6.0 Servicing
34
Genie S
6.2 CHANGING COMPONENTS
Disconnect from power supply before
carrying out any electrical work
The following items can be replaced:
THE ELECTRICAL CHASSIS
To access these items fi rst remove the front top panel
and then the chassis cover.
Fuse
(See 6.4 for illustration)
There is an in-line
3A
fuse on the 24V supply between
the transformer and the pool thermostat. The fuse
holder bayonets pull apart to allow its replacement.
Transformer
(See 6.4 for illustration)
The transformer includes its own, internal thermal fuse
on the primary. If this has blown, establish the cause
before replacing the transformer.
•
Disconnect from the terminal strip and fuse holder.
•
Undo the two screws holding it to the chassis and
replace.
Pool thermostat
(See 6.4 for illustration)
•
Pull off the pool thermostat knob.
•
Release rear retainer by undoing the wing nut.
•
Pull off all the PCB connectors.
•
Slide out the thermostat.
•
Replacement is the reverse.
Condensate pressure switch
(See 6.4 for il-
lustration)
•
Undo the single fi xing screw.
•
Pull off the two electrical connectors and transfer
to the new switch. (connect to the ‘C’ and ‘NC’
connections.)
•
Replacement is the reverse
Relay
(See 6.4 for illustration)
•
Pull off the three electrical connectors and transfer
to the new relay.
•
Undo the two fi xing nuts and secure new relay in
position.
HEATER COMPONENTS
The remainder of the parts can be accessed through
the front of the heater.
Heat exchanger fl ow temperature sensor
This is located on the front connection to the heat
exchanger.
(See 6.4 for illustration)
•
Un-clip the sensor from the connection.
•
Transfer the push on electrical connectors to the
replacement and clip back on.
Heat exchanger pool sensor
Located in a pocket in the ‘From Pool’ side of the secondary
heat exchanger.
(See 6.4 for illustration)
•
Pull out the retaining wedge, and pull out the sensor.
•
Disconnect from the six way terminal strip on the
electrical chassis.
•
Replacement is the reverse.
Pool water pressure switch
Located on the Inlet connection to the secondary heat ex-
changer and its removal will require the draining or isolation
of the pool water in the heater.
(See 6.4 for illustration)
•
Pull off the electrical connectors
•
Unscrew from the secondary heat exchanger.
•
Replacement is the reverse.
•
Adjust switch
(see 4.3 for details).
Primary water pressure switch
Located on the primary fl ow pipe between the primary and
secondary heat exchangers.
(See 6.4 for illustration)
•
Drain primary system
•
Remove electrical connections
•
Unscrew pressure switch
•
Replacement is the reverse
Control thermostat
Located on the outlet connection of the heat exchanger.
(See 6.4 for illustration)
•
Un-clip the sensor from the connection.
•
Transfer the push on electrical connectors to the
replacement and clip back on.
Heat exchanger combustion temp sensor
Located on the top of the heat exchanger, on the right hand
side.
(See 6.4 for illustration)
•
Release the electrical connector by pressing the
latch and pulling up.
•
Twist the sensor a quarter turn clockwise and
withdraw
•
Replacement is the reverse.
Ensure the O ring seal is fi tted correctly to the
replacement before fi tting
Flue thermostat (manual reset)
This is located on the Flue Adapter.
(See 6.4 for illustration)
•
Pull off the electrical connectors.
•
Slide out from under the clip.
•
Replacement is the reverse.
Ignition control
(See 6.4 for illustration)
•
Undo the single screw holding the ignition control.
•
Release the two electrical connectors by pressing
the latch and pulling apart.
•
Pull the ignition control away from the gas valve.
•
Replacement is the reverse.
Summary of Contents for MB20S
Page 2: ...Condensing pool heater 2 Genie S Blank page ...
Page 32: ...5 0 Fault finding 32 Genie S Fig 11 0 5 4 SCHEMATIC WIRING ...
Page 39: ...Condensing pool heater 39 Genie S Blank page ...
Page 40: ...Station Lane Industrial Estate Witney Oxon Tel 01993 778855 Fax 01993 703407 June 2020 Rev J ...
