A.O. Smith SGE, Installation And Operation Manual

Page: 54 / 110

Draining
54 Instruction manual SGE
6
gis
6.1 Draining unvented
installations
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 symbol is then dimmed.
Caution
Failure to wait until the fan stops purging can cause damage to the
appliance.
5. Switch the appliance OFF (position 0) using the ON/OFF switch on the
control panel.
6. Isolate the water heater from the power supply by putting the isolator
between the appliance and the mains power supply to position 0.
7. Shut off the gas supply (10).
8. Close the stop valve (11) in the hot water pipe.
9. Close the supply valve (4) in the cold water supply (A).
10. Open the drain valve (9).
11. Bleed the appliance (or installation) so that it drains completely.
Legend
Only applicable numbers are
mentioned.
1. pressure-reducing valve
(mandatory if the mains water
pressure exceeds 8 bar)
3. T&P valve (mandatory)
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)
10. manual gas valve (mandatory)
20. pressure valve (mandatory)
26. air bleed (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. expansion vessel (mandatory)
17. 3-way aeration valve
(recommended)
18. water tank
19. float valve
23. pressure valve (mandatory)
37. combined Q/T sensor (optional)
38. solar heating system pump station
(modulating - mandatory)
A. cold water supply
B. hot water supply
C. circulation pipe
D. gas supply
E. overflow pipe
F. heat exchanger supply
G. heat exchanger return
H. overflow safety
S1.collector sensor (mandatory)
S2.tank sensor (mandatory)
S4.heat exchanger discharge sensor
(optional)
MENU
»OFF
^ ON
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