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 AKVAir Solar Plus Accumulator Tank

 

The AKVAir Solar Plus is available from 300-5000 litres and is 3 bar pressure rated as standard.  The tank has 4 coils: two for solar input and two for domestic hot water (DHW), and is divided by a baffle plate about 2/3 of the way up the tank (approximately 60% below and 40% above the baffle).  Each section contains one solar and one DHW coil, with all coils aligned vertically.

 

The 4 coils are permanently fitted and are not removable as in the AKVA, AKVASAN and AKVANTTI tanks.

 

The solar coils are for connection to the solar array via a diverting valve to divert flow through top and bottom coil in series, or through the lower coil only according to tank temperatures. The Solar Plus models are supplied with a solar diverting valve (currently an Esbe VTD322) and a thermostatic mixing valve combination set for regulating flow temperature to DHW.  The two DHW coils are for connection in series.

 

An extra thermostatic mixing valve can be installed between the lower and upper DHW coils if desired to reduce flow through the top coil. This is not included in the Solar Plus price.

 

Automatic boilers, whether gas, oil, wood chip or wood pellet, are connected across the top and mid point of the tank. Batch fed boilers and stoves should be connected top and bottom to provide the full buffer volume of the tank.

 

Radiator circuits are normally connected flow from the top of the tank and return to mid point. Underfloor heating circuits can be connected flow from the mid point, return to the bottom. Heating flow temperature can be controlled using a 3 way blending valve and regulator such as the Thermomatic CC or EC Home.

 

Systems incorporating both radiator and underfloor heating can be connected with flow from both the top and the mid point using a 4 way bi-valent blending valve controlled by a Thermomatic CC / EC Home or similar. This arrangement makes use of heat energy from the mid point of the tank when available.

 

Akvatermís Solar and Solar Plus range of tanks are designed to make solar energy available to both heating and DHW. If the top of the tank is not connected to an automatic boiler capable of meeting the heating demand, consideration must be given to the control of the heating to prevent depletion of the heat reserve for DHW.

 

Arrangement of standard connections and coils

                      

           

Model

Capacity
(l)

Pressure rating

Diameter
(mm)

Height
(mm)

Coils*

Insulation
(mm)
Energy Class

AKVA Solar Plus 300

300

3 bar

810

2100

2x Solar
2x DHW

150

AKVA Solar Plus 500

500

3 bar

900

2100

2x Solar
2x DHW

150

AKVA Solar Plus 750

750

3 bar

1050

2100

2x Solar
2x DHW

150

AKVA Solar Plus 1000

1000

3 bar

1150

2150

2x Solar
2x DHW

150

AKVA Solar Plus 1500

1500 3 bar 1350 2200 2x Solar
2x DHW
150

AKVA Solar Plus 2000

2000 3 bar 1500 2250 2x Solar
2x DHW
150

AKVA Solar Plus 2500

2500 3 bar 1500 2250 2x Solar
2x DHW
100 -

AKVA Solar Plus 3000

3000 3 bar 1600 2300 2x Solar
2x DHW
100 -

AKVA Solar Plus 4000

4000 3 bar 1800 2450 2x Solar
2x DHW
100 -

AKVA Solar Plus 5000

5000 3 bar 2000 2500 2x Solar
2x DHW
100 -

*Coils:

Solar = Lower: 18mm finned copper (12.2 metres)
            Upper: 18mm finned copper (6 metres)
DHW =  Domestic hot water coil, 22mm finned copper (9.4 metres)
       

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