Raypak B0507 Owner's Manual And Installation Instructions page 41

COMPONENT CHECKS & ADJUSTMENT PROCEDURES
4. Turn on water heater and allow main burner to light.
5. Adjust burner pressure to that indicated on the rating label. To increase burner gas pressure rotate the
adjusting screw clockwise or to decrease burner gas pressure rotate the adjusting screw anticlockwise.
6. Turn off water heater, refit adjustment screw cover, remove manometer and refit gas test point screw.
Modulating Models
Modulating type water heaters are fitted with a Siemens VGD series double block gas valve that has Siemens
SKP15 and SKP25 actuators (SKP25.703). The burner gas pressure for these models is set by adjusting the
SKP25 actuator for both the low and high rate as follows:
Low Gas Rate Adjustment
1. Turn off water heater.
2. Remove main burner gas test point screw and fit manometer to
gas test point.
3. Remove SQS37 modulating motor from SKP25 actuator by
unscrewing SQS37 locknut anticlockwise (refer to Diagram A)
4. Turn on water heater and allow main burner to light.
5. 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 clockwise to increase pressure or
anticlockwise to decrease pressure (refer to Diagram B).
High Gas Rate Adjustment
Press and hold 'ESC' on the RWF55 electronic thermostat for 5
6.
seconds to enter manual mode. „HAnd‟ appears on the lower
display, the current water temperature is shown on the upper
display.
7. Refit the SQS37 modulating motor to the SKP25 actuator (refer
to Diagram C) NOTE: The lock nut should be hand tight only, do
NOT use tools.
8. Drive the SQS37 modulating motor to the high fire position by
pressing the up (▲) button on the RWF55 electronic thermostat
until the motor cam stops turning (approximately 2 revolutions).
9. Remove dial indicator cover on the centre of the SQS37 modulating
motor so as the high fire adjustment screw can be accessed.
10. 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 modulating motor (refer to Diagram D).
11. Press and hold 'ESC' on the RWF55 electronic thermostat for 5
seconds to re-enter auto mode.
12. Turn off water heater, refit adjustment screw cover, remove
manometer and refit gas test point screw.
Diagram E
41
Diagram A
Diagram B
Diagram C
Diagram D