Adjusting Pump Speed; Modulating Pump Settings; Ecomax 613/2, 618/2, 622/2, 824/2, 828/2; Ecomax 635, 835 - Vaillant ecoMAX SERIES Instructions For Installation And Servicing

5.9 Adjusting pump speed

5.9.1 ecoMAX 613/2, 618/2, 622/2, ecoMAX 824/2,
828/2
The units are fitted with a two–speed pump. The pump is
delivered with the switch (1) set to position III.
Important note (ecoMAX 824/828 only):
The boiler should only be operated at pump set-
ting III as the heating capacity for hot water is
reduced when operated at pump setting II.
It is possible, however, to change the pump set-
ting from Level III to Level II manually when
there is noise coming from the heating system.
400
300
200
Position II
100
0
0 200 400 600
Fig. 5.2 Pump specifications ecoMAX 613/2, 618/2, 622/2,
824/2, 828/2

5.9.2 ecoMAX 635, 835

The ecoMAX 635, 835 are fitted with an automatic
modulating pump which regulates according to the resi-
stance of the heating circuit.
Within the diagnostic system (see next page) it is possi-
ble to preset the pump to five resistance persentage
steps up to the maximum available output in 53, 60, 70,
85 and 100 %. Therefore when using this selection opti-
on the automatic modulation is switched off.
Note:
Where a mixing valve is fitted in the heating cir-
cuit (underfloor heating circuit) the pump set-
ting in the diagnostic mode (d.14) should be set
to 100%.
Instructions for installation and servicing ecoMAX
Position III
800 1000 1200 1400 1600 1800
Volumeflow [ l/h ]
Commissioning Part I 5
400
300
200
53 %
100
0
0 200 400 600
Fig. 5.3 Pump specifications ecoMAX 635, 835
Modulating pump settings (ecoMAX 635, 835 only)
In order to set the pump from modulating to a number
of fixed persentage output values, please follow the
instruction below.
• Open the appliance to obtain access to the diagnostic
display.
• Turn the appliance "on/off"–contol to the "I"–position
("on").
1 Press the "i" and "+" buttons below the display simul-
taneously. The display will now show "d.0". Use the
"+" button to scroll up to "d.14".
2 Press the "i"–button to display the diagnostic informa-
tion (e. g. factory setting "auto" = pump modulation on).
3 Press the "+" or "–" button to select the pump resi-
stance value (0 = auto, 1 = 53%, 2 = 60%, 3 = 70%, 4
= 85%, 5 = 100% these figures represent the percen-
tages of the maximum pump output).
70 % 85 %
60 %
800 1000 1200 1400 1600 1800
Volumeflow [ l/h ]
100 %
1900
35 35