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As a single-piece unit, all required wiring must be brought to
the ECM for connection to the terminal strip. In two-piece con-
figuration, the DM can be mounted in the space while the ECM
may be mounted near the equipment, always within the building
space and not outdoors.
Connection from the DM to the ECM requires only two
wires. All other control wires are connected to the ECM from the
HVAC (heating, ventilation, and air conditioning) equipment.
This configuration results in a slimmer profile and locates the
ECM containing the switching relays away from the occupied
space so relay clicking will not be heard.
Installer should determine whether control will be installed as
single-piece or two-piece. In single-piece configuration, as many
as 14 wires may need to run to wall mounting location for con-
nection to the control. In two-piece configuration, the DM and
ECM are connected by two wires.
Outdoor Temperature Sensor —
temperature sensor is not included with the thermostat. It is
available as an accessory (part no. 33ZCSENOAT). Plan instal-
lation so that 2 wires can be run from equipment control module
to an outdoor location, preferably on the north side of the build-
ing or refer to Installation Instructions included with the outdoor
temperature sensor for simplified connection. Details are provid-
ed in sensor instructions.
Remote Indoor Temperature Sensor —
mote temperature sensor can be used where it is desirable to in-
stall the control in a limited access location while measuring the
temperature in the space. The remote sensor can be used as a
stand-alone device or averaged with a local sensor(s).
NOTE: Carrier sensor part no. 33ZCT55SPT would be used for
remote space sensing averaging. Sensors must be used as a sin-
gle sensor, 4 sensors, or 9 sensors, with total sensor wiring not to
exceed 1,000 ft. The 33ZCSENSAT sensor would be used for
supply and return sensing.
INSTALLATION
CAUTION
Failure to follow the recommended wiring practices could
result in damage to the thermostat and/or property.
CAUTION
Mount the ECM (equipment control module) in a suitable
indoor location, either near or on the indoor equipment.
The ECM should not be mounted to indoor ductwork or
below any other controls or equipment (for example, a
humidistat or humidifier).
Failure to follow this practice could result in damage to
equipment and/or property.
Thermostat Location —
mounted:
• approximately 5 ft from the floor
• close to or in a frequently used space, preferably on an
inside wall
• on a section of wall without pipes or ductwork
• where temperature operating limits are within –67 to
257 F (–55 to 125 C)
The
outdoor
A re-
The thermostat should be
• where humidity operating range is within 0 to 95% rela-
tive humidity, non-condensing
• always secured to the wall with wire nuts
The thermostat should NOT be mounted:
• close to a window, on an outside wall, or next to a door
leading to the outside
• where exposed to direct light and heat or any other tem-
perature-radiating object which may cause false readings
• close to or in direct airflow from supply registers or return
air grille in areas with poor air circulation
• outside of the building exposed to the elements
Wiring Requirements
• All system wiring must be in compliance with all applica-
ble local and national codes.
air
• All sensor wiring should be color coded in conformance
with the standard recommendations.
• Never remove the thermostat board from the plastic hous-
ing. Doing so could warp and damage the components on
the board.
• The sensor wiring must be completely separated from the
thermostat or any other control wiring and must not be in
the same conduit as high voltage wiring. Refer to the sen-
sor documentation for specific wiring instructions.
• Wiring specifications from the thermostat to the sensor are
22 AWG (American Wire Gage) unshielded for a distance
of less than 100 ft. It is recommended for lengths greater
than 100 ft to use shielded 22 AWG wire for increased
noise immunity. Wire length should not exceed 1,000 ft.
• For wiring the control module to the equipment, the dis-
tance should be no more than 100 ft when using 22 AWG
wire, and no more than 300 ft when using 18 AWG wire.
The rule is the same for wiring the control module to the
display module: no more than 100 ft when using 22 AWG
wire, and no more than 300 ft when using 18 AWG wire.
Two-Piece Installation —
perform the following procedure.
1. Turn off all power to equipment.
2. If an existing thermostat is being replaced:
a. Remove existing control from wall.
b. Disconnect wires from existing thermostat, one at a
time. As each wire is disconnected, record the wire
color and terminal marking.
c. New or additional wires may be needed to accom-
modate added humidity outputs.
d. Discard or recycle old control.
3. Remove mounting plate from back of display module by
pressing the two tabs on the bottom edge and pulling away.
See Fig. 1. Figure 2 shows the mounting plate removed
from the module.
4. Route wires through large hole in mounting base. Level
mounting base against wall (for aesthetic purposes only,
the display module does not need to be leveled for proper
operation) and mark wall through 2 mounting holes. See
Fig. 3.
5. Drill two
3
/
-in. mounting holes in the wall where marked.
16
The control module may be mounted to a standard junction
box, if desired. Make sure the hole pattern on the control
module mounting base matches the junction box mounting
holes.
2
For two-piece installation,
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