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
25
CXM Controls
CXM Control -
For detailed control information, see CXM
Application, Operation and Maintenance (AOM) manual.
Field Selectable Inputs -
Test mode: Test mode allows
the service technician to check the operation of the control
in a timely manner. At board, momentarily shorting the
test terminals or externally, momentarily push test button
(See Fig 22), the CXM control enters a 20 minute test
mode period in which all time delays are sped up 15
times. Upon entering test mode, the status LED will flash
a code representing the last fault. For diagnostic ease at
the thermostat, the alarm relay will also cycle during test
mode. The alarm relay will cycle on and off similar to the
status LED to indicate a code representing the last fault, at
the thermostat. Test mode can be exited by shorting the
test terminals or holding button for 3 seconds.
Retry Mode:
If the control is attempting a retry of a fault,
the status LED will slow flash (slow flash = one flash every 2
seconds) 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 CXM control.
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 [-1°C]. Clipped = 10°F [-12°C].
Air coil low temperature limit setting:
Jumper 2 (JW2-LT2
Low Temp) provides field selection of temperature limit
setting for LT2 of 30°F or 10°F [-1°F or -12°C] (refrigerant
temperature).
Note: This jumper should only be clipped
under extenuating circumstances, as recommended by
the factory.
Not Clipped = 30°F [-1°C]. Clipped = 10°F [-12°C].
Alarm relay setting:
Jumper 1 (JW1-AL2 Dry) provides field
selection of the alarm relay terminal AL2 to be jumpered to
24VAC or to be a dry contact (no connection).
Not Clipped = AL2 connected to R. Clipped = AL2 dry
contact (no connection).
DIP Switches -
Note: In the following field configuration
options, DIP switches should only be changed when
power is removed from the CXM control.
DIP switch 1: Not Applicable..
On = Enabled. Off = Disabled.
DIP switch 2: Stage 2 Selection - provides selection of
whether compressor has an “on” delay. If set to stage
2, the compressor will have a 3 second delay before
energizing. Also, if set for stage 2, the alarm relay will NOT
cycle during test mode.
On = Stage 1. Off = Stage 2
DIP switch 3: Not Used.
DIP switch 4: DDC Output at EH2 - 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.
Note: Some CXM controls only have a 2 position DIP
switch package. If this is the case, this option can be
selected by clipping the jumper which is in position 4 of
SW1.
Jumper not clipped = EH2 Normal. Jumper clipped = DDC
Output at EH2.
DIP switch 5: Factory Setting - Normal position is “On.”
Do not change selection unless instructed to do so by the
factory.
Table 7a: LED And Alarm Relay Operations
- Slow Flash = 1 flash every 2 seconds
- Fast Flash = 2 flashes every 1 second
- Flash code 2 = 2 quick flashes, 10 second pause, 2 quick
flashes, 10 second pause, etc.
- On pulse 1/3 second; off pulse 1/3 second
Description of Operation
LED
Alarm
Normal Mode
ON
Open
Normal Mode w/UPS Warning
ON
Cycle (Closed 5 seconds,
Open 25 seconds)
CXM is non-functional
OFF
Open
Fault Retry
Slow Flash
Open
Lockout
Fast Flash
Closed
Over/Under Voltage Shutdown
Slow Flash
Open (Closed after 15
Minutes)
Test Mode - No Fault in Memory
Flashing Code 1
Cycling Code 1
Test Mode - HP Fault in Memory
Flashing Code 2
Cycling Code 2
Test Mode - LP Fault in Memory
Flashing Code 3
Cycling Code 3
Test Mode - LT1 Fault in Memory
Flashing Code 4
Cycling Code 4
Test Mode - LT2 Fault in Memory
Flashing Code 5
Cycling Code 5
Test Mode - CO Fault in Memory
Flashing Code 6
Cycling Code 6
Test Mode - Over/Under
Shutdown in Memory
Flashing Code 7
Cycling Code 7
Test Mode - UPS in Memory
Flashing Code 8
Cycling Code 8
Test Mode - Swapped Thermistor
Flashing Code 9
Cycling Code 9
