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Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
47/84
5.2.6
High Water Temperature Limit (A/C units only)
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. 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
Wait until the water temperature drops
below 25°C
5.2.7
Low Evaporating Pressure
When the circuit is running and the evaporating pressure drops below the safety limits (see section 4.12.1) 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 6.6.18 to troubleshoot this problem.
Is the circuit required to start?
Valve preopening
Compressor start
Adjust capacity
Is a capacity adjustment required or is a preventive logic active?
N
N
Wait thermostat command
Shutdown signal for thermostat or alarm?
Pumpdown of circuit then switch compressor off
N