Weekly Maintenance; Annual Maintenance - Lennox WA Series Installation, Operating And Maintenance

7.1 WEEKLY MAINTENANCE

1) Check the compressor oil level. This should be visible through the sightglass with the machine running at full
load. Let the compressor operate for 3 to 4 heures before adding any oil. Check the oil level every 30 minutes.
If the level does not reach the level indicated above, contact a qualified refrigeration mechanic.
2) Overcharging with oil can be as dangerous to a compressor as a lack of oil. Before topping up, contact a
qualified technician. Only use oils recommended by the manufacturer. See §3.7.6.
3) Check the oil pressure.
4) The flow of liquid refrigerant through the sightglass should be steady and without bubbles. Bubbles are a sign
of a low charge, a possible leak, or of a restriction in the liquid line. Contact a qualified technician.
Each sightglass is fitted with a humidity indicator. The colour of the element changes according to the level of
humidity in the refrigerant, but also according to temperature. It should indicate «dry refrigerant. If it shows «wet» or
«CAUTION», contact a qualified refrigeration technician.
CAUTION : When starting up the unit, run the compressor for at least 2 hours before taking a humidity reading. The
humidity detector is also sensitive to temperature, and as a consequence, the system must be at normal operating
temperature to give a meaningful reading.
5) Check operating pressures. If they are higher or lower than those recorded when the machine was put into
service, see the chapter 8.
6) Inspect the entire system so as to detect any eventual abnormality: noisy compressor, loose casing panels,
leaky pipes or juddering contacts.
7) Record temperatures, pressures, dates et times and any other observations in the service log.
8) Leak detection is recommended.

7.2 ANNUAL MAINTENANCE

It is important that unit are serviced regularly by a qualified technican, at least once every year or every 1000 hours of
operation.
Failure to observe this rule can lead to cancellation of the warranty and will clear LENNOX of whatever
responsibility.
A service visit by a qualified technician is also recommended after the first 500 hours of operation after the unit is first
put into service.
1) Inspect valves and piping. Clean the filters if necessary, clean the condenser tubes (see «cleaning the
condenser» §7.3).
2) Clean the chilled water piping filters.
CAUTION: The chilled water circuit may be pressurised. Observe the usual precautions when depressurising
the circuit before opening it. Failure to observe these rules could lead to accidents and cause injury to service
personnel.
3) Clean any corroded surfaces and repaint them.
4) Inspect the chilled water circuit for any signs of leakage.
Check operation of the water circulating pump and its ancillaries.
Check the percentage of antifreeze in the chilled water circuit, top up as necessary (if antifreeze is used).
5) Carry out all weekly maintenance duties.
Every year, the first and last inspection will include the seasonal shutdown procedure or the restarting
procedure depending on the case.
These inspections should include the following operations:
- Check the contacts of motor contactors and control devices.
- Check the adjustment and operation of each control device.
- Conduct an oil analysis to determine the acidity. Record the results.
- Change the oil if necessary.
Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 1106-E
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