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4.2.5 Circuit Preventions
4.2.5.1 High Water Temperature Limit
The only prevention that can activate at unit level will limit the maximum unit capacity to 80% when the leaving water
temperature exceeds 25 °C in cooling or 60 °C in heating. This condition will be displayed at circuit level to indicate the
capacity limitation.
Symptom
Cause
Solution
Unit maximum capacity equal to 80%
Leaving Evaporator water
temperature higher than 25 °C or
Leaving Condenser water
temperature higher than 60 °C
Wait until the water temperature drops
below 25 °C
4.2.5.2 Low Evaporating Pressure
When the circuit is running and the evaporating pressure drops below the safety limits the circuit control logic reacts at two
different levels in order to recover the normal running conditions.
If the evaporating pressure drops below the Low Pressure Hold limit, compressor is inhibited to increase its running
capacity. This condition is indicated on the controller display in the circuit status as “Run: Evap Press Low”. The status is
automatically cleared when the evaporating pressure rise above the Low Pressure Hold limit by 14 kPa.
If the evaporating pressure drops below the Low Pressure Unld limit, compressor is unloaded in order to recover the normal
operating conditions. This condition is indicated on the controller display in the circuit status as “Run: Evap Press Low”.
The status is automatically cleared when the evaporating pressure rise above the Low Pressure Hold limit by 14 kPa.
See section 5.6.18 to troubleshoot this problem.
4.2.5.3 High Condensing Pressure
When the circuit is running and the condensing pressure rises above the safety limits the circuit control logic reacts at two
different levels in order to recover the normal running conditions.
The two different levels, called High Pressure Hold and High Pressure Unload limits, are calculated by the controller from
the maximum condenser pressure allowed by the compressor envelope. This value depends from evaporating pressure
as reported in the figure below.
If the condensing pressure rises above the High Pressure Hold limit, compressor is inhibited to increase its running
capacity. This condition is indicated on the controller display in the circuit status as “Run: Cond Press High”. The limit is
calculated in terms of saturated condensing temperature; the status is automatically cleared when the saturated
condensing temperature rises above the High Pressure Hold limit by 5.6 °C.
If the condensing pressure rises above the High Pressure Unload limit, compressor is unloaded in order to recover the
normal operating conditions. This condition is indicated on the controller display in the circuit status as “Run: Cond Press
High”. The status is automatically cleared when the saturated condensing temperature rises above the High Pressure Hold
limit by 5.6 °C. See section 5.6.17 to troubleshoot this problem.
4.2.5.4 High Vfd Current
When the compressor is running and its output current rises above the safety limits the circuit control logic reacts at two
different levels in order to recover the normal running conditions. Safety limits are calculated by the controller based on
the selected compressor type.
Safe Operation Area
Evap. Sat. Temp.
Cond. Sat.
Temp.
Hi Press Trip
Hi Press Hold
Hi Press Unload
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Productinformatie
| Merk | Daikin |
| Model | EWYS5004Z |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 7564 MB |
