PV700a / PV1000a pellet burners
p
39/ 59
DK9401B1 www.pelltech.eu
Figure 35 SLOW DOWN mode
The purpose of
HOLD FLAME
mode is to avoid burner start-up procedures i.e TESTING, CLEANING,
LOADING, IGNITING etc. every time, when burner is switched on from boiler thermostat. In HOLD FLAME
mode, minimum fuel and air amount are delivered to burning chamber. HOLD FLAME mode can be
switched on from burner main menu. When HOLD FLAME is set to AUTO, burner will turn the mode ON
or OFF depending on WAITING time:
If WAITING (time between END BLOW and boiler thermostat switched on) is shorter than set in
PAR 11, then HOLD FLAME mode will be switched on.
If HOLD FLAME time is longer than set in PAR12, HOLD FLAME mode is switched off.
HOLD FLAME is also used as intermediate state before CLEANING or after SLOW DOWN.
Table 17 HOLD FLAME parameters
PAR No
Parameter name
Default
value
Unit
Comment
PAR10
FAN@HOLD FLAME
10
rps
Primary fan speed at HOLD FLAME
PAR39
FAN 2 MIN
7
rps
Minimum speed of secondary fan. Used at IGNITION,
PREBURN, HEAT UP, HOLD FLAME and END BLOW
statuses.
PAR11
HOLD FLAME ON
15
min
If two consecutive WAITING states have been
shorter than 15 min, HOLD FLAME will be activated.
PAR12
HOLD FLAME OFF
60
min
Maximum time when burner holds flame.
The
END BURN
cycle helps securely to stop burning procedure in burning chamber of burner. All pellets
inside the burning chamber and feeder tubes will be burnt. Amounts of pellets delivered and fan rotation
speed (power level) are same as in BURNING status. If burner goes to END BURN from other states (e. g.
HOLD FLAME), the first power level is selected. Burner works in END BURN until feeder tube is empty -
feeder has made as many rotations as selected in PAR26. END BURN can be used in case of some
P
ow
er
lev
el
Status/time
Par 18
3
2
1
4
5
6
7
Operation power
Thermostat OFF
„Burning“
„Slow down“
„Burn end“
„Hold flame“
Thermostat ON
„Slow
down“
„Burning“
Par 17
OR
