Saunier Duval ISOMAX F 28 E, Installation And Operating Instructions Manual

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8
●
Copper tubing or plastic Hep
2
0 may be used for
the domestic hot water system. Unnecessary
pressure losses should be avoided.
●
A flow restrictor limiting the flow through the boiler
to a maximum of 16 l/min is fitted to the boiler.
●
The boiler will operate with a minimum supply
pressure of 0,7 bar, but under reduced flow rate.
Best operating comfort will be obtained from a sup-
ply pressure of 1 bar.
DOMESTIC HOT WATER SYSTEM DESIGN
'Hard Water Areas'
In areas where the water is 'hard', more than
200mg/litre, it is recommended that a proprietary
scale reducer is fitted in the cold water supply to
the boiler.
Shy 163cUK
Diagram 6
BOILER SCHEMATIC
1 - Domestic thermistor
2 - Three way valve
3 - Gas valve
4 - Gas valve ignition module
5 - Temperatur sensor for accumulation vessel
6 - Accumulation vessel
7 - Burner
8 - Ignition electrode
9 - Combustion chamber
10 - Heating safety valve (3 bar)
11 - Main heat exchanger
12 - Air pressure switch
13 - Flow detector
14 - DHW pump
15 - Non return valve
16 - Bypass
17 - Domestic heat exchanger
18 - Heating pump
19 - Heating expansion vessel
20 - Heating thermistor
21 - Overheat safety thermostat
22 - Flame sensor electrode
23 - Fan
24 - Domestic safety valve (6 bar)
25 - Loss of water sensor
26 - Domestic expansion vessel
27 - Pressure/temperature relief (7 bar)
28 - Domestic safety valve (10 bar)
A - Heating return
B - Cold water inlet
C - Heating flow
D - Domestic hot water outlet
E - Gas
D1 - Discharge from HTG safety valves
D2 - Discharge from DHW safety valves
D3 - Discharge from temp/press (to tundish)
A B C D E
D1 D1 D1 D2 D1 D3
2
3
6
4
26
7
5
8
9
1
12
13
10 28
15
14
16
18
17
19
20
22
21
23
11
25
24
27
D1 D3
Discharge from HTG+
domestic prv on jig
D2
Discharge from DHW
safety valves
Tundish
Gully
Diagram 6a
Valve
outlet size
Maximum
resistance
allowed
expressed as a
length of
straight pipe
i.e. no elbows
or bends
Resistance
created by
each elbow or
bend
Minimum
size of
discharge
pipe D2
from
tundish
Minimum
size of
discharge
to tundish
G 1/2 15 mm 22mm up to 9 m 0.8 m
28 mm up to 18 m 1.0 m
35 mm up to 27 m 1.4 m
G 3/4 22 mm 28 mm up to 9 m 1.0 m
35 mm up to 18 m 1.4 m
42 mm up to 27 m 1.7 m
G 1 28 mm 35 mm up to 9 m 1.4 m
42 mm up to 18 m 1.7 m
54 mm up to 27 m 2.3 m