Application Information; System; Water Temperature; Water Pressure - REMEHA Gas 550 Technical Information

Number of sections
Nominal heat
output
Hi /
Nominal
NCV
heat input
Hs /
GCV
Gas consumption m
B
Dimensions
Ø D
Water contents
Boiler weight (dry)
Flue gas flow rate kg/h
Table 02 Technical data Remeha Gas 550 Duo
* Supplied with a flue gas pipe adapter
4

APPLICATION INFORMATION

4.1 L.P.H.W. system

4.1.1 Water temperature

Maximum water temperature is 110°C (high limit ther-
mostat).
Highest boiler water temperature is 95°C (control ther-
mostat).
Minimum return water temperature is 20°C at a flow rate
related to a ∆t of 20°C (flow/return temp).

4.1.2 Water pressure

Boiler sections are factory pressure tested at 10 bar.
Maximum pressure test boiler block is 7,8 bar.
Maximum working pressure is 6 bar
Minimum working pressure is 0,8 bar at a maximum
working temperature of 110°C or 0,3 bar at a maximum
working temperature of 95°C.

4.1.3 Water flow

The minimum water flow through the boiler on shut down
is:
Output boiler in kW = m
93
This minimum flow must be maintained for approxima-
tely 5 minutes after the burner stops firing to avoid high
temperature shut down due to residual heat gain.
Due to the design and manufacture of the boiler no
Supplied By www.heating spares.co Tel. 0161 620 6677
2 x 10 2 x 12
kW 139-556 170-680
kW 160-618 195-756
kW 177-686 217-840
3
/h 66 80
mm 1240 1460
mm 450* 500*
litre 582 698
kg 2900 3390
1385 1694
3 /h
2 x 14 2 x 16
202-806 233-932
232-896 266-1036
256-996 296-1152
94 110
1680 1900
600* 650
814 930
3880 4370
2066 2478
specific minimum water flow requirements exist other
then for overheating protection.

4.1.4 Water treatment

The system should be filled with mains cold water (for
the UK this will usually have a pH of between
7 and 8).
Pressurised installations with a boiler/system content
ratio of 1:10 or less should not require water treatment,
provided that the following conditions apply:
1. The system is flushed thoroughly to remove all fluxes
and debris and then filled completely once.
2. Make up water is limited to 5 % per annum.
3. The hardness of the water does not exceed 360 ppm
(20°D).
All scale deposits will reduce the efficiency of the boiler
and should be prevented. However provided the above
is complied with any scale produced will not be too
detrimental to the boiler efficiency and will not reduce
the anticipated life expectancy of the boiler.
Note: Scale deposits in excess of 3 to 5 mm will reduce
boiler efficiency and greatly increase the risk of prema-
ture casting failure.
7
2 x 18
265-1058
301-1176
335-1306
124
2120
650*
1046
4620
2752