Cruisair SMXht Operation & Programming Manual
L-2367 L-2367
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.
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.
Rev. 10-6-04
P.O. Box 15299 • Richmond, VA 23227-0699 • USA • 804-746-1313 • Fax: 804-746-7248
SMXht Keypad/Display for DX
Basic Operation & Programmer’s Pocket Guide
SMX II Series Control Systems for Direct Expansion
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.
Fault Code Summary Table
Fault Code Indication Result
LO / AC
Operating voltage remained below acceptable
limit for three minutes or more (100V for a 115V
system or 200V for a 230V systems).
Shutdown
HI / PS*
Head pressure above 425 PSI. Shutdown
LO / PS**
Head pressure below 30 PSI. Shutdown
PE
Software program error. Shutdown
* Indicates pump failure or loss of water flow.
**Indicates loss of gas; or water too cold for heating during Heat Mode.
L-2367 L-2367
Adjusting the Fan Speed:
The FAN key is used to adjust the fan speed while in Manual Fan Speed Mode and to switch
from Manual to Automatic Fan Speed Modes. The fan may be run manually whether the
system is on or off. The word MANUAL appears in the display while in that mode. Automatic
Fan Speed Mode may be operated only when the system is on. Fan behavior also depends
on how the Fan Mode function is programmed - “C” for continuous or “I” for intermittent
running with the compressor (see Programming below).
Dimming the Display:
Press the MODE and Up Arrow keys simultaneously and repeatedly to select the display
brightness setting.
Backlight Mode:
While in the Sleep Mode (backlight is off) press any button to light the display, and then
operate as usual.
Important Memory Function:
After changing modes, programming settings, setpoint, etc., wait at least 30 seconds before
turning off main power supply in order for new settings to be maintained in memory.
Programming
SMXht keypad/display must be in the Off Mode prior to entering Programming Mode; pressing
the POWER key turns the display off or on. Once in the Off Mode, then:
1. Simultaneously press and hold the MODE and Down Arrow keys for three seconds.
Successful entry into the Programming Mode is indicated by the word “PROG” and a
flashing “1” in the display.
2. Use the Up or Down Arrow keys to scroll until the desired program Function Number is
displayed.
3. Press the MODE key to enter the desired function. The current value and the word
“PROG” will be displayed.
4. Use the Up or Down Arrow keys to change the value of that program.
5. Press the POWER key to save the new settings, exit the Programming Mode, and return
to the Off Mode.
Note: If SMXht is programmed for displaying °C (rather than the factory setting °F), then
functions 3 & 4 should be adjusted. For function 3, the factory setting of 12 (or 1.5°F) should
be changed to 7 (7/8 = 0.8°C). For function 4, the factory setting of 4 (or 0.5°F) should be
changed to 2 (2/8 = 0.3°C). For these functions, 1°F (or 8) = 0.6°C (or 5).
See Programming Summary Table.
Programming Summary Table for SMXht Keypad/Displays
Programmable Function
Function
Number
Factory
Setting
Range
Compressor Time Delay 1 0 0 - 70 sec
Fahrenheit/Celsius 2 F F or C
Compressor Differential 3 12 (12/8 = 1.5˚) 2 to 31
Fan Response Differential 4 4 (4/8 = 0.5˚) 2 to 31
Low Fan Speed 5 38 2 to 57
High Fan Speed 6 60 41 to 99
Fan Mode 7 C C or I
AC Line Voltage Calibration 8 - ± 1%
Temperature Calibration 9 - ± 1%
HU (Humidity) Precirculation 10 10 (min) 0 to 30 min
HU Dehumidification 11 30 (min) 10 to 60 min
HU Time Period 12 12 (hrs) 2 to 16 hrs
Variable or 2-Speed Fan
(2-Speed Fan for SMX Net only)
13 F1 (variable)
F1 or
F2 (2-Speed)
High to Low Speed Adjustment
(
2-Speed Fan for SMX Net onl
y)
14 38 00 to 6E
Software Version 15
Software Revision 16
Low Pressure Switch Test 17
OA = Okay
FA = Fault
n/a
High Pressure Switch Test 18
OA = Okay
FA = Fault
n/a
LED Segment Test 19
Lights all LED
Segments
n/a
Backlight Mode 20 On
On = continuous
SL = sleep mode
Select DX or TW power/logic board 21 dE
dE=DX or CH=TW
(do not change)
Select SMXII power/logic board.
(SMX Net will be available in future)
22 II
II or nE (Net)
(do not change)
Current Version
Current Revision
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