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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

R e v. : 4 J a n . , 2 0 1 2

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

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.

-Slow Flash = 1 fl ash every 2 seconds
-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

CXM Controls

Short test pins
together to enter Test
Mode and speed-up
timing and delays for
20 minutes.

Figure 27: Test Mode Pins

Table 6a: CXM LED And Alarm Relay Operations

Description of Operation

LED