3. Close the manual gas shutoff valve located
between the Safety Shut-Off Valve (SSOV)
and the Air/Fuel Valve (see Figure 6-3).
6.8 AIR FLOW FAULT TESTS
These tests check the operation of the Blower
Proof Switch and Blocked Inlet Switch shown in
Figure 6-3.
1. Disable the blower output drive voltage as
follows:
(a) Press the MENU key until CONFIGUR-
ATION MENU is displayed.
(b) Press the ▲ arrow key until the ANA-
LOG OUTPUT function is displayed,
then press the CHANGE key.
(c) Press the ▼ arrow key until OFF is
displayed, then press the ENTER key.
2. Start the unit in the Manual Mode at a valve
position between 25% and 30%.
3. The unit should shut down and display
Figure 6-3
Manual Gas Shut-Off Valve Location
4. Set the ON/OFF switch to the ON position to
start the unit.
5. The unit should shut down after reaching the
Ignition cycle and display FLAME LOSS
DURING IGN.
6. Open the valve previously closed in step 3
and press the CLEAR button.
7. Restart the unit and allow it to prove flame.
8. Once flame is proven, close the manual gas
valve located between the SSOV and the
Air/Fuel Valve.
9. The unit should shut down and
display
FLAME LOSS DURING RUN.
10.Open the valve previously closed in step 8.
11.Press the CLEAR button. The unit should
restart and fire.
AIRFLOW FAULT DURING PURGE.
4. Re-enable the blower output drive voltage by
performing the following steps:
(a) Press the MENU key until CONFIGUR-
ATION MENU is displayed.
(b) Press the ▲ arrow key until the ANA-
LOG OUTPUT function is displayed,
then press the CHANGE key.
(c) Press the ▲ arrow key until VALVE
POSITION 0-10V is displayed, then
press the ENTER key.
5. Once the unit has proved flame, turn off the
blower by going to the Configuration Menu,
Analog Output menu item and select OFF.
6. The Blower Proof Switch will open and the
blower should stop. The unit should shut
down and display AIRFLOW FAULT
DURING RUN.
7. Go to the Configuration Menu, Analog Output
item and select Valve Position 0-10v.
8. Press the CLEAR button. The unit should
restart.
9. Next, check the Blocked Inlet Switch by first
noting the current position of the Iris Air
Damper and then closing the Damper to
position 8.
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