andrews R18 Series Technical Documentation Manual page 33

5.2.4
Type
132
154
180
210
244
280
Table 5 Water flow rate and pressure drop
Type
132
154
180
210
244
280
Table 6 Pump motor rating
The water heater is supplied with a primary pump and must
have a separate secured electrical supply (3 x 400 V) is nor-
mally required for the primary pump.
Tolerance on voltage: 400 V +10 % /-15 %
Flue dimensions
Flues
The water heater has its own integral draught diverter and does
not require any other draught diverter in the flue.
The flue socket at the top of the water heater is sized for the
direct attachment of single wall metal flue pipe.
Optional adapters can be obtained for twin wall metal pipe and
BS 835 type flue pipe. It is recommended that the water heater
be connected to it's own individual open flue systems, although
some open flue systems can be used for multiple installations
of the same type of water heater.
This section should be used for guidance only. A flue specialist
should be contacted to rate a flue design.
You can use the following flue dimensions to assist in flueing:
Type
132
154
180
210
244
280
Table 7 Flue gas volumes
Heat input:
Flow temperature:
Return temperature
Flue gas temperature:
CO
2
Water flow rate Q
in m /h
Grundfos
pump
DNM 65 -
3N~ 400 V
125/136
Q flue m /h
1770
2062
2421
2811
3270
3751
100 %
90 °C
70 °C
130 °C
5,5 %
18IP22B
Pressure drop H in
3
meter water gauge
48
47
46
45
44
43
Pump motor rating
0,75 kW 1410 r.p.m.
3
Chimney
diameter mm
4,7
4,6
4,5
4,4
4,3
4,2
2,22 A
450
500
550
600
650
700
25