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necessary to follow the suppliers instructions regarding the
adjustment of the concerned control. It deals with the
switching from modulating mode to fixed setting mode which
is in most cases is a potentiometer.
The fixed setting mode is very often used for central heating,
where on/off adjustable pressure to burner is required.
This intermediate outlet pressure can in general be
electrically set as follows:
• Disconnect pressure feedback connection (if applicable).
• Connect a suitable pressure gauge to pipe line or to outlet
pressure tap of gas control concerned, to measure burner
pressure (measuring point must be as near to burner as
possible).
• Energize operator, set control in operation and wait until
an outlet pressure is recorded on pressure gauge.
• Make sure Moduplus® is wired in the circuit.
• Start system in fixed setting mode.
• Adjust current as low as needed to obtain the lowest
pressure by using pressure setting means of control.
A Cap
B Adjustment screw (5 mm) for minimum pressure setting
C Adjustment screw (8 mm) for maximum pressure setting
D 2.8 mm AMP terminals
E Pressure feedback connection
140
105*
Fig. 2. Dimensions CVI with Moduplus®
Mechanical setting of Moduplus® will prevent too low
setting.
• Close pressure tap screw
• Increase the current until desired pressure is obtained by
using pressure setting means of modulating control.
• Mount cap and reconnect pressure feedback connection
(if applicable).
Checkout
After any adjustment, set appliance in operation and observe
through a complete cycle to ensure that burner system
components function correctly.
Maintenance
It is recommended to check yearly the minimum and the
maximum setting and readjust them if necessary.
A
B
C
D
38
Fig. 1.
135
3
82
E
140
EN1R-9175 0908RA-NE
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