Specifications

GROUNDING GUIDELINES — It is very important that
ground loops are not introduced into the system. Ground loops
are eliminated by electrically connecting the shield to the
equipment ground at only one point. Never connect the com-
munication bus shield drain wire to any electrical connec-
tion of any device on the bus. Connect one end of the shield
to a solid chassis or building ground, as close as possible to
the main grounding point for the building. Do not connect
the shield drain wire to grounding points used for lightening
protection or ductwork.
Do not ground the shielded wire in more than one lo-
cation. If the shield is grounded in 2 or more locations,
an electrical charge may form around the wire and dis-
rupt thermostat communication.
THERMOSTAT TO THERMOSTAT — Wire must be
plenum rated if required and long enough to run from ther-
mostat to thermostat in daisy-chain configuration. One end
of the shield must be connected to the chassis ground. The
other end must be taped back. Between the ends, the shields
must be wire-nutted together.
THERMOSTAT TO DAMPER ACTUATOR OR RELAY
PACK — Wiring must be 18 gage, 5-conductor, shielded,
stranded wire, color coded (RED, WHITE, BLUE, YEL-
LOW, GREEN), plenum rated if required and long enough
to run from thermostat to damper actuator or relay pack.
RELAY PACK TO HVAC UNIT — Wiring must be seven-
conductor wire, and sized to run from relay pack to the wir-
ing terminals of the HVAC unit.
Power required to each damper actuator or relay pack is
24 vac/10 va. For CHR-06 relay packs controlled from a
zone damper, 24 vac, 5 va power is required. In VVT mode,
the zone damper must have a minimum of 24 vac at 20 va.
Typical wiring is 18-gage thermostat wire (standard or ple-
num cable). The maximum load of a relay contact is 24 vac,
1 amp. A short in the field wiring will cause non-warranty
damage to the relay board. Test before attaching to relay pack
or damper actuator.
Call your local Carrier representative if more information
is needed about wiring the VVT System or the monitor
thermostat.
VVT Relay Packs — Each VVT system requires a re-
lay pack to interface the monitor thermostat to the HVAC
unit. Based on the application, select the correct relay pack
for the system.
MONITOR-ONLYAPPLICATIONS — A Monitor-Only ap-
plication can use either a TSR-01 or 33CSUCE-06 relay pack.
The TSR-01 relay pack is used for indoor mounting envi-
ronments. The 33CSUCE-06 relay pack is used for outdoor
mounting environments. It is also used in units having a W-973
controller. Both relay pack models offer 2-stage heat and cool
and ON/OFF fan control.
MONITOR MODE APPLICATIONS —AVVT Monitor Mode
application can use a CHR-03, CHR-06, 33CSZRP-06, or
CHR-06W relay pack. For units requiring only one stage of
heating and cooling with fan operation and no reversing valve
a 3-relay (CHR-03) relay pack should be used. For units re-
quiring up to 2 stages of heating and cooling with fan, re-
versing valve, economizer, and auxiliary relay operation a
6-relay (CHR-06 or CHR-06W) relay pack should be used.
The CHR-06W relay pack models can also be used in units
having a W-973 controllers.
The Universal Relay Pack (33CSZRP-06) is used to re-
place any application using CHR-03, CHR-06, or
CHR-06W relay packs.
NOTE: Factory-installed relay packs are available for some
Carrier rooftop units. Refer to the Apollo control installation
instructions for information on the factory-installed Apollo
control in the rooftop unit.
Wiring Connections for Monitor Thermostat
Electric shock can cause injury or death. Ensure power
to the HVAC unit has been disconnected before wiring.
To wire the thermostat, perform the following:
1. Connect the communication bus and power wiring to the
wiring connection block of the thermostat. See Fig. 4.
2. Push the wires back into the wall.
3. Align the terminal board with the right track in the back
plate housing. See Fig. 5. The ribbon strip side of the ter-
minal block should be away from the wall. Push the ter-
minal block into the track until about
1
⁄ 2 -in. is left
protruding.
4. Align the ribbon cable from the thermostat circuit board
with the ribbon connector on the terminal board and push
gently to connect.
5. Push the terminal board fully into backplate until the latch
clicks into place.
6. Place the foam backing on the circuit board. Slide the
circuit board under the back plate securing bars. DO NOT
CREASE RIBBON CABLE.
7. Align thermostat board with alignment pin. Gently pull
down on the thermostat latch and press firmly until the
circuit board snaps into place.
8. If optional locking thermostat cover is purchased, insert
locking clip on the inside of the thermostat cover. Push
firmly into place.
9. Insert tabs on thermostat cover into top slots on the back-
plate. Press firmly on the bottom of the thermostat cover
to snap cover into place.
NOTE: If the optional locking thermostat cover was in-
stalled, the key must be inserted into the locking device
to remove front cover.
Wiring Connections for VVT Monitor
Applications
WIRE THERMOSTATTO DAMPER BOARD — The damper
board thermostat wiring bundle contains the wires required
to connect the thermostat to the damper actuator. See Fig. 6.
Wire nut the RED, WHITE, BLUE, YELLOW and GREEN
wires of the thermostat to the damper board wiring bundle.
WIRE SENSORS TO DAMPER BOARD — The damper
board sensor wiring bundle contains the wires required to
connect the sensors. See Fig. 7. Wire nut the filter status sen-
sor to the H wiring bundle. Wire nut the humidity sensor to
the H and V wiring bundles. The humidity sensor and filter
status sensor cannot be used at the same time; do not wire
both sensors to the H wiring bundle. Wire nut the remote
duct temperature sensor to the R wiring bundle. Wire nut the
fan status switch to the V wiring bundle. Wire nut the OAT
(outdoor air temperature) sensor to the O wiring bundle of
the bypass damper.
NOTE: For IAQ sensor wiring and installation, see Indoor-
Air Quality Sensor Installation section on page 5.
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