Wireless Zone Sensors (Wzs) - Trane BCHE Installation, Operation And Maintenance Manual

Diagnostics and Troubleshooting
Table 43. Troubleshooting recommendations (continued)
Symptom
Low refrigerant coil capacity
Drain pan is overflowing
Standing water in drain pan
Wet interior
Excess dirt in unit
Microbial growth (mold)
inside air handler

Wireless Zone Sensors (WZS)

The receiver for all models has four LEDs: LED1, LED2,
LED3, and LED5. The following figure shows their
locations.
Note: To view LEDs on a flush mount receiver on a fan coil
unit, the front panel of the unit must be removed.
124
Probable Cause
Incorrect airflow
Expansion valve is not operating properly or is sized
incorrectly
Incorrect refrigerant charge
Condensing unit failure
Coil is piped incorrectly
Clogged refrigerant line filter
Failure of suction/liquid line components
Dirty fin surface
Fin frosting
Plugged drain line
Unit not level
Improper trap design
Improper trap design
Unit not level
Plugged drain line
Coil face velocity too high
Improper trap design
Drain pan leaks/overflows
Condensation on surfaces
Missing filters
Filter bypass
Standing water in drain pan
Recommended Action
Check fan operating condition.
Check sensing bulb temperature.
Verify valve operation.
Verify proper valve size.
Verify refrigerant charge and adjust if necessary.
Verify condensing unit operation.
Verify coil piping (see "Piping and Connections," p.
Change filter core.
Verify component operation
Clean the fin surface.
Do not use steam to clean refrigerant coils.
Verify defrost cycle operation.
Verify frostat operation.
Verify refrigerant charge.
Clean drain line
Level unit
Design trap per unit installation instructions
Design trap per unit installation instructions
Level unit
Clean drain line
Reduce fan speed
Design trap per unit installation instructions
Repair leaks
Insulate surfaces
Replace filters
Reduce filter bypass by ensuring all blockoffs are in place.
See "Standing water in drain pan" above
53.)
BCX-SVX002A-EN