52
9
Start-up
Installation & Service Manual
Check flame and combustion
1. Shut the water heater down by pressing the UP button for
five (5) seconds.
2. Locate the flue sensor in the vent connection. Remove the
flue sensor and grommet from the unit.
Note:
Combustion
measurements will be made at this point.
3. Place the water heater in active position by pressing the UP
button for five (5) seconds.
4. Place the water heater in Service Mode by pressing the
►
and
▼
buttons simultaneously for 5 seconds.
5. Insert the probe from a combustion analyzer into the hole
left by the removal of the flue temperature sensor.
6. Once the water heater has modulated up to full fire, measure
the combustion. The values should be in the range listed in
Table 9C. The CO levels should be less than 150 ppm for a
properly installed unit.
If the combustion is not within the specified range, reference
the
Troubleshooting
section of this manual for possible causes
and corrective actions.
7. Once the combustion analysis is complete, exit Service
Mode.
▲/▼ -
Change the target fan speed in increments of 100 rpm.
► -
Toggle between operating at high fire and low fire.
◄
-
Exit Service Mode and return to the Home Screen.
8. Replace the flue sensor and grommet into the vent
connection.
9. Place the Shield water heater back into normal operation.
You must replace the flue sensor to prevent
flue gas spillage into the room. Failure
to comply could result in severe personal
injury, death, or substantial property
damage.
⚠
WARNING
Table 9C
Flue Products Chart
Natural Gas
Input Rate
Target
Range
CO
2
O
2
CO
2
O
2
High Fire
9.2%
4.5%
9.0% - 10.5%
2.1% - 4.8%
Low Fire
9.0%
4.8%
8.8% - 9.5%
3.9% - 5.2%
Propane
Input Rate
Target
Range
CO
2
O
2
CO
2
O
2
High Fire
10.8%
4.5%
10.5% - 11.5% 3.5% - 5.0%
Low Fire
10.5%
5.0%
10.0% - 11.0% 4.2% - 5.8%
