R e s i d e n t i a l H & V - 6 0 H z H F C - 4 1 0 A :
R e v : O c t o b e r 5 , 2 0 2 1
34
G e o t h e r m a l H e a t i n g a n d Co o l i n g
CXM Control
For detailed control information, see CXM Application,
Operation and Maintenance (AOM) manual (part
#97B0003N12).
Field Selectable Inputs
Test mode:
Test mode allows the service technician to check
the operation of the control in a timely manner. By momentarily
shorting the test terminals, 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 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-FP1
Low Temp) provides field selection of temperature
limit setting for FP1 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-FP2
Low Temp) provides field selection of temperature limit
setting for FP2 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: Unit Performance Sentinel Disable - provides
field selection to disable the UPS feature.
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.
CXM Controls
Short test pins
together to enter Test
Mode and speed-up
timing and delays for
20 minutes.
Figure 27: Test Mode Pins
LT1
LT2
LT1
LT1
LT2
LT2
Table 6a: CXM LED And Alarm Relay Operations
Description of Operation
LED
Alarm Relay
Normal Mode
On
Open
Normal Mode with UPS Warning
On
Cycle (closed 5 sec., Open 25 sec.)
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
- 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
