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• Ducting must be properly sized for the airflow. If the duct
run is longer than 10 feet (3m), use the next larger duct
size.
• Use of insulated duct is recommended, and is mandatory
when used in high heat areas or where condensation
might occur.
• Rotate blower in the direction of the duct run if possible.
• Install flexible ducting tightly and smoothly, with as few
bends as possible.
• Keep duct runs as short as possible.
• Support ducting to prevent sagging during boat operation.
• Trim excess ducting before attaching to transition adapt-
ers.
• Make sure ducting is not crushed or kinked.
• Use a flexible transition duct between blower and any
built-in ducting.
Discharge Air Grill
Location of the discharge grill should be as high as possible
in the cabin (minimum three feet (1m) above the floor), and
oriented so that airflow between the discharge and return
encompasses as great an area as possible. Care should be
taken to avoid "short cycling," a situation where the condi-
tioned air is blown directly back to the evaporator coil without
being substantially mixed with the cabin air.
A grill plenum should be incorporated behind the grill to
provide a chamber for the air to expand and flow quietly into
the living area. The plenum also provides a hose connector
to attach the flexible duct behind the grill. (See Figure 8.)
Installing the Cooling Unit Control
Each independent cooling unit in the modulating system will
have its own control. Refer to the wiring diagrams in the back
of this manual.
SMX II Control System
The SMX II control system consists of:
Power/Logic (P/L) module - Monitors and controls all
functions of the cooling unit.
Keypad/Display - The SMXir is a 10-button user interface
touch pad with a digital readout and LED indicators.
Temperature-Sensing Element - Air temperature is
monitored by a temperature-sensing element (TSEP) that
plugs into the power/logic board.
Connecting Cable - The keypad/display connects to the P/L
board with a CXP connecting cable.
L-0952 Installation
Warning
Make sure all power is off before opening any electrical
box. Failure to do so may result in injury or death.
Installing the Power/Logic Box
The Power/Logic box has a 3 ft (.9m) wire harness that must
be connected to the air handler junction box. These wires
can be extended if needed. Refer to installation diagrams in
back of this manual.
• It is very important that the P/L box is mounted in an
accessible location.
• The SMX P/L board is ignition protected, enclosed, and
operates in ambient temperatures up to 130°F (54°C).
• The P/L box may be installed in any position.
• The P/L board dissipates heat when operating, and must
be installed in a ventilated location.
• The P/L box is NOT waterproof and must be placed where
it will NOT get wet.
Installing the SMXir Keypad/Display
The SMXir keyboard/display should be installed so it is both
visible and accessible. It should be placed in plain view and
within easy reach of the operator.
Select a spot on an interior, vertical surface. This can be an
inside wall, partition or other permanent structure with rear
access for wiring. The SMXir control operates on low voltage
DC and is certified ignition-protected. The space behind the
SMXir control does not have to be ventilated since the
control components do not produce heat.
The SMXir keypad is surface mounted, and only requires a
hole for the CXP cable. Refer to Figure 10 in the back of this
manual for installation instructions. Plug the interconnect
cable in and route it to the Power/Logic (P/L) box.
SMX Interconnect Cable
Connection between the SMXir keypad and the Power/Logic
board should be made with a CXP cable. This is a shielded
cable with RJ12 (phone-type) 6-pin plugs on each end.
CXP cables are available in different lengths, from 2 feet
(.6m) to 80 feet (24m). Route the cable from the power/logic
board to the keypad. Cable runs should be as short as
possible and should not be bundled with high voltabe or
antenna cables. Plug the cable in at both ends, and secure
per low DC voltage standards.
Caution
The CXP interconnect cable transmits low voltage DC
signals. It can be affected by outside interference from
high voltage cables or other sources. Do not route the
SMX interconnect cable beside AC power cables or
other high voltage wiring.
11
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