11
Test Operation
Preparing
１
)
Confirm that all gas cocks are closed.
２
)
Check the gas piping for leak with air or nitrogen gas.
３
)
Confirm that all instruments in each line of air and gas can operate normally.
４
)
Confirm that gas is in supply under the specified pressure and that the inside of the
piping is being substituted.
５
)
Start the blower, and confirm that the pressure at the outlet is as specified.
６
)
Set the burner air pressure to 2.5kPa by using the air butterfly damper.
７
)
Supply high-pressure air and power to the selector valve actuator and the 3-port valve for assist air,
and set the switching time to 15 sec.
Igniting
１
)
Confirm that the cock, solenoid valve and limiting valve in front of the burner are fully
closed...
２
)
Fully open the pilot air cock, and adjust the regulating valve to set the pressure to 2kPa.
３
)
Measure the flow rate of the pilot air with the orifice flow meter.
４
)
Fully open the pilot gas cock, press the ignition button and ignite the pilot gas while
gradually opening the gas regulating valve.
５
)
After the ignition is achieved, calculate the gas flow rate from the air flow rate to make
the excess air ratio to 1.1, obtain the differential pressure of the orifice flow meter and
set the gas regulating valve to the differential pressure. At this time, be sure to convert
the specific gravity of the gas body.
６
)
Confirm the ignition behavior 2 or 3 times. Also, confirm the value of the flame detector.
７
)
Confirm that the solenoid valve of the main gas is open. Then, ignite the main burner
while gradually opening the limiting valve.
Adjusting
１
)
Set the excess air ration to approx. 1.6, and raise the temperature to the working
temperature. (Measure the flow rate with the air and gas orifice flow meters, and set
the flow rate accordingly with the limiting valve. As the furnace temperature rises, the
excess air ratio lowers.)
２
)
When the temperature rises to near the operating temperature, adjust the excess air ratio to approx.
1.3. At the temperature near the operating temperature, set the burner pressure to 4 kPa (CRU-10) or
5kPa (CRU-20).
３
)
To measure the gas flow rate with the orifice flow rate in the same way as the
measurement of the pilot gas flow rate, convert the specific gravity of the gas body.
Summary of Contents for HOPE CRU-10
Page 11: ...10 Flow sheet...
Page 18: ...17 Structural drawing...
