Approved H9HK heater kits are shipped ready to install using
single or dual circuit electrical supply and existing factory
installed terminal blocks. If dual circuit supply is desired,
follow instructions included under Multiple Branch Circuit
Electrical Connections section.
NOTE: Use of the 3 pole terminal block found in the main
control panel is for the unit's refrigerant cooling circuit only.
This circuit includes:
• Compressors
• Blower motors
• OD fan motors
• Low Voltage transformer (all unit electrical loads)
Circuit Options
P7TQ units installed with electric heat may be wired for single
or multiple circuit supply connections.
Single Branch Circuit Electrical Connection
Units are factory ready for addition of H9HK heater kits. See
unit rating label or
Table 4 (page 7)
for single point power
circuit Minimum Circuit Ampacity (MCA) and Maximum Over-
Current Protection of branch circuit wiring.
Field wiring will be routed from the branch circuit disconnect
to this 3 pole terminal block for both heating and cooling
operation.
Multiple Branch Circuit Electrical Connection
For Dual Point Power Circuit connections see the unit rating
plate or electrical data in
Table 5 (page 8)
for proper high
voltage branch circuit requirements. Both 3 pole terminal
blocks provided in the unit will be used for converting to dual
supply connections.
The 3 pole terminal block located in the electric heat vestibule
is for connection of the electric heater kit branch circuit wiring.
Field wiring will be routed from the electric heat branch circuit
disconnect to this 3 pole terminal block for heating operation.
The factory supplied red, yellow, and black wires connected
to the electric heat terminal block from the main unit 3 pole
terminal block must be removed. These 3 wires (if long enough)
may be used for connection between the unit main control
panel 3 pole terminal block and the second branch circuit
power supply disconnect for cooling and blower operation.
See
Figure 13 (page 9)
.
If circuit breakers are used for any circuit, they must be
used for all electric heat circuits. Use one breaker for each
circuit. See
Table 3, (page 6)
. If circuit breakers are not
being used, proceed to the Heat Kit Installation section on
page 4
.
IMPORTANT NOTE:
Circuit breakers (if installed) in the unit with the addition
of heater kits are for short circuit protection of the internal
heater element circuit wiring and DO NOT serve as a
unit disconnect. The circuit breakers DO NOT provide
over-current protection of the supply wiring.
• Whether or not circuit breakers are used in the units,
protection and disconnect requirements.
NOTE: If any of
the original wiring supplied with the unit must be replaced,
it must be replaced with material of the same gauge and
temperature rating.
Clearances to Combustibles
All units are approved for zero clearance to combustibles when
installed according to these instructions and other instructions
included with the unit and other approved accessories.
Wiring Diagrams
Wiring Diagrams are shipped with each H9HK heater kit
assembly. Attach the heater kit wiring diagram label over the
bottom half of Sheet #2 of the unit wiring diagram label on
the control panel access door. For proper adherence, make
sure the surface is clean and free of oil before applying.
Clearances
All H9HK electric heater kits are approved for use in
installations with zero-clearance to combustibles at any blower
speed allowed on the units blower performance charts for
both Horizontal and Downflow applications when installed
according to these instructions and other instructions included
with the unit and other approved accessories. See note (in
bold type) for vertical duct applications in Heat Kit Installation
section on
page 4
.
All wiring must comply with the current revision of the National
Electric Code and must be sized for the minimum ampacities
as listed on the unit data label or in
Table 1
. Refer to the
detailed wiring diagrams for proper connections:
Figure 13
,
Figure 14
,
Figure 15
,
Figure 16
,
, and
Figure 19
.
If the unit was previously installed without electric heat, the
existing supply wiring may not be sufficient to handle the
increased load. See the unit rating label or
for minimum circuit ampacities
and maximum overcurrent protection ratings.
Installation Preparations
Before proceeding with the electrical connections, make sure
that the voltage, frequency, and phase of the supply source
are the same as those specified on the unit rating label. Also
verify that the service provided by the utility is sufficient to
handle the additional load imposed by this equipment.
Terminal Blocks
Table 1. Heater Kits and Part Numbers
HEATER
KITS
DESCRIPTION
PART
NUMBER
3 PHASE
208/240V
H9HK009Q-01 (9kw)
1011669
H9HK018Q-11 (18kw)
1011672
H9HK030Q-21 (30kw)
1011675
H9HK035Q-21 (35kw)
1011678
3 PHASE
480V
H9HK009S-01 (9kw)
1011670
H9HK018S-01 (18kw)
1011673
H9HK030S-01 (30kw)
1011676
H9HK035S-01 (35kw)
1011679
3
CP-H9HK (05-20) 1012566-B
