Vaillant Solar System and auroSTOR unvented solar..., Start-Up, Maintenance And Troubleshooting Manual

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29 Manual - Solar hot water systems 0020009607_02
Immersion heater
The auroSTOR solar cylinders are equipped with an
additional immersion heater of 3 kW, including the
operating thermostat and energy cut-off device.The
immersion heater is situated behind the front plate. It is
designed for use in unvented cylinders and includes a
thermostat control and thermal cut out for over heat
protection.
h
Note:
In the event of a replacement, only the right
immersion heater equipped with a thermal cut
out for overheating protection may be used.
Secondary return
The water control pack has a connection for a secondary
return.
• Remove the 3/4“ dummy plug (BSP thread) from the
water control pack.
• Connect a WRAS-approved circulating pump, which
contains a non-return valve, to the water control pack
(see Fig. 5.1).
• Establish the connection to the secondary return.
5.1.2 Technical data of the auroSTOR solar cylinder
Entry Unit VIH S GB 200 S VIH S GB 250 S VIH S GB 300 S
Cylinder:
Size l 200 250 300
Maximum water supply pressure bar 10
Operating pressure bar 3.5
Pressure limiting valve bar 3.5
Expansion relief valve bar 6.0
Hot water expansion vessel admission pressure bar 4.0
Temperature and pressure relief valve °C/bar 95 / 7.0
Net weight kg 39 44 49
Weight (full) kg 245 310 340
Height mm 1499 1789 2109
Cylinder connections:
Cold water supply 22 mm pressure pipe
Hot water connection 22 mm pressure pipe
Pressure-controlled cold water outlet 22 mm pressure pipe
Secondary return Inches G 3/4
Flow (boiler/solar circuit) 22 mm pressure pipe
Return (boiler/solar circuit) 22 mm pressure pipe
Electrical connections:
3 kW immersion heater (according to ENBS 60335) 230/240 V, 50 Hz
Length of the immersion heater mm 430
Motorised 2 port valve 230/240 V, 50 Hz
Cylinder thermostat 230/240 V, 50 Hz
Thermal cut out for solar pump 230/240 V, 50 Hz
Heating coil:
Heat loss kW/24 h 1.9 2.1 2.4
Heat up time (boiler part) mins 21 26 30
Recovery (boiler part) mins 13 16 21
Table 5.4 Technical data of the auroSTOR solar cylinder
h
Note!
The heat-up time is based on a primary flow
rate of 9 l/min at 80 °C.
Temperature rise from 15 °C to 65 °C
Installation 5
NOTE
The water control group used is the same as on our uniSTOR
cylinders and has a connection that can be used for secondary
circulation on those cylinders, it may also be used for the
connection of a legionella circulation pump connection.
In solar systems secondary circulation is not recommended as it
will waste energy and reduce solar gains. as it heats the cold store
area but of course can be used for the connection of a legionella
circulation pump.
.