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Mounting the Cooling/Heating Unit
Mount the cooling/heating unit (Figure 2) so the condensate
drip pan is beneath the unit. Use the integral mounting
brackets to secure the unit in place. Make sure the unit has
access for service. The blower, solenoid valve, and the
heater elements should be accessible. The electrical junction
box should be mounted in a location with easy access.
Route the condensate drain hose steadily downhill so that
the condensate flows freely to an overboard fitting or sump.
Do not permit condensation to puddle in the bilge. Cruisair
cooling/heating units have two condensate drains on
opposite corners. It is recommended to use both drains for
best results. If only one condensate drain is used then plug
the other fitting. Use Teflon tape on the hose barbs for a
watertight seal. The two drains may be teed together,
providing there is a minimum drop of 2" (50mm) from the
drain pan to the tee fitting. After the condensate drain
installation is complete, test the installation by pouring a
quart of water into the pan and checking for good flow.
Installing the Refrigerant Tubing
Caution
Be careful when bending the extension tubes on the
evaporators. Do not allow the tubing to kink and do not
twist or bend the tubing at the connection point close to
the coil or the joints may crack. If bending by hand make
large radius bends. Use a tube bender if a tight bend is
required.
Use refrigerant-grade soft copper tubing to connect the
cooling units to the condensing unit. See Figure 11 for
correct tubing sizes. Distribution manifolds or TEE connec-
tions may be used to split the refrigerant lines from the
condensing unit to the cooling units.
Only use refrigerant-grade seamless soft copper tubing.
Never use any type of plastic or rubber hose.
The tubes can run uphill, downhill, or sloping as required,
and can have as many bends as necessary. Avoid shard
bends that could result in kinks in the tubing.
The refrigerant distribution manifolds or TEE connections
should be located to provide (as close as possible) equal
length tubing runs between the manifold and each of the
cooling units. All flare connections should be made in an
accessible location for future service.
The suction line must be insulated with closed-cell foam
insulation. Do not insulate the suction and discharge lines
together. When sliding the insulation over the tubes, cover
the open ends to prevent debris and moisture from contami-
nating the refrigerant circuit. After checking for leaks, insulate
the flare joints at the condensing unit, distributors, and
cooling units. Secure the tubing every 3 feet (1m) as neces-
sary for support.
L-0952 Installation
The copper tubing is connected to the condensing unit,
distribution manifolds, and cooling units with flare joints. To
prevent refrigerant leaks, flares must be formed correctly
with the proper flaring tool. Only 45-degree single flares
should be used. Flares should be made following the
instructions of the particular flaring tool. Make sure to slide
the flare nut onto the tube before flaring. A drop of oil on the
tube can help the process. The surface of the flare must be
smooth and free of defects to ensure that the joint won't leak.
The flare should be large enough in diameter to fill the nut
completely.
Use only forged, long-stem flare nuts, such as supplied with
Cruisair equipment. Flare nuts should be tightened until the
nut ceases to offer resistance to tightening. This is the point
where the flared portion of the copper tubing is beginning to
flow under the force of the nut being tightened.
Installing The Air Distribution System
Refer to Figure 3 for a typical installation and to Figure 7 for
proper grill and duct sizes.
Return Air Grill
The return air grill should be located so there is unobstructed
airflow to the unit's evaporator coil. Ducting between the
return air grill and the cooling unit is not normally necessary
and should be avoided. The grill may be located on a side
opposite the evaporator coil so long as airflow to the coil is
unobstructed. Cross sectional area of the airflow path must
not be less than that of the evaporator coil face.
An air filter must be used to prevent the evaporator coil from
collecting dirt and lint. The filter can be located on the
evaporator coil or at the return air grill. Cooling units are
supplied with an air filter, but if that filter is not easily acces-
sible for periodic cleaning, then use a filter on the return air
grill.
Ducts
Insulated flexible ducting or built-in ducting must be used to
route air from the blower to the discharge grill.
Ducting Guidelines
Secure duct to blower or transition box (plenum) with screws
and duct tape. When using insulated flexible ducting, make
sure inner duct is secured and sealed to the adapter before
pulling insulation over connection.
Plenums, or transition boxes are used with flexible ducting to
split and route the discharge air as needed. Figure 8 shows
several plenum configurations.
10
English
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