Motor and pulley data
Table 11: Evaporator - standard blower motor and drive data
Motor
Adjustable motor pulley
Fixed motor pulley
Model
Drive range (RPM)
Hp
Frame size
Pitch diameter (inches)
Pitch diameter (inches)
CSV060B
745-1117
1
145
1.9–2.9
4.7
CSV096B
614-921
1.5
145
1.9–2.9
5.7
CSV120B
711-984
2
145
2.4–3.4
6.4
CSV180B
724-925
3
184
3.4–4.4
8.7
CSV240B
848-1064
5
184
4.7–5.9
9.7
CSV300B
716-882
7.5
213
5.2–6.4
12.7
Table 12: Evaporator - oversized blower motor and drive data
Motor
Adjustable motor pulley
Fixed motor pulley
Model
Drive range (RPM)
Hp
Frame size
Pitch diameter (inches)
Pitch diameter (inches)
CSV060B
897-1346
1.5
145
1.9-2.9
3.9
CSV096B
798-1105
2
145
2.4-3.4
5.7
CSV120B
875-1118
3
184
3.4-4.4
7.2
CSV180B
894-1122
5
184
4.7-5.9
9.2
CSV240B
1046-1287
7.5
213
5.2-6.4
10.2
CSV300B
850-1047
7.5
213
5.2-6.4
10.4
Blower speed adjustment
The RPM of the supply air blowers will depend on the required CFM, and the static resistances of
both the supply and the return duct systems.
Note:
Units with oversized motors or oversized drive kits are designed to operate in the
shaded region of the fan table otherwise nuisance overloads trips can occur. Motor overload
trips can be remedied by increasing the external static pressure. Refer to fan tables.
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.
2. Loosen the setscrew in the adjustable motor pulley flange. Remove external key on pulleys 4-
in. diameter and larger.
3. Blower speed will increase when moveable flange is adjusted towards the fixed flange
(closed). Blower speed will decrease when the moveable flange is adjusted away from the
fixed flange (opened). Pulleys are adjustable only in half-turn increments.
Do not open
pulley more than five full turns for "4L" and "A" belts or six full turns for "B" belts.
4. Once the pulley has been opened/closed the appropriate number of turns, replace the
external key and tighten the adjustment setscrew. Proper torque is 110–130 in.-lbs.
5. Install drive belt and adjust motor mount to tension belt.
59
C-Series Vertical (CSV) Water-Cooled Self-Contained Units, B Generation, R-410A Installation, Operation, and
Maintenance Manual
