102777-YIM-E-0206
64
Unitary Products Group
1.
Remove the dot plugs from the two 5/16 inch holes in the
blower motor and the filter access doors.
2.
Insert at least 8 inch of 1/4 inch metal tubing into each of
these holes for sufficient penetration into the air flow on
both sides of the indoor coil.
3.
Using an inclined manometer, determine the pressure
drop across a dry evaporator coil. Since the moisture on
an evaporator coil may vary greatly, measuring the pres-
sure drop across a wet coil under field conditions would
be inaccurate. To assure a dry coil, the compressors
should be de-activated while the test is being run.
4.
Knowing the pressure drop across a dry coil, the actual
CFM through the unit with clean 2 inch filters, can be
determined from the curve in Figure 61 and 62.
After readings have been obtained, remove the tubes and
reinstall the two 5/16 inch dot plugs.
NOTE:
De-energize the compressors before taking any test
measurements to assure a dry evaporator coil.
TABLE 34: BELT ADJUSTMENT
FAN MOTOR HORSE POWER
5
7.5
10
15
20
25
30 TON FORWARD CURVED SUPPLY FAN
SIZE: 22 X 20
Belt Deflection Force (lbs) new belts
-
-
10.5
12.6
15.2
22.1
Belt Deflection Force (lbs) old belts
-
-
7.1
8.5
10.2
14.8
40 TON FORWARD CURVED SUPPLY FAN
SIZE: 25 X 20
Belt Deflection Force (lbs) new belts
-
-
10.5
12.6
15.2
15.2
Belt Deflection Force (lbs) old belts
-
-
7.1
8.5
10.2
10.2
30 & 40 TON POWER EXHAUST FAN
SIZE: (2) 15 X 15
Belt Deflection Force (lbs) new belts
-
7.9
9.4
9.4
-
-
Belt Deflection Force (lbs) old belts
-
5.3
6.3
6.3
-
-
25 TON FORWARD CURVE SUPPLY FAN
SIZE: 22 X 20
New Belt
-
10.5
10.5
12.6
15.2
-
Old Belt
-
7.1
7.1
8.5
10.2
-
25 TON POWER EXHAUST
New Belt
10.5
10.5
12.6
-
-
-
Old Belt
7.1
7.1
8.5
-
-
-
Failure to properly adjust the total system air quan-
tity can result in extensive blower damage.
Содержание MILLENNIUM Y22
Страница 47: ...102777 YIM E 0206 Unitary Products Group 47 FIGURE 20 ALTITUDE TEMPERATURE CONVERSION FACTOR ...
Страница 50: ...102777 YIM E 0206 50 Unitary Products Group FIGURE 21 FAN PERFORMANCE 25 TON ...
Страница 53: ...102777 YIM E 0206 Unitary Products Group 53 FIGURE 22 FAN PERFORMANCE 30 TON ...
Страница 56: ...102777 YIM E 0206 56 Unitary Products Group FIGURE 23 FAN PERFORMANCE 40 TON ...
Страница 62: ...102777 YIM E 0206 62 Unitary Products Group FIGURE 25 POWER EXHAUST TWO FORWARD CURVED FANS 30 40 TONS ...
Страница 126: ...102777 YIM E 0206 126 Unitary Products Group FIGURE 52 TYPICAL CONTROL WIRING ...
Страница 127: ...102777 YIM E 0206 Unitary Products Group 127 FIGURE 53 LEGEND ...
Страница 128: ...102777 YIM E 0206 128 Unitary Products Group FIGURE 54 TYPICAL 25 TON POWER WIRING ...
Страница 129: ...102777 YIM E 0206 Unitary Products Group 129 FIGURE 55 TYPICAL 30 40 TON POWER WIRING ...
Страница 130: ...102777 YIM E 0206 130 Unitary Products Group FIGURE 56 TYPICAL GAS HEAT WIRING ...
Страница 134: ...102777 YIM E 0206 134 Unitary Products Group FIGURE 58 25 TON CHARGING CURVE ...
Страница 138: ...102777 YIM E 0206 138 Unitary Products Group FIGURE 62 PRESSURE DROP DRY EVAPORATOR COIL VS SUPPLY AIR CFM 30 40 TON ...
Страница 139: ...102777 YIM E 0206 Unitary Products Group 139 ...