Viking Pump UDF400: DFO Start-UP Guide - Manual (Page 8)

Viking Duplex Fuel Oil Package
Field Start-Up Guide
Bulletin:
Issue:
Page:
UDF400
2-Oct-06
7
PRESSURE SWITCHES
If the duplex unit is supplied with pressure switches (either single or dual stage) they will be installed on
the discharge line. The pressure setting will be factory set, but they are field adjustable.
To simulate a low pressure condition on the discharge line, have the control panel on automatic mode
and then close the discharge valve of the pump running. The relief valve will open and the pumping liquid
will return to the supply tank. The pump will shut down and a red light will come on the panel, the time will
be that is set on the timer.
It is difficult to simulate an actual high pressure shut down. Have the electrician simulate by open or
closing the contacts in the control panel.
Field adjustment of the pressure setting can be done by the following:
Single Stage Pressure Switch – Square D – 9012-GNG2
ƒ See UDF400-1 Single Stage Pressure Switch.pdf
Dual Stage Pressure Switch – ASCO – SC10D-TG10A21
ƒ See UDF400-2 Dual Stage Pressure Switch.pdf
FLOW SWITCHES
If the duplex unit is supplied with a flow switch it will be installed on the discharge line. To simulate a low
flow condition on the discharge line, have the control panel on automatic mode and then close the
discharge valve of the pump running (either P1 or P2). The relief valve will open and the pumping liquid
will return to the supply tank. Within a few minutes (usually 1 to 3 minutes) based on the time set on the
timer, the control panel will start the other pump and the “Low Flow” Signal red lights (optional equipment
required for installation of low flow switch) will light up on the panel.
VIKING PUMP, INC. • A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA
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