EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-G 075
- 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
Operation Manual
38
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Pa
Low Press Hold=
670.0k
Pa
150.0…793.0kPa
Low pressure hold limit
Low Press Unld =
650.0
KPa
150.0…793.0kPa
Low pressure unload limit
Hi Press Unld=
3850k
Pa
3800…3980kPa
High pressure unload limit
Hi Press Stop=
4000k
Pa
3900…4300kPa
High pressure alarm limit
Evap Water Frz=
2.0°C
2.0
…5.6°C (without
Glycol)
-
20.0…5.6°C (with
Glycol)
Evaporator freeze protection limit
Cond water Frz=
2.0°C
2.0…5.6°C (without
Glycol)
-
20.0…5.6°C (with
Glycol
Condenser freeze protection limit (W/C only)
Flw Proof=
5s
5…15s
Flow proof delay
Evp Rec Timeout=
3min
1…10min
Recirculating timeout before the alarm is raised
Low OAT Strt Time
165se
c
150…240s
Start time during which the low pressure alarm is ignored.
Min Delta Pres=
400.0k
Pa
50…700kPa
Minimum pressure difference to trigger the Low Delta Pressure alarm
Once tripped, the software will get back to normal operation. However, the alarm will not be reset
until the high pressure switches are manually reset through the button included in the switch.
4.9.3 Calibrate Unit Sensors
This page allows a proper calibration of the unit sensors.
Setpoint/Sub-Menu
Default
Range
Description
Evap LWT=
7.0°C
Evaporator LWT current reading (includes the offset)
Evp LWT Offset=
0.0°C
-
5.0…5.0°C
Evaporator LWT calibration
Evap EWT=
12.0°C
Evaporator EWT current reading (includes the offset)
Evp EWT Offset=
0.0°C
-
5.0…5.0°C
Evaporator EWT calibration
Cond LWT =
35°C
Condenser LWT current reading (includes the offset) (W/C only)
Cond Lwt Offset=
0.0°C
-
5.0…5.0°C
Condenser LWT calibration (W/C only)
Cond EWT=
30.0°C
Condenser EWT current reading (includes the offset) (W/C only)
Cond EWT Offset=
0.0°C
-
5.0…5.0°C
Condenser EWT calibration (W/C only)
OA Temp=
30.0°C
Oustide Air Temperature current reading (includes the offset) (A/C only)
OA Temp Offset=
0.0°C
-
5.0…5.0°C
Oustide Air Temperature calibration (A/C only)
4.9.4 Calibrate Circuit Sensors
This page allows a proper calibration of the circuit sensors
Setpoint/Sub-Menu
Default
Range
Description
Evap Pressure=
Evaporator Pressure current reading (includes the offset)
Evp Pr Offset=
0.0kPa
-
100.0…100.0kPa
Evaporator Pressure offset
Cond Pressure=
Condenser Pressure current reading (includes the offset)
Cnd Pr Offset=
0.0kPa
-
100.0…100.0kPa
Condenser Pressure offset
Suction Temp=
Suction Temperature current reading (includes the offset)
Suction Offset=
0.0°C
-
5.0…5.0°C
Suction Temperature offset
Discharge Temp=
Discharge Temperature current reading (includes the offset) (A/C only)
Discharge Offset=
0.0°C
-
5.0…5.0°C
Discharge Temperature offset (A/C only)
Calibrations of the Evaporator Pressure and Suction Temperature are mandatory for the
applications with negative water temperature setpoints. These calibrations have to be performed
with proper gauge and thermometer.
An improper calibration of the two instruments may generate limitation of the operations, alarms
and even damages to components.
