Ambirad VPlus100, Owner'S Manual, Page: 10 / 36

Inspect installation and ensure that it has
been carried out in accordance with the in-
structions. Inspect the burner and electrode
assemblies insuring these are securely fixed
and all electrical connections securely
made.
Fit the burner ensuring that it is correctly
positioned and the screws are fully tight-
ened. 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 isolating gas valve and test gas con-
nections for soundness using soap solution.
Open the control housing door by unscrew-
ing the securing screw.
Ensure all internal components are securely
fixed and all connections securely made.
Open the manual gas valve outside the con-
trol housing
Switch on the electrical supply to start the
heater and observe the correct start up se-
quence. Ensure that the setting of any time
switch and thermostat are such that the heat-
ing 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 pres-
sure condition has been established, the ig-
nition sequence will commence. The spark
ignition will be energised producing a spark
at the ignition electrode. The gas solenoid
valve will at the same time be energised 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-energised
after approximately 10 seconds. For ap-
proximately 10 to 20 seconds the fan will
purge the system then re-ignition will be
attempted. After 2 further attempts at igni-
tion 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 inves-
tigate 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 com-
bination gas control valve. Remove the
cover from the pressure regulator revealing
the adjustable screw. Start the heater and
using a suitable screwdriver adjust the pres-
sure 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. Switch off the
power supply to the heating system. Discon-
nect ‘U’ tube manometer, then securely re-
place screw in pressure test nipple.
Check the operation of the flame safeguard
equipment as follows:
With the heater running normally, switch off
the gas supply at the shut off valve. The
heater should attempt to relight and if the
gas valve has been left off ‘lock-out’ should
occur indicated by the ‘power on’ lamp be-
ing illuminated and fan running, but the
‘burner on’ lamp being off.
Check the operation of the pressure proving
switch as follows:
With the heater running normally, pull off
the silicone rubber tube connecting the vac-
uum switch to the combustion chamber.
Within 4 seconds the burner should shut off.
Then replace the tube securely and observe
that the heater proceeds to ignite in the nor-
mal way.
Close the controls door securing it with the
screw.
10. INSTALLATION CHECK OUT
AND START UP.