Burnham Independence IN10 - Manual (Page 39)

9
L. Water Boiler with Continuous Ignition (Standing Pilot)
and Intermittent Circulation. See Figure 39.
1. Normal Operation
a. Thermostat calls for heat.
b. Vent Damper (if used) opens as stated in Vent
Damper Sequence of Operation.
c. Gas Valve(s) is energized allowing main gas flow
and ignition of Main Burners.
d. After Thermostat is satisfied Gas Valve(s) is de-
energized, extinguishing main flame. Vent
Damper (if used) closes.
2. Safety Shutdown
a. Limit: Automatically interrupts main burner
operation when water temperature exceeds set
point. Maximum allowable temperature is 250°F.
Normal operation resumes when water
temperature falls below set point.
b. Blocked Vent Switch. Automatically interrupts
main burner operation when excessive vent
system blockage occurs. Control is a multiple
use device. If blocked vent switch is activated do
not attempt to place boiler in operation. Correct
source of blockage and reset blocked vent
switch.
c. Flame Roll-out Switch. Automatically interrupts
boiler operation when flames or excessive heat
are present in vestibule. Control is single use
device. If flame roll-out switch is activated do
not attempt to place boiler in operation. Correct
source of blockage and replace flame roll-out
switch.
d. Thermocouple: senses pilot flame and causes gas
valve to turn off main burner and pilot burner gas
flow should pilot burner flame extinguish.