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Refrigeration Systems • Installation
This section covers installation procedures for your refrig-
eration system. Please read the manual completely before
attempting to install any equipment.
This system is designed for certain capabilities and to operate
under certain conditions. Any change in design conditions may
result in lower capacities. Installer must understand: a) design
requirements for the system; and b) conditions under which
operation is expected and for which the system was designed.
See Figure 6 for tools and accessories.
Installing the Refrigeration Unit
Condensing Unit
Air/Water Combination
Locate in a dry area where a constant source of circulated air
is always available. Maximum air temperature for the system
to operate at full capacity is: 100°F/38°C. Temperatures above
this will result in reduced capacity of the air condensing system
and may cause compressor damage. Maximum water tem-
perature for full capacity is 90°F/32°C.
Any time a condensing unit is installed in an engine room,
water must be provided to the unit by way of a single station
pump, or a multi-station pump and a pump relay. The refrigera-
tion condensing unit must have its own pump trigger. Any
time a condensing unit is installed in an enclosed space (i.e. a
space that does not have airfl ow in and out equal to the airfl ow
through the condenser coil or a space that is less than 256
cu. ft. per compressor horsepower), then the customer must
provide fresh air or water fl ow. Provide water fl ow that is equal
to 250 GPH per compressor horsepower.
Cond. Unit
Min. Free Area
PMEA05
13 Cu. Ft.
KRA025
64 Cu. Ft.
KRA038
96 Cu. Ft.
KRA050
128 Cu. Ft.
If there are multiple units in a space, then add the minimum
free area to get the minimum free area total for all of the units.
This also applies to the space airfl ow. For example, a KRA025
and a KRA038 unit are in an enclosed space, below are the
area and airfl ow calculations:
64 Cu. Ft. + 96 Cu. Ft. = 160 Cu. Ft.
200 CFM + 200 CFM = 400 CFM
L-2091 Installation
Airfl ow
Water Flow
80 CFM
13 GPH
200 CFM
63 GPH
200 CFM
94 GPH
250 CFM
125 GPH
Evaporator
Flat Plates
Stainless steel evaporator plates are an excellent choice for
use in a bait freezing, fi sh keeping application. Plates without
a back should be mounted fi rmly and sealed to the box wall to
prevent debris from getting behind the plate where they cannot
be cleaned. Plates with backs may be mounted directly to the
wall, or mounted with stand-offs so that there is an air space
behind the plate. Care must be taken to route the connecting
tubes carefully to an accessible location outside the box. When
installing, consider the necessity of cleaning the box. Seal the
tubing exit holes to prevent ambient air intrusion. See Figure 4.
Wrapped Box
This type of box has a clean inside, because the evaporator
is wrapped around the outside of the box walls. In order to do
a proper installation of this type of wrapped evaporator box, it
is important to consider that the box may need to be serviced
or replaced at some time. The box must be installed in such
a way that it can be serviced or replaced without causing
damage to it or to its associated refrigeration lines or other
components. Dometic cannot be held liable for any damages
caused by moving the box. Service should be done by trained
professional technicians only. Please see the Owner's Limited
Warranty, Sections I & II, in this manual, for a full explanation
of what is and what is not covered under warranty.
Do not drill a hole in this box unless one is certain of the loca-
tion of the tubing. It is easy to drill a hole in the tubing resulting
in loss of refrigerant and the voiding of the warranty. In order to
detect location of refrigerant tubing, turn system on and watch
for frost lines. Frost lines will appear where there is tubing.
Insulation
Insulate all boxes with a minimum of 2" of R7 insulation. Use 4"
of R7 on vessels where power is not constantly available.
Constant Pressure Valve (CPV) and Linesets
The constant pressure valve comes with the liquid line, and
should be connected directly to the evaporator plate. Effi -
ciency will decrease the further the CPV is installed away
from the evaporator. The distance between the evaporator
and the CPV should be no more than 12". The other end of
the liquid line connects to the condensing unit. The suction line
connects the condensing unit to the plate. See Figure 13.
5
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English
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