To Perform Vacuum Drying; To Determine The Additional Refrigerant Amount; To Calculate The Complete Recharge Amount; To Charge Refrigerant - Daikin Altherma Installer's Reference Manual

7 Installation
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.
7.4.12

To perform vacuum drying

Connect the vacuum pump and manifold as follows:
a d h
b
c
j
e
f
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...
Does not change
Increases
3 Evacuate for at least 2 hours to a pressure on the manifold of
−0.1 MPa (−1 bar).
4 After turning OFF the pump, 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.
7.4.13 To determine the additional refrigerant
amount
If the total liquid piping length
is...
≤10 m
>10 m
Installer reference guide
34
Then...
There is no moisture in the
system. This procedure is
finished.
There is moisture in the
system. Go to the next step.
Then...
Do NOT add additional
refrigerant.
Add 20 g refrigerant per extra
meter (above 10 m).
7.4.14 To calculate the complete recharge
amount
INFORMATION
If a complete recharge is necessary, the total refrigerant
charge is: the factory refrigerant charge (see unit name
plate) + the determined additional amount.
7.4.15

To charge refrigerant

WARNING
▪ Only use R410A as refrigerant. Other substances may
cause explosions and accidents.
▪ R410A contains fluorinated greenhouse gases covered
by the Kyoto Protocol. Its global warming potential
value is 1975. Do NOT vent these gases into the
atmosphere.
▪ When charging refrigerant, always use protective
gloves and safety glasses.
CAUTION
Do NOT charge the refrigerant more than the specified
amount, to avoid compressor breakdown.
Other guidelines:
▪ Only use tools exclusively for R410A to ensure pressure
resistance and to prevent foreign materials from entering into the
system.
▪ Check whether the refrigerant cylinder is equipped with a siphon
tube (the marking "liquid filling siphon attached" should be
present).
Charge the liquid
refrigerant with the
cylinder in upright
position.
▪ Open refrigerant cylinders slowly.
▪ Charge the refrigerant in liquid form. Adding it in gas form may
prevent normal operation.
1 Connect the refrigerant cylinder to the service port.
2 Charge the additional refrigerant amount.
3 Open the gas stop valve.
If pump down is needed in case of dismantling or relocate the
system, see "13.1 To pump down" on page 74 for more details.
7.4.16 To fix the fluorinated greenhouse gases
label
NOTICE
National implementation of EU regulation on certain
fluorinated greenhouse gases may require to provide the
appropriate official language on the unit. Therefore, an
additional multilingual fluorinated greenhouse gases label
is supplied with the unit.
1 Fill in the label as follows:
Charge the liquid
refrigerant with the cylinder
in up-side-down position.
a
b
c
d
ERLQ004~008CAV3 + EHBH/X04+08CA
Daikin Altherma - Low Temperature Split
4P313774-1C – 2012.11