Baxi MULTIFIT Evacuated Tube Collector Kit Instructions page 14

Fig. 15
1 collector, 1 storage tank
Collector
P
FM
Tret
1 collector, 2 storage tanks
with 2 pumps
Tcoll
Storage tank1
Collector
FM
Tret
2 collectors, 1 storage tank
with 2 pumps
Collector 1
Tcoll1
P1
System type
Type Description
0 1 collector array, 1 storage cylinder
2 1 collector array, 2 storage cylinder (pump-pump)
4 2 collector array, 1 storage cylinder (pump-pump)
System type
Type Description
0 1 collector array, 1 storage cylinder
2 1 collector array, 2 storage cylinder (pump-pump)
4 2 collector array, 1 storage cylinder (pump-pump)
NOTE: The solar gain flowmeter must be connected to sensor terminals marked WMM (see Fig. 13).
14 © Baxi Heating UK Ltd 2011
Type 0:
Tcoll
Storage tank
Tth
Tst
Type 2:
Storage tank2
Tth
Tst1 Tst2
P1 P2
Type 4:
Tcoll2
Storage tank1
Tth
Tst
P2
FM
Tret
9.0
9.3 Solar Gain measurement
For solar gain measurement it is necessary to fit the
flowmeter and collector return sensor (Tret) as shown in the
diagram in Fig. 15. The collector return sensor must be
securely attached to the return pipework using the securing
ties 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 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 auxiliary
sensor
Tret Temperature measuring point collector return
Tst Temperature measuring point storage tank
P Pump
FM Flowmeter
Output terminal designation (see Fig. 13)
A1 A2
P1 -
P1 P2
P1 P2
Sensor terminal designation (see Fig. 13)
T1 T2 T3
Tcoll1 Tst1 -
Tcoll1 Tst1 Tst2
Tcoll1 Tst1 Tcoll2
Installation of solar controller
A3
Auxiliary heating
T4 T5
Tret Tth
Tret Tth
Tret Tth
TM
T6