Section – Flushing with OFDN and provision of Holding Charge
Steps recommended
No
Where Activities
1
Carry out all intended works without hurry and
THINK BEFORE ACTING!
2
AC system “OFF” (unplugged) and emptied from HC refrigerant.
3
Arrange your tools and equipment connections as indicated on page
83. The pressure adjusting handle (screw) of the pressure regulator
is back-seated. The cylinder valve and the pressure regulators outlet-
valve to the OFDN transfer hose (N) is closed!
4
N, L
Assure that the nitrogen transfer hose with the connection at the suc-
tion line service port “L” consists of a core depressor to open the ser-
vice port inner core valve during connection.
5
N, L
Connect the OFDN cylinder with transfer hose N to the service port of
the outdoor units low-side stop valve L
6
H, L
Open the outdoor units low-side and high-side stop valves.
7
Open the OFDN cylinder valve
8
Adjust the pressure regulators pressure adjusting handle (screw) to
about 10 bar shown at the delivery pressure gauge
9
Open slowly the pressure regulators outlet-valve
10
OFDN now is transferred into the complete AC system. Continue the
transfer of Nitrogen until there is no further flow audible (pressure
equalisation) and 10 bar is indicated.
11
Close the pressure regulators outlet-valve
12
N, L
Remove the OFDN transfer hose from the service port
13
Carefully open the service ports Schrader valve using a valve “pin”
depressor (e.g. small screw-driver) and blow-out the Nitrogen charge.
If necessary hold a piece of old cloth (or paper) into the flow stream
to keep eventually escaping oil from the system. Ensure ventilation of
the work space during gas venting. Do not inhale the escaping gas.
14
If there is no further flow of gas audible or sensible, the process of
system flushing is finished.
15
To add an OFDN Holding Charge to the system start again with step
No. 5 to No. 12 and end with No. 16 and No. 17 of this course of
activities. A charged amount of about 5 bar is sufficient.
17
Close the OFDN cylinder valve. Return the pressure regulators adjust-
ing handle (screw) in its back-seated position. Purge the pressure
regulator from the outlet-valve (pressure regulator is now discharged).
16
H, L
Close the outdoor units low-side and high-side stop valves (front-
seated position)
Flushing the system and provision of a “Holding Charge” with
OFDN — Course of activities sequences
N
Interconnection
of the Manifold
Gauge Set should
only be consid-
ered for refriger-
ant handling or
low-pressure
OFDN use.
High pressure
OFDN use will
cause early me-
chanical wear of
the gauge set and
manifolds sup-
plied with sight
glass can cause
violation by acci-
dentally pressing
out the glass
from the body!
To provide a
“Holding
Charge” to the
system is
in case of no
further actions
to the system
for the time
being.
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