Pressure Loss Of The Boiler; Open-Vented System; Sealed Systems; Additional Guidelines For The Domestic And Ch Water - REMEHA Avanta 12v Installation & Service Manual

Pressure Loss Graph
700
600
500
400
300
200
100
0.5 0.6 0.7 0.8 0.9 1
Waterflow [m
fig. 06 Pressure loss graph
Heating vent
Min. 22 mm
Static head
Min. 1 m
Max. 150 mm
fig. 07

Open-Vented system

1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9
3
/h] Recommended T 11
o
T max. 20 C
59970.LT.GB.W7H.003
Min. 450 mm
Feed and
exansion
cistern
Cold feed
Min. 15 mm
Flow
Return
59970.LT.GB.W7H.004
2.3.3

Pressure loss of the boiler

2.3.4 Open-Vented System
The feed and expansion tank must be situated at a minimum
height of 1 metre and a maximum height of 30 metres above
the boiler to provide the correct operating head pressure.
The cold feed must be at least 15 mm and the open vent must
be at least 22 mm. The pipes must rise continuously from the
system. The heating vent must be at least 450 mm above the
water level in the feed and expansion cistern.
The pump should be fitted on the flow pipe from the boiler
and have isolating valves each side.
2
o
C
2.3.5

Sealed systems

If the Avanta is installed on a sealed system, an appropriately
sized expansion vessel and a safety valve MUST be installed
close to the inlet side of the pump. A mains filling loop MUST
be installed close to the outlet side of the system pump, along
with automatic air vents positioned in the system pipe work to
ensure adequate system venting during filling and operation.
An adequate pressure gauge should be fitted in a position
where it can be seen during filling of the system.
All in accordance with the current issue of the relevant British
Standards.
2.3.6

Additional guidelines for the domestic and CH water

• Flush the pipes and radiators thoroughly before connecting
the boiler to the central heating system in accordance with
BS 7593 (1992).

• The temperature of the central heating pipes and the
radiators can rise to 95°C.
• Use untreated tap water only to fill the CH system.
• The pH value of the system water must be between 6 and 9
• In case inhibitors are being used, please follow the
instructions given in, see par. 2.3.7.
10
Remeha Avanta