15
Sookook Corporation
PART Ⅱ : OPERATION MANUAL
2A. Preparation for Commissioning
Air Purge (Gas Purge in Gas Piping)
Initially, the gas piping contains air, so the air purge (gas purge) is required to fill the pipeline with gas before the ignition. The air purge is the
responsibility of the city gas company or plumbing contractor, but if it is not confirmed, a user shall conduct the air purge before operating
the burner.
If there is a purge cock, open the purge cock and vent it out until gas is detected. Once you confirm that the gas has been completely
substituted, lock the cock or close it completely.
If air purge is complete by using the cock or if the purge cock is not installed, open the manual shutoff valve and loosen the screw on the
pressure release tab of the gas pressure switch to purge the gas inside the pipe from the manual shutoff valve to the safety shutoff valve.
Initial Setting of the Safety Device
Check whether the set pressure of the air pressure switch, gas pressure switch and governor, the angle of low combustion air damper, high
combustion damper limit switch, and ignition flow control lobe (V start) of safety shutoff valve and ignition angle of gas flow control butterfly
valve are in proper position. Then, connect the thermostat contacts to burner terminal 3 and 4 to supply the power.
Motor Rotation Direction Check
For three-phase motors, be sure to check the rotation direction because the motor direction may change each time when the power line is
connected. The rotation direction is counter clockwise when seen from the motor side.
Burner Controller Check
This burner is provided in a package, so all tests are done before shipment. Still, a user shall check again just in case.
Open the gas manual shutoff valve little by little and lock it again when the gas pressure switch contact moves from the low-pressure side
(N.C) to the high-pressure side (N.O).
Operate the burner to check for any failure in the automatic operation sequence (esp. flame detection operation).
If all interlocks are intact, the damper motor starts to rotate toward the open direction and at the same time, one of the two safety shutoff
valves open about 2 to 3 seconds and then closes again. The valve opening can be checked by the indicator lamp on the valve itself. The fan
motor starts when the valve is closed. Until this time, the damper motor continues to operate toward the open direction and stops after a few
seconds.
After the fan conducts purge for more than 30 seconds at the maximum blowing capacity, the damper motor operates toward the close
direction for ignition. A few or dozens of seconds after the damper is closed, the ignition transformer operates and two safety shutoff valves
open simultaneously.
It runs with the gas manual shutoff valve closed, so it does not continue to burn. Soon, the motor stops and goes into stand-by mode or lock-
out mode. If locked out, reset the burner controller to resume operation
Check the pre-purge operation, movement of the pneumatic switch contact point from the low-pressure side to the high-pressure side,
operation of the high voltage transformer, and open/close operation of the safety shutoff valve. Because the gas valve is opened when the gas
transport valve closed, the gas pressure switch contact drops from the high-pressure side to the low-pressure side regardless of the flame
formation, the safety shutoff valve closes, and the blower continues to run and turns into the restart mode. Restart is a function that repeats
from pre-purge to ignition.
To Next Page
Loading...