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
10
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
1.6 Abbreviations used
In this manual, the refrigeration circuits are called circuit #1 and circuit #2.
The following abbreviations are used frequently:
UC
Unit controller
HMI
Human Machine Interface
A/C
Air Cooled
W/C
Water Cooled
C/O
Cooling Only
H/P
Heat Pump
CL
Condenser Less
CP
Condensing Pressure
EP
Evaporating Pressure
CSRT Condensing Saturated Refrigerant Temperature
ESRT
Evaporating Saturated Refrigerant Temperature
ST
Suction Temperature
SSH
Suction SuperHeat
EXV
Electronic Expansion Valve
ELWT Evaporator Leaving Water Temperature
EEWT Evaporator Entering Water Temperature
CLWT Condenser Leaving Water Temperature
CEWT Condenser Entering Water Temperature
1.7 Customer Terminal Block Connections
1.7.1 Connections description and purpouse
The contacts below are available at the user’s terminal block referred as MC24 or MC230 in the
wiring diagram. The following table summarizes
the connections at the user’s terminal block.
Description
Terminals
Notes
Evaporator Flow Switch (mandatory)
724, 708
For potential-free contacts
Sampling voltage / current DC 24 V / 8 mA
Condenser
Flow
Switch
(W/C
mandatory)
794, 793
For potential-free contacts
Sampling voltage / current DC 24 V / 8 mA
Cooling/Heating Remote switch (H/P
units only)
743,744
For potential-free contacts
Sampling voltage / current DC 24 V / 8 mA
Double setpoint
713,709
For potential-free contacts
Sampling voltage / current DC 24 V / 8 mA
External Fault
884, 885
For potential-free contacts
Sampling voltage / current DC 24 V / 8 mA
On-Off Remote
741, 742
For potential-free contacts
Sampling voltage / current DC 24 V / 8 mA
General Alarm
525, 526
NO digital output (
24…230 Vac ext supply)
Evaporator Pump #1 start
527,528
NO digital output (
24…230 Vac ext supply)
Evaporator Pump #2 start (A/C only)
530, 531
NO digital output (
24…230 Vac ext supply)
Evaporator Pump #2 start (W/C only)
893,894
NO digital output (24 Vdc - 25mA )
