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English
L-2066 Operation
Using The Humidity
Control Routine
When engaged, the SMX humidity control routine automati-
cally turns the air conditioning system on at timed intervals
to remove moisture from the air. The system is pro-
grammed at the factory for average values. To change the
factory settings, see “Humidity Control Program”.
To start the dehumidification program:
• Press OFF.
• Press COOL, HEAT and FAN keys simultaneously.
For the SMXir Remote Control only
- Press the
Dehumid key to enter dehumidification mode.
• The data display will flash HU, indicating that the
program is active.
• To halt the dehumidification program, press any key. The
HU message will stop flashing.
Safety Note
Whenever the SMX system is in the dehumidification mode,
all of the system safeguard controls remain active. If the
seawater flow fails or if line voltage falls below preset limits,
the system will automatically shut down. If AC power is in-
terrupted, the system will automatically resume operation in
the dehumidification mode when power is restored.
Anti-Ice Routine
The SMX control will occasionally shut down the compres-
sor in the cooling mode to allow any ice that may have
formed on the evaporator coil to melt. The anti-ice shut-
down only occurs at inside temperatures lower than 70°F
(21°C).
In a 10-minute cycle period, the compressor will shut off for
15 seconds per degree below 70°F. For example, if the
inside temperature is 67°F, the compressor will shut off for
45 seconds every 10 minutes.
Seawater Temperature and
Your Cruisair System
The basic principle behind an air conditioner or a heat
pump is the movement of heat. In an air conditioner, heat is
removed from the inside cabin and released to the seawa-
ter. In reverse-cycle heating, the refrigerant flow is reversed
and heat is extracted from the seawater and discharged
into the living space. The efficiency of the system operation
depends on both the seawater and cabin temperatures.
In cooling, the air conditioner will work best in seawater
temperatures below 90°F (32°C). At higher water tempera-
tures, the unit may work, but at reduced capacity. A high-
pressure shutdown can occur at higher water temperatures.
In heat mode, the opposite is true. As the water gets colder,
there is less heat available, and the heating performance
drops. Full heating capacity is obtained at about 55°F
(13°C). Performance drops to about 50% of rated capacity
in 40°F (4.4°C) water. Below this, the system pressure can
be so low that the unit will shut down on low-pressure fault.
This problem is compounded when the cabin is cold also.
The low pressure shutdown routine is such that the unit will
try many times to heat up the cabin enough to raise system
pressure and continue running.
Warning
Do not operate your A/C unit in water that is colder
than 38°F (3.3°C). Doing so could lead to water
freezing in the condenser coil which can cause
damage to the unit.
Programming the SMX II System
SMX control systems are programmed at the factory for
average values. For optimum performance, you may wish to
change these settings to suit your individual preferences.
All programming steps are entered by pressing the OFF
key, followed by the SET key, then simultaneously depress-
ing the two or three keys noted in the table below. Success-
ful entry into a programming mode is indicated by the
presence of a decimal point to the right of the two displayed
characters. To raise or lower a value, touch the UP or
DOWN keys. To exit the programming mode, touch the OFF
key. (The SMXir Remote Control can not be used to
program the system.)
Factory Memory Reset
You can use the memory-reset sequence to restore all
programmed functions to the factory default settings.
To restore programmed functions to factory setting:
• Press OFF, SET and FAN simultaneously.
• Press SET.
• After a delay, the memory will be reset from stored
values. After another delay, the display will come back on
normally.
Summary of Contents for Cruisair SMX II
Page 20: ...20 L 2066 Fig 1 SXR7 16CK 115 230V 50 60Hz...
Page 21: ...21 L 2066 Fig 2 SX7 24CK 115 230V 50 60Hz...
Page 22: ...22 L 2066 Fig 3 FX5 36CK 115 230V 50 60Hz...
Page 23: ...23 L 2066 Fig 4 FX48RC 230V 50 60 Hz...
Page 24: ...24 L 2066 Fig 5 FX20DC FX48EC 230V 460V 3Ph 50 60Hz...
Page 25: ...25 L 2066 Fig 6 SMXII Retrofit Typical 3 knob...
Page 26: ...26 L 2066 Fig 7 SMXII Retrofit F20C 48RC to 3 knob term strip...
Page 27: ...27 L 2066 Fig 8 SMXII Retrofit F20C 48RC to condensing unit...
Page 28: ...28 L 2066 Fig 9 Cable Diagrams Old and New P L Boards...
Page 29: ...29 L 2066 Fig 10 SMXIR Mounting Template and Instructions...
