PV700a / PV1000a pellet burners
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DK9401B1 www.pelltech.eu
Table 9 Summary of burner statuses
Status
Short description
WAITING
Waiting when boiler’s thermostat switches on.
TESTING
Boiler’s thermostat is switched on, testing the battery, fans, feeder, level sensors and
draught in progress.
CLEANING
Ash removing from burning chamber.
LOADING
Loading pellets with external auger into burner and by feeder auger into burning
chamber.
IGNITING
Igniter is turned on, pellets are ignited.
PRE-BURN
Flame is recognized, small amount of pellets is added by feeder auger.
HEAT UP
Burning chamber ceramic stones are heated up.
BURNING
Normal burning operation.
HOLD FLAME
Thermostat is switched off, small flame is held alive.
END BURN
Thermostat is switched off, feeder is burned up.
END BLOW
Pellet coals in burning chamber are burnt, flame has disappeared.
WAITING
Burner waits when boiler’s thermostat switches on.
At
WAITING
status, the burner waits when boiler’s thermostat switches. There is no time limit for
WAITING status. Only feeder auger is working periodically at WAITING status and makes ½ rotations
after every 2 minutes. With this feeder augers spiral cleans feeder’s tube from wastes.
When boilers thermostat switches on, burner will go to TESTING.
At
TESTING
status, burner‘s integrity and important device functioning are checked. List of tests is given
in Table 10.
Table 10 List of tests in TESTING status
Test name
PAR No
Value
Unit
Test conditions
Battery voltage
-
22
V
Battery loading is turned OFF and feeder is turned ON -
voltage must be greater than 24V.
Feeder current
PAR 46
3..6
A
Feeder auger is turned ON – feeder current must be smaller
than PAR 46.
Draught
PAR62
+10
Pa
All fans are turned on. Draft must be under PAR 62.
Primary fan
PAR4
38
rot
Fan must rotate faster than 35rot = 38 (PAR4) – 3.
Secondary fan
PAR4
38
rot
Fan must rotate faster than 35rot = 38 (PAR4) – 3.
At
CLEANING
cycle, the linear actuator moves the grates and pushes out from burning chamber the ash
and residues. The cleaning cycle has been divided into 3 steps:
1.
Grates are pulled fully in to actuator end limit.
2.
Grates are pushed fully out to actuator end limit.
3.
Grates are moved to middle position.