Dunkirk Q90-200 Series II - Manual (Page 37)

37
Set Thermostat To Desired Temperature
Set thermostat to desired room temperature and observe
several complete cycles to verify proper operation.
Final Review And Sign-Off
Review all instructions shipped with this boiler with owner
or maintenance person. Affix instructions on or adjacent to
boiler.
14 - CHECKOUT PROCEDURE & ADJUSTMENTS
Adjustments And Checkout
Appliance should operate between 8.5 And 10% CO2.
Verify boiler is operating in this range. Follow steps below.
NOTICE
Under all conditions CO levels should not exceed
100ppm.
1.
Check incoming gas pressure to appliance using
pressure gauge with resolution of 0.1” w.c. or better
and range from 0” to at least 14” w.c.
A. Close gas shut-off inside boiler jacket.
B. Locate inlet pressure tap on gas valve. Figure 18,
Page 26.
C. Open inlet pressure tap screw ½ turn. Connect
positive side of pressure gauge to inlet pressure
tap.
D. Open gas shut-off.
E. Gas pressure
• between 4” and 10” w.c. natural gas
• between 10” and 14” w.c. propane gas.
2.
Drill hole in plastic CPVC pipe for combustion analyzer.
3.
Turn thermostat to closed position to activate boiler.
4.
Allow boiler to run for 5 minutes.
5.
Insert combustion analyzer sample probe into hole just
drilled, about halfway into exhaust gas stream.
A. Take flue gas reading and observe CO2 value.
B. Adjust throttle screw until CO2 value is between
8.5 And 10%. (O2 between 5.5% and 2%)
C. Turning throttle screw counter clockwise increases
rate and CO2 value.
D. Turning throttle screw clockwise decreases rate and
CO2 value.
E. Allow boiler to stabilize for 1 minute after adjusting
throttle screw before taking reading with
combustion analyzer.
6.
After adjustments are made stop appliance. Disconnect
pressure gauge. Tighten inlet pressure tap on gas
valve, remove CO2 meter from CPVC pipe.
7.
Seal hole in CPVC pipe with appropriate material.
8.
Return thermostat switch to its original position.
Installation Final Checkout
After any adjustment to boiler, observe several complete
cycles to ensure all components function correctly.