Nibe AHP S300, Installer Manual

Page: 11 / 28

General
Pipe installation must be carried out in accordance with
current norms and directives.
The accumulator tank must be fitted with the requisite
valves, such as a safety valve, shut-off valve and non-
return valve. An overflow pipe should be routed from
the safety valve to an appropriate drain. The overflow
pipe must be the same size as the safety valve. Route
the overflow pipe from the safety valve, sloping along
its entire length, and ensure that it is frost-proof and
well supported. The mouth of the overflow pipe must
be visible and not placed close to electrical components.
Ensure that incoming water is clean. When using a
private well, it may be necessary to supplement with
an extra water filter.
If uncertain, contact a plumber alternatively see applic-
able standards.
MAXIMUM BOILER AND RADIATOR
VOLUMES
For installation in pressurised systems, the system must
be equipped with a pressure expansion vessel pre-
pressurised to 0.5 bar .
Internal volume in AHP S/ AHPS S/ AHPH S for calculat-
ing expansion vessel is 270 l. The expansion vessel's
volume must be at least 10% of the system's total
volume.
Example table:
Volume (l) expansion vessel Total volume (l) (accumulator
tank and radiator system)
50 500
70 700
100 1000
Caution
Expansion vessel not supplied with the
product.
The pre-pressure of the pressure expansion vessel must
be dimensioned according to the maximum height (H)
between the vessel and the highest positioned radiator.
A pre-pressure of 0.5 bar means a maximum permitted
height difference of 5 m.
If the pre-pressure in the pressure vessel is not high
enough, it can be increased by adding air via the valve
in the expansion vessel. The expansion vessel's pre-
pressure must be entered in the check list on
page 6 .
Any change in the pre-pressure affects the ability of the
expansion vessel to handle the expansion of the water.
11 Chapter 4 | Pipe connections AHP S/ AHPS S/ AHPH S
4 Pipe connections