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HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS
Residential Split - 60Hz R410A
Rev.: 03 August, 2012
Heat Controller, Inc. Water-Source Heating and Cooling Systems36
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.
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 (HTS,HE, etc.) 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.
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 delt T limits that may not be changed.
Advanced Troubleshooting and Confi guration Information