COMPLETING THE INSTALLATION
Make sure to check for gas leaks before completing the installation process
(connecting the assembly pipe and hose between indoor unit and outdoor unit,
insulating the cables, hose and pipe, and fixing the indoor unit to the installa
-
tion plate)
To check for gas leaks on the... Using a leak detector, check the...
Indoor unit Flare nuts at the end of sections
C and D.
Outdoor unit Valves on sections A and B.
Performing the Gas Leak Tests
C
D
A
B
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before recreating the vacuum and
recirculating the R410A, it’s responsible of installer to pressurize the whole system
with nitrogen (using a cylinder with pressure reducer) at a pressure above 30 bar
(gauge).
LEAK TEST WITH R410A (after opening valves)
Before opening valves, discharge all the nitrogen from the system and create
vacuum according to page 15.
After opening valves, check leaks using a leak detector for refrigerant
PUMP DOWN (before disconnecting the refrigerant connections for unit repair,
removal or disposal)
Pump-down is an operation intended to collect all the system refrigerant in the
outdoor unit.
This operation must be carried out before disconnecting the refrigerant tubing in
order to avoid refrigerant loss to the atmosphere.
- Shut off the liquid valve with the Allen wrench.
- Turn the system on in cooling with fan operating at high velocity.
(Compressor will immediately start, provided 3 minutes have elapsed since the
last stop).
- After 2 minutes of operation, shut the suction valve with the same wrench.
- Turn the system off and switch mains supply off.
- Disconnect tubing. After disconnection, protect valves and tubing ends from
dust.
- Compressor damage may occur if run at a negative suction pressure.
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