Troubleshooting Guide - Electric Motors - Trane GXAA Installation, Operation And Maintenance Manual

Problem
CFM High - Too
Much Air Flow
Blower Does Not
Operate
Troubleshooting Guide — Electric Motors
Problem
Motor
MUA-SVX006B-EN
Probable Solution
Cause
Duct System
1. Actual system is more restrictive than
2. Dampers closed.
3. Registers closed.
4. Leaks in supply duct.
Filters Dirty or clogged.
Coil - DX or Chilled Dirty or clogged.
Water
Obstructions in
1. Obstruction near unit outlet.
High Velocity Air
2. Sharp elbows near unit outlet.
Stream
3. Improperly designed turning vanes.
4. Projections, dampers or other obstructions
System
1. Oversized duct work.
2. Access door open.
3. Registers or grilles not installed.
4. Filters not in place.
5. System resistance lower than anticipated.
Blower Blower RPM is too great.
Installation
1. Incorrect electrical connection.
2. Wrong voltage.
3. Blown fuse.
Unit
1. Broken belt(s).
2. Loose pulleys.
3. Power to unit is disconnected.
4. Motor overload protector has broken circuit.
5. Optional thermostats, firestats, freezestats
Probable Solution
Cause
Blown fuse or open Replace fuse or reset circuit breaker.
circuit breaker
Overload trip Check and reset, if manual.
Improper line Check connections to unit wiring diagram.
connections
Improper current
Check to determine that power supply agrees
supply
with motor nameplate specifications.
Mechanical failure. Check bearings. Determine that motor and
drive turn freely.
expected.
in part of duct system where air velocity is
high.
may lockout blower operation if set
incorrect.
T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
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