Installation manual
17
ERHQ011~W1 + ERLQ011~W1
Outdoor unit for air to water heat pump
4PW57794-1 – 08.2010
11. L
EAK
TEST
AND
VACUUM
DRYING
When all piping work is complete and the outdoor unit is connected to
the indoor unit, it is necessary to:
■
check for any leakages in the refrigerant piping
■
to perform vacuum drying to remove all moisture in the
refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, rainwater may have entered the piping), first
carry out the vacuum drying procedure below until all moisture has
been removed.
11.1. General guidelines
■
All piping inside the unit has been factory tested for leaks.
■
Use a 2-stage vacuum pump with a non-return valve which can
evacuate to a gauge pressure of –100.7 kPa (5 Torr absolute,
–755 mm Hg).
■
Connect the vacuum pump to
both
the service port of the gas
stop valve and the liquid stop valve to increase efficiency.
11.2. Setup
11.3. Leak test
The leak test must satisfy specification EN 378-2.
1
Vacuum leak test
1.1
Evacuate the system from the liquid and gas piping to
–100.7 kPa (5 Torr).
1.2
Once reached, turn off the vacuum pump and check that
the pressure does not rise for at least 1 minute.
1.3
Should the pressure rise, the system may either contain
moisture (see vacuum drying below) or have leaks.
2
Pressure leak test
2.1
Break the vacuum by pressurizing with nitrogen gas to a
minimum gauge pressure of 0.2 MPa (2 bar).
Never set the gauge pressure higher than the maximum
operation pressure of the unit, i.e. 4.0 MPa (40 bar).
2.2
Test for leaks by applying a bubble test solution to all piping
connections.
2.3
Discharge all nitrogen gas.
11.4. Vacuum drying
To remove all moisture from the system, proceed as follows:
1
Evacuate the system for at least 2 hours to a target vacuum of
–100.7 kPa.
2
Check that, with the vacuum pump turned off, the target vacuum
is maintained for at least 1 hour.
3
Should you fail to reach the target vacuum within 2 hours or
maintain the vacuum for 1 hour, the system may contain too
much moisture.
4
In that case, break the vacuum by pressurizing with nitrogen gas
to a gauge pressure of 0.05 MPa (0.5 bar) and repeat steps 1 to
3 until all moisture has been removed.
5
The stop valves can now be opened, and/or additional
refrigerant can be charged (see
12. C
HARGING
REFRIGERANT
12.1. Important information regarding the refrigerant
used
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type:
R410A
GWP
(1)
value:
1975
(1)
GWP = global warming potential
Please fill in with indelible ink,
■
➀
the factory refrigerant charge of the product,
■
➁
the additional refrigerant amount charged in the field and
■
➀
+
➁
the total refrigerant charge
on the fluorinated greenhouse gases label supplied with the product.
The filled out label must be adhered on the inside of the product and
in the proximity of the product charging port (e.g. on the inside of the
service cover).
NOTICE
■
Do not purge the air with refrigerants. Use a vacuum
pump to evacuate the installation. No additional
refrigerant is provided for air purging.
■
Make sure that the gas stop valve and liquid stop
valve are firmly closed before performing the leak test
or vacuum drying.
1
Pressure gauge
2
Nitrogen
3
Refrigerant
4
Weighing machine
5
Vacuum pump
6
Stop valve
NOTICE
Make sure to use a recommended bubble test
solution from your wholesaler.
Do not use soap water, which may cause
cracking of flare nuts (soap water may contain
salt, which absorbs moisture that will freeze when
the piping gets cold), and/or lead to corrosion of
flared joints (soap water may contain ammonia
which causes a corrosive effect between the
brass flare nut and the copper flare).
After opening the stop valve, it is possible that the pressure
in the refrigerant piping does not rise. 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.
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 multilingual fluorinated
greenhouse gases label is supplied with the unit.
Sticking instructions are illustrated on the backside of that
label.
3
5
6
2
1
4
1
Factory refrigerant
charge of the product:
see unit name plate
2
Additional refrigerant
amount charged in the
field
3
Total refrigerant charge
4
Contains fluorinated
greenhouse gases
covered by the Kyoto
Protocol
5
Outdoor unit
6
Refrigerant cylinder and
manifold for charging
