SECTION 12: COMMISSIONING
27 of 46
Figure 12: Gas Valve for Heater (Models 75 - 115)
12.4.2 Commissioning t
he Gas Valves (all gases)
12.4.2.1 Check Burner Gas Pressure
1. Loosen the screw cove
r of the outlet (burner)
pressure test point and connect a manometer.
2. With the bur
ner firing, measure the pressure on
the manometer. To adjust the burner pressure,
remove the regulator cover from the valve and
turn the regulator adjustment screw to set the
required burner pressure as stated in the Tech-
nical Data Tables for the correct gas and model
on Page 11, Section 5.4.
NOTE: If
the correct burner pressure cannot be
reached, then check the inlet pressure to the valve,
with the burner firing. See Technical Data Tables on
Page 11, Section 5.4 for inlet pressure
requirement.
Do not continue to adjust the regul
ator if the
pressure is not changing.
If the inlet pressur
e is too low to allow correct burner
pressure setting, then the gas inlet pressure must be
corrected before completing the commission.
Check Gas Rate
1. Af te r b ur
ner pressure adjustment, allow the
heater to operate for at least 15 minutes and
then re-check settings.
2. Remove t
he manometer and refit all covers to
the valve and tighten the screw of the outlet
pressure tap.
3. Check gas flow r
ate at gas meter.
12.5 Combustion Testing
The only adjustment to alter combustion
performance is burner pressure. Combustion quality
must be tested to prove correct heater operation.
Incorrect results will indicate faults with the
installation or appliance.
Combus
tion testing must be carried out with all
covers in place. The flue gas is sampled in the flue,
within 1 meter of the heater. The values of CO
2
should be between 6.5% to 8.0% for natural gas and
7.0% to 9.1% for LPG dependant upon model.
The CO will b
e up to 80 ppm (0.008%) dry, air free
dependant upon model. Temperature rise of the flue
gases above ambient should be approximately
160° C to 180° C. Seal test hole in flue af
ter testing.
Pressure Swi
tch:The pressure switch is factory pre-
set for each model and is not adjustable.
12.6 Turning O
ff the Heater
Set the external controls to the off position and the
ma
in burner will stop.
The fans will run unt
il they are stopped automatically
by the fan thermostat.
Do not use electrical isolator for control of
h
eater. Electrical isolator will switch off the fan.
Heat exchanger could be damaged. Warranty will
not cover damage to the heat exchanger if
operated improperly.
Regulator
(Under Cover)
Inlet Pressure
Gas Outlet
Outlet Pressure
Plug for
Main Gas Valve
Gas Inlet
Plug for
Main Safety
Gas Valve
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