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•
OFF by Heat Sensor - The chiller/heater heating
temperature sensor has failed.
•
OFF by No Slaves - The master microprocessor
controller cannot communicate with any of the slave
modules
•
OFF by Exp IO Fault - A failure occurred in the master
microprocessor controller IO expansion module which
renders all system temperature sensors failed. All
master status states 3 through 6 will cause all modules
to run in the stand-alone mode. These failing
conditions are avoided in normal master and slave
operations.
Lead Module
By default, the master module is the lead module (the
module that is the first to be engaged). The lead module
always starts first. When there are no compressors
running, the lead module always keeps its evaporator or
condenser valves open (depending on the current mode)
to allow for chilled water or hot water circulation.
The indicator reads YES or NO to indicate if the module is
currently the lead module.
•
Master Online - This applies to slave microprocessor
controllers only.
•
LED Illuminated Green - The slave microprocessor
controller is communicating with the master
microprocessor controller
•
LED Illuminated Gray - The slave microprocessor
controller is not communicating with the master
microprocessor controller
•
Stand-alone - A chiller/heater that consists of only a
single module always operates in Stand-alone Mode
since the master microprocessor controller does not
have subordinate slave modules with which to
communicate. A module in a multiple-module chiller/
heater operates in the stand-alone mode whenever it
does not meet either master module or slave module
operating conditions. A module temporarily forced to
operate in the stand-alone mode controls cooling and
heating temperatures locally based on:
• Its evaporator and condenser EWT and LWT.
• Its cooling and heating and simultaneous mode.
• Its control temperature sensor selection.
The module runs temporarily in this mode until normal
master and slave operation is restored.
•
Slave Module - A module acts as a slave module
when
Table 6.
D1/D2 and S1/S2 values
Value
Simultaneously Mode
Discharge 1 (D1)
Discharge 2 (D2)
ARTC-SVX005A-EN
Cooling only Mode
Open
Closed
• Its microprocessor controller has been assigned the
IP address from the slave address range.
• It is communicating with master module.
• The master module exists on the network. The
master microprocessor controller meets master
module conditions.
Mode Status
There are six possible values:
•
Simultaneous - The module is in simultaneous mode.
•
Heating - The module is in heating mode.
•
Cooling - The module is in cooling mode.
•
Switching to Simult - The module is switching to
simultaneous mode.
•
Switching to Heat - The module is switching to
heating mode.
•
Switching to Cool - The module is switching to
cooling mode.
Heat Exchanger Indicators
This displays each heat exchanger (evaporator, condenser,
or source) inlet and outlet temperatures as well as the
condition of its isolation valves.
Refrigeration Indicators
The refrigerant temperatures and pressures are displayed:
suction pressure, discharge pressure, suction
temperature, and suction super heat temperature.
Solenoid 'E'
This is the solenoid valve installed at the evaporator heat
exchanger inlet. It opens when compressors are running in
simultaneous or cooling mode.
Solenoid 'S'
This is the solenoid valve installed at the source heat
exchanger inlet. It opens when compressors are running in
heating mode.
EX Valve
This indicates the position of electronic expansion valve.
D1/D2/S1/S2
These are the discharge and Suction Refrigerant Valves.
Depending on the Module Thermal Mode, valves are
automatically positioned as follows:
Heating only Mode
Closed
Open
Operating Procedures
Open
Closed
37
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