CGAD-SVN02C-EN
22
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 /-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 warranty will be void.
Summary of Contents for CGAD020
Page 36: ...CGAD SVN02C EN 36 Wiring Diagram Fig 17 Power and command wiring diagram CGAD 020C Sheet 1 2...
Page 52: ...CGAD SVN02C EN 52 Wiring Diagram Fig 33 Power and command wiring diagram CGAD 070C Sheet 1 2...
Page 60: ...CGAD SVN02C EN 60 Wiring Diagram Fig 41 Power and command wiring diagram CGAD100 Part I...
Page 61: ...CGAD SVN02C EN 61 Wiring Diagram Fig 42 Power and command wiring diagram CGAD100 Part II...
Page 62: ...CGAD SVN02C EN 62 Wiring Diagram Fig 43 Power and command wiring diagram CGAD100 Part III...
Page 63: ...CGAD SVN02C EN 63 Wiring Diagram Fig 44 Layout diagram CGAD100...
Page 64: ...CGAD SVN02C EN 64 Wiring Diagram Fig 45 Power and command wiring diagram CGAD120 Part I...
Page 65: ...CGAD SVN02C EN 65 Wiring Diagram Fig 46 Power and command wiring diagram CGAD120 Part II...
Page 66: ...CGAD SVN02C EN 66 Wiring Diagram Fig 47 Power and command wiring diagram CGAD 120 Part III...
Page 67: ...CGAD SVN02C EN 67 Wiring Diagram Fig 48 Layout diagram CGAD 120...
Page 68: ...CGAD SVN02C EN 68 Wiring Diagram Fig 49 Power and command wiring diagram CGAD150 Part I...
Page 69: ...CGAD SVN02C EN 69 Wiring Diagram Fig 50 Power and command wiring diagram CGAD150 Part II...
Page 70: ...CGAD SVN02C EN 70 Wiring Diagram Fig 51 Power and command wiring diagram CGAD150 Part III...
Page 71: ...CGAD SVN02C EN 71 Fig 52 Layout diagram CGAD150 Wiring Diagram...
Page 72: ...CGAD SVN02C EN 72 Wiring Diagram Fig 53 Layout diagram CGAD 100 125 150 with optionals...