Hiuh-Volta_e Connections
The unit must have a separate electrical service with a
field-supplied, waterproof disconnect switch mounted at, or within
sight from the unit. Refer to the unit rating plate, NEC and local
codes for maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing.
The field-supplied disconnect may be mounted on the unit over
the high-voltage inlet hole when the standard power and
low-voltage entry points are used. See Fig. 2 and 3 for acceptable
location. Remove high voltage knockout.
See unit wiring label (Fig. 11-13) and Fig. 9 for reference when
making high voltage connections. Proceed as follows to complete
the high-voltage connections to the unit.
Single phase units:
1. Run the high-voltage (L1, L2) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
HIGH
VOLTAGE
!
POWER LEADS do..-
(SEE UNIT WIRING|
LABEL) _:_
3-PHASE SHOWN
1-PHASE USES L._
TWO POWER
LEADS EQUIP GR
SPLICE BOX
CONTROLBOX
LOW-VO LTAG E
POWER LEADS
(SEE UNIT) -
WiRiNG LABEL
¢O
O
O
O
O
O'
O
O
O
FIELD-SUPPLIED
FUSED DISCONNECT
m
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Fig. 9 - High- and Control-Voltage Connections
THERMOSTAT
(TYPICAL)
A09071
,in 25mm m n ii
A09052
Fig. 10 - Condensate Trap
4. Connect field LI to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 23 of
the compressor contactor.
Three-phase units:
1. Run the high-voltage (L1, L2, L3) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L3 to yellow wire on connection 13 of
the compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
Special Procedures for 208-V Operation
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. With disconnect
switch open, move black wire from transformer (3/16 in.)
terminal marked 230 to terminal marked 200. This retaps
transformer to primary voltage of 208 vac.
Control Voltage Connections
NOTE: Do not use any type of power-stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated
(35°C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 1l (30.5 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color-coded, insulated
(35 ° C minimum) wires.
Standard Connections
Locate the eight (nine on 3-phase) low voltage thermostat leads in
24 volt splice box. See Fig. 9 for connection diagram. Run the
low-voltage leads from the thermostat, through the control wiring
inlet hole grommet (Fig. 2 and 3), and into the low-voltage splice
box. Provide a drip loop before running wires through panel.
Secure and strain relief all wires so that they do not interfere with
operation of unit. A gray wire is standard on 3-phase units for
connection to an economizer.
If an accessory electric heater is installed, low voltage leads from
heater must be connected to factory supplied control leads from
Indoor Fan Board P4 connector.
NOTE: If the unit 24V wires do not have a matching receptacle,
cut the 24V wires from the electric heater plug, strip the ends, and
wire nut together to match the schematic connections. If the electric
heater 24V wires do not have a matching plug, cut the 24V wires
from the unit receptacle, strip the ends, and wire nut together to
match the schematic connections.
Factory wires are provided for electric heat staging WI and W2
(W2 and W3 on IFB). If room thermostat has only one stage of
supplemental heat, connect white and violet wires shown in Fig. 9
to second stage heat field wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.
Transformer Protection
The transformer is of the energy-limiting type. It is set to withstand
a 30-second overload or shorted secondary condition. If an
overload or short is present, correct overload condition and check
for blower fuse on Interface Fan Board. Replace fuse as required
with correct size and rating.
Accessory Electric Heaters Installation
Electric heaters may be installed with the PH3G--A units per
instructions supplied with electric heater package. See unit rating
plate for factory-approved electric heater kits.
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