80
AC-SVX001A-EN
intermediate oil.
2. Observe liquid line sight glass on EXV. If liquid line
sight glass has bubbles measure the subcooling
entering the EXV. Subcooling should always be
greater than 10°F.
3. Inspect the entire system for unusual operation.
4. Inspect the condenser coils for dirt and debris. If the
coils are dirty, see Condenser Coil Corrosion
Protection Inspection section of Maintenance
chapter.
NNOOTTIICCEE
CCooiill DDaammaaggee!!
UUssee ooff ddeetteerrggeennttss ccoouulldd ccaauussee ddaammaaggee ttoo ccooiillss..
DDoo nnoott uussee ddeetteerrggeennttss ttoo cclleeaann ccooiillss.. UUssee cclleeaann
wwaatteerr oonnllyy..
Monthly
1. Perform all weekly maintenance procedures.
2. Record the system subcooling.
Annual
1. Perform all weekly and monthly procedures
2. Check oil sump oil level while unit is off. See Oil
Sump Level Check section of Maintenance chapter.
3. Perform pH test of drive cooling fluid. See pH Test
section of Maintenance chapter.
4. Have a qualified laboratory perform a compressor
oil analysis to determine system moisture content
and acid level.
5. Contact a Trane service organization to leak test the
chiller, to check operating and safety controls, and
to inspect electrical components for deficiencies.
6. Clean and repaint any areas that show signs of
corrosion.
7. Clean the condenser coils. See Condenser Coil
Corrosion Protection Inspection section of
Maintenance chapter.
NNOOTTIICCEE
CCooiill DDaammaaggee!!
UUssee ooff ddeetteerrggeennttss ccoouulldd ccaauussee ddaammaaggee ttoo ccooiillss..
DDoo nnoott uussee ddeetteerrggeennttss ttoo cclleeaann ccooiillss.. UUssee cclleeaann
wwaatteerr oonnllyy..
Refrigerant and Oil Charge
Management
Proper oil and refrigerant charge is essential for proper
unit operation, unit performance, and environmental
protection. Only trained and licensed service personnel
should service the chiller.
The following table lists baseline measurements for
chillers running at AHRI standard operating conditions.
If chiller measurements vary significantly from values
listed below, problems may exist with refrigerant and
oil charge levels. Contact your local Trane office.
NNoottee:: Low temperature applications units will have
values that vary from the following table.
Contact your local Trane office for more
information.
Table 25. Typical baselines (AHRI conditions)
Measurement Baseline
Evaporator Pressure 51 psia
Evaporator Approach
3.4°F
EXV Position (150 to 200T units) 45-50% open
EXV Position (225 to 300T units) 61-64% open
Evaporator ΔT - entering
54°F
Evaporator ΔT - leaving
44°F
Discharge Superheat
16.5°F
Condenser Pressure
212 psia
Subcooling
10 to 20°F
Lubrication System
The lubrication system has been designed to keep
most of the oil lines filled with oil as long as there is a
proper oil level in the oil sump.
Oil Sump Level Check
The oil level in the sump can be measured to give an
indication of the system oil charge. Follow the
procedures below to measure the level.
1. Run the unit as near to full load as possible for a
minimum of 30 minutes. For an accurate reading,
40 or more minutes at full load with normal/steady
discharge superheat readings and no limits/
warnings is recommended. Assessing oil charge
after running at minimum or low loads may lead to
an inaccurate reading.
2. Cycle the compressor off line.
3. Let the chiller sit (powered, but off line) to allow the
oil separator heater to boil off the refrigerant that
may be in the oil separator. An initial assessment of
the oil separator level may be made after 30
minutes of heater ON dwell time, but oil charge
adjustments should not be made without allowing
the oil heaters to run for a minimum of 4 hours.
MMaaiinntteennaannccee
To Next Page
Loading...
Need help?
General