COMMISSIONING
46
GAS INLET PRESSURE
IMPORTANT – CHECK
the gas supply pressure at the inlet to the water heater
with the water heater and all other gas burning appliances in the premises
operating (burners alight). The minimum gas supply pressure is:
Natural Gas
1.13 kPa
Propane
2.75 kPa
Butane
2.75 kPa
If this minimum cannot be achieved, it may indicate the meter or the gas line to
the water heater is undersized. It is important to ensure that an adequate gas
supply pressure is available to the water heater when other gas burning
appliances, on the same gas supply, are operating.
BLEEDING THE SOLAR COLLECTORS
Upon completion of the installation, it is necessary to purge the air from the
collector circuit.
To purge air from the collector circuit:
•
Ensure the water heater is full of water and all of the hot taps are turned off.
•
Using a flat blade screwdriver,
open the bleed valve fitted
adjacent to the solar hot water
(from collector) inlet of the
solar storage tank (see
diagram).
•
The mains pressure will force
water to flow from the tank
and through the pipe work,
forcing air from the collector
circuit through the bleed
valve. This is evidenced by
spurting of water from the
drain line connected to the
bleed valve.
Warning:
Exercise care to
avoid any splashing of water,
as water discharged from the
solar collectors may be of a
very high temperature.
•
Close the bleed valve when water runs freely from the drain line.
