Specifications

Smoke Detector Status (SDS)

The unit may be setup to receive a smoke event via a contact closure. The smoke detector input

is wired to the expansion module. Consult the wiring diagram for specific wiring port location.

The response to a smoke event must be determined by safety regulations and jurisdiction of the

local governing body. The smoke detector response must be enabled and setup by the system

integrator and safety personnel. The default behavior for a smoke event will terminate the

operation of the unit (fan and compressor). The unit may be configured for operation during a

smoke event for specific safety applications, and the safety integrator must determine the

appropriate behavior during a smoke event. Variable Frequency Drive configured units may can

be configured for a specific air flow during a smoke event. A Smoke Detector contact closure will

produce a Smoke Alert.

Supply Fan Status (FSS)

The supply fan status input contact closure is used to establish fan operation for the unit upon a

proven fan call. Both inputs must be established prior to compressor operation being allowed.

The supply fan status input is wired to the expansion module. Consult the wiring diagram for the

specific port location. The equipment integrator must select the proper expansion module option

and enable fan alarms for the unit configuration. If the supply fan is not proven upon a fan call

then an alarm is asserted.

Valve Status (VES)

The Valve End switch option is used to hold of compressor operation until the condenser water

valve opens completely. Upon a compressor operation call, the valve is signaled to open via

output BO-5. The condenser water valve does not open instantly therefore a delay will be

imposed until water flow through the condenser coil can be in place prior to compressor start.

The valve status input is wired to the input expansion module. Consult the wiring diagram for the

specific port location. The end switch of the valve is used to signal condenser water valve control

that the condenser water is “flowing” and the unit is safe to operate.

The following applies to the Valve End Switch status:

• Valve status requires an input for the valve end switch (input expansion module) and

output.