Cxm Controls - Carrier 50YER036 Installation, Operation And Maintenance Instructions

W a t e r- t o - W a t e r ( 5 0 Y E R ) S e r i e s - P u r o n
R e v. : 1 J u l y, 2 0 1 0

CXM Controls

CXM Control
For detailed control information, see the 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.
22
®
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.
Table 5a: CXM LED And Alarm
Relay Operations
Description of Operation
Normal Mode
Normal Mode with UPS Warning
CXM is non-functional
Fault Retry Slow Flash
Lockout Fast Flash
Over/Under Voltage Shutdown Slow Flash
Test Mode - No fault in memory Flashing Code 1
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
Flashing Code 7
shutdown in memory
Test Mode - UPS in memory Flashing Code 8
Test Mode - Swapped Thermistor Flashing Code 9
-Slow Flash = 1 flash every 2 seconds
-Fast Flash = 2 flashes every 1 second
-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
LED Alarm Relay
On Open
On Cycle (closed 5 sec., Open 25 sec.)
Off Open
Open
Closed
Open (Closed after 15 minutes)
Cycling Code 1
Cycling Code 2
Cycling Code 3
Cycling Code 4
Cycling Code 5
Cycling Code 6
Cycling Code 7
Cycling Code 8
Cycling Code 9