Installation, Operation and Maintenance Manual
Marvel Plus
4
Subject to change without notice.
120.5-IM (1018)
ELECTRICAL HAZARD
Only a qualified licensed electrician or other individual that
is properly trained in handling live electrical components
should perform the wiring installation� Failure to follow all
electrical safety precautions and industry accepted practices
when exposed to live electrical components could result in
death or serious injury�
INFORMATION
All electrical wiring must be in accordance with NEC
(National Electrical Code), NFPA (National Fire Protection
Agency) most current versions as well as any applicable
state or local codes�
INFORMATION
Unit wiring and components have been designed for the
specific unit application and factory assigned controls.
Do not use the unit transformers or alter the unit wiring to
interface any field supplied accessories or controls.
WARNING
Moving fan drives and high horsepower blowers/motors can
cause injuries� Before applying power to the unit, make sure
all service access panels/doors are closed and fastened/
latched to prevent injuries from the moving drives or from
blowing open� Connect power to the unit at the main power
supply. Next, apply power at the field in- stalled service
disconnect switch�
The Marvel Plus controller is designed to control United
CoolAir Variable Air Volume configured units. The Marvel
Plus controller package consists of a double microprocessor
design control system made up of a Marvel Plus main control
board and a Marvel Plus wall mount terminal “display and
keypad” (standard configuration).
The Marvel Plus microprocessor main board is a 16 bit
microprocessor programmable controller with on-board
flash memory (4 Megabytes). An on-board real time clock
maintains programming during a loss of power� All critical
control points such as system set points, system schedules,
alarm set points, and alarm history are stored in non-volatile
memory� Each Marvel Plus controller has the ability to
record up to 50 alarms/faults under an alarm history page
to allow technicians to scroll through alarm history to view
critical operating data temperatures and optional discharge
refrigerant pressure (units with head pressure control option)
at the time of failure�
The Marvel Plus wall mount terminal is used to interface
with the Marvel Plus Main Board microprocessor through
the on-board display and keypad� The software stored in the
flash memory of the Marvel Plus Main Board microprocessor
was designed with menu/sub-menu driven dis- play screens
allowing customers to easily navigate through the menus
and sub-menus for setup of their systems�
Marvel Plus Main Board microprocessors allow for connection
to some of the more widely used Building Management
Systems without requiring a Gateway to interface� For
optional communications with BACnet™, Modbus, or
Lonworks®, an add-on Serial or IP based communications
card is required�
Display Mounting Location
The wall display does not provide any temperature or
humidity sensing functions� Therefore, the display can be
mounted either in the space being conditioned or in a remote
location�
Connecting Cable
The Marvel Plus is supplied with a factory provided
communications cable� A factory supplied cable MUST be
used when connecting the Marvel Plus display to the Marvel
Plus control board�
The standard cable length provided is 100 feet� Any excess
length can be placed where practical� It should be noted
that any excess cable should not be coiled up as this may
generate EMF that could affect the control operation� As
always, care must be taken not to place this control cable in
proximity to any high voltage power wiring�
The maximum length of cable in the standard configuration
will be 500 feet� Beyond 500 feet a different type of cable
and cable gauge must be used�
If a longer length of cable (i�e� more than 100 feet) is required,
please contact a United CoolAir Distributor�
