CGAD-SVN02C-EN22
Periodic Preventive Maintenance
Carry out all the maintenance inspections
and services at the recommended
intervals. This will prolong the equipment's
durability and will reduce the possibility of
the equipment failing.
Use the "Operational Reading Datasheet"
to record on a weekly basis the operational
conditions for this unit. The sheet with the
operational data could be a valuable
diagnostic tool for the technical assistance
team. By writing down trends of the
operating conditions, the operator can
frequently foresee and avoid problem
situations before they become serious. If
the unit does not operate correctly, go to
"Troubleshooting".
Weekly Maintenance
Once the equipment has been operating
for approximately 10 minutes and the
system is stabilized, check the operational
conditions and follow this checklist of
procedures:
[ ] Check the oil level in the compressors.
The oil level should be visible at the sight
glass of the casing when the compressor
is working. Operate the compressor for at
least 3 or 4 hours before checking the oil
level and then check it every 30 minutes. If
the oil has not reached to an adequate
level after this period, a qualified technician
should add or remove oil. Check on Table
4 the recommended charges of refrigerant
and of oil.
[ ] Check the suction and discharge
pressures in the unit's pressure gauges.
Read "Checking Operational Conditions"
Oil level Visible when compressor is running
High pressure 200 to 340 psig
Lowpressure 55 to 80 psig
Overheating from 6 to 10°C
Subcooling from 5 to 10°C
Liquid sight glass Refrigerant flow without gas traces
Voltage M ust not excede +/-10%of nameplate voltage
Current M ust not be over nameplate current
Evaporation temperature
- 2,0°C to +8 C. Normal value = 5°C below chilled water
leaving temperature.
Condensing temp.(Air-Cond) 38°C to 60°C . Normal value 20°C above entering air temp.
Operational
Procedures
Table 07 - Overheating and subcooling adjustmen7
[ ] Check the liquid line sight glass. Read
"Checking Operational Conditions"
[ ] If the operational conditions and the
liquid sight glass indicate a lack of gas,
measure the system's superheat and
subcooling. See items "Superheat of the
system" and "Subcooling of the system".
[ ] If the operational conditions indicate an
overcharge, then slowly (to minimize the
losses of oil) remove refrigerant through
the service valve located on the liquid line.
[ ] Inspect the system in order to detect
Annual Maintenance
[ ] Do all the services listed for weekly and
monthly recommended maintenance.
[ ] Have a qualified technician check the
calibration and operation of each control
and inspect and replace any contacts or
controls if needed.
[ ] If the chiller does not have a tube drain,
be sure that the drain is clean for draining
all the water.
[ ] Drain the system's condenser and
evaporator water and tubing. Inspect all the
components for leaks and damages.
Clean all water filters.
[ ] Inspect the condenser tubes and clean
if necessary.
[ ] Clean and repair any surface that is
corroded.
[ ] Inspect the expansion valve bulb and
see if it needs cleaning. Clean if
necessary.
The bulb should have an excellent contact
with the suction line and be appropriately
insolated.
abnormal conditions. Use the reading
datasheet as mentioned to weekly record
the unit's conditions. A reading datasheet
that is filled out is a valuable tool for the
technical assistance team.
Monthly Maintenance
[ ] Do all the services listed for weekly
maintenance.
[ ] Measure and record the system's
superheat.
[ ] Measure and record the system's
subcooling.
CAUTION:
All the tests done on the pressure
regulators should be done with
reliable pressure gauges. These
safety devices are calibrated at the
factory and sealed. If violated, the
warranty will be void.
!
To avoid accidents from freezing,
don't let your skin com in contact
with the refrigerant.
CAUTION:!
CAUTION:!
All the tests done on the pressure
switches should be done with reliable
pressure gauges. These safety devices
are calibrated at the factory and sealed.
If violated, the warrantywill be void.
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