marsdelivers 7602-444 Communicating Service Tool Instruction Manual
- June 13, 2024
- marsdelivers
Table of Contents
marsdelivers 7602-444 Communicating Service Tool Instruction Manual
1.0 Connection
Comfort-Aire/Century Communicating Service Tool 7602-444 allows install and
service technicians to configure and diagnose Comfort-Aire/Century Digital
Communicating Units without installing a digital communicating thermostat.
Using the Service Tool, a technician can ELECTRONICALLY:
-
Configure items like: airflow, heat pump options and configuration, pump or modulating valve operation, unit family, unit size, etc.
AND -
Diagnose the unit by operating it manually, performing control diagnostics, viewing dip switch configurations, or by viewing fault history and operating conditions when a fault occurred.
The Service Tool connects to the DXM2 board with a 4-Wire Connector as shown below:
2.0 Menu Structure
Menu Structure
System Configuration
Airflow Selection
Option Selection
Unit Configuration
Pump Configuration
Valve Configuration
Service Mode
Manual Operation
Control Diagnostics
Dipswitch Configuration
Fault History
Clear Fault History
3.0 System Configuration
Use the System Configuration
option on the start-up screen to adjust critical equipment settings.
The System Configuration information will be automatically obtained from each
communicating control in the system.
Note 1: The Airflow Selection menu (section 3.1) will not be present if the
connected communicating control system has no blower.
Note 2: The Pump Configuration menu (section 3.4) will not be present if the
connected communicating control is configured for No Loop Configuration
(OTHER).
Note 3: The Valve Configuration menu (section 3.5) will not be present if the
connected communicating control is configured for No Loop Configuration
(OTHER).
3.1 AIRFLOW SELECTION
Adjust the airflow settings for each system operating mode using the up/down arrow buttons. Press the center button to select each item.
- Airflow Settings (defaults stored in control) valid range: obtained from control (in 25 CFM increments)
- Blower Off Delay (default 60 seconds) valid range: 0 to 255 seconds (in 5 second increments)
NOTE 1: The Airflow Settings will only be present if the connected
communicating control is configured for ECM blower.
NOTE 2: If multiple units are connected to one thermostat, refer to section
3.6 for unit selection.
3.2 OPTION SELECTION
This option allows the configuration
of heat pump options to be modified.
Adjust the Option settings using the up/down arrow buttons. Press the center
button to select each item.
- Motorized Valve (defaults stored in control) valid range: Off, On “On” delays compressor start until the valve is fully open.
- Compressor ASCD (Anti-Short Cycle Delay (default stored in control) valid range: 5 to 8 (in 1 minute increments)
NOTE 1: The Compressor Anti-Short Cycle Delay setting provides equipment
protection by forcing the compressor to wait a few minutes before restarting.
NOTE 2: If multiple units are connected to one thermostat, refer to section
3.6 for unit selection.
NOTE: “Motorized Valve” used here refers to a two-position motorized water valve, not to be confused with the modulating motorized water valve found in the LOOP CONFIG.
3.3 UNIT CONFIGURATION
Adjust the Unit Configuration
settings including Heat Pump Family, Heat Pump Size, Blower Type, and Loop
Configuration using the up/down arrow buttons. Press the center button to
select each item.
- Heat Pump Family (default stored in control) valid range: TE, TY, TES, TEP, TRT, TSM, TSL
- Heat Pump Size (default stored in control) valid range: depends on Heat Pump Family setting
- Blower Type (default stored in control) valid range: NO BLOWER, 2-SPD PSC, COM ECM-V, 1-SPD PSC, 2-SPD CTM, PWM ECM, VFD
- Loop Config (default stored in control) valid range: Other, VS PUMP, MOD VALVE
Airflow, pump and valves can be configured from System Configuration’ screen. SelectVS PUMP PARALLEL’ when applying an internal variable speed flow
controller with other flow controllers on a single loop in parallel.
NOTE: Refer to section 3.6.3 for multi-unit configuration instructions.
3.4 PUMP CONFIGURATION
vFlow™ vs internal flow control pump can be controlled either through
temperature differential (Delta T) or can be set to specific speed (fixed; %
of full speed for each heat and cool stage).
Can be configured for either single pumping or parallel pumping.
Configure temperature differentials at the thermostat for vFlowTM units with
an internal flow control pump.
Adjust the Pump Configuration settings using the up/down arrow buttons. Press
the center button to select each item.
- Heating Delta T (default stored in control) valid range: 4 to 12ºF (in 1ºF increments)
- Cooling Delta T (default stored in control) valid range: 9 to 20ºF (in 1ºF increments)
Maximum Heat LWT (valid range based on specific model; refer to model IOM).
Minimum Cool LWT (valid range based on specific model; refer to model IOM).
NOTE: Refer to section 3.6.3 for multi-unit configuration instructions.
To control vs pump by fixed speed, select Pump Control’, press , use down arrow to selectFixed’, and press to save.
Default stored in control. Valid range: 15% – 90% (in 1% increments)
Heating Stage 1 Cooling Stage 1
Heating Stage 2 Cooling Stage 2
If Pump Configuration is set to `VS PUMP PARALLEL’, valid range changes to 50-90% (in 1% increments).
3.5 VALVE CONFIGURATION
Configure temperature differentials
at the thermostat for vFlow™ units with a motorized modulating valve.
Adjust the Valve Configuration settings using the up/down arrow buttons. Press
the center button to select each item.
- Heating Delta T (default stored in control) valid range: 4 to 12ºF (in 1ºF increments)
- Cooling Delta T (default stored in control) valid range: 9 to 20ºF (in 1ºF increments)
NOTE 1: Minimum and Maximum degree values are shown only when the control is configured with the appropriate values.
NOTE 2: Refer to section 3.6.3 for multi-unit configuration instructions.
3.5.1 MODULATING VALVE OFF POSITION
For certain commercial multi-unit applications, the modulating valve can be kept slightly open by choosing values 3.3-4.0.
3.6 MULTI-UNIT CONFIGURATION
If multiple units are
connected to one 7602-457 thermostat upon unit start-up, the thermostat will
automatically register the serial numbers of all units connected to it.
NOTE: Multiple units may be connected directly to the 7602457 thermostat or
connected to one another in series, as shown by the figure below.
3.6.1 MULTI-UNIT AIRFLOW SELECTION
In section 3.1, when an installer selects “Airflow Selection” from the System Configuration menu, the installer may choose the unit to configure by the last 4 digits of its serial number from the following screen.
3.6.2 MULTI-UNIT OPTION SELECTION
In section 3.2, when an installer selects “Option Selection” from the System Configuration menu, the installer may choose the unit to configure by the last 4 digits of its serial number from the following screen.
3.6.3 Multi-Unit, Unit, Pump, & Valve Configuration
To configure Unit, Pump, and Valve options in sections 3.33.5, the thermostat must be connected to only one unit at a time.
4.0 Service Mode
4.1 MANUAL OPERATION
Manual Operation mode allows service
personnel to manually command operation for any of the thermostat outputs,
blower speed, as well as pump speed or valve position to help troubleshoot
specific components.
NOTE 1: The ECM Airflow adjustment will not be present if the connected
communicating control (DXM2) is not configured for ECM (section 3.1).
NOTE 2: The Pump Speed adjustment will not be present if the connected
communicating control (DXM2) is not configured for Pump (section 3.4).
NOTE 3: The Valve Position adjustment will not be present if the connected
communicating control (DXM2) is configured for Valve (section 3.5).
4.2 CONTROL DIAGNOSTICS
Control Diagnostics mode allows
service personnel to view the status of all physical inputs, switches and
temperature sensor readings, as well as the operational status of the heat
pump at the thermostat.
Navigate between diagnostic screens using the left/right arrow buttons.
NOTE: The Pump Status will not be present if the connected communicating
control (DXM2) is not configured for Pump (section 3.4).
4.3 DIPSWITCH CONFIGURATION
Dipswitch Configuration mode
allows the service personnel to view the status of all dipswitch settings for
the connected communicating control (DXM2/AXM) at the thermostat.
Navigate between configuration screens using the left/right arrow buttons.
NOTE: The unit control dipswitch settings cannot be changed from the
thermostat or configuration/diagnostics tool.
4.4 FAULT HISTORY
Fault History
mode displays the five most recent stored fault codes for the connected
communicating control (DXM2).
Navigate between control fault codes using the up/down arrow buttons. Press
the center button to view more information about the highlighted fault code.
Fault Conditions Menu
4.4.1 Temperature Conditions
Displays detailed temperature
readings that were recorded at the time the fault occurred
4.4.2 Flow Conditions
Displays detailed blower and pump speed / valve position readings that were recorded at the time the fault occurred.
4.4.3 Input/Output Conditions
Displays the status of all physical and communicated inputs, switches, and control outputs that were recorded at the time the fault occurred.
4.4.4 Configuration Conditions
Displays the status of all dipswitch settings that were recorded at the time
the fault occurred.
4.4.5 Possible Causes
Displays possible causes as to why the
fault occurred
4.5 CLEAR FAULT HISTORY
Clear Fault History will clear all fault codes stored in the thermostat as well as the fault history in any connected communicating controls (DXM2/AXM).
Due to ongoing product improvements, specifications and dimensions are subject to change and correction without notice or incurring obligations. Determining the application and suitability for use of any product is the responsibility of the installer. Additionally, the installer is responsible for verifying dimensional data on the actual product prior to beginning any installation preparations.
Incentive and rebate programs have precise requirements as to product
performance and certification . All products meet applicable regulations in
effect on date of manufacture; however, certifications are not necessarily
granted for the life of a product. Therefore, it is the responsibility of the
applicant to determine whether a specific model qualifies for these
incentive/rebate programs.
1900 Wellworth Ave., Jackson, MI 49203 · Ph. 517-787-2100 · www.marsdelivers.com