General; Temp System Components; Installation; Thermostat Placement - Carrier 33CS Installation, Service, And Troubleshooting Instructions

GENERAL

Single zone products are popular and cost effective in air-
conditioning systems for many small to medium sized com-
mercial buildings.
The Carrier Comfort System TEMP System is designed to
be compatible with the full line of Carrier single-zone heating
and cooling units.
The TEMP System is a communicating network of thermo-
stats designed to keep comfort at a maximum and maintenance
at a minimum. To coordinate the operation of multiple units,
the TEMP System programmable thermostats are interfaced
through a communication bus. The communication bus is a
simple, 3-wire, shielded cable installed between the thermo-
stats. One thermostat is equipped with an electronic timeclock
that can broadcast time to all other thermostats. Each thermo-
stat can be programmed for its own individual occupied and
unoccupied times and temperature.
The Carrier TEMP System consists of more than one ther-
mostat networked together and can be expanded to meet what-
ever number of single zone systems are required.
The TEMP System thermostat maintains proper tempera-
tures by controlling the on and off times of the HVAC
equipment.
Each thermostat is responsible for controlling the tempera-
ture conditions in its space. Each thermostat will maintain its
own independent occupied/unoccupied time schedule and heat-
ing/cooling set points. This allows multiple TEMP System
thermostats to maintain different temperature ranges at differ-
ent times.
NOTE: The Comfort System TEMP system thermostat is not
compatible with a TEMP Generation II Enhanced or Pre-
Enhanced device. The Carrier Comfort system will not support
Enhanced or Pre-Enhanced devices.
TEMP System Components —
System consists of one or more thermostats that communicate
by way of a communication bus. Each thermostat controls a re-
lay pack which, in turn controls the HVAC unit.
Each thermostat can be connected to others to provide com-
munication between thermostats. Only one thermostat per sys-
tem is required to have a timeclock that will broadcast time to
the rest of the system.
TEMP SYSTEM THERMOSTAT — The 33CSTMT-01 (with
timeclock) and 33CSTM--01 (without timeclock) TEMP Sys-
tem Thermostats have the following features:
• controls temperature to user defined set points
• maintains 7 days a week occupied/unoccupied schedule
• eliminates external timeclocks, manual override timer, night
low limit thermostat, battery backup or unit time guard
• operates with 3 system switches for supply air fan and the
unit heating and cooling stages.
TIMECLOCK — The electronic timeclock is built into the
33CSTMT-01 thermostat and displays hours, AM or PM, and
the day of the week.
RELAY PACK — The Relay Pack has the following features:
• serves as interface between thermostat, HVAC unit, and any
external sensors
• powered by 24 vac/10 va, supplies thermostat with 10 vdc.
The Carrier TEMP
2

INSTALLATION

Thermostat Placement —
lation by determining where the thermostat will be located. 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 ground. 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.
Refer to the mounting instructions provided with the TEMP
system thermostat for more information on wall installation.
The thermostat may also be mounted in a remote location
with the use of an optional remote room sensor. See Fig. 1 for
dimensions of TEMP system thermostat with timeclock. See
Fig. 2 for dimensions of TEMP system thermostat without
timeclock.
Wiring Requirements —
the TEMP System are:
THERMOSTAT TO THERMOSTAT NETWORK — Wiring
must be 18 gage, 3-conductor, shielded, stranded wire, color
coded (RED, BLACK, and GREEN), plenum rated if required,
and long enough to run from thermostat to thermostat in daisy-
chain configuration. At one end of the daisy-chain, the shield
must be connected to the chassis ground. The other end
must be taped back. Between the ends, the shield must be wire-
nutted together. Tape the shield after it has been wire-nutted.
Do not ground the shielded wire in more than one location.
If the shield is grounded in 2 or more locations, an electri-
cal charge may form around the wire and disrupt thermo-
stat communication.
THERMOSTAT TO RELAY PACK — Wiring must be
18 gage, 5-conductor, shielded, stranded wire, color coded
(RED, WHITE, BLUE, YELLOW, and GREEN), plenum
rated if required, and long enough to run from thermostat to
relay pack.
RELAY PACK TO HVAC UNIT — Wiring must be 6-, 7-,
or 8-conductor wire, depending on HVAC unit, and sized to
run from relay pack to the wiring terminals of the HVAC unit.
A separate transformer should be used. Do not use the unit
transformer.
NOTE: Do not run the thermostat network and the control wire
in the same conduit for more than 5 ft. Never run wires near
any cable carrying AC voltage. For further wiring information,
consult the local Carrier distributor.
Power required to each relay pack is 24 vac/ 10 va. Typical
wiring is 18 gage thermostat wire (standard or plenum cable).
Power to the relay pack may be wired to the HVAC unit trans-
former if of sufficient va capacity. The maximum load of a re-
lay contact is 24 vac, 1 amp. A short in the field wiring or
HVAC unit will cause non-warranty damage to the relay board.
Test before attaching to relay pack.
Call the local Carrier representative if more information is
needed about wiring the TEMP System thermostat.
Begin the thermostat instal-
The wiring requirements for