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BURNER GAS PRESSURE ADJUSTMENT
On/Off Models
The burner pressure is set by adjusting the Jeavons J48 appliance regulator.
To adjust the burner pressure:
1. Fit manometer to main burner test point
2. Turn on electrical power to heater
3. Allow main burner to light
Modulating Models
Low Gas Rate Adjustment
1. Fit manometer to main burner test point.
2. Remove the SQS37 motor drive from SKP25 actuator.
3. Light the water heater. Refer to the 'Lighting Procedure'
on page 28.
4
Adjust the low fire gas pressure to 0.3kPa (Natural Gas
Models) or 1.3kPa (propane models) by turning the
outer regulator screw on the SKP25 actuator (Refer to
diagram opposite)
High Gas Rate Adjustment
8
Adjust the high gas pressure to 0.92kPa (natural gas
models) or 2.75kPa (propane models) by turning the small
screw through the centre of the SQS37 drive motor (refer to
figure opposite)
9
Press the "EXIT" button for 5 seconds to re-enter the auto
mode. The red LED adjacent to the hand symbol will
extinguish.
ADJUSTMENT
4. Remove adjustment screw cover (refer to diagram opposite)
5. To increase the burner pressure rotate the adjusting screw
clockwise, to decrease the burner pressure rotate the adjusting
screw anti-clockwise.
6. Adjust burner pressure to that indicated on the rating label.
7. Extinguish burner, refit adjustment screw cover, remove manometer
and refit test point screw.
5
Press the "EXIT" button on the RWF40 controller for 5 seconds
to enter the manual mode. The red LED adjacent to the hand
symbol will illuminate.
6
Refit the SQS37 drive motor to the SKP25 actuator (Refer to
figure opposite) NOTE: The lock nut should be hand tight only
do NOT use tools
7
Drive the SQS37 motor to the high fire position by pressing the
up (▲) button until the motor cam stops turning (approximately
2 revolutions)
33
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