Installation Instructions
Part Number 33CSZRP-06
IMPORTANT: Read entire instructions before starting
the installation.
PACKAGE CONTENTS
ITEM
QUANTITY
Universal Relay Pack
1
Screws
4
Wire Nuts
11
SAFETY CONSIDERATIONS
Read and follow manufacturer instructions carefully. Fol-
low all local electrical codes during installation. All wiring
must conform to local and national electrical codes. Im-
proper wiring or installation may damage relay pack.
Recognize safety information. This is the safety alert sym-
bol
. When the safety alert symbol is present on equip-
ment or in the instruction manual, be alert to the potential
for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety alert sym-
bol. DANGER identifies the most serious hazards which will
result in severe personal injury or death. WARNING signi-
fies a hazard which could result in personal injury or death.
CAUTION is used to identify unsafe practices which would
result in minor personal injury or property damage.
GENERAL
The universal relay pack is used in VVT
t
(variable volume/
variable temperature) systems as an interface between the
HVAC (heating, ventilation, and air conditioning) unit and
the damper actuator. The universal relay pack is used on Cool-
ing Only, Heating/Cooling, and Heat Pump units. The uni-
versal relay pack is not used in Monitor-Only applications.
The universal relay pack is also used for supplemental heat
and fan relays on zone controllers.
INSTALLATION
Step 1 — Relay Pack Location —
The relay pack
can be mounted either in the damper actuator or in an
accessory remote enclosure at a remote location not more
than 100 ft from the zone damper actuator.
The operating environment for the relay pack is 32 to
158 F (0° to 70 C) at a non-condensing humidity of 10 to
95%.
Step 2 — Wiring Requirements —
The universal
relay pack wiring has the following requirements:
All system wiring must be in compliance with all appli-
cable local and national codes.
All control, communication bus, and sensor wiring
should be color coded in conformance with Carrier
recommendations.
Each unused wire should be individually capped with a
wire nut. Do not leave bare exposed wires. Electric shock
can cause injury or death.
IMPORTANT: Do not run the thermostat network and
control wire in the same conduit for more than 5 ft.
Never run wires near any cable carrying AC voltage.
Interference to signal may result.
Do not ground the shielded wire in more than one
location. If the shield is grounded in two or more
locations, an electrical charge may form around the wire
and disrupt communication.
RELAY PACK TO HVAC UNIT — All wiring must be 4-,
7-, or 9-conductor, 18-gage, wire depending on application
and type of unit. The maximum distance between the HVAC
unit to the relay pack for 18-gage wire is 100 ft.
RELAY PACK TO FAN MIXING BOX OR SUPPLE-
MENTAL HEAT — All wiring must be 4- or 6-conductor,
18-gage, wire depending on application and type of unit. The
maximum distance between the mixing box or supplemental
heat to the relay pack for 18-gage wire is 100 ft.
RELAY PACK TO DAMPER ACTUATOR — A 2-conductor
power cable and 7-conductor relay connector cable are factory-
installed on the universal relay pack. If the universal relay
pack is being installed inside the actuator, no field-supplied
wiring is required.
If the universal relay pack is being installed in a remote
location, the 2-conductor power cable and 7-conductor relay
connector cable will need to be cut to add additional length
to the cable. Use 18-gage wire (standard or plenum rated) to
extend the factory-supplied cables. The maximum distance
between the relay pack and damper actuator for 18-gage wire
is 100 ft.
Step 3 — Install Relay Pack
DAMPER MOUNT
IMPORTANT: Before installing the relay pack make
sure the damper shaft will not come in contact with
the relay pack once it is installed inside the actuator
cover. If the shaft touches the relay pack, the damper
shaft must be cut to bring it flush with the sleeve of the
actuator.
33CS
Universal Relay Pack
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
11a 13a
PC 111
Catalog No. 533-342
Printed in U.S.A.
Form 33CS-27SI
Pg 1
5-98
Replaces: 690001
