Ferroli OPTIMAX 25 OV Instructions For Use, Installation And Maintenance page 11

Wall-mounting, pre-mixed condensing gas boiler
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Optimax 25 OV
The connecting kits shown in fi g. 4 are supplied as standard.
fi g. 4
Make Up Water
This appliance is designed to work on an open vented fully pumped heating system only, (see fi g 5 page
12). The make up of water must be made via a suitably sized cold feed and expansion tank installed to
the current regulations.
This appliance is not suitable for gravity type installations or primatic type cylinders only indirect ones
should be used.
The system must be fully pumped due to the complex design of the Alluminium Laminar heat exchang-
ers high effi ciency design.
Attention - is drawn to the Model Water Byelaws.
Fittings manufactured from duplex (alpha-beta) brass are not acceptable for underground use and certain
water undertakings will not accept their use above ground.
A
B
C
B
A
22
mm
X2
Key
A = Nut
B = Compression olive
C = Nipple
F = 1/2 gas seal - Blue
F
A
B
Gas isolation valve
22
mm
X1
Appliance
drain OFF valve
11

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