Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 10)

10
6 - CHECKOUT PROCEDURES AND ADJUSTMENTS
Figure 2 Multimeter
8. Drill ½” hole in plastic CPVC vent pipe or exhaust
tee, just large enough to allow access for combustion
analyzer sample probe.
9. Turn thermostat to closed position so appliance is
activated.
10. Set appliance to high fire mode as described in “User
Interface Quick Reference” section 10 page 21 and
allow it to run for approximately 5 minutes.
11. Insert sample probe of your combustion analyzer into
drilled hole from Step 8. Insert about halfway into
exhaust gas stream. Take flue gas reading and observe
% CO
2
and CO values. Adjust throttle screw until
correct readings are reached.
12. Turning throttle screw clockwise decreases rate and
CO
2
value. Turning throttle screw counter clockwise
increases rate and CO
2
value.
13. Allow appliance to stabilize for one minute after
adjusting throttle screw before you take reading with
combustion analyzer.
NOTICE
CO levels should not exceed 80 ppm.
14. Set appliance to low fire mode as described in “User
Interface Quick Reference” section. Check CO
2
level as
stated in Step 5. Low fire and high fire values should be
approximately same.
15. After adjustments are made stop appliance. Disconnect
pressure gauge, tighten inlet pressure tap on gas valve,
remove CO
2
meter from CPVC pipe, and seal hole with
¼” NPT black iron plug. Use thread sealing compound
or teflon tape to ensure proper seal.
16. Return thermostat switch to its original position.
Measure Natural Gas Input Rate
1.
Correct input rate is essential for proper and efficient
operation of burner and boiler.
2. Determine elevation at installation site.
3. See “Installation, Operation and Maintenance Manual”
to determine correct approximate input rate for local
elevation.
4. Obtain yearly average heating value of local gas utility.
At sea level elevation, it should be about 1000 BTU per
standard cubic foot.
5. Operate boiler for 5 minutes.
6. Turn off all other gas appliances, extinguishing standing
pilots where applicable.
7. At gas meter, measure time in seconds required to use
one cubic foot of gas.
8. Boiler must be in high fire mode for this operation. See
“User Interface Quick Reference” section 10, for more
information on placing boiler in high fire mode.
Calculate BTUH Input Rate as follows:
Btuh input rate = 3600 x heating value from Step 4
time in seconds
9. Measured input rate varies with vent length, gas
calorific content, altitude and ambient temperature.
Set boiler with combustion specifications in “Boiler
Adjustment” section 6 page 9.
Determine Lp Gas Input Rate
Determine LP gas input rate by measuring C0
2
produced
during combustion. Set this value according to guidelines
table on page 11.
Measure Flame Sense
Flame sense can be indicator of issues with air intake
venting, exhaust venting, burner and ignitor condition and
supply gas piping pressure.
Use multi meter capable of reading 0-20 VDC.
Attach one lead to “F” terminal on low voltage terminal
block on boiler control.
Attach other lead to any ground surface on boiler. See
Figure 2.
Flame sense voltage shall be in accordance with values
listed in Flame Signal Guidelines chart page 11.