Wren 44 Kerostart Supplement
Copyright Wren Turbines Ltd 2012. All rights reserved.
Page
10
Problems Checklist:
The usual problems associated with a kerostart installation can
be narrowed to just two key items – the “Pump Start Point” and
the “Pump Power Ignition Kero”. Both of these can be trialled
with the same number and are adjusted to suit each fuel pump
fitted to the system.
A tight or new pump will benefit from some running-in before
fitting and this helps to settle the gears etc. The values may
need to be raised considerably to get the initial settings to get
the pump going. As the fuel pump loosens in service the values
for these functions may then need reducing by a few points to
make a start less aggressive.
We present here some of the usual things encountered in the
hope they clear up any problems you might see.
The checklists are listed in the order in which problems may be
encountered, ie setup and starting.
It is not intended in this supplement to cover normal running
problems as these would already be covered in the respective
operators manuals.
A detailed manual covering all the kerostart functions is
available to download from Xicoy Electronica SL on
www.xicoy.com
Be sure to ask for the V10 kerostart manual (there is a choice of
gas start too).
Symptom
Problem
Action
No reading on ECU
display unit
RX not switched on or RX
battery discharged
Verify connection and charge if
necessary
Display not connected
properly
Ensure that display is plugged in
the correct orientation
Display malfunction
Contact Wren
ECU problem
Contact Wren
Transmitter stick
down/trim up reads
“StickLo”
Throttle channel needs
reversing,
Reverse channel on Tx (most
Futaba’s need this)
Temp’ reading
incorrect or “0”
Thermocouple not connected
to ECU
Verify connection
ECU problem
Contact Wren
Thermocouple failure
Contact Wren
Temp’ reading shows
lower or negative
figure on ignition
Thermocouple plug inserted
wrong way round
Ensure connector matches the
label on the ECU
No rpm indicated
when engine is spun
Rpm sensor plug inserted
incorrectly
Ensure connector matches the
label on the ECU
Rpm sensor lead
broken/chafed
Remove source of chafing and
repair/replace
Rpm sensor malfunction
Contact Wren
ECU problem
Contact Wren
Kerosene does not
ignite
Glow power set too low
Check at least 6.8v in start
menu - Glowpower
Poor glow at igniter
Check connections / earth
Plug partially blown
Replace element
ECU battery low
Charge
Burner fuel too low
Increase burner fuel
(Pump Power Ignition Kero)
Burner valve not operating
Check valve inserted
correctly into ecu
No kerosene ignition
Pump not turning
Check pump for correct
operation (use “TEST/Prime
PUMP” in INFO)
ECU shows
“GlowBad”
Element blown / open circuit
Replace element (call Wren
for service replacement)
