The following pumps and low loss headers are recom-
mended for use with the respective boilers:
Gas-fired condensing boiler
Nominal water circulation volume
for 20 K difference
Speed regulated high-effi-
ciency pump
Low loss header
VKK GB 806/3-E-H
3.44
Item no. 0020022253
WH 95 (Item No. 306721)
VKK GB 1206/3-E-H
4.99
Item no. 0020022253
WH 160 (Item No. 306726)
VKK GB 1606/3-E-H
6.88
Item no. 0020022253
WH 160 (Item No. 306726)
VKK GB 2006/3-E-H
8.60
Item no. 0020022254
WH 280 (Item No. 306725)
VKK GB 2406/3-E-H
10.33
Item no. 0020022254
WH 280 (Item No. 306725)
VKK GB 2806/3-E-H
12.05
Item no. 0020022255
WH 280 (Item No. 306725)
Table 5.1 Application of pumps and low loss headers
5.5
Connecting the DHW cylinder
16a
230 V~
230 V~
2
3
3
10
2
30
3
3
3
2
3
3
2
3
31
15
52
ϑ
42b
32
ϑ
47
1
27
30
43
46
30
5
24
4
BUS
2
17a
45
17b
19
30
3
3
42a
2b
2c
13
21a 21b
2a
2
33
Fig. 5.5 Heating circuit schematic with low loss header
Key
1 ecoCRAFT gas-fired condensing boiler
2a Boiler circulation pump (electronically regulated)
2b Heating pump (mixer circuit 1)
2c Heating pump (mixer circuit 2)
5 Domestic hot water cylinder
10 Radiator thermostat valve
13 VRC 630 weather compensator
15 3-way mixer
16 External sensor
17a Flow temperature sensor
17b Flow temperature sensor (heating circuit 2, mixer circuit)
19 Maximum temperature thermostat
21a Remote control unit VR 80 or VR 90 (radiator circuit)
ł2 Two-wire
ł3 Three-wire
ł4 Four-wire
21b
VR 80 or VR 90 remote control unit (underfloor circuit)
24 Cylinder
sensor
27
Cylinder charging pump
30 Non-return
valve
31 Flow
limiter
32 Cap
valve
33 Sludge
separator
42a Expansion
relief
valve
42b Expansion vessel
43 Safety
group
45
Low loss header
46 Circulation
pump
47 Air
separator
52
Room temperature controlled valve
Installation and maintenance instructions ecoCRAFT 0020055744_08
14
5 Installation
