Burnham K2WTC Installation, Operating And Service Instructions page 104

7. Ignition Failure
The Control monitors ignition using a burner mounted
flame sensor. In the event of an ignition failure, the
control retries 5 times and then goes into soft lockout
for one hour.
8. Central Heating System Frost Protection
When enabled, Frost Protection starts the boiler and
system pump and fires the boiler when low outside air
and low supply water temperatures are sensed. The
Control provides the following control action when
frost protection is enabled:
Table 13.2: Frost Protection
Device Start
Started Temperatures
Outside Air < 0°F (-18°C)
Boiler Pump
Supply Water < 45°F (7.2°C)
Boiler Supply Water < 38°F (3.3°C) Supply Water > 50°F (10°C)
The Control helps provide freeze protection
for the boiler water. Boiler flue gas
condensate drain is not protected from
freezing. Since the Control only controls
the system and boiler circulators individual
zones are not protected. It is recommended
that the boiler be installed in a location that
is not exposed to freezing temperatures.
D. Multiple Boiler Control Sequencer
This boiler may be used as a slave in a multiple boiler
system where the other boilers employ the same
control. Consult factory for additional information on
doing this.
104
XIII. Operation
Stop
Temperatures
Outside Air > 4°F (-16°C)
Supply Water > 50°F (10°C)
CAUTION
(continued)
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