Prior To Start-Up; Pre-Ignition Checks; Test Ignition Safety Shutoff; Commissioning - Rheem 199,000 Btu/hr User Manual

DANGER
- Fill trap with water before
unit is first fired to prevent
exhaust fumes from entering
room. Never operate the unit
unless the trap is filled 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.
3-2 3-2
TANKLESS WATER HEATER 199 TANKLESS WATER HEATER 199

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. Confirm that any common venting system at the installation site is
isolated and independent of the unit, that any holes left from removal of a
previous unit have been sealed, and that any resizing of the old flue has
been done.
Confirm that the pressure relief valve is installed and discharge line is directed
2.
downward to a safe point of discharge
Check to see that adequate gas pressure is present at the inlet gas supply
3.
test port. With the unit gas valve shut off, using a Torx 15 screwdriver, open
the test port by turning 1 full turn counterclockwise. Connect a manometer
and open the manual gas valve. Requirements are minimum 4" w.c. and
maximum 14" w.c. Check that there are no gas leaks. maximum 14" w.c
Perform a final check of electrical wiring and provide power to the unit to
4.
initialize operation.

3.2.2 Test Ignition Safety Shutoff

With the unit in operation, test the ignition system safety shutoff device by
shutting off 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, press the Reset button.

3.3 COMMISSIONING

The Tankless Water Heater is factory calibrated to operate with natural gas at
sea level. High Fire combustion is set by the orifice installed and is not field
adjustable. A low calorific value natural gas orifice (See Table 10) is available for
locations where the natural gas calorific value falls below the expected range of
950-1100 BTU/Ft3. Consult your local fuel provider for your fuel's calorific value.
Low fire is field adjustable via the low fire adjustment on the gas valve but must
be done with caution. No mixture adjustment may be performed unless done by
a qualified technician using a properly functioning and calibrated combustion
analyzer.
This unit can burn either natural gas or propane if equipped with the
correct specified orifice. Examine the rating plate of the unit to ensure it
is configured 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 NATURAL GAS
TO PROPANE
199,000 Btu/hr P-081014
Table 10: Fuel conversion kits
The gas valve will automatically de-rate the maximum input by approximately 2%
per 1,000' above sea level. The gas valve's zero governor will ensure that the
gas-air mixture is not affected at altitude.
PROPANE TO
NATURAL GAS
P-081024
INSTALLATION AND OPERATION INSTRUCTIONS INSTALLATION AND OPERATION INSTRUCTIONS
minimum 4" w.c. and
LOW CALORIFIC
NATURAL GAS
P-081414