Installation guide

Solarflo - Solar Thermal Domestic Hot Water System 21
10.0 Installation of solar controller
10.5 Solar Gain measurement
For solar gain (energy productivity) measurement it
is necessary to fit the flowmeter and collector return
sensor as shown in the diagram in Fig. 23.The collector
return sensor must be securely attached to the return
pipework using the securing tiles supplied and then
covered by insulation.The solar gain of the system is
calculated on the basis of the temperature difference
between the collector flow and return and the solar
primary circulation flow rate.
The function must be switched “on” when commissioning
the Solar Differential Temperature Controller. Refer
to the Baxi Solarflo “Commissioning, Maintenance &
Servicing Guide” for further details.
For System Types 2 and 4 the additional pump (P2) can
be ordered as an accessory, Part No. 5129362.
Tcoll Temperature measuring point collector
Tth Temperature measuring point thermostat
Tret Temperature measuring point collector return
Tst Temperature measuring point storage tank
P Pump
FM Flowmeter
Collector
Type 0:
1 collector, 1 storage tank
Tcoll
Tr et
FM
P
Storage tank
Tth
Tst
Collector
Type 2:
1 collector, 2 storage tanks
with 2 pumps
Tcoll
Tr et
FM
P1
Storage tank1 Storage tank2
Tth
Tst1 Tst2
P2
Collector 1
Type 4:
2 collectors, 1 storage tank
with 2 pumps
Tcoll1 Tcoll2
P1 P2
Tr et
FM
Storage tank1
Tth
Tst
System type Sensor terminal designation (see Fig. 21)
Type Description T1 T2 T3 T4 T5 T6
0 1 collector array, 1 storage cylinder Tcoll1 Tst1 - Tret Tth/TDiff1 Tfr TDiff2
2 1 collector array, 2 storage cylinder (pump-pump) Tcoll1 Tst1 Tst2 Tret Tth/TDiff1 Tfr TDiff2
4 2 collector array, 1 storage cylinder (pump-pump) Tcoll1 Tst1 Tcoll2 Tret Tth/TDiff1 Tfr TDiff2
NOTE:The solar gain flowmeter must be connected to sensor terminals marked WMM (see Fig. 21).
System type Output terminal designation (see Fig. 21)
Type Description A1 A2 A3
0 1 collector array, 1 storage cylinder P1 - Cooling or thermostat or diff. controller
2 1 collector array, 2 storage cylinder (pump-pump) P1 P2 Cooling or thermostat or diff. controller
4 2 collector array, 1 storage cylinder (pump-pump) P1 P2 Cooling or thermostat or diff. controller
Fig. 23