Dxm2 Controls - Carrier 50YFV Installation, Operation And Maintenance Instructions

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 r o n
R e v : 4 A p r i l , 1 4

DXM2 Controls

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 confi guration/
diagnostic tool.
For most residential applications, confi 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
confi 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 confi guration/ diagnostic tool (ACDU**) be
used with DXM2 control, to ensure easy confi guration,
monitoring and diagnostics, in PLAIN English. For example,
Airfl ow CAN NOT be confi gured without either the
communicating thermostat or confi guration/ diagnostic tool
Field Hardware Confi guration Options - Note: In the
following fi eld hardware confi 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.
CAUTION! Do not restart units without inspection and
remedy of faulting condition. Equipment damage may occur.
36
CAUTION!
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
P4
Gnd B- A+ 24V
(240Vac)
P5
Com
Fan Enable
Pust test button to
enter Test Mode and
speed-up timing and
delays for 20 minutes.
Table 10: Unit Operation
Conventional
T-stat signal
(Non-Communicating)
G
G, Y1
G, Y1, Y2
G, Y1, Y2, W
G, W
G, Y1, O
G, Y1, Y2, O
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
®
(240Vac)
N.C.
N.O.
N.O.
Fan Speed
P8
12V
Test
P12
IN
OUT
Gnd
NC
Unit
ECM fan
Fan only
1
Stage 1 heating
1
Stage 2 heating
1
Stage 3 heating
Emergency heat
2
Stage 1 cooling
2
Stage 2 cooling