VOKERA Linea Installation & Servicing Instructions Manual - page 36
Supplied By www.heating spares.co Tel. 0161 620 6677
Linea Max
32
9.2.3
Central Heating Mode
In this mode the mode selector switch must
be turned to the position.
With all controls calling for heat the motor-
ised valve returns, mechanically diverting
primary water to the central heating circuit.
The pump will run and provided sufficient
primary water is circulating the flow switch
is activated.
The fan will run and the pressure differential
switch will be activated. This in turn will
energise the electronic ignition control box.
The gas valve will be energised and the
electrode will start to spark.
If a flame is detected during the ignition
attempt period, (8-12 seconds) the sparking
will cease and the gas valve will remain
energised.
The temperature rise of the primary water is
sensed by the thermistor on the flow pipe.
As the temperature of the primary water
approaches that set on the c/h temperature
control, the voltage to the modulator coil will
decrease and thus lower the gas rate.
On reaching the set temperature the gas
valve is de-energised and the burner is
extinguished.
The appliance has an inbuilt delay timer and
re-ignition will not be attempted for approxi-
mately 3 minutes. This can be deactivated.
See page 53.
Conversely a fall in temperature of the
primary water will increase the voltage to
the modulator coil therefore increase the
gas rate.Constant monitoring of the tem-
perature of the primary water by the ther-
mistor will regulate the gas rate to maintain
an average heat input.
When the appliance has reached the set
temperature and the burner is off, the pump
will continue to run to circulate the primary
water around the c/h system.
Temperature of the central heating is
shown at the temperature indicator when-
ever the central heating is on.
FAULT FINDING GUIDES
On the following pages are the fault finding guides. Be sure to read the notes below before
begining any fault finding
NOTES:
1.
To ensure correct fault diagnosis it is important that these guides are carried out in the set order.
2.
Check the electrical supply polarity is correct before carrying out fault finding (lockout will occur if the
polarity is reversed).
3.
To ensure that internal/external controls (if fitted) do not interfere with fault finding, disconnect the wires
from terminals 2 & 3 (labelling them in the process to ensure correct reconnection) and provide a solid
link between 2 & 3.
If supply to the appliance is broken (e.g. by
a room thermostat or timeclock) the burner
is extinguished the pump stops, the motor-
ised valve is energised into the hot water
mode waiting for pre-heat or demand for hot
water. However, the fan will continue to run
until the primary water temperature is below
80°C.
Should there be a restriction in the heating
circuit reducing the flow rate to below 350 l/
hour (1.28 gpm) the flow switch could
deactivate and de-energise the gas valve.
Self Diagnostic Error Codes
The temperature indicator also serves as an
error code indicator. Should an error occur
the status LED (which is normally green)
will flash red. This will be accompanied by
the temperature indicator flashing an error
code of
01 - 08
. Check code and proceed
as follows:
01:
Failure to ignite (see 6.5.5). To re-set
turn mode selector switch to re-set position
for approximately 10 seconds, then back to
original position.
02:
Overheat - Normally associated with
either poor or lack of primary water circula-
tion. Wait for appliance to cool then re-set
as described for code 01.
03:
Problem with fan/flue. Re-set as de-
scribed for code 01.
04:
Insufficient water pressure or poor flow
in system. Check pressure gauge reading,
if low restore pressure (see 6.3.3) then re-
set as described in code 01. If the pressure
gauge reading is correct check for sufficient
primary water movement or correct opera-
tion of flow switch. Re-set as described for
code 01.
05:
Re-set as described for code 01.
06:
Hot water thermistor open circuit.
07:
Primary thermistor open circuit.
08:
Re-set as described for code 01.