55
Tranquility
®
D i g i t a l ( D X M 2 ) — Tr o u b l e s h o o t i n g G u i d e
R e v. : 1 0 M a r c h , 2 0 1 5
w w w. c l i m a t e m a s t e r. c o m
DXM2 Controls
FIELD SELECTABLE INPUTS
Test mode:
Test mode allows the service technician to check
the operation of the control in a timely manner. By
momen-
tarily pressing the TEST pushbutton, the DXM2 control
enters a 20 minute test mode period in which all time delays
are sped up 15 times. Upon entering test mode, the Status
and Fault LED displays will change. The Status LED will ei-
ther flash rapidly to indicate the control is in the test mode, or
display a numeric flash code representing the current airflow
if an ECM blower is connected and operating. The Fault LED
will display the most recent fault condition in memory. Note:
A flash code of 1 indicates there have been no faults stored
in memory.
For diagnostic ease at conventional thermostats, the alarm
relay will also cycle during test mode. The alarm relay will
cycle on and off similar to the Fault LED to indicate a code
representing the last fault, at the thermostat.
The test mode can be exited by pressing the TEST pushbut-
ton for 3 seconds. The test Mode can also be entered and
exited by cycling the G input, 3 times within a 60 second time
period.
During Test Mode, the control monitors to see if the LT1 and
LT2 thermistors are connected and operating properly. If the
control is in Test Mode, the control will lockout, with Code 9,
after 60 seconds if:
a) the compressor is On in Cooling Mode and the LT1 sen-
sor is colder than the LT2 sensor. or,
b) the compressor is On in Heating Mode and the LT2 sen-
sor is colder than the LT1 sensor.
Retry Mode: If the control is attempting a retry of a fault, the
Fault LED will slow flash (slow flash = one flash every 2 sec-
onds) to indicate the control is in the process of retrying.
Field Configuration Options - Note: In the following field
configuration options, jumper wires should be clipped ONLY
when power is removed from the DXM2 control.
Note: Jumper 3 must not be clipped prior to adding
antifreeze to the water loop. Antifreeze protection to 10°F
required. Clipping JW3 without antifreeze may result in
freeze damage and will void the unit warranty.
Water coil low temperature limit setting:
Jumper 3 (JW3-
LT1 Low Temp) provides field selection of temperature limit
setting for LT1 of 30°F or 10°F [-1°F or -12°C] (refrigerant
temperature).
Not Clipped = 30°F. Clipped = 10°F.
Alarm Relay Setting - Jumper 1 (JW1-AL2 Dry) provides
field selection of alarm function when Alarm Relay is ener-
gized.
Not Clipped = AL1 connected to R (24VAC) with Alarm Relay
active.
Clipped = Dry contact connection between AL1 and AL2 with
Alarm Relay active.
JUMPERS (S
et at Factory)
A0-2: Configure Modulating Valve or Variable-Speed
Pump (vFlow™ Models Only)
Set A0-2 jumper (see Figure on page 5) to “0 - 10v” if using
Internal Modulating Motorized Valve or “PWM” if using Inter-
nal Variable-Speed Pump. This applies only to vFlow™ units
with Internal Speed Water Flow Control.
DIP SWITCHES
Note: In the following field configuration options, DIP
switches should only be moved when power is removed
from the DXM2 Control to ensure proper operation.
DIP Package #1 (S1)
DIP Package #1 is 8 position and provides the following
setup selections.
DIP 1.1:
Unit Performance Sentinel Disable - Provides field
selection to disable the UPS feature.
On = Enabled. Off = Disabled.
DIP 1.2:
Compressor Relay Staging Operation - Provides
selection of Compressor Relay staging operation. The
Compressor Relay can be selected to turn on with Stage 1
or Stage 2 call from the thermostat. This is used with Dual
Stage units (2 compressors where 2 DXM2 Controls are
being used) or with master/slave applications. In master/slave
applications, each compressor and fan will stage according to
its appropriate DIP 1.2. If set to stage 2, the compressor will
have a 3 second on-delay before energizing during a Stage
2 demand. Also, if set for stage 2, the Alarm Relay will NOT
cycle during Test Mode.
On = Stage 1. Off = Stage 2.
DIP 1.3:
Thermostat Type (Heat/Cool) - Provides selection
of thermostat type. Heat Pump or Heat/Cool thermostats
can be selected. When in Heat/Cool Mode, Y1 is input call
for Cooling Stage 1, Y2 is input call for Cooling Stage 2,
W1 is input call for Heating Stage 1, and O/W2 is input call
for Heating Stage 2. In Heat Pump Mode, Y1 is input call
for Compressor Stage 1, Y2 is input call for Compressor
Stage 2, W1 is input call for Heating Stage 3 or Emergency
Heat, and O/W2 is the input call for RV (heating or cooling
dependent upon DIP 1.4).
On = Heat Pump. Off = Heat/Cool.
DIP 1.4:
Thermostat Type (O/B) - Provides selection of
thermostat type. Heat pump thermostats with “O” output on
with Cooling or “B” output on with Heating can be selected.
On = HP Stat with O output with cooling. Off = HP Stat with B
output with heating.
DIP 1.5:
Dehumidification Mode - Provides selection of
normal or Dehumidification Fan Mode. In Dehumidification
Mode, the fan speed will be adjusted for Cooling. In Normal
Mode, the fan speed will be normal during Cooling.
