Carrier | CXM Controls |
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CXM Control
For detailed control information, see CXM/DXM Application, Operation and Maintenance (AOM) manual (part #97B0003N08).
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
Not Clipped = 30°F
Not Clipped = 30°F
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 LED And Alarm Relay Operations
Description of Operation | LED | Alarm Relay |
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Normal Mode | On | Open |
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Normal Mode with UPS Warning | On | Cycle (closed 5 sec., Open 25 sec.) |
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CXM is | Off | Open |
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Fault Retry | Slow Flash | Open |
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Lockout | Fast Flash | Closed |
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Over/Under Voltage Shutdown | Slow Flash | Open (Closed after 15 minutes) |
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Test Mode - No fault in memory | Flashing Code 1 | Cycling Code 1 |
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Test Mode - HP Fault in memory | Flashing Code 2 | Cycling Code 2 |
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Test Mode - LP Fault in memory | Flashing Code 3 | Cycling Code 3 |
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Test Mode - FP1 Fault in memory | Flashing Code 4 | Cycling Code 4 |
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Test Mode - FP2 Fault in memory | Flashing Code 5 | Cycling Code 5 |
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Test Mode - CO Fault in memory | Flashing Code 6 | Cycling Code 6 |
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Test Mode - Over/Under | Flashing Code 7 | Cycling Code 7 |
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shutdown in memory |
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Test Mode - UPS in memory | Flashing Code 8 | Cycling Code 8 |
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Test Mode - Swapped Thermistor | Flashing Code 9 | Cycling Code 9 |
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40
Carrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/05
