Dunkirk 95M-200 Control Manual And Troubleshooting Manual page 10

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 fi re 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 fl ue gas reading and observe
% CO and CO values. Adjust throttle screw until
2
correct readings are reached.
12.
Turning throttle screw clockwise decreases rate and
CO value. Turning throttle screw counter clockwise
2
increases rate and CO
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 fi re mode as described in "User
Interface Quick Reference" section. Check CO
stated in Step 5. Low fi re and high fi re values should be
approximately same.
15.
After adjustments are made stop appliance. Disconnect
pressure gauge, tighten inlet pressure tap on gas valve,
remove CO meter from CPVC pipe, and seal hole with
2
¼" NPT black iron plug. Use thread sealing compound
or tefl on 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 effi cient
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.
6 - CHECKOUT PROCEDURES AND ADJUSTMENTS
value.
2
2
8.
Boiler must be in high fi re mode for this operation. See
"User Interface Quick Reference" section 10, for more
information on placing boiler in high fi re mode.
Calculate BTUH Input Rate as follows:
Btuh input rate =
9.
Measured input rate varies with vent length, gas
calorifi c content, altitude and ambient temperature.
Set boiler with combustion specifi cations in "Boiler
Adjustment" section 6 page 9.
Determine Lp Gas Input Rate
Determine LP gas input rate by measuring C0
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.
level as
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.
Figure 2 Multimeter
10
3600 x heating value from Step 4
time in seconds
produced
2