Step 8 - Wire Field Power Supply; High Voltage - Carrier Aquazone 50PCH Installation, Start-Up And Service Instructions Manual

Step 8 — Wire Field Power Supply —
12-18 for typical wiring diagrams. See Tables 6 and 7 for addi-
tional electrical data. Please refer to the unit wiring diagram at-
tached to the control panel for field installation.
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 National Electric Code as well as all applicable local
codes. Refer to the unit electrical data on the unit nameplate for
wire and branch circuit protection sizing. Supply power volt-
age and phasing should match the required voltage and phasing
shown on the unit nameplate. Operating the unit below the
minimum voltage, above the maximum voltage or with incor-
rect phasing can result in poor system performance or damage
to the heat pump. All field wiring should be installed by quali-
fied and trained personnel. Refer to the unit wiring diagram for
field connection requirements.
Power wiring to the heat pump should be enclosed in flexi-
ble conduit to minimize the transmission of vibration from the
unit cabinet to the building.
For heat pumps with unit mounted disconnect switches,
See Fig.
field power should be connected to the marked terminals on the
disconnect switch. For heat pumps without unit-mounted dis-
connect switches (except units with dual power supply), power
is connected to the line (L) side of the compressor contactor
and the ground lug in the unit electrical box.
Units with Dual Power Supplies — For models with dual
power supplies (special order), one power supply feeds the
compressor and a second power supply feeds the unit fan mo-
tor and control circuit. The compressor power supply should be
connected to the line (L) side of the compressor contactor. The
fan motor and control circuit power supply should be connect-
ed to a provided terminal block. Care should be taken to ensure
that each power supply meets the voltage, amperage and phase
requirements of its load. Refer to the unit nameplates for
requirements.
The power supply ground wire should never be used as a
neutral wire.
Transformer Settings for 208/230-v Units — As factory
built, all 208/230-v units are wired for 230-v operation unless
the wire for 208-v option is ordered. For jobsites with a 208-v
power supply, the primary leads on the unit transformer will
need to be changed from 240-v to 208-v. Refer to the unit wir-
ing diagram for details.
12
CAUTION