Taylor Made Environmental SMX Series Operation Manual - page 18
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English
18
Note
Your system must be equipped with a high-pressure switch and
low-pressure switch for the high- and low-pressure shutdown to
operate. You should check with your dealer to make sure these
important protective devices are installed properly.
High Pressure Shutdown
In the cooling mode, if head pressure rises above 400-425 PSI
(usually caused by loss of cooling water flow, refrigerant gas
overcharge or dirty condenser) the SMX will attempt three
restarts, then shuts down the entire system. The display will
flash the legend HI-PS (for high pressure). This is a sustained
shutdown, and even when the pressure falls after shutdown,
the system will remain off until reset by pressing the OFF key.
In the heating mode, a rise in head pressure above the set limit
(usually caused by poor air flow or incorrect charge) will cause
the compressor to cycle off for two minutes, allowing the heat
in the coil to dissipate. This readies the system for recycling in
the heating mode. The compressor will then continue to cycle,
based on input from the high-pressure switch, until the cabin
temperature reaches setpoint, after which compressor cycling
is automatically restored to normal thermostatic control.
Lowpressure Shutdown
In the event system suction pressure drops and remains below
35 PSI for more than two minutes, the SMX will attempt five
restarts, then shuts down the entire system. The display will
flash LO-PS (for low pressure). This is a sustained shutdown,
and even when the pressure rises after shutdown, the system
will remain off until reset by pressing the OFF key.
In the cooling mode the low-pressure condition is usually
caused by substantial loss of refrigerant gas or poor air flow.
In the heating mode, it may be caused by loss of refrigerant or
extremely low seawater temperatures.
Low Voltage Shutdown
The low-voltage protection feature is always active. If AC line
voltage drops and remains below 100 volts (200 volts for a
230V system) for more than three minutes, the SMX shuts
down the entire system. The display will flash LO-AC (for low
AC). This is a sustained shutdown, and the system will not
resume operation even if the line voltage rises to normal levels.
To reset, press the OFF key.
Fault Shutdowns and Error Messages
The SMX control contains built-in safeguards designed to protect your air conditioning system from damaging conditions. These
are described below.
Note
For the low voltage shutdown function to work properly, the
SMX internal voltmeter must be properly calibrated. This is
normally accomplished at installation. To check or recalibrate
line voltage, see the AC Line Voltage Calibration section.
Software Error
Whenever power is applied to the SMX, the microprocessor
goes through an automatic self check and software loading
process. If all is well, the SMX loads the most recent operating
configuration from its internal memory, and turns on normally.
If a program fault is found during the self check, the error
message PE will be displayed.
Likewise, the self-diagnostic routine runs continuously
whenever the SMX system is on. If a system fault is detected,
the system shuts down, and the PE error message appears.
If this message occurs, contact your nearest Cruisair dealer, or
call the Factory Service Department in Richmond, Virginia
(804-746-1313) for assistance.
Determining Your Software Version Number
When you call your dealer or the factory for service assistance,
it’s helpful to know the Software Version Number for your SMX
system.
SMX II (Before 8-1-98)
To display your software number:
• Press OFF.
• Press OFF, SET and FAN simultaneously.
• Press COOL twice until display reads 68.
• Press UP once. The display should read Version
Number.
• Press SLOW until display reads F2.
• Press UP once. The display should read Revision Level.
SMX II and SMX Online Net