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Installation
• 0/2 AWG
120 in-lbs
• 8 AWG
40 in-lbs
• 10-14 AWG 35 in-lbs
b. Reconnect the ground wire that was
disconnected in Step 1(f) to the ground lug in
the heater/heat pump electrical box.
c. Ensure that all fuses are accounted for (2 x 30
amp + 2 x 60 amp for 15kW & 4 x 60 amp for
20kW), and are securely fastened in the fuse
block.
d. Reconnect the blower motor line voltage wires
block that was disconnected in Step 1(g) to the
fuse block using the male terminal connection
posts. The black wire should connect to the
"L1" side, and the white wire should connect to
the "L2" side.
f.
Reconnect the blower motor ground wire that
was disconnected in Step 1(g) to the ground
lug and tighten the screw.
g. Reference the appropriate wiring diagram at
the end of the manual to ensure that all
connections have been made and are correct.
Ensure that the wires are connected to the
correct matching terminal and all unused wires
are capped with a wire nut. Severe damage to
the unit, personal injury, or death can occur if
wires are not connected securely to the correct
terminal or loose wires come into contact with
the cabinet or other components.
sTeP 8: CONNECTING LOW VOLTAGE WIRES
a. The four remaining wires on the long end of the
wire harness are low voltage wires (Yellow,
Purple, Red, and Blue). Connect these wires to
the motor control board according to Table 2.
Table
2r Only)
Heater Box
Yellow
Blue
Red
Purple
Revised 05-13
Heat Pump Box
R
C1
W1
EM
Subject to change without prior notice
b. Reconnect the low voltage wires from the
condensing section to the terminal block in the
air handler that was removed in Step 1(g). The
"C", "R", "O", "Y1", & "Y2" should all be
connected in this step.
c. Reconnect the blower motor communication
harness that was disconnected in Step 1(d) to
the new motor control board.
d. Reconnect the thermostat wire terminal block
that was removed in Step 1(e) to the new motor
control board. If new motor control board is the
same as the old motor control board, the
original block that was removed in Step 1(e)
will fit and reconnecting the thermostat wires
to the block will not be necessary.
sTeP 9: THERMOSTAT WIRE CONNECTIONS
a. Ensure that two low voltage wires are available
from the thermostat to make the "W1" and
"EM" connections. If these wires are not
located, they will need to be pulled and routed
from the back of the thermostat to motor
control board in the heater electrical box.
b. Strip the insulation off of the "W1" and "EM"
wires and insert into the thermostat control
wire block on the motor control board. Connect
the other end of the wires to the back of the
thermostat to the supplemental and emergency
heat terminals. Reference the user's manual for
the thermostat for proper connection.
sTeP 10: Use the ground lug provided in the heater
control box to connect the field ground from the
power supply.
sTeP 11: Remove the wiring diagram that is
adhered to the back side of the front panel. Replace
with the wiring diagram that was included with the
heater kit. Using spray adhesive glue is
recommended.
sTeP 12: Place the adhesive back heater data label
on top of the existing data tag as the new
information will replace the existing information.
sTeP 13: RESTORING POWER / TURNING ON THE
UNIT
6 720 220 328
HK Series
9
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