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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: 45
o
F to 85
o
F [7
o
C to 29
o
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.
1 PREPARATION
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
80
70
60
50
80
70
60
50
3 [83]
9
32
AUTO ON
EM. HEAT HEAT OFF COOL
EM. HEAT AUX. HEAT
3 [101]
31
32
4 [119]
11
16
3
[83]
9
32
2 [52]
1
16
3
16
[5]
9
32
1
[33]
3
8
[10]
1
2
[13]
11
32
[9]
3
8
[10]
M7306