Install Instructions

48
9 Start-up
Start the water heater
1. Read and follow the Operating instructions in FIG.’s 9-2 and
9-3, pages 49 and 50.
If water heater does not start correctly
1. Check for loose connections, blown fuse or service switch
off.
2. Is external limit control (if used) open? Is water temperature
above 200°F?
3. Is tank set point set below tank temperature?
4. Is gas turned on at meter and water heater?
5. Is incoming gas pressure less than 4 inches w.c.?
If none of the above corrects the problem, refer to the
Troubleshooting section of this manual.
Check system and water heater
 Check water piping
1. Check system piping for leaks. If found, shut down the water
heater and repair immediately.
2. Check Delta T. Ensure Delta T is less than 25°F, if not,
reference Section 12 - Troubleshooting.
3. Vent any remaining air from the system using manual vents.
Air in the system will interfere with circulation and cause
hot water distribution problems and noise.
 Check vent piping and air piping
1. Check for gastight seal at every connection, seam of air
piping, and vent piping.
Venting system must be sealed gastight
to prevent flue gas spillage and carbon
monoxide emissions, which will result in
severe personal injury or death.
 Check gas piping
1. Check around the water heater for gas odor following
the procedure on page 39 of this manual (Connecting Gas
Supply Piping).
If you discover evidence of any gas leak,
shut down the water heater at once. Find
the leak source with a bubble test and repair
immediately. Do not start the water heater
again until corrected. Failure to comply
could result in severe personal injury, death,
or substantial property damage.
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. Press ENTER plus the UP button for five (5) seconds to
enter Service Mode.
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 9A. 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.
 WARNING
 WARNING
Table 9A Flue Products Chart
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
Natural Gas Propane
CO
2
O
2
CO
2
O
2
8.0% - 10% 3.0% - 6.5% 9.0% - 11% 4.1% - 6.9%
Installation & Service Manual