V
W
SEL
PRG
mute
reverse direct
Display
Decimal point
LED reverse
LED direct
Sensor SEL
Sensor PRG / MUTE
Up
Down
Description of the controller
Display: During normal operation display indicates value measured by sensor. In case of alarm measured value and alarm code
are indicated alternately. Parameter is indicated during programming process.
Decimal point: Indication of decimal value.
REVERSE: LED for Reverse flashes if at least one relay with this function was activated. Number of flash signals indicates number
of relays activated with Reverse. Flash signals are interrupted by a pause of 2 seconds.
DIRECT: LED for Direct flashes if at least one relay with this function was activated.
SEL-key: SEL indicates and chooses set-point.
“PRG/MUTE“-key: In case of alarm signal buzzer is switched off by means of PRG/Mute-key.
“Up“-key: Use UP-key to enlarge set-point or parameter values.
“Down-key“: Use DOWN- key to reduce se- point or parameter values. If measured value is indicated by sensor 1 measured value
of sensor 2 ( if existant ) can be indicated on NTC input version by pressing Down-key.
Adjustment of controller by manufacturer
Switching stages adjusted by manufacturer:
Stage 1: Set point ST1 is set on 20° C by factory. Relay switches on cooler as soon as set temperature is exceeded.
Stage 2: Relay switches on heating as soon as set temperature is to low.
Indication on display
During normal operation display indicates actual values measured by sensor of medium.
Temperature adjustment of the medium
Set-point: 1. Press key SEL for approx. 5 seconds. Indicaiton Display: „ST 1“
2. Let go SEL-key. Indication Display: Set-point 1
3. Use keys UP and DOWN to adjust Set-point 1.
4. Press SEL-key. Indication Display: „ST 2“
5. Press SEL-key to return to operation mode.
Parameter Set point Description
ST1 120°C Set-point: cooling
Can be changed within limitations given by factory ( -10 at 25°C )
ST2 Set-point: heating
Can be changed within limitations given by factory ( -10 at 40°C )
Maximum temperature of the medium is limited on 40° C by controller.
Hysteresis: Hysteresis is set by manufacturer and must not be changed by customer.
Correction of failures
Indication Description Cause Correction
Er0 Failure: Sensor Sensor cable broken or short-circuited
Connection failure
Sensor defective
Check connections between sensor and
thermostat
Check sensor signal NTC = 10 kΩ at tem-
perature of 25°C
Er1 (NTC) Failure: Sensor NTC 2 As described for Er0, only for room sen-
sor
As described for Er0, only for NTC 2
Er2 Failure : Store Current supply interrupted during pro-
gramming process (indication of alarm)
In case failure is not corrected, exchange
unit
Er4 Alarm „HIGH“ Temperature of medium exceeds +42° C Temperature of medium too high
Er5 Alarm „LOW“ Temperature of medium below -12° C Temperature of medium too low
Attention:
In case of failure, acoustic signal and indication of failure must be reset by means of key PRG (Annotation: indication of failure dis-
appears only if failure is corrected). Delay of alarm (Mode 5 only) is reset automatically if reason for alarm is not given any more.
Manual resetting may be required for parameters P27 (Er4 and Er5) and C29 (Er3) only (see technical instruction). In case of failure
indication: Er0, Er1 and Er2 normal function of the controller is restored again as soon as the reason for failure indication is not gi-
ven any more.
Adjustment of the water
flow temperature
Set value controlled
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