Specifications

GT-PCS Split Units - 60Hz Puron
®
Created: 29 Aug., 2013
38
DXM2 Controls
 CAUTION! 
CAUTION! Do not restart units without inspection and
remedy of faulting condition. Equipment damage may occur.
Figure 29: Test Mode Button
(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.
DXM2 Controller
The DXM2 is capable of 2-way communications with
the Internal Flow Controller pump and the ACDU01A
Confi guration/Diagnostic tool.
For most residential applications, confi guration, monitoring
and diagnostics can all be done from the Confi guration/
Diagnostic tool so there’s no need to read LEDs and change
DIP switches.
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.
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 30) 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.
Table 12: Unit Operation
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