Janfire NH Burner Service Installation Manual 4.16.09 - Technical specifications are subject to change without prior
notice.
28(38
)
36. Aft. bl. 61 MBTU
time:
1:00
How long the fan blows at 18 kW (minutes) see 24-30
37. Aft. bl. 78 MBTU
time:
1:00
How long the fan blows at 23 kW (minutes) see 24-30
38. Interme. blow
Interval:
30:00
After what time intervals (min) shall the fan increase the speed
when running for long intervals without the thermostat turning off.
Applicable for all steps.
39. Interme. blow
fan:
+ 5%
Fan speed increase in % at output levels (see 38)
40. Interme. blow
time:
0:30
For how long shall the fan medium blow (min)
See 38 and 39
41. External feed
alarm time:
2:00
(1:00 – 10:00)
Max run time (in min) for external auger without capacity sensor
signalling to stop & subsequent alarm activation.
42. N/A
43. External feed
afterrun:
3:00
(0 – 10)
The time (seconds) that the external auger continues to run after
the capacity sensor is activated.
44. Ashscrape
Alarm time:
0:23
:01 - :30
Maximum time (sec) for the ash scraper to run and activate the
capacity sensor.
45. Ashscrape
retries:
6
pcs.
(0 – 10)
If the ash scraper is stuck when trying to scrape, motor will turn off
after 3 sec (according to alarm time see 44) New scraping
attempts will be made according to this setting. (6 times)
46. Restart
retries:
2 pcs.
(0 – 10)
Indicates number of retries after burner start-up failure (flame
sensor not activated). Number of retries specified by this setting.
(1 PCS = one attempt)
47. Flameguard
(xxx °F)
302 °F
50 - 392
o
F
A temperature from which the burner is switched from the start-up
sequence to normal operation. If during normal operation the
burner bowl drops 18
o
below this setting a single restart attempt
will be enabled. Flameguard is not applicable during maintenance
fire.
48. Cooling to
(xxx °F)
248 °F
68 - 392
o
F
When ”shutdown” is selected in the operating level, an ash scrape
will be initiated at or below this selected temperature. Actual
Burner Bowl temperature shown in brackets.
49. Reduction:
(xxx °F)
158 °F
50 - 194
o
F
If temperature in pellet drop shaft exceeds this value, burner
output level is reduced and control lamp turns yellow. The
temperature must be set at least 8 °F (5°C) below alarm limit (see
50). Actual temperature is shown in brackets.
50. Alarm limit:
(xxx °F)
203 °F
167-284
o
F
If temperature in pellet drop shaft exceeds this value in spite of
the reduced burner output (see 49), burner will stop with an over
heating alarm. Temperature must be set at least 8 °F (5°C) above
’Reduction limit’ (see 49). Actual temperature is shown in
brackets.
51. Restart limit
(xxx °F)
428 °F
50 – 842
o
F
Restart limit is active only after a complete loss of power is
restored to the NH Burner such as: The High Limit opens, LWCO
opens, loss of grid power or shutting off the service switch. The
NH Burner will decide at this setting to either initiate an ash
scaping (below) or continue in run mode (above setting). Actual