Comfort-Aire HBH Series 6-10 Tons - Manual (Page 25)

Heat Controller, Inc. HBH SERIES IOM Manual
24
CXM Control - For detailed control information, see CXM
Application, Operation and Maintenance (AOM) manual (part
# 97B0003N1)).
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.
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.
-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
CXM Controls
Description of Operation LED 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
Test Mode - Swapped Thermistor Flashing Code 9 Cycling Code 9
Table 6a: CXM LED And Alarm Relay Operations
� CAUTION! �
CAUTION! Do not restart units without inspection and
remedy of faulting condition. Equipment damage may occur.
CAUTION!
! !