REV 8/03
18
9. FIRESTAT ALARM
When return air temperature exceeds firestat temperature limit setting (menu #39). All blower, cooling,
heating, humidification, and dehumidification functions will be immediately terminated. The audio alarm is
activated and “FIRESTAT ALARM” message is displayed. The alarm will disappear when return air
temperature drops below the firestat limit setting and all functions will resume.
WARNING:
firestat alarm can be caused by the temperature sensor failure or incorrect calibration.
10. COMPRESSOR SHORT CYCLE
When the compressor has started 5 times within the past 30 minutes for any reasons (cooling or
dehumidification). A “COMP SHORT CYCLE” message is displayed and the audio alarm is activated. The
short cycle time delay between start to start of the same compressor is automatically increased from 5
minutes to 6 minutes for one hour. The alarm message will remain until one hour has elapsed without 10
compressor starts.
REMEMBER
this alarm is only a warning, it will not prevent the compressor from coming on.
11. POWER FAILURE
The power restart mode is selected in menu # 37 “ RESTART MODE”. The following is the sequence of
each mode:
AUTO: the unit will start automatically after a power failure or a reset. No audio or message.
AUTO M: the unit will start automatically after a power failure or a reset with alarm message only.
AUTO M: the unit will start automatically after a power failure or a reset with message and audio.
MANUAL: the unit will not start automatically after a power failure or a reset. An alarm message is
displayed and audio alarm is activated. Press the alarm silence button to manually restart unit.
12. TEMP SENSOR FAIL
Temperature sensor values are out of reasonable range. This may be caused by a bad sensor ( see
sensor troubleshooting) or incorrect wiring. When temp sensor fail alarm goes off, cooling will come on
and stay on until the alarm condition is corrected.
WARNING
:A temperature sensor failure will cause the firestat alarm to be inoperative.
13. HUM SENSOR FAIL
Humidity sensor values are out of reasonable range. This may be caused by a bad sensor (See sensor
troubleshooting) or incorrect wiring. When the humidity sensor fail alarm goes off, humidification and
dehumidification will be locked out until the alarm condition is corrected.
14. HIGH PRESSURE 1 ALARM (HI PRES C1)
High-pressure alarm for compressor is set on menu #40, “OPT ALARM 1”. This is default setting on this
menu for a DX unit. This alarm goes off when the high-pressure switch opens. “HIGH PRES C1” message
is displayed and audio alarm is activated. Compressor is off and alarm stays on until the high-pressure
switch is manually reset.
15. HIGH PRESSURE 2 ALARM (HI PRES C2)
Apply for dual compressor systems only. The high pressure 2 alarm is set on menu #41, “OPT ALARM 2”.
This is default setting on this menu for 2 compressors unit. This alarm goes off when the high-pressure
switch opens. “HIGH PRES C2” message is displayed and audio alarm is activated. Compressor is off
and alarm stays on until the high-pressure switch is manually reset.
CAUTION
: The unit needs to be checked-out by a qualified technician if it goes off on high pressure
frequently.
16. NO WATER FLOW (optional)
This alarm requires a flow switch that is wired to the alarm optional input and menu #42,“OPT ALARM 3”,
is set for “NO WATER FLOW”. When flow switch is opened, alarm will goes off until the alarm condition is
corrected.
17. SMOKE ALARM (optional)
This alarm requires a smoke detector that is wired to the alarm optional input and menu #41 or #42, “OPT
ALARM 2” or “OPT ALARM 3”, are set for “SMOKE ALARM”. When the smoke detector energizes, a
“SMOKE ALARM” message will display and audio alarm will activate. All the blower, cooling, heating and
humidifier will be locked out until the alarm condition is corrected.
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