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[ IV Indoor Unit Components ]
[5] Fan
Use the following procedure to replace the pulley and motor of the PFAV-P500VM-E.
1. Replacement Procedure
(1) Attaching the fan pulley set and electric motor pulley set
1) Remove the front lower and upper panels (2 screws for each).
2) Loosen the electric motor base securing bolts and electric
motor base slide bolt, and then remove the V belt. See Fig-
ures 1 and 2.
3) Loosen the set screws of the pulleys, and then remove the
fan pulley.
* Depending on the diameter of the pulley, the electric motor
may need to be slid towards the back side.
4) Slide the electric motor base towards the front.
5) Attach the replacement pulleys and V belt.
6) Set the parallelism of the fan pulley and electric motor pulley
so that the contents of Table 1 and Figure 3 are satisfied.
7) Tighten the set screws. (Torque: 13.5N•m)
Furthermore, coat the set screws with screw lock (procure
locally) to prevent them from coming undone.
(Screw lock: ThreeBond 1332N or the equivalent)
8) Attach the parts in the reverse order of removal.
(2) Attaching the electric motor
When the electric motor is removed, make sure the work is
performed by two people to ensure it is not dropped.
1) Remove the front lower and upper panels (2 screws for each).
2) Loosen the electric motor base securing bolts and electric
motor base slide bolt, and then remove the V belt. See Fig-
ures 1 and 2.
3) Loosen the set screws of the pulleys, and then remove the
fan pulley.
* Depending on the diameter of the pulley, the electric motor
may need to be slid towards the back side.
4) Slide the electric motor base towards the front.
5) Loosen the stopper securing screw of electric motor base as
shown in Figure 4.
6) Remove the electric motor. (4 bolts)
7) Using standard bolts and nuts, replace the electric motor.
8) Attach the other parts in the reverse order of removal.
2. Cautions
State of V-belt tension
1) While the tension per V-belt is at an appropriate deflection
amount: , set the V-belt so that the deflection weight (W)
meet the values specified in Figure 6 and Table 2.
2) After the V-belt becomes used to the pulley (after approxi-
mately 24 hours of operation), make sure the belt is not loose,
and if the belt is loose, adjust it to an appropriate tension
as described in Table2. Furthermore, if the belt is new, adjust
to approximately 1.15 times the deflection force (W).
3) After adjusting for initial stretching in 2), readjust the tension
every 2,000 hours. The belt life is over when the belt circum-
ference has stretched by 2% including the initial stretching
of the belt (approximately 1%). (After approximately 5,000
hours of operation.)
3. Tools
When loosening the securing bolts of the electric motor
base, work can be performed easier by using following tools.
Extension bar
13
75
HWE10190
Ratchet handle/9.5mm [3/8"]
190
- 59 -
Electric motor base securing bolts
Slide towards the front
i F
. g
1
Parallelism
K (min.) Notes
Pulley
10 or
Cast-iron pulley
less
Table 1
Part A
Fig. 4
Control box cover attaching screws
Fig. 5
C: Center distance(mm)
Power
Model
frequency
PFAV-P250VM-E
PFAV-P500VM-E
PFAV-P750VM-E
PFAV-P300VM-E-F
PFAV-P600VM-E-F
PFAV-P900VM-E-F
Electric motor base slide bolt
i F
. g
2
K
K
A
K
Fig. 3
Offset between the pulleys (B)
equivalent to 3 mm [1/10"] ev-
ery 1 m [3.2 ft] of the distance
between the axes (A)
Stopper
Part A Detailed View
Fig. 4
Deflection Weight(W)
=0.016
C
Fig. 6
Deflection
Amount of
force
deflection
50Hz
18.0N
6.9mm
60Hz
15.9N
6.8mm
50Hz
28.9N
3.6mm
60Hz
24.9N
3.6mm
50Hz
32.4N
4.9mm
60Hz
28.2N
4.9mm
50Hz
12.8N
6.5mm
60Hz
13.2N
6.8mm
50Hz
24.2N
3.8mm
60Hz
20.8N
3.8mm
50Hz
19.4N
5.4mm
60Hz
17.1N
5.4mm
Table 2
GB
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