Page No 22 of 52 Reznor, Photon, Installation Manual, EN 2021-04, D301310 Iss 0
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8. The gas pressure must correspond to the
data in table 3. If the gas pressure is higher
than 50mbar, a pressure regulator must be
installed. If the gas pressure is lower than the
minimum as shown on the data plate, check
the supply pipework to ensure it is correctly
sized. Gas pressure should be checked with
the appliance running at maximum heat
load.
When overheating occurs, shut the manual gas
tap before turning off the electric power.
Air / gas ratio controls
PHOTON appliances are fitted with air-gas ratio
control devices with two adjustments - throttle
and offset.
Throttle is adjusted at high fire.
Offset is adjusted at low fire.
Gas valve adjustment
All units are set before leaving the factory. Any
modification must be carried out by a suitably
qualified technician.
Models 10-70
To adjust the throttle use a 4mm hex key on the
screw located on the venturi. Rotate counter
clockwise to increase %CO2. Rotate clockwise
to decrease %CO2.
To adjust the offset, use a T40 Torx key to
remove the protection cap on the gas valve.
Rotate counter clockwise to decrease pressure /
%CO2 and rotate clockwise to increase pressure
/ %CO2. Refit cap after adjustment.
1 - Offset adjustment
2 - Inlet pressure measuring point
3 - CO2 adjustment point (throttle)
4 - Offset pressure measuring point
Figure 6 Gas valve adjustment models 10-70
Model 100
To adjust the throttle use a 4mm hex key on the
screw located on the venturi. Rotate clockwise
to increase %CO2. Rotate counter clockwise to
decrease %CO2.
To adjust the offset, use a T40 torx key to
remove the protection cap on the gas valve.
Rotate counter clockwise to decrease pressure /
%CO2 and rotate clockwise to increase pressure
/ %CO2. Refit cap after adjustment.
1 - Offset adjustment
2 - Inlet pressure measuring point
3 - CO2 adjustment point (throttle)
4 - Offset pressure measuring point
Figure 7 Gas valve adjustment model 100
1
2
3
4
