A.O. Smith AHD 290 User Manual
Page 43
43
1.5.3 Water circuit – hydraulics diagram
IMD-0604 R0
VENTED
UNVENTED
A
4
19
18
E
H
17
16
15
T
T
A
1
5
13
13
4
6
6
5
5
4
4
4
4
C
C
B
B
9
9
14
14
14
14
14
14
12
12
11
11
4
4
Legends
Only applicable numbers are mentioned.
1.
pressure-reducing valve
(mandatory if the mains water
pressure exceeds 8 bar)
4.
stop valve (recommended in pipe
C and mandatory in pipe A)
5.
non-return valve (mandatory)
6.
circulation pump (optional)
9.
drain valve (mandatory)
11.
service stop valve
(recommended)
12.
temperature gauge
(recommended)
13.
condensation drainage
(mandatory)
14.
hot water draw-off points
15.
expansion valve (mandatory)
16.
expasion vessel (mandatory)
17.
3-way aeration valve
(recommended)
18.
water tank
19.
float valve
A.
cold water supply
B.
hot water supply
C.
circulation pipe
E.
overflow pipe
H.
overflow safety