Step 8 - Wire Field Power Supply; Step 9 - Wire Control Connections - Carrier Aquazone 50PCH Series Installation, Start-Up And Service Instructions Manual

Male adapters secure hose assemblies to the unit and risers. Install
hose assemblies properly and check them regularly to avoid sys-
tem failure and reduced service life. See Fig. 12.
Rib Crimped
Length
(609.6 mm Length Standard)
Fig. 12 — Supply/Return Hose Kit
Step 8 — Wire Field Power Supply
See Fig. 14-17 for typical wiring diagrams. See Tables
additional electrical data.
WARNING
To avoid possible injury or death due to electrical shock, open
the power supply disconnect switch and secure it in an open
position during installation.
CAUTION
All power connections must be properly torqued to avoid the
risk of overheating.
HIGH VOLTAGE
All field installed wiring must comply with the following regula-
tions and requirements:
• The responsible power supply company's local regulations
and requirements, including any corresponding special
rules
• National building regulations
• EN 60335 (Electrical appliances and similar utilities -
Safety)
- Part 1 (General demands)
- Part 2-40 (Special demands on electrical heat pumps, air
conditioners and air dehumidifiers)
• EN 12828 (Heating systems in buildings - Design and in-
stallation of water-based heating systems)
All field wiring should be installed by qualified and trained
personnel. Refer to the unit wiring diagram for field connection
requirements.
CAUTION
Operating the unit below the minimum voltage, above the
maximum voltage or with incorrect phasing can result in poor
system performance or damage to the heat pump.
Power wiring to the heat pump should be enclosed in flexible
conduit to minimize the transmission of vibration from the unit
cabinet to the building. The power is connected to the line (L) side
of the compressor contactor and the ground lug in the unit
electrical box.
Step 9 — Wire Control Connections
All thermostat wiring is connected to a terminal block located in
the unit electrical box. Refer to the unit wiring diagram for
connection details.
To avoid possible injury or death due to electrical shock, never
Swivel
route control wiring through the same conduit as power sup-
Brass
Brass
ply wiring.
Fitting
Fitting
Never route control wiring through the same conduit as power
supply wiring. Electrical noise and transients from the power
wiring can cause communication issues or damage to the con-
trol wiring and connected control components.
MPT
6-10 for
Never route control wiring through the same conduit as power
supply wiring. Electrical noise and transients from the power
wiring can cause communication issues or damage to the con-
trol wiring and connected control components.
All 50PC 50Hz units can be controlled using the included
thermostat inputs (R, O, Y1, C, G) for single stage heat pump
thermostat or field-installed DDC (Direct Digital Controls)
controls. Note that the reversing valve on the unit is energized
when the unit is in the cooling mode. See Fig.
thermostat connections.
The 50PC heat pump can be controlled by most commonly
available single stage heat pump thermostats. The reversing
valve on the 50PC Series unit is energized when the unit is in
the cooling mode. Thermostats should be located on an interior
wall away from supply ducts. Avoid locations subject to direct
sunlight or drafts, or external walls. Thermostat wiring should
be 1 mm. Refer to the installation instructions for the
thermostat for further details.
IMPORTANT: Exceptionally long runs of thermostat wire
should be avoided to prevent voltage drops in the control
circuit.
The VA capacity of the transformer should be considered when
connecting low voltage accessories to the heat pump such as ther-
mostats or solenoid valves.
Table
50PC heat pump. The total VA draw of the heat pump internal
components plus any attached accessories must be lower than the
VA capacity of the unit control transformer.
13
WARNING
CAUTION
R
C O Y
Fig. 13 — Typical Thermostat Connections
6 shows the VA draw of factory-mounted components in the
13 for typical
G