Navien LST-58K, Instruction Manual

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air vent work (the single piping system)
1. Loosen the air vent screw on the upper side of the oil filter using a Philips head
screwdriver. After air vent is completed and oil is discharged, tighten the air vent screw.
(This method is feasible only when the oil tank is placed above the oil filter.)
2. As the air is not sufficiently vented when the oil tank is placed below the oil filter, loosen
the air vent bolt on the gear pump and turn the boiler power on. When the gear pump
starts operation, the air will be vented. Then, the check lamp on the controller will light,
and the boiler will stop operation.
3. Press the Restart button on the controller to repeat the above operation. Then, the entire
amount of air will be vented and oil will be discharged. Tighten the air vent bolt and press
the Reset button again. The burner will be operating for ignition.
<Gear pump supplied by DANFOSS> <Gear pump supplied by SUNTEC>
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Considerations for the air vent work
In case of the multiple pipe system, the air vent work is not necessary, as the air is
automatically vented toward the return pipe.
Care shall be taken to prevent oil from flowing on the floor during the air vent work.
Do not loosen the air vent bolt of the gear pump fully, as too much oil may flow out
of the bolt hole.
If the air vent bolt is not on the gear pump, loosen the bolt on the return side for air
vent and tighten the bolt immediately after oil starts to be discharged.
Wear gloves to protect your hands from oil.