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R e s i d e n t i a l D i g i t a l P a c k a g e d U n i t s G T- P B S e r i e s - 6 0 H z P u ro n
®
R e v : 4 A p r i l , 1 4
36
DXM2 Controls
CAUTION!
CAUTION!
Do not restart units without inspection and
remedy of faulting condition. Equipment damage may occur.
(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
DXM2 Controller
DXM2 is the next generation in controls
and is capable of 2-way communication with smart
components, like the communicating thermostat, ECM fan
motor, Magna Variable-Speed Pump and con
fi
guration/
diagnostic tool.
For most residential applications, con
fi
guration, monitoring
and diagnostics can all be done from the thermostat/ service
tool so there’s no need to read LEDs and change DIP switches.
For details on user settings, refer to
ATC32U01A
Communicating Thermostat User Manual (part #
97B0055N06).
For details on Installer settings (not to be used by
consumers), refer to ATC32U01A
Communicating Thermostat
Installer manual (part # 97B0055N07).
For details on installer/service settings on the ACDU01A
con
fi
guration/diagnostic tool, refer to operation manual (part
# 97B0106N02).
For further details on the DXM2 control, refer to the DXM2
Application, Operation and Maintenance Manual (part #
97B0003N15). The DXM2 AOM is shipped with each unit.
Thermostat compatibility
It is strongly recommended that communicating thermostat
(ATC32U**) or con
fi
guration/ diagnostic tool (ACDU**) be
used with DXM2 control, to ensure easy con
fi
guration,
monitoring and diagnostics, in PLAIN English. For example,
Air
fl
ow CAN NOT be con
fi
gured without either the
communicating thermostat or con
fi
guration/ diagnostic tool
Field Hardware Confi guration Options
- Note: In the
following
fi
eld hardware con
fi
guration options, changes
should be made 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 or Variable-Speed
Pump (Internal water fl ow Models Only)
A0-2 jumper (Figure 32) Factory Set to “IOV” if using Internal
Modulating Motorized Valve or “PMW” if using Internal
Variable-Speed Pump. This applies only to units with Internal
Water Flow Control.
DIP Switches – There’s no need to change the DIP switches
settings on Residential units. All DIP switches in S1 and
S2 should be “on”. In S3, S3-1 should be “on” and the rest
should be “off”. For more details on DIP switches, refer to
the DXM2 AOM (part # 97B0003N15).
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.
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 push button, the DXM2 control enters a
20 minute test mode period in which all time delays are sped
up 15 times.
Figure 30: Test Mode Button
Table 10: Unit Operation