Daikin EHYHBX08AFV3 [78/252] Installation

7 | Installation

Installer reference guide

EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA

Daikin Altherma hybrid heat pump

4P355634-1F – 2020.10

2 Check for leaks by applying the bubble test solution to all connections.

3 Discharge all nitrogen gas.

7.8.4 To perform vacuum drying

Connect the vacuum pump and manifold as follows:

a d

g h i

a Pressure meter

b Gauge manifold

c Low pressure valve (Lo)

d High-pressure valve (Hi)

e Charging hoses

f Vacuum pump

g Service port

h Valve lids

i Gas stop valve

j Liquid stop valve

1 Vacuum the system until the pressure on the manifold indicates −0.1 MPa

(−1bar).

2 Leave as is for 4-5minutes and check the pressure:

If the pressure… Then…

Does not change There is no moisture in the system.

This procedure is finished.

Increases There is moisture in the system. Go

to the next step.

3 Vacuum the system for at least 2hours to a manifold pressure of −0.1MPa

(−1bar).

4 After turning the pump OFF, check the pressure for at least 1hour.

5 If you do NOT reach the target vacuum or CANNOT maintain the vacuum for

1hour, do the following:

▪ Check for leaks again.

▪ Perform vacuum drying again.

NOTICE

Be sure to open the gas stop valve after piping installation and vacuuming. Running

the system with the valve closed, the compressor may break down.

INFORMATION

After opening the stop valve, it is possible that the pressure in the refrigerant piping

does NOT increase. This might be caused by e.g. the closed state of the expansion

valve in the outdoor unit circuit, but does NOT present any problem for correct

operation of the unit.