Differential temperature controller for automation of solar heating systems,
MICROSOL II plus
becomes simple the management of the temperature of the water in the thermal reservoirs and
swimmingpools,use thesolarenergybetter..
Itactsinthecommand ofthewatercirculationpumpthrough the differentialoftemperaturebetweenthe
solarcollectors and the thermal reservoir orswimmingpool.It is a dedicated instrument thathasall its
parametersofconfiguration protectedbyaccesscode.
It makes use of two solar backings outputs, that can be electric, gas, diesel or also to program the
filteringoftheswimmingpool. solar backing1istiedwithan schedule thatallowstheconfigurationofup
to four daily events for each day of the week and solar backing 2 can optionally be configured for
functioninginset withtheschedule.
Ithasfunctions that prevent the water freezing and overheating inthetubingsanda clock with internal
batterytoguarantee itssynchronism,evenintheenergylack,permanyyears.Theinstrument hasserial
communicationforconnection withtheSITRAD viaInternet.
Pressandsimultaneously for two seconds until it appears, then releasing it. When
appearspress(tap) and enter thecode (123) through keysand.Toconfirm,
pressthekey.Throughthekeysandaccessthe otherfunctionsandproceedin thesame
manner to adjust them. Toleavethe menu andreturn to normal operations, press(longhit) until
Thisfunctionallowstheadjustmentofthedifferentialtemperature(S1-S2)to activate the water circulation
pump. As the solar collectors receive energy, the temperature in sensor S1 increases. When this
temperatureisatavalueestablishedasbeing above the temperature ofsensorS2,thepumpisturnedon
andcirculatesunderthe heatedwater,storingit inthereservoir,for example.
Differentialforturningoff thewatercirculationpump
Thisfunctionallows the adjustment of the differentialtemperature(S1-S2)toturn off the water circulation
pump. With the pump on, the hot water circulates below and cools upwards. After which time, the
temperaturedifferencebetweenS1and S2 tendstodecrease.Whenthisdifferencefalls to anestablished
level,thepumpis turnedoffandthewater circulationstops.
Minimumtimeforthe pumpoff
Thisfunctionallowsthe adjustmentoftheminimumtimeoff thatthepumpshouldhave beforebeingturned
on again. This option avoids the pump from being turned on and off in short periods of time, which thus
increasestheusefullifethereof.Thisfunctionalsodefinesthe delay in the pump's activation onturningon
thecontroller.
Temperatureof the antifreezeforsensor1 to turnthewatercirculationpump on
Thisfunctionallowsadjustmenttothetemperatureforformingice in the collectors. When thetemperature
in the collectors (sensor 1) are very low (Ex.: winter nights), the pump is turned on from time to time, to
prevent the water from freezing in the pipes and damaging them. The hysteresis is set at 2°C/4°F.To
deactivatethisfunctiondecrease thevalueuntilthemessageappearsinthedisplay.
This function allows the adjustment of the overheating temperature of the collectors, to turn off the water
circulation pump. When the temperature in the collectors (sensor 1) is above an established value, the
pumpisturnedofftokeeptheoverheatedwaterfromcirculatingthroughthepipesanddamagingthem(if
PVCpipesareused).
Ifyoudonotneed to usethefourevents,youcan configure ittobedeactivated,andallyou havetodois
increase the off time (for example) until theindication appears. It is also possible to
configureaneventtooverlap that itbeginsinonedayandit finishes intheother,andforthatyoushould
increasetheofftimeuntiltheoptionappearsandadjustaneventforthenextdaytostartat00h
and00min.According to the operating mode configured, the following schedulingpossibilities may be
presented.
4.2.5 - Adjustmentof the currenttimeand day of the week
Pressthekeyuntilthe messageappearsinthe visor.
SET
Hitkey.Thesettingswillappearinthefollowingorder:
HOURS MINUTES DAYOFTHEWEEK
Ex.:12h43min- Friday
Hours
Minutes
Dayofthe week
5.FUNCTIONS WHIT FACILITATEDACCESS
5.1- Visualize othertemperatures
To alternate between viewing the temperature of sensor 1, sensor 2, sensor 3 or the temperature
differencebetweensensor1 and2(differentialtemperature),pressuntil thedesiredtemperatureis
showninthe display:
Thetemperatureselectedwillbeshowninthedisplayfor fifteen seconds, and after that periodoftimehas
ended,thepreferentialindication willbeshownagain(as adjustedintheparameter).
5.2- Visualize thecurrent time
Quickly pressing thekey, you can visualize the time set in the controller, the current time will be
Pressingthekey,youcanvisualize the maximumandminimumtemperaturesforeach sensor,aswell
asthe minimum and maximumtemperaturedifferential. On pressing key(shorttouch), the message
will be shownshowing the temperature of sensor 1 and soon after its minimum and maximum
temperatures,andthenthetemperaturesofsensor2(),ofsensor3()andthedifferential
().
Ifkeyremainspressed,the values shall be restarted and the messageshallbeshownon the
display.
5.4 - Set the operating tempera tures of the solar backings
(SETPOINTS)
Pressingthekeyfortwosecondsmay adjusttheoperatingtemperatureforsolar backing 1andsolar
backing 2, as well as the overheating temperature for sensor 2 (reservoir/pool). A message will be
displayed,adjusttheoperatingtemperature forsolarbacking1using keyse,press
toconfirm.Thenthemessagewillbedisplayed,adjusttheoperatingtemperatureforsolarbacking
2,pursuanttowhatisdescribedabove.After pressingthekey, the messagewillbedisplayed
toadjusttheoverheated temperatureforsensor2.
SET
SET
SET
5.5 - Manualactivation of solar backing 1
Pressing the keyfor ten seconds manually activates the output for solar backing 1. This will be
deactivated after the time adjusted in the function.lapses. By pressing keyagain for 10
seconds,themanual activationisdisabled,and solarbacking1resumes automaticoperation.
Todeactivatethemanualactivation, allyouhaveto doisconfigurefunctionwiththevalue“ 000”.
5.6- Manual activation of the watercirculationpump
By pressing keyfor 10 seconds, one can choose the mode of operation of the water circulation
pump.Afterpressing the key,themessagewillbedisplayedandtheuser may thenchoosefromthe
optionslistedbelow,usingkeysand:
Circulationpumpalways off
Circulationpumpalways on
Circulation pump operating in automatic mode without sensor 3 temperature validation. In this
modethecirculation pumpwillbeactivated onlybythediferential oftemperature(S1-S2)
Circulation pump operating in automatic mode with sensor 3 temperature validation. In this
mode the circulation pump will be activated by the diferential of temperature (S1-S2) and
whenthetemperature atsensor1is biggerthanatsensor 3.
Confirmtheselectionbypressingkey. The messagewillbedisplayed,showingtheendof
thefunction.
SET
5.7- Disabling thetemperature sensor 3
To disable the solar backing`s temperature sensor (sensor 3) enter the functions menu and access
function.Afterenteringthe functionpressthebuttonuntilthemessageappearsinthe
display,press thekeytoconfirmandexit.
Whenthesensor 3isdisabledthe solarbackings1and 2willbecontrolledbysensor2(reservoir/pool).
If the circulation pump is adjusted for operation with sensor 3 validation and the sensor 3 was
deactivatedthecontroller willautomaticallydisablethe validation.
SET
6.SIGNALING
Sensor1(collectors) disconnectedoroutof range
Sensor2(reservoir /pool)disconnectedorout ofrange
Sensor3(solar backings)disconnectedorout ofrange
Temperatureforsensor1is freezing
Temperatureforsensor1is overheated
Temperatureforsensor2is overheated
Configurationparametersnot programmedoroutof range
Circulationpumpin offmanualmode
Circulationpumpin onmanualmode
7.UNIT SELECTION (°C /°F)
Todefine the unit that the system will use to operate, enter into the functions menuusingthe
access code “231” and confirm it by hitting key. The indicationwill appear,pressor
messagewillappear,andtheinstrument will return to the function. Whenevertheunitisaltered,
theparametersshould bereconfigured,sincethey assume”standard”values.
IMPORTANT
Accordingtothe chaptersofnormIEC 60364:
1:
Installonthepower supply.
protectoragainstovervoltage
2:
Sensorcablesandsignalcables of the computer may be joined, but not in thesameelectricconduit
Install transient suppresors (RC filters) parallel to the loads as to increase the product life of the
relays.
For more information,pleasecontactourTechnical Support by e-mail:or by
support@fullgauge.com
phone +5551 3475.3308.
Schematic for the connection of supresors
to contactors
A1
Suppresor
A1 andA2arethe
contactor coil terminals.
A2
Schematic for the connection of supresors to
direct activation loads
For direct activation themaximum
Load
specified current should betaken
Suppresor
into consideration.
PROTECTIVE VINYL:
This adhesive vinyl (included inside the packing) protects the instruments against
waterdrippings,as incommercialrefrigerators,for example.
Dotheapplication afterfinishingtheelectrical connections.
Remove the protective paper
andapplythevinyl on theentire
superior part of the device,
foldingtheflapsasindicatedby
thearrows.
8.WIRING DIAGRAM
9
230V
7
7
115V
Power
supply
9
8
8
10
10
PUMP
0
COMMON
Pump
Load 1
Above thecurrentspecified
use contactor
12
12
11
11
AUX1
AUX2
Load 2
Teardimensions
to position the instrument
Loads
supply
in the panel
72 mm
1
1
2
2
A
B
RS-485
Serial communication
Totheterminal of
the distributionbox
MICROSOLIIplus
9-8
9-7
3
3
Sensor 1
(collectors)
115V
230V
4
4
Sensor 2
(reservoir/pool)
5
5
6
6
Sensor 3
(solar backings)
Note: The sensor cable length can be increased by the user until 200 meters using PP 2 x 24 AWG
cable.
Integrating Controllers, RS-485 Serial Interface and Computer
®
External
mesh
Serial interface
RS-485
Full Gauge
terminal
grounded
RS-485SerialInterface
Device used to establish the
connectionFullGauge Controls’
instrumentswiththeSitrad
RS-485 Network
MOD 64
A
BB
B
A
AB
A
®
.
A
A
BB
B
A
A
BB
B
A
Instrument
Distribution Box
Usedtoconnectmorethan oneinstrument totheInterface.Thewire'sconnectionsmust
bemadein agreementwiththe followingrules:terminal oftheinstrument connectsto
theterminal of the distributionbox,thatmust be connectedwiththe terminal ofthe
Interface.Repeattheactionforterminals and , being thecableshield.
Theterminal ofdistributionbox mustbeconnected totherespective terminals of
eachinstrument.
A
B
MR
OUT4
L
A
OUT1
OUT2
3
T
OU
s
lu
p
R
0
0
-4
T
C
P
AA
RS-485 Network
A
A
BB
B
A
A
B
A
MP
U
P
s
lu
p
II
L
O
S
O
R
IC
M
X1
U
A
X
U
A
A
BB
2
A
B
A
A
B
A
B
29 mm
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