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
48
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
MR
Max Reset
AS
Active Setpoint
LWT SP
LWT Setpoint
Signal
4-20 mA Analog input singal
Setpoint Reset by Evaporator Return Temperature
The active setpoint is calculated applying a correction that depends on the evaporator entering
(return) water temperature
If the unit works in heat pump mode with water inversion the correction depends on the condenser
entering (return) water temperature (W/C only).
When the evaporator/condenser
ΔT becomes lower than the SRΔT value, an offset to the LWT
setpoint is increasingly applied, up to the MR value when the
ΔT is equal to zero
The Return Reset may affect negatively the chiller operation when operated with variable
flow. Avoid to use this strategy in case of inverter water flow control.
Setpoint Reset by Outside Air Temperature (OAT) (A/C only)
The active setpoint is calculated applying a correction that depends on the outside air temperature.
MR
Max Reset
AS
Active Setpoint
SR
T
Start Reset DT
LWT SP
LWT Target
4mA
20mA
Signal
AS
LWT SP
LWT SP - MR
MR
Heat Mode
4mA
20mA
Signal
AS
LWT SP
LWT SP + MR
MR
Cool Mode
0
SR
T
AS
LWT SP
LWT SP - MR
MR
Heat Mode
SR
T
Evap
T
AS
LWT SP
LWT SP + MR
MR
Cool Mode
Evap
T
Cond
T
0
