Floscan 5A20-20A-1 AccuTroll & CruiseMaster - Manual (Page 17)

5/19/2004 4001-213-00C
FloScan Instrument Co., Inc. Tel: (206) 524-6625 Fax: (206) 523-4961
COMMON ACCUTROLL & CRUISEMASTER SYSTEM QUESTIONS
1. How is the 5400(0)/5500(0)//56100, twin engine system wired so that either engine will power the meter.
Use two diodes, (1N4005) and wire as per the sketch below.
PORT flow sensor
PORT key switch
Cruisemaster
RED wire to
1N4005
1N4005
STBD key switch
STBD flow sensor
2. What type of switch is used for the PORT/STBD select switch?
A single pole single throw (SPST) On/Off switch. When the switch is turned OFF, the needle shows the Port engine consumption.
When turned on, the needle shows Starboard engine consumption.
3. How do I reset the totalizer?
Totalizer memory is powered through the Green wire. If Green wire power is interrupted for 10-15 seconds the totalizer resets to zero.
Memory is retained as long as 9-15 VDC is maintained between the GREEN and BLACK meter wires.
4. Will, “Pegging” the GPH meter needle hurt the instrument? Will the totalizer record accurately with the needle pegged?
When “Pegged” the needle rests harmlessly against a mechanical stop while the totalizer continues to accurately record consumption.
5. What causes needle fluctuations?
Fluctuating readings are usually caused by one of the following:
• Air bubbles passing through the flow sensor.
• Fuel pump pulsations, (Do not install the flow sensor closer than 12” to the fuel pump).
• A Sticky or misadjusted carburetor float valve.
• A 4 sided, “square” float valve, (installing and properly adjusting a three, (3) sided triangular float valve corrects this problem).
• A sticking or chattering anti-siphon valve.
NOTE: Sticking float and anti-siphon valves do not affect system accuracy.
6. Does it make any difference which way the flow sensor(s) are mounted?
YES. There is only one way to install the sensors. Flow sensor(s) must be installed with the fuel flow and orientation arrows pointed
in the right direction for the system to work properly.
7. Will the flow sensor cause fuel starvation?
No, the flow sensors will not cause fuel starvation. Anything put into a fuel line does however have a certain pressure drop across it.
Everything in the fuel line combines to form the systems total pressure drop. If this is more than the fuel pump can tolerate, you must
find a way to reduce the total pressure drop or fuel starvation will occur at higher engine RPM.
8. Will the flow sensor shut off fuel to the engine if it stops working?
FloScan flow sensors are of a FAIL SAFE design. A failure will not restrict fuel flow to the engine, nor will the sensors’ pressure drop
increase even if the rotor stops turning.
3016 NE Blakeley Street, Seattle, WA 98105 Email: [email protected] Http://www.floscan.com