Honeywell CT70A Manuel utilisateur

CT70A

Heat Pump Thermostat

Your Honeywell Thermostat

Your new Honeywell CT70A Heat Pump Thermostat

provides low voltage (24 Vac) control of two-stage heating

and one-stage cooling in heat pump systems, using

manual changeover. Light-emitting diodes (LEDs) provide

emergency heat and auxiliary heat indication.

Recycling Notice

This control contains mercury in a sealed tube. Do not

place control in the trash at the end of its useful life.

Installation Instructions

Thermometer Scale Range: 45o F to 85o F [7o C to 29o C].

Electrical Ratings: 24 to 27 Vac.

Do-It-Yourself Models

M3375

If this control is replacing a control that contains mercury in

a sealed tube, do not place your old control in the trash.

Contact your local waste management authority for

instructions regarding recycling and the proper disposal of

this control, or of an old control containing mercury in a

sealed tube.

If you have questions, call Honeywell Inc. at

1-800-468-1502.

1PREPARATION

Your Honeywell thermostat should be properly

installed if you follow these 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 for your home’s system

by reviewing the ratings listed on the front of these

instructions and reviewing the CT70 Heat Pump Thermo-

stat Wiring Guide enclosed.

Make certain that your home’s heat pump system is

working, especially if it has been inoperative for a

length of time. If the system does not work, contact your

local heating dealer for assistance.

Carefully unpack your new thermostat. Save

packages of screws, instructions, receipt and proof-

of-purchase.

2 THERMOSTAT MOUNTING DIMENSIONS

S.M. • 8-94 • Printed in U.S.A. • • ©Honeywell Inc. 1994 • Form Number 69-0846

M3375

3 [83]

AUTO ON

EM. HEAT HEAT OFF COOL

EM. HEAT AUX. HEAT

3 [101]

4 [119]

[83]

2 [52]

16 [5]

[33]

[10]

2[13]

32 [9]

8[10]

M7306

69-0846 2

3REMOVE OLD THERMOSTAT

WARNING

Begin by turning off power to the heat pump at the

main service panel.

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.

Before removing the old thermostat from the wall,

look at it carefully to locate the heat anticipator

adjustment mechanism. (See illustration to help you

recognize the heat anticipator.)

M8449

MERCURY

SWITCH

ANTICIPATOR

SCALE

ANTICIPATOR

SETTING LEVER

Make a note here of that anticipator setting for

reference in setting the anticipator on your new thermostat.

The heat anticipator pointer, if adjustable, will be set at one

of a series of numbers representing the current rating for

the primary control of your heat pump. 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 for now; go on to the next step.

Loosen screws holding thermostat base to wall and

lift away.

Disconnect wires from old thermostat. As you

disconnect each wire, tape the end and label it with

the enclosed wiring labels to make reconnection to new

thermostat easier.

Check the old insulation for cracks, nicks or fraying,

and apply high quality plastic tape where necessary

for adequate insulation.

Retain the old thermostat for reference purposes

and until your new thermostat is functioning

smoothly.

M8447

BACK OF DEVICE

GY1

(HOT) L2

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED.

WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT. LED ALSO INDICATES COMPRESSOR MALFUNCTION.

X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION.

COMPRESSOR

CONTACTOR

FAN RELAY

EM. HEAT

RELAY

CHANGEOVER

RELAY (HEAT)

HEAT RELAY 1

CHANGEOVER

RELAY (COOL)

AUX. HEAT

RELAY

SYSTEM

MONITOR

4WIRE AND MOUNT NEW THERMOSTAT

This thermostat can be mounted directly to the wall

or on a horizontal outlet box. Choose the method

that best fits your installation.

Grasp the thermostat cover at the top and bottom

with one hand. Pull outward on bottom edge of the

cover until it snaps free of the thermostat base. Carefully

remove and save the packing material surrounding the

mercury switches.

Run wiring (if necessary) to the location. If the

wiring is plastered into the wall, make a hole next to

the cable and loosen the wires so that they can be pushed

back into the wall later. Thread wires through the hole in

packing material saved above. Connect the wires to the

terminals on the back of the thermostat according to the

labels you placed on the wires or as shown in the wiring

diagram.

369-0846

Push the excess wire back through the hole and

plug any opening with packing material to prevent

drafts that may affect thermostat performance.

Loosely secure the thermostat to the wall or outlet

box with screws through the two mounting holes at

the middle of the device. The sheetmetal screws included

with the thermostat are designed for use in plaster walls

that do not need anchors.

Exactly level the thermostat using a spirit level or

plumb line. An incorrectly leveled thermostat will

cause inaccurate temperature control. Tighten the two

mounting screws at the middle of the device. Install two

screws in top mounting holes and tighten.

Replace the thermostat cover.

5CHECK OUT THERMOSTAT

Turn on the power to the heat pump system.

To check heating, move the system switch on the

thermostat to HEAT and the fan switch to AUTO.

Move the set point lever to about 10o F [6o C] above room

temperature. Heating should start and the fan should run.

Move the set point lever about 10o F [6o C] below room

temperature. Heating and fan should shut off.

NOTE: To prevent compressor short cycling, a minimum-

off timer may be included to prevent the compressor

from starting for up to five minutes from when the

thermostat last turned off the compressor, or from when

the system first received power.

Check cooling only if outdoor temperature is at least

50o F [10o C]. To check cooling, move the system

switch on the thermostat to COOL and the fan switch to

AUTO. Move the set point lever about 10o F [6o C] below

room temperature. Cooling and fan should start (see

NOTE above). Move the set point lever about 10o F [6o C]

above room temperature. Cooling and fan should shut off.

To check fan, move the system switch to OFF, and

the fan switch to ON. The fan should run continu-

ously. Move the fan switch to AUTO. In this position, the

fan operates in response to the thermostat in both heating

and cooling.

6SETTING THERMOSTAT

Move the set point lever to the desired control point

on the temperature scale.

Move the system switch and fan switch to the

desired operating positions.

The system switching positions control the system

operation as follows:

EM.HT.: Emergency heat relay is energized. Cooling

system is off. Compressor is de-energized. Fan runs on

call for heat if fan switch is in AUTO position. EM.HT.

LED is on continuously.

HEAT: Heat pump equipment is providing warm air to the

living space.

OFF: All heating/cooling equipment is de-energized.

COOL: Heat pump equipment is providing cool air to the

living space.

The fan switching positions control the fan operation as

follows:

AUTO: The fan operates in response to the thermostat in

both heating and cooling.

ON: The fan operates continuously.

69-0846 4

7TROUBLESHOOTING

Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following:

Symptom Problem Corrective Action

Compressor doesn't

provide warm air. Equipment has compressor

protection time delay. Wait five minutes and check for heat.

System switch at OFF or COOL

position. Move switch to HEAT position.

Blown fuse or tripped circuit

breaker. Replace fuse or reset circuit breaker.

Heat pump power switch is at

OFF. Switch to ON.

Improper connections to

thermostat. With power to furnace at OFF, tighten all mounting and

terminal screws. Repair frayed or broken wires.

Defective thermostat. (Here's

how you know: Remove the

thermostat from the wall.

Disconnect wire from W1

terminal. Touch W1 wire to

terminal R. The thermostat is

defective if the compressor

starts.) Some systems have a

time delay, so allow five

minutes. See step 5.

Exchange the thermostat (see Warranty).

Other. Contact a qualified service technician for assistance.

Compressor will not

stop delivering warm

air.

Turn temperature setting lever

all the way down. Heater should start to cool within minutes. If not, turn off

power at the main service panel, and contact qualified

service technician.

Thermostat setting

and thermometer

reading disagree.

Thermostat is not level. Recheck the thermostat position on the wall. Use level to

make sure it is level. See step 4.

Thermostat affected by drafts or

radiant heat. Contact a qualified service technician to change the

location. The thermostat should be about 5 ft [1.5m] above

the floor and on an inside wall.

Compressor doesn't

provide cool air. Equipment has compressor

protection time delay. Wait five minutes and check for cool.

System switch is in OFF or

HEAT position. Move switch to COOL position.

Blown fuse or tripped circuit

breaker. Replace fuse or reset circuit breaker.

Compressor switch (located

outdoors) is at OFF. Move switch to ON position.

Improper connections to

thermostat. With power to heat pump OFF, tighten all mounting and

terminal screws. Repair broken wires.

Defective thermostat. (Here's

how you know: Remove the

thermostat from the wall.

Disconnect wire from Y1

terminal. Touch Y1 wire to

terminal R. The thermostat is

defective if the compressor

starts. Some systems have a

time delay, so allow at least five

minutes.) See NOTE in step 5.

Exchange the thermostat. See Warranty.

Other. Contact service technician for assistance.

Limited One-Year Warranty

Honeywell warrants this product to be free from defects in the workmanship or materials, under normal use and service, for

a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is

defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option) within a reasonable period of time.

If the product is defective,

(i) return it, with a bill of sale or other dated proof of purchase, to the hardware or home center store from which you

purchased it, or

(ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction,

and mail it, postage prepaid, to the following address:

Honeywell Inc, RG Department in Canada: Honeywell Limited/Honeywell Limitée

1050 Berkshire Lane 740 Ellesmere Road

Plymouth, MN 55441-4437 Scarborough, Ontario M1P 2V9

This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that

the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.

Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL

NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL

DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR

IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion of incidental or

consequential damages, so this limitation may not apply to you.

THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION

OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do

not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary from state to state.

If you have any questions concerning this warranty, please write our Customer Assistance Center, Honeywell Inc.,

P.O. Box 524, Minneapolis, MN 55440-0524 or call 1-800-468-1502, Monday-Friday, 7:00 a.m.-5:30 p.m. Central time. In

Canada write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 740 Ellesmere Road, Scarborough,

Ontario M1P 2V9.

569-0846

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