Working principle of the water heater
16
Instruction manual SGS
2
gis
Graphical representation of operating cycle
Note
T
1
can rise above T
set
. However, this is only possible if T
solar limit
is increased
via the service menu.
2.4
Protection for the
water heater
2.4.1
Introduction
The controller monitors the water temperature, helps ensure the safe use of the
solar heating system, and ensures safe combustion. This takes place using:
•
the Appliance water temperature protection
•
the Storage tank water temperature protection
•
the Gas control valve
•
the Fan
•
the Pressure switch
•
the Flame probe
2.4.2
Appliance water temperature protection
The controller uses temperature sensors T
1
and T
2
to monitor several
temperatures that are important for safety.
The table explains the functioning of these temperature sensors.
Temperature protection
Legend
A = Gas burner on
B = Gas burner off
T
1
:
•
= No heat demand, so water
is not heated
•
= Water heated via solar
heating system
•
= Water heated via solar
heating system and gas burner
t = time
T = Temperature
45
o
C = Minimum tap water
temperature
T
solar limit
T
set
Solar diff.
Hys.
T
min = 45 C
Safety
Description
Anti-frost:
- T
1
< 5°C
- T
2
< 5°C
The frost protection cuts in. The water is heated to 20°C.
At the maximum water
temperature:
- T
1
> 88°C
- T
2
> 88°C
The high-limit safeguard serves to prevent overheating and/or excessive
formation of scale in the appliance. If the high-limit safeguard is activated,
heating is stopped. This causes the water in the tank to cool down. Once the
water has cooled sufficiently (T
1
< 81°C), the controller resets the appliance.
For extra safety:
- T
1
> 93°C
- T
2
> 93°C
A lockout error of the water heater controller takes place. The controller must
be manually reset before the appliance can resume operation (8.3 "Error
conditions"). The reset may only be performed if T
1
< 81°C.
Summary of Contents for SGS - 100
Page 7: ...4 Instruction manual SGS gis...
Page 11: ...Contents 8 Instruction manual SGS...
Page 23: ...Working principle of the water heater 20 Instruction manual SGS 2 gis...
Page 37: ...Installation types 34 Instruction manual SGS Installation 3...
Page 57: ...Conversion to a different gas category 54 Instruction manual SGS 4 is...
Page 65: ...Draining 62 Instruction manual SGS 6 gis...
Page 71: ...Status of the water heater 68 Instruction manual SGS 8 gis...
Page 75: ...Shutting down 72 Instruction manual SGS 10 gis...
Page 103: ...Service interval 100 Instruction manual SGS 14 is...
Page 112: ...Instruction manual SGS 109 is...
Page 119: ...Instruction manual SGS 116...
