57
9.12 Operating mode selection
If P119 = 4 (cooling/heating via on/off input):
The unit is controlled, during water heating or water chilling, based on the mode selected via the input located:
- Between terminals 5-6 on terminal block J6 on the motherboard
if P2 = water-to-water
- Between terminals 1-2 on terminal block J4 on additional board
1 if P2 = reversible air-to-water, 1 circuit
- Between terminals 1-2 on terminal block J2 of additional board 2
(cycle reversal) if P2 = reversible air-to-water, 2 circuits
The contact must be closed in order to be able to select heating
mode, and it must be open in order to be able to select cooling
mode.
- If P2 = water-to-water, the machine must be shut off via the
On/Off button or the automatic operation control and winter
protection must be shut off before the operating mode may be
changed.
A fault will occur if the operating mode is changed while the machine is running:
- Unit shut off,
- General fault LED on
- LED of initial mode flashes; fault control contact closed (not
stored in fault memory)
Automatic acknowledgment:
- The operating mode changes if the change is confirmed via the
On/Off button or the automatic operation control.
- If the input returns to its original state, the unit resumes its initial
operating mode.
If P2 = reversible air-to-water, the operating mode may be switched with the unit running. After the operating mode is changed, the unit will
stop and restart in its new operating mode and take into account the short-cycle protection.
10 MANAGEMENT OF THE ANALOGUE INPUTS
10.1 Temperature sensor
Diagram of sensors: All sensor faults are taken into account in the fault memory.
Water inlet sensor:
CTN 10 K at 25°C (if P2 = 1, 2 or 3)
This sensor monitors the water temperature on the exchanger inlet in order to:
- Adjust the unit (water return control).
- Monitor the operation of the unit if the water return temperature
is too high (load limiting).
- Display the chilled water or hot water inlet temperature (display
range: -40 to 99°C, resolution: 0.1 K).
- This fault is acknowledged automatically
- Sensor wire cut and short circuit:
In cooling mode:
- Unit shut off, message on LCD, unit fault LED lit steady, fault saved in fault memory, fault relay in On position.
In heating mode:
- Water-to-water unit
→ No effect on control, message on LCD,
unit fault LED flashes, fault saved in fault memory.
- Reversible air-to-water unit and water return control
→ Unit shut
off, message on LCD, unit fault LED lit steady, fault saved in fault
memory, fault relay in On position.
- Reversible air-to-water unit and water return control
→ No effect
on control, message on LCD, unit fault LED flashes, fault saved in
fault memory.
Water outlet sensor on heat exchanger 1:
CTN 10 K at 25°C (if P2 = 1, 2 or 3)
This sensor monitors the water temperature on the exchanger outlet in order to:
- Adjust the unit (to water supply)
→ (P6 = 1) and (P141 = 3 or 4)
and cooling mode or (P02 = 3), (P6 = 1) and (P141 = 3 or 4) and
heating mode
- Enable the frost protection
- Display the water outlet temperature (display range: -40 to
99.9°C, resolution: 0.1 K).
- This fault is acknowledged automatically
- Sensor wire cut and sensor short circuit
→ Fault relay in On position
If this sensor is used for control, the unit is shut off (message from
table 1 in machine status menu shown on LCD, unit fault LED lit
steady, fault saved in fault memory). If heating mode is on: the
electric auxiliary heaters are turned on if possible and the boiler
relay is in the On position if P111 = boiler).
If the sensor is not used for control (i.e. it is used only for the frost
limit), the fault is a circuit fault (message from circuit 1 table in
machine status menu shown on LCD, circuit fault LED lit steady,
fault saved in fault memory).
M A C H I N E O F F
O P E R A T I N G M O D E C H A N G E
E X C H . 1 W A T E R I N L E T
S E N S O R F A U L T J 7 / 2 - 3
E X C H . 1 W A T E R O U T L E T
S E N S O R F A U L T J 7 / 4 - 5
+ 5 V
R = 8.96 k
Ω
50 k
Ω sensor
+ 5 V
R = 15.4 k
Ω
10 k
Ω sensor
Содержание Magister 2 Series
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