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
38
W A T E R - S O U R C E H E A T P U M P S
JE-Series
I s s u e D a t e :
M a y 1 0 , 2 0 2 1
DXM2 Controls, Cont’d.
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].
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 4a
for description and 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 (default). 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 Package #3 (S3)
Table 4a: Accessory DIP Switch Settings
�
CAUTION!
�
CAUTION!
Do not restart units without inspection and remedy
of faulting condition. Equipment damage may occur.
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
–
DIP Package #3 has 4 switches and provides the
following setup and operating selections:
3.1 –
Communications configuration: DIP 3.1 provides
selection of the DXM2 operation in a communicating
system. The DXM2 may operate as the Master of certain
network configurations. In most configurations the DXM2
will operate as a master device.
On = Communicating Master device (default). Off =
communicating
Subordinate
device.
3.2 –
HWG Test Mode: DIP 3.2 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).
3.3 –
HWG Temperature: DIP 3.3 provides the selection
of the HWG operating setpoint.
On = 150°F [66°C]. Off = 125°F [52°C] (default).
3.4 –
HWG Status: DIP 3.4 provides HWG operation
control.
On = HWG mode enabled. Off = HWG mode disabled
(default).
