Honeywell CT70A - Manual (Page 3)

3 69-0846
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.
5
CHECK 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 10 o F [6 o C] above room
temperature. Heating should start and the fan should run.
Move the set point lever about 10
o F [6 o 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
50
o F [10 o 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 10
o F [6 o C] below
room temperature. Cooling and fan should start (see
NOTE above). Move the set point lever about 10
o F [6 o 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.
6
SETTING 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.