andrews R18 Series, Техническая документация инструкция

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18IP22B
54
Remove the pin connecting the modulating air damper to its
actuating arm at the modulating valve by releasing the clip.
Remove the pilot supply pipe by releasing the union nut at each
end. Unscrew the four screws that secure the modulating valve
to its flange connection on the gas manifold being careful not to
loose the "O" ring, and withdraw the gas train from its locating
slot in the burner trolley, the various controls in the main gas
train can now be replaced by unscrewing from the gas train.
The pilot solenoid valve can also be unscrewed at its outlet
connection and replaced.
An approved thread sealant should be used when re-connecti-
ng any pipe threads. Ensure that any controls replaced are
fitted squarely on the gas train, the "O" ring seal on the outlet of
the modulating valve is in good condition and correctly located
and the modulating valve drive shaft and linkages are correctly
assembled.
Upon replacement if components carry out the relevant portions
of section 6 commissioning.
Control panel components
Release the fixing screws from the cover of the electrical con-
nection tray.
Refer to fig. 25 for the locations of the various controls.
Replace components by removing electrical connections and
screw fixings.
Ignition generator
Release the two screws at each side of the cover lid. Discon-
nect the ignition transformer electrical connection from within
the electrical connection tray and release the ignition electrode
lead from the transformer. Replace the transformer by releasing
its screw fitting and reconnect the electrical connections ac-
cording the separate supplied wiring diagram.
The control thermostat RWF40 is fixed to the left or right hand
side of the electrical connection tray and its fixing screws can
be accessed via bottom of the electrical connection tray.
Re-connect any electrical connections in accordance with the
separate supplied wiring diagrams.
It is necessary to drain the water heater when replacing the
water flow switch as it incorporates water connections.
The temperature sensing phials for both the limit thermostat
and the high limit thermostat are contained within a thermostat
pocket in the flow header. The phials are released by first
removing the securing clip.