Comfort-Aire HTS Series Split System,Two Stage, 2-5 Tons - Manual (Page 26)

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Installation, Operation & Maintenance HTS SERIES SPLIT SYSTEM Heat Controller, LLC
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 confi guration/
diagnostic tool.
For most residential applications, confi 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 confi 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
confi guration, monitoring and diagnostics, in PLAIN
English, on the thermostat. For example, Airfl ow can NOT
be confi gured without a communicating thermostat or
Confi guration/ Diagnostic tool for use with GeoMax2.
Field Confi guration Options - Note: In the following fi eld
confi 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: Confi 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 confi 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.