Installation manual

Coopra Advanced Heating Technologies Installation manual 40 EN
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CHAPTER 6. BURNER STATES and MONITORING
Pump
Standby Pre rinse Ignition In operation Post rinse
afterrun
Standby
heat demand
fan
gas valve
glow plug
ionisation
pump
t=0sec t=3sec t=7sec t<12sec
6.1. Standby
Fan off - Gas valve off – Glow plug off - Ionisation off
During the standby, a check is made to see if there is burner
demand. If so the boiler will go over to pre rise.
If the glow plug counter is too high (the boiler made too many
starts repeatidly) the regulation blocks the burner demand.
Once per hour, if there is no heat demand, the difference
between flow and return temperatures must be less than ± 5°C.
If this is not the case, the pump will be switched on and a check
will be made for a maximum of 10 minutes to see whether the
temperature difference goes to within ± 5°C.
The display shows flashing ‘8’.
If a false flame signal is detected during standby for more than 5
seconds, the regulation runs into lock-out with flashing indication
‘8’:
6.2. Pre rinse
Fan on - Gas valve off - Glow plug on - Ionisation off
The difference between flow and return temperatures must be
less than 20°C before each burner start.
Pump:
At each new heat demand first the pump is switched off for 3
seconds and the water pressure (static pressure) is measured
and stored in the software.
Then second the pump is switched to high speed and the water
pressure (active pump pressure) is measured and stored in the
software.
If the difference between the active pump pressure and the static
pressure is between 0.05 and 0.54 bar a correct water flow
throuhg the heat exchanger is present and the ignition time
starts.
If the difference is less than 0.05 bar or more than 0.54 bar the
regulation locks. The display shows ‘P’. The regulation runs into
the “pump test program”.
Fan:
The fan is switched on at the desired purging speed.
After a few seconds, the fan goes from purging speed to the
faster ignition speed.
Glow plug:
The glow plug is switched on at the same time as the fan.
The display shows flashing ‘5’.
When the measured fan speed deviates from the desired speed
the regulation blocks.
After 60 seconds the regulation runs into lock-out, with flashing
indication ‘5’.
6.3. Ignition
Fan on - Gas valve on - Glow plug on/off - Ionisation off/on
The fan is running at the ignition speed. The gas valve is
activated. The glow plug ignites the gas / air mixture from the
burner. The glow plug will be switched off as soon as an
ionisation signal is measured.
If there is no ionisation at the end of the safety time, a new
attempt at ignition will be made if this was not the last permitted
(third) attempt at starting.
6.4. In operation
Fan on - Gas valve on - Glow plug off - Ionisation on
Temperature test:
To ensure the water flow through the heat exchanger a
temperature test is activated.
The difference between flow and return temperatures must be
raised by 3°C within 20 seconds after each burner start.
If the difference is less than the previous temperature difference,
the burner is started again after 10 seconds.
If this lock occurs more than three times within a heat demand,
the regulation locks with ‘1’.
If the difference between flow and return temperatures becomes
less than –5°C during burning, the regulation locks.