CommStat™ Touch
PRODUCT DATA SHEET/USER MANUAL
Controller with IPv4/IPv6 Remote Access and Touch Screen Interface for
Redundant Telecom HVAC Systems
The CommStat Touch telecom controller with a touch screen
interface is designed to allow remote control and monitoring of
Marvair air conditioners and heat pumps with single or 2-stage
compressors in a shelter or enclosure and is certified by ETL for
HVAC UL60950-1 and FCC47CFR compliance. In addition to the
control of HVAC equipment, CommStat Touch provides status
information, alarm notifications, set point adjustment, and remote
HVAC configuration.
CommStat Touch is factory programmed with standard industry set
points, but can be configured on site or remotely and includes the
Marvair RemoteLink IPv4/IPv6 communication module and the latest
generation CommStat 4 PLC-based telecom controller. A standard
Category 5 ethernet cable connects CommStat Touch to the shelter
local network.
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Description & Specifications..................2
Installation...............................................8
Operation - Touch Screen.....................14
Operation - Remote Access...................20
Settings and Modes..............................27
Testing the CommStat Touch................34
Manufactured By:
Marvair® Division of AIRXCEL®, Inc.
P.O. Box 400 • Cordele, Georgia 31010
156 Seedling Drive • Cordele, Georgia 31015
(229) 273-3636 • Fax (229) 273-5154
E-mail: marvairtech@airxcel.com • Internet: www.marvair.com
The most current version of this manual can be found at www.marvair.com.
1
Features and Benefits
Programmable Logic Board
• Balanced Use of Conditioning Equipment
• Sequence the Operation of Two ComPac Units
• Ensures Maximum Efficiency
• Independent Economizer Control
Remote Access & Control with Touch Screen for
Any Marvair CommStat HVAC Controller
• Connect to Any Network Using the IPv4 or IPv6
Networking Protocol
• Complete System or Upgrade Existing CommStat 4
• Easy-to-Use Touch Screen Graphical Interface
• Remote Monitoring & Configuration
Remote Status and Control
• Shelter Temperature
• Alarms/Lockouts
• Utility Power/Generator Status
• Lead/Lag Status
• Economizer/DX Cooling/Heat Status
• Set Points
• Change Set Points
• Reset Alarms
• Swap Lead
• Change Stage Differentials
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
P/N 03267
Chapter 1 Description & Specifications
Specifications/Features
➤ Remote Status, Monitoring, and Configuration
The CommStat Touch connects to a Network Operation Center (NOC) to provide two-way communication and control functions.
Shelter conditions and HVAC status can be monitored and settings changed without the need to physically visit the site. Alarms are
displayed and can be reset remotely or by using the touch screen.
➤ Control Up To Four Air Conditioners Or Heat Pumps In a Shelter
The CommStat Touch has the capability to be daisy chained with a second CommStat Touch controller for controlling up to four air
conditioners or heat pumps in a shelter. When a CommStat Touch controller is daisy chained with a CommStat 4 in a Master/Slave
configuration, any settings to the Master unit immediately take effect on the Slave unit. The interface for the daisy chain is an RJ11
connector.
➤ Ease of Control and Configuration
A large, backlit touch screen LCD display shows the status of the system and provides a convenient user interface. Status indicators
for Heat, Cool, Power, Alarms and the Lead Unit are always displayed. When a fault is detected, an alarm symbol flashes and the LCD
screen displays the fault. If multiple faults are detected, they will be displayed on the touchscreen and the remote interface.
The CommStat Touch is easily configured using the built-in graphical display. A Comfort button changes the temperature in the
shelter for 90 minutes. After 90 minutes, the temperature reverts back to the programmed set points. A lead swap button alternates
the lead and lag unit, allowing service technicians to quickly check the operation of each unit.
For security, the keypad can be locked out to prevent unwanted changes to the set points. °F or °C units are selectable.
➤ RoHS Compliant
The CommStat Touch controller contains no hazardous materials and is RoHS compliant.
➤ Thermostat
• Cooling Set Point: 65°F through 95°F
(18°C through 35°C) in 1° increments.
• Heating Set Point: 50°F through 80°F
(10°C through 27°C) in 1° increments.
➤ Differential
• All stages ON differential: 1°F through 5°F
(1° through 3°C) in 1° increments.
• All stages OFF differential: 1°F through 5°F
(1° through 3°C) in 1° increments. The 2nd stage differential is referenced to the 1st stage differential and the
outputs will stage off as each stage’s differential is satisfied.
• Changeover Differential between cooling and heating: Minimum of 3°F (2°C).
• 3rd stage cooling Differential: 0°F through 7°F
(0°C through 4°C) in 1° increments
➤ Control Voltage
• The CommStat Touch is powered by 24 VDC or 48 VDC power supply. Should AC power be lost, the display, user
interface and the alarm outputs remain functional. System outputs (Y, G, W, O and the Mixed Air Relay) will not be
functional when 24 VAC is not present. If the control voltage is not present, the Low Voltage Loss alarm relay is
energized and displayed on the screen.
➤ Operating Range: -40°F through 150°F
(-40°C through 66°C)
➤ Minimum/Maximum AC Voltage: 18/30 VAC
➤ Minimum/Maximum DC Voltage: 20/60 VDC
➤ Ease of Installation
• Wiring connection insensitive to phasing of the units.
• Easy terminal connections for thermostat wire.
• Remote temperature sensors insure accurate temperature readings in the shelter.
• Easy attachment to the wall.
➤ Lead/Lag Operation
• User selectable changeover from ½ to 7 days in ½ day increments or automatic changeover on each call for cooling
or heating. If the lead unit loses power, the lag unit automatically becomes the lead unit with all the set points of
the lead unit. A lead swap button alternates the lead and lag unit, allowing service technicians to easily check the
operation of each unit.
Marvair
Marvair CommStat
CommStat Touch
Touch PDS/Manual,
PDS/Manual, 06/2017
02/2018 New
Rev.2
22
Alarms
Dry contacts can be used for remote alarm or notification. Relays can be wired Normally Open (NO) or Normally Closed (NC). Alarms
can be reset by pressing the "Reset Alarms" button on the status screen. All alarms remain functional when 24 VAC is not present.
• Low (Control) Voltage – activated if 24 VAC control voltage is not present.
• Lockout – activated if any air conditioner or heat pump is off due to either high or low refrigerant pressure lockout.
If all the air conditioners or heat pumps are locked out, the Mixed Air Relay (MAR) will be activated on each of the
air conditioners or heat pumps. This air conditioner or heat pump will go into the Ventilation mode, provided there
is a call for cooling. (Note: The Mixed Air Relay is only on units with an economizer) If desired, the lockout alarm can
be disabled by the user in the Configuration Set-up.
• Low Building Temperature Alarm – Activated if the temperature in the building drops to the selected temperature. If
the low building temperature alarm is activated, the LCD displays, “Low Building Temperature”.
• First Stage High Building Temperature Warning – If the set point temperature is reached, the display will show, “First
Stage High Building Temperature” on the LCD display.
• Second Stage High Building Temperature Alarm- Activated if the set point temperature is reached, the display will
show, “Second Stage High Building Temperature” on the LCD display.
• Smoke Alarm – the contacts will be energized when the smoke detector inputs receive a signal from an external
detector. All air conditioners or heat pumps are immediately shut down. A physical reset is required to clear the
alarm in the manual mode. If auto reset has been selected, the alarm will reset after the user specified time (3-10
minutes). Smoke Alarm will be displayed on the screen.
• AUX1 and AUX2 – Two auxiliary dry contact outputs that can be energized based upon AUX1 and AUX2 inputs. See
AUX1-IN/AUX2 INPUT on page 4 for complete description.
CommStat Touch Lead/Lag Controller Inputs
1. 24 VAC Control Voltage
The R and C terminals are the 24 VAC input power terminals for each respective air conditioner or heat pump.
2. 24/48 VDC Controller Power
The CommStat Touch is powered by 24 VDC or 48 VDC. Should AC power be lost, the display, user interface and alarm
outputs of the CommStat Touch will still be functional. However, the system outputs of the CommStat Touch (Y, G, W,
O, and MAR) will not be functional when 24 VAC is not present.
Note: DC power is polarity sensitive.
3. Temperature Sensors
The CommStat Touch uses remote temperature sensor(s) to measure the temperature in the shelter and determine
when the system is calling for heating or cooling. Up to three sensors can be connected to each CommStat Touch.
There are two options for the sensors. If No (the default setting) is selected and multiple sensors are being used, the
temperatures will be averaged. If Yes is selected and multiple sensors are being used, the sensor with the highest
reading will be used for cooling operation and the one with the lowest reading will be used for heating. When
multiple sensors are being used and there is a temperature differential greater than or equal to 5°F (4°C) between
the sensors, the CommStat Touch lead/lag controller will energize the indoor blowers (G) on all connected units.
Screen #20 in the Configuration Mode allows the user to determine how the temperature sensors will be configured.
4. Smoke Detector
The smoke detector input terminals determine when there is a signal from an external smoke detector. They can
be configured for either a Normally Open (N.O.) or Normally Closed (N.C.) smoke signal in Configuration screen # 18.
During a smoke fault condition, all AC units will be turned off.
The smoke alarm relay reset has two selections -Manual and Auto (default). If Manual is selected, a physical reset of
the fault is required by touching the "Reset Alarms" button on the display or clicking the "Reset Alarms" button on the
remote interface. Cycling power will not reset a smoke fault if Manual is selected.
If Auto is selected the alarm will reset after an adjustable time delay of 3-10 minutes. The default is 5 minutes.
Screen #17 in the Configuration Mode allows the user to determine how the smoke alarm relay reset will be
configured. Alarm will be displayed on the screen and remote interface.
5. Hydrogen Detector
The hydrogen detector input terminals will determine when there is a 24 VAC signal from an external hydrogen
detector. The CommStat Touch will switch the lead unit to Emergency Ventilation mode (ComPac II air conditioners
or Classic heat pumps with economizers only) when high hydrogen levels are detected. It will switch back to normal
air conditioning mode once the hydrogen levels are acceptable and the 24 VAC signal is removed from the hydrogen
detector input terminals.
6. Generator Relay
The generator input will monitor for a 24 VAC signal which will be used to determine when the CommStat Touch
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Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
is operating on generator power. When 24 VAC is recognized at the generator relay input, the CommStat Touch
controller will only operate the units selected by the user in screen # 16 of the Configuration Menu. The options are:
1. to run only the lead unit (default),
2. the lead unit and one lag unit,
3. the lead unit and two lag units, or
4. the lead unit and three lag units.
Note: in the Generator Mode, only the Lead unit will operate in the Mechanical Cooling Mode; the economizer will
not operate in the Generator Mode. However, if a hydrogen fault occurs during the Generator Mode, the Mechanical
Cooling will be terminated on the Lead unit and the Lag unit will operate in the Economizer Mode. When set to
economizer configuration 1 or 2 in screen #19, the CommStat Touch will only allow the lead unit to operate in
mechanical cooling.
7. Lockout Relay (LOR)
The CommStat Touch has a lockout relay input (LOR) and will provide a Normally Open (NO) or Normally Closed (NC)
output in accordance to this input. This feature is enabled in the Configuration Mode, screen #10 by either selecting
0,1,2 or 3 (2 default). If 0 or 1 is selected, the control will turn the lockout relay output off and annunciate which
unit is locked out on the LCD display. If 2 or 3 is selected, the control will turn the lockout relay output on, energize
the lockout relay output (NO or NC), and annunciate which unit is locked out on the LCD display. If all the units are
locked out, the mixed air relay will be activated on each unit to provide emergency ventilation, provided there is a
call for cooling. The mixed air relay and emergency ventilation are only available on units with economizers.
Cycling power at the locked out air conditioner will reset the Lockout fault. A physical reset of the fault will be
required by pressing the Reset Alarms button.
8. AUX1-IN/AUX2/Economizer Status Monitoring
The CommStat Touch has the option for two, dry contact, auxiliary outputs that will energize based on the AUX1 and
AUX2 inputs. Each AUX input can be configured to look for a normally open (NO) or normally closed (NC) signal in
Configuration Mode, screens # 21 and # 22. Each screen will allow the user the option of NO, NC, or OFF to disable
the feature. Note: AUX1 and AUX2 are not available when the Economizer configuration 1 or 2 is selected in screen
19.
AUX1 and AUX2 are independent from the operation of the board and the air conditioners or heat pumps.
AUX 1 IN and AUX2 IN can only be used as auxiliary inputs when screen 19 setting is set to NO. When economizer
configuration 1 or 2 is selected, the AUX1 IN and AUX2 IN are used for economizer status monitoring.
CommStat Touch Lead/Lag Controller Outputs
(Refer to the Thermostat and Line Voltage Connection Schematic on page 11)
1. Y or 1
The Y or 1 output energizes the compressor when the economizer is not selected. Upon a call for cooling, the Y (1)
and O terminals are energized. On a call for 1st stage heating, the Y(1) output will be energized. There is a minimum
compressor time off delay of 3 minutes for the lead unit and 4 minutes for the lag unit.
2. G or 3
The G or 3 output terminal energizes the indoor fan during either heating or cooling.
3. W or 4
The W or 4 output terminal energizes the electric heat.
4. O (Heat Pumps) or Y2 (Air Conditioners with 2 Stage Compressors)
The O output terminal energizes the reversing valve on heat pumps. The valve is energized on a call for cooling. If
staged air conditioners are selected in Configuration screen #25, the O output becomes the second stage cooling
output, Y2.
5. Lockout Alarm
When enabled in screen #10 of the Configuration Menu, the CommStat Touch monitors the Lockout Relay (LOR)
input for a contact closure. If there is a contact closure between the LOR terminals, the control will turn off all
outputs, energize the NO or NC contacts, and display which unit is locked out on the touch screen display and remote
interface. The default setting in the configuration is 2. If all of the connected units are locked out, the Mixed Air
Relay (MAR) will be activated on each of the connected units and the units will go into Emergency Ventilation mode.
Cycling power will reset the Lockout Alarm or by pressing the Reset Alarms button.
6. Low (Control) Voltage Loss Alarm
The low voltage loss alarm relay provides a dry contact closure if 24VAC control voltage is not present.
7. Low Building Temperature Alarm
The Low Building Temperature Alarm has an adjustable temperature range of 32°F thru 65°F (0°C thru 18.3°C) that
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
4
may be adjusted in screen #8 of the configuration menu. If the temperature drops to this setting, all outputs will be
turned off, the touch screen display and remote interface will annunciate Low Building Temperature and the Low
Building Temperature alarm output relay will be activated. There is a 2°F (1°C) differential for this alarm to reset.
8. First Stage High Building Temperature Warning
The set point temperature is adjustable from 70°F thru 140°F (21°C thru 60°C). If this set point is reached, the
control will display a First Stage High Building Temperature warning. The default setting for this is 85°F (29°C).
There is a 2°F (1°C) differential for this alarm to reset. The first stage high temperature warning set point is
adjustable in screen #6 of the Configuration Menu.
9. Second Stage High Building Temperature Alarm
This set point is adjustable from 75°F thru 145°F (24°C thru 63°C). If this set point is reached, the control will
display a Second Stage High Building Temperature alarm. There is a 2°F (1°C) differential for this alarm to reset. The
temperature set point for the second stage high temperature alarm is adjustable in screen #7 of the Configuration
Menu. The default setting for this is 90°F (32°C).
10. Smoke alarm
The smoke alarm is energized when the smoke detector inputs sense a smoke fault condition. All outputs are off and
the smoke alarm relay is energized during a smoke fault. This is a dry contact output that can be configured for NO
or NC (default) operation in setting #18 of the configuration menu.
The smoke alarm has two selections -Manual and Auto (default). The smoke alarm relay can be manually reset by
touching the Reset Alarms button on the touch screen or clicking Reset Alarms using the remote interface..
If Auto is selected the alarm will reset after an adjustable time delay of 3-10 minutes, with a default time of 5
minutes. Screen #17 in the Configuration Mode allows the user to determine how the smoke alarm relay reset will be
configured.
11. Mixed Air Relay (MAR)
The MAR output will be energized by the CommStat Touch when all connected units have locked out. This is referred
to as the Emergency Ventilation Mode. The mixed air relay and Emergency ventilation are only available on units
with economizers.
12. DC Air Mover Relay (AMR)
The DC Air Mover Relay has a dry contact output and is energized in the Emergency Ventilation Mode.
13. AUX1 and AUX2
The CommStat Touch has the option for two, dry contact, auxiliary outputs that are energized based on the AUX1 and
AUX2 inputs. Each AUX input can be configured to look for a normally open (NO) or normally closed (NC) signal in
configuration screens #21 and #22. Each configuration screen allows the user the option of NO, NC, or OFF (default)
to disable the feature. The AUX1 and AUX2 outputs provide a NO, NC, and COM terminal. Note: AUX1 and AUX2
inputs are not available when the Economizer configuration 1 or 2 is selected in screen 19. The AUX 1 and AUX 2 are
used for Economizer status monitoring when Setting 19 is set to Mode 1 or 2 (2 is default).
Important Safety Precautions
WARNING
ALWAYS TURN OFF POWER AT THE MAIN AC AND DC POWER SUPPLY BEFORE INSTALLING,
CLEANING, OR REMOVING THERMOSTAT.
WARNING
DO NOT USE BATTERY OPERATED OR ELECTRIC TOOLS TO TIGHTEN SCREWS ON COVER OF THE
COMMSTAT TOUCH.
• This thermostat is for 24 VAC applications only with 24/48VDC backup power; do not use on voltages over 30 VAC or
60 VDC
• Do not short across terminals of system control to test operation; this will damage your thermostat and may void
your warranty
• All wiring must conform to local and national electrical and building codes
• Use this thermostat only as described in this manual
5
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
IMPORTANT
CommStat Touch DC power is polarity sensitive. Use a multimeter to check polarity before making
power connections.
➤ Verifying DC Voltage Polarity
1. Turn the DC breaker/disconnect in the air conditioner to the OFF position.
2. Turn DC breaker in the shelter’s DC power plant to the ON position.
3. Place the RED test probe on the + (positive) terminal and the BLACK probe on the – (negative) terminal at the
top of the breaker/disconnect as shown.
Note: Breaker shown for reference only. Appearance may vary depending on the HVAC unit configuration.
DC Field Voltage
Connections at Top of the
Breaker
DC Field Voltage
Connections at Bottom of
the Breaker
4.
5. If the test meter reads a NEGATIVE voltage turn OFF the DC power to the breaker/disconnect and reverse the
power leads on the input of the DC breaker in the air conditioner.
Indication of Negative
DC Voltage
6. Turn DC breaker in the shelter’s DC power plant to the ON position.
Indication of Positive
DC Voltage
7. Repeat step 3 to make certain that the DC power is POSITIVE voltage.
8. When the test meter reads POSITIVE, the DC breaker/disconnect in the air conditioner can be switched to the ON
position.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
6
Ports and Connections
Left Side
Front
1
Right Side
4
3
2
5
Back
Number
Description
1
Touch Screen interface
2
Ethernet Port for network communication
3
USB Port
4
24/48 VDC to 5 VDC Power Supply
5
RJ-11 CommStat Communication Cable
7
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Chapter 2 Installation
CommStat Touch Installation
WARNING
TURN OFF POWER TO THE HVAC UNIT BEFORE INSTALLING THE COMMSTAT TOUCH.
WARNING
ELECTRICAL SHOCK HAZARD
TURN OFF POWER AT THE MAIN SERVICE PANEL BY REMOVING THE AC AND DC FUSES OR
SWITCHING THE APPROPRIATE CIRCUIT BREAKER TO THE OFF POSITION BEFORE REMOVING
THE EXISTING THERMOSTAT.
WARNING
THE UNIT IS INTENDED TO BE INSTALLED BY A QUALIFIED PERSONNEL IN ACCORDANCE WITH
LOCAL AND NATIONAL REGULATIONS OR CODES E.G. NEC IN USA AND CEC IN CANADA.
IMPORTANT
CommStat Touch installation must conform to local and national building and electrical codes and
ordinances.
➤ Items Required to Install the CommStat Touch (only if remote communication is required):
1. Cat 5 ethernet cable to connect the CommStat Touch to the local network or NOC (provided by installer)
2. Laptop PC to test and configure the CommStat Touch
➤ CommStat Touch Power and Communication Connections:
1. Mount the CommStat Touch in a suitable location close to the 24/48 VDC power source, and the local network.
Note: Mount the CommStat Touch about five feet above the floor. Do not mount the CommStat Touch, in direct
sunlight, behind a door, or in an area affected by a vent or duct. The CommStat Touch is designed for interior use
only.
2. Connect the 24 or 48 VDC postive (+) and negative (-) input to the provided wire leads marked DC+ and DC-. See
factory and field wiring diagrams on pages 9 and 10.
3. A Cat 5 ethernet cable is required to connect the RemoteLink to the local network or NOC.
Note: Only if remote communication is required.
4. Turn off power to the heating and cooling system by turning off DC power or removing the fuse or switching off
the appropriate circuit breaker.
5. Put controller against the wall where you plan to mount it (Be sure wires will feed through the wire opening in
the base of the CommStat Touch).
6. Mark the placement of the mounting holes.
7. Using a drill bit, drill holes in the places you have marked for mounting.
8. Align CommStat Touch with mounting holes and feed the control wires through wire opening.
9. Use screws to mount CommStat Touch to wall.
10.Insert stripped, labeled wires in matching wire terminals. See Wiring Diagrams. CAUTION!: Be sure exposed
portion of wires do not touch other wires.
11.Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper
terminal.
12.Seal hole for wires behind CommStat Touch with non-flammable insulation or putty.
13.Replace cover on CommStat Touch.
14.Turn on power to the system at the main service panel and DC power supply.
15.Test CommStat Touch operation as described in “Testing the CommStat Touch”.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
8
CommStat Touch Factory Factory Wiring Diagram
9
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
CommStat Touch Factory Field Wiring Diagram
with the Engineering Designator "VZ"
Optional Accessories
• Onboard Sensor (P/N 50189)
• Expansion Cable (P/N 80515) To be used when a CommStat Touch controller is installed in a Master/Slave
configuration with a CommStat 4.
• Remote sensor with 25 ft. (762 cm) cable. P/N 80503
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
10
Thermostat and Line Voltage Connections Schematic for Marvair Air Conditioners
with the Engineering Designator "A5"
11
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Dimensional Data
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
12
Alarm Connections Schematic
13
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Chapter 3 Operation - Touch Screen
Operating the CommStat Touch Telecom HVAC Controller
➤ CommStat Touch Boot Up
The CommStat Touch automatically boots up when power is applied. Upon boot up, There is a 30 second pause to
allow the user to enter the Configuration Mode. Tapping the Setup Wizard button will go directly to the configuration
Wizard mode (see CommStat Touch Interface Configuration Screen later in this section). If no buttons are tapped during
the 30 second pause, CommStat Touch will automatically redirect to the System Status Screen.
1
2
Number
Description
1
Tap to skip the boot up pause and go directly to the System Status screen.
2
Tap to enter the configuration Wizard mode.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
14
➤ CommStat Touch Interface System Status Screen
The CommStat Touch provides local and remote monitoring and control of the integrated Marvair CommStat telecom
controller. The HTML-based interface refreshes automatically every 30 seconds to display the system status and
alarms. Note: After an input is made, there may be a delay of up to 2 minutes before the new settings/parameters are
displayed. This delay is a normal function and is not indicative of a malfunction or communication error.
1
2
3
4
5
5
6
8
5
5
7
9
10
Number
11
12 13
14 15
16
Description
1
"On" Indicates 24/48VDC power is present at the CommStat Touch HVAC controller.
2
Shelter interior temperature display (actual inside temperature, not set point).
3
Indicates installed CommStat firmware version.
4
CommStat communication protocol version.
5
Tap the Set as Lead button to alternate the Lead and Lag units. Functional only when in the Normal or Comfort operating mode and
both units are operational.
6
HVAC Unit #1 System Status Overview (Master Controller if Configured for Master/Slave).
7
See the following table for details on HVAC Unit #2 System Status Overview (Master Controller if Configured for Master/Slave).
the Status Overview
HVAC Unit #1 System Status Overview (Slave Controller if Configured for Master/Slave).
8
9
10
HVAC Unit #2 System Status Overview (Slave Controller if Configured for Master/Slave).
Comfort Mode allows the service tech to be comfortable while working in the shelter. Tapping the Comfort On/Off button
once during normal operation enters Comfort Mode. The CommStat Touch will revert to normal operation after 90 minutes
in the Comfort mode. It can also be removed from Comfort mode manually by tapping the Comfort On/Off button once.
By reverting back to the desired set points after 90 minutes, energy costs can be minimized if the tech fails to cancel Comfort Mode.
A blue Comfort Mode icon will flash on the display whenever Comfort Mode is active.
11
The CommStat Touch automatically refreshes every 30 seconds. To force an immediate refresh, tap the Refresh View button.
12
Error message scroll. In the event of multiple errors, tap either button to scroll through error notifications.
13
Tap to enter the CommStat Touch Configuration mode.
14
In the event of an alarm, notification icons display in this area.
15
Turn the CommStat On or Off.
16
Tap to reset the alarm display after the fault causing the alarm(s) has been corrected.
15
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
System Status Overview Details
Power:
On
Indicates Power to the HVAC unit
Off
Indicates No Power to the HVAC unit
Lead Unit 1st Stage Cooling - Lag Unit Off
Cool 1*
Cool 3*
Lead Unit 2nd Stage Cooling, Lag Unit Off
Lead Unit 2nd Stage Cooling - Lag Unit 1st Stage Cooling
Cool 4*
Lead Unit 2nd Stage Cooling - Lag Unit 2nd Stage Cooling
-
Lag Unit is Off
Lead
Identifies whether unit is currently set to Lead
Cool 2*
Mode:
Lead/Lag:
Lag
Identifies whether unit is currently set to Lag
*In Modes 1 and 2, the Mode will only be displayed for the Lead unit. In modes 3 and 4, the Lead and Lag units will display the same mode status.
➤ CommStat Touch Interface Configuration Screen
To enter the Configuration mode, tap the Setup Wizard button immediately after boot up, or the Configuration button
on the System Status screen (item 13 on the previous page).
The CommStat Touch features two methods of inputting its settings:
• Wizard (default): Step through each setting sequentially (see settings table beginning on page 27)
• Menu: Quick access to each individual setting.
Wizard Mode Operation:
To enter Wizard Mode, tap the Configuration button on the System Status screen or on the boot up screen. To exit the
configuration wizard, tap the Cancel key.
1
2
Number
3
4
5
Description
1
Setting information and available selections.
2
Tap to return to the previous setting.
3
Exit the Configuration mode and return to the System Status screen
4
You must tap the Save button to store any new settings.
5
Tap to enter the Configuration menu for quick access to individual settings.
6
Tap to advance to the next setting.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
16
6
Menu Mode Operation:
To enter Menu Mode, tap the Configuration button on the System Status screen or on the boot up screen. Then tap the
Menu button. To exit the configuration menu, tap the Cancel key. Note: All changes must be made sequencially - Only
one setting may be changed and saved at a time.
1
2
Number
3
4
Description
1
Available Settings. Tap the button or refer to the settings table on page 27 for details of each setting.
2
Tap to return to the previous menu page.
3
Exit the Configuration mode and return to the System Status screen
4
Tap to advance to the next menu page.
➤ CommStat Touch Configuration Input Entry
Depending on the type of input, the CommStat Touch uses one of two input methods:
• Radio Button: Used to select from a group of pre-defined parameters.
• Text Entry: Used to enter numerical values.
Example of Radio Button
Example of Text Entry
The current setting is shown with a green highlight. To change a setting using a Radio Button, tap an un-highlighted
button next to the desired setting as shown below.
Tap Here
17
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Once a selection is made, tap the Save button to store the new setting.
To make a selection using Text Entry, tap anywhere in the empty field next to the desired setting as shown below.
Tap Here
This will open the appropriate setting panel as shown below.
0.5
The current setting and acceptable range of new settings are displayed. Tap the number keys to input a new setting
and then tap the Apply button. To clear the new settings and return to the previous screen, tap the Cancel button.
Once the Apply button is tapped, the display returns to the previous screen with the new setting displayed. Tap Save to
store the new setting.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
18
➤ CommStat Touch Alarm Reset
If an alarm is present, the CommStat Touch will display the relevant alarm (1). If more than one alarm is active, use
the scroll buttons (2, 3) to view all alarms.
After the cause of the alarm has been corrected, tap the Reset Alarms button (4) to clear the alarm warning.
Note: The alarm notifications do not clear automatically. They must be reset manually.
2
1
3
4
Master Unit 1
Lo/Hi Pressure Lockout
Master Unit 2
Lo/Hi Pressure Lockout
Slave Unit 1
Lo/Hi Pressure Lockout
Slave Unit 2
Lo/Hi Pressure Lockout
First Stage
High Temperature
Low Building Temperature
Loss of Low Voltage from
Unit to Controller
Smoke Detected
Inside Building
Hydrogen Detected
Inside Building
Comfort Mode Active
(Not an alarm indication)
19
Second Stage
High Temperature
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Chapter 4 Operation - Remote Access
CommStat RemoteLink Testing and Configuration
➤ Items Required to Test and Configure the CommStat RemoteLink (only if remote communication is required):
1. USB keyboard
➤ Test and Configure the CommStat RemoteLink:
1.
2.
3.
4.
Make sure the RemoteLink is not powered.
Connect keyboard to any available CommStat Touch USB port (Item #3 in Ports and Connections on page 7).
Simultaneously press the Control (CNTRL) and Escape (ESC) keys to access the system menu.
Using the arrow keys, or the touch screen, select UXTerm from the System Tools menu.
5. You will be automatically logged in as the user "commstat@commstat4" and able to enter the test and
configuration program.
commstat@commstat4: ~
_
x
commstat@commstat4:"$
6. If a static IPv6 address is to be assigned to the CommStat4 RemoteLink, at the “commstat@commstat4:"$”
command prompt, type “sudo ./staticip [ipv6 address] [netmask]” (no quotes or brackets) and
press <enter>.
7. IPv6 address = ipv6 address in valid format (see IPv6 format information contained in the Assigning a Static IPv6
IP Address section below).
8. Netmask = decimal number for the netmask.
9. If successful, the Ethernet connection will be restarted and reflect the new static IP address.
10.At the “$” command prompt, type “ip addr show eth0” and press <enter> to confirm the network settings.
11.The IPv6 address you just set should be shown as one of the “inet6” addresses as show in the example below.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
20
commstat@commstat4: ~
_
x
commstat@commstat4:"$
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link:ether b8:27:eb:60:0e:d3 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.2/24 brd 192.168.7.255 scope global eth0
valid_lft forever preferred lft forever
inet6 fe80::fd7a:4559:3200:94bf64 scope link
valid_lft forever preferred_lft forever
12.When you are finished, tap the "X" in the upper right corner of the UXTerm window. This will exit the test and
configuration program.
Tap here to exit UXTerm
commstat@commstat4: ~
_
x
commstat@commstat4:"$
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link:ether b8:27:eb:60:0e:d3 brd ff:ff:ff:ff:ff:ff
inet 192.168.7.2/24 brd 192.168.7.255 scope global eth0
valid_lft forever preferred lft forever
inet6 fe80::fd7a:4559:3200:94bf64 scope link
valid_lft forever preferred_lft forever
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Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
CommStat RemoteLink Interface
➤ CommStat RemoteLink Interface Overview
The CommStat RemoteLink provides remote monitoring and control of the Marvair CommStat telecom controller,
but it is not designed for real-time monitoring. The HTML-based interface refreshes automatically every 30 seconds
to display the CommStat status and alarms. Note: After an input is made, there may be a delay of up to 2 minutes
before the new settings/parameters are displayed. This delay is a normal function of the RemoteLink device and is not
indicative of a malfunction or communication error.
1
2
4
3
5
6
7
8
9
Number
Description
1
System Status Overview
2
HVAC Unit #1 Status Overview (Master Controller if Configured for Master/Slave)
3
HVAC Unit #2 Status Overview (Master Controller if Configured for Master/Slave)
4
HVAC Unit #1 Status Overview (Slave Controller if Configured for Master/Slave)
5
HVAC Unit #2 Status Overview (Slave Controller if Configured for Master/Slave)
6
Alarm Status
7
Menu Selections
8
Configuration/Settings
9
Pop-Up Tool Tips Provide Additional Details and Instructions for Each Configuration/Setting
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
22
➤ CommStat RemoteLink System Status
The System Status portion of the interface is at the top of each screen and displays the HVAC system status, shelter
conditions, software version information, and the swap Lead/Lag buttons.
Label
Function
Options
Master
CommStat master controller status if using master/slave configuration
N/A
Slave
CommStat slave controller status if using master/slave configuration
N/A
Unit 1/Unit 2
Identifies each HVAC unit in a lead/lag configuration
N/A
Set as Lead
Click to swap lead/lag between Unit #1 and Unit #2
N/A
Lead
Identifies which unit is currently set to Lead
On |
Off
Power
Indicates Power to the HVAC unit
On |
Off
Heat/Cool/Econ
Indicates unit operating mode (Heat, Cooling, Economizer)
On |
Off
CommStat Power
Indicates low voltage power is present at the CommStat HVAC controller
On |
Off
Shelter Temperature
Indicates the shelter or enclosure interior temperature
Utility Power
Indicates high voltage power is present at the HVAC units
On |
Off
Generator Power
If illuminated, the backup generator is supplying power to the shelter or enclosure
On |
Off
Firmware Version
CommStat HVAC controller firmware version (version 68 or later required for RemoteLink)
N/A
Protocol Version
CommStat HVAC controller protocol version (version 5 or later required for RemoteLink)
N/A
N/A
➤ CommStat RemoteLink Alarms
Dry contacts can be used for remote alarm or notification. Relays can be wired Normally Open (NO) or Normally
Closed (NC). Most alarm relays can be reset by clicking the Reset Alarms button.
Label
Function
Reset Alarms
After the cause of the alarm has been corrected, click the Reset Alarms button to reset the
alarm status
1st Stage Hi Temp
Activated if the 1st Stage High Temperature Alarm set point temperature is reached
Active |
No Alarm
2nd Stage Hi Temp
Activated if the 2nd Stage High Temperature Alarm set point temperature is reached
Active |
No Alarm
Lo Bldg Temp
Activated if the temperature in the building drops to the Low Building Temperature set point
Active |
No Alarm
Hydrogen
Activated if hydrogen is detected inside the building
Active |
No Alarm
Smoke
Activated if the smoke detector inputs receive a signal from an external detector. All air
conditioners or heat pumps are immediately shut down
Active |
No Alarm
Low Voltage Loss
Activated if control voltage is not present
Active |
No Alarm
Unit 1 HP/LP Lockout Activated if Unit #1 is off due to either high or low refrigerant pressure lockout
Active |
No Alarm
Unit 2 HP/LP Lockout Activated if Unit #2 is off due to either high or low refrigerant pressure lockout
Active |
No Alarm
23
Alarm Status
N/A
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
➤ CommStat RemoteLink Menu Selections
Use these buttons to choose the group of settings to adjust.
Label
Function
Basic Configuration
Used to set the CommStat basic parameters
Set Points
Heating, Cooling, Stage Differential set points
Configurations
Timer and Delay settings
System Type
Select Economizer or Non-Economizer and number of compressor stages
Alarms
Alarm threshold set points
➤ CommStat RemoteLink Basic Configuration
Use this of settings to adjust to CommStat basic configurations. After entering the setting value, click the Apply
button. Changes are applied immediately to the CommStat, however it may take between 30 seconds and 2 minutes
for the status to update via RemoteLink. For detailed information about each setting, see the settings table at the end
of this manual.
Note: The CommStat RemoteLink will only recognize one setting change at a time. Additional changes will not be
saved by the system.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
24
➤ CommStat RemoteLink Set Points
Use this of settings to adjust to CommStat Set Points. After entering the setting value, click the Apply button. Changes
are applied immediately to the CommStat, however it may take between 30 seconds and 2 minutes for the status to
update via RemoteLink. For detailed information about each setting, see the settings table at the end of this manual.
➤ CommStat RemoteLink Configurations
Use this of settings to adjust to CommStat Set Points. After entering the setting value, click the Apply button. Changes
are applied immediately to the CommStat, however it may take between 30 seconds and 2 minutes for the status to
update via RemoteLink. For detailed information about each setting, see the settings table at the end of this manual.
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Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
➤ CommStat RemoteLink System Type
Use this of settings to adjust to CommStat System Type. After entering the setting value, click the Apply button.
Changes are applied immediately to the CommStat, however it may take between 30 seconds and 2 minutes for the
status to update via RemoteLink. For detailed information about each setting, see the settings table at the end of this
manual.
➤ CommStat RemoteLink Alarms
Use this of settings to adjust to CommStat Alarm Set Points. After entering the setting value, click the Apply button.
Changes are applied immediately to the CommStat, however it may take between 30 seconds and 2 minutes for the
status to update via RemoteLink. For detailed information about each alarm setting, see the settings table at the end
of this manual.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
26
Chapter 5 Settings and Modes
CommStat Touch Lead/Lag Controller Settings Table
Screen
Number
1
2
Description
Default
Keypad Lockout
Select OFF to disable lockout or a 3-digit number to enable lockout. ( 9,9,9 is the default password)
OFF
3
°F or °C
Lead/Lag air conditioner changeover. 0.5 to 7 days in ½ day increments
4
Cooling set point. 65°F thru 95°F (18°C thru 35°C) in 1° increments
79°F (24°C)
5
Heat set point. 50°F thru 80°F (10°C thru 27°C) in 1° increments
65°F (18°C)
6
First stage high temperature warning set point. 70°F thru 140°F (21°C thru 60°C) in 1° increments
85°F (29°C)
7
Second stage high temperature alarm set point. 75°F thru 145°F (24°C thru 63°C) in 1° increments.
8
9
Low building temperature alarm set point. 32°F thru 65°F (0°C thru 18°C) in 1° increments
Continuous indoor blower on all units. Select ON, AUTO or ON (Lead only)
Alarms
0 = No alarm output. Screen does not display High voltage fail.
1 = No alarm output. High voltage input required.
2 = Alarm output. Screen does not display High voltage fail.
Anti-short cycle timer. 0 = no delay or 3-10 minutes in 1 minute increments. The Time Delay in the HVAC
unit should be set to 0 if the default value of 5 minutes is selected.
1st stage temperature differential 1°F thru 5°F (1°C thru 3°C) in 1° increments. This setting only affects
the turning on of the system. The turn off differential is fixed at 1°F/C.
2nd stage temperature differential 2°F thru 5°F (1°C thru 3°C) in 1° increments. This differential is in
reference to the 1st stage differential and the outputs are staged off each stage’s differential is satisfied.
OFF differential option of all stages. 1°F thru 4°F (1°C thru 3°C) in 1° increments. The actual differential OFF
setting range is limited by the factory set dead band of 3°F/3°C minimum separation between Heat & Cool set
points.
10
11
12
13
14
°F
7 days
90°F (32°C)
45°F (7.2°C)
AUTO (Lead Only)
2
0
1°F (1°C)
1°F (2°C)
4°F (2°C)
15
Indoor blower off time delay. 0-90 seconds in 1 second increments
16
Operation of units on generator power. See page 3 for description of options.
1 = Lead unit only NOTE: Economizer Mode 2 will ONLY allow Lead unit operation regardless of number of
units selected
2 = Lead unit & one lag unit
3 = Lead unit and two lag units
4 = Lead unit and three lag units
17
Smoke alarm relay reset.
Select either manual or automatic reset. If an automatic reset is desired, select the number of minutes – from
3 to 10. The default is 5 minutes. The smoke alarm relay can be manually reset by holding the UP & DOWN
buttons for 4 seconds or by cycling the 24 VAC power to clear the fault.
18
Smoke detector contacts Normally Open or Normally Closed. When configured for N.O., an open circuit between
the smoke terminals will be considered a smoke fault. When configured for N.C., a closed circuit between the
smoke input terminals will be considered a smoke fault.
19
Economizer Configuration
No = ComPac I unit, no economizer
1 = ComPac II units with economizer using operational mode #1
2 = ComPac II units using economizer operational mode #2 (See economizer modes descriptions on page 29)
20
Remote temperature Sensor(s). If No (the default) is selected and multiple sensors are being used, the
temperatures will be averaged. If multiple sensors are being used and Yes is selected, the sensor with the
highest temperature reading will be used to control the units when in the cooling mode. In heating, the sensor
with the lowest reading will be used to control the units.
Yes
21
AUX 1 dry contact output. Selection are:
NO = Output will be energized when there is no contact closure between the AUX1-IN terminals.
NC = Output will be energized when there is contact closure between the AUX1-IN terminals
OFF = Disabled. When configuration screen #19 is set to 1 or 2, this configuration screen is not accessible.
Off
22
AUX 2 dry contact output. Selection are:
NO = Output will be energized when there is no contact closure between the AUX2-IN terminals.
NC = Output will be energized when there is contact closure between the AUX2-IN terminals
OFF = Disabled. When configuration screen #19 is set to 1 or 2, this configuration screen is not accessible.
Off
27
90 seconds
1
5 Minutes
Normally Closed
2
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Screen
Number
Description
Default
23
Excessive compressor operation. Select between 5-10 cycles per two hour period or “No” to disable. When set
between 5-10 cycles and the compressor cycles more than the set point, the first stage differential will increase
by 2°F (1°C).
24
Language Select either English, French or Spanish
25
Select either 1-stage air conditioner, 2-stage air conditioner or heat pump.
1 = 1-stage air conditioner
2 = 2-stage air conditioner
No = Heat pump
26
Master/Slave setting. When connected to another CommStat Touch, the user selects whether this unit is the
Master (Yes) or Slave (No).
NO
English
27-36
Set the differential between stages from 0°F through 7°F (0°C through 4°C) in 1° increments. The screens are
only visible when using two CommStat Touch controllers in a Master/Slave configuration. Screens 27-36 are only
used with multi-stage air conditioners and heat pumps with electric heat.
37
This setting is used to select the number of HVAC units used in the application. Selecting the correct number of
HVAC units will eliminate nuisance alarms.
1 = One HVAC unit connected to the CommStat Touch.
2 = Two HVAC units connected to the CommStat Touch. One lead and one lag unit.
3 = Three HVAC units connected to the CommStat Touch. One lead and two lag units.
4 = Four HVAC units connected to the CommStat Touch. One lead unit and 3 lag units.
38
Economizer Stage Differential. 1°F thru 5°F (1°C thru 3°C) in 1° increments.
This setting provides an adjustable temperature differential between stages of Economizer Cooling only. This
setting does not affect the stage differential of Mechanical Cooling.
2
Yes
#27: 5°F (3°C)
#28-36: 2°F (1°C)
2
1°F (1°C)
Economizer Operational Modes
The CommStat Touch provides for two Operational Modes for ComPac II air conditioners with economizers. The
desired mode can be selected in Configuration screen 19. For details, see the following Economizer Modes sections.
Emergency Ventilation Mode: The CommStat Touch will force all connected air conditioners to economizer operation if
all connected air conditioners are locked out upon a call for cooling.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
28
CommStat Touch Economizer Mode 1 with Two Single-Stage Compressors
with Cooling Set Point at 79ºF
29
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
CommStat Touch Economizer Mode 1 with Two 2-Stage Compressors
with Cooling Set Point at 79ºF
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
30
CommStat Touch Economizer Mode 2 with Two Single-Stage Compressors
with Cooling Set Point at 79ºF
31
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
CommStat Touch Economizer Mode 2 with Two 2-Stage Compressors
with Cooling Set Point at 79ºF
Or
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
32
CommStat Touch Adaptive Staging Sequence
OFF time between cooling calls
Wait time before going to 2nd stage on Lead Unit
Greater Than 8 Minutes
15 Minutes
Between 7 - 8 Minutes
10 Minutes
Between 6 - 7 Minutes
5 Minutes
Between 5 - 6 Minutes
2 Minutes
Between 4 - 5 Minutes
1 Minutes
Between 3 - 4 Minutes
40 Seconds
Less than 3 Minutes
20 Seconds
Adaptive staging is based on rate of change in temperature over time between Cooling calls on the Lead Unit. This assures
that the operating capacity of the HVAC is constantly matched for internal heat load while maintaining efficiency.
Note: Only available in Economizer Mode 2 with Two 2-Stage compressors.
CommStat Touch Humidity Control
Note: The humidity controller is only used to prevent economizer operation when the internal humidity level is greater
than the humidity setpoint. When the internal humidity level exceeds the humidity setpoint, the Lead unit will only
operate in DX cooling. The economizer is disabled until the internal humidity is below the humidity setpoint.
Changing dehumidifier settings:
1. Set dehumidifier by pressing the UP/DOWN arrows. RH% will change in increments of five.
• High Limit: 80%
• Low Limit: 5%
• Default: 80%
2. Press “More” to enter operation style. Press the UP/DOWN arrows to set.
• “Auto” runs dehumidifier automatically according to your RH% settings.
• “Off” turns the dehumidifier off.
3. Press “Done” to save settings, or “More” to enter ventilation settings.
More
Done
Down
Up
To Enter Installer Advanced Setup:
1. Press and hold the UP/DOWN arrows for 3 seconds.
2. Press “More” to advance to the next setup option. See table on next page.
3. Use the UP/DOWN arrows to select options.
4. Press “Done” at any time to save and return to the home screen.
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Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Chapter 6 Testing the CommStat Touch
Testing the CommStat Touch Thermostat Controller
➤ Check-Out of Cooling Cycle
Due the wide range of configurations, the following instructions are limited to checking the operation of the cooling
and heating modes. If alarm or fault conditions are displayed, recheck all field wiring and the configuration screens.
Important:
Be sure that the crankcase heater (if used) has been energized for at least 24 hours before starting the unit(s).
Double-check all electrical connections before applying power. ComPac® air conditioners with scroll compressors
running on 3Ø power must be checked for proper rotation during the initial start-up. Please refer to ComPac
Installation & Operation manual for determining if the 3Ø compressors are rotating correctly. Incorrect rotation can
damage the compressor and may not be covered by the warranty
Procedure:
1. In the Configuration screen No. 4, set the cooling set point temperature to a point higher than the ambient
temperature. In the Configuration screen No. 5, set the heating set point temperature to a temperature that is
lower than the ambient.
2. Set the time delay in the ComPac® I or ComPac® II A/C control box to three minutes. On ComPac II air
conditioners with the economizer, check the changeover setting of the sensor and reset it if needed. (See ComPac
air conditioner Installation & Operation manual).
3. Using configuration screen No. 4, slowly lower the thermostat's cooling set point temperature until the switch
closes. The indoor fan should operate. Once the indoor fan turns on, allow approximately three minutes (5
minutes if the default of 5 minutes is selected in screen number 11) for the compressor to start. Note that the
outdoor fan may not come on immediately, because it is cycled by refrigerant pressures.
NOTE: (ComPac® II A/C only). To check the system operation under different ambient conditions, the air
temperature and enthalpy sensors must be "tricked". When outdoor ambient conditions are higher than the
control setting, a component cooler aerosol may be sprayed directly into the enthalpy sensor to simulate low
enthalpy conditions, causing the economizer damper to open. Alternately, when outdoor conditions are lower
than the set point, a source of heat such as a hair dryer can be directed on the air temperature sensor to
simulate warmer conditions, which will bring on mechanical cooling and start the compressor.
4. To stop cooling, slowly raise the thermostat cooling set point to a temperature higher than the ambient. Follow
the same procedure for additional units.
NOTE: The fan purge allows the indoor fan to run for approximately 90 seconds after the compressor is off. This
operation provides a small improvement in system rated efficiency.
➤ Check-Out of Heating Cycle
Procedure: (Applies only to heat pumps or air conditioners with resistance elements)
1. Using Configuration screen No. 5, raise the heating set point temperature to a setting which is higher than the
ambient temperature. The fan and electric heat should immediately cycle on.
2.Move the system switch to the "OFF" position. All functions should stop.
NOTE: (ComPac® II A/C with economizer only) The damper blade should remain closed during the heating cycle
(unless the minimum position potentiometer has been set for constant ventilation A fully counterclockwise
position corresponds to full closure of the damper. See ComPac Installation & Operation manual for details.
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
34
Notes
Please consult the Marvair® website at www.marvair.com for the latest product literature. Detailed dimensional data is available upon
request. A complete warranty statement can be found in each product’s Installation/Operation Manual, on our website or by contacting
Marvair at 229-273-3636. As part of the Marvair continuous improvement program, specifications are subject to change without notice.
P.O. Box 400 • Cordele, GA 31010
156 Seedling Drive • Cordele, GA 31015
Ph: 229-273-3636 • Fax: 229-273-5154
Email: marvair@airxcel.com • Internet: www.marvair.com
35
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Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2
Marvair CommStat Touch PDS/Manual, 02/2018 Rev.2