Solar Thermal Information

ManualsBrandsCaleffi ManualsHeating Supplies3/4" Male Thread x 3/4" Sweat Pump Station Fittings (4 Fittings)

Characteristics

Pump speed control functions (iSolar 2, 4 & Plus)

Pump speed control can improve system efficiency by reducing

the flow to the collectors on cloudy days to improve solar thermal

transfer and reduce electrical consumption. This is achieved

by the differential temperature value between the collectors

and storage tank.

If the value for the ΔT switch-on is reached (e.g. ΔT on = 9º),

the pump will start with 100% pump speed for 10 seconds, then

reduce the speed to the adjusted minimum pump speed (min.

pump speed = 30 %, adjustable). If the temp-erature difference

reaches the set value (e.g. ΔT Set = 18º), pump speed will in-

crease by 10 %. At any further rise of 3º ΔT the pump speed will

increase by 10% until the maximum of 100% is reached.

– +

SET

User-friendly operation

System screen LCD display

with 16-segment display and

8 symbols for system status

Operating LED control lamp

3 push-button controls

Attractive design and

compact dimensions

Easy to install

Standard operation functions

iSolar

120V 120V 120V 120V 120V

12 or 24V

1 iSolar 2 iSolar 3 iSolar Plus

Standard relay output 102 0

Speed control triac output (30 to 100%) 0 1 0 2

Sensor inputs (temperature)

Max. solar collector arrays

Max. solar storage tanks

Two tank priority logic

Heat dump function (second relay)

A062752A032752A022752A012752Code

Selectable programs 1 1 3

iSolar 4

Drainback pump speed control

Drainback booster pump (second relay)

Thermostat function (second relay)

Backup heat function (second relay)

yes

A042752

3 10

iSolar Plus PV

444 444

111 212

no no no no yes

yesno no no no yes

yesyesyesno no yes

yesyesyesyesyes yes

yesno no noyesyes

257260A

PV1 or PV2

Second deltaT-function

Real time clock (timer function)

Collector freeze protection

Evacuated tube collector function

Min. collector temperature

Vbus data commincation

Tank (night time) cooling

Emergency shutdown functions

Operating hours counter

Energy metering measurement

Collector cooling functions