Warning, Electrical wiring – HP H4H3 User Manual
3-phase R-410A Split System Heat Pump
506 01 5102 00
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in per‐
sonal injury or death.
Before installing, modifying or servicing system,
turn OFF the main (remote) electrical disconnect
device. There may be more than one disconnect
Refer to unit rating plate for the required supply voltage.
Depending on the model, required supply voltage will be:
208/230 V, 3-phase, 60 Hz.
460 V, 3-phase, 60 Hz.
Outdoor units are approved for use with copper
conductors only. Do not use aluminum wire.
Refer to unit rating plate for minimum circuit ampacity and
circuit protection requirements.
Permanently ground unit in accordance with the National
Electrical Code and local codes or ordinances. Use a
copper conductor of the correct size from the grounding
lug in control box to a grounded connection in the service
panel or a properly driven and electrically grounded
Supply Voltage Wiring Connections
Make all outdoor electrical supply (Line Voltage)
connections with raintight conduit and fittings. Most
codes require a disconnect switch outdoors within sight of
the unit. Consult local codes for special requirements.
Route electrical supply (Line Voltage) wiring through
knockout hole in bottom of Control Box.
Connect two power wires to Contactor and one power
wire to Blue lead wire (use wire nut). Connect ground wire
to Ground Lug. Refer to Wiring Diagram on unit and
208/230 V and 460 V
(Line Voltage) Connections
PER NEC AND/OR
BLUE LEAD WIRE
Phase Monitor Relay Board
The Phase Monitor Board detects the sequence of the
three phase electrical system, and a relay breaks the Y
(call for cooling) control signal if the phasing is incorrect.
Additionally, the board will detect the loss of voltage on
any of the three phase inputs and break the Y signal in the
An LED on the board displays the following status:
Red LED ON -
Normal function, relay contact
Red LED Blinking - Abnormal function, relay contact
Red LED OFF -
No 24 VAC control power present at
NOTE: Units with Comfort Alert
t Diagnostics device
have phase monitor feature built in.
Phase Monitor Relay Board
Thermostat Wiring Connections
Route thermostat wiring through rubber grommet in
bottom of Control Box. Low voltage lead wires are
provided in the control box for connection to thermostat
wires (use wire nuts). Refer to Wiring Diagram on unit and
Figure 11 for low voltage wiring examples.
NOTE: Use No. 18 AWG (American Wire Gage)
color-coded, insulated (35
°C minimum) wire. If
thermostat is located more than 100 feet (30.5 m) from
unit as measured along the control voltage wires, use No.
16 AWG color-coded wires to avoid excessive voltage