Hydraulic Decoupling With Heating Pump Located On The Appliance Side; Technical Instructions For Recharging - Vaillant ecoMAX 646 Installation And Maintenance Manual

4 Installation
4.2.2 Hydraulic decoupling with heating pump
located on the appliance side
3
230V~
1
3 3
2
3
3
Fig. 4.3 Example 2: radiator heating and floor heating, hydrau-
lic separation, appliance-internal pump
1 ecoMAX 646
2 heating pump (appliance-internal)
13 weather-based controller VRC 420s
13a mixer module
17a supply temperature sensor
Pump layout in the heater circuit
The appliance pump is set according to table 4.1.
with gravity brake
Pump
100 %
output
Table 4.1: pump output
The pump output must be set to the values in the table
(in the DIA system under point d.14).
Selection of the hydraulic switch
A suitable WH model hydraulic switch (accessory) can be
selected with the aid of table 4.2.
A sufficiently large water volume (minimum circulating
water volume) is constantly supplied through the boiler
via the hydraulic switch in conjunction with the pump
built into the boiler.
heating system output
ecoMAX 646
double cascade
triple cascade
quadruple cascade
Table 4.2: Selection of the hydraulic switch, WH model
12
J
2
3
3
3
4
2
17a
45
without gravity brake
80 %
heating system spread
10 K 15 K 20 K
WH 95 WH 40 WH 40
WH 160 WH 95 WH 95
WH 280 WH 160 WH 160
WH 280 WH 160 WH 160
4.3

Technical instructions for recharging

Recharging kit (accessory)
Mounting instructions are to be taken from the manual
J
supplied with the recharging kit.
Fig. 4.4 Example 3: use of a cylinder, direct heating circuit
1 ecoMAX 646
2 heating pump (appliance-internal; accessory)
13 weather-based controller VRC 410
Recharging without accessories
It is imperative to keep to the minimum volume flow of
the charging circuit of 1800 l/h.
When dimensioning, pay attention to the pressure losses
of the gravity brake, the piping and the cylinder.
The heating circuit's gravity brake is to be put in the
heating supply; the storage charging circuit's gravity
brake can be mounted anywhere you like.
Druck in mbar
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
0 200 400
Fig. 4.5 The appliance's storage charging circuit without brake
and cylinder (the appliance's pressure loss characteris-
tic curve)
1
2
13
3
3
230V~
3
3
600 800 1000 1200 1400 1600
Installation and maintenance manual ecoMAX 646
1800 2000 2200
Volumenstrom in l/h