Set Appliance State:
Mains Power Off
CH Demand
DHW Selector in Minimum (-) position
CH Selector in Maximum (+) position
ON/OFF Switch in ON position
DHW Selector in Minimum (-) position
CH Selector in Maximum (+) position
ON/OFF Switch in ON position
Loosen the outlet test point screw (P2) and attach U-gauge to the test point.
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to fire and run.
After approximately 90 seconds, burner pressure should increase
to its set pressure.
Slowly turn the CH temperature selector anti-clockwise.
As the temperature demand is satisfied, does the burner pressure
reduce to its minimum setting?
Note: If CH burner pressure has been set at its minimum rate, then modulation will not take place.
When the U-gauge is removed, ensure the pressure test point is checked for soundness.
After approximately 90 seconds, burner pressure should increase
to its set pressure.
Slowly turn the CH temperature selector anti-clockwise.
As the temperature demand is satisfied, does the burner pressure
reduce to its minimum setting?
Note: If CH burner pressure has been set at its minimum rate, then modulation will not take place.
When the U-gauge is removed, ensure the pressure test point is checked for soundness.
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Isolate as per TOPs P4
and refit as necessary