CIAT Magister 2 Series, Установка, Эксплуатация, Пусконаладка, Обслуживание

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16 CONTROLS
16.1 Main control in cooling and heating modes
Definition and principle:
The chilled water and hot water temperatures are measured and compared with the setpoint value. Depending on the result, the compressor
stages are turned on or off. This check is performed on the heat exchanger
‟s water outlet (water supply = PIDτ) or water inlet (water return).
16.1.1 Operating mode selection (P119):
- If P119 = 1 (Cooling)
Cooling only.
- If P119 = 2 (Heating)
Heating only
- If P119 = 3 (Cooling/Heating via console)
The operating mode can be changed only with the machine stopped
(automatic operation control input set to on, On/Off button).
The Heating/Cooling button will be disabled if it is pressed while the machine is running.
- If P119 = 4 (Cooling/Heating via on/off input)
The operating mode can be changed only with the machine stopped
(automatic operation control input set to on, On/Off button).
Attempting to change the operating mode while the machine is running will result in a fault:
. Machine stopped.
. Machine fault relay in On position.
. General fault LED on.
. Initial operating mode LED flashes
Automatic reset:
- Either the machine changes its operating mode if the change is confirmed by pressing On/Off or if the automatic operation control input is
open;
- Or it resumes its initial operating mode if the input is restored to its initial value.
If P119 = 5, the machine switches b etween heating and cooling depending on the outdoor temperature:
- This function is visible only if P2 = reversible air-to-water
- When this function is turned on, the minimum heating limit and the maximum cooling limit (depending on the outdoor temperature) are re-
enabled and are set to the following values:
. For a minimum air temperature of -10°C if P7
≠ I
NVERTER
-20°C if P7 = I
NVERTER
. For a maximum air temperature of 46°C.
However, they can be disabled.
- When an operating mode reaches its end temperature setpoint in automatic mode, the following message is displayed until a mode is turned on:
The two heating and cooling LEDs flash while this message is displayed.
The pump is shut off in the deadband.
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
P 1 3 6 M A X A I R T E M P .
A U T O H E A T I N G M O D E – x x
P 1 3 7 M I N A I R T E M P .
A U T O C O O L I N G M O D E - x x
D E A D B A N D A U T O
H E A T I N G / C O O L I N G
Machine STATUS
HTG
MODE
CLG
MODE
Outdoor
temperature
Machine STATUS