7
Installation
Installer reference guide
31
ERLQ004~008CA + 08S18CA3VF
Daikin Altherma low temperature split
4P3662261 – 2014.01
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.
7.4.9
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.
7.4.10
About checking the refrigerant piping
Checking the refrigerant piping typically consists of:
1
Checking for leaks.
2
Performing vacuum drying.
NOTICE
Use a 2stage vacuum pump with a nonreturn valve that
can evacuate to a gauge pressure of − 100.7 kPa (5 Torr
absolute).
NOTICE
Use this vacuum pump for R410A exclusively. Using the
same pump for other refrigerants may damage the pump
and the unit.
NOTICE
▪ Connect the vacuum pump to the service port of the
gas stop valve.
▪ Make sure that the gas stop valve and liquid stop valve
are firmly closed before performing the leak test or
vacuum drying.
Keep in mind the following guidelines:
▪ The piping inside the unit has been factory tested for leaks.
▪ If using additional refrigerant, perform air purging from the
refrigerant pipes and indoor unit using a vacuum pump. Then
charge additional refrigerant.
7.4.11
To check for leaks
NOTICE
▪ Do NOT exceed the maximum operation pressure of
4000 kPa (40 bar).
▪ Only use recommended bubble test solution.
1
Charge the system with nitrogen gas up to a gauge pressure of
at least 200 kPa (2 bar). It is recommended to pressurize to
3000 kPa (30 bar) in order to detect small leaks.
2
Check for leaks by applying the bubble test solution to all
connections.
3
Discharge all nitrogen gas.
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
j
b
f
e
c
g h i
h
a
Pressure meter
b
Gauge manifold
c
Lowpressure valve (Lo)
d
Highpressure 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 45 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.
Summary of Contents for ERLQ004CAV3
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