Cruisair SMXht Operation & Programming Manual

Factory Memory Reset
To restore all programming functions to the Factory Setting, first switch to Off Mode and then
simultaneously press and hold the POWER and MODE keys. Hold keys for three seconds
while "00" flashes in the display. Successful memory reset is indicated by a "1" flashing back
and forth across the display; release keys. System returns to the Off Mode.
NOTE: Performing a Factory Memory Reset will not change the value of Function Numbers 21
& 22. Also note that Function Number 2, which displays Fahrenheit or Celsius, reverts back
to °F each time.
Fault Code Displays
If an operational failure occurs, such as low voltage or high/low pressure, a flashing fault code
message will be displayed. Fault code displays are canceled by pressing the POWER key.
Fault Code Summary Table
Fault Code
Operating voltage remained below acceptable
LO / AC limit for three minutes or more (100V for a 115V
system or 200V for a 230V systems).
Head pressure above 425 PSI.
HI / PS*
Head pressure below 30 PSI.
LO / PS**
PE Software program error.
* Indicates pump failure or loss of water flow.
**Indicates loss of gas; or water too cold for heating during Heat Mode.
Note: Procedures listed herein are for the SMXht keypad/display operating with an SMXII-HV
power/logic board.
See the SMX II Control Systems (DX) Installation/Operation manual for more detailed
instructions and information.
P.O. Box 15299 • Richmond, VA 23227-0699 • USA • 804-746-1313 • Fax: 804-746-7248
L-2367
Indication Result
Shutdown
Shutdown
Shutdown
Shutdown
SMXht Keypad/Display for DX
Basic Operation & Programmer's Pocket Guide
SMX II Series Control Systems for Direct Expansion
Basic Operation
Turning the System On:
Press the POWER or MODE keys to turn the system on. In three seconds, the system will
start operating in whatever mode it was running prior to the last shut down. Press the MODE
key prior to three seconds (while the display is flashing) to change mode before system
starts, or any time to change the mode while the system is on. The modes available are: Cool,
Heat, Auto Switchover (automatically switches from Cool to Heat Mode), or Dehumidification
Mode. A solid dot will light up next to the words COOL or HEAT when the compressor is on
and running in that mode.
Selecting the Setpoint:
Press the Up or Down Arrow keys to adjust the setpoint (press and hold keys to scroll); wait
three seconds after powering up system. The word SET will appear in the display while
setpoint is being adjusted. The setpoint range is 55-99°F (10-40°C). Inside cabin temperature
is continuously displayed.
L-2367 Rev. 10-6-04