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2.8.1
General operating conditions
Min. boiler water
temperature
If heating zones or a boiler
circuit actuator cannot be
regulated via the control
device (for example pump
logic), an operating
temperature of 122 °F
(50 °C) must be reached
within 10 min of switching
the burner ON by
restricting the water
volume flow.
In conjunction with a controls for constant boiler water temperatures or with supplementary external programmer and aquastat
2)
2
150 °F
(65 °C
)
Table 5
General operating conditions
1) A heating circuit with a mixing valve improves controllability and is specifically recommended for systems with several heating
zones.
2) Boiler water temperature control setting: when the boiler is in ON mode, the minimum boiler water temperature in the boiler must
be reached within 10 minutes, e.g. by flow rate limitation, and maintained as the minimum temperature.^
2.8.2
Conditions for the boiler room and the environment
Operating conditions
Temperature in the boiler room
relative humidity
Dust/airborne particles
Halogenated-hydrocarbon
compounds
Table 6
Boiler room and ambient conditions
Operating interruption
(complete boiler shutdown)
In combination with control for variable low-temperature operating modes.
Possible if, after interruption of the
operation, there is at least 3 hours
heating operation.
possible if, after interruption of the
operation, there is at least 3 hours
heating operation
Notes – Requirement in greater detail
+40 (+5 °C) to
+104 °F (+40 °C)
max. 90 %
No condensation or precipitation inside the boiler room
Excessive dust inside the boiler room must be avoided when the boiler is operating, e. g.:
−
Dust from building work
•
Combustion air supplied from outside must not be excessively loaded with dust or
airborne particles; if necessary, air filters should be fitted in case:
Air supply contaminated with dust from dirt roads and paths.
•
Air supply contaminated with dust from production and processing facilities, e. g.
•
quarries, mines, etc.
Airborne particles from thistles and similar
•
−
The combustion air must be free from halogenated-hydrocarbon compounds.
Identify the source of halogen-hydrocarbon compounds and seal it off. Where this is
•
impossible, route combustion air from areas that are not contaminated by halogen-
hydrocarbon compounds.
Operating conditions
heating circuit with
heating circuit mixing valve
not required but recommended with
low-temperature heating system
design 130/113 °F (55 / 45 °C)
Required with:
Underfloor heating systems
•
Systems with high water content:
•
> 115° gal/MBH (>15 l/kW)
(1 MBH = 100.000 Btu/hr)
required
Product description | 11
1)
Min. return temperature
not required, except for operation
with a modulating burner for:
Oil combustion: 113 °F (45 °C)
•
Gas combustion: 130 °F (55 °C)
•
Required with:
Systems with high water content
•
> 115 gal/MBH: 130 °F (15 l/kW:
55 °C)
Operation with a modulating
•
burner: 130 °F (55 °C)
6 720 648 162 (2011/08)
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