Standard Connection
Run the low-voltage leads from the thermostat, through the inlet
hole, and into unit low-voltage splice box.
Locate eight (six for 460V 3-phase) 18-gage wires leaving
control box. These low-voltage connection leads can be identified
by the colors red, green, yellow, brown, blue, and white (See Fig.
10). Ensure the leads are long enough to be routed into the
low-voltage splice box (located below right side of control box).
Route leads through hole in bottom of control box and make
low-voltage connections (See Fig. 10). Secure all cut wires, so that
they do not interfere with operation of unit.
HIGH VOLTAGE
POWER LEADS I c- .....
(SEE UNITWlRING I
LABEL) <_o- .....
3-PHASE SHOWN[c_ .....
1-PHASE USES
TWO POWER _ ....
LEADS
EQUIP GR
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
SPLICE BOX
/ o-
O-
O-
O-
C-
O-
O-
O-
:IELD-SUPPLIED
FUSED DISCONNECT
-- \
" _HT_%q )-'1)" @
._EL_.. D.
.____._%.
.RED_(_R)_D.
._B_R"_(_C)¢.
____LD_%
-- /
THERMOSTAT
(TYPICAL)
(DH ON 208/230 VAC
MODELS ONLY)
(W2 ON 208/230 VAC
MODELS ONLY)
Fig. 10 - High- and Control-Voltage Connections
A13016
IMPORTANT: Dehumidification control must open control
circuit on humidity rise above set point.
Use of the dehumidification cooling fan speed requires use of
either a 24 VAC dehumidistat or a thermostat which includes
control of a 24 VAC dehumidistat connection. In either case, the
dehumidification control must open the control circuit on humidity
rise above the dehumidification set point.
Heat Anticipator Setting (Electro-Mechanical
Thermostats only)
The room thermostat heat anticipator must be properly adjusted to
ensure proper heating performance. Set the heat anticipator, using
an ammeter between the WI and R terminals to determine the exact
required setting.
NOTE: For thermostat selection purposes, use 0.18 amp for the
approximate required setting. Failure to make a proper heat
anticipator adjustment will result in improper operation, discomfort
to the occupants of the conditioned space, and inefficient energy
utilization; however, the required setting may be changed slightly
to provide a greater degree of comfort for a particular installation.
Transformer Protection
The transformer is of the energy-limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blown fuse on
Indoor Fan board or Integrated Gas Controller. Replace fuse as
required with correct size and rating.
PRE-START-UP
ENVIRONMENTAL, FIRE,
ELECTRICAL SHOCK HAZARD
EXPLOSION,
Failure to follow this warning could result in personal
iniury 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 plug is in place and secured,
3. Do not remove compressor plug until all electrical
sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing compressor plug 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 panels (see Fig. 23).
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.
14
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