Technical instructions Cm Pelet-set
13
heater works until flame appears and control unit starts monitoring operation of the photo-cell. If photo-
cell detects flame within the safety time (12 min.), heater will work for another 60 seconds and then it
turns off.
After photo-cell has detected flame, control unit checks for 10 seconds whether flame is stabilized and
turns on indication
for presence of flame in the burner. Since that moment time required for good
flame is running.
8.2 Transition phase
After pellets blaze up, transition phase of the burner operation starts wherein the burner output is
increasing gradually to the set power. During that period proper basis for further pellet combustion is
being prepared.
8.3 Operating phase
After transition phase ends, the burner starts to work at set parameters (set output).
Operation in winter regime
:
Control unit monitors boiler temperature and, if necessary for heating (or room thermostat gives such
instruction to the pump) and sanitary water, boiler temperature reached 61
0
C, heating pumps and
sanitary water pump turn on (if sanitary water is enabled). If boiler temperature drops below 59
0
C,
pumps turn off (regardless the needs). When the boiler reaches temperature of T
set
- 4
0
C, control unit
reduces the burner output for 2 stages (e.g. from P6 to P4), and if temperature continues to rise and
reaches temperature T
set
—2
0
C, control unit will again reduce the burner output by 2 stages (e.g. from
P4 to P2) and, when the boiler reaches temperature of T
set
, the burner starts extinction procedure. If
the boiler reached T
set
- 4
0
C, but it cannot reach temperature T
set
—2
0
C within 3 minutes the burner
returns to set output and, when boiler reaches temperature T
set
—2
0
C, control unit will reduce burner
output by 2 stages. If in that operating regime boiler does not reach temperature T
set
within 2 minutes,
the burner resumes to set output and at temperature T
set
the burner the burner starts extinction
procedure. The burner re-ignites when the boiler temperature drops below T
set
- 5
0
C.
Operation in summer regime
:
a) With sanitary water tank (next to the tank)
If we wish to use boiler for heating of sanitary water only, either in stand alone or wall mounted
sanitary water tank and not to turn on the heating pump, summer regime must be turned on, sanitary
water sensor must be connected (to connector 4 at the control unit box) and programme Pr02 must be
enabled (On). In programme Pr02 preferred sanitary water temperature is set (40
0
C to 80
0
C) and set
boiler temperature T
set
is determined according to T
preferred sanitary
+ 10
0
C (min. boiler temperature is
always 65
0
C). Hysteresis of sanitary pump operation is fixed, factory set to 5
0
C. Sanitary water pump
always turns on at boiler temperature of min. 61
0
C and turns off at 59
0
C. The burner works according
to the set operation regime until it reaches T
preferred sanitary
+ 10
0
C
– 4
0
C when control unit reduces the
burner output by 2 stages and, if temperature continues to rise and reaches temperature T
preferred sanitary
+ 10
0
C
– 2
0
C, it reduces again the burner output by 2 stages and, when the boiler reaches
temperature T
preferred sanitary
+ 10
0
C burner starts extinction phase. If the boiler reaches T
preferred sanitary
+
10
0
C
– 4
0
C but it cannot reach temperature T
preferred sanitary
+ 10
0
C
– 2
0
C within 3 minutes, the burner
resumes to the set output and, when the boiler reaches temperature T
preferred sanitary
+ 10
0
C
– 2
0
C
control unit reduces the burner output by 2 stages.
If in that operating regime boiler does not reach temperature T
preferred sanitary
+ 10
0
C within 2 minutes, the
burner resumes to set output and at temperature T
preferred sanitary
+ 10
0
C the burner the burner starts
extinction procedure. The burner re-ignites when the boiler temperature drops below T
preferred sanitary
+
10
0
C - 5
0
C.
