DIFFERENTIAL THERMOSTAT
FOR SOLAR HEATING
Ver.06
MICROSOL Ri
1. DESCRIPTION
The
MICROSOL Ri
is a
that commands a water circulation
pump through the temperature differential that exists between the solar collector panels and the thermal
reservoir or pool in solar heating systems.
MICROSOL Ri
has functions that improve the absorption of solar energy, prevent the freezing in
the pipes during winter and control the overheating.
2. TECHNICAL SPECIFICATIONS
- Power Supply:
MICROSOL Ri 115/230 Vac ±10% (50/60 Hz)
MICROSOL RiL 12/24 Vac/dc
- Temperature control:
-50 to 105°C
- Resolution:
0.1°C
- Load current:
16(8)A / 250 Vac 1HP
- Dimensions:
71 x 28 x 71mm
- Operation temperature:
0 to 50 ºC
- Operation humidity:
10 to 90% RH (without condensation)
This instrument can measure and control up to 200ºC temperatures, since used with silicone cable
sensor (ex.: SB59).
differential thermostat for solar heating
3. CONFIGURATIONS
3.1 - To access the function menu
a)
Press the key for 2 seconds until appears, release it after that.
b)
When appears, press (short touch) and insert the access code (123) through the keys
and . To confirm press .
c)
Through the keys and access the other functions and do the same to adjust them.
d)
To reset the menu and return normal operation, press (long touch) until appears.
SET
SET
SET
SET
Fun
Descripton
Access code 123 (one hundred and twenty-three)
Preferential indication
Differential (t1-t2) to turn on the pump
Differential (t1-t2) to turn off the pump
Temperature of anti-freeze (S1) in the collectors to turn on the pump
Overheating temperature (S1) to turn off the pump
Overheating temperature (S2) to turn off the pump
Overheating temperature (S3) to turn off the pump
Cooling (S3)
Overheating temperature hysteresis of S2 sensor
Overheating temperature hysteresis of S3 sensor
3.2 - Parameters table
Standard
0
1.0
1.0
2.9
0.0
0.0
0.0
0.1
0.1
0
8.0
4.0
8.0
90.0
90.0
1.0
1.0
-
-
°C
°C
°C
°C
°C
°C
-
°C
°C
Min
Max Unit
999
40.0
40.0
10.0
105
105
105
5.0
5.0
3.3 - Parameters description
Access code (123)
This code is required to change configuration parameters, while it is not required to display the
parameters.
Preferential indication (what will be displayed)
Sensors differential (S1 - S2)
Collector temperature (S1)
The thermal reservoir or pool (S2)
Surface temperature.
The other temperatures can be quickly checked by holding down or keys for a few seconds and
then returning automaticly to the indication that was select in as preferential.
S1 Display offset
S2 Display offset
S3 Display offset ( ** )
This parameter allows adjustments up to 200ºC but to work on these conditions it has to be used with
silicone cable sensor (ex.: SB59).
-5.0
-5.0
-5.0
0.0
0.0
0.0
°C
°C
°C
5.0
5.0
5.0
Differential of temperature (T1-T2) to turn on the pump
While the solar collectors receive energy, the sensor 1 temperature will increase. When this
temperature is higher then the sensor S2 temperature, the pump is turned on and circles down the
heated water, storing in the thermal reservoir, for example.
Differential of temperature (T1-T2) to turn off the pump
With the pump on, the hot water circles down and the cold water circle up. Then the diference between
S1 and S2 temperature tends to decrease.
When the temperature decreases to a determined value, the pump is turned off, stopping the water
circulation.
Temperature of anti-freeze (S1) in the collectors to turn off the pump
When the collectors temperature (sensor S1) is low (winter nights, ex.), the pump is turned on,
periodically, to avoid water from freezing in the hoses. The hysteresis is fixed in 5°C.
To disable this function set the adjustment to the minimum until appears .
Overheating temperature (S1) to turn the pump off
When temperature in collectors (sensor S1) will be above of a determinable value, the pump is turned off
to hinder that the overheated water circulates for the pipes and it damages them (case PVC pipes are
used). The fixed hysteresis is in 2°C.
Overheating temperature (S2) to turn the pump off
When the temperature in sensor S2 reaches a determinable value, the pump is turned off to prevent
thermal discomfort . This function is used in heating systems for pools that do not use the third sensor.
The hysteresis can be adjusted from 0,1 to 5,0 °C. (See function ).
Overheating temperature (S3) to turn the pump off
When the temperature in sensor S3 reaches a determinable value, the pump is turned off to prevent the
thermal discomfort. This function is used in heating systems for pools that use the third sensor to
measure temperature in surface. The hysteresis can be adjusted from 0,1 to 5,0 °C. (See function
).
Note:
This function also serves to disable sensor S3 (when it is not used), being enough to dislocate the
adjustment for maximum until appearing the indication .
Cooling
This function only appears if S3 sensor will be qualified. It has the purpose to cool the pool during the
night always that overheating temperature of this sensor will be exceeded and the difference of
temperature between S1 and S2 to reach -4°C. Then the pump is turned on using the collector as
radiator to coll the water of pool.
When the difference (S1-S2) lower or the temperature in the S3 sensor to reset overheating, the pump
is off.
Overheating temperature hysteresis of S2 and S3 sensors
Case the pump will be off for overheating in sensors S2 or S3, through these functions a time
interval can be defined where the pump will keep off.
Indication locking of sensors (S1, S2, S3)
It allows to compensate eventual shunting lines in the reading of sensors S1 (collectors), S2
(reservoir) and S3 (surface), proceeding from the exchange of the sensor or alteration of cable
lenght. (It only can be visualized if third sensor will be qualified).
PS:
To disable the third sensor see explanation in the function .
IMPORTANT:
The adjusted value in the function must be bigger than the value adjusted in
the function . Thus being,
MICROSOL Ri
does not allow that invalid adjustments are made
similar to guarantee its perfect functioning.
Ex.: Current configuration
You want to change for
{
10.0°C
5.0°C
{
4.0°C
2.0°C
First adjust for 2.0°C and after soon adjust for 4.0°C.
4. SIGNALLING
PUMP
signal the pump status.
T1
and
T2 i
ndicate which temperature
is being displayed.
While programming, parameters T1 and T2 keep blinking.
If the sensors are disconected or out of the specified range, a message will appear on the display,
indicating the sensor.
Sensor 1 irregular
Sensor 2 irregular
Sensor 3 irregular
If the instrument shows in the display the message , it means that was detected some parameter
value outside the acceptable range and it needs to be corrected.
Sensor 1
Sensor 2
Sensor 3
Differential S1-S2
T1
T2
Indication
6.
WIRING DIAGRAM
Note:
The sensors cables length can be increased by the user until 200 meters using the PP 2 x 24 AWG
cable. For immersion in water use thermometric well.
1
2
4
5
6
7
8
9
10
11
12
3
1
2
4
5
6
7
8
9
10
11
12
3
S
en
so
r 1
B
la
ck c
ab
le
(
co
lle
ct
or
s)
S
en
so
r 2
G
ra
y c
ab
le
(r
es
er
vo
ir/
po
ol
)
*S
en
so
r 3
(s
ur
fa
ce
)
7 - 8
7 - 9
MICROSOL Ri
115V
230V
Load
COMMON
NO
NC
PUMP
MICROSOL RiL
12V
24V
72 mm
Tear dimensions
to position the instrument
in the panel
29 mm
Power
supply
Load
supply
Above the current specified
use contactor
0
115V
(12V )
230V
(24V )
*Sensor 3 sold separately
5. PARAMETER WITH EASY ACCESS
The setting, if enabled by the user, can be easily accessed by a quick touch on key.
To enable the easy access mode press for 15 seconds until appears or .
The default mode from factory is “disabled”. When used in swimming pools this parameter allows setting
the water temperature to turn off the circulation pump, avoiding thermal discomfort.
SET
SET
MCSOLRi6-05T
-1
1020
E251415