Inspect Venting And Air Intake System; Inspect Condensate Drain; Inspect System Piping; Test Ignition System Safety Shutoff Device - Dunkirk Quantrum 90-50 Installation Manual

After pre purge, Lamp B goes out and Lamp C illuminates, in-
dicating the hot surface igniter is powered for the 20 second
igniter warm-up period. The bright yellow orange glow of the
hot surface igniter can be observed through the observation
port in the front boiler section just above the igniter.
After igniter warm-up, the gas valve is energized, and opens
on the normal firing rate regulator (2.5" w.c.) for a 6 second trial
for ignition. Lamp D illuminates. The blue orange glow of the
burner can be seen through the observation port.
Two seconds later, Lamp C goes out as power is turned off to the
hot surface igniter. During the last two seconds of the 6 seconds
trial for ignition, main burner flames is proven by flame rectifica-
tion through the hot surface igniter, providing flame rectification
to the integrated boiler control and fully illuminating Lamp E. The
gas valve remains energized, and the boiler runs.
Thermostat ends call for heat, de-energizing gas valve and
system circulator. Burner stops firing, and Lamp D goes out.
Draft inducers remains powered. Lamp B illuminates, indicating
draft inducer is running for 30 second post-purge.
After 30 seconds, draft inducer is de-energized. Lamp B goes
out. Boiler stands by for next call for heat.
NOTE: First couple of cold starts may be rough due to gas line not being completely purged of air, causing low
firing rate and high excess air levels.
B. Inspect Venting And Air Intake System
Operate the boiler and verify that all vent/air intake con-
nections are gas-tight and watertight. Repair any leaks im-
mediately.
C. Inspect Condensate Drain
Verify that all connections are watertight, and that condensate
flows freely. Repair any leaks immediately.
D. Inspect System Piping
Verify that all connections are watertight. Repair any leaks
immediately.
CHECK OUT PROCEDURE AND ADJUSTMENT
SEQUENCE OF OPERATION "DIAGNOSTIC INDICATOR LAMPS"
E. Test Ignition System Safety Shutoff Device
1.
Turn off manual gas valve
2.
Set thermostat to call for heat
3.
Boiler begins normal sequence of operation
4.
After approximately 40 seconds (pre purge and igniter
warm-up period), lamp D illuminates, indicating gas valve
is powered
5.
After 6 seconds, gas valve closes, lamp D goes out as inte-
grated boiler control senses that flame is not present
6.
To restart system, follow operating instructions under
"START-UP PLACE IN OPERATION"
43
A. 
B. 
C. 
D. 
E. 
A. 
B. 
C. 
D. 
E. 
A. 
B. 
C. 
D. 
E. 
A. 
B. 
C. 
D. 
E. 
A. 
B. 
C. 
D. 
E. 