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SCXG-SVX01B-EN 73
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 local Trane
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
general
information
Operation