andrews R18 Series, Technical Documentation Manual

Page: 33 / 71

18IP22B
25
5.2.4 Flues
Type Water flow rate Q Pressure drop H in
in m /h meter water gauge
3
132 48 4,7
154 47 4,6
180 46 4,5
210 45 4,4
244 44 4,3
280 43 4,2
Table 5 Water flow rate and pressure drop
Type Grundfos Pump motor rating
pump
132
154
180
DNM 65 -
210 125/136
244
280
3N~ 400 V 0,75 kW 1410 r.p.m. 2,22 A
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
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 Q flue m /h Chimney
3
diameter mm
132 1770 450
154 2062 500
180 2421 550
210 2811 600
244 3270 650
280 3751 700
Table 7 Flue gas volumes
Heat input: 100 %
Flow temperature: 90 °C
Return temperature 70 °C
Flue gas temperature: 130 °C
CO 5,5 %
2