86
3.
Top up with water until the charge pressure of the
cooled system is at least 1.0 bar (0.1 MPa), and is
0.1 to 0.2 bar (10 to 20 kPa) higher than the pre-
charge pressure of the expansion vessel.
Permiss. operating pressure: 3 bar (0.3 MPa)
Servicing safety valves and checking they are working
Servicing the thermally activated safety valve
Danger
Faulty thermal safety equipment can lead to
injury and material losses.
■
Check and clean the filter at the coolant inlet.
■
Do not loosen or tighten the nut on the red
operating button on the safety valve.
Fig. 68
1.
Activate the thermally activated safety valve: Push
red button
A
against the valve. Water must flow
from the valve.
2.
If the flow rate is low, clean the valve or replace if
required.
Cleaning flue system and checking it is working correctly
Danger
Leaking or blocked flue systems, or an insuffi-
cient combustion air supply can cause life
threatening poisoning from flue gas and carbon
monoxide.
■
Ensure the flue system is in good working
order.
■
Apertures for combustion air supply must be
non-closable.
The system may only be commissioned once the fol-
lowing conditions are guaranteed:
■
Unrestricted flow in the flue gas routes.
■
Flue pipes are routed so that all casing panels are
accessible and can be removed for maintenance.
■
The flue system is designed to be gas-tight.
■
Apertures for sufficient combustion air supply are
non-closable.
■
All current regulations on installing and commission-
ing flue systems have been observed.
Commissioning, inspection, maintenance
Checking the expansion vessel and system…
(cont.)
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