andrews R18 Series, Техническая документация инструкция

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18IP22B
46
Fault Possible cause Solution
Air modulating damper HT lead disconnected or Correct
cycles, no ignition spark faulty
and water heater then
goes to lockout, indicator
Ignition electrode incor- Check setting or replace
(2) alights rectly set or faulty
Faulty ignition generator Change
Faulty control box Change box
Ignition sparks, pilot Gas supply turned off Turn on
burner does not light and
water heater then goes
Pilot manual cock turned Turn on
to lock-out indicator (2) off
alights
Air in gas line Purge air
Faulty pilot safety shut Rectify
off valve or Connections
Pilot injector blocked Clean
Pilot governor set too low Adjust
Pilot burner ignites but Check flame probe If damaged, replace
water heater then goes
to lock-out, indicator (2)
Flame probe lead(s) not Rectify
alights. Main burners do connected or faulty
not light
Faulty connections to Rectify
main safety shut off val-
ve(s)
Faulty main safety shut Change valves
off valves
Faulty control box Replace
Check ionisation current,
as per instructions
Water heater operates Fault in water system Rectify
but then goes to over-
heat indicator (4) alights
Main burner pressure set Reset
too high
Pump overrun inopera- Rectify
tive
Water heater does not Min. fire is set below
shut down minimum setting, reset
servomotor.