Section Vi: Low Voltage Control Connections; Section Vii: Blower Speed Connections; Section Viii: Unit Data - York 41HP AHR18B Installation Manual

661693-UIM-E-1212
SECTION VI: 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.
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 5 for additional
information on heat during defrost cycle.

SECTION VIII: UNIT DATA

TABLE 2: Physical and Electrical Data
Models
Blower - Diameter x Width
HP
Motor
Nominal RPM
Voltage
Full Load Amps @230V
Type
1
Filter Size
Permanent Type Kit
Shipping / Operating Weight (lbs.)
1. Field Supplied.
TABLE 3: Electrical Data - Cooling Only
Models
AHR18B / AHR24B
AHR30B / AHR36B /
AHR42C / AHR48D /
AHR60D
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..
8
AHR18B AHR24B
10 x 8 10 x 8
1/4 HP 1/4 HP
1075 1075
208/230 208/230
1.4 1.4
16 x 20 x 1 16 x 20 x 1
1PF0601BK 1PF0601BK 1PF0601BK
112/100 117/102
1
Minimum Circuit Ampacity
Motor FLA
1.4
3.0
SECTION VII: 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.
230 VOLT
BLOWER MOTOR
FIGURE 14: Blower Speed Connections
AHR30B AHR36B
10 x 8 10 x 8
3/4 HP 3/4 HP
1075 1075
208/230 208/230
3.0 3.0
DISPOSABLE OR PERMANENT
16 x 20 x 1 16 x 20 x 1
1PF0601BK
117/105 122/110
MOP
1.8 15
3.8 15
AHR STANDARD MOTOR
FACTORY WIRED TO
TRANSFORMER
CAP
FACTORY WIRED TO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
HIGH
BLK
MED
LOW
GND.
AHR42C AHR48D
10 x 10 10X10
3/4 HP 3/4 HP
1075 1075
208/230 208/230
3.0 3.0
20 x 20 x 1 22 x 20 x 1
1PF0602BK 1PF0603BK
148/133 165/147
Minimum Wire Size
2
(AWG)
14
14
Johnson Controls Unitary Products
AHR60D
10X10
3/4 HP
1075
208/230
3.0
22 x 20 x 1
1PF0603BK
168/150
3