Cruisair DX Original operating instructions

DX Built-In Air Cooled A/C Systems vINSTALLATION • OPERATION 2
Dometic Corporation
2000 N. Andrews Ave. Ext. • Pompano Beach, FL 33069-1497 USA
Phone: [phone] • Fax: [phone]
Website: www.dometic.com/marine • Email: [email protected]
Revised: 20140404
L-0261
P.O. Box 430
Milford, VA 22514
Phone [phone]
FAX [phone]
Distributed By:
For LP-10A
DIRECT EXPANSION SYSTEMS

WARNING
NOTICE
INTRODUCTION
This manual contains essential safety information
concerning the safe and proper installation of Cruisair
direct expansion air conditioning systems. It is very
important that you read and understand the contents of this
manual thoroughly before attempting to install any Cruisair
equipment. If there are any statements in this manual that
you do not understand, contact the Dometic Applications
Department for assistance. Phone [phone], Fax 954-
979-4414 (8:00 am - 5:00 pm United States EST).
As of July 1, 1992, United States federal law As of July 1,
1992, United States federal law prohibits the intentional
release of refrigerant gases into the environment, including
the R-22 refrigerant used in Cruisair air conditioning systems.
Special care must be taken when installing, charging
and servicing Cruisair equipment to prevent any loss of
refrigerant.
Cruisair does not recommend the practice of using
refrigerant to purge air and moisture from the system at
installation. This formerly used practice of purging is in
violation of United States federal law.
This manual covers installation procedures for Cruisair
direct-expansion air conditioning systems.
In addition, there are specic installation sheets for some
models which may be shipped with Cruisair air conditioning
equipment, providing additional details for specic
components.
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3
Chapter 1: Description of Basic Components...........................................................................................4
Basic Principles ..............................................................................................................................4
Cooling Unit....................................................................................................................................4
Controls/Switches...........................................................................................................................4
Condensing Unit.............................................................................................................................4
Figure 1. SA 3 Series Control..........................................................................................................4
Figure 2. SMX Series Keypad ........................................................................................................4
Chapter 2: Installation of Basic Components............................................................................................5
Cooling Unit....................................................................................................................................6
Control or Switch Assembly............................................................................................................6
Condensing Unit.............................................................................................................................6
Installation Kit.................................................................................................................................7
Figure 3. Minimum Grill and Free Air ..............................................................................................5
Figure 4. Diagram of Flared Joint ...................................................................................................7
Figure 5. Refrigerant Line Sizes .....................................................................................................8
Chapter 3: Start-Up Procedures - Final Inspection ...................................................................................9
Figure 6. Wire and Breaker Size.....................................................................................................9
Chapter 4: Start-Up Procedures - Initial Charging of A New System ......................................................10
Required Tools..............................................................................................................................10
Field Charging a System .............................................................................................................. 11
Removing Refrigerant from a System........................................................................................... 11
Figure 7a. Charging Pressure Charts for Equipment Built in 1994 and After................................12
Figure 7b. Charging Pressure Charts for Equipment Built Prior to 1994.......................................13
Chapter 5: Start-Up Procedures - Final Check-Out and Start-Up...........................................................14
Chapter 6: General Operation ................................................................................................................15
Operating Instructions - Rotary Knobs .........................................................................................15
Operating Instructions - SMX Series Controls..............................................................................16
Chapter 7: Maintenance .........................................................................................................................17
Cooling Unit and Switch Assembly...............................................................................................17
Condensing Unit...........................................................................................................................17
Chapter 8: System Failure Troubleshooting Guide..................................................................................18
Chapter 9: System Charging Troubleshooting Guide ..............................................................................19
Chapter 10: Installation Wiring Diagrams................................................................................................20
Index of Diagrams ........................................................................................................................20
Warning ..................................................................................................................................................31
Table of Contents

CHAPTER 1: Description of Basic Components
Basic Principles
The Cruisair air conditioning system consists of
three basic components and, in some cases,
several accessory parts. They are: (1) cooling
unit; (2) control or switch assembly; and (3)
condensing unit. This instruction manual will
describe and explain the function of the basic
parts of a Cruisair system and will outline the
installation, interconnection and startup of a
complete system. It also includes maintenance
and operation of Cruisair equipment in general.
Cooling Unit
The cooling unit is a refrigerant to air heat
exchanger coupled to a fan or blower which is
located in the space to be cooled. A cooling unit
is sometimes referred to as an ‘evaporator’ or a
‘cooling coil’, but in this manual, we will use the
term ‘cooling unit’. The cooling unit is constructed
of a series of copper tubes held in place by
vertical aluminum ns. Inside these tubes, the
refrigerant expands to produce a chilling effect
by absorbing the heat in the air. This air is forced
through the coil by the fan or blower.
Controls/Switches
There are two basic types of controls and
switches used with Cruisair systems: the SMX
series of microprocessor controls and the SA
family of rotary knob switch assemblies. The
Figure 1. SA 3 Series Control
Figure 2. SMX Series Keypad
SA type switch assembly has rotary knobs for
controlling the system. Figure 1 shows a typical
SA switch assembly.
The SMX series controls are advanced
microprocessor based systems, with more
than 20 user programmable functions. These
functions are described in the SMX series
owner’s manuals. Figure 2 shows an SMXII
control panel.
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Condensing Unit
The condensing unit consists of the
refrigerant compressor, the refrigerant
receiver, the refrigerant to air heat exchanger
or condenser, condenser fan or blower, the
associated electrical components, and the
system service valves.
The basic function of the condensing unit is to
compress the expanded refrigerant, owing back
from the cooling unit to the compressor, to a high
pressure state. The compressed refrigerant then
passes through the heat exchanger (condenser
coil) where it gives up the heat which was
absorbed in the cooling coil. It is then condensed
to a liquid state as it ows to the liquid receiver
and the process of ow back to the cooling unit
is repeated.
Filename: Fig2.EPS
Illustrator 7.0 10-28-97
Font: Helvetica, .047 pt.
Line weight: .5
Cooling Heating
Down Set Up
Inside Outside
Temp
Cool Off Heat
Manual
Mode
Slow Fan Fast
77

The following instructions should be followed,
in their proper sequence, when installing
Cruisair equipment. Read and understand the
instructions in this manual before proceeding.
Cooling Unit
In all installations, the cooling unit must be
installed so the air discharge grill is installed as
high as possible, (minimum three feet above the
oor level). The cooling unit must be installed
with the condensate drip pan positioned at the
bottom of the unit so the water dripping from the
evaporator coil collects in it before discharging
to a suitable drain outside. The cooling unit drain
must be installed so the drain tube makes an
immediate 1” drop after leaving the drain tting.
With discharge air grills located high, return
air grills should be located as close to the oor
as possible to provide the best pattern of air
ow. Avoid locating the return air grill in close
proximity to the discharge grill since the resulting
short circuiting effect of the air ow will impair
the effectiveness of the system.
Cooling units with model number prexes
EFB, EBH, or EFL should be mounted as high
as possible, directly behind the discharge grills.
CHAPTER 2: Installation Of Basic Components
Centrifugal or blower type cooling units,
model number prexes EBS, EBO, EHBO, EBL
or EHBL, should be mounted low, near the
return air grill, and the discharge air ducted to
the discharge grill mounted at a high level.
The cooling unit must be installed so there
is an adequate path for the air to re-circulate
freely into the unit from the space being cooled.
It is important that the cross sectional area of all
discharge grills be at least equal to the coil face
area of the discharge of the cooling unit involved.
An exception is the centrifugal blower type
cooling unit.
The cross sectional area refers to the ‘free air’
area of a discharge air grill rather than the total
area as determined by the overall measurement
of the grill itself. For instance, if a grill is made of
expanded metal, perhaps only 50% of the area
is open for the passage of air. The metal web
itself will block air from passing through the other
50%. In such cases, the total area of the grill must
be doubled to achieve the required open area.
Observe this carefully when selecting a grill.
The return air grills used should be the
type which have removable lters so they
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Minimum Grill And Free Air Area
EVAPORATOR DUCT GRILL AREA FREE AIR AREA
Type BTU’s Size In. Return (Sq. In.) Supply Return (70%) (Sq. In.) Supply (60%)
EBL 16,000 2 @ 5 144 2 @ 49 101 2 @30
EBO 4,000 4 64 32 45 19
7,000 5 72 49 51 30
10,000 6 100 60 70 36
14,000 7 144 80 101 48
16,000 7 144 80 101 48
EBS 14,000 7 144 80 101 48
16,000 7 144 80 101 48
EFB 10,000 NA 100 100 70 60
14,000 NA 144 144 101 87
16,000 NA 144 144 101 87
EBH 14,000 NA 144 144 101 87
16,000 NA 144 144 101 87
EFL 1,000 NA 40 40 28 24
14,000 NA 128 128 90 77
16,000 NA 128 128 90 77
Figure 3. Minimum Grill and Free Air