Operating Procedures
ARTC-SVX002A-EN
35
When an I/O screen is displayed, switching to other I/O
screens is accomplished by pressing their respective
buttons:
The ANALOG button displays the analog screen.
The DIGITAL button displays the digital screen.
Analog Inputs
Analog input (AI) data includes these parameters:
AI1
This input indicates suction pressure.
AI2
This input indicates discharge pressure.
AI3, AI4
These inputs indicate the evaporator inlet or outlet
temperatures
AI5, AI6
These inputs indicate the condenser inlet or outlet
temperatures
AI7, AI8
These inputs indicate the inlet or outlet chilled water
temperatures. This applies to Cooling Mode.
AI9, AI10
These inputs indicate the inlet or outlet hot water
temperatures. This applies to Heating Mode.
AI11
These inputs indicate the panel temperature (optional).
This applies to Heating Mode. It is used when temperature
control inside control panel is required either heating (for
cold environment) or cooling (for hot environment).
Analog Outputs
Analog output (AO) data includes these parameters:
AO1
These outputs indicates condenser isolation valve
position.
AO3
These outputs indicate the evaporator’s isolation valve
position.
AO4
These outputs indicate the evaporator’s flow demand
hard-wired signal for BAS.
AO5
These outputs indicate the variable speed compressor’s
hard-wired control signal.
Digital Inputs
Digital input (DI) data includes these parameters:
Digital LEDs
There is an LED for each digital input that indicates its
current state. For all inputs, the color of the LED signifies
its current state:
Green LED.
This digital input is energized, the connected
device is closed.
Gray LED.
This digital input is de-energized, the
connected device is open.
DI1 Remote On/Off
This activates a module on or off via digital input. If the
client digital on-off input is enabled, toggling the
DI1
on
the client module will turn the entire chiller/heater on or
off.
DI2, DI3
These show the Discharge / Suction Pressure switches of
Circuit 1. DI closed - pressure is in the normal range; DI
opened - pressure is exceeding normal range threshold
(faulty state).
DI4
These show the state of Evaporator flow switch. DI closed
- flow present; DI opened - flow absent.
DI7
These show the state of Condenser flow switch. DI closed
- flow present; DI opened - flow absent
DI8 Phase Monitor
This is feedback for the three-phase power supply
protection feature. If the digital input for this switch
indicates closed, there are no power supply issues. If the
digital input for this switch indicates open, a power supply
failure has been detected.
If common power supply protection module is used for the
chiller, its failure will affect each module. In such a case this
DI is optional for Server Module.
DI9
This is the feedback for Pump-down pressure switch of
Circuit 1. DI closed - pressure is in the normal range; DI
