Water Heater Operating Cycle - A.O. Smith SGE - 40 Installation, User And Service Manual

2
Legend
Unused numbers are not applicable
1. cover
2. hot water outlet
3. electrical connector block
4. controller
5. pressure switch
6. control panel
7. temperature sensor T
8. combustion chamber
9. anode
10. tank
11. heat exchanger
12. inspection and cleaning
opening
13. temperature sensor T
14. cold water inlet
15. drain valve
16. gas control valve
17. burner
18. fan
19. air supply hose
20. hot surface igniter
21. flame probe
22. chimney pipe
23. condens trap
24. insulation layer
29. base
55. heat exchanger (e.g. solar
heating system)
56. temperature sensor S
58. flue gas test nipple
59. pressure-reducing valve
2.3 Water heater
operating cycle
14
Working principle of the water heater
Cut-away view of the water heater
1
2
2
The water temperature (T
when the gas burner is started and stopped. The temperature changes in the
water heater are used for switching the solar heating system on and off (using
T and S ). T is the curve shown in the figure. In addition, temperatures S
1 2 1
S are used by the solar heating system controller. Temperature S
2
measured in the solar collector and S
exchanger (55).
The other settings that govern the control behaviour are:
• T
set
T is the the required water temperature that has been set on the
set
appliance (11.4.1 "Setting the water temperature via the SET POINT
MENU"). As soon as T
heating the water, but only if the temperature of the heating fluid (S
greater than the temperature measured at the appliance (sensor S
given (adjustable) amount. When T
heating system stops. There is one exception to this rule, which is when
T is set to a higher value than T
solar limit
) at the top of the water heater is used to control
1
between the inlet and outlet of the heat
2
falls below T , the solar heating system starts
1 set
= T = T
1 set solar limit
.
set
Instruction manual SGE
gis
and
1
is
1
) is
1
) by a
2
, heating by the solar