PHD4 Series K and WPH4 Series K: Installation Instruction
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
12
High-Voltage 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
for acceptable location. Remove high
voltage knockout.
See unit wiring label (
) and
making high voltage connections. Proceed as follows to complete the
high-voltage connections to the unit.
A09071
Fig. 12 – High- and Control-Voltage Connections
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.
4. Connect field L1 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
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 ft
(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
for connection diagram. Run the low-voltage
leads from the thermostat, through the control wiring inlet hole grommet
(see
), 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 W1 and W2 (W2 and
W3 on IFB). If room thermostat has only one stage of supplemental heat,
connect white and violet wires shown in
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 blown 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 unit per instructions supplied
with electric heater package. See unit rating plate for factory-approved
electric heater kits.
Sequence of Operation
a. CONTINUOUS FAN
(1.) Thermostat closes circuit R to G energizing the blower
motor for continuous fan.
b. COOLING MODE
(1.) If indoor temperature is above temperature set point,
thermostat closes circuits R to G, R to Y and R to O-The
unit delivers cooling airflow.
WARNING
!
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. Tag the disconnect switch with a suitable warning label. With
disconnect switch open, move black wire from transformer (3/16 in.)
terminal marked 230 to terminal marked 208. This retaps transformer to
primary voltage of 208 vac.
