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23
OPERATING INSTRUCTIONS
IMPORTANT
IT IS RECOMMENDED THAT A QUALIFIED SERVICE TECHNICIAN
PERFORM THE INITIAL FIRING OF THE HEATER. AT THIS TIME
THE USER SHOULD ASK THE TECHNICIAN ANY QUESTIONS IN
REGARD TO THE OPERATION AND MAINTENANCE OF THE UNIT.
CAUTION
BEFORE PROCEEDING WITH THE OPERATION OF THE UNIT,
MAKE SURE HEATER AND SYSTEM ARE FILLED WITH WATER
AND ALL AIR IS EXPELLED FROM HEATER AND PIPING.
NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN
IT IS FILLED WITH WATER AND A TEMPERATURE AND A
PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE
OPENING OF THE HEATER. DO NOT ATTEMPT TO OPERATE
HEATER WITH COLD WATER INLET VALVE CLOSED.
FILLING:
1. Close the heater drain valve.
2. Open a nearby hot water faucet to permit the air in the system
to escape.
3. Fully open the cold water inlet pipe valve allowing the heater
and piping to be filled.
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
THE MAIN MANUAL GAS SHUTOFF VALVE MUST HAVE BEEN
CLOSED FOR AT LEAST FIVE (5) MINUTES. THIS WAITING PERIOD
IS AN IMPORTANT SAFETY STEP. ITS PURPOSE IS TO PERMIT
GAS THAT MIGHT HAVE ACCUMULATED IN THE COMBUSTION
CHAMBER TO CLEAR. IF YOU DETECT GAS AT THE END OF
THIS PERIOD, DO NOT PROCEED WITH LIGHTING. RECOGNIZE
THAT GAS ODOR, EVEN IF IT SEEMS WEAK, MAY INDICATE THE
PRESENCE OF ACCUMULATED GAS SOMEPLACE IN THE AREA
WITH A RISK OF FIRE OR EXPLOSION. SEE THE FRONT PAGE
FOR STEPS TO BE TAKEN.
DO NOT USE THIS HEATER IF ANY PART HAS BEEN UNDER
WATER. IMMEDIATELY CALL A QUALIFIED SERVICE TECHNICIAN
TO INSPECT THE HEATER AND TO REPLACE ANY PART OF THE
CONTROL SYSTEM AND ANY GAS CONTROL WHICH HAS
BEEN UNDER WATER.
LIGHT THE UNIT IN ACCORDANCE WITH THE OPERATING
INSTRUCTIONS LABEL ATTACHED TO THE HEATER.
THESE INSTRUCTIONS ARE REPEATED IN THE LIGHTING AND
OPERATING LABEL ILLUSTRATION IN THIS MANUAL.
INITIAL START-UP
A minimum gas supply pressure of 6.2" W.C. for natural gas is
required before making any adjustment to the gas control pressure
regulator. Attempts to adjust the regulator during periods of low
gas supply pressure could result in overfiring of the heater when
the gas supply pressure returns to normal.
1. Check gas line pressure with a manometer.
2. Check manifold pressure (see Table 4) using a pressure gauge
(manometer) connected to the manifold pressure tap on the
gas control valve.
If full rate adjustment is required, remove cover screw from top of
the gas control valve.
Using a small screwdriver, turn adjusting screw clockwise
to
increase or counterclockwise
to decrease gas pressure to
obtain 4.5" (1 kPa) for natural gas Water Column.
3. Cycle the burner on and off several times to check its operation.
4. Check the operation of the limit and operating controls.
5. Check the input rate:
For appliance installation locations with elevations above 2000
feet (610 m) refer to HIGH ALTITUDE INSTALLATIONS section of
this manual.
a. Attach a pressure gauge (manometer) to the manifold
pressure tap and refer to Table 4, page 26 for correct
pressure.
b. Use this formula to “clock” the meter. Be sure other gas
consuming appliances are not operating during this interval.
3600 X H = Btuh
T
Should it be necessary to adjust the gas pressure to the
burner, to obtain the full input rate, the steps below should
be followed:
T = Time in seconds to burn 1 cubic foot of gas. (With a stopwatch
read the gas meter and measure the amount of time required
for the heater to consume 1 cubic foot of gas.)
H = Heating value of gas (in Btu’s per cubic foot of gas).
Btuh = Actual heater input rate, in Btuh.
EXAMPLE: (Using RTF-120 heater)
T = 18.9 seconds
H = 1050 Btu/ft.
3
For high altitude installations, compare result to the derated input
required for the elevation at the installation location.
c. Remove the pressure regulator cover screw and adjust the
pressure by turning the adjusting screw with a small
screwdriver. Do not exceed 4.5" (1 kPa) Water Column.
Clockwise to increase gas pressure and input rate.
Counterclockwise to decrease gas pressure and input
rate.
d. “Clock” the meter as in step (b) above.
3600 X 1050 = 199,900 Btuh (59 kW)
18.9