Mitsubishi Electric PFAV-P250VM-E Data Book page 42

How to choose the pulley
(EXAMPLE)
Indoor unit : PFAV-P750VM-E (50Hz)
Required external static pressure : 600 Pa
Required air flow rate : 250m
50Hz
······Standard
1100
1
1000
2
900
3
800
4
700
5
600
6
7
500
8
400
9
10
300 11
12
13
200
100
0
220 240 260
Airflow rate < m
Rotational
Outside
speed
No.
diameter (A)
<rpm>
<ø>
1 1193 211
2 1134 201
1083 235
3
4 1025 223
976 223
5
6 918 201
875 201
7
8 822 181
773 171
9
10 725 161
701 156
11
12 653 146
13 621 146
Note1. Use two V-belts for P750 indoor unit.
Note 1. When replacing the motor on site, reset the thermal relay accordingly.
Note 2. Mitsubishi Electric shall not be held responsible for the pulley or motor modified on site.
/min
3
7.5kW
Internal resistance
280 300 320 340
/ min >
3
Motor 7.5kW,1450rpm <50Hz>
Motor pulley
Nominal Outside Nominal
(C) (D) Bore (E) (F) (G)
Diameter (B) diameter (A) Diameter (B)
<ø> <ø> <ø> <mm> <mm>
<ø> <ø>
200 181 80 38 41.3 10 254
190 171 71 38 41.3 10 254
224 205 80 38 41.3 10 311
212 193 80 38 41.3 10 311
212 193 80 38 41.3 10 326
190 171 71 38 41.3 10 311
190 171 71 38 41.3 10 326
170 151 71 38 41.3 10 311
160 141 71 38 41.3 10 311
150 131 71 38 41.3 10 311
145 126 71 38 41.3 10 311
135 116 63 38 41.3 10 311
135 116 63 38 41.3 10 326
The fan characteristic curve shows the internal resistance
is 100 Pa when the air flow rate is 250m
Total static pressure =
internal resistance + external static pressure
=100 Pa + 600 Pa
=700 Pa
Read the intersection point of the total static pressure 700
Pa and the air flow rate 250m
curve. You will see that the set of pulleys No.4 is suitable
under the condition.
The left table shows the details of appropriate pulley
combinations.
Motor pulley : ø212-B-2-38
Fan pulley : ø300-B-2-32
V-belt : B57/1448 mm
Fan pulley
V-belt (H)
Deflection
(C) (D) Bore (E) (F) (G) <mm / in>
force
<ø> <ø> <ø> <mm> <mm>
<ø>
243 224 70 32 36 10 1321 / 52 23.9
243 224 70 32 36 10 1321 / 52 25.3
300 281 90 32 36 10 1448 / 57 23.3
300 281 90 32 36 10 1448 / 57 24.2
315 296 90 32 36 10 1448 / 57 24.2
300 281 90 32 36 10 1423 / 56 25.6
315 296 90 32 36 10 1423 / 56 26.4
300 281 90 32 36 10 1372 / 54 28.4
300 281 90 32 36 10 1372 / 54 29.6
300 281 90 32 36 10 1347 / 53 31.6
300 281 90 32 36 10 1347 / 53
32.4
300 281 90 32 36 10 1347 / 53 34.4
315 296 90 32 36 10 1347 / 53
35.5
40
3 /min.
/min in the fan characteristic
3
Amount
of
Deflection
5.0
5.1
4.9
5.1
4.8
5.1
4.8
4.9
4.9
4.8
4.9
5.0
4.7