65
Exception: P08 = "SWEP DOUBLE":
The limit is detected by the saturation temperature (LP side), at P52
– P53 for 60 seconds. Normal operation resumes when the saturation
temperature (LP side) rises to a sufficient level.
Display:
14.3 Self-adjusting function: HP pressure limit
Operation:
- Before shutting down after a fault occurs, the unit reduces its power by turning off a stage, or by slowing the compressor to 50 Hz, or by
shutting off Inverter units for 30 minutes.
- The threshold is detected by the HP sensor at P54-P195 and returned to normal operation after 30 minutes.
- This time period becomes 30 seconds in test mode.
This function is turned on on both circuits at the same time.
Display:
Special case of Inverter machines in water heating mode:
If the HP pressure
≥ P54 - P195, the C
ONNECT
2
controller adjusts the control
setpoint
so as not to push the compressors near their limits too often. If necessary, a coil defrosting cycle will be forced on.
14.4 Self-adjusting function: discharge protection, circuit 1 or 2
Operation:
- Before shutting down after a circuit fault occurs, the unit reduces its power for 30 minutes by turning off a stage.
- The threshold is detected by the discharge sensor at value P51 and the stage that was turned off is returned to normal operation after 30 minutes.
- This time period becomes 30 seconds in test mode.
Display:
Special case for reversible machines in water heating mode:
If the discharge circuit temperature
≥ P151, the C
ONNECT
controller adjusts
the control setpoint
so as not to push the compressors near their limits too often.
If necessary, a coil defrosting cycle will be forced on.
14.5 Self-adjusting function: minimum HP, circuit 1 or 2
Operation:
- If the pressure measured by the HP sensor is
≤ P63 for water-to-water units, the controller lowers the circuit‟s power to avoid an excessive
drop in LP. Normal operation is restored at P63 + 1b.
Display:
14.6 Self-adjusting function for high water return temperatures
Operation:
- The water return temperature may be high as the installation warms up in cooling mode. This causes all the compressor stages to turn on
one after the other and can result in HP cuts and unwanted voltage spikes.
- To prevent this, the controller limits the turning-on of the stages if the water inlet temperature on the heat exchanger is higher than P171 as
long as the temperature does not drop below P171-5K.
Display:
15 FAULT FUNCTIONS
15.1 Water frost limit fault on circuits 1 and 2
Operation:
- Should the self-adjusting function be insufficient, a fault will occur on the unit when the temperature measured on the heat exchanger water
outlet is at P52 (measured for 15 seconds, or P52
– 1 K).
If this fault causes fewer than 3 shutdowns in 24 hours:
- Corresponding circuit shut off.
- Circuit fault output off
- Frost protection fault relay on optional board in Off position
- Circuit fault LED on console
flashes
Display:
C X E V A P T . / F R E E Z E L I M . X
U N I T I N P A R T L O A D
C I R C U I T x H P L I M I T
P W R R E D U C T I O N x x m n
C I R C . X D . T E M P L I M I T
P W R R E D U C T I O N x x m n
C I R C . x M I N . H P L I M .
P O W E R R E D U C .
W A T E R R E T U R N T . L I M I T
U N I T P W R R E D U C T I O N
C I R C X H 2 O F R O S T F A U L T
x C U T ( S ) I N 2 4 H
Содержание Magister 2 Series
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