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
56
G e o t h e r m a l H e a t i n g a n d C o o l i n g
Table 2: Accessory Relay 2 Configuration
Table 1: Accessory Relay 1 Configuration
DXM2 Controls
On = Normal Fan Mode. Off = Dehumidification Mode.
DIP 1.6
: DDC Output at EH2 - DIP Switch 1.6 provides
selection for DDC operation. If set to DDC Output at EH2, the
EH2 terminal will continuously output the last fault code of the
controller. If set to EH2 normal, then the EH2 will operate as
standard electric heat output.
On = EH2 Normal. Off = DDC Output at EH2.
DIP 1.7:
Boilerless Operation - Provides selection
of Boilerless Operation. In Boilerless Mode, only the
compressor is used for Heating Mode when LT1 is above
the temperature specified by the setting of DIP 1.8. If DIP
1.8 is set for 50°F, then the compressor is used for heating
as long as LT1 is above 50°F. Below 50°F, the compressor is
not used and the control goes into Emergency Heat Mode,
staging on EH1 and EH2 to provide heating.
On = normal. Off = Boilerless operation.
DIP 1.8:
Boilerless Changeover Temperature - Provides
selection of boilerless changeover temperature setpoint.
On = 50°F. Off = 40°F.
DIP Package #2 (S2)
DIP Package #2 is 8 position and provides the following
setup selections.
DIP Package #2 (S2) - A combination of dip switches 2.1,
2.2, 2.3, and 2.4, 2.5, 2.6 deliver configuration of ACC1 and
ACC2 relay options respectively. See Table 7a for description
and functionality.
DIP 2.7:
Auto Dehumidification Fan Mode or High Fan Mode
- Provides selection of Auto Dehumidification Fan Mode or
High Fan Mode. In Auto Dehumidification Mode, the Fan
Speed will be adjusted during Cooling IF the H input is active.
In High Fan Mode, the Fan will operate on high speed when
the H input is active.
On = Auto Dehumidification Mode (default). Off = High Fan
Mode.
DIP 2.8:
Factory Setting - Normal position is On. Do not
change selection unless instructed to do so by the Factory.
DIP Package #3 (S3)
DIP Package #3 is 4 position and provides the following
setup selections.
DIP 3.1:
Communications configuration: Provides selection
of the DXM2 operation in a communicating system. The
DXM2 may operate as a communicating master or slave
device depending on the network configuration. In most
configurations, the DXM2 will operate as a master device.
On = Communicating Master device (default). Off =
communicating Slave device.
DIP 3.2:
HWG Test Mode: Provides forced operation of the
HWG pump output, activating the HWG pump output for up to
five minutes.
On = HWG test mode. Off = Normal HWG mode (default).
DIP 3.3:
HWG Temperature: Provides the selection of the
HWG operating setpoint.
On = 150°F [66°C]. Off = 125°F [52°C] (default).
DIP 3.4:
HWG Status: Provides HWG operation control.
On = HWG mode enabled. Off = HWG mode disabled
(default).
SAFETY FEATURES
The following safety features are provided to protect the
compressor, heat exchangers, wiring and other components
from damage caused by operation outside of design
conditions.
Anti-Short Cycle Protection - The control features a 5
minute anti-short cycle protection for the compressor.
Note: The 5 minute anti-short cycle also occurs at power
up.
Random Start
- The control features a 5-80 second random
DIP 2.1
DIP 2.2 DIP 2.3
ACC1 Relay Option
ON
ON
ON
Cycle with fan
OFF
ON
ON
Digital night setback
ON
OFF
ON
Water valve – Slow opening
ON
ON
OFF
Outside air damper
OFF
ON
OFF
Dedicated Dehumidification Mode
option – Dehumidistat
OFF
OFF
OFF
Dedicated Dehumidification Mode
option – Humidistat
OFF
OFF
ON
Hydronic Economizer – 1st Stage
ON
OFF
OFF
Hydronic Economizer – Both
Stages
All other DIP combinations are invalid
DIP 2.4
DIP 2.5 DIP 2.6
ACC2 Relay Option
ON
ON
ON
Cycle with compressor
OFF
ON
ON
Digital night setback
ON
OFF
ON
Water valve – Slow opening
OFF
OFF
ON
Humidifier
ON
ON
OFF
Outside air damper
All other DIP combinations are invalid
