Carrier SYSTXCC4ZC01 Air Conditioner User Manual

NOT required for regular use. Traditionally, the LAT/HPT sensors
were required for temperature / equipment monitoring. The Infin-
ity Zoning System does not require these because the User
Interface algorithms will perform temperature and airflow man-
agement without use of these sensors. If desired, one or both
sensors may be used in monitoring leaving air temperature and / or
indoor coil air temperature. Consideration and / or flexibility will
now permit using one of these sensors in the return air duct giving
the dealer an option to view both entering and leaving air
temperature at the User Interface. If applied, connect sensors to the
LAT / HPT terminals (See Fig. 9, System Wiring, for connection
to Infinity Damper Control). LAT is monitored by both AC and HP
systems. LAT and HPT are both monitored only in HP systems.
To install - Locate LAT sensor in main supply trunk after heating
and cooling coil and before first branch. The LAT sensor is radiant
shielded to prevent heat from affecting correct air temperature.
1. Drill a 1/4 inch hole at location in supply trunk where sensor
will be installed.
2. Insert sensor in hole and use as a template to mark the 2
mounting holes.
3. Drill two 1/16 inch holes to accept No. 6 screws through
pre-drilled holes in duct temperature sensor back plate.
4. Use two No. 6 sheet metal screws to mount duct temperature
sensor to unit.
5. Connect sensor to 2-conductor wire using provided wire nuts.
The HPT sensor (in heat pump applications) measures the tem-
perature of the air leaving the indoor coil. The sensor is installed
downstream of the indoor coil but before the electric heaters. It can
be installed through the wall of the fan coil or may be located
entirely inside the fan coil near the blower inlet. Anchor firmly in
place with cable ties so that it cannot interfere with the blower
wheel (See Fig. 9).
LED INDICATORS Under normal operation, the Yellow and
Green LEDs will be on continuously (solid). If the Infinity Damper
Control does not receive communications with the User Interface,
the Green LED will not be on. If there are faults present, the
Yellow LED indicator will blink a two-digit status code. The first
digit will blink at a fast rate, the second at a slow rate.
16 = Communication Failure
24 = Damper Fuse Failed
45 = Board Failure
46 = Low Input Voltage
FUSE A 1-amp automotive type fuse is used to protect the
Infinity Damper Control from over current on the damper drive
outputs. If this fuse fails, damper wiring should be inspected for
shorts. Also, no more than five damper motors should be con-
nected to a single damper output. Fuse should always be replaced
with an identical 3 amp automotive fuse.
If you have more than four zones, a second Infinity Damper
Control must be used and both dip switch settings on the second
board supporting zones 5 through 8 must be moved to the right.
The ABCD bus connector must be wired between both Infinity
Damper Controls.
Step 7Transformer Requirements
The Infinity Zoning System has a lower power draw from the
system transformer than previous controls. It also drives only 2
zone damper outputs at a time. As a result, up to 8 zones each with
up to 5 dampers, plus a smart sensor, can be handled without
increasing the size of the system transformer or adding a second
zoning transformer.
Use of the transformer provided in the furnace or fan coil is
recommended without change in all zoning applications except
those having a System Access Module (SAM). The SAM requires
a separate transformer.
For those who still want more transformer capacity, a 60 VA
system transformer may be used in place of the supplied 40 VA
Step 8System Start-Up
Follow the system start-up process outlined in the Infinity Zone
Control Installation Instructions for details.