Sinclair SF-250F3, Service Manual, Page: 37 / 44

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
The unit falls correctly towards the drainage outlet and the trap;

The heat-exchangers are clean;

The electrical connections are correct;

The screws holding the cables are well tightened;

The supply voltage is as required;

The power consumption of the blower is correct and does not exceed the maximum permitted.
12.5 Maintenance
Caution:

Maintenance work must only be carried out by qualified technicians authorized to work on air-conditioning
and refrigeration systems.

Use suitable work gloves.

Do not use pointed objects through the air intake grilles.

Disconnect the power supply before cleaning and maintenance.

Use dry cloth to clean the unit.

Always disconnect the unit from the mains power supply at the main isolator switch before carrying out
maintenance work or checks. Make sure that no one accidentally supplies power to the machine; lock the
main switch in the Off position.
Scheduled maintenance

Once a month
Check the state of cleanliness of the air filters. The air filters are made of fibre and can be washed in water. The
state of cleanliness of the filters must be checked regularly at the start of the operating season and on a monthly
basis.

Every six months
Check the state of cleanliness of the heat-exchanger and the condensation drain-tube.
Switch off the unit, remove the casing of the machine and check the state of the heat-exchanger and the
condensation drain-tube if necessary:
1. Remove any obstacle from the surface which may obstruct air flow;
2. Clean the dust with a jet of compressed air;
3. Wash and brush gently with water;
4. Dry with a jet of compressed air;
5. Check that there are no obstacles in the condensation drain tube which could prevent the normal flow of
water.
Release the air in the water system.
1. Remove the casing of the machine (for casing type);
2. Start the system and run for a few minutes;
3. Stop the system;
4. Loosen the release screw on the inlet manifold and release the air.
5. Repeat the operation several times until no more air comes out of the system.
At the end of the season
To avoid the risk of rupture due to freezing, it is advisable to drain the water from the system at the end of
every season.
Check the electrical circuit
The following operations are recommended for the maintenance of the electrical circuit:
Tighten the electrical contacts and terminals;
Check the unit’s power using a clip-on ammeter and compare with the values shown on the document.
Motor to replace, follow the steps below:
a) Unplug the unit.
b) As shown in Figure 12.5.1, remove screws
①
*2 and
②
*2 and then the casing.