Set Appliance State:
Mains Power Off
CH Demand
Purge Switch in NORMAL position
HW Switch in OFF position
CH Switch in CH Continuous position
HW Potentiometer set to maximum
CH Potentiometer set to maximum
HW Switch in OFF position
CH Switch in CH Continuous position
HW Potentiometer set to maximum
CH Potentiometer set to maximum
Gas On
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Observation:
Allow the Boiler to operate with CH demand; the Burner should operate with a low burner pressure of approximately 1.8 mb.
After the Boiler has been operating at this low burner gas pressure for a time of 3 minutes since the Burner initially lit, put the HW Switch in its ON position and turn the HW tap fully on.
This demand should interrupt the CH operation and the boiler switch to its HW operating mode.
Maintain the HW demand for a few minutes.
After removing the HW demand, the Boiler should switch back to attend to the CH demand and operate in its CH low burner mode for a further 2 minutes, before increasing the burner pressure to meet the CH system demand.
Note:
The Boiler should have demonstrated that it will execute a full 5 minute low burner operation before increasing the burner gas pressure to meet the demand of the system and if interrupted during this 5 minute "anti-cycling" period will remember how much of the period it has completed and complete the time after the interruption is removed.
After the Boiler has been operating at this low burner gas pressure for a time of 3 minutes since the Burner initially lit, put the HW Switch in its ON position and turn the HW tap fully on.
This demand should interrupt the CH operation and the boiler switch to its HW operating mode.
Maintain the HW demand for a few minutes.
After removing the HW demand, the Boiler should switch back to attend to the CH demand and operate in its CH low burner mode for a further 2 minutes, before increasing the burner pressure to meet the CH system demand.
Note:
The Boiler should have demonstrated that it will execute a full 5 minute low burner operation before increasing the burner gas pressure to meet the demand of the system and if interrupted during this 5 minute "anti-cycling" period will remember how much of the period it has completed and complete the time after the interruption is removed.
Isolate as per TOPs P4
and refit as necessary