Calculating The Additional Refrigerant Charge; Method For Adding Refrigerant; Precautions When Adding R410A - Rotex RRRQ011AAV1 Installationsanleitung

NOTE National implementation of EU regulation on certain
fluorinated greenhouse gases may require to provide
the appropriate official national language on the unit.
Therefore, an additional
greenhouse gases label is supplied with the unit.
Sticking instructions are illustrated on the backside of
that label.

8.2. Calculating the additional refrigerant charge

Piping length is the one way length of gas or liquid piping
whichever is the longest.
It is not necessary to charge additionally if the piping length is under
10 m.
If the piping length is over 10 m please determine the additional
amount of refrigerant to be charged using the table below.
Table 1: Additional charging of refrigerant <unit: kg>
Refrigerant piping length
3~10 m 10~20 m 20~30 m
(a)
0.54 1.08
(a) Additional charge not required
Complete recharging
In case complete recharging is required (after a leak, etc.), refer to
the table below to determine the necessary amount of refrigerant.
Before recharging, make sure to execute vacuum drying of
the internal piping of the unit as well. To do so, use the
internal service port of the unit. Do NOT use the service
ports located on the stop valve (see "6.3. Guidelines for
handling stop valve" on page 8), since vacuum drying can
not be performed properly from these ports.
Outdoor units have 1 port on the piping. It is between the
heat exchanger and the 4-way valve.
Table 2: Total charging amount <unit: kg>
Refrigerant piping length
3~10 m 10~20 m 20~30 m
4.5 5.0 5.6
RRRQ011~016AAV1+Y1
Outdoor unit for air to water heat pump
4PW55782-1
multilingual fluorinated
30~40 m 40~50 m
1.62 2.16
30~40 m 40~50 m
6.1 6.7

8.3. Method for adding refrigerant

Precautions when adding R410A

Make sure to charge the refrigerant in liquid state to the liquid
pipe. Since R410A is a mixed refrigerant, its composition
changes if charged in its gaseous state and normal system
operation would then no longer be assured.
Before charging, check whether the refrigerant cylinder has a
syphon attached or not and position the cylinder accordingly.
Filling using a cylinder
with a siphon attached
Charge the liquid refrigerant
with the cylinder in upright
position.
How to connect the tank?
V1
4
5
1 2
6
3
1 Liquid line stop valve
2 Gas line stop valve
3 To indoor unit
4 Valve A
5 R410A tank
6 Measuring instrument
7 Pipe fixing plate
When the refrigerant tank is connected and the specified operation is
performed, the appropriate amount of refrigerant will be charged into
the system. The refrigerant must be charged according to the
procedure described below.
Charging while the outdoor unit is at a standstill
See the figure in "How to connect the tank?" on page 11.
1 Determine the weight of refrigerant to be charged additionally
referring to the item "Additional refrigerant charge" in
"Calculating the additional refrigerant charge" on page 11 and fill
in the amount in the "Additional refrigerant charge label"
attached to the unit.
2 After the vacuum drying is finished, open valve A and charge the
additional refrigerant in its liquid state through the service port
on the liquid stop valve taking into account following instructions:
- Turn on the power supply of the outdoor unit and indoor unit
(main circuit breaker on).
- Check that gas and liquid stop valves are closed.
- Stop the compressor and charge the specified weight of
refrigerant.
To avoid compressor breakdown. Do not charge the
refrigerant more than the specified amount.
Filling using a cylinder
without a siphon attached
Charge the liquid refrigerant
with the cylinder in up-side-
down position.
Y1
7
4
5
1 2
6
3
Installation manual
11