Commissioning - Potterton Envoy System 30 Installation & Service Instructions Manual

3. Commissioning - Page 14
All Systems
Note: The system can be filled using a sealed system
filler pump with a break tank or by any other method
approved by the Local Water Authority. Refer to
'THE SYSTEM' section Page 8 in these instructions,
also BS.6798 1987.
Flush out the system thoroughly with cold water. Fill and
vent the system until the pressure gauge registers 1.5
bar (21.5 lbf/in²). Examine for leaks. Raise the pressure
until the safety valve lifts. This should occur within ± 0.3
bar of the preset lift pressure of 3 bar. Release water to
attain the correct cold fill pressure.
The whole of the gas installation including the meter
should be inspected and tested for soundness and
purged in accordance with the recommendations of
BS.6891.
Electrical testwork should be carried out by a competent
person in accordance with the IEE Wiring Regulations.
Conduct a preliminary electrical test by checking: for
short circuits, fuse failure, incorrect polarity, earth
continuity and resistance to earth. If a fault has occurred
on the appliance, the fault finding procedure should be
followed. See Page 25.
Fit the functional case door into position by lifting it onto
the top hinge brackets and secure it with the lower two
fixing screws.
First Lighting
WARNING: Before lighting the boiler ensure that the
functional case door HAS BEEN CORRECTLY FITTED
and that the sealing strip fitted to the door is forming a
tight seal with the main boiler casing.
Before proceeding to light the boiler, check that the
external electricity supply to the boiler is switched off
and that the boiler control switch is in the mid i.e
position.
Turn on the gas service cock.
Ensure that the boiler and radiator isolating valves are
open.
Ensure the electronic timer if fitted, is in an 'ON' period
(refer to the time control literature).
Ensure that the room and/or cylinder thermostats where
fitted are set to a high temperature.
Switch ON the main electricity supply (character
be displayed).
Note: The boiler is protected by an automatic frost

14 Commissioning

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Protection device, therefore if the water temperature
within the boiler is below 5°C the character
displayed and the boiler will fire until a return
temperature of 10°C is reached. The boiler will then shut
down and the character
Switch the boiler control switch to the "H" position and
the character
10 seconds the boiler should light. Due to the presence
of air in the gas supply it is possible that the boiler will
not light at the first attempt but will automatically cycle
and make two further attempts. If the boiler still fails to
light it will go to lockout indicated by the character
shown flashing on the display. If this should occur wait
10 seconds then press the lockout reset button and the
boiler will go through another start sequence.
If the boiler fails to start after 1 or 2 attempts refer to
fault finding section.
It should be noted that the boiler control continually
monitors the temperature rise across the heat
exchanger. Therefore if the system is not correctly
vented, air passing through the pump may lead to boiler
shut down with the character
occurs, thoroughly vent the system and press the reset
button.
Burner Pressure
This appliance is fitted with a Gas/Air ratio control valve.
This gas valve ensures that the correct amount of gas is
delivered to the burner to match the available air supply
under all operating conditions.
THE BURNER PRESSURE AND GAS RATE HAVE
BEEN PRECISELY SET AND CHECKED DURING
MANUFACTURE AND NO ATTEMPT SHOULD BE
MADE TO ADJUST IT.
To check the correct operation of the gas valve follow
the instructions below carefully.
a. A good indication of correct operation of the boiler
will be obtained by measuring the gas rate at the
gas meter.
1. Run the appliance for at least 10 minutes.
2. With all other gas appliances turned off
measure the gas rate at the meter for a period
of at least 5 minutes. Check that the measured
rate is within ±5% of the rate stated on the data
plate.
will b. To measure the burner pressure.
1. Turn off the gas service cock. Fit a pressure
gauge to the gas inlet pressure test point on the
will be displayed.
will be displayed. After approximately
being displayed. If this
Publication No. 559787
will be