7 Installation
Installer reference guide
37
RRLQ004~008CA + RHBH/X04+08CB
ROTEX HPSU low temperature Bi‑bloc
4P384979-1 – 2015.01
INFORMATION
Depending on the units and/or the installation conditions, it
might be necessary to connect electrical wiring before you
can charge refrigerant.
Typical workflow – Charging additional refrigerant typically consists
of the following stages:
1 Determining if and how much you have to charge additionally.
2 If necessary, charging additional refrigerant.
3 Filling in the fluorinated greenhouse gases label, and fixing it to
the inside of the outdoor unit.
Completely recharging refrigerant
Before completely recharging refrigerant, make sure the following is
done:
1 The system is pumped down.
2 The outdoor unit's
external
refrigerant piping is checked (leak
test, vacuum drying).
3 Vacuum drying on the outdoor unit's
internal
refrigerant piping is
performed.
NOTICE
Before completely recharging, perform vacuum drying on
the outdoor unit's
internal
refrigerant piping as well.
Typical workflow – Completely recharging refrigerant typically
consists of the following stages:
1 Determining how much refrigerant to charge.
2 Charging refrigerant.
3 Filling in the fluorinated greenhouse gases label, and fixing it to
the inside of the outdoor unit.
7.7.2
Precautions when charging refrigerant
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
7.7.3
To determine the additional refrigerant
amount
If the total liquid
piping length is…
Then…
≤10 m
Do NOT add additional refrigerant.
>10 m
R=(total length (m) of liquid
piping–10 m)×0.020
R=Additional charge (kg)(rounded in units
of 0.1 kg)
INFORMATION
Piping length is the one way length of liquid piping.
7.7.4
To determine 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.
7.7.5
To charge refrigerant
WARNING
▪ Only use R410A as refrigerant. Other substances may
cause explosions and accidents.
▪ R410A contains fluorinated greenhouse gases. Its
global warming potential value is 2087.5. Do NOT vent
these gases into the atmosphere.
▪ When charging refrigerant, always use protective
gloves and safety glasses.
CAUTION
To avoid compressor breakdown, do NOT charge more
than the specified amount of refrigerant.
Prerequisite:
Before charging refrigerant, make sure the refrigerant
piping is connected and checked (leak test and vacuum drying).
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 relocating the
system, see
"13.2 To pump down" on page 81
7.7.6
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:
d
c
b
a
a
From the multilingual fluorinated greenhouse gases label
peal off the applicable language and stick it on top of
a
.
b
Factory refrigerant charge: see unit name plate
c
Additional refrigerant amount charged
d
Total refrigerant charge
2
Fix the label on the inside of the outdoor unit near the gas and
liquid stop valves.
7.8
Connecting the water piping
7.8.1
About connecting the water piping
Before connecting the water piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the water piping typically consists of the following
stages:
1
Connecting the water piping of the indoor unit.
2
Filling the water circuit.
3
Filling the domestic hot water tank.
4
Insulating the water piping.
