13
Operating conditions
Requirements/notes
M22
M62/M82 with-
out econo-
miser
M62/M82 with
condensing
ECO
M62/M82 with
non-condens-
ing ECO
1.
Heating water flow rate
No minimum heating water flow rate required
2.
Boiler return temperature
(minimum
value)
■
Gas operation:
55 °C
55 °C
55 °C
65 °C
■
Oil operation:
50 °C
50 °C
50 °C
65 °C
3.
Minimum flow temperature
70 °C
4.
Minimum water inlet temperature
See boiler re-
turn tempera-
ture
Recommenda-
tion for con-
densing ECO:
30 °C for high
condensation
rate
See boiler re-
turn tempera-
ture
5.
Max. temperature spread
For gas and oil operation
50 K
50 K
50 K
40 K
6.
Multi stage burner operation
None
7.
Modulating burner operation
None
8.
Setback mode
Single boiler system
Operation with minimum flow temperature
Multi boiler system
■
Lead boiler
Operation with minimum flow temperature
■
Lag boiler
Lag boilers can be shut down
Weekend setback
See setback mode
Tab. 3
Note
Boiler types M62 and M82: Condensing and non-
condensing ECOs
Use EL fuel oil only as a substitute fuel for condensing
and non-condensing ECOs.
If using S fuel oil, only use on-site economisers that
are suitable for this purpose.
Note
For boiler types M62 and M82 without economiser: If
burning S fuel oil, the average boiler water tempera-
ture must be at least 90 °C according to DIN 51603-5.
Boiler datasheet
See chapter "Standard values for water quality"
on page 9
Recommendation
Do not interrupt boiler operation, even if heat is tempo-
rarily not being drawn off.
Maintain the following at all times
■
Minimum flow temperature
■
Specified operating pressure
Multi boiler systems with a boiler on permanent
standby:
Operational changeovers should be infrequent,
for example during the annual inspection of the overall
system.
Protecting the boiler from dew point corrosion
■
Adjust the full burner load to the rated boiler heating
output.
■
Leave the boiler switched on even during the sum-
mer months (full load on constant standby).
■
The minimum flow temperature of 70 °C is not under-
shot.
■
In multi boiler systems, boilers can be shut down by
having boiler water from the rest of the boiler system
flow through them.
Normal operation
Operating conditions
6152553
Service
Summary of Contents for M22
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