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Features
• Anti-short cycle protection
• High and Low pressure cutouts
• Water Coil freeze protection
• Air Coil freeze protection
• Random Start
• Unit Performance Sentinel
• Over/Under Voltage protection
• Diagnostic LED
• Reset Lockout at unit or disconnect
• Intelligent Reset
• Condensate Overflow sensor
• Test Mode
• Electric Heat Outputs
• Accessory Water Valve Connection
• Optional LonWorks Control (see pg 8)
Field Selectable Inputs
Test Mode
-
Test Mode allows the service personnel 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.
Note: Code 1 indicates there is no fault in memory;
stated differently, the control has not faulted since the
last power down.
CXM CONTROL DESCRIPTION
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 process of
retrying.
NOTE: In the following field configuration options,
jumper wires should be clipped ONLY when power is
removed from the CXM control.
Water Coil Freeze Protection Limit Setting
- Jumper 2
(JW2-F12 Low Temp) provides field selection of
temperature limit setting for FP1 to be 30
°
F or 10
°
F.
Not Clipped=30
°
F. Clipped=10
°
F.
Air Coil Freeze Protection Limit Setting
- Jumper 3
(JW3-FP2 Low Temp) provides field selection of
temperature limit setting for FP2 to be 30
°
F or 10
°
F.
Not Clipped=30
°
F. Clipped=10
°
F.
Alarm Relay Setting
- Jumper 1 (JW1-AL2 Dry) pro-
vides field selection of Alarm Relay terminal AL2 to be
jumpered to 24Vac or to be dry (no connection).
Not Clipped=AL2 connected to R. Clipped=AL2 dry
contacts (no connection).
DIP Switches
Unit Performance Sentinel Disable
- Dip Switch 1
provides field selection to disable The UPS Feature
On = Enabled. Off = Disabled.
Stage 2
- Dip Switch 2 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
Table 8. LED & Alarm Relay Operations
Special Notes and Examples:
-Slow Flash = 1 flash every 2 seconds
-Fast Flash = 2 flashes every 1 second
-Flash code 2 = 2 quick flashes, 10 sec.
pause, 2 quick flashes, 10 sec. pause, etc.
Description of Operation
L E D
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 - FP1 Fault in memory Flashing Code 4
Cycling Code 4
Test Mode - FP2 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
