67
A
Fig. 29
Vapour tight control panel on the casing door
A
Vapour tightness test connector
1.
Remove the red plug from vapour tightness test
connector
A
.
2.
Insert the hose of the testing device into the test
connector.
3.
Tighten the test connector fitting. Ensure tightness.
4.
Generate negative pressure of 3 mbar (0.3 kPA)
using the hand pump of the testing device.
5.
Observe the pressure for the next 90 s.
After 90 s the negative pressure should still be
1.5 mbar (0.15 kPA).
Danger
Risk of explosion: Electrical components can
cause sparks which may be ignited by
escaping refrigerant.
If the negative pressure is
less
than
1.5 mbar (0.15 kPA) after 90 s, vapour tight-
ness of the control panel is
not
ensured:
■
Do not commission the heat pump.
■
Check the control panel gaskets. Replace
the gaskets if necessary. Repeat the test.
6.
Remove the hose of the testing device.
7.
Refit the red plug. Ensure tightness.
Opening the heat pump control unit
Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
■
Never touch
the wiring chambers (for heat
pump control unit and power supply connec-
tions).
■
When working on the appliance, isolate the
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check that
it is no longer live. Safeguard against recon-
nection.
■
Prior to working on the appliance, wait at
least 4 min until the voltage has completely
dropped out.
Maintenance
Checking the control panel for vapour tightness
(cont.)
5800 917 GB
Maintenance