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M M a a i i n n t t e e n n a a n n c c e e
•
AFD xA Over Temperature
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 local Trane 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 below. 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.
Figure 63. Pressure relief cap
Pressure Relief Cap
Drive Cooling
Fluid
Expansion
Tank
Drive Cooling Expansion Tank
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 below for fluid levels under
various temperature conditions. If levels levels are low,
contact your local Trane office.
82
Figure 64. Drive cooling expansion tank fill
A
B
C
N N o o t t e e : : Fill lines are NOT marked on tank. The A level is
just below upper fitting. C level is above lower
fitting. B is in the middle of the fittings.
Condenser Coil Corrosion
Protection Inspection
Perform coil inspection each time coils are cleaned.
Inspect corrosion protection at each coil refrigerant
connection where the copper tube joins the aluminum
manifold. If damaged or missing, wrap new Prestite
Insulated tar tape (STR01506) on joint to cover area
from the aluminum header body to at least 2 inches of
the copper tube. Seal insulation using hand pressure.
Rubber gloves are suggested when handling
insulation.
N N o o t t e e : : Prestite insulated tar tape is required for all units
at each copper/aluminum connection. This
requirement is NOT associated with the coated
coil option.
Condenser Coil Cleaning
Coil Cleaning Interval
Clean condenser coils at least once a year or more
frequently if it is in a "dirty" environment. A clean
condenser coil will help maintain chiller operating
efficiency.
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)
AC-SVX001A-EN
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