ir Cooled A/C Systems
INSTALLATION OPERATION 2
For LP-10A This manual contains essential safety information concern-
ing the safe and proper installation of Cruisair direct expan-
sion air conditioning systems. It is very important that you
read and understand the contents of this manual thor-
oughly before attempting to install any Cruisair equipment.
If there are any statements in this manual that you do not
understand, contact Taylor Made Environmental Applica-
tions Department for assistance. Phone (804) 746-1313,
Fax (804) 746-7248 (8:00am - 5:00pm United States
EST).
NOTICE
As of July 1, 1992, United States federal law prohibits the
intentional release of refrigerant gases into the environ-
ment, 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 refriger-
ant to purge air and moisture from the system at installa-
tion. This formerly used practice of purging is in violation of
United States federal law.
INTRODUCTION
WARNING
This manual covers installation procedures for Cruisair
direct-expansion air conditioning systems.
In addition, there are specific installation sheets for some
models which may be shipped with Cruisair air conditioning
equipment, providing additional details for specific compo-
nents.
2 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 - Intitial 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 fins. 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
Figure 1. SA 3 Series Control
Figure 2. SMX Series Keypad
family of rotary knob switch assemblies. The SA
type switch assembly has rotary knobs for control-
ling the system. Figure 1 shows a typical SA
switch assembly.
The SMX series controls are advanced micro-
processor based systems, with more than 20 user
programmable functions. These functions are
described in the SMX series owners manuals.
Figure 2 shows an SMXII control panel.
4
Condensing Unit
The condensing unit consists of the refrigerant
compressor, the refrigerant receiver, the refriger-
ant to air heat exchanger or condenser, con-
denser 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, flowing 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 flows to the liquid receiver
and the process of flow back to the cooling unit is
repeated.
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 instruc-
tions 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
floor 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 fitti