Trane SCXG-SVX01B-EN manual Human Interface Module Standard on all Units, Heat Module

general

Operation information

Compressor Module (MCM - Standard on all Units

The compressor module, (single circuit and multiple circuit) energizes the appropriate compressors and condenser fans upon receiving a request for mechanical cooling. It monitors the compressor operation through feedback information it receives from various protection devices.

Human Interface Module - Standard on all Units

The human interface (HI) module enables the operator to adjust the operating parameters for the unit using it's 16-key keypad on the human interface panel. The HI panel provides a two line, 40 character, clear language (English, Spanish, or French) LCD screen with unit status information and menus to set or modify operating parameters. It is mounted in the unit’s main control panel and accessible through the unit’s control panel door.

Remote Human Interface Module Option

The optional remote-mount human interface (RHI) panel has all the functions of the unit-mounted version except for service mode.To use a RHI, the unit must be equipped with an optional interprocessor communications bridge (IPCB). Model number digit 32 (=2) indicates if the ICPB was ordered with the unit. If not, contact your localTrane representative to order an ICPB kit for field installation. The RHI can be located up to 1,000 feet (304.8 m) from the unit. A single RHI can monitor and control up to four self-contained units if each one contains an IPCB. The IPCB switches must be set as SW1- off, SW2 - off, and SW3 - on.

Interprocessor Communications Board • Option used with RHI

The interprocessor communication board expands communications from the unit's UCM network to a remote human interface panel. DIP switch settings on the IPCB module for this application are; switches 1 and 2 “off,” switch 3 “on.”

Waterside Module - Standard on all water-cooled units

The waterside module (WSM) controls all water valves based on unit configuration. In addition, the WSM monitors waterflow proving and the following temperatures:

•entering water

•entering air low

•mixed air

•entering condenser water

•refrigerant circuit 3:

•saturated condenser

•evaporator frost

•motor winding

•refrigerant circuit 4:

•condenser

•evaporator

•motor winding

Cooling Tower Interlock

To interlock condenser pump/tower with cooling operation, wire the cooling tower to an external 115 volt control power source, to ground, and to control terminal block. Normally open/closed contacts are provided.

Heat Module

The heat module is standard on all units with factory-installed heat. It controls the unit heater to stage up and down to bring the temperature in the controlled space to within the applicable heating setpoint. Also, it includes a freezestat, morning warmup, and heating outputs.

Ventilation Override Module (VOM) Option

The ventilation override module can be field-configured with up to five differnent override sequences for ventilation override control purpose. When any one of the module’s five binary inputs are activated, it will initiate specified functions such as; space pressurization, exhaust, purge, purge with duct pressure control, and unit off.

Once the ventilation sequences are configured, they can be changed unless they are locked using the HI. Once locked, the ventilation sequences cannot be unlocked.

The compressors and condenser fans disable during the ventilation operation. If more than one ventilation sequence

activates, the one with the highest priority (VOM “A”) begins first, with VOM “E” having lowest priority and beginning last.

A description of the VOM binary inputs follows below.

UNIT OFF sequence “A”

When complete system shut down is required, the following sequence can be used.

•Supply fan – off

•Supply fan VFD – off (0 Hz)

•Inlet guide vanes – closed

•Outside air dampers – closed

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

•Occupied/Unoccupied output – de- energized

•VO relay – energized

•Exhaust fan (field-installed) - off

•Exhaust damper (field-installed) - closed

PRESSURIZE sequence “B”

This override sequence can be used if a positively pressured space is desired instead of a negatively pressurized space.

•Supply fan – on

•Supply fan VFD – on (60 Hz)

•Inlet guide vanes/VAV boxes – open

•Outside air dampers – open

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

•Occupied/ unoccupied output - energized

•VO relay - energized

•Exhaust fan (field-installed) - off

•Exhaust damper (field-installed) - closed

EXHAUST sequence “C”

With the building’s exhaust fans running and the unit’s supply fan off, the conditioned space becomes negatively pressurized. This is desirable for clearing the area of smoke when necessary; i.e. from an extinguished fire, to keep smoke out of areas that were not damaged.

•Supply fan – off

•Supply fan VFD – off (0 Hz)

•Inlet guide vanes – closed

•Outside air dampers – closed

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

•Occupied/Unoccupied output – de- energized

•VO relay – energized

•Exhaust fan (field-installed) - on

•Exhaust damper (field-installed) - open

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