Carrier Infinity 480CEN024 Installation Instruction page 15

thermistor toeliminate noise interference intemperature reading. If
there a re not t wospare wires a vailable incable, one wire may be
used toconnect thermistor toOAT screw t erminal 1and the other
lead o fthe thermistor can be wired t o24vac COM (C) wire. OAT
screw t erminal 1isthe top terminal marked with asmall nunaber 1
next tothe terminal strip.
_o o
Fig. 14 - HK42FZ021
A06026
HUMIDIFIER CONNECTIONS
The Infinity control board terminal marked HUM is provided for
low voltage (24 vac) control of a humidifier. No humidistat is
required as User Interface monitors indoor humidity. When
commanded to operate humidifier, the unit control will energize the
HUM output to turn humidifier on and de-energize HUM output to
turn humidifier off. Wire HUM and C terminals directly to
humidifier as shown in Fig. 12.
ELECTRONIC AIR CLEANER
Electronic Air Cleaner terminals are provided on the Infinity
Control Board (EAC- 1 and EAC-2). While these terminals can be
used to power a 230V EAC, it is recommended that any EAC be
installed per the EACs installation instructions and connected
separately to a standard 115V or 230V outlet with an airflow sensor
to control operation of the EAC.
PRE- START- UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Do not operate compressor or provide any electric power
to unit unless compressor terminal cover is in place and
secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant leak is suspected around compressor terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install lockout
tag.
b. Relieve and reclaim all refrigerant from system
using both high- and low-pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Use the Start-Up Checklist supplied at the end of this book and
proceed as follows to inspect and prepare the unit for initial start-up:
1. Remove access panel.
2. Read and follow instructions on all DANGER, WARNING.
CAUTION, and INFORMATION labels attached to. or
shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damage, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak.
c. Leak-test all refrigerant tubing connections using
electronic leak detector, or liquid-soap solution. If a
refrigerant leak is detected, see following Check for
Refrigerant Leaks section.
d. Inspect all field- and factory-wiring connections. Be
sure that connections are completed and tight.
e. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
f. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
n
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal inju W,
death or property damage.
Do not purge gas supply into the combustion chamber. Do not
use a match or other open flame to check for gas leaks.
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