page no. 57 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
2.7 Servicing
3. Remove the securing nut and remove thermostat from
the front panel.
4. Fit replacement thermostat in reverse order.
Note*: LX35 & 90 - 140 units have a second
limit stat at the opposing end of the heater to
the burner/controls. Remove the two small
cover plates and replace as above.
2.7.7.5. Air Pressure Switches
There are two Pressure Switches fitted to the heater, one
checks the low fire pressure and the other he high fire
pressure.
LOW FIRE PRESSURE SWITCH
HIGH FIRE PRESSURE SWITCH
1. Remove the two screws securing the cover and remove
cover..
2. Disconnect electrical connections.
3. Pull off the sensing tube from the air pressure switch.
4. Remove the screws fixing the air pressure switch and
remove switch.
5. Fit replacement in reverse order refitting the sensing
tube to the negative (- or L) tapping on the pressure
switch.
6. Adjust pressure switch set point to that shown in the
following table.
Model
Settings (Pa)
Low Fire
High Fire
LX15 -30 -60
LX20 -20 -60
LX25 -20 -50
LX30 -20 -50
LX35 -30 -100
LX40 -20 -60
LX50 -40 -110
LX60 -60 -160
LX70 -50 -150
LX90 -90 -250
LX120 -130 -350
LX140 -90 -350
2.7.7.6. Exhaust Fan
1. Remove the four screws securing the flue outlet socket.
2. Disconnect the fan electrical connections from the main
terminal strip.
3. Remove the screws securing the fan mounting box to
the exhaust header plate.
4. Remove fan assembly.
5. If needed, transfer the fan mounting box to the
replacement fan.
6. Fit replacement exhaust fan, using new gaskets and
silicon sealant as necessary, and reassemble in reverse
order.
2.7.7.7. Sequence Control Box
1. Unplug all the electrical connections.
2. Remove the two screws that secure the control box.
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