Lennox FLEXY II Series Installation, Operating And Maintenance page 67

HEATING : MODULATING GAS BURNER 180 & 240kW
- Check the 230V supply v oltage of electronic boards: the
phase on terminal 01 and the neutral conductor on
terminal 02
- Check the wiring of the signal 0-10V between terminal 64
(polarity 01 of the 24V) and terminal 66 (+ coming from the
actuator)
- Check the connection of the modulating solenoid valv e
between the electronic board's terminals 61 & 62
- Select the operating mode n°3 "output
0-330mA":
The minimum pressure setting must first
be adjusted to ensure that burner will
saf ety light up, then maximum pressure
setting can be adjusted.
Any adjustment of the minimum pressure
inf luences the maximum pressure setting.
Any adjustment must be done with f lat
spanners.
Adjustment of the W4115D1024 board's potentiometer:
- Connect the Multimeter with Micro-
Amps scale in serial with the
MODUREG.
potentiometer, until
maximum current is obtained: here, to reach 8.0mbar, we
must apply 105mA, according to the curve below.
IOM – FLEXY II – 1007 – E

Switch n°1  ON

Switch n°2  OFF
- To prev ent
hysteresis, place
the
potentiometer
called "current"
on position Min.
- Increase the
current by
turning this
the desired
Adjusting minimum pressure setting:
- Disconnect electrical connection to MODUREG
(=modulating solenoid valv e)
- Regulate the v alue of the minimum f low at 2.2mbar (f or
natural gas and at 3.0 mbar for Groningen gas) by turning
the adjusting nut "Maximum pressure".
Adjusting maximum pressure
setting:
- By Pushing the shaft gently
downwards to the maximum
adjustment screw, y ou'll see an approximate value of the
maximum pressure
- Reconnect the electrical
connection to MODUREG
- Regulate the v alue of the
maximum flow at 8.0mbar (for natural gas and at 10.4mbar
f or Groningen gas) by turning the potentiometer called
"current", until the desired maximum pressure.
When maximum and minimum pressures are set wire the
v alve in the circuit.
- Now, check the good reaction of the assembly,
MODUREG + electronic board, by apply ing 2 V to its input
(=climatic 50 output); it must reach the minimum pressure
(2.2mbar for natural gas)
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