Advanced Troubleshooting And Confi Guration Information - Heat Controller DXM2 Application And Instruction Manual

Heat Controller, Inc.
Advanced Troubleshooting and Confi guration Information
General
To properly confi gure and troubleshoot advanced control
features, and to aid in troubleshooting basic control
features, a communicating thermostat or diagnostic tool
with similar capabilities should be used.
System Confi guration
All factory installed DXM2 controls have their basic
confi guration parameters set as part of the factory
manufacturing and test process. The System Confi guration
option under the communicating thermostat Installer menu
provides the installer with the ability to adjust ECM target
airfl ows for each operating mode, set control options, setup
the loop confi guration and parameters, and confi gure fi eld
replacement controls.
Airfl ow Selection – The Airfl ow Selection menu allows the
installer to adjust the ECM target airfl ow for each control
operating mode, as well as independently set the heating
and cooling blower off delays.
ECM Airfl ows – Independent airfl ow selections may be
made for each stage of heating operation, each stage of
cooling operation with and without dehumidifi cation, as
well as constant fan operation. The DXM2 control has set
minimum and maximum airfl ow limits for each operating
mode, based on the unit confi guration that may not be
changed.
Non-ECM Confi guration – If the DXM2 is not confi gured to
control an ECM blower, the airfl ow selections will not be
available on the Airfl ow Selection menu.
Heating / Cooling Off Delays – The heating and cooling
mode blower off delay times may be independently
adjusted by the user. Each delay time may be set between
0 and 255 seconds.
Option Selection – The Option Selection menu allows the
installer to set selected control options.
LT2 Setpoint – The LT2 setpoint should be set to ANTI-
FREEZE ONLY when the unit is confi gured as a water-to-
water unit with anti–freeze in the load side loop. For ALL
other unit confi gurations, the LT2 setpoint should be set to
WATER.
Motorized Valve – The Motorized Valve option should be
set to ON when a motorized water valve with end switch
wired to the DXM2 Y1 is used with a communicating
thermostat. For all other system confi gurations, the
Motorized Valve option should be set to OFF.
DXM2 UNIT CONTROLS
Unit Confi guration – Selections under the Unit
Confi guration menu are normally set at the factory as a
normal part of the manufacturing and test process. This
menu allows the confi guration to be modifi ed for special
applications, or to confi gure fi eld replacement controls.
The Unit Confi guration menu provides the ability to select
the Heat Pump Family, Unit Size, Blower Type, and Loop
Type. The Heat Pump Family, Unit Size, and Blower
Type are needed to properly operate any particular unit
confi guration, especially those with ECM blowers.
Heat Pump Family – When replacing a control in the fi eld,
the Heat Pump Family value must be set for proper blower
and loop operation. The valid family values (HEV/H and
other Communicating units) are available for the user to
scroll through to select the proper value.
Heat Pump Size – When replacing a control in the fi eld,
the Heat Pump Size value must be set for proper blower
operation. After a Heat Pump Family has been selected,
the valid Heat Pump Size values will be available for the
user to scroll through to select the proper value.
Blower Type – When replacing a control in the fi eld, the
Blower Type value must be set for proper operation. The
valid Blower Type values will be available for the user
to scroll through to select the appropriate value from No
Blower, ECM Blower, or PSC confi gurations.
Loop Confi guration – When replacing a control in the
fi eld, the Loop Confi guration value must be set for
proper operation. The valid Loop Confi guration values
will be available for the user to scroll through to select
the appropriate value from VS PUMP, MOD VALVE, or
OTHER.
Loop Confi guration – The Loop Confi guration menu allows
the installer to set the operating parameters for either
an internal fl ow center, or a proportional water valve,
depending on the unit confi guration.
Heating Delta T – The Heating Delta T option allows the
target delta T (EWT – LWT) value selection for operating
in the heating mode. The DXM2 control has set minimum
and maximum delta T limits that may not be changed.
Cooling Delta T – The Cooling Delta T option allows the
target delta T (LWT – EWT) value selection for operating in
the cooling mode. The DXM2 control has set minimum and
maximum delta T limits that may not be changed.
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Application, Operation, & Maintenance Manual