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
26
DXM2 Control
DXM2 is the next generation in controls is capable of 2-way
communication between itself and smart components, like
the communicating thermostat, fan motor and con
fi
guration/
diagnostic tool.
For most residential applications, con
fi
guration, monitoring
and diagnostics can be done from the thermostat / service
tool and there’s no need to read LEDs and change DIP
switches.
For details on user settings, refer to User Manual (part #:
For details on Installer settings (not to be used by
consumers), refer to Installer manual (part #:
For details on installer/service settings on the con
fi
guration/
diagnostic tool, refer to operation manual (part #:
For further details on the DXM2 control, refer to the DXM2
Application, Operation and Maintenace Manual and it is
shipped with the unit)
Thermostat compatibility
It is
strongly recommended
that GeoMax2 communicating
thermostat be used with DXM2 control, to ensure easy
con
fi
guration, monitoring and diagnostics, in PLAIN
English, on the thermostat. For example, Air
fl
ow can NOT
be con
fi
gured without a communicating thermostat or
Con
fi
guration/ Diagnostic tool for use with GeoMax2.
Field Con
fi
guration Options
- Note: In the following
fi
eld
con
fi
guration options, jumper wires should be clipped ONLY
when power is removed from the DXM2 control.
Water coil low temperature limit setting:
Jumper 3 (JW3-
LT1 Low Temp) provides
fi
eld selection of temperature limit
setting for LT1 of 30°F or 10°F [-1°F or -12°C] (refrigerant
temperature).
Not Clipped = 30°F [-1°C]. Clipped = 10°F [-12°C].
A0-2: Con
fi
gure Modulating Valve (
fi
eld installed acces-
sory)
Set A0-2 jumper to “IOV” if using Modulating Motorized Valve
as
fi
eld installed accessory
DIP Switches
- For residential applications, all con
fi
guration
can be performed in PLAIN ENGLISH on the thermostat.
No DIP switch changes are required and no LEDs to be
observed.
DXM2 Controls
CAUTION!
CAUTION!
Do not restart units without inspection and
remedy of faulting condition. Equipment damage may
occur.
Figure 26: Test Mode Button
Table 8: Unit Operation
DXM2 Control Start-up Operation
The control will not operate until all inputs and safety controls
are checked for normal conditions. The compressor will
have a 5 minute anti-short cycle delay at power-up. The
fi
rst
time after power-up that there is a call for compressor, the
compressor will follow a 5 to 80 second random start delay.
After the random start delay and anti-short cycle delay,
the compressor relay will be energized. On all subsequent
compressor calls, the random start delay is omitted.
(240Vac)
Com
N.O.
Fan Enable
Test
P5
B-
Gnd
P4
A+ 24V
(240Vac)
Fan Speed
N.O.
N.C.
12V
OUT
Gnd
P8
IN
NC
P12
Pust test button to
enter Test Mode and
speed-up timing and
delays for 20 minutes.
Conventional
T-stat signal
(Non-Communicating)
Unit
ECM fan
G
Fan only
G, Y1
Stage 1 heating
1
G, Y1, Y2
Stage 2 heating
1
G, Y1, Y2, W
Stage 3 heating
1
G, W
Emergency heat
G, Y1, O
Stage 1 cooling
2
G, Y1, Y2, O
Stage 2 cooling
2
1 Stage 1 = 1st stage compressor, 1st stage fan operation
Stage 2 = 2nd stage compressor, 2nd stage fan operation
Stage 3 = 2nd stage compressor, auxiliary electric heat, 3rd
stage fan operation
2 Stage 1 = 1st stage compressor, 1st stage fan operation,
reversing
valve
Stage 2 = 2nd stage compressor, 2nd stage fan operation,
reversing
valve
Test Mode button:
Test mode allows the service technician to check the
operation of the control in a timely manner. By momentarily
pressing the TEST pushbutton, the DXM2 control enters a 20
minute test mode period in which all time delays are sped up
15 times.