Certikin MB50S Service Manual download pdf (Page 29)

 Heat Exchanger Combustion Temperature Sensor.

 Flue Thermostat

 Ignition Control.

 Gas Valve.

 Fan.

 Pump.

 Heat Exchanger.

 Secondary Heat Exchanger.

On the Electrical Chassis

To access these items first remove the Front Top

Panel and then the Chassis Cover.

Fuse

(See Fig. 13.0)

There is one inline 3A fuse on the 24V supply be-

tween the Transformer and the Pool Thermostat. The

Fuse Holder bayonets apart to allow its replacement.

Transformer

(See Fig. 13.0)

The Transformer includes its own, internal thermal

fuse on the primary. If this has gone open circuit the

cause should be established 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 Fig. 13.0)

Pull off the Pool Thermostat Knob.

Release the 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 Fig. 13.0)

Undo the single fixing screw.

Pull off the two electrical connectors and transfer

to the new Switch. They connect to the ‘C’ and

‘NO’ connections.

 Replacement is the reverse

Relay

(See Fig. 13.0)

Pull off the three electrical connectors and

transfer to the new Relay.

Undo the two fixing nuts and secure new relay in

position.

Heater Components

The remainder of the parts can be accessed

through the front.

Heat Exchanger Flow Sensor

This is located on the front connection to the Heat

Exchanger. (See Fig.14.4)

Condensing Pool Heater

22/12/08

Unclip the sensor from the connection.

Transfer the push on electrical connectors to the

replacement and clip back on.

Heat Exchanger Pool Sensor

This is located in a pocket in the ‘From Pool’ side of

the Secondary Heat Exchanger. (See Fig.14.6)

Pull out the retaining slipper, and pull out sensor.

Diisconnect from the six way terminal strip on the

Electrical Chassis.

Replacement is the reverse.

Water Pressure Switch

This is located on the Inlet connection to the Second-

ary Heat Exchanger and its removal will require the

draining or isolation of the Pool water in the Heater.

(See Fig.14.6)

 Pull off the Electrical Connectors

 Unscrew from the Secondary Heat Exchanger.

 Replacement is the reverse.

If the Water Pressure Switch needs adjustment See

Page 12 for details.

Control Thermostat

This is located on the Outlet connection of the Heat

Exchanger. (See Fig.14.4)

Unclip the sensor from the connection.

Transfer the push on electrical connectors to the

replacement and clip back on.

Heat Exchanger Combustion

Temperature Sensor

This is located on the top of the Heat Exchanger, on

the right hand side. (See Fig.14.1)

 Release the electrical connector by pressing the

latch and pulling up.

Twist the Sensor a quarter turn clockwise and

withdraw.

IMPORTANT Ensure the O ring seal is fitted correctly

to the replacement before fitting.

 Replacement is the reverse.

Flue Thermostat (manual reset)

This is located on the Flue Adapter. (See Fig.14.1).

Pull off the electrical connectors.

Slide out from under the clip.

 Replacement is the reverse.

Ignition Control

(See Fig.14.3)

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.

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Certikin MB50S Service Manual Page 29

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