Freestyle 2 Series - Page 90

Part number 550-142-950/0122
90
FreeStyle
®
series 2 wall mount gas-fired water boiler – boiler manual
1. Heat demand detection time
CH mode: there is a conrming time of 3 seconds during
which the demand has to be always on.
e request switch is sampled every 0.2 seconds, so the
maximum delay is 3.2 seconds.
DHW instant mode: Combi boiler the maximum delay
is 0.2 seconds which is the sample time of the ow sensor.
DHW storage mode: Heating Only boiler with Indirect
tank the maximum delay is 0.2 seconds which is the
sample time of the tank thermostat.
2. Pre-pump time
CH instant mode: CH - Pump time 30 seconds.
DHW instant mode: there is no pre-pump.
DHW storage mode: DHW Pre-pump time 30 seconds.
3. Pre-purge time
It is the time that the fan takes to reach the ignition level
to eectively purge boiler venting.
4. Ignition
ere are 0.2 seconds of preignition where the control
checks the status of the gas valve. And then there is the
Check ignition sequence
e ignition sequence time line and operational description for the Combi and Heating Only boiler below help to understand the
timing of the cycles. In your troubleshooting, refer to the numbers 1 through 7 as they describe each step of the ignition cycle.
37 Troubleshooting (continued)
Figure 114 Time line of ignition sequence for the Combi and Heating Only boilers
spark, for a time depends on the gas type:
Natural Gas, 1.6 seconds.
LP Gas, 4.6 seconds.
5. Gas valve safety time
With no ame the gas valve can be kept open for certain time:
Natural Gas, 3 seconds.
LP Gas, 4.8 seconds.
If at the end of this time the ame is not ionized, the gas
valve has to be closed and the inter-purge time for 6 at-
tempts is ran.
6. Inter-purge time for A01 attempts
ere is 10 seconds of purge time before a new attempt
aer a faulty ignition. Aer 5 attempts the boiler goes into
Lockout (code “A01”). is error condition is stopping the
boiler and to get to normal operation again, manual reset is
required.
7. Inter-purge time for A06 attempts
ere is 1 second of purge time before a new attempt aer
a lost ame. If the ame disappeared 3 consecutive times
within 10 minutes, the boiler goes into Lockout (code
“A06”) to get to normal operation again, manual reset is
required.
HEAT DEMAND
DETECTION TIME
PRE-PUMP TIME PRE-PURGE TIME
IGNITION
GAS VALVE SAFETY TIME
IGNITION
INTER-PURGE FOR
A01 ATTEMPTS
IGNITION
INTER-PURGE FOR
A06 ATTEMPTS
FLAME LOSS