Cuenod NC4 Notice D'emploi page 45

Start up
NC4/6 GX107/8
Important
All measurements are to be performed
using precision pressure gauges.
106 "External filter"
119 Pressure take-off
F4 Pressure switch
Y15 Safety valve
Y13 Main valve
104/C Pressure controller (locked)
103.1/D Diaphragm
Diaphragm 103.1/D
Purpose
The diaphragm and controller work
together. From a pre-set pressure set
by the controller, the metal diaphragm
produces a variable loss of head, by
acting on the screw D, which in turn
affects downstream pressure on
119 pBr. This is the only means of
adjusting the burner.
Controller 104/C
Purpose
This device sets the pressure admitted
into the diaphragm.
The factory setting is suitable for the
widest possible range of applications.
Nevertheless, should the setting be
occasionally lost, follow the procedure
described below:
Setting
· Turn screw D (left-hand pitch) fully
counterclockwise (+), to open
completely the diaphragm and this
way to bypass the device.
· Remove the cap from the screw C.
Gas pressure switch F4
Purpose
This device controls the minimum
distribution pressure (see table).
This step is performed after setting the
required power rating.
Adjustment
· Remove the cover.
To increase factory-set pressure:
· Turn screw E clockwise (+) and vice
versa.
Each turn alters the pressure value
by approximately 40daPa.
Allow for the differential (15 to
25daPa).
01/2005 - Art. Nr. 13 010 553B
Setting
Screw D operates the diaphragm and
sets the burner head pressure 119pBr,
thus the output.
· Use a 2.5mm Allen key to make
adjustments.The screw has a travel
of thirty turns, among which the first
eight have no influence from the
stop (—) upwards.
To increase flow:
· Turn screw D counterclockwise (+)
(left-handed pitch) and vice versa.
· Check for leaks on 119 and 119 pBr.
Use a 2.5mm Allen key. The screw has
a travel of 40 turns. Restore at point
119 pBr the factory setting of 70daPa.
To increase pressure:
· Turn screw C clockwise (+) and vice
versa.
Each turn alters the pressure value
by approximately 13daPa.
· Then adjust the diagram 103.1/D
according to the required output
power (see table).
· Check for leaks on 119 and 119 pBr.
p p
n min
20 17
25 20
37 25
EN
45