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12 HK Series
By adding electrical heaters, the electrical
demand may change quite significantly. The
existing wires between the circuit panel and
the air handler may not be sufficient and may
need to be replaced. Verify the breaker is
appropriately sized for the new electrical load
also. See the data tag label that was included
with the heater kit or at the end of the manual
for the appropriate wire and breaker size for
the amount of electric heat that is being
installed. If the electrical load surpasses the
rating of the breaker and/or wire size, add a
separate circuit at the breaker panel, and run
new wire.
Units with 5, 7.5, or 10 kW electrical
Heater elements (HK050, HK075, HK100)
a. Reconnect the two line voltage wires that were
disconnected in Step 1(d) to the power
terminal block in the heater electrical box.
Torque to 22 in-lbs.
b. Reconnect the ground wire that was
disconnected in Step 1(d) to the ground lug in
the heater electrical box. Tighten with a
screwdriver.
c. There are two black wires connected to the
power terminal block in the heater electrical
box with female quick connection terminals.
Route these two wires from the heater
electrical box to the air handler electrical box.
Connect the two wires to the male quick
connection terminals on the blower motor
power terminal block . Ensure that the wire
from the heater electrical box that is connected
to "L1" side is also connected to "L1" side of
the blower motor terminal block in the air
handler electrical box and "L2" is connected to
"L2".
d. Reference the appropriate wiring diagram at
the end of this manual to ensure that all
connections have been made and are correct.
Units with 15 or 20 kW electrical Heater
elements (HK150, HK200)
a. Reconnect the two line voltage wires that were
disconnected in Step 1(d) to the power fuse
block in the heater electrical box. Use the
6 720 220 328
following torques when tightening the line
voltage wires:
• 0/2 AWG
• 8 AWG
• 10-14 AWG 35 in-lbs
b. Reconnect the ground wire that was
disconnected in Step 1(d) to the ground lug in
the heater electrical box. Tighten with a
screwdriver.
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) There are two black wires connected to the
power fuse block in the heater electrical box
with female quick connection terminals. Route
these two wires from the heater electrical box
to the air handler electrical box. Connect the
two wires to the male quick connection
terminals on the blower motor power terminal
block. Ensure that the wire from the heater
electrical box that is connected to "L1" side is
also connected to "L1" side of the blower motor
terminal block in the air handler electrical box
and "L2" is connected to "L2"
e) Reference the appropriate wiring diagram at
the end of this manual to ensure that all
connections have been made and are correct.
Caution
sTeP 9: CONNECTING LOW VOLTAGE WIRES
a. Reconnect the low voltage wires from the
condensing section to the motor control board
that was removed in Step 2(e). The "C", "R",
"O", "Y1", & "Y2" should all be connected in this
step.
b. Reconnect the blower motor communication
harness that was disconnected in Step 2(a) to
the motor control board.
Subject to change without prior notice
120 in-lbs
40 in-lbs
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.
Installation
Revised 05-13
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