Table of Contents
Advertisement
This cleansing must take place prior to the fitting of the
new boiler and be in accordance with BS 7593. For advice
on the application of system cleansers contact Sentinel,
Betz Dearborn Ltd. Widnes, Cheshire, WA8 8UD. Tel:
0151 495 1861, or Fernox, Alpha Fry Technologies, Tandem
House, Marlow Way, Croydon, CR0 4XS. Tel 0870 6015000
3.10.2 Filling and make up
The system can be filled via a separate filling point fit-
ted at a convinient position on the heating circuit. The
connection must be removed when filling is completed.
Where local Water Authority regulation does not allow
temporary connection, a sealed system filler pump with
break tank must be used. The heating system will not be
filled automatically from the domestic hot water side.
(Alternative methods of filling sealed systems are given
in BS 5449).
3.10.3 Pressure relief valve
A pressure relief valve is provided with the boiler. This
safety device is required on all sealed C.H. systems and
is preset at 3 bar and provided with a 15 mm compressi-
on connection for a discharge pipe, which must be of no
less than 15 mm in diameter. The pressure relief valve
must not be used for draining purposes.
3.10.4 Pressure gauge
This is factory fitted to the boiler and indicates the pri-
mary circuit pressure to facilitate filling and testing.
3.10.5 Expansion vessel
Initial system pressure (bar)
Pressure relief valve setting (bar)
Total water content of system litres
25
50
100
125
150
175
200
225
250
275
300
325
350
375
400
425
450
475
500
For system volumes other than
those given above, multiply the
system volume by the factor across
Table 3.3 Sizing of additional expansion vessel
Instructions for installation and servicing ecoMAX
Vessel
Volume [L]
1.0
1.5
3.0
2.7
3.9
5.4
7.8
10.9
15.6
13.6
19.5
16.3
23.4
19.1
27.3
21.8
31.2
24.5
35.1
27.2
39.0
30.0
42.9
32.7
46.8
35.7
50.7
38.1
54.6
40.9
58.5
43.6
62.4
46.3
66.3
49.0
70.2
51.8
74.1
54.5
78.0
0.109
0.156
General requirements 3
ecoMAX 635 incorporates a 10 litre expansion vessel
which is suitable for a sealed heating system with a
maximum water content of 100 litres.
If the nominal capacity of the built in expansion vessel is
not sufficient for the heating system (for instance in
case of modernization of old open systems) an additio-
nal expansion vessel can be installed external to the boi-
ler. It should be fitted in the return pipe as close as pos-
sible to the boiler in accordance with BS 5449: Part 1.
Guidance on the sizing of an additional expansion vessel
is given in Table 3.3.
3.11 Pump specifications
3.11.1 Circulating pump
The ecoMAX 635 is fitted with a modulating circulating
pump. The pump head available for the heating system
is shown in figure 3.6.
400
300
200
53 %
100
0
0
200
400
600
Fig. 3.6 Pump specifications
3.11.2 System by–pass
An automatic system by–pass is included within the boi-
ler. The boiler is suitable for use in systems with ther-
mostatic radiator valves and no additional by–pass is
required.
3.11.3 Venting
The boiler is fitted with an automatic air vent. Additional
provision should be made to enable the heating system
to be vented during filling and commissioning either by
automatic air vents or manually.
3.12 Condensate trap
The boiler is fitted with a condensate trap incorporating
a water trap of 75 mm.
70 %
85 %
60 %
800
1000 1200
1400
1600 1800
Volumeflow [ l/h ]
100 %
1900
11
11
Advertisement
Table of Contents
