Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 9)

9
Figure 1 - Gas Valve
Verify Sequence Of Operation
Detailed sequence of operation containing faults can be
found in Sections 7, “Detailed Sequence of Operation.”
Refer to this section and Section 8, “Service Hints,” for
more information.
Inspect Venting And Air Intake
Operate boiler and verify all vent/air intake connections are
gas tight and watertight. Repair any leaks immediately.
Inspect Condensate Drain And System Piping
Verify condensate flows freely and all connections are
watertight. Repair any leaks immediately.
Test Ignition System Safety Shutoff Device
1.
Remove front panel from appliance.
2. Turn off manual gas ball valve.
3. Set thermostat for a call for heat.
4. Boiler begins normal sequence of operation.
5. After approximately 30 seconds of pre-purge appliance
will attempt to light.
6. After 4 seconds gas valve closes and control retries 5
times, before entering lockout mode.
7. To reset the control, follow the instructions in Section
IV of this manual, “Putting The Boiler In Operation.”
8. Return thermostat to previous setting.
Test And Adjust High Limit Control
• With burner operating, adjust setting on high limit
control below actual boiler water temperature.
• Burner will go off while circulator continues to operate.
• Raise limit setting above boiler water temperature and
burner will reignite after pre purge and igniter warm-up
period.
• Set high limit control to 10°F above parameter 4
setting as described in “Parameter Guide”.
• Maximum high limit setting is 200°F. Minimum high
limit setting is 100°F.
Test Low Water Cut Off
1.
Disconnect wire from LWCO sensor probe.
2. Set thermostat for call for heat.
3. Boiler will not begin normal sequence of operation.
4. Attach wire to sensor probe.
5. Return thermostat to previous setting.
Test Other Field Installed Safety Controls (if
used)
If boiler is equipped with any additional safety controls, test
for operation as outlined by control manufacturer. Burner
should be operating and go off when controls are tested.
When safety controls are restored, burner should reignite.
Set Field Installed Thermostat
Heat Anticipator (if used)
• For single thermostat connected to T-T screw terminals
on low voltage terminal strip on control board of boiler,
set heat anticipator at 0.1 amps.
• For other wiring configurations, refer to instructions
provided by thermostat manufacturer regarding heat
anticipator adjustment.
• Cycle boiler with thermostat. Raise thermostat to
highest setting. Verify boiler goes through normal start
up cycle. Lower thermostat to lowest setting. Verify
boiler goes off.
Boiler Adjustment
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.
2. Close gas shutoff inside boiler jacket.
3. Locate inlet pressure tap on gas valve. See Figure 1.
4. Open inlet pressure tap screw ½ turn.
5. Connect positive side of gauge to inlet pressure tap.
6. Open gas shutoff.
7. Gas pressure at high fire should read between 4” and
10” w.c. for natural gas and between 10” and 14” w.c.
for LP gas.
6 - CHECKOUT PROCEDURES AND ADJUSTMENTS