EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-
- R410A - Air-cooled scroll chillers
EWAQ-
- R410A - Air-cooled scroll chillers
EWYQ-
- R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
Operation
Manual
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Operation Manual
51
Evap Recirc
Unit is running the evaporator pump to equalize the water temperature in the
evaporator.
Wait For Flow
Unit pump is running but the flow signal still indicate a lack of flow through the
evaporator.
Pumpdn
Unit is shutting down.
Max Pulldn
Unit thermostat control is limiting the unit capacity because the water
temperature is dropping at a rate that could exceed the active setpoint.
Unit Cap Limit
Demand limit has been hit. Unit capacity will not further increase.
High Amb Limit
(A/C only)
Ambient temperature is higher than 46.6°C the unit capacity will be limited to
50% in case of single circuit units.
Defrost
One circuit is performing a defrost procedure
As soon as the unit status turns to Auto, the start sequence is initiated. The start sequence follows
the steps indicated in the simplified flowchart:
5.2.2 Preparing circuits to start
To allow a circuit start up is required to enable the circuit through the parameter Circuit Mode in the
menu 0
The status of the circuit is indicated in the View/Set Circuit
– Circuit #x. The possible status will be
described in the following table.
Overall Status
Status
Description
Off:
Ready
Circuit is off waiting for a stage up signal from thermostat control
Cycle Timer
Circuit is off waiting for the compressor cycle timer to expire
All Comp Disable
Circuit is off, as all compressors are disable
Keypad Disable
Circuit is off by the local or remote HMI. Check with your local maintenance if it
can be enabled.
Alarm
A circuit alarm is active. Check the alarm list to see what is the active alarm
inhibiting the circuit to start and check if the alarm can be cleared. Refer to the
Troubleshooting section before proceeding.
Test Mode
Circuit mode set to Test. This mode is activated to check operability of onboard
circuit actuators and sensors. Check with the local maintenance if the Mode can
be reverted to Enable.
Preopen
EXV prepositioning before compressor starts.
Run:
Pumpdown
Circuit is shutting down because of thermostat control or pumpdown alarm or
because the enable switch has been turned to off.
Normal
Circuit is running within the expected operational conditions.
Evap Press Low
Circuit is running with low evaporator pressure. This could be due to a transitory
condition or a lack of refrigerant. Check with the local maintenance if corrective
actions are required. Circuit is protected by preventive logic.
Cond Press High
Circuit is running with high condenser pressure. This could be due to a transitory
Is there any compressor available?
Start the Pump
Is Flow established?
Star Thermostat control
N
N
