7 Installation
Installer reference guide
35
RRLQ004~008CA + RHBH/X04+08CB
ROTEX HPSU low temperature Bi‑bloc
4P384979-1 – 2015.01
To open/close the stop valve
1
Remove the valve cover.
2
Insert a hexagon wrench (liquid side: 4 mm, gas side: 6 mm)
into the valve stem and turn the valve stem:
Counterclockwise to open.
Clockwise to close.
3
When the valve stem cannot be turned any further, stop turning.
The valve is now opened/closed.
To handle the stem cap
Take the following guidelines into account:
▪ The stem cap is sealed where indicated with the arrow. Do NOT
damage it.
▪ After handling the stop valve, make sure to tighten the stem cap
securely.
▪ For the tightening torque, refer to the following table.
▪ Check for refrigerant leaks after tightening the stem cap.
Item
Tightening torque (N∙m)
Stem cap, liquid side
13.5~16.5
Stem cap, gas side
22.5~27.5
Service port cap
11.5~13.9
To handle the service cap
Take the following guidelines into account:
▪ Always use a charge hose equipped with a valve depressor pin,
since the service port is a Schrader type valve.
▪ After handling the service port, tighten the service port cap
securely. For the tightening torque, refer to the table in chapter
"To handle the stem cap" on page 35
▪ Check for refrigerant leaks after tightening the service port cap.
7.5.8
To connect the refrigerant piping to the
outdoor unit
1
Connect the liquid refrigerant connection from the indoor unit to
the liquid stop valve of the outdoor unit.
a
b
c
a
Liquid stop valve
b
Gas stop valve
c
Service port
2
Connect the gas refrigerant connection from the indoor unit to
the refrigerant stop valve of the outdoor unit.
7.5.9
To connect the refrigerant piping to the
indoor unit
1
Connect the liquid stop valve from the outdoor unit to the
refrigerant liquid connection of the indoor unit.
a
b
a
Refrigerant liquid connection
b
Refrigerant gas connection
2
Connect the gas stop valve from the outdoor unit to the
refrigerant gas connection of the indoor unit.
NOTICE
It is recommended that the refrigerant piping between
indoor and outdoor unit is installed in a ducting or the
refrigerant piping is wrapped with finishing tape.
7.6
Checking the refrigerant piping
7.6.1
About checking the refrigerant piping
The outdoor unit's
internal
refrigerant piping has been factory tested
for leaks. You only have to check the outdoor unit's
external
refrigerant piping.
Before checking the refrigerant piping
Make sure the refrigerant piping is connected between the outdoor
unit and the indoor unit.
Typical workflow
Checking the refrigerant piping typically consists of the following
stages:
1
Checking for leaks in the refrigerant piping.
2
Performing vacuum drying to remove all moisture, air or
nitrogen from the refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, water may have entered the piping), first carry
out the vacuum drying procedure below until all moisture has been
removed.
