Sime 8103296, User, Installation And Servicing Instructions

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76
EN
6.7 Water system treatment
When filling and restoring the system it is good practice to use
water with:
– appearance: clear
– pH: 6.5 - 8.5
– hardness: < 19.96°F
– the maximum content of chlorides allowed is 250 mg/l
– it is recommended that the total quantity of water to use, in-
cluding top-ups, with a total hardness of 20°F
DOES NOT
ex-
ceed 20 litres/kW
If the water hardness is more than 20°F, to calculate the total
quantity of water to use, use the formula: (20°F/hardness meas-
ured °F) x 20.
Example with water hardness of 25°F: (20/25) x 20 = 16 l/kW
If the water characteristics are different from those indicated,
it is advisable to use a safety filter on the water delivery pipe to
trap impurities, in addition to a chemical treatment system for
protection against possible deposits and corrosion which could
jeopardise the thermal unit’s operation.
NOTE: the conversion factor between °dH (German degrees) and
°F (French degrees) is 0.56 (1°dH = 0.56 x °F).
m
CAUTION
– It is useful to note the quantities of water to fill the
system and top it up, and the values of the quality of
water used.
6.8 Plumbing connections
The dimensions of the water fittings of Sime DUETTO HE EV boil-
ers are given below.
C
SC
E
F3
F2
F1
U
M
R
D
G
H
S
A B
Fig. 32
Description
DUETTO HE EV
25 35
A (mm) 1030 1130
B (mm) 30 30
C (mm) 56 56
D (mm) 292 292
F1 (mm) 85 85
F2 (mm) 137 137
F3 (mm) 65 65
G (mm) 360,5 360,5
H (mm) 90 90
E DHW inlet G 1/2” G 1/2”
U Hot water outlet G 1/2” G 1/2”
M System delivery G 1” G 1”
R System return G 1” G 1”
CI System filling G 1/2” G 1/2”
S Outlet G 1/2” G 1/2”
6.9 Fuel supply
The possible fuel supply circuits are shown in the following dia-
grams. To size the circuit, refer to the following tables.
Burner lower than the tank
Y
H = x-y
A
X
Fig. 33
H (m)
Lunghezza tubo (m)
Ø6 mm Ø8 mm Ø10 mm
0,5 19 60 100
1,0 21 66 100
1,5 23 72 100
2,0 25 79 100
2,5 27 85 100
3,0 29 91 100
3,5 31 98 100
a
WARNING
– X < 20 m
– A = Bottom valve, which must be kept as low as pos-
sible to prevent cavitation. In any case, Y < 4 m.
Burner higher than the tank
H
A
Fig. 34