035-14519-002 Rev. B (1204)
Unitary Products Group
7
Mark the unit nameplate with the appropriate heater selection on the
space provided or NONE to indicate cooling only. To operate these units
with electric heat, it is necessary to field install an electric heater kit
(2HK). See Electric Heater Kit Accessory Installation instructions for
proper installation procedure. Prior to installing electric heat, it is neces-
sary to perform the following procedure:
1.
1. Remove the 4-pin power plug from the control board (See Fig-
ure 9).
NOTE:
This pin must not be used when electric heaters are installed.
2.
Remove the four (4) screws from the duct cover and remove the
duct cover from the air handler.
Right-hand Airflow Application Only - Models with Circuit
Breakers - See Figure 10
If unit is to be installed for right hand air flow, the circuit breakers in the
heat kit will need to be removed and rotated 180°, so the OFF position
will be down when the cabinet is positioned on the right side. This is an
NEC requirement.
Do One Set Of Breakers At A Time - to make sure
wires are reconnected properly
. Loosen terminal screws on the wires
and gently pull the wires back from the breaker. Remove screws
securing the breaker plate and rotate 180°, then secure the breaker
plate and reconnect the wires to the breaker. Proper torque for terminal
screws is 35 in/lbs.
LOW VOLTAGE CONTROL CONNECTION
The 24 volt power supply is provided by an internally wired low voltage
transformer which is standard on all models. However, if the unit is con-
nected to a 208 volt power supply the low voltage transformer must be
rewired to the 208 volt tap. See the unit wiring label.
Field supplied low voltage wiring can exit the unit on the top right hand
corner or the right hand side panel (See Figure 4, item K).
Install a 7/8" plastic bushing in the selected hole and keep low voltage
wiring as short as possible inside the control box.
The field wiring is to be connected at the screw terminals of the control
board. Refer to Figures 14, 15 & 16.
NOTE:
All wiring must comply with local and national electrical code
requirements. Read and heed all unit caution labels.
NOTE:
It is possible to vary the amount of electric heat turned on during
the defrost cycle of a heat pump. Standard wiring will only bring
on 5 KW of electric heat during defrost. See Table 6 and Figures
14, 15 and 16 for alternate staging.
LINE POWER CONNECTIONS
Power may be brought into the unit through the supply air end of the
unit (top when unit is vertical) or the left side panel. Use the hole appro-
priate to the unit's orientation in each installation to bring conduit from
the disconnect. The power lead conduit should be terminated at the
electrical control box. Refer to Tables 8, 9 & 11 for wire requirements.
Also see Figure 11.
FIGURE 9:
Control Board
R
Y
G
W2
W1
O
C
2
4
V
A
C
BREAK TAB FOR
VARIABLE SPEED MOTOR
L
2
F
A
N
L
1
L
2
L
1
L2
H
L
L
1
2
3
4
K2
T9A
K1
T9A
5
A
M
P
M
A
X
2
SPEED
L
TRIP
ECM
FAN
&
LIM
PWR
LIM
&
HEAT
COM
TEST
HEAT 2
DRV
HEAT 4
DRV
HEAT 3
DRV
FAN RELAY
FAN CONNECTIONS
TRANSFORMER
CONNECTIONS
(HIGH VOLTAGE)
4-PIN POWER
CONNECTOR
1 STAGE
HEAT RELAY
24 VOLT R
5 AMP
CONTROL
VOLTAGE
FUSE
6-PIN CONNECTOR
(LIMIT, 2ND, 3RD
& 4TH HEAT RELAY
DRIVER)
24 VOLT
COMMON
FIGURE 10:
Electric Heaters in Horizontal Configuration - Right Hand
Air Flow
HEAT KIT ASSEMBLY
REMOVE 3 SCREWS TO
REMOVE THE CIRCUIT
BREAKER BRACKET
FROM HEAT KIT ASSEMBLY
JUMPER BAR
JUMPER BAR COVER
FIELD SUPPLY WIRING
WILL BE ATTACHED TO
THIS SIDE OF THE
CIRCUIT BREAKER(S)
CIRCUIT BREAKER(S) - THERE
MAY BE ONE, TWO OR THREE
CIRCUIT
BREAKER
BRACKET
HEAT KIT WIRING WILL BE
ATTACHED TO THIS SIDE OF
THE CIRCUIT BREAKER(S)
AIR
FLOW
FIGURE 11:
Line Power Connections
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
(2.5 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY 1
GND.
LUG
POWER
SUPPLY 2
POWER
SUPPLY 3
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND. LUG
POWER
SUPPLY
GND.
LUG
POWER WIRING (208/230-1-60)
NOTE:
USE ONLY COPPER CONDUCTORS
