7 EN1R-9134 0503R20NE
ADJUSTMENTS
WARNING
Adjustments must be made by qualified persons only.
If the appliance manufacturer supplies checkout and/
or service and maintenance instructions carefully
follow them.
If such instructions are not provided then use the
procedure outlined below.
Adjustment can only be made with a special tool.
Pressure tap
The gas control is provided with a pressure tap of 9 mm O.D.
at inlet and outlet side.
When checking the pressure undo the screw a half turn and
slip tube over nipple.
Ensure that screw is retightened after making test.
CAUTION
To ensure a safe closing of the valves, it is essential
that voltage over the terminals of electric operators is
reduced to 0 Volt.
Offset adjustment (see fig. 1.)
• Remove cap screw with a Torx T-40 screw driver or 5 mm
hex key to expose offset adjustment screw.
• Check gas supply pressure to the appliance using a
pressure gauge connected to the inlet pressure tap.
• Start fan and check air flow.
• Energize both electric operators in order to have gas input
to burner and ignite boiler.
• Adjust CO
2
% at the desired value at low output with
offset adjustment screw. Turn offset adjustment screw
clockwise to increase CO
2
%.
• Operate boiler on high output. (Only modulating
applications).
• Replace cap screw and tighten pressure taps.
CHECKOUT
• After any adjustment check pressure taps and gas
connections with an approved leak detection fluid for gas
leakage.
• After any adjustment set appliance in operation and
observe a complete cycle to ensure that all burner
components function correctly.
MAINTENANCE AND SERVICE
Under normal circumstances no maintenance or service is
required.
WARNING
Do not disassemble the gas control; it contains no
replaceable components.
Attempted disassembly or repair may damage the
gas control
Screws on the valve that have been sealed must
never be removed.
To Next Page
Loading...
Need help?
General
