Potterton Envoy Flowsure, Installation & Service Instructions Manual

Page: 16 / 39

Commissioning
Publication No. 559779
16
3. Commissioning – Page 16
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 9 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 30.
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 CH & DHW control switches are in the 'Off'
position.
Turn on the gas service cock.
Ensure that the boiler and radiator isolating valves are
open.
Switch ON the main electricity supply (character will be
displayed).
Note : The boiler is protected by an automatic frost
protection device, therefore if the water temperature
within the boiler is below 5°C or 10°C in the tank the
boiler will fire until the return temperature reaches 40°C
or the tank temperature reaches 15°C.
Ensure the electronic timer if fitted, is in an 'ON' period
(refer to the time control literature).
Ensure that the room thermostat if fitted is set to a high
temperature.
Switch both the CH & DHW switches to the On position.
The symbol in the Status/Function display will change
from to or .
The fan switches on and sets to maximum RPM to give
a pre-purge.
The hot surface igniter turns on and reaches a preset
temperature.
The gas valve is opened.
If the control fails to detect flame in the first 3 seconds,
the boiler will stop and a new ignition cycle started.
After 3 ignition attempts the control will go to lockout.
The Status/Function display will show an
and the Flow Temperature & settings display will show
. Refer to fault finding section on Page 30.
If ignition is successful the flow temperature is
measured by the control for the first twenty seconds to
ensure that there is a greater than 3°C rise in the flow
temperature. (If unsuccessful, the boiler will go to
lockout - see fault finding).
When the temperature rise has been detected, the
controls will adjust the boiler output depending on
whether the call for heat is from the domestic hot water
or central heating. When the set temperature is reached
the controls will close the gas valve, allow the fan to run
for a short time then set the pump overrun (if required).
It should be noted that the boiler control continuously
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 characters being displayed in
the Flow Temperature & Settings display and the
character
shown in the Status/Function. If this 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.