Working principle of the appliance
14 Instruction manual SGS
2gis
Cut-away view of the appliance
2.3 The appliance's
heating cycle The net water temperature (Tnet) in the appliance is used to regulate when both
the gas burner and the solar heating system are started and stopped. Tnet is the
curve shown in the figure. The controller uses two measured values to calculate
this temperature: T1 (7) and T2 (13). In addition, temperatures S1, S2 and S3
are used by the controller of the solar heating system. S1 is measured in the
solar collector. S2 is located between the inlet and outlet of the heat exchanger
of the storage tank. S3 is measured at the top side of the storage tank.
Depending on whether or not hot water is being drawn off, hot water can be
pumped from the storage tank to the appliance. This happens when S3 is 5 oC
higher than Tnet. Water is then pumped from the appliance to the storage tank,
causing hot water to flow from the storage tank into the appliance. The pump
switches off as soon as S3 equals Tnet.
The other settings that govern the control behaviour are:
•T
set
Tset is the the required water temperature that has been set on the
appliance (11.4.1"Setting the water temperature via the SET POINT
MENU"). As soon as Tnet falls below Tset, the water heating via the solar
heating system is started, however, only if the temperature of the heating
Legend
Only applicable numbers are
mentioned.
1. cover
2. hot water outlet
3. electrical connector block
4. electronic controller
5. pressure switch
6. control panel
7. temperature sensor T1
8. combustion chamber
9. anode
10.tank
11.heat exchanger
12.inspection and cleaning opening
13.temperature sensor T2
14.cold water inlet
15.drain valve
16.gas control
17.burner
18.fan
19.air supply hose
20.hot surface igniter
21.flame probe
22.chimney pipe
23.siphon
24.insulation layer
25.mains power choke
26.EMC filter
27.frequency controller
28.potentiostat
29.pallet
IMD-
0
21
9
R2
1
25
19
16
10
11
22
23
5
9
26
27
28
2
4
7
6
3
8
18
20
21
17
12
13
14
15
24
29