10
ELECTRICAL POWER SUPPLY AND
CONNECTIONS
Before installing the unit, make sure that the
voltage and number of phases on the unit data
plate are the same as the available power
supply. All wiring and switchgear installed
external
to the unit must conform to all applicable
local codes. The maximum allowable size of
fuses or circuit breaker required is shown on the
unit data label. Fuses must be of the time delay
type.
The power supply wiring is to be connected
directly to the li
ne side of compressor contactor
as shown on the connection wiring diagram. A
ground wire must be connected to the ground lug
marked GND in the electrical control box.
ROOM THERMOSTAT AND CONTROL
WIRING
JCI Heat Pump models require the installation o
conventional heating and cooling thermostat with
a dedicated "W" and “Y” terminals for activating
heating or cooling mode. Wiring between the
thermostat and the unit should be 18 Ga.
minimum. Appropriate JCI room thermostats can
be ordered as an optional
with the units if desired.
Before installing the unit, make sure that the
voltage and number of phases on the unit data
plate are the same as the available power
supply. All wiring and switchgear installed
to the unit must conform to all applicable
local codes. The maximum allowable size of
fuses or circuit breaker required is shown on the
unit data label. Fuses must be of the time delay
The power supply wiring is to be connected
ne side of compressor contactor
as shown on the connection wiring diagram. A
ground wire must be connected to the ground lug
marked GND in the electrical control box.
ROOM THERMOSTAT AND CONTROL
JCI Heat Pump models require the installation o
f
conventional heating and cooling thermostat with
a dedicated "W" and “Y” terminals for activating
heating or cooling mode. Wiring between the
thermostat and the unit should be 18 Ga.
minimum. Appropriate JCI room thermostats can
COAXIAL FREEZE PROTECTION SET POINT
The unit allows for field selection of the coaxial
freeze protection set point. Unit utilizes a
Freezestat sensor factory set for compressor
lock-out when water
below 35F. To lower the set point for low temp
heating applications with an adequate water
antifreeze solution, jumper at P6 on the
microprocessor control board should be
removed. By removing the jumper at P6, the
freezestat swit
ch is bypassed allowing for heating
operation with supply water temperatures below
35F. Only in low water applications with
adequate antifreeze should the P6 jumper be
removed, otherwise damage can occur.
Additionally it is recommended the unit comes
equi
pped with the optional low temperature
insulation package to prevent the formation of
condensate.
Modification of the set point
without adequate freeze protection
in the water loop may result in
damage to unit, or property.
-IOM2 (0611)
COAXIAL FREEZE PROTECTION SET POINT
The unit allows for field selection of the coaxial
freeze protection set point. Unit utilizes a
Freezestat sensor factory set for compressor
below 35F. To lower the set point for low temp
heating applications with an adequate water
-
antifreeze solution, jumper at P6 on the
microprocessor control board should be
removed. By removing the jumper at P6, the
ch is bypassed allowing for heating
operation with supply water temperatures below
35F. Only in low water applications with
adequate antifreeze should the P6 jumper be
removed, otherwise damage can occur.
Additionally it is recommended the unit comes
pped with the optional low temperature
insulation package to prevent the formation of
Modification of the set point
without adequate freeze protection
in the water loop may result in
damage to unit, or property.
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