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O O p p e e r r a a t t i i n n g g P P r r o o c c e e d d u u r r e e s s
Digital Inputs
Digital input (DI) data includes these parameters:
Digital LEDs
Figure 21. Digital inputs
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 D D I I 1 1
on the primary module will turn the entire chiller/heater
on or off.
DI2, DI3, and DI4
These show the states of the evaporator, condenser, or
source flow switches. If the digital input for a switch
indicates closed, flow is present. If the digital input for
a switch indicates open, flow is absent.
DI7 and D8
These show the discharge and suction pressure
switches. If the digital input for a switch indicates
closed, the pressure is in the normal range. If the digital
input for a switch indicates open, the pressure is
exceeding normal range threshold (that is, faulty state).
DI9 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 the primary phase monitor is enabled, the common
power supply protection module is active for the
chiller/heater. Failure of the phase monitor will affect
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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:
G G r r e e e e n n L L E E D D — This digital input is energized, the
connected device is closed.
G G r r a a y y L L E E D D — This digital input is de-energized, the
connected device is open.
all modules in the chiller/heater. In this case, digital
input is optional for the secondary modules.
Digital Outputs
There is an LED for each digital output which shows its
current state.
DO1, DO2 Comp On/Off
This digital output turns a compressor on and off.
DO3 Liq Line Solenoid 'E'
This digital output energizes and de-energizes the
liquid line solenoid valve 'E'.
DO4 Liq Line Solenoid 'S'
This digital output energizes and de-energizes the
liquid line solenoid valve S.
DO6, DO7, DO8, DO9
Valve D1, D2, S1, S2. Used to command refrigerant
valves open / closed. Green LED - valve is commanded
open. Grey LED - valve is commanded closed.
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.
ARTC-SVX005B-EN
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