Installation and Maintenance Manual

Maintenance
RTAE-SVX001B-EN 71
Drive Cooling System
Service Intervals
• Every (5) years, contact your localTrane office to
service drive fluid and strainer.
• On a yearly basis, a fluid pH test should be performed.
Unit Diagnostics
An improperly filled drive cooling system (either low fluid
level or entrapped air in the circuit) can result in the AFD
drive or output load inductors overheating.This condition
may result in the following diagnostics:
• AFD xA Inverter Heatsink Over Temp
• AFD xA Rectifier Heatsink OverTemp
• AFD xA Estimated Junction OverTemp
• AFD xA Load Inductor HighTemperature
A front panel warning of Low Oil Return or AFD Cooling –
CktX
does not indicate an issue with the drive cooling fluid
system, but represents a low refrigerant level reported by
the liquid level sensor for a given length of time.
If chiller diagnostics indicated drive cooling system
problem, contact your localTrane office.
pH Test
Obtain a sample of fluid from the drive cooling loop via the
loop drain located near the oil return heat exchanger.Test
for pH level using litmus paper with a 0.5 resolution.
• pH < 8 indicates fluid to be changed
• pH < 7 indicates potential component damage
Pressure Relief Cap
The pressure relief cap is an automotive style pressure-
vent radiator cap. See Figure 67, p. 71.The setting for the
relief spring is 16 lbs.The function of the relief cap can be
verified with a standard automotive radiator cap tester.
Drive Cooling ExpansionTank
Proper fluid level is important to the operation of the unit.
To verify proper level, inspect the liquid level in each of the
fluid reservoirs (located behind the chiller control panel).
See Figure 68 for fluid levels under various temperature
conditions. If levels levels are low, contact your localTrane
office.
NOTICE:
Equipment Damage!
Use only Trane HeatTransfer Fluid P/N CHM01023. This
fluid is a direct use concentration and is not to be
diluted. Do not top off with water or any other fluid.
Use of unapproved fluids, or dilution of approved fluid
could result in catastrophic equipment damage.
NOTICE:
Equipment Damage!
Drive cooling fluid and strainer must be serviced every
five (5) years. Failure to do so could result in equipment
damage.
Figure 67. Pressure relief cap
Figure 68. Drive cooling expansion tank fill
(a)
(a) Fill lines are NOT marked on tank. The A level is just below upper fitting,
C level is just above lower fitting. B is in the middle of the fittings.
Drive Cooling
Fluid
Expansion Tank
Pressure Relief Cap
A
B
C
Max Fill 70°F (21°C)
Design Fill 125°F (51.7°C)
Max Fill -20°F (-28.9°C)
Design Fill 70°F (21°C)
Min Fill 70°F (21°C)
Design Fill -20°F (-28.9°C)