Rotex GasCompactUnit Series, Инструкция по установке и обслуживанию

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4.4 Replacing the boiler control panel
Warning: Electric shocks can
cause severe burns and life-
threatening injuries. Before
commencing any maintenance work,
isolate the heating system from the power
supply by switching the mains isolator
OFF, and safeguard against unintentional
reconnection (pull the power supply plug
from the plug-in PCB).
To change the boiler control panel, carry out
the following steps: (For the layout of the
individual components, see chapter 4)
1) Remove the locking screws of the silencer
hood (pos. 35 in Fig. 2.2.1), and lift off
the hood (pos. 34 in Fig. 2.2.1).
Caution: Danger risk of
scalding!
The capillary pipe of the
pressure gauge is in direct contact with
the pressurised heating water. Prior to
removing the pressure gauge, close the
ball valves on the boiler flow and return
and release the pressure via the boiler fill
& drain valve.
2) Close the shut-off valves (pos. 39 in
Fig. 2.2.1) in the heating flow and return,
connect a hose to the boiler fill & drain
valve (pos. 37 in Fig. 2.2.1) and release
the water pressure from the boiler.
3) Remove the capillary pipe from the
pressure gauge (Fig. 4.4.1). Remove the
small volume of water released when
undoing the pipe with a kitchen towel.
4) Undo the control panel cover (Fig. 4.4.2).
5) Pull all plugs from the PCB (Fig. 4.4.3).
All PCB plugs are coded to prevent errors
during reconnection.
6) Lift the sensor leads and connecting
cables from the from the cable ducts
with strain relief chicanes (Fig. 4.4.4)
7) Undo the control panel from the retainers
on the GSU/GCU lid (Fig. 4.4.5) and
replace the control panel.
8) Reinsert all sensor leads and connecting
cables in the cable duct with strain relief
and insert the plugs into the PCB sockets.
9) Refit the control panel cover.
10) Insert the pressure gauge capillary pipe.
11) Top up with water, until the required
system pressure has been reached again.
12) Open the shut-off valves on the heating
side and vent the system again.
13) Refit the silencer hood and secure
with the screws previously removed.
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Fig. 4.3.2: Removing the control unit
Fig. 4.4.1: Removing the pressure
gauge capillary pipe
Fig. 4.4.2: Removing the control panel cover