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Operating Procedures
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.
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 input is energized; the connected
device is closed.
Gray LED — This input is de-energized; the connected
device is open.
Analog Inputs
Analog input (AI) data includes these parameters:
AI1
This input indicates suction pressure Circuit 1.
AI2
This input indicates discharge pressure Circuit 1.
AI3, AI4
These inputs indicate Load Entering/Leaving Water
Temperature.
AI5
This input indicates ambient temperature.
AI7, AI8
These inputs indicate Liquid Line Temperature Circuit 1/2.
AI9, AI10
These inputs indicate Suction/Discharge Pressure Circuit
2.
AI11
This input indicates 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).
AI12
This input indicates Suction Temperature Circuit 1.
Analog Outputs
Analog output (AO) data includes these parameters:
38
AO3
This output indicates Load Isolation Valve position.
AO4
This output indicates the variable speed of Fan Bank 1.
Digital Inputs
Digital input (DI) data includes these parameters:
DI1
Remote On/Off – This activates a module on or off via
digital input. If the primary on-off input is enabled, toggling
the DI1 on the primary module will turn the entire heat
pump on or off.
DI2, DI3
These inputs indicate 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
This input indicates the state of Load flow switch. DI closed
– flow present; DI opened – flow absent.
DI8
This input indicates pump-down pressure switch of Circuit
1. DI closed – pressure is in the normal range; DI opened –
pressure is exceeding normal range threshold (faulty
state).
Digital Outputs
Digital output (DO) data includes these parameters:
DO1, DO2
This output turns a compressor on and off.
DO3
This output energizes and de-energizes the liquid line
solenoid valve.
DO5
This output energizes and de-energizes the Reversing
Valve Circuit 1. Energized – Heating Mode; deenergized –
Cooling Mode or Defrost (default state).
DO6, DO7
These outputs indicate Compressor 1/2 Vapour Injection
Solenoids.
DO9
This output is Liquid Line Bypass Solenoid Valve Circuit 1.
ARTC-SVX009A-EN
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