7
3. Remove the belt by gently lifting the old belt over one of
the pulleys.
4. Install the new belt by gently sliding the belt over both
pulleys and then sliding the motor and plate away from the
fan housing until proper tension is achieved.
5. Check the alignment of the pulleys, adjust if necessary.
6. Tighten all bolts and torque to 65 to 70 in.-lb (7.4 to
7.9 Nm).
7. Check the tension after a few hours of runtime and read-
just as required.
ADJUSTABLE-PITCH PULLEY ON MOTOR
The motor pulley is an adjustable-pitch type that allows a ser-
vicer to implement changes in the fan wheel speed to match as-
installed ductwork systems. The pulley consists of a fixed
flange side that faces the motor (secured to the motor shaft)
and a movable flange side that can be rotated around the fixed
flange side that increases or reduces the pitch diameter of this
driver pulley. (See Fig. 10.)
Fig. 10 — Supply-Fan Pulley Adjustment
As the pitch diameter is changed by adjusting the position of
the movable flange, the centerline on this pulley shifts laterally
(along the motor shaft). This creates a requirement for a re-
alignment of the pulleys after any adjustment of the movable
flange. Reset the belt tension after each realignment.
Inspect the condition of the motor pulley for signs of wear.
Glazing of the belt contact surfaces and erosion on these sur-
faces are signs of improper belt tension and/or belt slippage.
Replace pulley if wear is excessive.
CHANGING THE FAN SPEED:
1. Shut off unit power supply. Use proper lockout/tag-out
procedures.
2. Loosen belt by loosening fan motor mounting nuts. (See
Fig. 8.)
3. Loosen movable pulley flange setscrew. (See Fig. 10.)
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed.
Increasing fan speed increases load on motor. Do not
exceed the maximum specified speed.
5. Set movable flange at nearest keyway of pulley hub.
Tighten setscrew and torque to 65 to 70 in.-lb (7.4 to
7.9 Nm).
ALIGNING BLOWER AND MOTOR PULLEYS:
1. Loosen blower pulley setscrews.
2. Slide blower pulley along blower shaft. Make angular
alignment by loosening motor mounting plate front and
rear bolts.
3. Tighten blower pulley setscrews and motor mounting
bolts. Torque bolts to 65 to 70 in.-lb (7.4 to 7.9 Nm).
4. Recheck belt tension.
BEARINGS
The fan system uses bearings featuring concentric split locking
collars. A Torx T-25 socket head cap screw is used to tighten
the locking collars. Tighten the locking collar by holding it
tightly against the inner race of the bearing. Tighten the socket
head cap screw. Torque cap screw to 65 to 70 in.-lb (7.4 to
7.9 Nm). See Fig. 11. Check the condition of the motor pulley
for signs of wear. Glazing of the belt contact surfaces and ero-
sion on these surfaces are signs of improper belt tension and/or
belt slippage. Pulley replacement may be necessary.
Fig. 11 — Tightening Locking Collar
STAGED AIR VOLUME CONTROL — 2 SPEED
FAN WITH VARIABLE FREQUENCY DRIVE
(VFD)
2-Speed Indoor Fan Motor System
The 2-speed indoor fan motor system utilizes a fan speed control
board and Variable Frequency Drive (VFD) to automatically ad-
just the indoor fan motor speed in sequence with the unit’s venti-
lation, cooling, and heating operation. Per ASHRAE 90.1 stan-
dard, during the first stage of cooling operation the 2-speed in-
door fan motor system will adjust the fan motor to provide 66%
of the design airflow rate for the unit. When the call for the sec-
ond stage of cooling is required, the 2-speed indoor fan motor
system will allow the design airflow rate for the unit established
(100%). During the heating mode, the 2-speed indoor fan motor
system will allow total design airflow rate (100%) operation.
During ventilation mode, the 2-speed indoor fan motor system
will operate the fan motor at 66%.
Identifying Factory Option
This supplement only applies to units that meet the criteria de-
tailed in Table 3. If the unit does not meet that criteria, discard
this document.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in premature
wear and damage to equipment.
Do not use a screwdriver or a pry bar to place the new V-
belt in the pulley groove. This can cause stress on the V-belt
and the pulley resulting in premature wear on the V-belt
and damage to the pulley.
STRAIGHT EDGE
MUST BE PARALLEL
WITH BELT
SETSCREWS
MOTOR AND
FANSHAFTS
MUST BE
PARALLEL
FIXED FLANGE
MOVABLE
FLANGE
SINGLE - GROOVE
FAN PULLEY
MOTOR PULLEY
T --- 25 TORX SOCKET
HEAD CAP SCREW
LOCKING COLLAR
Содержание Preferred 581J04-14
Страница 36: ...36 Fig 60 Integrated Gas Control IGC Board RED LED STATUS ...
Страница 44: ...44 Fig 65 RTU Open Overlay for Economizer Wiring ...
Страница 45: ...45 Fig 66 VFD Overlay for W2770 Controller Wiring ...
Страница 96: ...96 Fig B 581J 04 06 YAC Control Diagram 208 1 60 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 99: ...99 Fig E 581J 07A B C YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 100: ...100 Fig F 581J 08 09 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 101: ...101 Fig G 581J 11YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 102: ...102 Fig H 581J 12 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 103: ...103 Fig I 581J 04 06 YAC Power Diagram 208 230 1 60 APPENDIX D WIRING DIAGRAMS ...
Страница 104: ...104 Fig J 581J 04 06 YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 105: ...105 Fig K 581J 04 06 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 106: ...106 Fig L 581J 07 12D F YAC Power Diagram 208 230 3 60 460 3 60 6 Ton 2 Stage with Cooling APPENDIX D WIRING DIAGRAMS ...
Страница 108: ...108 Fig N 581J 07 12A B C YAC Power Diagram 208 230 3 60 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 109: ...109 Fig O 581J 07 12A B C YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 110: ...110 Fig P 581J 08 09 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 111: ...111 Fig Q 581J 08 09 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 112: ...112 Fig R 581J 11 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 113: ...113 Fig S 581J 11 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 114: ...114 Fig T 581J 11 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 115: ...115 Fig U 581J 12 YAC Power Diagram 230 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 116: ...116 Fig V 581J 12 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 117: ...117 Fig W 581J 14 YAC Control Diagram 208 230 3 60 460 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 118: ...118 Fig X 581J 14 YAC Power Diagram 208 230 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 119: ...119 Fig Y 581J 14 YAC Power Diagram 460 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 120: ...120 Fig Z 581J 14 YAC Power Diagram 575 3 60 APPENDIX D WIRING DIAGRAMS ...
Страница 121: ...121 Fig AA 581J 04 06 YAC Control Diagram 230 1 60 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 122: ...122 Fig AB 581J 07A B C YAC Control Diagram 230 1 60 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 123: ...123 Fig AC 581J 08 09 YAC Control Diagram 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 124: ...124 Fig AD 581J 11 YAC Control Diagram 230 1 60 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 125: ...125 Fig AE 581J 12 YAC Control Diagram 230 460 575 3 60 with Dehumidification APPENDIX D WIRING DIAGRAMS ...
Страница 126: ...126 Fig AF 581J 04 06 YAC Power Diagram 208 230 1 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 127: ...127 Fig AG 581J 04 06 YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 128: ...128 Fig AH 581J 04 06 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 129: ...129 Fig AI 581J 07A B C YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 130: ...130 Fig AJ 581J 07A B C YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 131: ...131 Fig AK 581J 08 09 YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 132: ...132 Fig AL 581J 08 09 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 133: ...133 Fig AM 581J 11 YAC Power Diagram 208 230 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 134: ...134 Fig AN 581J 11 YAC Power Diagram 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 135: ...135 Fig AO 581J 11 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 136: ...136 Fig AP 581J 12 YAC Power Diagram 230 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 137: ...137 Fig AQ 581J 12 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 138: ...138 Fig AR 581J 14 YAC Control Diagram 230 460 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 139: ...139 Fig AS 581J 14 YAC Power Diagram 208 230 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 140: ...140 Fig AT 581J 14 YAC Power Diagram 460 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 141: ...141 Fig AU 581J 14 YAC Power Diagram 575 3 60 with Perfect Humidity System APPENDIX D WIRING DIAGRAMS ...
Страница 142: ...142 Fig AV YAC Direct Digital System Control Wiring Diagram System 50HE500891 F APPENDIX D WIRING DIAGRAMS ...
Страница 143: ...143 Fig AW RTU Open Wiring Diagram APPENDIX D WIRING DIAGRAMS ...