Honeywell CT70A Thermostat User Manual

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CT70A  
Heat Pump Thermostat  
Installation Instructions  
Thermometer Scale Range: 45 F to 85 F [7 C to 29 C].  
Electrical Ratings: 24 to 27 Vac.  
o
o
o
o
Do-It-Yourself Models  
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.  
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.  
Recycling Notice  
This control contains mercury in a sealed tube. Do not  
place control in the trash at the end of its useful life.  
If you have questions, call Honeywell Inc. at  
1-800-468-1502.  
1
PREPARATION  
Your Honeywell thermostat should be properly  
installed if you follow these instructions step-by-step.  
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.  
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.  
Carefully unpack your new thermostat. Save  
packages of screws, instructions, receipt and proof-  
of-purchase.  
2
THERMOSTAT MOUNTING DIMENSIONS  
1
1
1
6
1
2
[13]  
4
[119]  
31  
3
3
8
3
[101]  
2
[10]  
1
9
32  
11  
32  
2
[52]  
3
[83]  
[9]  
16  
3
8
10]  
[
8
7
6
0
9
1
32  
[
33]  
8
7
6
5
0
0
0
0
0
0
9
3
[
32  
50  
83]  
EM. HEAT HEAT OFF COOL  
AUTO ON  
EM. HEAT AUX. HEAT  
3
[
5]  
16  
M7306  
S.M. • 8-94 • Printed in U.S.A. •  
• ©Honeywell Inc. 1994 • Form Number 69-0846  
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3
REMOVE OLD THERMOSTAT  
Make a note here  
of that anticipator setting for  
WARNING  
Begin by turning off power to the heat pump at the  
main service panel.  
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.  
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.  
Loosen screws holding thermostat base to wall and  
lift away.  
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.)  
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.  
MERCURY  
SWITCH  
Check the old insulation for cracks, nicks or fraying,  
and apply high quality plastic tape where necessary  
for adequate insulation.  
ANTICIPATOR  
SCALE  
Retain the old thermostat for reference purposes  
and until your new thermostat is functioning  
smoothly.  
ANTICIPATOR  
M8449  
SETTING LEVER  
4
WIRE AND MOUNT NEW THERMOSTAT  
This thermostat can be mounted directly to the wall  
or on a horizontal outlet box. Choose the method  
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.  
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.  
L1  
(HOT) L2  
1
CHANGEOVER  
RELAY (COOL)  
SYSTEM  
MONITOR  
FAN RELAY  
4
X
L
B
W2  
3
2
R
EM. HEAT  
RELAY  
G
O
Y1 W1  
E
AUX. HEAT  
RELAY  
CHANGEOVER  
RELAY (HEAT)  
BACK OF DEVICE  
HEAT RELAY 1  
1
2
3
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED.  
COMPRESSOR  
CONTACTOR  
WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT. LED ALSO INDICATES COMPRESSOR MALFUNCTION.  
X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION.  
M8447  
69-0846  
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Push the excess wire back through the hole and  
plug any opening with packing material to prevent  
drafts that may affect thermostat performance.  
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.  
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.  
Replace the thermostat cover.  
5
CHECK OUT THERMOSTAT  
Check cooling only if outdoor temperature is at least  
o
o
5
0 F [10 C]. To check cooling, move the system  
Turn on the power to the heat pump system.  
switch on the thermostat to COOL and the fan switch to  
o
o
To check heating, move the system switch on the  
thermostat to HEAT and the fan switch to AUTO.  
AUTO. Move the set point lever about 10 F [6 C] below  
room temperature. Cooling and fan should start (see  
o o  
NOTE above). Move the set point lever about 10 F [6 C]  
above room temperature. Cooling and fan should shut off.  
o
o
Move the set point lever to about 10 F [6 C] above room  
temperature. Heating should start and the fan should run.  
o
o
Move the set point lever about 10 F [6 C] below room  
temperature. Heating 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.  
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.  
6
SETTING THERMOSTAT  
Move the set point lever to the desired control point  
on the temperature scale.  
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.  
Move the system switch and fan switch to the  
desired operating positions.  
The system switching positions control the system  
operation as follows:  
The fan switching positions control the fan 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.  
AUTO: The fan operates in response to the thermostat in  
both heating and cooling.  
ON: The fan operates continuously.  
3
69-0846  
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7
TROUBLESHOOTING  
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 Move switch to HEAT position.  
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  
Exchange the thermostat (see Warranty).  
minutes. See step 5.  
Other.  
Contact a qualified service technician for assistance.  
Compressor will not  
stop delivering warm all the way down.  
air.  
Turn temperature setting lever  
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 Contact a qualified service technician to change the  
radiant heat.  
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.  
Move switch to COOL position.  
Replace fuse or reset circuit breaker.  
Move switch to ON position.  
System switch is in OFF or  
HEAT position.  
Blown fuse or tripped circuit  
breaker.  
Compressor switch (located  
outdoors) is at OFF.  
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.  
Exchange the thermostat. See Warranty.  
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.  
Other.  
Contact service technician for assistance.  
69-0846  
4
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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  
050 Berkshire Lane  
Plymouth, MN 55441-4437  
in Canada: Honeywell Limited/Honeywell Limitée  
740 Ellesmere Road  
1
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.  
5
69-0846  
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