User manual

2 Checking piping and electrical installation

2.1 Checking the piping installation

Before filling the heating system, check the piping installation according to the checklist below.

For further information, also see the Installation Quick Guide.

Piping checklist OK Not OK

Are the pipe connections in accordance with the connection diagram.

Are the flexible hoses on the supply and return lines installed on the outdoor unit?

Is the strainer on return line mounted? See figure 1

Is an expansion vessel installed?

Is a valve-pipe with safety valve and manometer installed?

Is a volume tank installed? See Volume tank table below

Is a filler cock with non-return valve heating system installed?

Fig. 1: Strainer

A: Stopcock

B: Cover

C: Strainer

D: O-ring

Warning

In order to secure the defrosting of the outdoor unit, a minimum amount of water must be contained in the

heating system. This is shown in the table below.

If the heating system itself holds the amount of water described in the table, a volume tank is not needed, but recommended.

Volume tank table Unit 6 kW 9 kW 11 kW 13 kW 16 kW 18 kW

Min water volume in heating system. DHP-AQ Mini and

DHP-AQ Midi

l 120 180 220 260 320 360

Min water volume in heating system. DHP-AQ Maxi l 60 90 110 130 160 180

If the amount of water in the heating system is not sufficient, Low Pressure alarms may occur.

For DHP-AQ Maxi, also check:

Water heater checklist OK Not OK

Bleed valve installed

For DHP-AQ Mini, also check:

External Water heater checklist OK Not OK

Exchange valve installed (factory installed in DHP-AQ Midi and DHP-AQ Maxi)

Commissioning

VIGFH102 Danfoss Heating Solutions