Comfort-Aire HWW120 - Manual (Page 21)

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Heat Controller, Inc. WATER-TO-WATER (HWW) SERIES Installation & Operation
CXM Controls:
For detailed control information, see the CXM Application,
Operation and Maintenance manual.
Field Selectable Inputs
Test mode: Test mode allows the service technician to check
the operation of the control in a timely manner. By momen-
tarily 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 set-
ting for FP2 of 30°F or 10°F [-1°F or -12°C] (refrigerant tem-
perature). 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 con-
tact (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: If Set to “EH2 normal,” EH2 will operate as
standard electric heat output.
On = EH2 Normal.
NOTE: Some CXM controls only have a 2 position DIP
switch package. If this is the case, this option can be se-
lected by clipping the jumper which is in position 4
of SW1.
Jumper not clipped = EH2 Normal.
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.
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 3a: CXM LED And Alarm
Relay Operations
Short test pins
together to enter
Test Mode and
speed-up timing
and delays for
20 minutes.
Figure 9: Test Mode Pins
CXM Board