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control inside control panel is required either heating (for
cold environment) or cooling (for hot environment).
AI12
These inputs indicate Liquid Line Temperature Circuit 1.
Analog Outputs
Analog output (AO) data includes these parameters:
AO1
These outputs indicate the variable speed of Fan Bank 1.
AO2
These outputs indicate the variable speed of Fan Bank 2 (if
applicable).
AO3
These outputs indicate Load Isolation Valve position.
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
primary digital on-off input is enabled, toggling the DI1 on
the primary module will turn the entire heat pump 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 Load 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.
ARTC-SVX006A-EN
If common power supply protection module is used for the
heat pump, its failure will affect each module. In such a
case this DI is optional for secondary module.
DI9
This is the feedback for 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).
DI10
This is the feedback for Vapor Injection Circuit 1. Vapor
Injection Status: DI closed – Vapor Injection running; DI
opened – Vapor Injection not running.
Digital Outputs
There is an LED for each digital output which shows its
current state.
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 output is energized, the
connected device is powered up or running.
Gray LED — This digital output is de-energized, the
connected device is not powered up or not running.
DO1, DO2 Comp On/Off
This digital output turns a compressor on and off.
DO3 Liq Line Solenoid Circuit 1
This digital output energizes and de-energizes the liquid
line solenoid valve.
DO5
This digital output energizes and de-energizes the
Reversing Valve Circuit 1. Energized – Heating Mode;
deenergized – Cooling Mode or Defrost (default state).
DO6-DO8 Fans 1, 2, 3
This digital output is used to turn fans of Fan Bank 1 on and
off.
DO9
This digital output is Liquid Line Bypass Solenoid Valve
Circuit 1.
DO10 General Alarm
This digital output energizes when any of the following
alarms occur:
•
An alarm that shuts down and locks out compressor 1
or 2.
Operating Procedures
33
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