5169032-UIM-C-0416
Johnson Controls Unitary Products 11
SECTION X: 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 3.
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 21 & 24 for system wiring.
SECTION XI: 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.
SECTION XII: UNIT DATA
NOTICE
All wiring must comply with local and national electrical code require-
ments. Read and heed all unit caution labels.
FIGURE 17: Blower Speed Connections
67$1'$5'(&0+,*+()),&,(1&<02725
&
*
/
1
*51
67$1'$5'
(&0
%/2:(5
02725
%/8:+7
%/.:+7
5(':+7
%/.
5('
)25
32:(5
:,5,1*
&21752/
:,5,1*
)25
726(48(1&(5+($7(5
725(6,6725
725(6,6725
72&2002121
75$16)250(5
72921
75$16)250(5
$
TABLE 2:
Physical and Electrical Data - Cooling Only
Models 18B 24B 30B 36B 36C 42C 48C 48D 60C 60D
Blower - Diameter x Width
10 x 8 10 x 8 10 x 8 10 x 8 11 x 10 11 x 10 11 x 10 11 x 10 11 x 10 11 x 10
Motor HP
1/3 HP 1/3 HP 1/3 HP 1/2 HP 1/2 HP 1/2 HP 3/4 HP 3/4 HP 3/4 HP 3/4 HP
Nominal RPM
1050 1050 1050 1050 1050 1050 1050 1050 1050 1050
Voltage
208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230
Full Load Amps @230V
2.6 2.6 2.6 3.8 3.8 3.8 5.4 5.4 5.4 5.4
Filter
1
Type
DISPOSABLE OR PERMANENT
Size
16 x 20 x 116 x 20 x 116 x 20 x 116 x 20 x 120 x 20 x 120 x 20 x 120 x 20 x 122 x 20 x 120 x 20 x 1 22 x 20 x 1
Permanent Type Kit
1PF0601 1PF0601 1PF0601 1PF0601 1PF0602 1PF0602 1PF0602 1PF0603 1PF0602 1PF0603
Shipping / Operating Weight (lbs.)
91/85 93/87 119/113 119/113 120/114 144/136 158/150 163/153 156/146 180/170
1. Field supplied.
TABLE 3:
Electrical Data - Cooling Only
Models
Motor FLA
1
Minimum Circuit Ampacity
MOP
2
18B/24B/30B 2.6 3.3 15
36B/36C/42C 3.8 4.8 15
48C/48D/60C/60D 5.4 6.8 15
1. FLA = Full Load Amps
2. MOP = Maximum Overcurrent Protection device; must be HACR type service disconnect or time delay fuse. Refer to the latest edition of the National Electric Code or in Canada
the Canadian electrical Code and local codes to determine correct wire sizing.
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