Step 9 - Adjust Evaporator-Fan Speed - Bryant DURAPAC PLUS 581B Installation & Service Instructions Manual

SETTING EQUIPMENT
1
Interface w/Standard
2
Building Control System
3
4
5
Economizer
6
7
8 Health & Safety
Parking/Air Intakes/
9
Loading Docks
LEGEND
ppm — Parts Per Million
IX. STEP 9 — ADJUST EVAPORATOR-FAN SPEED
Adjust evaporator-fan speed to meet jobsite conditions.
Tables 6A and 6B show fan rpm at motor pulley settings for
standard and alternate motors. Tables 7 and 8 show evapora-
tor fan motor data. Table 9 shows EconoMi$er IV pressure
drop. Table 10 shows sound data. Refer to Tables 11-28 for
fan performance data. See Fig. 38 for Perfect Humidity™ sys-
tem static pressure drop.
NOTE: Before adjusting fan speed, make sure the new fan
speed will provide an acceptable air temperature rise range
on heating as shown in Table 1.
To change fan speed:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting nuts.
See Fig. 39.
3. Loosen movable pulley flange setscrew (see Fig. 40).
4. Screw movable flange toward fixed flange to increase
fan speed and away from fixed flange to decrease fan
UNIT
581B
036
048
060 (single and 3-phase)
072
*Approximate fan rpm shown (standard motor/drive).
Table 6B — 581B Fan Rpm at Motor Pulley Setting With High-Static Motor*
UNIT
581B
0 1 /
2
036 1455 1423
048 1455 1423
060 1685 1589
072 1685 1589
*Approximate fan rpm shown (high-static motor/drive).
Table 5 — CO
VENTILATION
OUTPUT RATE
(cfm/Person)
Proportional Any
Proportional Any
Exponential Any
Proportional
Proportional
Exponential
Exponential
Proportional
Proportional
Table 6A — 581B Fan Rpm at Motor Pulley Setting With Standard Motor*
0 1 / 1
2
1044 1008 971
1185 1144 1102
1460 1425 1389
1585 1538 1492
1 1 1 / 2
2
1392 1360 1328
1392 1360 1328
1557 1525 1493
1557 1525 1493
Sensor Standard Settings
2
ANALOG
CONTROL RANGE
OUTPUT
0-10V
4-20 mA
2-10V
7-20 mA
0-10V
4-20 mA
0-10V
15
4-20 mA
0-10V
20
4-20 mA
0-10V
15
4-20 mA
0-10V
20
4-20 mA
0-10V
—
4-20 mA
0-10V
—
4-20 mA
speed. Increasing fan speed increases load on motor.
Do not exceed maximum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub
and tighten setscrew. (See Table 1 for speed change
for each full turn of pulley flange.)
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from
mounting plate.
To adjust belt tension:
1. Loosen fan motor mounting nuts.
2. Slide motor mounting plate away from fan scroll for
proper belt tension (
force) and tighten mounting nuts (see Fig. 39).
3. Adjust bolt and nut on mounting plate to secure
motor in fixed position.
MOTOR PULLEY TURNS OPEN
1 1 / 2 2 1 / 3
2 2
935 898 862 826
1061 1019 978 936
1354 1318 1283 1248
1445 1399 1352 1305
MOTOR PULLEY TURNS OPEN
2 1 / 3 3 1 /
2 2
1297 1265 1233
1297 1265 1233
1460 1428 1396
1460 1428 1396
— —
22
CO OPTIONAL
2
RELAY SETPOINT
(ppm) (ppm)
0-2000 1000
0-2000 1000
0-2000 1100
0-1100 1100
0- 900 900
0-1100 1100
0- 900 900
0-9999 5000
0-2000 700
1 / -in. deflection with 8 to 10 lb of
2
3 1 / 4 4 1 /
2 2
789 753 716
895 853 812
1212 1177 1141
1259 1212 1166
4 4 1 / 5
2
1202 1170 1138
1202 1170 1138
1364 1332 1300
1364 1332 1300
RELAY
HYSTERESIS
(ppm)
50
50
50
50
50
50
50
500
50
5 5 1 / 6
2
680 — —
770 — —
1106 1070 1035
1119 — —
5 1 / 6
2
1107 1075
1107 1075
— —
— —