Reznor VPT Unit Installation Manual - Manual (Page 26)

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3. Start Up Instructions.
These appliances should be commissioned by a qualified mechanical contractor.
3.1 Tools Required.
The following tools and equipment are advisable
to complete the tasks laid out in this manual. Suitable alternative tools may be used.
Small Flat
Head
Screwdriver
Manometer
Phillips
Screwdriver Leather
Faced
Gloves
5/32” (4mm)
Allen
Wrench
½”
Wrench
Large Adjustable
Wrenches for fitting
Of Gas Flex.
3.2 Start Up procedure
Inspect installation and ensure that it has been
carried out in accordance with these
instructions. Remove burner and inspect the
electrode assemblies ensuring these are
securely fixed and all electrical connections
securely made.
Re-fit the burner ensuring that it is correctly
positioned and the screws are fully tightened.
Ensure that electrical and gas supplies are
isolated.
The gas supply should be purged and tested for
soundness in accordance with local and
National Safety codes.
Open manual gas valve and test gas
connections for soundness using soap solution.
Open the control housing door by unscrewing
the securing screw. Ensure all internal
components are securely fixed and all
connections securely made.
Open the manual gas valve outside the control
housing
Switch on the electrical supply to start the
heater and observe the correct start up
sequence. Ensure that the setting of any time
switch and thermostat are such that the heating
system will be required to operate.
The fan will start to run and the ‘power on’ lamp
will illuminate. Safe-start checks are carried out
automatically.
After the fan has run up to full speed and a
satisfactory pressure condition has been
established, the ignition sequence will
commence. The spark ignition will be energized
producing a spark at the ignition electrode. The
gas solenoid valve will at the same time be
energized and the ‘burner on’ lamp will
illuminate. If the ignition is successful, the flame
is detected by the flame sensing probe and the
‘burner on’ lamp will remain on.
If ignition is unsuccessful the gas valve will close
and the spark ignition de-energized after
approximately 15 seconds. For approximately
30 seconds the fan will purge the system then
re-ignition will be attempted. After 2 further
attempts at ignition the control unit will ‘lock-out’,
the ‘power on’ lamp will remain illuminated and
the fan will continue to run.
To reset after ‘lockout’ switch off the power
supply to the system and wait 2 minutes. Then
turn the power on. If repeated ‘lockout’ occurs,
investigate the cause.
Set burner gas pressure as follows:
Switch off the power supply to the heating
system.
Connect a ‘U’ tube manometer to the pressure
test point provided on the combination gas
control valve.
Remove the cover from the pressure regulator
revealing the adjustable screw.
Start the heater and using a suitable screwdriver
adjust the pressure regulator, turning the screw
clockwise to increase the pressure or
counter-clockwise to decrease the pressure.
Set the pressure to appropriate inches w.c. from
the table of gas pressures and orifice plate
dimensions for correct heater description.
Multimeter