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6.10. Low ambient temperature start
Units working in cooling, cooling/glycol or ice mode has to manage start-up with low
outside ambient temperature
A low OAT start is initiated if, at the compressor start up, the condenser saturated
temperature is less than 15.5 °C (60 F).
Once this happens, 3 seconds after the end compressor startup procedure (end of prepurge
cycles) low pressure events are disabled for a time equal to the low OAT time (setpoint has an
adjustable range from 20 to 120seconds, defaults 120 sec.).
The absolute low pressure limit (the threshold which has no time delay) is still enforced. If
this limit pressure is reached a Low Ambient Start-Up low pressure alarm is issued.
At the end of the low OAT start, the evaporator pressure is checked. If the pressure is
greater than or equal to the evaporator pressure stage down setpoint, the start is considered
successful. If the pressure is less than this, the start is not successful and the compressor shall stop.
Three start attempts are allowed before tripping on the restart alarm.
The restart counter should be reset when either a start is successful or the circuit is off on an
alarm.
6.11. Compressors and unit trips
6.11.1.
Unit trips
Unit trips are caused by:
•
Low evaporator flow rate
A “Low evaporator flow rate alarm” will trip the whole unit if the evaporator flow
switch remains open for more than an adjustable value; the alarm are automatically reset for
three times if the evaporator flow switch closes for more than 30 seconds. Starting from the
fourth alarm it has to be reset manually.
•
Low evaporator outlet temperature
A “Low evaporator outlet temperature alarm” will trip the whole unit as soon as the
evaporator leaving water temperature (evaporator leaving temperature in the case of single
evaporator units or manifold temperature in the case of a double evaporator unit) falls below the
freeze alarm setpoint.
A manual reset of the alarm are required to restart the unit
•
Phase-Voltage Monitor (PVM) or Ground Protection (GPF) failure
A “Bad phase/voltage or Ground protection failure alarm” will trip the whole unit as
soon as the phase monitor switch opens (if a single phase monitor is used) after the unit start
request.
A manual reset of the alarm will required to restart the unit
•
Evaporator leaving water temperature fault
An “Evaporator leaving water temperature fault alarm” will trip the whole unit if the
reading of evaporator leaving water temperature (evaporator leaving temperature in the case of
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Productinformatie
| Merk | Daikin |
| Model | EWAD-BZXS |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 10110 MB |
