Cxm Controls - Carrier 50YDV Installation, Operation And Maintenance Instructions

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 fl ash 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 fl ash (slow fl ash = one fl ash every 2
seconds) to indicate the control is in the process of retrying.
Field Confi guration Options
Note: In the following fi eld confi guration 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 fi eld 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 fi eld 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 fi eld
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 fi eld confi guration options, DIP
switches should only be changed when power is removed
from the CXM control.
DIP switch 1: Unit Performance Sentinel Disable - provides
fi eld 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
R e s i d e n t i a l P a c k a g e d U n i t s - 6 0 H z P u r o n
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 6a: CXM LED And Alarm Relay Operations
Description of Operation
Normal Mode
Normal Mode with UPS Warning
CXM is non-functional
Fault Retry
Lockout
Over/Under Voltage Shutdown
Test Mode - No fault in memory
Test Mode - HP Fault in memory Flashing Code 2
Test Mode - LP Fault in memory Flashing Code 3
Test Mode - FP1 Fault in memory Flashing Code 4
Test Mode - FP2 Fault in memory Flashing Code 5
Test Mode - CO Fault in memory Flashing Code 6
Test Mode - Over/Under
shutdown in memory
Test Mode - UPS in memory
-Slow Flash = 1 fl ash every 2 seconds
Test Mode - Swapped Thermistor Flashing Code 9
-Fast Flash = 2 fl ashes every 1 second
-Flash code 2 = 2 quick fl ashes, 10 second pause, 2 quick
fl ashes, 10 second pause, etc.
-On pulse 1/3 second; off pulse 1/3 second
Figure 27: Test Mode Pins
R e v. : 4 J a n . , 2 0 1 2

CXM Controls

LED Alarm Relay
On Open
On Cycle (closed 5 sec., Open 25 sec.)
Off Open
Slow Flash Open
Fast Flash Closed
Slow Flash Open (Closed after 15 minutes)
Flashing Code 1 Cycling Code 1
Cycling Code 2
Cycling Code 3
Cycling Code 4
Cycling Code 5
Cycling Code 6
Flashing Code 7 Cycling Code 7
Flashing Code 8 Cycling Code 8
Cycling Code 9
Short test pins
together to enter Test
Mode and speed-up
timing and delays for
20 minutes.
®
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