Daikin Screw Chiller AWV022

Prior to this procedure, pump out the compressor. Isolate the electrical supply to the control panels and compressor motor terminal. Filter should be changed when pressure drop delta goes above the linear line in Figure 74.

After the compressor has been pumped down and isolated, the oil contained inside the filter housing will remain hot enough to cause burns for some time afterwards. Always allow sufficient time for the oil to cool down so that it is cool enough not to be a danger when drained off (less than 35°C is recommended). Severe injury from burns can result.

Oil filter assembly components are:

DANGER: Electric equipment can cause electric shock which will cause severe personal injury or death. Turn off, lock out and tag all power before continuing with following service. Panels can have more than one power source.

CAUTION: Periodically check electrical terminals for tightness and tighten as required. Always use a backup wrench when tightening electrical terminals.

Power turned off, locked out and tagged?

Checked electrical terminals for tightness?

Used a backup wrench when tightening electrical terminals?

Sign off on the electrical terminals check

Complete unit log and review. Log readings can be taken daily for a higher level of unit observation.

Electrical (including the VFDs)

Clean control box fan filter. The weekly fan filter cleaning schedule can be modified to meet job conditions. It is important that the filter allows full air flow.

Check liquid line sight glasses for clear flow

Check compressor oil sight glass for correct level (lubricant charge);

Monthly operations include all weekly operations.

- Inspect unit for loose or damaged components and visible leaks

Electrical ( * including the VFDs):

- Visually inspect components for signs of overheating

- Verify compressor and oil heater operation

- Check filter-drier pressure drop. Replace the filter if pressure drop exceeds 20 psi.;

Annual (or spring startup) operations include all weekly and monthly operations.

- Inspect thermal insulation for integrity

Electrical ( * including the VFDs):

- Check contactors for pitting, replace as required

- Check terminals for tightness, tighten as necessary