Cxm Controls - Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual

SAFETY FEATURES - CXM CONTROLS
Condensate Overflow: The condensate
overflow sensor must sense overflow level for
30 continuous seconds to be recognized as a
CO fault. Condensate overflow will be
monitored at all times.
CO lockout code = 6
Over/Under Voltage Shutdown:: An
over/under voltage condition exists when the
control voltage is outside the range of 19VAC
to 30VAC. Over/under voltage shut down is
a self-resetting safety. If the voltage comes
back within range for at least 0.5 seconds,
normal operation is restored. This is not
considered a fault or lockout. If the CXM is
in over/under voltage shutdown for 15
minutes, the alarm relay will close.
Over/under voltage shut down code = 7
Unit Performance Sentinel-UPS: The
UPS feature indicates when the heat pump is
operating inefficiently. A UPS condition
exists when:
b) In heating mode with compressor
energized, FP2 is greater than 125°F for
30 continuous seconds, or:
b) In cooling mode with compressor
energized, FP1 is greater than 125°F for
30 continuous seconds, or:
c) In cooling mode with compressor
energized, FP2 is less than 40°F for 30
continuous seconds.
If a UPS condition occurs, the control will
immediately go to UPS warning. The Status
LED will remain on as if the control is in
normal mode. Outputs of the control
excluding LED and alarm relay, will NOT be
affected by UPS. The UPS condition cannot
occur during a compressor off cycle. During
UPS warning, the alarm relay will cycle on
and off. The cycle rate will be "on" for 5
seconds, "off" for 25 seconds, "on" for 5
seconds, "off" for 25 seconds, etc.
UPS warning code = 8
HTV/HTD/HTH SERIES
Swapped FP1/FP2 thermistors: During test
mode, the control monitors to see if the FP1
and FP2 thermistors are in the appropriate
places. If the control is in test mode, the
control will lockout with code 9 after 30
seconds if:
a) The compressor is on in the cooling
mode and the FP1 sensor is colder than
the FP2 sensor,, or:
b) The compressor is on in the heating
mode and the FP2 sensor is colder than
the FP1 sensor.
Swapped FP1/FP2 thermistor code = 9
DIAGNOSTIC FEATURES
The LED on the CXM board advises the
technician of the current status of the CXM
control. The LED can display either the
current CXM mode or the last fault in memory
if in test mode. If there is no fault in
memory, the LED will flash Code 1 (when in
test mode).
CXM CONTROL START-UP OPERATION
The control will not operate until all input s and
safety controls are checked for normal
conditions. The compressor will have a 5
minute anti-short cycle delay at power-up.
The first time after power-up that there is a
call for compressor, the compressor will
follow a 5 to 80 second random start delay.
After the random start delay and anti-short
cycle delay, the compressor relay will be
energized. On all subsequent compressor
calls, the random start delay is omitted.
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CXM CONTROLS

Heat Controller, Inc.