Test method
Step 1
1. Detach the 1- and 2-stage capacity valve outputs and electrical terminals.
If needed, mark the valves with conductors to facilitate reconnecting of them.
2. Place the drainage container under the valve outputs.
Step 2
1. Detach the flame detector terminal (X20) from the control unit and install the permanent loop to the
terminal according to the figure below.
2. Start the burner and wait until the ignition phase after the pre-purge phase begins (factory setting 30
s). When the ignition phase has begun, install the flame detector terminal back to the control unit.
3. Short out the control unit terminal (X20) pins within the safety time (5 s) by installing the terminal
(X20) equipped with the permanent loop to its place to form an artificial flame signal.
4. Oil may drip for approx. 30 seconds.
If the dripping continues, change valves.
Step 3
End testing by turning the control switch S1 off from the “fire” position or by removing the connection that
creates the artificial flame signal.
Step 4
1. Disassemble the test arrangement by connecting the flame detector terminal (X20) back to the control
unit.
2. Connect the oil valve pipes and electrical terminals back to their places.
3. Make sure that the valves are correctly connected.
4. Connect the ignition transformer secondary cable.
Servomotors
During burner start-up the burner control drives the servomotors to maximum position
and during shutdown to 0-position. The burner control supervises the correlation of the
position settings and back coupling.
During burner shutdown, check the air damper and the locking screws of the fuel
adjusting valve. Push air damper lightly to make sure they are firmly attached.
O
2
/CO trim control (if equipped)
● The system is self-checking during start-up.
● Confirm proper fuel/air ratio with flue gas analysis.
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Summary of Contents for GKP-50 MH
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