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 FORAT 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 CALLA 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
T = 18.9 seconds | 3600 X 1050 = 199,900 Btuh (59 kW) |
| |
H = 1050 Btu/ft.3 | 18.9 |
|
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.
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