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Konus Burners, Primary, and Vat Pumps

In the emergency mode of operation, the No. AV3 solenoid
de-energizes. The spring inside the pilot head will then force the
stem toward the valve, shifting it to the closed position. Flow from the
operating vat pump will then be ported through the No. 3WV valve
then to the Konus burner. AV3 is a normally closed, two position,
three way, single solenoid, spring return, directional valve.

AV4 Air Pilot Valve

During normal operation of the system, the solenoid on this valve is
energized. The pilot spool will then shift, directing pilot pressure to
shift the EV2 two-way valve to the closed position. This blocks flow
from the Konus burner to the suction port of the operating vat pump.

In the emergency mode of operation, the air pilot valve solenoid
de-energizes. Air pressure in the pilot chamber is then directed to the
atmosphere. The spring in the pilot head will shift the EV2 valve to
the open position. A flow path is now created from the Konus burner
through the valve and to the inlet of the operating vat pump. The oil is
then ported through the HE heat exchanger located in the log ponds.
The heat is dissipated to the ponds in this mode. The flow is then
ported through the No. 3WV valve and back to the Konus burner.
AV4 is a normally closed, two position, three way, single solenoid,
spring return, directional valve.

AV5 Air Pilot Valve

During normal operation of the system, the solenoid on this valve is
energized. The pilot spool will then shift, directing pilot pressure to
shift the EV1 two-way valve to the closed position. This blocks flow
from the Konus burner to the suction port of the operating vat pump.

In the emergency mode of operation, the air pilot valve solenoid
de-energizes. Air pressure in the pilot chamber is then directed to the
atmosphere. The spring in the pilot head will shift the EV1 valve to
the open position. A flow path is now created from the Konus burner
through the valve and to the inlet of the operating vat pump. The oil is

Page 2 Troubleshooting Thermal Oil Systems