CTC Union 43057 Owner's Instructions

HEAT PUMP
DIGITAL THERMOSTAT
Model 43057 Owners Instructions

IMPORTANT INFORMATION

1.This thermostat is designed to work on the fol-
lowing systems:
• Single-Stage Heat Pump
• Multi-stage Heat Pump (up to 2 heating and 2
cooling)
2.Temperature Range This thermostat can be set be-
tween 45°F and 95°F (7°C and 35°C). However, it will
display room temperatures from 30°F to 99°F (0°C and
37°C). "HI" will be displayed if the temperature is higher
than 99°F (37°C), and "LO" will be displayed if the tem-
perature is lower than 30°F (0°C).This thermostat will
automatically cut off in Heat mode if the temperature
rises above 95°F (35°C), and automatically cut off in
Cool mode if the temperature drops below 40°F (4°C).
3.Compressor Protection This thermostat provides a
3.5 minute delay after shutting off the cooling system
before it can be restarted. This feature will prevent
damage to your compressor caused by rapid cycling.
It does not prevent a rapid compressor restart due to
short power outages.
INSTALLATION
What You Need
This thermostat includes two #8 slotted screws and two
wall anchors for mounting. To install your thermostat,
you should have the following tools and materials.
• Slotted screwdriver(s)
• Small Philips screwdriver
• Hammer
• Electric drill and 3/16" bit
Remove Old Thermostat
CAUTION! Turn off the power to the heat pump
system at the main power panel or at the heat
pump system.
IMPORTANT: Do not remove any wiring from the ex-
isting thermostat before reading these instructions
carefully. Wires must be labeled prior to removal.
Remove existing thermostat cover and thermostat. See
Figure 1. Some thermostats will have screws or other
locking devices that must first be removed. Once the
wall mounting plate is exposed, look for wires.
If wires are not visible, they may be connected to the
back of the wallplate. Again, look for screws, tabs, etc.
Some models have doors that open to expose wires
and mounting screws. See Figure 1.
Figure 1
Wire Labeling
• CAUTION! TURN OFF POWER TO THE HEAT
PUMP SYSTEM BEFORE YOU ATTEMPT TO
ACCESS THE THERMOSTAT'S WIRING.
• IMPORTANT! BEFORE DISCONNECTING ANY
WIRES FROM THE EXISTING THERMOSTAT,
APPLY THE PROVIDED SELF-ADHESIVE LABELS
TO THE WIRES.
• Use the information in Table 1 below and the
provided adhesive labels to label the wires. IGNORE
THE COLOR OF THE WIRES since these do not
always comply with the standard.
If the terminal letter . . .then mark the
on the existing wire with adhesive
thermostat is. . .
R, V-VR, or VR-R
Y, Y1, or M
Y2
W1, W2, or W-U
E
G or F
O or R
B
L or X
C, X, or B
Table 1
• After labeling the wires, disconnect them from the
existing thermostat terminals.
• Remove existing wallplate. To make sure wires do
not fall back into wall opening, you may want to
secure them to the wall.
• If the hole in wall is larger than necessary for wires,
seal the hole with insulating material so that no hot or
cold air can enter the back of the thermostat from the
wall. This air could cause a false thermostat reading.
• A wiring diagram is included in the Wiring Diagram
section at the end of these instructions.
Mount Wallplate
• Remove the wallplate from the thermostat by pressing
the release tab on the bottom of the thermostat. See
Figure 2.
Figure 2
• Position wallplate on wall and pull existing wires
through the large opening, then level for appearance.
If the existing mounting holes from the old wallplate
line up with the slots in the new wallplate, then use
the exisitng holes. If the exisitng holes do not line up
with the slots in your new wallplate, then mark the
wall for holes for the provided plastic anchors.
• Drill holes with 3/16" bit and gently tap anchors into
the holes until flush with wall.
• Reposition wallplate, pulling wires through large
opening. Insert provided mounting screws into wall
anchor and tighten. See Figure 3.


 


Figure 3
Connect Wires and Mount Thermostat to
Wallplate
• Match and connect the labeled wires to the
appropriate coded terminal screws on the wallplate.
See Figure 4. Ignore any wires which may be present,
but which were not connected to the old thermostat.
label
R
Y1
Y2
W2
E
G
O
B
• Be sure to tighten the terminal screws securely, as
L
a loose wire could cause operational problems with
your system or thermostat.
C (Required)
• Push excess wire back into the hole to prevent
interference when installing the thermostat to the
wallplate.
• Set the System Switch to "off", and the Fan Switch to
"auto".
• On the back of the thermostat are the System Set-Up
Switches. See Figure 5. If the heat pump system has
an electric auxiliary system, then slide the #1 switch
to HE position. If the heat pump system has a gas
auxiliary system, then slide #1 switch to the HG
position.
To set up the LCD display to show the temperature
in Fahrenheit, slide the #2 switch to the F position.
To set up the LCD display to show the temperature in
Celsius, then slide the #2 switch to the C position.
System Set-Up
Release Tab
• Insert the tabs on top of the thermostat body into the
slots at the top of the wallplate. Press the bottom of
the thermostat body into the snap on the bottom of
the wallplate. (NOTE: Do not force the thermostat
onto the wallplate, as the terminal pins may be
damaged. If it does not snap properly, the thermostat
may not work.)
• Turn on power to the heat pump system.
• If the wiring to the thermostat has been correctly
connected, and if the thermostat has been correctly
mounted to the wallplate, then the LCD Display
should show the indoor room temperature.

THERMOSTAT CONTROLS

• Open the thermostat's front cover. See Figure 6.
Terminal Screws
Figure 4
Switches
Figure 5
Figure 6
Form No. 41982 03/10/06