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OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 61 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 6: SAFETY DEVICE TESTING
6. When the Controller gets into the ignition phase, it will show
Ignition Trial
. At that point
attach the alligator clip (Figure 6-9) to any bare metal surface or ground. The Controller
displays
Flame Proven
and begins to ramp up to 100% fire rate. Note that no gas or
flame is present in the Water Heater at this time.
7. Wait for the unit to ramp up to at least 90% before continuing.
8. Cover the combustion air inlet opening with a solid, flat object, such as a piece of thick
plywood or a thick metal plate.
9. The unit should shut down and display
Airflow Fault During Run
. This step confirms
proper operation of the Blocked Inlet switch.
10. Remove cover from air inlet opening and reinstall the Combustion Air Duct or air filter.
11. Remove jumper wires installed in step 3 and replace the black connector boot on the
Flame Detector.
12. Press the
CLEAR
button. The unit should restart.
6.9 SSOV Proof of Closure Switch Check
The SSOV (shown in Figure 6-7) contains the
Proof of Closure
switch. The
Proof of Closure
switch circuit is checked as follows:
1.
Set the Controller’s
Enable/Disable
switch to
Disable
.
2. Go to
Main Menu
→
Diagnostics
→
Manual Run
and enable
Manual Mode
.
3. Set the valve position
between 25% and 30%
using the
+
(Plus) and
–
(Minus) controls.
4. Loosen the SSOV cover screw and remove cover to access wiring connections.
5. Disconnect wire #1304
from the SSOV to “open” the Proof of Closure switch circuit.
6. The unit should fault and display
SSOV Switch Open
.
7. Replace wire #1304 and press the
CLEAR
button.
8. Set the
Controller’s
Enable/Disable
switch to
Enable
to start the unit.
9. Remove the wire again when the unit reaches the purge cycle and
Purging
is displayed.
10. The unit should shut down and display
SSOV Fault During Purge
.
11. Replace the wire on the SSOV and press the
CLEAR
button. The unit should restart.
6.10 Purge Switch Open During Purge
The
Purge
switch (and
Ignition
switch) is located on the Air/Fuel Valve. To check the switch:
1.
Set the Controller’s
Enable/Disable
switch to
Disable
.
2. Go to
Main Menu
→
Diagnostics
→
Manual Run
and enable
Manual Mode
.
3. Set the valve position
between 25% and 30%
using the
+
(Plus) and
–
(Minus) controls.
4. Remove the Air/Fuel Valve cover by rotating the cover counterclockwise to unlock it.
5. Remove one of the two wires (#1609 or #1610) from the Purge switch (Figure 6-11).
6.
Set the Controller’s
Enable/Disable
switch to
Enable
to start the unit.
7. The unit should begin its start sequence, then shut down and display
Prg Switch Open
During Purge
.
8. Replace wire on the Ignition switch and press
CLEAR
button. The unit should restart.