INSTALLATION AND OPERATION INSTRUCTIONS
3-2
SFT 199 TANKLESS WATER HEATER
INSTALLATION AND OPERATION INSTRUCTIONS
3-2
SFT 199 TANKLESS WATER HEATER
3.2 PRIOR TO START-UP
3.2.1 Pre-Ignition Checks
1.
Fill the condensation trap. Ensure the venting system is complete and seal-
tested. Confi rm that any common venting system at the installation site is
isolated and independent of the SFT unit, that any holes left from removal of
a previous unit have been sealed, and that any resizing of the old fl ue has
been done.
2.
Check that the water piping system is fully fl ushed and charged, and that all
air has been discharged. Confi rm that the pressure relief valve is installed and
safely drained.
3.
Check to see that adequate gas pressure is present at the inlet gas supply
test port. With the manual gas valve, using a Torx 15 screwdriver, open the
test port by turning its center-screw 1 full turn counterclockwise. Connect a
manometer and open the manual gas valve. Requirements are minimum 5"
w.c. and maximum 14" w.c. Check that there are no gas leaks.
4.
Perform a fi nal check of electrical wiring and provide power to the unit to
initialize operation.
3.2.2 Test Ignition Safety Shutoff
With the unit in operation, test the ignition system safety shutoff device by
shutting the manual gas valve immediately outside the unit case. Ensure that the
unit has shut off and that the appropriate error information is displayed on the
main display screen. To restart the unit, reset the power.
3.3 COMMISSIONING
The SFT water heaters are factory calibrated to operate with natural gas at sea
level. High Fire adjustment is only required if the calorifi c value of the fuel is
out of the normally expected range of (NG range 900-1100 Btu/ft
3
). Consult
your local fuel provider for your fuel’s calorifi c value. Low fi re is fi eld adjustable,
but must be done with caution. No mixture adjustment may be performed
unless done by a qualifi ed technician using properly functioning and calibrated
combustion analyzing equipment.
This unit model can burn either natural gas or propane if equipped with the
correct specifi ed orifi ce. Examine the rating plate of the unit to ensure it
is confi gured for the fuel you are using. If the unit is to be converted from
natural gas to propane or from propane to natural gas a fuel conversion kit
must be installed. For the correct fuel conversion kit part number, see the
table below:
MODEL NUMBER
NATURAL GAS
TO PROPANE
PROPANE TO
NATURAL GAS
SFT-199
P-802
P-803
Table 11: Fuel conversion kits
The gas valve will automatically de-rate the maximum input in accordance with
the density altitude, by approximately 2% per 1,000’ above sea level. The gas
valve’s zero governor will ensure that the gas-air mixture is not be affected at
altitude.
DANGERS
- Fill trap with water before
unit is fi rst fi red to prevent
exhaust fumes from entering
room. Never operate the unit
unless the trap is fi lled with
water.
Failure to comply will result
in severe personal injury or
death.
- It is forbidden to make
adjustments to the gas
valve except with a properly
calibrated gas combustion
analyzer by persons who
are trained and experienced
in its use. Failure to use an
analyzer can result in an
immediate hazard.
ALTERNATIVE
NATURAL GAS ORIFICES
FOR CALORIFIC VALUES
750–900 BTU/FT
3
MODEL
NUMBER
ORIFICE
SIZE
SFT-199
725 (P-840)
