5169034-UIM-B-0216
Johnson Controls Unitary Products
7
SECTION VII: LOW VOLTAGE CONTROL
CONNECTIONS
The 24 volt power supply is provided by an internally wired low voltage
transformer which is standard on all models. If the unit is connected to a
208 volt power supply, the low voltage transformer must be rewired to
the 208 volt tap. See the unit wiring diagram.
Field supplied low voltage wiring can exit the unit through the top right
(when unit is vertical upflow) or the right side panel. Refer to Figure 5.
Remove desired knockout and pierce foil faced insulation to allow
wiring to pass through. Use as small of a hole as possible to minimize
air leakage. Install a 7/8” plastic bushing in the selected hole and keep
low voltage wiring as short as possible inside the control box.
To further minimize air leakage, seal the wiring entry point at the
outside of the unit.
The field wiring is to be connected at the pigtails supplied with the air
handler. Refer to Figures 11 & 12 for system wiring.
SECTION VIII: BLOWER SPEED
CONNECTIONS
Adjust blower motor speed to provide airflow within the minimum and
maximum limits approved for indoor coil, electric heat and outdoor unit.
Make speed tap adjustments at the motor terminal block. Refer to
airflow data listed in Table 11. Connect motor wires to motor speed tap
receptacle for speed desired.
The standard ECM motor operates when a 24 VAC signal is sent to any
of its 5-speed taps. If simultaneous 24 VAC inputs are present, the
motor operates at the highest speed tap that is energized. The lowest
speed is 1, and the highest speed is 5. The air handler comes factory
wired with the electric heat kit connected to tap 5 for the heating speed,
and the cooling heat pump connected to tap 4 for the heating speed.
The cooling / heat pump indicating speed is supplied by the thermostat
“G” signal.
The electric heat kit wire for the heating speed should be moved from 5
to the appropriate speed tap according to Table 4. If electric heat
requires speed tap 5, the highest speed tap available for cooling / heat
pump heating is tap 4.
If a lower circulating speed is desired for fan only operation (lower than
a heating or cooling fan speed), connect the factory “red” wire shipped
on tap #4 into the lowest setting desired. Field install a wire from low
voltage “YEL,” and connect it to the motor speed tap desired for cooling
/ heat pump heating fan speed.
FIGURE 9:
Line Power Connections
),(/'32:(5:,5,1*
9
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NOTICE
All wiring must comply with local and national electrical code require-
ments. Read and heed all unit caution labels.
NOTICE
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 the
first stage of electric heat during defrost. See Table 6 for additional
information on heat during defrost cycle.
FIGURE 10:
Blower Speed Connections
ECM - HIGH EFFICIENCY MOTOR
1
2 3
4 5
C
G
L
N
GRN
S
TANDARD
E
CM
(X
1
3)
BL
O
WER
MO
T
O
R
BLU/WHT
BLK/WHT
RED/WHT
BLK
RED
F
O
R
P
O
WER
WIRING
CO
NTR
O
L
WIRING
F
O
R
T
O
S
E
Q
UEN
C
ER HEATER
T
O
RE
S
I
S
T
O
R
T
O
RE
S
I
S
T
O
R
T
O
COMMO
N
O
N
TRAN
S
F
O
R
M
ER
T
O
24
0
V
O
N
TRAN
S
F
O
R
M
ER
A
0
4
0
2-
001
