Installation 4; Preparing The Installation; Technical Instructions For The Heating System; Direct Feeding With Heating Pump Located In The Interior Of The Device - Vaillant ecoMAX 646 Installation And Maintenance Manual

4 Installation
When installing, please observe the following points in
particular:
- Install the filling device in the return
- Guarantee minimum circulation by means of an over-
flow valve or hydraulic switch
When recharging:
- Install the storage charging pump
- Install gravity brake in the heating supply and in the
storage charging circuit
4.1

Preparing the installation

Safety equipment for an emergency
• From the safety valve's blow-out line, a drain pipe with
intake guide and siphon must be led to a suitable out-
let. The outlet must be visible!
• If plastic pipes are used in the heating system, a suita-
ble maximum thermostat must be mounted on the
heating supply (e.g. Vaillant feed thermostat 009 642).
This is necessary in order to protect the heating sys-
tem from temperature-related damage in the event of
a malfunction.
• When using plastic pipes that are not diffusion tight in
the heating system, a system separation between the
heater and system by means of an external heat ex-
changer must be performed in order to avoid corrosion
occurring in the heater circuit or in the boiler.
4.2

Technical instructions for the heating system

Caution!
The following system diagrams are schematic
diagrams. They do not replace the full profes-
sional diagrams!
The system diagrams do not contain the shut-
off devices and safety devices necessary for
correct mounting.
Observe the applicable standards and guidelines.
Installation and maintenance manual ecoMAX 646
4.2.1 Direct feeding with heating pump located in
the interior of the device
1
3
3
230V~
3
53
Fig. 4.1 Example 1: radiator heating, direct feeding, appliance-
internal pump
1 ecoMAX 646
2 heating pump
53 overflow valve (on site)
Pump layout; system dimensioning
The system planning is to be done such that in the de-
sign point optimally a water volume of:
V = 2000 l/h with T = 20 K
flows through the device and system.
The resulting residual delivery head for the system di-
mensioning is to be taken from fig. 4.2.
Setting the overflow valve
In order to guarantee the minimum circulating water vol-
ume of 1150 l/h through the appliance, install and set the
overflow valve.
We recommend you set the overflow valve to 250 mbar
with regard to possible noises at thermostat valves. The
overflow valve can, however, be set at up to 400 mbar.
Druck in mbar
900
850
Restförderhöhe ohne Schwerkraftbremse
800
750
700
650
600
550
500
450
400
350
300
Restförderhöhe mit Schwerkraftbremse
250 (Zubehör, Art.-Nr. 306 715)
200
150
100
50
0
0 200 400 600 800
Fig. 4.2 Resulting characteristic curve (residual delivery head)
ecoMAX 646

Installation 4

2
Nennpunkt
1000 1200 1400 1600 1800 2000
Volumenstrom in l/h
2200
11