Heat Controller HBH Series Installation, Operation & Maintenance Manual page 27

Heat Controller, Inc.
CXM Controls
Unit Performance Sentinel-UPS (patent pending): The
UPS feature indicates when the heat pump is operating
inefficiently. A UPS condition exists when:
a) In heating mode with compressor energized,
FP2 is greater than 125°F [52°C] for 30
continuous seconds, or:
b) In cooling mode with compressor energized,
FP1 is greater than 125°F [52°C] for 30
continuous seconds, or:
c) In cooling mode with compressor energized,
FP2 is less than 40°F [4.5°C] 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
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
HBH SERIES
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 inputs 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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IOM Manual