d.
If necessary, from visual inspection, clean the heat exchanger using a suitable
stiff plastic bristle brush, vacuum out any large particles and flush the heat
exchanger with fresh water until the water flowing from the condensate drain is
clear.
e.
Remove the condensate trap (Section 8.8) and clean by flushing through with
clean running water.
f.
Check the electrode assembly mounted on the heat exchanger. If the point is
damaged or burnt replace it.
Check that the spark gap measures 3 mm.
g.
Replace the burner head, renewing the gasket, and reconnect the gas/air supply.
Ensure the flanged gas/air supply joint is air tight.
h.
Turn on the electrical supply to the boiler and allow the boiler to reach operating
temperature levels.
i.
Remove the combustion test point plug from the flue pipe. This is situated on the
flue spigot out of the cabinet.
j.
Carry the full procedure detailed in section 5.7 COMBUSTION TESTING -
MANDATORY
k.
Replace the combustion test point plug.
l.
Recheck the burner pressure by following the procedure detailed in Section 5.7.
m.
Check all joints for soundness up to the gas burner.
n.
Complete the Gas Boiler Commissioning Checklist - Service Interval Record
(Chapter 10).
WD500
Chapter 7 : Servicing
The Keston Q37 & Q37P Boilers
Installation & Servicing Instructions
Page : 43
