HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS
R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A
R e v. : 0 3 A u g u s t , 2 0 1 2
Heat Controller, Inc. Water-Source Heating and Cooling Systems
36
General
To properly con
fi
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 Con
fi
guration
All factory installed DXM2 controls have their basic
con
fi
guration parameters set as part of the factory
manufacturing and test process. The System Con
fi
guration
option under the communicating thermostat Installer menu
provides the installer with the ability to adjust ECM target
air
fl
ows for each operating mode, set control options, setup
the loop con
fi
guration and parameters, and con
fi
gure
fi
eld
replacement controls.
Air
fl
ow Selection – The Air
fl
ow Selection menu allows the
installer to adjust the ECM target air
fl
ow for each control
operating mode, as well as independently set the heating and
cooling blower off delays.
ECM Air
fl
ows – Independent air
fl
ow selections may be made
for each stage of heating operation, each stage of cooling
operation with and without dehumidi
fi
cation, as well as
constant fan operation. The DXM2 control has set minimum
and maximum air
fl
ow limits for each operating mode, based
on the unit con
fi
guration that may not be changed.
Non-ECM Con
fi
guration – If the DXM2 is not con
fi
gured
to control an ECM blower, the air
fl
ow selections will not be
available on the Air
fl
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 con
fi
gured as a water-to-
water unit with anti–freeze in the load side loop. For ALL
other unit con
fi
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 con
fi
gurations, the Motorized Valve option
should be set to OFF.
Unit Con
fi
guration – Selections under the Unit Con
fi
guration
menu are normally set at the factory as a normal part of
the manufacturing and test process. This menu allows the
con
fi
guration to be modi
fi
ed for special applications, or to
con
fi
gure
fi
eld replacement controls. The Unit Con
fi
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 con
fi
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 con
fi
gurations.
Loop Con
fi
guration – When replacing a control in the
fi
eld, the Loop Con
fi
guration value must be set for proper
operation. The valid Loop Con
fi
guration values will be
available for the user to scroll through to select the
appropriate value from VS PUMP, MOD VALVE, or OTHER.
Loop Con
fi
guration – The Loop Con
fi
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 con
fi
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 Con
fi
guration Information
