90
Table 27 – Belt Tension Adjustment
48PM
VOLTAGE
BELT TENSION (lb)
Unit Model Number Position 10
A,J
B,K
C,L
D,M
E,N
F,P
G,Q
H,R
16
230
4.8
5.1
5.6
4.5
NA
4.7
5.0
5.5
460
4.8
5.1
5.6
4.5
NA
4.7
5.0
5.5
575
5.3
5.1
5.6
4.5
NA
5.2
5.0
5.5
20
230
4.8
5.1
5.6
4.5
NA
4.7
5.0
5.5
460
4.8
5.1
5.6
4.5
NA
4.7
5.0
5.5
575
5.3
5.1
5.6
4.5
NA
5.2
5.0
5.5
24
230
4.8
5.1
5.6
4.5
NA
4.7
5.0
5.5
460
4.8
5.1
5.6
4.5
NA
4.7
5.0
5.5
575
5.3
5.1
5.6
4.5
NA
5.2
5.0
5.5
28
230
4.5
5.4
5.9
4.5
4.5
5.4
5.9
4.5
460
4.5
5.4
5.9
4.5
4.5
5.4
5.9
4.5
575
4.5
5.4
5.9
4.5
4.5
5.4
5.9
4.5
50PM
VOLTAGE
BELT TENSION (lb)
Unit Model Number Position 10
A,J
B,K
C,L
D,M
E,N
F,P
G,Q
H,R
16
230
4.8
5.1
5.6
4.5
4.8
5.1
5.6
4.5
460
4.8
5.1
5.6
4.5
4.8
5.1
5.6
4.5
575
5.3
5.1
5.6
4.5
5.3
5.1
5.6
4.5
20
230
4.8
5.1
5.6
4.5
4.8
5.1
5.6
4.5
460
4.8
5.1
5.6
4.5
4.8
5.1
5.6
4.5
575
5.3
5.1
5.6
4.5
5.3
5.1
5.6
4.5
24
230
4.8
5.1
5.6
4.5
4.8
5.1
5.6
4.5
460
4.8
5.1
5.6
4.5
4.8
5.1
5.6
4.5
575
5.3
5.1
5.6
4.5
5.3
5.1
5.6
4.5
28
230
4.5
5.4
5.9
4.5
4.5
5.4
5.9
4.5
460
4.5
5.4
5.9
4.5
4.5
5.4
5.9
4.5
575
4.5
5.4
5.9
4.5
4.5
5.4
5.9
4.5
Evaporator Fan Performance Adjustment
(Fig. 58--60)
Fan motor pulleys are factory set for speed shown in Appendix D.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen nuts on the 4 carriage bolts in the mounting base.
Using adjusting bolts and plate, slide motor and remove
belt.
3. Loosen movable-pulley flange setscrew. (See Fig. 60.)
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maximum
speed specified in Appendix D.
See Appendix D for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Appendix D for speed change for
each full turn of pulley flange.)
6. Replace belts.
7. Realign fan and motor pulleys:
a. Loosen fan pulley setscrews.
b. Slide fan pulley along fan shaft.
c. Make angular alignment by loosening motor from
mounting plate.
8. Tighten belts.
9. Restore power to unit.
C06041
Fig. 60 -- Evaporator--Fan Alignment and Adjustment
Evaporator Fan Belt Tension Adjustment
To adjust belt tension:
1. Turn off unit power.
2. Slide out fan deck to service position as shown in
Evaporator Fan Service and Replacement section above.
3. Loosen motor mounting plate bolts.
4. Move motor mounting plate to adjust to proper belt tension.
Motor adjuster bolts may be used to tighten belts. (See Fig.
58 or 59.) Do not overtighten belt. See Table 27 for
48/50PM16--28 size belt tension
5. Check for proper belt alignment. Adjust if necessary.
6. Tighten motor mounting plate bolts to lock motor in proper
position.
7. Return fan deck back into operating position.
8. Restore power to unit.
48/
50P
G
and
P
M
Summary of Contents for 48/50PG Series
Page 32: ...32 C07009 Fig 20 Air Baffle Dimensions 48 50PG03 16 48 50PG and PM...
Page 33: ...33 C08077 Fig 21 Air Baffle Dimensions 48 50PG20 28 and 48 50PM16 28 48 50PG and PM...
Page 58: ...58 C08549 Fig 28 48PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 59: ...59 C08550 Fig 29 50PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 64: ...64 C08471 Fig 34 Typical 48PG and PM16 28 Control Schematic 48PM16 28 Shown 48 50PG and PM...
Page 66: ...66 C08557 Fig 36 Typical 50PG and PM16 28 Control Schematic 50PG20 28 Shown 48 50PG and PM...
Page 68: ...68 C08558 Fig 38 Typical 48 50PG and PM16 28 Power Schematic 48 50PM16 28 Shown 48 50PG and PM...
Page 72: ...72 C08565 Fig 42 Typical 48 50PG20 28 Component Arrangement 48 50PG20 24 Shown 48 50PG and PM...
Page 73: ...73 C08067 Fig 43 48 50PM16 28 Component Arrangement 48 50PG and PM...
Page 74: ...74 C08562 Fig 44 48 50PM16 28 with Humidi MiZert Component Arrangement 48 50PG and PM...
Page 208: ...208 48 50PG and PM...