Mitsubishi Electric City Multi PFAV-P500VMH-E, Руководство по обслуживанию

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[
IV
Indoor Unit Structure ]
- 44 -
HWE07150 GB
[4] Fan
Use the following procedure to replace the pulley and motor of the PFAV-P500VMH-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: 13N•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) is
within the range shown in Figure 6 and Table 2.
2) After the V-belt becomes used to the pulley (after approxi-
mately 24 hours of operation), adjust it to an appropriate
tension in accordance with Figure 6 and Table 2.
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.
Electric motor base securing bolts
Electric motor base slide bolt
Slide towards the front
A
K
K
K
B
Fig. 1 Fig. 2
Fig. 3
Part A
Stopper
Part A Detailed View
Fig. 4
Fig. 4
Fig. 5
Deflection Weight(W)
=0.016 C
C: Center distance(mm)
Fig. 6
Table 1
Parallelism
Pulley
K (min.) Notes
Cast-iron pulley
10 or
less
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)
Table 2
V-Belt Model
Small Pulley
Diameter (mm)
Deflection
Weight W(N)
B
115 to 135 22 to 28
136 to 160 26 to 33
161 or more 28 to 36
Control box cover attaching screws
13
75
10.5
18
190
17
36
27.5
„ Extension bar „ Ratchet handle/9.5mm [3/8"]