66
If this fault causes more than 3 shutdowns in 24 hours:
- Corresponding circuit shut off.
- Fault output on
- Frost protection fault relay on optional board in On position
- Circuit fault LED on console lit
steady
- Boiler on if P111 = Boiler and heating mode.
- Auxiliary heaters on if P22 = Yes and heating mode.
Display:
Saved in fault memory:
Resetting:
- If the number of faults in 24 hours
≤ 3 → the fault is automatically acknowledged if the temperature rises back above P52 + 6 K.
- If the number of faults in 24 hours > 3
→ the fault is acknowledged if the temperature rises back above P52 + 6 K and
Reset
is pressed on the console.
15.2 Refrigerant frost limit fault on circuits 1 and 2
Frost on the heat exchangers is detected in two ways on most CIAT machines.
- Detection method 1: sensors monitor for deviations in low pressure and in the water outlet temperature. Such deviations indicate that ice has
started to form on the heat exchanger. There is no self-adjusting function; the risk of freezing is immediately handled as a fault. This method of
detection is standard on all CIAT units.
Parameters P58 and P59 are used in this mode of detection. Therefore, the lower their values, the more the frost protection is sensitive.
Display:
This function can be turned off via parameter P115 in order to perform maintenance.
- Detection method 2: frost is detected by a freon sensor on the heat exchanger inlet:
Operation:
- Should the self-adjusting function be insufficient, a fault will occur on the unit when the temperature measured on the freon pipe at the heat
exchanger inlet is at P52 - P53 (measured for 60 seconds).
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:
If this fault causes more than 3 shutdowns in 24 hours:
- Corresponding circuit shut off.
- Fault output on
- Frost protection fault relay on optional board in On position
- Circuit fault LED on console lit
steady
- Boiler on if P111 = Boiler and heating mode.
- Auxiliary heaters if P22 = Yes + heating mode
Display:
Saved in fault memory:
Resetting:
- If the number of faults in 24 hours
≤ 3 → the fault is automatically acknowledged if the temperature rises back above P52 - P53 +10 K.
- If the number of faults in 24 hours > 3
→ the fault is acknowledged if the temperature rises back above P52 - P53 +10 K and
Reset
is pressed on the console.
15.3 HP pressure fault, circuits 1 and 2
Operation:
- Information is sent by the pressure sensors on each circuit. This function prevents manual HP cuts during brief increases in HP during
momentary blockages in the condenser.
- Should the self-adjusting function be insufficient, a fault will occur on the circuit when the pressure measured is at P54.
If this fault causes fewer than 5 shutdowns in 24 hours:
- Corresponding circuit shut off.
- 30 min. time delay (in seconds in test mode).
- Fault output off
- Circuit x HP fault relay on optional board in Off position
- Circuit fault LED on console
flashes.
- The number of faults over a 24 hour period is managed (P308
for circuit 1 and P338 for circuit 2).
C I R C U I T X O F F
W A T E R F R O S T F A U L T
x . W A T E R x F R O S T P R O T .
C I R C U I T X O F F
E X C H . A N T I F R E Z E F A U L T
C I R C X R E F F R O S T F A U L T
x C U T ( S ) I N 2 4 H
C I R C X R E F F R O S T F A U L T
x C U T ( S ) I N 2 4 H
C I R C U I T X O F F
R E F R I G . F R O S T F A U L T
x . R E F R I G . x F R O S T P R O T
Summary of Contents for Magister 2 Series
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