Specifications

CONTENTS (cont)
Page
NETWORK ACCESSIBLE VARIABLES ...............45
TROUBLESHOOTING PROCEDURES ...............46-48
General Operating Problems ......................46
Equipment Operation Problems ....................46
INDEX ......................................49,50
GENERAL
The monitor thermostat operates in a VVTt (Variable Vol-
ume and Temperature) system. The VVT system allows a
single-zone heating/cooling unit to operate as a multiple-
zone system. The conditioned space is divided into zones.
Each comfort zone is monitored by a zone controller. The
monitor thermostat monitors the operation of its own zone
and of each associated zone controller and determines sys-
tem operation from information received from each device
that it controls.
NOTE: The Comfort System VVT monitor thermostat will
not be compatible with a VVT Generation II Enhanced or
Pre-Enhanced device. The Carrier Comfort System (CCN)
VVT system will not support Enhanced or Pre-Enhanced
devices.
The monitor thermostat can be configured to run in 3 dif-
ferent ways. When the monitor thermostat is used in a VVT
monitor system, it is connected to a damper actuator and con-
trols its own damper and its system devices. When the moni-
tor thermostat is used in a VVT monitor-only system, it is
connected to a relay pack and controls its system devices
(but not its own damper). In construction applications it is
used to provide heat or cooling before the system is fully
operational. In all cases, the monitor controls the HVAC unit.
NOTE: When the monitor is configured to control a zone
damper, it does not operate as a pressure independent zone.
The monitor can only operate in pressure dependent mode.
INSTALLATION
Thermostat Placement —
Begin the thermostat in-
stallation by determining where the thermostat will be lo-
cated. In most cases, this will be pre-determined by the building
plans.
The thermostat should be located on an interior wall, about
5 ft from the floor. The thermostat should be located away
from direct sunlight, drafts, or interior heat sources which
may influence temperature readings.
The thermostat may also be mounted in a remote location
with the use of an optional remote room sensor.
To mount the thermostat, perform the following:
1. Cut a hole in the wall for the terminal board housing. The
hole should be 1
3
⁄ 4 in. by 1
3
⁄ 4 inches. See Fig. 1.
NOTE: A 2-in. by 4-in. electric box mounted horizon-
tally may be used instead of cutting the hole.
2. Remove the cover from the thermostat/controller. Care-
fully remove the circuit board from the backplate of the
thermostat/controller. Line up the backplate with the hole
in the wall. Push the protruding part of the backplate into
the hole. Pull the thermostat/controller wires out through
the backplate.
3. Attach backplate to wall with screws provided.
See Fig. 2 for dimensions of monitor thermostat with time-
clock. See Fig. 3 for dimensions of monitor thermostat with-
out timeclock.
Wiring Requirements — The monitor thermostat can
either be wired to a relay pack (VVT monitor-only appli-
cations) or to a damper actuator (VVT monitor applica-
tions). Depending on the type of system, use the correct in-
stallation procedures. The wiring requirements for the monitor
thermostat are:
GENERAL — During installation, it is impossible to predict
the potential for electrical noise or interference from radio
frequency signals and their impact on the performance of
the VVT System. Carrier therefore recommends using shielded
wire as a standard for all installations. Properly installed shielded
wire is generally not as susceptible to induced noise (AC
voltage) from lights, motors, or AC power wiring. The fol-
lowing guidelines must be observed:
• All wiring must conform with all applicable local and
national electrical codes.
• All control, communication bus, and sensor wiring should
be colored-coded in compliance with a consistent color
scheme. To achieve this consistency, the following color-
code system is recommended for the network bus:
Signal Type
Conductor Insulation Color
(+) Red
(ground) Green
(−) Black
If a cable with a different color scheme is selected, a simi-
lar color-code system should be adopted to simplify in-
stallation and troubleshooting.
• All wiring should be shielded no. 18 gage wire except the
wiring from the relay pack to the HVAC equipment (these
wires can be unshielded). The 3-wire communication net-
work bus wiring and 5-wire control cable from the con-
trolling device must be in separate jacketed cable.
• All system wiring must be within one building. Never con-
nect devices between two or more buildings directly.
CONDUIT GUIDELINES — The communication bus 3-wire
cable and the controlling device 5-wire cable cannot be run
together in a conduit exceeding 5 ft. All AC wiring must be
in a separate conduit. Wiring for other building systems should
not be run in the same conduit as VVT communication bus
or 5-wire cable wiring.
Fig. 1 — Mounting Hole Dimensions
2