Instruction manual SGS 15
gis
fluid (S1) is a certain (adjustable) value higher than the temperature
measured at the appliance (sensor S2). As soon as (Tnet = Tset = Tsolar limit),
heating via the solar heating system is stopped. There is one exception to
this rule, and that is when Tsolar limit is set to a higher value than Tset.
• Hysteresis
The moment Tnet falls below (Tset - Tsolar diff - Hysteresis), the controller
registers such a heat demand that the gas burner and the solar heating
system jointly heat the water. The solar heating system is only employed
when the temperature measured by S1 is a certain (adjustable) value grater
than that of S2.
•T
solar diff
When Tnet exceeds (Tset - Tsolar diff), the gas burner is shut off and the water
is heated exclusively by the solar heating system. When Tnet rises above
Tset (provided Tset = Tsolar limit), the solar heating system switches off. The
value of Tsolar diff is adjustable(12.8.5 "Setting the solar difference").
•T
solar limit
Preset(12.8.4 "Setting the solar limit temperature") water temperature at
which heating via the solar heating system is stopped.
Graphical representation of heating cycle
Note
Tnet can rise above Tset,. However, this is only possible if Tsolar limit is
increased via the service menu.
Note
Tsolar limit can be lower than Tset; this will mean that Tnet can never be equal
to Tset.
2.4 Protection for the appliance2.4.1 Introduction
The electronic 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 Gas valve
•the Fan
•the Pressure switch
•the Flame probe
Legend
A = Gas burner on
B = Gas burner off
Tnet:
• = no heat demand, so water
not heated
• = water heated via solar
heating system
• = water heated via solar
heating system and gas burner
t = time
T = Temperature
45 oC = Minimum tap water
temperature
T
solar limit
T
set
Solar diff.
Hys.
T
min = 45C