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23NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting
Economizer isolation valve (optional)
When multiple Modules having three-way valves are connected to a common coolant source, coolant
flow through a Module exists even when there is no cooling demand. The Economizer (coolant) isolation
valve is used in these instances to stop coolant flow through a Module during times of no cooling
demand in applications where a variable speed coolant pump is used.
• Econ Isolator Close Dly
• Econ Isolator Open Dly
• Econ Isolator Valve Enable
• Econ Isolator— mapped to an output relay
Path: Main > Setup > System # > System Config > System Delays
Econ Isolator Valve Delay: Close.
When there is no longer a demand for cooling, the Economizer
isolation valve actuator closes the valve. The valve remains open during the close delay, keeping coolant
flowing through the coil and the heat exchanger until the delay expires.
Econ Isolator Valve Delay: Open. When there is a demand for cooling, the Economizer isolation
valve actuator opens the valve. The compressors will not engage until the open delay has elapsed.
Note: If you are using different types of actuators for the Modules in your System, set the
open delay to accommodate the valve that takes the longest to open.
Path: Main > Setup > System # > System Config > Coil Fluid Options
Econ Isolator Valve: Enable.
Use this setting to indicate that an Economizer isolation valve is
installed in the coolant piping for this System.
Path: Main > Setup > System # > Input/Output > Output Relays
Econ Isolator Output Relay. To use the Economizer isolation valve, you must map the ECON
ISOLATOR event to one of the output relays. When you set up the relay for the Main Module, it will
copy the settings to the Expansion Modules.
You must set an output relay to activate the Economizer isolation valve. See “Output relays”
on page 27 for instructions on how to set up the relay.