JRC-Series
R e v. : D e c e m b e r 8 , 2 0 2 1
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
27
DXM Controls, Cont’d.
DIP Package #2 (S2)
- DIP Package #2 has 8 switches
and provides the following setup selections:
2.1
- Accessory1 relay personality: DIP 2.1 provides
selection of ACC1 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.2
- Accessory1 relay personality: DIP 2.2 provides
selection of ACC 1 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.3
- Accessory1 relay personality: DIP 2.3 provides
selection of ACC 1 relay options. See table 5c for
description of functionality.
2.4
- Accessory2 relay personality: DIP 2.4 provides
selection of ACC 2 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.5
- Accessory2 relay personality: DIP 2.5 provides
selection of ACC 2 relay personality (relay operation/
characteristics). See table 5c for description of
functionality.
2.6
- Accessory2 relay personality: DIP 2.6 provides
selection of ACC 2 relay options. See table 5c for
description of functionality.
2.7
- Auto dehumidification fan mode or high fan mode:
DIP 2.7 provides selection of auto dehumidification fan
mode or high fan mode. In auto dehumidification mode,
the fan speed relay will remain off during cooling stage 2
IF the H input is active. In high fan mode, the fan enable
and fan speed relays will turn on when the H input is
active.
On = Auto dehumidification mode. Off = High fan mode.
2.8
- Special factory selection: DIP 2.8 provides special
factory selection. Normal position is “On”. Do not change
selection unless instructed to do so by the factory.
DIP 2.1
DIP 2.2
DIP 2.3
ACC1 Relay Option
On
On
On
Cycle with fan
Off
On
On
Digital NSB
On
Off
On
Water Valve - slow opening
On
On
Off
OAD
Off
Off
Off
Reheat Option - Humidistat
Off
On
Off
Reheat Option - Dehumidistat
DIP 2.4
DIP 2.5
DIP 2.6
ACC2 Relay Option
On
On
On
Cycle with compressor
Off
On
On
Digital NSB
On
Off
On
Water Valve - slow opening
On
On
Off
OAD
All other DIP combinations are invalid
Table 7c: Accessory DIP Switch Settings
1.3
- Thermostat type (heat pump or heat/cool): DIP 1.3
provides selection of thermostat type. Heat pump or
heat/cool thermostats can be selected. When in heat/
cool mode, Y1 is the input call for cooling stage 1; Y2 is
the input call for cooling stage 2; W1 is the input call for
heating stage 1; and O/W2 is the input call for heating
stage 2. In heat pump mode, Y1 is the input call for
compressor stage 1; Y2 is the input call for compressor
stage 2; W1 is the input call for heating stage 3 or
emergency heat; and O/W2 is the input call for reversing
valve (heating or cooling, depending upon DIP 1.4).
On = Heat Pump. Off = Heat/Cool.
1.4
- Thermostat type (O/B): DIP 1.4 provides selection of
thermostat type for reversing valve activation. Heat pump
thermostats with “O” output (reversing valve energized
for cooling) or “B” output (reversing valve energized for
heating) can be selected with DIP 1.4.
On = HP stat with “O” output for cooling. Off = HP stat
with “B” output for heating.
1.5
- Dehumidification mode: DIP 1.5 provides selection of
normal or dehumidification fan mode. In dehumidification
mode, the fan speed relay will remain off during cooling
stage 2. In normal mode, the fan speed relay will turn on
during cooling stage 2.
On = Normal fan mode. Off = Dehumidification mode.
1.6
- DDC output at EH2: DIP 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,” EH2 will operate as
standard electric heat output.
On = EH2 Normal. Off = DDC Output at EH2.
1.7
- Boilerless operation: DIP 1.7 provides selection of
boilerless operation. In boilerless mode, the compressor is
only used for heating when LT1 is above the temperature
specified by the setting of DIP 1.8. Below DIP 1.8 setting,
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.
1.8
- Boilerless changeover temperature: DIP 1.8 provides
selection of boilerless changeover temperature setpoint.
Note that the LT1 thermistor is sensing refrigerant
temperature between the coaxial heat exchanger and
the expansion device (TXV). Therefore, the 50°F [10°C]
setting is not 50°F [10°C] water, but approximately 60°F
[16°C] EWT.
On = 50°F [10°C]. Off = 40°F [16°C].
