1053681-UIM-B-0514
Johnson Controls Unitary Products
9
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, 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. Refer to Figure 2.
Remove desired knockout and pierce foil faced insulation to allow wir-
ing 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 con-
trol board harness. Refer to SECTIONS X and XI for system wiring.
SECTION VIII: BLOWER SPEED
CONNECTIONS
Adjust blower motor speed to provide airflow within the minimum and
maximum limits approved for evaporator coil, electric heat and outdoor
unit. Speed tap adjustments are made at the motor terminal block. Air-
flow data is shown in Table 10.
Connect motor wires to motor speed tap receptacle for speed desired.
See unit wiring label for motor wiring details.
SECTION IX: UNIT DATA
All wiring must comply with local and national electrical code require-
ments. Read and heed all unit caution labels.
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 5 for additional
information on heat during defrost cycle.
NOTICE
NOTICE
FIGURE 14:
Blower Speed Connections
FACTORY WIRED TO
TRANSFORMER
FACTORY WIRED TO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
R
U
P
R
U
P
HIGH
MED
LOW
GND.
230 VOLT
BLOWER MOTOR
PSC STANDARD MOTOR
CAP
N
R
B
BLK
TABLE 2:
Physical and Electrical Data - Cooling Only
Models
AHR18B
AHR22B
AHR24B
AHR29C
AHR30B
AHR34C
AHR36B
AHR42C
AHR48D
AHR60D
Blower - Diameter x
Width
10 x 8
10 x 8
10 x 8
10 x 10
10 x 8
10 x 10
10 x 8
10 x 10
10X10
10X10
Motor
HP
1/4 HP
1/3 HP
1/4 HP
1/2 HP
3/4 HP
1/2 HP
3/4 HP
3/4 HP
3/4 HP
3/4 HP
Nominal
RPM
1075
1039
1075
1075
1075
1075
1075
1075
1075
1075
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
1.4
2.2
1.4
2.3
3.0
2.3
3.0
3.0
3.0
3.0
Filter
1
Type
DISPOSABLE OR PERMANENT
Size
16 x 20 x 1 16 x 20 x 1 16 x 20 x 1 20 x 20 x 1 16 x 20 x 1 20 x 20 x 1 16 x 20 x 1 20 x 20 x 1 22 x 20 x 1 22 x 20 x 1
Permanent
Type Kit
1PF0601BK 1PF0601BK 1PF0601BK 1PF0602BK 1PF0601BK 1PF0602BK 1PF0601BK 1PF0602BK 1PF0603BK 1PF0603BK
Shipping / Operat-
ing Weight (lbs.)
112/100
112/100
117/102
131/116
117/105
132/117
122/110
148/133
165/147
168/150
1. Field Supplied.
TABLE 3:
Electrical Data - Cooling Only
Models
Motor FLA
1
Minimum Circuit Ampacity
MOP
2
Minimum Wire Size
(AWG)
3
AHR18B / AHR24B
1.4
1.8
15
14
AHR22B
2.2
2.8
15
14
AHR29C/AHR34C
2.3
2.9
15
14
AHR30B / AHR36B /
AHR42C / AHR48D /
AHR60D
3.0
3.8
15
14
1. FLA = Full Load Amps
2. MOP = Maximum Overcurrent Protection device; must be HACR type circuit breaker or time delay fuse.
3. 75
C, copper wire only. If wire other than non-plated, 75
C ambient, copper wire is used, consult applicable tables of the NEC and local codes.
