Trane CXPA 050, Installation Operation & Maintenance

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SSC-SVN001H-EN 13
Preventive Maintenance
Periodical Preventive
Maintenance
Record operation conditions for
this unit monthly. The operation da-
tasheet can be a precious diagnos-
tic tool for service personnel. By no-
ticing trends in operating conditions
the operator can often anticipate
and prevent problem situations be-
fore they become serious.
If the unit is not operating proper-
ly, refer to the section on abnormal
conditions at the end of this manual.
Weekly Maintenance
When the equipment is operating for
approx. 30 minutes and the system
is stable, check the operating condi-
tions and perform the following che-
cking procedures:
Clean permanent air filters more
regularly, depending on the job
site.
Monthly Maintenance
Clean the permanent air filter.
Throwaway filters should be re -
placed.
Check fan belt tension, align-
ment and condition.
Clean the fan volute.
Re-tighten all terminal screws.
Clean the evaporator tray, the
hose and the condensate water
drain.
Check the liquid line sight glass.
Leak-test and repair, if required.
When the liquid sight glass and
the operational conditions indi-
cate lack of gas, measure the
system superheating and subco-
oling.
When operational conditions in-
dicate overload, remove the re-
frigerant slowly (to minimize oil
losses) through the Schrader
service valve in the liquid line.
Inspect the system to detect ab-
normal conditions. Use a reading
sheet to record unit conditions. A
reading sheet can be a precious
tool for service personnel.
Quarterly Maintenance
Perform all monthly maintenance
tasks.
Check bearing and shave fixing
screws and adjust then, if requi-
red.
Clean the condenser more often,
depending on the job site.
Clean the evaporator more of-
ten, depending on the job site.
Check and write down fan motor
and compressor operation volta-
ges and currents.
Test safety controls.
Check and write down evapora-
tor entering and leaving dry bulb
and wet bulb temperatures.
Check suction and discharge
pressures with the manifold.
Measure and record the system
superheating.
Measure and record the system
subcooling.
Annual Maintenance
Perform all recommended mon-
thly and quarterly maintenance
tasks.
Have a qualified technician to
check the adjustment and opera-
tion of each control, and inspect
and replace contactors or con-
trols, if required.
Remove the cabinet panels and
remove rust spots.
Replace the thermal insulation
and defective gaskets.
Repair the external and internal
painting, if required.
Remove rust.
Inspect and clean the condenser
pipes, if required.
Inspect the expansion valve
bulb. Clean it, if required. The
contact between the bulb and
the suction line should be excel-
lent, and the bulb should the pro-
perly insulated.
Measure the electrical insulation
of the compressor motor.
IMPORTANT
Not Performing preventive mainte-
nance tasks in the equipment may
lead to impaired performance and
even void the equipment warranty.
IMPORTANT
Perform all inspections and mainte-
nance services at the recommended
intervals. This will increase equip-
ment life and reduce possible equi-
pment failures.