DIFFERENTIAL TEMPERATURE CONTROLLER
FOR SOLAR HEATING SYSTEMS WITH TWO
BACKUP STAGES
MCSOLIIEPLV7-04T-15886
1. DESCRIPTION
The MICROSOL II e plus is a differential temperature controller for solar heating systems, that
simplifies water temperature management in thermal tanks and swimming pools, using solar power
effectively. It has functions that avoid water from overheating or freezing within the piping. It controls the
water circulation pump based on the differential temperatures between the solar panels and the thermal
tank or swimming pool. It has two outputs for backup heating, that can be electric, gas, diesel-fuelled, or
to program the filtering of the swimming pool. The output AUX2 can also be used to program pool
filtration or as a thermostat for water circulation in the keg so the hot water takes less time to reach the
consumption point, thus wasting less water. In addition, it has a real time scheduling feature that allows
the programming. If a weekly schedule with up to eight daily events. It has RS-485 serial communication
port for Sitrad monitoring and management.
What do auxiliary systems mean (or backup systems)?
They function as backups for the solar heating system on rainy and cold days. They are usually gas
burners, electric heaters, or heat exchangers (heat pump). If the solar heating system is not enough to
heat the water (thermal tank and swimming pool), the auxiliary systems start to operate to heat the
water. Sensor 3 is responsible for the activation of the auxiliary equipment (backup systems).
2. SAFETY RECOMMENDATIONS
- Read this manual before installing and using the controller;
- The installation procedures should be performed by a qualified technician;
- Wear adequate personal protective equipment (PPE);
- Make sure the power supply is switched off and will not be switched on during the installation of the
controller;
- Make sure the controller is properly fastened;
- For application in location subject of water spills, install the vinyl protection provided with the
controller;
- For protection under more critical conditions, we recommend the Ecase cover, available as an option
(sold separately);
3. APLICATIONS
• Pumped solar heating systems
4. TECHNICAL SPECIFICATIONS
evolution
Microsol II e plus
Ver
.07
Temperature range (**)
Sensor 1 - Panels (or solar collector):
Metal case - Silicon: -50 to 200°C / -58 to 392°F
Power Supply
Microsol II E plus:115 or 230 Vac * (50/60 Hz)±10%
Microsol II EL plus:12 or 24 Vdc or Vac * +10%
Maximum current per output
PUMP: 12(8)A / 240Vac 1HP
AUX 1: 10A / 240Vac 2400W
AUX 2: 5(3)A / 240Vac
Operating temperature
0 to 50 ºC / 32 to 122°F
Operating humidity
10 to 90% UR (no condensation)
(*) Acceptable variation in relation to the rated voltage.
(**) This device can measure and control temperatures of up to 200°C/392°F, when used in conjunction with a SB59
model silicon sensor cable (sold separately).
IMPORTANT: Only sensors 1 and 2 are included with the product. Sensor 3 may be purchased separately.
Degree of protection
Dimensions (mm)
Cutout dimensions (mm)
IP 65 (frontal)
76 x 34 x 77 mm (WxHxD)
X = 71±0,5 Y = 29±0,5 (see Image V)
IMPORTANT
EVOLUTION LINE INSTRUMENTS HAVE TWO
DIFFERENT TERMINAL SIZES, BUT BOTH ARE
COMPATIBLE WITH THE 2.0 mm SCREWDRIVER. USE
APPROPRIATE TOOLS DURING INSTALLATION AND
ENSURE A LONGER LIFE AND THE PROPER
OPERATION OF THE PRODUCTS.
Microsol II
e
plus
Microsol II
e plus
1
5
6
7
8
2
3
4
9 10
11 12
13
14
15 16
17
115 Vac
S2
S3*
S1
PUMP
Image I:
Microsol II E plus - 115Vac
1
5
6
7
8
2
3
4
9 10
11 12
13
14
15 16
17
S1
Image II:
Microsol II E plus - 230 Vac
1
5
6
7
8
2
3
4
9 10
11 12
13
14
15 16
17
12 Vac/dc
Power supply
Image III:
Microsol II EL plus - 12Vac/dc
1
5
6
7
8
2
3
4
9 10
11 12
13
14
15 16
17
24 Vac/dc
Image IV:
Microsol II EL plus - 24Vac/dc
S1
S1
SENSOR IDENTIFICATION:
S1: Solar panels
S2: Tank / swimming pool
S3*: Surface
Have this manual to hands when
using the FG Finder application.
Approximate consumption
0.5 VA
5. INDICATIONS AND KEYS
Increase key
Decrease key
Set key
Quick access
menu key (Flatec)
PUMP output indication LED
AUX1 output led indication
AUX2 output led indication
Temperature unit indication LED
Control functions switched off indication LED
Functions lock indication LED
Microsol II e plus
Sensor 3 - Auxiliary equipment activation (backup systems):
Plastic case - PVC: -50 to 105°C / -58 to 221°F
Sensor 2 - Swimming pool (or thermal tank):
Plastic case - PVC: -50 to 105°C / -58 to 221°F
6. CONNECTION DIAGRAM
6.1. Electric connections (see images I to IV)
6.2. Temperature sensor connection
- Connect the wires of Sensor S1 to terminals "7 and 8" / Sensor S2 to terminals "1 and 2": the polarity is
indifferent and if Sensor S3 is used, it must be connected to terminals "1 and 3".
- Sensors cables lenght can be extended up to 200 meters using a PP 2 x 24 AWG cable.
- For water immersion use a thermowell (image VI-item 15), available from the Full Gauge Controls
product line (sold separately).
Electric noise suppressor filter (sold separately)
Diagram showing the connection of
suppressors in contactors
A1 and A2 are the terminals of the contactor's
coil.
Diagram showing the connection of
suppressors in direct drive loads
For the direct drive, consider the specified
maximum current.
A1
A2
SUPRESSOR
FILTER
Load
SUPRESSOR
FILTER
6.3. Controller power supply
Use the terminals according to the table below, depending on the version of the controller:
Bornes Microsol II E plus Microsol II EL plus
9 e 10
9 e 11
115 Vac
230 Vac
12 Vac/dc
24 Vac/dc
D1
A
B
SITRAD
A
B
SITRAD
A
B
SITRAD
A
B
SITRAD
S2
S3*
D1
S2
S3*
D1
S2
S3*
D1
230 Vac
PUMP
CAPTION:
To the terminal of the connection block
PUMP
Power supply
PUMP
Control
Functions
Shutdown
Functions
lock
Serial
programming
Degree of
protection
IP 65
FRONT
Temperature
differential
Protection
against
freezing
Protection
against
superheating
Supervisory
system
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