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Watts Solar Controller LCD PLUS Manual

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Pump-P1 starts if the temperature difference “dt” between the
collector (T1) and tank1 (T2) is sufficient.
The loading of the tank1 with pump P2 is activated if the
temperature difference “dt” between the external plate heat
exchanger (T4) and the tank1 (T2) is sufficient.
The operation of P1 and P2 pumps is totally independent.
2.4 Outputs configuration
- This menu allows configuration of the specific type of output
and the settings of the device connected to all outputs on the
controller. (E.g.High efficiency or standard pump; with or
without speed control, power relay...etc).
There is also the possibility of using the “free” outputs for an
extra function (Thermostat, Cooling, diffcontrol, antistagnation,
booster...)
Note: The outputs “free”, will be marked “not used”
2.4.1 P1
Main pump output, this output is always used to manage the
solar circuit.
There will be the choice between, High efficiency PWM pump,
standard pump or power relay when large pumps are required.
To change the selected pump press (►) to highlight the line
and select your choice with (+) or (-).
PWM Pump
If a PWM pump is connected, there will be the choice between
the 3 main brands, GRUNDFOS, WILO and LAING.
The speed regulation is done by PWM control "ViH = ~11VDC
ViL = <0,5V VDC" with a signal frequency ~ 250Hz”.
Example of compatibility:
- GRUNDFOS SOLAR PM type.
- WILO STRATOS type.
- LAING ECOCIRC E4 PWM1 type.
It is possible to select in percentage form the minimum and
maximum speed of the pump. (Adjustable from 0 to 100%)
The speed of the pump is variable when the value of dt is
between the range “dtFs” and “dtMin”.
dtFS => dT scale of speed variation.
Speed control of the pumps enables the maximisation of the
energy yield from the collectors.
PWM speed regulation explanation:
Standard Pump
If a standard pump is connected, it is possible to control the
speed of the pump; in this case the speed control is done by
pulse packet function.
It is possible to choose in percent form the minimum and
maximum speed of the pump. (Adjustable 30 to 100%)
The speed of the pump is variable when the value of the dt is
between the range “dtFs” and “dtMin”.
This function is an alternative to the High efficiency pump
(PWM), if it is necessary to optimize the efficiency of the solar
installation a PWM high efficiency pump should be utilized.
If the speed control function is not required, selelct “No Sc” as
choice.
Pulse packet speed regulation explained
Important Note:
As the speed control is done by pulse packet, noise can occur
in the hydraulic circuit, check the compatibility of the hydraulic
circuit (fitting, pipe…) before selecting this form of speed
control.
Relay / Valve
If it is necessary to connect a large pump for solar installation
with a large collector array (i.e.Pump Power is greater that the
maximum rated output of the controller) , it is possible to drive
an external power relay to control the pump.
Note: no speed control function will be available with this type
of output.
2.4.2 P2
Output P2 is marked “used by system”, it will be possible to
modify its characteristics as described for P1 previously.
If the output is used to manage a direction valve (in System 2
and 4), no choice will be available.To change the type of the
pump press (►) to highlight the line and select your choice
with (+) or (-).
P2
P1
System
8
T1
T1 _ _ _°C
T2 _ _ _°C
T4 _ _ _°C
P1 _ _ _ %
P2 _ _ _ %
T2
T4
 Outputs configuration- -
P1 “Used by system”
P2 “not used”
P3 “not used”
 Pump 1 --- -
Type PWM Pump
Speed Control Grundsos
Min rev pump 0%
Max rev pump 100%
dTOF
F
dTON
Max rev pump
Pump startup
Min rev pump
dTFs
dTFs
Controlled
Speed range
0%
Pump startup
Min rev pump
dTOFF
dTON
Max rev pump
Min rev pump
dTFs
dTFs
Controlled
Speed range
30%
100%
 Pump 2 --- -
P2 “Used in system”
Type Std Pump
Speed Control no
… 8 …


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