Troubleshooting Guide - Dx Cooling Coil - Trane GRAA Installation, Operation And Maintenance Manual

Problem
Drive fails to
adjust
Troubleshooting Guide — DX Cooling Coil
Problem
No or Insufficient
Cooling
Water in
Conditioned Air
N N o o t t e e : : *Refer to condensing unit installation and service manual.
MUA-SVX003B-EN
Probable
Cause
Driver and driven
shafts shifted from
parallel
Belt cord section
damaged during
installation
Fretting corrosion
(drive allowed to
operate at one
speed over a
period of time)
Probable
Cause
Coil icing
Air binding
Thermal expansion
valve**
Insufficient air flow
Air bypassing coil
Undersized
system, demand
exceeding cooling
system capacity
Too much outside
air
Refrigerant leak
Low liquid pressure
Exceeding coil face
velocity - 600 fpm.
Drain pan p-trap
clogged.
**Refer to thermal expansion valve installation instruction.
Solution
Realign drive.
Replace belts and install properly.
Driver pulley must be disassembled, cleaned
and lubricated, then reassembled.
Solution
1. Low liquid line pressure.*
2. Thermal expansion valve.**
3. Low air flow across coil.
Purge and charge system.
1. Bulb mounted at incorrect location.
2. Bulb not secured properly.
1. See air blower troubleshooting.
2. Clogged coil
Caulk safe off.
Replace system.*
Check outside air dampers.
Determine leak location and correct.
Determine cause and correct.*
Reduce unit air flow.
Clean pan and p-trap.
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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