3-3
STARTUP AND COMMISSIONING
SFT 199 TANKLESS WATER HEATER
To verify the proper operation of the gas valve in the eld, the following procedure
can be carried out by a quali ed technician (see diagrams on this page).
1. Turn off the unit’s manual gas valve. With a Torx 15 screwdriver, open
the inlet gas supply pressure test port by turning its screw 1 full turn
counterclockwise. Attach a manometer to the pressure test port. Turn on
gas to the appliance. Static manometer reading should be ideally 7” w.c.,
for natural gas and 11” w.c. for propane. Minimum and maximum static
pressure must be between 5” and 14” w.c. Monitor pressure throughout the
commissioning procedure. Pressure may droop up to 1” at high re.
2. Allow the unit to ignite / run against a large load, to maintain high re. To set
the high- re manually, press and hold the Service icon for two seconds. Then
while holding the Service icon press the Plus
button twice. “H” will show
in the service display as the unit enters high re.
NOTE: Allow the unit to operate at high re for 3 minutes to stabilize. (The
unit operates in manual mode for 10 minutes then switches back to the
normal operating mode. To extend manual mode operation, press the Service
and Plus together twice while the unit is operating in manual mode
to reset the timer for 10 more minutes.) Do not make adjustments if the
service display shows an “h”.
3. Clock the gas meter to con rm full maximum rating plate input. With a
combustion analyzer probe in the ue gas test port, check the measured
results against Table 12 - High Fire. If the results are outside the permitted
range, check the inlet pressure, and con rm that the correct ori ce and
venturi are installed. For areas of lower calori c value natural gas, install the
alternative ori ce listed on page 3-4.
4. Switch the unit to low re by pressing the Service button and Minus
-
buttons
at the same time. The unit will drop to low re. “L” will show on the service
display. Compare the readings with Table 12 - Low Fire. If adjustment is
necessary, remove the low re adjustment cap to reveal a Torx head screw.
Make minimal adjustments, typically less than 1/8th of a turn at a time. Turn
the screw clockwise to increase CO
2
and counter-clockwise to reduce CO
2
.
If the target cannot be met, even after a full turn, contact the factory. When
nished, replace the low re cap, and leave the manual mode by pressing +
AND - simultaneously.
5. Switch off the unit by pressing the space above the white dot for two
seconds. Turn off the gas at the unit’s manual gas valve. Remove the ue
gas analyzer from the test port and reinstall the test port cap. Remove the
gas pressure manometer from the gas valve and fully close the test port.
Turn on the gas at the manual gas valve. Ensure that there are no gas leaks
and reinstall the front cover. Turn on the unit by pressing the space above the
dot for two seconds.
Figure 26 Gas Valve Adjust
Figure 27: Flue gas test port plug
WARNING
Check the rating plate of the
unit to ensure it is con gured
for the fuel you are using. If
the fuel is incorrect for the
appliance, a conversion kit
must be ordered from IBC
and the gas valve adjusted
accordingly.
Failure to perform the
required fuel conversion can
result in an immediate hazard.
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