United CoolAir MARVEL MINI Installation, Operation And Maintenance Manual
MARVEL MINI HVAC
MICROPROCESSOR CONTROLLER
Installation, Operation and Maintenance Manual
Effective December 2018
Building Management System
***Interactive PDF***
CONTENTS
Installation, Operation and Maintenance Manual
Marvel Mini
GENERAL PURPOSE . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Marvel Mini™ - Controllable System Component
Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
AVAILABLE FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . 5
HARDWARE AND ARCHITECTURAL LAYOUT. . . . . . . 6
MARVEL MAIN BOARD. . . . . . . . . . . . . . . . . . . . . . . . 7
MARVEL TERMINAL (WALL CONTROL) . . . . . . . . . . 8
MARVEL WALL DISPLAY BUTTONS . . . . . . . . . . . . . 9
PROGRAMMING AND OPERATING SCREENS . . . 10
DISPLAY DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . .11
CONNECTING CABLE . . . . . . . . . . . . . . . . . . . . . . . 13
SENSOR INSTALLATION AND ELECTRICAL
TERMINATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Static Pressure Transducer
(Duct Mount) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
MARVEL MULTIAPP CONTROLLER – SEQUENCE OF
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
STANDARD SYSTEM SAFETIES . . . . . . . . . . . . . . . 29
OPTIONAL SYSTEM SAFETIES. . . . . . . . . . . . . . . . 31
Marvel Terminal Keypad and Display Operation . . . . 32
Controller Operation. . . . . . . . . . . . . . . . . . . . . . . . . . 32
Changing Set Points, Parameters, And Values . . . . . 33
SYSTEM ENABLES. . . . . . . . . . . . . . . . . . . . . . . . . . 39
SET POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
ALARM SET POINTS . . . . . . . . . . . . . . . . . . . . . . . . 44
Run Hours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Clock Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Set-Back. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
CHANGE PASSWORD . . . . . . . . . . . . . . . . . . . . . . . 51
Technician Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
FAN DELAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SYSTEM UNITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
NETWORK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
SENSOR SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
MANUAL CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . 56
DIGITAL INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
ECONOMIZER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
BLOWER VFDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
CHANGE PASSWORDS . . . . . . . . . . . . . . . . . . . . . . 58
SYSTEM INFORMATION . . . . . . . . . . . . . . . . . . . . . 58
INPUT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
OPTIONAL BOARDS. . . . . . . . . . . . . . . . . . . . . . . . . 60
SYSTEM NETWORKING. . . . . . . . . . . . . . . . . . . . . . 61
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Installation, Operation and Maintenance Manual
GENERAL PURPOSE
Marvel Mini
The Marvel Mini™ is a microprocessor based electronic
programmable controller with a multi-tasking operating
system used to control United CoolAir manufactured
HVAC systems using a newly developed Multi-Application
software package. With this new system all of the previous
applications provided by United CoolAir are all now bundled
into one software package. So this one Multi-Application
software package can now handle standard heating, cooling,
dehumidication, humidication, as well as the heat pump,
Variable Air Volume, and Outdoor Air applications. The only
difference will be the size of the hardware controller installed
in each unit. Since this is a mini controller package, options
are limited so please inquire with sales and marketing when
there are questions. The basis of design for the Marvel
Mini Controller is for a maximum of one compressor and/or
one heater with two modulating analog outputs to regulate
optional devices based on demand. All available device
options are listed starting on page 4.
Each Marvel Mini™ controller comprises of two ash drives
“volume 0”, having 32MB in which the main application
program resides and cannot be accessed by the user and
an additional drive “volume 1”, having 96MB of NAND ash
memory available to the user and accessed through the
USB port or FTP Protocol. Volume 1 is useful to the end
user as there is free space to add unit-operating literature,
web pages, and system logs. The microprocessor is based
on 32 bit, 100 MHz so now variables can be communicated
in 32bit data-type format.
Since the Marvel controller has a multi-tasking operating
system, it now supports networking of additional
programmable controllers, remote user terminals,
communicating devices as well as interfacing with Building
Management Systems much easier than its predecessors
that had BIOS rmware.
Figure 1 – System Layout is made up of the Marvel Mini™
main control board showing options for communicating
devices, networking, building management and supervisory
system setups. Customers have the option of either a builtin or wall mount display and keypad or even both of these if
desired. The Marvel Mini™ system also contains common
required standard sensors as well as optional sensors that
must be eld installed and wired to the factory provided eld
interface terminal blocks in the air handlers electrical control
box.
Each Marvel Mini™ has numerous standard setups built
for interfacing with ECM Fans and VFDs for low ambient
and duct pressure control and/or Humidier controllers
through serial communication ports saving additional I/O for
system sensors. The Universal Input channels have been
developed so that a customer can replace or add a sensor
in the eld and set up the characteristics of the sensor
under a sensor setup menu however, it is recommended
to contact the local distributor or factory before doing so for
detailed information.
The Marvel Mini™ is equipped with a set of plug in terminal
block connectors used to connect the Main Board to the
controlled devices (i.e. solenoid valves, compressor
contactor(s), blower contactors, heater contactors, VFDs,
etc.). The application program is stored in Flash Memory
of the controller and the unit’s hardware setup and control
set points and parameters are stored in permanent memory
(even in case of power failure). The software program is
designed for “smart control”, to automatically predict and
project required changes based upon present readings over
time intervals in efforts to proactively adjust to changing
conditions. The Marvel Mini™ can be linked with Building
Management Systems RS485 serial or Ethernet connections
with customer provided communication protocol details.
As a standard unless otherwise specied, the Marvel Mini™
microprocessor-based Remote User Terminal unit comes
complete with LCD Display and Keypad for viewing and
setting of the control parameters (set points, proportional
bands, dead bands, and alarm set points, system run hours.
etc.). The Terminal also allows viewing of the operating
parameters, staging of system components, and system
demands. Connection between the Marvel Mini™ main
board and remote user terminal is only required for viewing
or changing of the operating conditions and set points.
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Installation, Operation and Maintenance Manual
Marvel Mini
Marvel Mini™ - Controllable System Component Information
With this new format, one of the key benets of the Marvel Mini™ application software is set up universally so that any of the
following functions could literally be added to any of the corresponding channels. This means for example, any of the listed
functions under Analog/Universal Inputs could be placed onto any of the Universal Channels U1 though U10 whereas in
the past and with most control vendors, a software modication would be required. In addition now all of the Analog Inputs,
Digital Inputs, Analog Outputs, and Digital Outputs are all selectable for any of their corresponding channels. So for instance
the digital output for Compressor 1 could be congured on any of the Digital Outputs NO1 through NO18 (example of large
controller maximum number of Digital Outputs). These Universal Functions for each of the four I/O Groups are:
ANALOG/UNIVERSAL INPUTS
Return Temperature Compressor 1 Liquid Temperature Compressor Liquid Pressure
Space Temperature Compressor 1 Suction Temperature Space Humidity
Outdoor Air Temperature Water Temperature Outdoor Air Humidity
Supply Air Temperature 1 Return Humidity
ANALOG OUTPUTS
Modulating Hot Gas Bypass Modulating Waterside Economizer Discharge Pressure Valve 1
Airside Economizer Modulating Reheat
Modulating Heater Modulating Humidifier
DIGITAL INPUTS
Compressor 1 High Pressure Remote ON/OFF Heater High Limit
Compressor 1 Low Pressure Dirty Filter Water Flow
Loss of Airflow Compressor Freeze Stat Smoke Purge
Drain Pan Overflow Fire/Smoke Alarm Heat Pump Defrost Switch
DIGITAL OUTPUTS
Supply Blower Heater Global Alarm Output
Outdoor/Fresh Air Damper Reversing Valve
Compressor Reheat
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Installation, Operation and Maintenance Manual
Marvel Mini
AVAILABLE FUNCTIONS
The following is a listing of available functions please inquire with the local United CoolAir Distribution for unit design
congurations with these functions:
● One Compressor Staged ON/OFF or Digital.
● One Heater Staged ON/OFF or Modulating or Hot Water Coil or Steam Coil for modulating control
valves at 0-10vdc output.
● Modulating Humidier controlled via Modbus Communications.
● Modulating Hot Gas Bypass for system capacity control.
● Modulating Blower control for Variable Air Volume applications with VFDs communication via
Modbus to display critical information from the VFD to the Display where as previously important
information such as motor current, motor speed, voltage, kw hours was not supplied due to hard wire
congurations.
● Modulating Blower for Variable Air Volume applications via ECM motors.
● Hot Gas Reheat either by Stage or Modulating.
● Compressor safeties for high and low pressure are wired independently for true notication of which
failure High or Low Pressure.
● An Air Switch has been incorporated to turn off cooling, heating, dehumidication, and humidication in
the event of a loss of air ow due to a broken v-belt or other means.
● On a heater high limit failure the heaters are locked out, but automatically reset when the safety resets.
The display and alarm button will indicate an alarm occurred with the heating function.
● Airside or Waterside Economizer.
● Integrated Economizer function that allows Mechanical Cooling Compressors to assist is also available.
● Networking of multiple units with Unit Lead Lag and Backup unit assist is built into the main software
platform so if multiple units are shipped to the eld and the customer decides to network the units
together at a later date the software is already capable of networking up to 16 total units.
● Building Management Systems via the following BMS Protocols is available: BACnetTM Modbus®,
Lonworks®, HTML Web Pages
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HARDWARE AND ARCHITECTURAL LAYOUT
HARDWAREANDARCHITECTURALLAYOUT
Terminal /
Wall Mount
Control
Interface Wiring
Interface
RS485
Installation, Operation and Maintenance Manual
Marvel Mini
Building
Management
System
BMS - Interface
Networking Cable
RS485
Interface
Marvel Premium
Mini Main Board 1
FIGURE 1 – HARDWARE / ARCHITECTURE LAYOUT
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Marvel Premium
Mini Main Board 2
Installation, Operation and Maintenance Manual
Marvel Mini
MARVEL MAIN BOARD
Figure 2 – Marvel Mini™ Main Board is the layout of the main control board. The reference designator Jxx specically lists
the functions of each location on the board. These references are as follows:
FIGURE 2 – MARVEL MAIN BOARD
J1 Control Voltage connection terminals. 24 VAC required.
J2 Universal Inputs used for sensor readings. Each channel can handle any of the Analog/Universal Input
functions.
J3 Used for connecting the Remote Display/Wall Terminal
J4 Fieldbus Device Connections.
J6 BMS Interface RS-485 or Ethernet based on model ordered.
J7 No Function for the Marvel Mini™ controller.
J8 Digital Inputs used for safety and alarm devices and Analog Outputs used for optional modulating devices.
J9 Power supply +5 vdc or +24 vdc to power sensor devices.
J10 Normally Open Digital Outputs 1 and 2.
J11 Normally Open Digital Outputs 3 through 5.
J12 Normally Open/Normally Closed Digital Output 6.
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Installation, Operation and Maintenance Manual
Marvel Mini
MARVEL TERMINAL (WALL CONTROL)
The Marvel Terminal is complete with LCD Display and Keypad. The Terminal has LED indicators integral to the buttons. A
description of each indicator light is discussed with the function of the each button starting on page 11.
The Marvel Terminal contains no sensors and does not need to be located in the building’s space that is being conditioned.
The Terminal can be mounted up to 1000 feet from the equipment. See Figure 3 – Terminal below for reference. The
Terminal is made up of the following components:
A. External buttons Prg, Esc, , , and or (adjustment buttons) with integral LED indicators.
B. Submenus include System ON/OFF, System Status, System Enables, Set Points, Alarm Set Points, Run
Hours, Day Min/Max, Clock Settings, Schedule, Setback, Unocc Control, Change Passwords, Technician
Menu, Factory Menu
C. A 22 character by 8 row LCD Display with English text for ease of understandability for adjustment.
FIGURE – 3 TERMINAL (WALL MOUNT) CONTROL
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MARVEL WALL DISPLAY BUTTONS
See Figure 4 – Control Buttons for reference.
Installation, Operation and Maintenance Manual
Marvel Mini
ALARM BUTTON
PROGRAM BUTTON ENTER BUTTON
ESCAPE BUTTON DOWN BUTTON
UP BUTTON
FIGURE 4 – CONTROL BUTTONS
ALARM BUTTON
The button is used for viewing the present alarms with the system. During an alarm condition, the button is illuminated
a continuous Red. Depending on the type of alarm, the system may shut down or continue to operate. Some types of alarms
are just simple faults known as indicators which are not harmful to the operation of the unit but may require attention in the
near future. Pressing the button will reveal what alarm caused the system to shut down. To reset an alarm, press the
button until the screen displays “NO MORE ALARMS; To reset the alarm, simply press the button again to reset the alarm.
PROGRAM BUTTON
The Prg button is used to enter into menus and sub menus. On controllers with built in displays, the is the program button.
ESCAPE BUTTON
The Esc button is used to return to the main system status from a menu or sub-menu or escape to the previous menu from
a sub-menu. On controllers with built in displays, the is the escape button.
UP BUTTON
The up button is used to scroll upward through status screens, menus, sub-menus and change the value of parameters or
settings.
ENTER BUTTON
Upon application of power to the system, the splash screens appear then the main status home screen will appear. Use the
enter button to move the cursor to the next eld (set points or parameters) where the change is desired. Also use the Enter
button to initialize/save changed parameters and set points into memory.
DOWN BUTTON
The down button is used to scroll downward through status screens, menus, sub-menus and change the value of parameters
or settings.
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Marvel Mini
PROGRAMMING AND OPERATING SCREENS
As shown in Figure 4 previous, each of the buttons are used to access specic locations to Read or Change (such as set
point) values. Below is a list of the menus that are accessible from the wall mount controller. By pressing the Prg button
multiple times, the following menus will appear:
4. SET POINTS menu – Used for changing temperature and humidity settings. It is also used to set temperature
high and low alarm set points as well as humidity high and low alarm set points. If customers have the pressure
control option, settings will also appear to adjust duct or room pressure.
5. TIME CLOCK SETTINGS menu – Used for changing the Time Clock Readings to the current Time and Date.
This menu is also used for setup of Daylight Savings Time based on region and enabling of the Night Set Back
Function. Once the Night Set Back Function is enabled, the type of control (Temp/Humidity Setback) is enabled
and Set Points for Temperature and Humidity Setback Control shall appear as well as the day of the week to
enable Night Set Back and time of day for occupied and unoccupied period.
6. SYSTEM ENABLES menu – This sub-menu allows for re-enabling of system functions (System ON/OFF,
Humidication/Dehumidication, Compressors, Heaters, ON/OFF and Modulating Reheat, etc.) after an alarm
condition has occurred.
7. EQUIPMENT RUN HOURS menu – Displays the operational run hours of system components such as Fan,
Humidier, Compressors, Heaters, etc.).
8. ANALOG/DIGITAL INPUTS/OUTPUTS menu – This sub-menu is used to calibrate sensors and alarm input setup
settings.
9. PRG & ESC (Factory Setup menu) – Used for changing the Factory Default System settings. It is used to
change control functions with their equipment.
LCD Display
The Terminal provides eight lines of twenty-two characters per line LCD Display. The character is 5 mm in height. See Figure
5 – LCD Display.
U01 Mon 07:21 03/19/17
Return Hum > 55.0%
Return Temp> 74.7 °F
Supply Temp> 57.2 °F
One Compressor ON
FIGURE 5 – LCD DISPLAY
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Installation, Operation and Maintenance Manual
DISPLAY DIMENSIONS
Refer to Figure 6 – Terminal Dimensions for dimensional data. Dimensions shown are in inches.
Marvel Mini
FIGURE 6 – TERMINAL DIMENSIONS
Marvel Display (Terminal) – Wall Mounting
Refer to Figure 7 – Wall Mounting for instructions to mount the Terminal to a wall.
FIGURE 7 – WALL MOUNTING
Components of the Wall Controller:
A. Faceplate
B. Wall Controller
C. Mounting Plate
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Installation, Operation and Maintenance Manual
Marvel Mini
For best results in mounting of the wall controller, obtain an single position Receptacle/Switch Electrical Box which typically
measures approximately 3.75” high x 2.25” wide x 2.83” deep. Install the box sideways (90 degrees) internal to the wall
from the original upright position. The box may be installed on metal or wood studded framing. Route the eld provided
connecting cable to the box.
1. Remove the Faceplate “A” from the Wall Controller.
2. Using a small straight screw driver, remove the two screws which secure the Wall Controller “B” to the Mounting
Plate “C”.
3. Route the connector/cable through the back of the Mounting Plate “C” then screw the mounting plate to the
electrical box.
4. Plug the eld provided Connecting Cable to the Wall Controller “B” then reinstall the Wall Controller “B” back onto
the Mounting Plate “C”.
5. Connect the eld supplied standard phone cable into the coupler at the Main Board end.
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Marvel Mini
CONNECTING CABLE
The Marvel Terminal (Wall Control) connects to the Marvel
Main Board using a factory provided 100-foot phone cable.
Install the factory supplied 6-conductor cable from the
Marvel Main Board located inside the control box to the
location the Marvel Terminal shall be installed.
CAUTION: The factory provided is a special cable. If
longer or shorter cable is desired, please contact the local
Distributor for a longer/shorter length making sure to provide
the desired length. NEVER ATTEMPT TO LENGTHEN THE
FACTORY SUPPLIED CABLE as this cable specic pin
connections. The Marvel Terminal will not work if the pin
terminations are not correct and may damage the Marvel
Main Board or blow the fuse due to improper connections.
SENSOR INSTALLATION AND
ELECTRICAL TERMINATIONS
ELECTRICAL CONNECTIONS
All electrical wiring must be in accordance with NEC
(National Electrical Code)/NFPA (National Fire Protection
Agency), as well as state and, local building codes. Refer to
the specications section or the unit’s data tag for the unit’s
power requirements.
SERVICE DISCONNECT
A eld installed fused single point power service disconnect
is required. Install the service disconnect in accordance
with NEC, State, and Local building codes. NEC guidelines
require the unit’s disconnect be installed within sight of the
unit.
A factory provided power block is installed internal to the
unit’s electrical control panel. Route the main power wires
in accordance with electrical codes to the eld provided unit
service disconnect and terminate them on the line side of
the disconnect. Route the power wires from the Load side
of the eld provided service disconnect to unit power block
inside the electrical control panel.
A ground termination point is located within the unit’s
electrical control panel. All units must have a hard wired
ground from a source Earth Ground.
IMPORTANT: Metal Conduit is not an acceptable source
of ground as there may be air gaps between
connection points.
SENSOR FIELD MOUNTING & WIRING
All sensors and optional components that must be eld
installed and wired to the electrical control panel must be
wired as shown on the electrical diagram provided with
the unit. The installation instructions correspond with the
electrical diagram for the eld installable components.
For special order options which are not listed within these
sensor installation instructions, please refer to unit’s factory
provided electrical diagram and the installation instructions
provided with each component for proper installation
requirements.
Static Pressure Transducer
(Duct Mount)
Mounting
The static pressure transducer shown in Figure 8 – Pressure
Transducer must be installed in the main supply air ducting
at a location approximately two-thirds of the distance down
the straightest duct run from the supply air outlet of the unit.
The location must be a non-turbulent area of supply air ow.
Mount the pressure transducer as follows:
1. Remove the pressure transducer’s cover plate screws
using a Phillips head screw driver.
2. Select the mounting location. Install the sensor at the
approximate mid-point/center of the vertical plane of
the ducting.
3. The sensor must be mounted vertically with the
electrical entrance/strain relief facing downward.
4. Drill a ½” hole through the face of the duct.
5. Before installing the duct pressure transducer, make
sure the gasket at the base where the duct probe
meets the transducer housing is intact and sealed to
the sensor (so that it will seal the perimeter of the hole
drilled).
6. Insert the probe into the duct and mount the pressure
transducer using two (2) eld provided #8 sheet metal
screws.
Wiring
Using a minimum 18-20 AWG 300 volt rated two conductor
shielded cable with drain wire make the following electrical
connections.
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Marvel Mini
IMPORTANT: Please observe polarity of this sensor. The “+”
is +24 vdc and the “–“ is the output (4-20 mA)
to the Analog Input of the controller.
7. Connect from the positive terminal “+” inside the
pressure transducer to the unit’s electrical terminal
block TB-DMPT +.
FIGURE 8 – PRESSURE TRANSDUCER
8. Connect from the negative terminal “–” inside the
pressure transducer to the unit’s electrical terminal
block TB-DMPT –.
9. Connect the drain wire to ground at the unit end only.
The factory provided static pressure transducer is preset
for application requirements. The unit’s controller will read
the preset conguration. If a higher or lower pressure
conguration is required, use the manufacturer’s provided
literature to re-congure the sensor to read the desired
lower or higher pressure setting.
NOTE: When changing the conguration of the pressure
transducer, the range for the sensor must also be changed
within the unit’s controller/sensor setup area. Refer to the
Marvel Controller’s Technician’s Menu – Sensor Setup area
for setting up the range of the sensor.
Duct Mount Supply Air Temperature Sensor
The duct mount supply air temperature sensor(s) shown
in Figure 9 – Supply Air Sensor must be eld installed in
the supply air ducting. The location of the sensor must be
relatively close to the duct pressure transducer and must
not impede with airow to the inlet of the transducer. A few
feet (2/3 feet) from the transducer is recommended.
Mounting
1. Cut out the mounting template provided with the
sensor.
2. Select the location to mount the sensor and drill a hole
through the supply air duct at least ¾” in diameter.
3. Using a 7/64” drill-bit, drill the three fastening screw
holes located on the template for the fastening ring.
4. Remove the duct sensor’s mounting ring from the duct
probe being careful not to lose the sealing gasket.
5. Position the mounting ring over the ¾” hole drilled in
step 2.
6. Use three (3) eld provided #6 x ¾” Pan Head sheet
metal screws and fasten bracket to the duct.
7. Place the probe through the mounting bracket and into
the supply air duct.
8. Using the screw provided with the sensor installation
kit, place the screw into the clamping ring and tighten
the ring to secure the sensor to the clamping ring.
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FIGURE 9 – SUPPLY AIR SENSOR
Marvel Mini
Wiring
Figure 10 – Supply Air Sensor Wiring shows how the sensor
is wired. Using a minimum 18-20 AWG 300 volt rated two
conductor shielded cable with drain wire make the following
electrical connections. The supply air temperature sensor is
non-polarity observant.
1. Connect from one NTC terminal inside the supply air
temperature sensor to terminal block TB-SATS – NTC
inside the unit’s electrical control box.
2. Connect the other NTC terminal inside the supply air
temperature sensor to terminal block TB-SATS – NTC
inside the unit’s electrical control box.
3. Connect the drain wire to ground inside the unit’s
electrical control box.
FIGURE 10 – SUPPLY AIR SENSOR WIRING
Duct Mount Return Air Temperature Sensor (Optional
Humidity)
The return air temperature sensor shown in Figure 11 –
Return Air Sensor must be eld installed in the return air
ducting close to the unit. The return air sensor must be
located relatively close to the Filter Rack of the unit.
IMPORTANT: If the unit has optional humidity control,
please observe when making electrical connections.
Mounting
1. Cut out the mounting template provided with the
sensor.
2. Select the location to mount the sensor and drill a hole
through the supply air duct at least ¾” in diameter.
3. Using a 7/64” drill bit; drill the three fastening screw
holes located on the template for the fastening ring.
4. Remove the duct sensor’s mounting ring from the duct
probe being careful not to lose the sealing gasket.
5. Position the mounting ring over the ¾” hole drilled in
step 2.
6. Use three (3) eld provided #6 x ¾” Pan Head sheet
metal screws and fasten bracket to the duct.
7. Place the probe through the mounting bracket and into
the supply air duct.
8. Using the screw provided with the sensor installation
kit, tighten the clamping ring.
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NOTES: 1. Return Temp & RH Sensor is Factory Provided &
Field Installed.
FIGURE 11 – RETURN AIR SENSOR
Wiring
Figure 12 – Return Air Temperature/Humidity Sensor Wiring
shows how the sensor is wired. Using a minimum 18-20
AWG 300 volt rated two conductor shielded cable with drain
wire make the following electrical connections.
NOTE: Use a minimum two conductor cable for temperature
only. Use a minimum ve conductor for temperature
and humidity control.
1. The return air temperature sensor is non-polarity
observant.
2. Connect from one NTC terminal inside the return air
temperature sensor to TB – RATS - NTC.
3. Connect the other NTC terminal inside the temperature
sensor to TB – RATS - NTC.
4. Connect the drain wire to ground at the unit’s electrical
control panel end only.
Installation, Operation and Maintenance Manual
Marvel Mini
FIGURE 11.5 – CONNECTING THE TERMINAL
Optional Humidity Control
If the sensor for Return Air has the optional humidity sensor,
continue with steps 7, 8, and 9.
7. Connect from the terminal marked G+ inside the
sensor to terminal TB-RATHS – G+ inside the unit’s
electrical box.
8. Connect from the terminal marked M inside the sensor
to terminal TB-RATHS – M inside the unit’s electrical
control box.
9. Connect from the terminal marked Hout inside the
sensor to terminal TB-RATHS – Hout inside the unit’s
electrical control box.
c.pCOmini
Use the accessory cable P/N S90CONN0S0, connected
as shown in the gure. The maximum distance allowed
between controller and terminal is 10 m.
Subject to change without notice. 120.9-IM (1218)
FIGURE 12 – REUTRN AIR TEMPERATURE/HUMIDITY
SENSOR WIRING
(Example shown with TB-RATHS humidity connections
option)
16
Installation, Operation and Maintenance Manual
Marvel Mini
Room/Space Wall Mount Temperature and
Optional Humidity Sensor
The room temperature with humidity sensor option must be
eld installed in the room being conditioned. Never install
the sensor at a location that can be inuence by solar gain
such as sunlight or by drafts such as doors opening/closing
or direct movement of conditioned air such as from supply
air outlet grills. The location of this sensor should be reading
mixed air, which means the best location should be close to
a return air grille. The installation height should be between
40” to 60” above the room’s oor.
BE AWARE: If the unit has optional humidity control, polarity
must be observed when making electrical
connections.
NOTE: Use a minimum two-conductor cable for temperature
only. Use a minimum ve conductor for temperature
and humidity control. It may be required to preinstall
this wire (addition of drywall, paneling, ceilings, etc.)
if the interior room shall be completed before this
sensor will be installed. If the interior is complete,
install the cable as required being careful not to
damage the cable during installation.
Mounting
1. Cut out the mounting template provided with the
sensor.
2. Select the location to mount the sensor and drill the
appropriate size holes (for the factory supplied wall
anchors) into the surface the sensor is being installed
on.
3. Install the wall anchors as required for installation of
the sensor.
4. Drill a through hole approximately 3/8” to 1/2” in
diameter for the cable as required.
5. Place the cable through the back of the sensor.
6. Using the screws provided, screw the sensor to the
wall.
Wiring
Figure 13 – Room Temperature Humidity Sensor Wiring
shows the electrical connections for the sensor. Using
a minimum 18-20 AWG 300 volt rated two conductor
shielded cable with drain wire make, the following electrical
connections.
NOTE: Use a minimum two-conductor cable for temperature
only. Use a minimum ve conductor for temperature
and humidity control.
1. The room air temperature sensor is non-polarity
observant.
Room/Space Wall Mount Temperature
Sensor Only
2. Connect from one NTC terminal inside the room
air temperature sensor to TB-RTS – NTC (room
temperature only)
3. Connect the other NTC terminal inside the room
air temperature sensor to TB-RTS – NTC (room
temperature only).
Or
Room/Space Wall Mount Temperature /
Humidity Sensor
4. Connect from one NTC terminal inside the room
temperature/humidity sensor to TB-RTHS – NTC
(room temperature and humidity sensor)
5. Connect the other NTC terminal inside the room
temperature/humidity sensor to TB-RTHS – NTC
(room temperature and humidity sensor).
6. Connect the drain wire to ground at the unit’s electrical
control panel end only.
Optional Humidity Control
If the Room Temperature and Humidity Sensor for Room
Air has the optional humidity sensor, continue with steps 7,
8, and 9.
7. Connect from the terminal marked G+ inside the
sensor to terminal TB-RTHS – G+ inside the unit’s
electrical box.
8. Connect from the terminal marked M inside the sensor
to terminal TB-RTHS – M inside the unit’s electrical
control box.
9. Connect from the terminal marked Hout inside the
sensor to terminal TB-RTHS – Hout inside the unit’s
electrical control box.
Subject to change without notice. 120.9-IM (1218)
17
Installation, Operation and Maintenance Manual
FIGURE 13 – ROOM TEMPERATURE HUMIDITY SENSOR WIRING
Marvel Mini
(Example shown with TB-RTHS humidity connections
option)
Duct Mount Outdoor Air Temperature
Sensor
The duct mount outdoor air temperature sensor shown in
Figure 14 – Outdoor Air Temperature / Humidity Sensor
must be eld installed in the outdoor air ducting close to an
outdoor air louver but back inside of the ducting far enough
that it does not rain onto the sensor. It should also be located
before the outdoor air inlet damper in order to always
monitor the outdoor air temperature and humidity correctly
unless the unit will always be providing a minimal amount of
outdoor air when occupied (in this case the sensor could be
located between the outdoor air louver and the unit).
IMPORTANT: If the unit has humidity control for airside
economizer, polarity must be observed when making
electrical connections.
1. Cut out the mounting template provided with the
sensor.
2. Select the location to mount the sensor and drill a hole
through the supply air duct at least ¾” in diameter.
3. Using a 7/64” drill bit; drill the three fastening screw
holes located on the template for the fastening ring.
4. Remove the duct sensor’s mounting ring from the duct
probe being careful not to lose the sealing gasket.
5. Position the mounting ring over the ¾” hole drilled in
step 2.
6. Use three #6 x ¾” Pan Head sheet metal screws and
fasten bracket to the duct.
7. Place the probe through the mounting bracket and into
the supply air duct.
8. Using the screw provided with the sensor installation
kit, tighten the clamping ring.
Subject to change without notice. 120.9-IM (1218)
18
Installation, Operation and Maintenance Manual
Marvel Mini
FIGURE 14 – OUTDOOR AIR TEMPERATURE / HUMIDITY SENSOR
Wiring
Using a minimum 18-20 AWG 300 volt rated two conductor
shielded cable with drain wire make the following electrical
connections. Use a minimum ve conductor for temperature
and humidity control. Refer to Figure 15 – Outdoor
Temperature/Humidity Sensor Wiring.
1. The return air temperature sensor is non-polarity
observant.
2. Connect from one NTC terminal inside the outdoor
temperature/humidity sensor to TB-OTHS – NTC.
3. Connect the other NTC terminal inside the outdoor
temperature/humidity sensor to TB-OTHS – NTC.
4. Connect the drain wire to ground at the unit’s electrical
control panel end only.
5. Connect from the terminal marked G+ inside the
outdoor temperature/humidity sensor to terminal TBOTHS – G+ inside the unit’s electrical box.
6. Connect from the terminal marked M inside the
outdoor temperature/humidity sensor to terminal TBOTHS – M inside the unit’s electrical control box.
7. Connect from the terminal marked Hout inside the
outdoor temperature/humidity sensor to terminal TBOTHS – Hout inside the unit’s electrical control box.
FIGURE 15 – OUTDOOR TEMPERATURE/HUMIDITY
SENSOR WIRING
Subject to change without notice. 120.9-IM (1218)
19
Installation, Operation and Maintenance Manual
Marvel Mini
Remote Alarm Output Option
On systems without BMS Communications, an option can
be provided for Remote/Global Alarm Output, which closes
a set of voltage free dry contacts on global alarm to terminals
TB-RA – 1 and TB-RA – 2. With this option, look for terminal
block TB-RA. The device must not exceed 10 amps at 240
VAC or 10 Amps at 24 VDC. Install two conductors 14 – 18
AWG 600 volt rated from the Remote Alarm device to the
unit’s terminal blocks TB-RA. Whether connecting a buzzer
or an indicator light, the device must have a separate power
source. Determine which side of the device to disconnect
(hot or common/neutral) through the factory provided dry
contact terminal blocks and wire as follows:
Wiring the Remote/Global Alarm Output
1. Remove one wire from the Coil of the Alarm Device
and wire nut or splice cap this wire with one of the two
wires going to the Remote Alarm interlock wiring.
2. Connect the other wire of the Remote Alarm interlock
wiring to the location of the wire removed from Remote
Alarm device.
3. At the unit, connect one wire to terminal TB-RA – 1.
4. Connect the other wire to TB-RA – 2.
3. At the unit, connect one of the wires to TB-WP – 1.
4. Connect the other wire to TB-WP – 2.
Optional Airside Economizer Damper
Control
If the customer’s system has optional Airside Economizer
Dampers that must be modulated for free cooling, the
terminal blocks for interlocking this function are TB-ASE –
1, TB-ASE – 2, and TB-ASE – 3. Install three conductors
16 – 18 AWG minimum 300 volt rated from the Airside
Economizer Damper Actuators’ location to the unit’s terminal
blocks TB-OAD.
Connect the wires as follows:
Wiring of the Airside Economizer Damper
Actuators
1. Connect the Common wire at the Damper Actuator to
terminal TB-ASE – 1 inside the unit’s electrical box.
2. Connect the 24 vac wire at the Damper Actuator to
terminal TB-ASE – 2 inside the unit’s electrical box.
3. Connect the 0-10 vdc wire at the Damper Actuator to
terminal TB-ASE – 3 inside the unit’s electrical box.
Remote Water Pump ON/OFF Option
If the customer’s system has an ON/OFF Water Pump that
must be commanded on when there is a call for cooling,
and the unit has the optional Remote Water Pump ON/
OFF terminal blocks, the terminal blocks for interlocking
this function are TB-RWP – 1 and TB-RWP – 2. Determine
whether the Hot or Common/Neutral shall be wire through
the contacts for Remote Water Pump interlock. Next,
install two conductors 14 – 18 AWG 600 volt rated from
the Remote Water Pump’s Contactor/Starter location to
the unit’s terminal blocks TB-RWP. Connect the wires as
follows:
Wiring at the Pumps Contactor/Starter
1. Remove one wire from the Coil of the Water Pump’s
Contactor/Starter and wire nut or splice cap this wire
with one of the two wires going to the Remote Water
Pump interlock wiring.
2. Connect the other wire of the Remote Water Pump
interlock wiring to the location of the wire removed
from the Contactor/Starter Coil.
Optional Outdoor Air Damper Control
If the customer’s system has an Outdoor/Fresh Air Damper
that must be opened or closed by the unit during system
start and occupancy schedule, the terminal blocks for
interlocking this function are TB-OAD – 1 and TB-OAD –
2. Determine whether the Hot or Common/Neutral shall be
wired through the contacts for Outdoor Air Damper interlock.
Next, install two conductors 16 – 18 AWG minimum 300 volt
rated from the Outdoor Air Damper Actuator’s location to
the unit’s terminal blocks TB-OAD. Connect the wires as
follows:
Wiring at the Outdoor Air Damper
1. Connect the Common wire at the Damper Actuator to
terminal TB-OAD – 1 inside the unit’s electrical box.
2. Connect the 24 vac wire at the Damper Actuator to
terminal TB-OAD – 2 inside the unit’s electrical box.
Optional Smoke Detector
If the factory ordered smoke detector option is provided,
four terminations shall be required. Follow the installation/
Subject to change without notice. 120.9-IM (1218)
20
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