A.O. Smith SGS - 100, Installation, User And Service Manual

Page: 62 / 121

Instruction manual SGS 59
gis
6 Draining
Installation diagram
6.1 Draining unvented
installations Some service activities require the water heater to be drained. The procedure
is as follows:
1. Activate the
MENU
with .
2. Position the cursor in front of
OFF
.
3. Confirm
OFF
with .
4. Wait until the fan has stopped. The icon is then dimmed.
Caution
Failure to wait until the fan stops can cause damage to the water heater.
Legend Vented and unvented
Unused numbers are not applicable
1.
pressure relief valve
(mandatory if the mains water
pressure is too high)
3. T&P valve
4. stop valve (recommended)
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
10. manual gas valve
(mandatory)
11. service stop valve
12. temperature gauge (optional)
13. condensation drain
14. draw-off points
15. expansion valve (mandatory)
16. expansion vessel
(mandatory)
17. 3-way aeration valve
(recommended)
18. cold water head tank
19. float switch
A. cold water supply
B. hot water supply
C. circulation pipe
D. gas supply
E. overflow pipe
H. overflow protection
IMD-0787 R0
VENTED
UNVENTED
A
4
19
18
E
H
17
C
S
1
37
11
11
12
12
T
T
26
42
14
14
14
Q
T
6
8
5
5
4
4
4
4
S
4
9
9
9
G
3
3
F
B
S
2
S
3
D
10
2
13
16
C
S
1
37
11
12
12
T
T
26
42
14
14
14
Q
T
6
8
5
5
4
4
4
4
S
4
9
G
3
3
F
B
B
S
2
S
3
D
10
13
4
16
16
38
38
A
4 5 1
15
MENU
»OFF
^ ON
È WEEK PROGRAM