ! control of your system In

amps. The number will range from 0,1ft to 1,0. If no heat antidi pato r/ i n dr cat¡0 n (s

,i showing, do hot be

cortcerried; move on to the

next step.

Loosen screws

I ■ holding thermostat

¡ báselo Buitoase qr wall, and

Lliftaway,

....

j.". ■

Disconnect wires

from old thermostat or

subbase. If your therrnostat

□

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

□

i your new thermostat is

functioning smoothly.

WIRE AND

MOUNT

THERMOSTAT

For CT50A: Connect each

wire from the wall to

□

either terminal on the back of the thermostat. Tighten the screws.

For CT60C or CT51A:

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.

OLD THERMOSTAT

TERMINAL MARKED e or F Fan

YorC

! Wor H Heati ng W

HC, V, VC or В

1 HH. M, VR, 4. A or R

i'flitriing CT51A for ELECTRIC furni

need to instali a jumper between t

and 2: If your old subbaSe ts a Q5v : Q634G, you need the jumper. If in I base number, see section 3. If jurr i not installed, the furnace could 6v ; hazard. Use T ft gauge insulated I installing, :

FUNCTION

Cooling Y

Power You have a 5-wire

:i, Power

NEW THERMOSTAT

TERMINAL MARKED

system, and cannot use this thermostat; we recommend a CT87B instead.

ace systems, you may herrrrostat termirials J;;

9G, Q539U,: Q634D or ' dbUbt аЬо1й cfld siib-

ipef is needed and is

érhéat; саиШд a firè::

fire; strip ends before.

CONTENTS STEP

PREPARATION 1 THERMOSTAT FEATURES REMOVING OLD THERMOSTAT WIRE AND MOUNT NEW THERMOSTAT 4 CHECK OUT THE THERMOSTAT 5 THERMOSTAT SETTING TROUBLESHOOTING RECALIBRATE THERMOMETER 8

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Ptinted in U.S.A.

Form Number 6S-S51J—2

THERMOSTAT

FEATURES

ostat.

not match

MOSTAT

MARKED

5-wire I cannot rmostat; lend a ead-

fou may binais 1 I 634D or jid sub i and is;i ig a fire s before

■. ■: :■

Terminal Screws (CT51A shown)

Top Mounting Hole (the-rmOstat to wail or outlet box)

Adjustable Heat Artiejpator Setting Lever (CT50A, CT51A only)

Mounting ClipE itor cover)

Fan Switch fCTSIA only)

Systeni Switch (CT51A only)

Bottom Mounting Hole

Temperature Setting Leuer

For CT53A:

□

Connect wires to R and W for

750 mV systems. Connect to R and Y

tor 250 or 500 mV systems. Tighten the

screws.

Push excess wire back into wall and plug hole with nonflammable

insulation to prevent drafts from affecting

thermostat operation.

Grasp the thermostat cover at the top and bottom with one hand. Pull Outward on the bottom edge

□

of the thermostat cover until it snaps

free of the thermostat base.

Fasten thermostat to wall or vertical outlet box with □ screw through the top mounting hole.

□

See step 2 for hole location.

REMOVING OLD

THERMOSTAT

II you have an electric furnace, you

need to determine how your

□

fan is controlled. Turn it on

and adjust your present

thermostat so the heat comes on, while observing

whep tbe ian comes on it the fan comes on immediately you need to add the jumper noted in section 4 between terminals 1 & 5, If there is a noticeable detay before the fan comes on, there is no need to add the jumper because your furnace controls the far.

Begin by turning off power to the heating/air conditioning 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 otf when

pulled firmly from the bottom. If it resists,

□

check for a screw that locks the cover or. For CT50A or CT51A installation,

before removing the old thermostat from the wall, look at it

□

carefully to locate the heat

Place a bubble level or plumb line against the ther mostat to find the ievel position. Start a screw in the center of the bottom mounting hole. Move the temper

□

ature setting lever if necessary to uncover the mounting

hole,

a..rK.:,

‘ Bubble Level

Plumb Line

Plumti Bob or

■ Weight

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