9
Installation
Indications,
functions and options
Operation and function
en
System 2 (weather-compensated heating – flow temperature controlled cooling)
R2 = open
R3 = closed
Flow
Return
R1
S2
S1
The controller monitors the room thermostat (TA).
If the room thermostat demands heat, the pump (R1) starts and R4 is energised for
the heating demand. The temperature at S2 is monitored.
The controller calculates the set flow temperature by means of the outdoor tem-
perature (S1) and the selected heating curve. The mixer is controlled so that the
calculated set flow temperature is reached and maintained at S2.
The controller is equipped with a non-adjustable safety shutdown function. If the
temperature at S2 reaches or exceeds 90 °C, the mixer closes. The warning symbol
⚠
appears on the screen and the Lightwheel
®
flashes yellow. If the temperature
at S2 reaches or exceeds 95 °C,R1 and R4 switch off. The Lightwheel
®
flashes red.
If theTMax option is activated, the value for the safety shutown function can be
reduced. If the temperature at S2 exceeds TMax by less than 5K, the warning symbol
⚠
appears on the screen and the Lightwheel
®
flashes yellow. If the temperature at S2
exceeds TMax by more than 5 K, R1 and R4 switch off. The Lightwheel
®
flashes red.
If the Cooling option is activated, the mixer is controlled so that the adjusted
cooling temperature TCool is reached and maintained at S2. The S7 contact can be
used for connecting a switch for remotely controlling the heating / cooling mode.
Contact open = cooling mode
Contact closed = heating mode
If the Condensation option is activated, the controller monitors a dew point
switch. If the dew point switch triggers an alarm, cooling stops and the warning
symbol is indicated.
Terminal allocation
S1
= outdoor temperature sensor
S2
= heating circuit flow
S3/RTA12 = return sensor or remote control (optional)
TA
= room thermostat
S5/TS10 = dew point switch (optional)
S6
= RPS Grundfos Direct Sensor™ pressure sensor (optional)
S7
= contact for remotely controlling the heating / cooling mode (optional)
R1
= pump
R2
= mixer open
R3
= mixer closed
R4
= demand contact of the heat generator (potential-free extra-low volt-
age relay). If the voltage at the contact used is higher than 30 V, use the
auxiliary terminals at the 230 V side for the mixer.
PWM 1 = R1 speed signal, profile selectable
Adjustment and balance values menu system 2
Factory
setting
Range
Description
System
1
1, 2
System selection
Curve
0.8
0.3 … 3.0
Heating curve
TMin
Yes
Yes, No
Minimum temperature heating circuit option
TMin
25 °C
15 °C … 40 °C
Minimum temperature heating circuit
TMax
Yes
Yes, No
Maximum temperature heating circuit option
TMax
50 °C
30 °C … 90 °C
Maximum temperature heating circuit
Remote control No
Yes, No
Remote control option
Cooling
No
Yes, No
Cooling option
TCool
16 °C
5 °C … 25 °C
Cooling temperature
Condensat.
Yes
Yes, No
Dew point switch (DPS) option
Chiller on
No
Yes, No
Cooling demand on option
Pressure
No
Yes, No
Low pressure monitoring option
PMin
0.6 bar
0.2 … 10.0 bar
Switch-on threshold low pressure monitoring
tMixer
75 s
30 … 240 s
Mixer runtime
