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Installation
This booklet contains installation instructions and information on the thermostat and
wireless accessories. Separate installation instructions for the furnace or air handler
and outdoor AC condensing unit or heat pump are provided with the appropriate
equipment. This thermostat is designed exclusively for use with the ComfortNet com-
municating system.
Valid System Configurations
This control may only be used with certain system configurations. Valid system con-
figurations for which this control can be used are:
• A communicating air handler matched with a communicating outdoor AC
condensing unit.
• A communicating air handler matched with a communicating outdoor heat pump
unit.
• A communicating furnace matched with a communicating outdoor AC condensing
unit.
• A communicating furnace matched with a communicating outdoor heat pump unit.
• A communicating furnace matched with a non-communicating single stage AC
condensing unit.
Installing Thermostat
REMOVE AND INVENTORY ALL
1
COMFORTNET
™
COMPONENTS
NOTE: THE CTK04 CONTAINS THE THERMOSTAT, LITHIUM COIN CELL BATTERY,
WALL MOUNTING SCREWS AND ANCHORS, SYSTEM INSTALLATION GUIDE,
OPERATING MANUAL, TRANSFORMER AND A WIRING SET THAT INCLUDES
TWO TERMINAL BLOCKS AND WIRES.
REMOVE OUTDOOR UNIT
4
COVER AND 7-PIN
CONNECTOR
1.
Remove and inventory all ComfortNet components. The CTK04 contains the ComfortNet commu-
nicating thermostat, lithium coin cell battery, wall mounting screws and anchors, system installa-
tion guide, operating manual, transformer and a wiring set that includes two terminal blocks, two
sheet metal screws and wires.
2.
Carefully separate the thermostat body from the thermostat base.
3.
Place base at installation location and mark mounting hole locations on wall using base as a
template. See Thermostat Mounting section on next page for optimal mounting location.
4.
Drill mounting holes. Drill 3/16" holes for drywall and 7/32" holes for plaster.
5.
Attach base firmly to wall using two mounting screws. Leveling is for appearance only and will
not affect thermostat operation.
6.
Connect wires to terminal block on base.
7.
18 AWG solid wire is recommended.
8.
Push excess wire into wall and plug hole with a fire resistant material (such as fiberglass insula-
tion) to prevent drafts from affecting thermostat operation.
9.
Insert coin cell battery in the back of the thermostat.
10. Carefully line up the thermostat with the base and snap into place.
2
INSTALL HVAC COMPONENTS
AIR
HANDLER
AIR CONDITIONER
OR HEAT PUMP
CONNECT TO THE OUTDOOR UNIT
5
2-WIRE/TRANSFORMER
CONNECTION
ADDITIONAL TRANSFORMER
IS NOT REQUIRED FOR
INVERTER/VARIABLE SPEED
OUTDOOR COMMUNICATING
UNITS.
ADDITIONAL TRANSFORMER
IS REQUIRED FOR 2-STAGE
OUTDOOR COMMUNICATING
UNITS.
CTK04 ComfortNet™ Communicating Thermostat
3
GAS
FURNACE
AIR CONDITIONER
OR HEAT PUMP
6
CONNECT 2-WIRES TO
INDOOR UNIT
HIGH
LOW (24 VAC)
VOLTAGE
VOLTAGE
TRANSFORMER LOW
VOLTAGE CONNECTED
TO R AND C
TERMINALS
TRANSFORMER
CONNECT HIGH VOLTAGE TRANSFORMER LEADS TO L1
AND L2 MALE SPADE TERMINALS ON CIRCUIT BOARD.
DO NOT CONNECT R AND C BETWEEN THE INDOOR UNIT
AND OUTDOOR UNIT. SEE PAGE 5.
3
REMOVE 9-PIN CONNECTOR
FROM FURNACE OR AIR
HANDLER CONTROL
CONNECT 4-WIRES
FROM STAT AND
2 WIRES FROM
OUTDOOR UNIT
TERMINALS 1 & 2 ARE
COMMUNICATIONS
WIRES. THEY SHOULD
NEVER BE CONNECTED
TO THE 24 VAC R&C
P/N F0430679005
POWER SUPPLY
TERMINALS.
INSTALL THERMOSTAT ON INTERIOR WALL
I/O-CHTSTAT03 69-2688—11
M33487C
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