Daikin Water Chilling Unit C7-UWJ1320B5Y

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);

Caution: Never touch parts which tend to become hot such as compressors and refrigerant piping. Doing so could result in skin burning. Do not attempt to run the compressor by pushing the magnetic contactor with your finger. Doing so could result in electrical shock or fire.

Check open-closed state of all valves before usage. Are they in accordance with the operation manual and nameplate?

Are safety valves open while the equipment is running?

If valves are open or closed when they shouldn't be, water may leak. In worse cases, the equipment may catch fire or explode.

Before inspecting: It would be a good idea to read “SAFETY” once more before starting inspection. Be sure to let other maintenance technicians know that you are going to inspect the chiller. Push the STOP/RESET button to stop the unit. Place an “under inspection” warning sign on the switch box.

Check if the water volume is out from the operating range due to the strainer being clogged or the flow regulating valve being out of adjustment.

Check if there is air in the water piping system.

Clean the strainer periodically. Is it clean?

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

Is the condenser visibly dirty?

If the condenser is not dirty, no cleaning is required. If it is dirty, proceed with the cleaning process.

Is the cooling tower running for long periods of time?

If yes, scale and fungus may form inside, lowering cooling capacity and possibly causing safety devices to trip.

Is the water quality in your area reliable?

If no, clean the condenser more frequently.

Record any observations or issues during the cleaning process.

Sign off on the condenser cleaning

Warning: This check requires trained personnel with PPE!

Is the condenser water circulation affected by concentration of dissolved oxygen?

If yes, forced-blow water lines (repeatedly drain and refill the system to prevent water quality deterioration)

Is the cooling tower running for long periods of time?

If yes, water quality may deteriorate, leading possibly to scale deposits or corrosion inside the condenser. Contact your DAIKIN dealer for details.

Is the cooling tower equipped for forced-blow?

If no, periodically change water inside.

Is the water reddened due to rust?

If yes, this causes no problem for normal operation.