Trane Modular 20 to 35 Tons Liste des pièces télécharger pdf (Page 47)

PKG-PRC003U-EN 47

Controls

• VO relay – energized

• Exhaust fan (field-installed) - on

• Exhaust damper (field-installed) - open

Purge with duct pressure control “E”.

This sequence can be used when supply air control is required for smoke control.

• Supply fan – on

• Supply fan VFD – on (if equipped)

• Outside air dampers – open

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/unoccupied output – energized

• VO relay – energized

• Exhaust fan (field-installed) - on

• Exhaust damper (field-installed) - open

Note: Each system (cooling, exhaust, supply air, etc.) within the unit can be redefined in the field

for each of the five sequences, if required. Also the definitions of any or all of the five

sequences may be locked into the software by simple key strokes at the human interface

panel.

Generic Building Automation System Module (GBAS)

The generic building automation system module (GBAS) provides broad control capabilities for

building automation systems other thanTrane’sTracer system. A field provided potentiometer or

a 0-5 vdc signal can be applied to any of the inputs of the GBAS to provide the following inputs and

outputs.Four analog inputs that can be configured to be any of the following:

1. Occupied zone cooling

2. Unoccupied zone cooling

3. Occupied zone heating

4. Unoccupied zone heating

5. SA cooling setpoint

6. SA heating setpoint

7. Space static pressure setpoint

8. SA static pressure setpoint

Each of the five (5) relay outputs can be mapped to any/all of the available diagnostics.

Demand Limiting Binary Input

This function is operational on units with a GBAS and reduces electrical consumption at peak load

times.There are two types of demand limiting, 50% and 100%. When demand limiting is needed,

mechanical cooling and heating operation are either partially (50%), or completely disabled (100%)

to save energy.The demand limit definition is user definable at the human interface panel. Demand

limit binary input accepts a field supplied switch or contact closure. When the need for demand

limiting has been discontinued, the unit’s cooling/heating functions will again become fully

enabled.

Evaporator Coil Frost Protection FROSTAT™

The FROSTAT system uses a temperature sensor on the evaporator to determine if the coil is

getting close to a freezing condition. If so, mechanical cooling capacity is shed as necessary to

prevent icing.

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Trane Modular 20 to 35 Tons Liste des pièces Page 47

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