Certikin MB20S, Operating, Installation And Servicing Instructions

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4.0 Commissioning
25
Genie S
4.2 PRIOR TO BURNER OPERATION
The heater control is factory set to display in Fahr-
enheit and work to a maximum temperature of 90°F
(32°C). If a centigrade display or higher tempera-
ture 106°F (41°C) maximum is required, enter User
Setup Mode.
(See 4.6 for details)
The boiler is factory set for Natural Gas and fi tted
with automatic ignition and will start when the gas
cock is open, mains is connected and the pressure
switch is activated by the pool pump.
(for greater de-
tail about the internal controls see 5.1) LPG models
require to be modifi ed (See 4.4 for details).
4.3 POOL WATER PRESSURE SWITCH
The heater is protected by an adjustable pool water
pressure switch that has to close before the heater
will operate.
It has an adjustment range equivalent to
±
1.5 me-
tres. The switch is factory set for most conditions but
can be altered if required:
1. Start the testing with the power switch on the
front of the heater in the OFF position.
2. Turn the pool pump ON, and rotate the knurled
nut clockwise until a click is heard.
3. Turn the nut anti-clockwise a quarter of a turn.
4. Turn the pump ON and OFF to check the switch
operates correctly.
5. Turn the heater ON and set the temperature
maximum to check that the burner is turned ON
when the pool pump is turned ON and OFF
when the pool pump is turned OFF
It is very important to verify that it
turns off when the water fl ow is inter-
rupted.
4.4 CONVERSION TO LPG
The heater can be converted on site. Natural Gas to
Propane, or Propane to Butane.
Follow these steps to convert to LPG:
Fig. 5.0
1. With the gas and electrical supply off , undo the
three screws that hold the venturi to the gas valve.
2. Allow the gas valve to drop away from the venturi.
3. Fit the conversion orifi ce into the rubber seal that
sits in the gas valve.
4. Re-assemble the gas valve and venturi.
5. Affi x the new LPG serial number data label sup-
plied over the existing.
6. Turn gas on and check for leaks.
7. If converting an MB50S initially turn the throttle
adjustment screw four turns anti-clockwise
8. Proceed to follow the guidance in 4.5 and if neces-
sary turn the throttle screw anti-clockwise another
turn until ignition is achieved.
LPG to NG Conversion
The method is as detailed above except the steps are
reversed (if converting an MB50S remember to initially
turn the throttle screw fi ve turns clockwise before oper-
ating the heater).
The orifi ce is removed and the venturi and gas valve
reassembled with just the rubber seal between them. A
new serial number data plate should be obtained from
the manufacturer and affi xed over the existing.
Orifi ce in position
Throttle
Adjustment