Daikin Water Chilling Unit C7-UWJ3350B5Y

Close the stop valve on the condenser outlet

If the pressure switch (Low pressure protection) trips, shut compressor discharge stop valve

Do not short-circuit the pressure switch (Low pressure protection) or the temperature switch (discharge gas) for any reason whatsoever

Operate the compressor for about 15 minutes before performing pump down

Sign off on the pump down procedure

Periodically check safety devices and keep a record of checks in accordance with regulations on handling high pressure gases

Contact the place of purchase if a safety device fails to trip at its prescribed value

Values of safety devices are listed in the manufacturer’s equipment specifications

1. Pressure switch (High pressure protection)

1) Shut off condenser water supply

2) While watching the pressure gauge, check the pressure switch (high pressure protection) trips at the prescribed pressure

The pressure switch (high pressure protection) must be reset by hand (see page 48)

- Check refrigerant charge using the condenser liquid level gauge (refrigerant is within range on the gauge)

- Check refrigerant oil charge using the compressor oil gauge (refrigerant oil is within range on the gauge)

- Check water quality (according to JIS K0101 or this manual; see water quality standards on page 50);

Warning: Ensure the cooling tower is turned off before starting the cleaning process.

Is the cooling tower turned off?

If the cooling tower is not turned off, stop the procedure and turn it off.

Check for scale and fungus formation inside the cooling tower.

If scale and fungus are present, proceed with the cleaning process.

Select the cleaning method used

Was the cleaning process successful?

Note any issues encountered during the cleaning process.

Sign off on the condenser cleaning process.

To maintain the unit in prime operating condition, check the following items daily, making adjustments where necessary and keeping a record of all checks. Values under “Passing grade” are indicated for chiller under typical operating conditions.

Check discharge pressure gauge (1.1–1.7 MPa when cooling; 1.5–1.8 MPa when heating)

Check discharge pressure difference between left and right compressors (for 2-compressor circuits, max. 0.1 MPa)

Check suction pressure using the compound gauge (0.3–0.6 MPa when cooling; 0.3–0.6 MPa when heating)

Check suction pressure difference between left and right compressors (for 2-compressor circuits, max. 0.05 MPa)

Check power supply voltage with a voltmeter (within ±10% of rated voltage)

Check condenser water outlet temperature (30–40 °C)

Check chilled (hot) water outlet temperature (5–10 °C when cooling; 40–45 °C when heating)

Check for abnormal vibrations and noises (no abnormal vibrations or noises)