NOTE:
1.Remove main burners from unit.
2.Check that burner venturi and ports are free of foreign debris.
3.Clean burners with bristle brush and/or vacuum cleaner - DO NOT distort burner ports or pilot location.
4.Reinstall burners in unit. Make sure front and rear of burners are installed correctly in burner support brackets.
Also check for good flow of combustion and ventilating air to the unit. Maintain a clear area around the heater at all times.
GAS VALVES
Figure 14 shows the type of combination manual gas control valve and regulator used on these heaters.
If the gas valve becomes defective, repairs should not be attempted. A new valve should be installed in place of the defective one.
FIGURE 14
CHECKING THE INPUT
For appliance installation locations with elevations above 2000 feet, refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.
1.Attach a pressure gauge or a manometer to the gauge port and refer to Table 4, for correct manifold pressure.
2.Use this formula to “clock” the meter. Be sure that other gas consuming appliances are not operating during this interval.
3600 X H = Btuh
T
T = Time in seconds to burn one cubic foot of gas. H = Btu’s per cubic foot of gas.
Btuh = Actual heater input.
Example: (Using
H = 1050 Btu Btuh = ?
36.8 X 1050 = 250,000 Btuh (Compare with the BTI 250 model and rating.)
Should it be necessary to adjust the gas pressure to the burners to obtain the full input rate, the steps below should be followed:
3.Remove the regulator adjustment sealing cap, fig. 14, and adjust the pressure by turning the adjusting screw with a screwdriver.
Clockwise to increase gas pressure and input rate.
Counterclockwise to decrease gas pressure and input rate.
4.“Clock” the meter as in step 2 above.
5.Repeat steps 3 and 4 until the specified input rate is achieved.
6.Turn the gas control knob to PILOT. Remove the pressure gauge and replace the sealing cap and the allen wrench set screw in the pressure tap opening.
WARNING
UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT EXCEED THE INPUT SHOWN ON THE HEATER MODEL AND RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER.
When the heater is operating at full capacity, or full gas input, it should consume 1 cu. ft. of gas in time indicated on Table 5.
VENTING SYSTEM
Examine the venting system every six months for obstructions and/or deterioration of the vent piping.
Remove all soot or other obstructions from chimney which will retard free draft.
REMOTE STORAGE TANK
TEMPERATURE CONTROL
The water temperature in the storage tank (if used) is controlled by the storage tank temperature control. The sensing element is mounted in the hot water storage tank, see page 16.
A change in water temperature in the storage tank lower than the tank temperature control setting will cause the sensor to activate the circulating pump. The pump then circulates the water through the heater where the thermostat senses the drop in water temperature and activates main burner operation of the appliance. If the storage tank temperature control is out of calibration, replace with new control.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE.
RELIEF VALVE
At least once a year, the temperature and pressure relief valve should be checked to ensure that it is in operating condition. Lift the lever at the top of the valve several times until the valve seats properly and operates freely.
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