Raypak 131 Service Instructions Manual page 42

Pressure Switch Adjustment
1. Remove the In/Out Header Access Cover. Refer to „In/Out Header Access Cover‟
procedure on page 44.
2. Check that all valves are correctly positioned to allow water flow through the heater.
3. Start system pump and ensure that the correct water flow rate is flowing through the
heater (minimum 1.3 l/sec maximum 6.9 l/sec).
4. Turn power on at the heater.
5. Adjust set point of the heater to 40ºC. If the heater lights proceed to step 6. If the
burner does not light proceed to step 7.
6. Turn the pressure switch knurled adjustment wheel slowly anti-clockwise until the
burner extinguishes then proceed to step 7.
7. Turn the pressure switch knurled adjustment wheel slowly
clockwise until the heater lights then turn the adjustment wheel
an additional ¼ turn.
8. Turn off the pump; the burner should now go out. If the burner
does not extinguish there is a fault with the pressure switch or
pool heater and fault finding will need to be performed to
locate the fault.
9. If the heater did go out in step 8; the pump should be cycled
on and off several times to ensure that the adjustment is
correct.
Flow Switch Adjustment
1. Check that all valves are correctly positioned to allow water flow through the heater.
2. Start system pump and ensure that the correct water flow rate is flowing through the
heater (minimum 1.3 l/sec maximum 6.9 l/sec).
3. Turn power on at the heater.
4. Adjust set point of the heater to 40ºC. If the burner lights proceed to step 6. If the
burner does not light proceed to step 7.
5. Turn the flow switch adjustment screw slowly anti-clockwise
until the burner extinguishes then proceed to step 7.
6. Turn the flow switch adjustment screw slowly clockwise until
the burner lights then turn the adjustment wheel an additional
¼ turn.
7. Turn off the pump; the burner should extinguish. If the burner
does not extinguish there is a fault with the flow switch or pool
heater and fault finding will need to be performed to locate the
fault.
8. If the burner did extinguish in step 8; the pump should be cycled on and off several
times to ensure that the adjustment is correct.
TM018 Raypak 131 Type A Pool & Spa Heaters REV: A
D.O.I: 8/04/2009
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42
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Pressure switch knurled
adjustment wheel
Flow switch
adjustment screw