Daikin REYQ168 Installation Manual download pdf (Page 44)

Installation SiUS39-506

38 General Information

Vacuum Drying

Procedure

There are two vacuum drying methods and the appropriate one should always be chosen to

conform with individual local conditions.

[Normal vacuum drying]........The standard method

[Operational steps]

1. Vacuum drying (1st time): Connect a manifold gauge to the service port of the liquid or gas pipe

and operate the vacuum pump for at least 2 hours.

(The degree of vacuum produced should be in excess of –14.61psi (–755 mmHg))

If after 2 hours the vacuum produced has not exceeded 5 mmHg then either there is moisture in

the pipe or there is a leak. Operate the vacuum pump for a further hour.

If, even after 3 hours, the vacuum has not reached –14.61 (–755 mmHg) then check the system

for a leak.

2. Carry out maintained vacuum test.

Produce a vacuum in excess of –14.61psi (–755 mmHg) and do not release it for an hour or

more. Check the vacuum gauge to make sure that it has not risen. (If the gauge does rise then

there is still moisture in the pipe or there is a leak somewhere.)

3. Additional charge of refrigerant.

Connect the charging cylinder to the liquid pipe service port and charge with the required

amount of refrigerant.

4. Open stop valve to the full.

Open the stop valves on the liquid and the gas pipes to the full.

Note: Vacuums should be produced in both the liquid and the gas pipes.

(Because there are a large number of functional components in the indoor unit which cut off the

vacuum mid–way through)

7.25psi

0psi

–14.7psi

–14.6psi

(–755mmHg)

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Daikin REYQ168 Installation Manual Page 44