Set Appliance State:
Gas On; Pilot On
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Attach U-gauge to burner pressure test point
Selector switch in HOT WATER position
Attach U-gauge to burner pressure test point
Selector switch in HOT WATER position
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
With DHW tap fully open, the burner should ignite and
operate at its maximum gas pressure (approximately 15.3 mb).
Allow water to heat.
Does the burner pressure reduce as the water temperature demand is met?
Notes:
It may be necessary to reduce flow rate at the tap to assist temperature rise and modulation.
When U-gauge is removed, test point should be tightened and checked for gas soundness.
operate at its maximum gas pressure (approximately 15.3 mb).
Allow water to heat.
Does the burner pressure reduce as the water temperature demand is met?
Notes:
It may be necessary to reduce flow rate at the tap to assist temperature rise and modulation.
When U-gauge is removed, test point should be tightened and checked for gas soundness.
Isolate as per TOPs P4
and refit as necessary