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JOHNSON CONTROLS
14
FORM 145.32-IOM1 (908)
MOTOR AND PULLEY DATA
EVAPORATOR
- STANDARD BLOWER MOTOR AND DRIVE DATA
Belts
HP
Frame Eff.(%)
Pitch Dia.(in) Browning # Pitch Dia.(in) Browning#
Rating / Size
Qty
2 TON 845-1170 1/4 56 66.0 2.6-3.6 1VP40 X 5/8 5.4 AK56H 4L370 1
3 TON 675-1010 1/3 56 75.0 2.0-3.0 1VP34 X 5/8 5.2 AK54H 4L370 1
4 TON 675-1010 3/4 56 75.0 2.0-3.0 1VP34 X 5/8 5.2 AK54H 4L400 1
5 TON 745-1120 1 143 75.0 2.0-3.0 1VP34 X 7/8 4.7 AK49H 4L390 1
CONDENSER
- STANDARD BLOWER MOTOR AND DRIVE DATA
Belts
HP
Frame Eff.(%)
Pitch Dia.(in) Browning # Pitch Dia.(in) Browning#
Rating / Size
Qty
2 TON 770-1070 1/2 56 75.0 2.6-3.6 1VP40 X 5/8 5.9 AK61H 4L500 1
3 TON 745-1071 3/4 56 82.5 2.0-3.0 1VP34 X 5/8 4.7 AK49H 4L390 1
4 TON 615-920 1 143 82.5 2.0-3.0 1VP34 X 7/8 5.7 AK59H 4L490 1
5 TON 770-1070 1.5 145 84.0 2.6-3.6 1VP40 X 7/8 5.9 AK61H 4L500 1
Model
Motor
Adjustable
Motor Pulley
Model
Drive Range
(RPM)
Fixed
Blower Pulley
Drive Range
(RPM)
Motor
Adjustable
Motor Pulley
Fixed
Blower Pulley
BLOWER SPEED ADJUSTMENT
The RPM of the supply air and condenser air blow-
ers will depend on the required CFM, and the static
resistance of both the supply/discharge and the return/
intake duct systems. With this information, the RPM
for the blowers can be determined from the blower
performance tables. Adjustment of blower speed is
accomplished as follows:
1. Loosen belt tension by moving motor towards the
blower shaft via the adjustable mounting base.
2. Loosen the setscrew in the adjustable motor pul-
ley ange. Remove external key on pulleys 4-in.
dia and larger.
3. Blower speed will increase when moveable ange is
adjusted towards the xed ange (closed). Blower
speed will decrease when the moveable ange
is adjusted away from the xed ange (opened).
Pulleys are adjustable only in half-turn increments.
Do not open pulley more than ve full turns for “4L”
and “A” belts, or six full turns for “B” belts.
4. Once the pulley has been opened/closed the ap-
propriate number of turns, replace the external key
and tighten the adjustment set screw. Proper torque
is 110 - 130 in-lbs.
5. Install drive belt and adjust motor mount to tension
belt.