
38
CAHA Midi
Installation, Usage and Maintenance Instructions
6.7 PNEUMATIC CONNECTIONS
A pneumatic diagram for the CAHA Midi 340 (5 sections) and the CAHA Midi 510 (7 sections) is given in the figure below.
A pneumatic diagram for the CAHA Midi 425 (6 sections) and the CAHA Midi 600 (8 sections) is given in the figure below.
The siphon pressure switch, connected to the sump (P1), prevents overflow of the syphon in the case of excess back pres-
sure in the flue.
The air pressure switch, (P1 and P2), connected to the venturi, checks the amount of air (by means of a Δp measurement)
before startup.
6.8 PC-CONNECTION
For information regarding connection of a PC to the boiler please contact your supplier.
P1
P2
P1
P2
P2
P1
P1
Venturi
Sump
SPS
Syphon Pressure Switch
Gas valve
APS
Air Pressure Switch
Air inlet
Restric
�
on 90 mm
P1
P2
P1
P2
P2
P1
P1
Venturi
Sump
SPS
Syphon Pressure Switch
Gas valve
APS
Air Pressure Switch
Air inlet