Trane CGAD020 Owner's manual

Installation
Operation
Maintenance
Air-Cooled Condenser
Scroll Compressor
20 to 150 TR
50 / 60 Hz
CGAD-SVN02C-ENNovember 2015
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and
training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or
serious injury. When working on the equipment, observe all precautions in the literature and on the tags,
stickers, and labels that are attached to the equipment.
Models: 50 or 60 Hz
CGAD020 CGAD040
CGAD025 CGAD050
CGAD030 CGAD060
CGAD070 CGAD100
CGAD080 CGAD120
CGAD090 CGAD150

CGAD-SVN02C-EN2
Important Notice
Refrigerant Emission Control
The conservation and reduction of gas
emissions should be reached by following
the operational and service procedures
recommended by Trane, with special
attention to the following:
The refrigerant used in any type of air-
conditioning equipment should be
recuperated and/or recycled to be used
again, captured or completely destroyed
whenever it is removed from the
equipment. It should never be released
into the atmosphere.
Always consider the possibility of recycling
or reprocessing the refrigerant transferred
before beginning the recuperation by any
method. Questions about recuperated
refrigerants and acceptable qualities are
described in norm ARI 700.
Use approved and safe cylinders. Comply
with all the applicable safety and
transportation norms when transporting
the refrigerant containers.
In order to minimize emissions when
transferring the refrigerant gas, use
recycling equipment. Always use methods
that make the lowest vacuum possible
when recuperating and condensing the
refrigerant inside the cylinder.
Important:
Since Trane do Brasil has continual development of its products as a policy, it reserves the right to
change its specifications and drawings without prior notice. The installation and maintenance of the
equipment specified in this manual should be done by qualified technicians and/or technicians
approved by Trane. The lack of following and/or adopting the procedures presented in this manual
could imply in the product losing its warranty.
IMPORTANT:
Dimensional measuring units on this
catalog are on milimitres (mm). (Exept
for those locally referencied).

CGAD-SVN02C-EN 3
Contents
Important Notice 02
Contents 03
Model Number 04
General Data 05
Unit Inspection 06
General Information 07
Transportation and Movement 08
Clearances for Maintenance and Air Circulation 09
Clearance between Units and sound Pressure 10
Application Considerations 11
Checklist for Initial Start 16
Operational Conditions 17
Calculating Subcooling and Superheat 19
Refrigeration Cycle 20
Table for Regulating R-407c 21
Operational Procedures 22
Maintenance Procedures 27
Electrical Data 29
Screens 32
Global Connector 35
Wiring Diagram 36
Diagnostics CH530 73
Troubleshooting 78
Standard Conversion Table 84

CGAD-SVN02C-EN4
Model Number
The product's code describes the configuration, capacity, and optional characteristics. It is very important to
indicate the correct order of the equipment's code in order to avoid future problems when delivering them. Above
you will find the description of each digit that makes up the product code.
Digits 1, 2 - Unit Model
CG = "Cold Generator" Scroll Chiller
Digit 3 - Unit Type
A = Air Cooled
Digit 4 - Model Series
D = Sequence D
Digits 5, 6 e 7 - Nominal Capacity
020 = 20 Ton.
025 = 25 Ton.
030 = 30 Ton.
040 = 40 Ton.
050 = 50 Ton.
060 = 60 Ton.
070 = 70 Ton.
080 = 80 Ton.
090 = 90 Ton.
100 = 100 Ton.
120 = 120 Ton.
150 = 150 Ton.
Digit 8 - Unit Voltage
C = 220/60/3
J = 380/60/3
D = 380-400/50/3
4 = 440-460/60/3
Digit 9 - Manufacturing Location
B = Curitiba Plant - Brazil
Digits 10,11 - Sequence of Modifi. minor of
Project
A0 - Sequence A0 (Defined by factory)
Digit 12 - Certifying Agency
N = No certification
Digit 13 - Refrigerant Type
4 = R407c
Digit 14 - Expansion Valve type
N = Thermostatic
C G A D 1 5 0 J B A 0 N 2 N N A N 0 N N N N N N N N 0 N P 0 0 0 N
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2 0 21 22 23 24 25 26 27 28 29 30 31 32 33
Digit 15 - Evaporator Application
N = Standard Cooling (40 - 60°F)
Digit 16 - Coil Type
A=Aluminium fins
S = Yellow Fin
Digit 17 - Piping Configuration
N = Standard
A = Service valves on suction and discharge
lines
Digit 18 - Digit Reserved
0 = Reserved
Digit 19 - Feed Type
N = Terminal Block
D = Disconnector Key
C = Circuit Breaker
Digit 20 - Remote Operation Interface
N = No Remote Interface
C = Tracer Comm3 Interface
L = Comm5 - LonTalk Compatible (LCI-C)
Interface
Digit 21 - Input controls
N = No controls
R = External Leaving Water Setpoint
Digit 22 - Output controls
N = No controls
A =Alarm Relay Output
Digit 23 - Electrical Accessories
N = No acessories
Digit 24 - Control Panel Accessories
N = No acessories
Digit 25 - Protection panels
N = No Protection panels
Digit 26 - Installation accessories
N = Without Installation accessories
R = Neoprene Vibration isolators
F = Adapter Kit for Flange
G = Isolator and Flange adapter kit
Digit 27 - Digit Reserved
0 = Reserved
Digit 28 - Digit Reserved
0 = Reserved
Digit 29 - Language - Literature/Labels
P = Portuguese/Spanish
Digit 30 - Digit Reserved
0 = Reserved
Digit 31 - Digit Reserved
0 = Reserved
Digit 32 - Digit Reserved
0 = Reserved
Digit 33 - Product Type
N = Standard
Z = Special

CGAD-SVN02C-EN 5
General
Data
Table 01 - General Data - CGAD 20-150 TR - 50 or 60 Hz
Notes:
(1) Data based on operational conditions established by standard ARI550/590-03.
(2) MCA values referes to 380 / 60 Hz power supply.
(3) Ratings based on global consumption (compressors and fans).
(4) MCA values referes to 380 / 50 Hz power supply.
(5) These measurements take into consideration the depth of the electrical frame attached to the equipment.
(6) These measurements of floor space do not take into consideration the base of the electrical frame attached to the equipment.
(7) The adapters for Victaulic connection type are not provided in standard option.
(8) Operating W eight includes refrigerant and water weight.
(9) Shipping Weight includes only refrigerant weight.
M o d e l ( 1 ) C G A D 0 2 0 C G A D 0 2 5 C GA D 0 3 0 C G A D 0 4 0 C G A D 0 5 0 C G A D 0 6 0 C G A D 0 7 0 C G A D 0 8 0 C G A D 0 9 0 C G A D 10 0 C G A D 12 0 C G A D 15 0
C ap acit y To ns 17,9 2 1,4 2 6 ,5 3 6 ,1 4 2 ,8 52,6 6 5,7 76 ,2 8 2 ,6 9 5,3 116 ,8 14 4 ,0
Syst em KW (3 ) 2 0 ,0 2 7,2 3 0 ,7 4 1,3 53 ,9 6 1,6 71,8 8 2 ,2 9 3 ,9 10 6 ,5 13 5,3 156 ,5
N o minal A mp s ( 2 ) A 54 ,0 6 8 ,0 78 ,0 9 7,0 12 3 ,0 14 2 ,0 16 3 ,0 192 ,0 2 10 ,0 2 55,0 2 9 5,0 3 76 ,0
Ef f ic iency ( 3 ) E.E.R . 10 ,8 9 ,4 10 ,4 10 ,5 9 ,5 10 ,2 11,0 11,1 10 ,5 10 ,7 10 ,4 11,0
KW / TR 1,115 1,2 73 1,157 1,14 3 1,2 58 1,171 1,0 9 3 1,0 79 1,13 7 1,118 1,158 1,0 8 7
C ap acit y To ns 15,5 18 ,6 2 3 ,0 3 1,2 3 7,2 4 5,5 56,5 6 5,4 71,2 8 5,2 10 4 ,7 12 8 ,6
Syst em KW (3 ) 16 ,8 2 3 ,0 2 5,8 3 4 ,6 4 5,6 51,8 59 ,9 6 8 ,9 78 ,4 9 5,4 12 1,0 14 0 ,5
N o minal A mp s ( 4 ) A 4 5,0 57,0 6 5,0 8 0 ,0 110 ,0 116 ,0 13 0 ,0 15 0,0 170 ,0 19 0 ,0 2 2 5,0 2 8 4,0
Ef f ic iency ( 3 ) E.E.R . 11,1 9 ,7 10 ,7 10 ,8 9 ,8 10 ,6 11,3 11,4 10 ,9 10 ,7 10 ,4 11,0
KW / TR 1,0 8 6 1,2 3 8 1,12 3 1,10 9 1,2 2 7 1,13 7 1,0 6 0 1,0 53 1,10 2 1,119 1,155 1,0 9 3
M o d el ( 6) S Z 12 5 S Z 18 5
SZ 12 5 S Z 18 5 S Z 12 5 SZ 18 5 SZ 12 5 S Z 18 5 S Z 18 5 S Z 12 5
S Z 18 5
S Z 12 5 S Z 18 5 SY 3 0 0 SY 2 4 0 SY 3 0 0
Typ e Scro l l Scr o ll Sc ro ll Scr o ll Sc ro ll Scr o ll Scr o ll Scr ol l Scr o ll Scr o ll Scr o ll Scr o ll
Quant it y 2 1 / 1 2 4 2 / 2 4 2 / 4 4 / 2 6 4 6 6
N o minal C ap acit y To ns 10 15/ 10 15/ 15 10 15/ 10 15 15 / 10 15 / 10 15 2 5 2 0 2 5
W at er St o rag e Lit er s 4 4 4 1 6 2 52 79 14 3 151 14 3 12 2 12 2 173 2 77
M i n. w at er f l o w rat e m3/ h 5,5 6 ,8 8 ,2 10 ,9 13 ,6 16 ,4 2 1,8 2 7,3 2 7,3 3 2 ,7 4 0 ,9 4 9 ,1
M ax. wat er f lo w rat e m3/ h 16 ,4 2 0 ,4 2 4 ,5 3 2 ,7 4 0 ,9 4 9 ,1 6 5,4 8 1,8 8 1,8 9 8 ,1 12 2 ,7 14 7,2
Inlet co nnect io n 2 " 2 " 2 1/ 2 " 2 1/ 2 " 3 " 4" 4 " 4 " 4 " 4 " 6 " 6 "
Out let co nnect i on 2 " 2 " 2 1/ 2 " 2 1/ 2 " 3 " 4" 4 " 4 " 4 " 4 " 6 " 6 "
Typ e
N o . o f co ils 2 2 2 4 4 4 4 4 4 4 4 4
T o t al f ac e ar ea m24 ,7 4 ,7 4 ,7 8 ,5 11,0 11,0 14 ,0 14 ,7 14 ,7 13 ,1 16 ,9 19 ,5
Fins p er inches 16 16 14 16 16 16 14 14 14 16 16 16
N o . o f ro ws 2 2 3 2 2 2 3 3 3 3 3 3
2 3 3 4 6 6 6 8 8 6 8 10
D iamet er mm 76 2 76 2 76 2 76 2 76 2 76 2 76 2 76 2 76 2 76 2 762 76 2
A ir f lo w rat e m3/ h 3 2 .6 2 0 4 5.8 70 4 4 .170 6 4 .560 9 5.14 0 9 5.14 0 9 7.6 9 0 12 2 .3 3 0 12 2 .3 3 0 9 8 .118 13 0 .8 2 4 16 3 .53 0
R PM R PM 114 0 114 0 114 0 114 0 114 0 114 0 114 0 114 0 114 0 114 0 114 0 114 0
M o t or p o wer KW 1,12 1,12 1,12 1,12 1,12 1,12 1,12 1,12 1,12 1,12 1,12 1,12
T ransmi ssi o n t yp e D ir ect D ir ect D ir ect Di rect D ir ect D ir ect D ir ect Di r ect Di rect Di rect D i rect D ir ect
Heig ht mm 18 4 0 ,5 18 4 0 ,5 18 4 0 ,5 2 19 0 ,5 2 19 0 ,5 2 19 0 ,5 2 190 ,5 2 19 0 ,5 2 19 0 ,5 2 3 76 ,0 2 3 76,0 2 3 76 ,0
Lengt h ( 4 ) mm 2 19 5,0 2 19 5,0 2 19 5,0 2 3 8 9 ,0 29 8 9 ,0 2 9 8 9 ,0 3 6 9 5,0 3 9 0 3 ,0 3 9 0 3 ,0 3 4 2 5,0 4 9 4 9 ,0 49 4 9 ,0
W id t h mm 13 50 ,0 170 0 ,0 170 0 ,0 18 8 0 ,0 18 80 ,0 18 8 0 ,0 18 8 0 ,0 18 8 0 ,0 18 8 0 ,0 2 2 4 2 ,0 2 2 4 2 ,0 22 4 2 ,0
Fo o t p ri nt area ( 5 ) m22 ,70 0 3 ,4 0 0 3 ,4 0 0 3 ,9 4 0 5,2 50 5,2 50 6 ,58 0 6 ,9 70 6 ,9 70 7,2 3 7 10 ,6 54 10 ,6 54
R ef rig er ant t yp e St and ard R- 4 0 7C R-4 0 7C R-4 0 7C R- 40 7C R- 4 07C R -4 0 7C R -4 0 7C R -4 0 7C R -4 0 7C R- 40 7C R -4 0 7C R- 4 0 7C
N o . o f circuit s 1 1 1 2 2 2 2 2 2 2 2 2
50 / 10 0 4 0 / 10 0 50 / 100 2 5 / 50 2 0 / 4 0 2 5 / 50 2 9 / 5 7 3 1/ 6 3 3 3 / 6 7 2 5/ 50 17 / 3 3 17/ 3 3
75 / 10 0 70 / 10 0 75 / 10 0 79 / 10 0 8 1/ 10 0 8 3 / 10 0 75/ 10 0 6 7 / 10 0 6 7 / 10 0
Op erat ing w eig ht Kg 13 4 0 14 2 0 14 8 0 1910 22 10 2 500 3 0 0 0 3 2 4 0 3 2 2 0 3 775 4 13 5 4 6 53
Shi p pi ng w eig ht Kg 13 0 0 13 8 0 14 2 0 18 6 0 2 13 0 2 3 6 0 2 8 50 3 10 0 3 10 0 3 6 53 3 9 6 2 4 3 76
C o m p r e s s o r
5 0 H z
C ap acit y st ag es
E v a p o r a t o r
6 0 Hz
C o n d e ns e r
F a n s
G e ne r a l D a t a
Quant it y
A luminum f ins, 3 / 8 " - O D co p p er t ub es

CGAD-SVN02C-EN6
Unit Inspection
Upon receiving the unit at the installation
site, proceed as follows:
- Make sure that the data on the nameplate
are the same as the data contained on the
sales order and shipping invoice
(including electrical data).
- Make sure that the local power supply
conditions comply with the specifications
on the identification plate.
- Carefully inspect the unit for damages
occurred during transportation. Report any
damage or material shortage immediately
to the carrier. Make a “unit damage”on the
carrier’s delivery receipt. Specify the type
and extend of damage.
- Notify Trane do Brasil and/or the
installation company about the damages
and the actions required for repairs. Do not
repair the unit until the damages have
been inspected.
Storage
If the unit cannot be installed in its
permanent location at the time of delivery,
store it in a safe place, and protect it from
exposure to the wheater and other factors
that may damage it. Storage, as well as
inappropriate moving of the equipment,
will imply in the equipment losing its
warranty.
Instructions for proper installation
Consider the following items for a correct
installation before placing the unit in its
location:
- The floor and unit base should be level,
solid, and strong enough to bear the
Unit Inspection
weight of the unit and its accessories.
Level or repair the floor at the location
where the unit will be installed before
placing it.
- Make sure units have rubber skids or
vibration isolators.
- Provide the minimum clearances
recommended for routine maintenance
and services; see page 12 of this manual.
- The same distances apply in case of
various units together.
- Provide the electrical installation. The
units are designed so that they can receive
electrical hookups from either side.
- Make sure there is enough space for the
piping and to remove the covers.
- The supply of electrical power should
comply with the Norm NBR 5410 and local
and/or NEC codes.
- The installer should provide and install
the hydraulic piping to connect the air-
conditioning units to the CGAD liquid
chiller.
General Safety
CGAD units are designed to work safely
and in a reliable manner when operated
according to the safety norms. The system
works with electrical, mechanical, water
and gas pressure components, as well as
many other components that can cause
personal damage to people and
equipment if they do not comply with the
needed safety norms.
Therefore, only specialized and/or Trane-
authorized installers should carry out
installation, start-up, and maintenance on
this type of equipment.
Follow all the safety regulations related to
the work and the warning signs on the
stickers placed on the units, and always
use appropriate tools and equipment.
Identifying Danger
WARNING!!
Warnings appear at appropriate
locations throughout this manual in
order to alert operators and service
personnel about situations of
potential risk that COULD result in
severe personal injury or damage to
the equipment if safety regulations
are not followed.
!
Cautions appear at appropriate
locations throughout this manual in
order to alert operators and service
personnel about situations of
potential risk that could damage the
equipment or the environment.
CAUTION:

CGAD-SVN02C-EN 7
General Information
Identification labels
The unit identification labels
CGAD are fixed in surface foreign
of door the control Panel. The plates
of identification the compressor
are fixed on own compressor.
See figure the front view/ side external
the CGAD. For location and identification
of the same.
Fig. 01 - Identification labels

CGAD-SVN02C-EN8
Dispatch and Handling
1. The CGAD Cooling units leave the plant
ready to be installed, tested as needed,
and with the correct level of oil and
refrigerant for operation.
2. When the unit arrives, compare all the
data on the plate with the information on
the order and invoice.
3. In order to receive the unit, run a visual
check on all the components, tubing, and
connections in order to make sure that
there are no dents or leaks caused by
handling during transportation. If there are
any problems, notify the transportation
company and Trane do Brasil immediately.
4. The CGAD Cooling units come with
hoisting supports along both sides of the
unit's profile made up of four holes. Put the
hoisting cables through the holes and set
extension bars between the cables on the
top part of the unit (fig. 2). This way, when
the equipment is hoisted correctly, it will
remain in its center of gravity. The loading
weights are shown on table 2.
5. The chains, ropes, or steel cables
should not touch the equipment.
6. During transportation, do not tip or lean
the equipment more than 15° from the
vertical position.
7. The compressors are fixed to their
support tracks with the bolts from the
rubber pads themselves and they leave
the plant tight for protection against
movements that could cause the tubing to
break. The operation and loading position
in this type of pad is the same.
Support and Fastening Base
1. In order to fix the CGAD unit in place,
there must be a support base that is
perfectly level and smooth. Also make sure
that the location for the unit is sufficiently
resistant to withstand its weight and
absorb the vibrations of the unit.
2. We recommend using skids or vibration
arrestors under the unit's support feet. The
rubber pad-type vibration arrestors should
be installed between the unit's feet and the
base surface. If the equipment is installed
on top of cement slab or roof, spring-type
vibration arrestors should be purchased.
We do not recommend the use of shock
absorbers of springs vibration.
3. Mark the support points on the flooring
and be careful when moving the unit
horizontally and vertically.
Transportation
and Movement
U-Beam 3” x 1 1/2” x 0.25” x 100”
Fig. 02 - Fastening the compressor
Fig. 03 - Transportation and movement instruction
CONDENSER
COIL
COMPRESSORS
ELECTRICAL
PANEL
PRESSURE
GAUGES
Model Dimension "A"
020 57''
025-030 71''
040-090 78,8'
Working
height
Base
Compressor

CGAD-SVN02C-EN 9
Clearances for Maintenance
and Air Circulation
For the equipment's good operation, it
is very important to leave enough room
between the units and between the
Fig. 04 - Maintenance and Air Circulation Clearances
NOTE:
Unit: mm
units and the walls in order to allow a
good air circulation without the danger
of hot air returning to the equipment
(air short-circuit). Also read the section
called "Application Considerations" in
this manual.

CGAD-SVN02C-EN10
Clearance between Units and
Sound Pressure (dBA)
Make sure that there is enough space
around the unit externally in order to allow
the installation and maintenance team to
have unrestricted access to all service
points. Check the unit's dimensions in the
drawings that were approved. We
recommend a minimum of 4 feet (1.2 m)
for servicing the compressor. Make sure
there is enough space to open the control
panel doors. Above all, any local codes that
determine additional spaces needed have
priority over these recommendations.
The warm air recirculation and the
depletion of the coil cause a reduction in
the unit's efficiency and capacity due to an
increase in the charge pressures. Do not
allow residues, trash, and other materials
to accumulate around the unit. The
Fig. 05b - Recommended clearances - between units
Fig. 05a - Recommended clearances - horizontal assembly
CGA D020C 64
CGA D025C 65
CGA D030C 65
CGA D040C 67
CGA D050C 68
CGA D060C 68
CGA D070C 70
CGA D080C 72
CGA D090C 72
CGA D100C 72
CGA D120C 74
CGA D150C 74
Pr es s ão Sonora
(dbA) a 10 m e tr os
Equipam e nto
Notes: Measurements are made on the side of
equipment at distance of 10 meters. Measurements
smaller than 10 meters may provide diferents results
because the large size of equipment and different
sources of noise located in defferent positions.
movement of air supply can cause
residues to be sucked up into the
condenser coil and block the spaces
between the fins of the coil and cause the
coil to become depleted. The units for low
ambient temperatures need special
attention. The coils of the condensers and
the discharge of the fans should be kept
free of snow and of other obstructions to
allow an adequate air flow and a
satisfactory operation.
In situations in which the equipment has to
be installed with less space than that
recommended, which frequently occurs in
applications with retroactive updates and
with ceiling assemblies, a restricted air
flow is common.
An unobstructed air flow for the condenser
is essential to maintain the chiller's
operational capacity and efficiency. When
deciding on the unit's position, plan
carefully in order to ensure enough air flow
through the condenser's heat transfer
surface. Two possible harmful conditions
must be avoided for the equipment to
reach its optimum performance: warm air
recirculation and the depletion of the coil.
Warm air recirculation occurs when the
discharge air from the condenser fans is
blown to the entrance of the condenser
coil. The coil's depletion occurs when the
free air-flow (or part of it) to the condenser
is restricted.

CGAD-SVN02C-EN 11
Application Considerations
Certain application restrictions should be
taken into consideration as for the size,
selection, and installation of the CGAD
liquid chillers with air condensation from
Trane. The reliability of the unit and system
many times depends on the appropriate
and complete agreement with these
conditions. Applications that vary from the
guidelines given must be reviewed by your
local Trane engineer.
Dimensioning of the Unit
The unit's capacities are listed in the
section of performance data. To
intentionally overdimension a unit to
ensure adequate capacity is not
recommended. The excess in calculating
the capacity of the system and
compressor has a direct result of an
overdimensioned liquid chiller.
Furthermore, an overdimensioned unit is
normally more expensive to purchase,
install, and operate. If overdimensioning is
desired, consider using two units.
Installing the Unit
Adjusting the Unit
A base or foundation is not necessary if the
location selected for the unit is level and
solid enough to withstand the unit's
operational weight, which is listed in the
table of general data (operational weight).
Insulation and Noise Emission
The most effective way to provide
insulation is to put the unit far away from
any sound-sensitive area. Noise
transmitted structurally can be reduced by
eliminating vibrations. Spring insulators
have shown to be not very effective in
installations with CGAD liquid chillers with
air condensation and we do not
recommend them.
An engineer specialized in this area
should be called upon for advice with
critical sound level applications.
For a maximum insulation effect, water
lines and electric ducts should also be
insulated. Sleeves for the passing of tubes
through walls and king posts of insulated
tubing with rubber can be used to reduce
the noise transmitted by the water tubing.
In order to reduce the noise transmitted
through electric ducts, use flexible ducts.
State and local laws about noise emission
must always be taken into consideration.
Since the environment in which a noise
source is located affects the sound
pressure, where the unit is placed should
be carefully evaluated.
Maintenance
Adequate clearance for maintenance on
the evaporator and the compressor must
be provided. The minimum space
recommended for maintenance may be
found in the section of dimensional data
and it can serve as guidelines to provide
adequate clearance. The minimum space
also gives enough room to open the
control panel and to carry out routine
maintenance.
Location of the Unit
General
An unobstructed air flow in the condenser
is essential to maintain the liquid chiller's
operational capacity and efficiency. When
deciding where to put the unit, some
careful considerations should be taken
into account in order to ensure enough air
flow through the condenser's heat transfer
Application
Considerations
surface. Two conditions may occur that
must be avoided if optimum performance
is going to be reached: short circuit of hot
air and scarcity of air circulation in the coil.
The short circuiting of hot air occurs when
the air flow from the condenser fans is
blown to the entrance of the condenser's
coil caused by some restriction in the
place of installation.
The lack of air circulation on the coil occurs
when the free air flow to the condenser coil
is restricted. Both the short circuiting of hot
air as well as the lack of free air flow
around the coil cause reductions in the
unit's efficiency and capacity due to the
high discharge pressures associated with
these.

CGAD-SVN02C-EN12
Providing Vertical Clearance
The vertical discharge of air from the
condenser should be unobstructed.
Though it is difficult to foresee the level of
hot air short circuiting, a unit installed as
shown above (first, to the right) would have
its capacity and efficiency significantly
reduced. The performance data is based
on the free discharge of air.
Providing Side Clearance
The entrance of the condenser coil should
not be obstructed. A unit installed closer
than the minimum distance
recommended for a wall or other vertical
elevation can undergo a combination of
lack of circulation of free air and warm air
recirculation, which would result in the
reduction of the unit's capacity and
efficiency. The recommended side
clearances are described in the section on
dimensional data. These are estimates
and should be reviewed with Trane's
engineer assigned to the site.
Providing enough Clearance between the
Equipment
The units should be separated one from
the other by a distance that is enough to
prevent short circuiting of hot air or lack of
circulation of free air through the coil. The
CGAD liquid chillers with air condensation
have one of the smallest clearances
recommended for equipment of its
category on the market. Check with Trane's
engineer assigned to your site for
applications dealing with tight clearances
and restricted air flows.
Installation in a Place Surrounded by
Walls
When the unit is installed in a place closed
in or with a small depression, the height of
the fans cannot be lower than the top of the
closed-in area or depression. If they are
lower, the installation of duct work at the top
of the unit should be considered. The
installation of duct work on individual fans,
however, is not recommended. These
applications should always be reviewed by
Trane's engineer assigned to the site.
Application
Considerations
Fig. 06 - Recommended clearances

CGAD-SVN02C-EN 13
Application
Considerations
Water Treatment
Dirt, pebbles, corrosive products, and other
foreign matter will affect the heat transfer
between the water and the components of
the system. Foreign matter in the chilled
water system can also cause a pressure
drop and consequently reduce the flow of
water. Appropriate water treatment should
be determined at the location depending
on the type of system and local water
characteristics. It is not recommended to
use salt water in the CGAD liquid chillers
with air condensation. This would cause
the equipment's durability to decrease
considerably. Trane suggests using a
water treatment specialist familiarized with
the local water conditions to provide
consulting services for this decision and
establish an appropriate water treatment
program. The capacities given in the
section of performance data in this catalog
are based on water with an encrustation
factor of 0.00025. For capacities in other
encrustation factors, check with a Trane
engineer.
Effect of Altitude
on the Capacity
The capacity of the CGAD liquid chillers
with air condensation stated on the table of
performance data is considering
installation at sea level. In elevations
substantially above sea level, the lower air
density will lower the condenser's capacity
and therefore, the capacity and efficiency of
the entire unit. The adjustment factors for
table 2 may be applied directly to the
performance data of the catalog in order to
determine the unit's adjusted
performance.
Limitations of the Room
The CGAD liquid chillers with air
condensation offered by Trane were
designed for high durability under various
room conditions. The 20 to 150 TR liquid
chillers operate with temperatures
between 0oC to 45oC as standard. For
operation outside of these ranges, please
contact Trane's local sales office. The
minimum room temperatures are based
on soft breezes (not exceeding 8 km/h).
Higher wind speeds will result in a drop of
discharge pressure and therefore
increase the minimum ambient
temperature of operation and start.
Water Flow Limits
The minimum water flow rates are stated
on table 1 and a flow of the evaporator
below the levels on the table will result in a
drift causing problems of freezing,
encrustation, accumulation of impurities,
and temperature control problems. The
water flow of the evaporator is also given in
the section of general information. Flows
exceeding those listed may result in
excessive erosion of the tube. The
evaporator can resist a reduction of up to
50% of the water flow as long as this flow
is the same or greater than the minimal
requirements.
Temperature Limits
Variation of Leaving Water Temperature
The CGAD liquid chillers with air
condensation offered by Trane have three
distinct water output categories: standard,
low temperature, and ice making. The
standard variation of leaving water
temperature is 4 to 15oC. Machines of low
temperatures produce leaving water
temperatures between -18 and 4oC. Since
adjustment points of the water supply
temperature between -18 and 4oC result in
suction temperatures equal to or lower
than the water freezing point, a glycol
solution is needed for all the low-
temperature machines.
Ice making machines have a variation of
leaving water temperature between -7 and
15oC. Ice making controls include a
double adjustment point for controlling and
protecting the ice making capacity and
standard refrigeration. Check with Trane's
engineer assigned to your site for
applications or selections that have to do
with low temperature or ice making
machines (special order).
The maximum water temperature that can
be circulated through an evaporator while
the unit is on is 42oC. The evaporator
becomes limited due to the thermal stress
at this temperature.
Drop in Temperature
of the Entering Water
The performance data for Trane's CGAD
liquid chillers with air condensation are
based on a drop of chilled water
temperature of 5.5oC. Drops in
temperature outside of this variation will
result in a performance of the unit that
differs from those in the catalog. For
performance data outside of the variation of
5.5oC, check with a Trane engineer before
making your choice. Drops in chilled water
temperature from 3.3 to 10oC may be used
as long as the minimum and maximum
temperatures of water and minimum and
maximum flow rates are not violated.
Drops in temperature beyond 3.3 to 10oC
are not within the optimum variation for
control.
Furthermore, drops in temperature of less
than 3.3oC may result in inadequate
superheat of the refrigerant. Calibrated
superheat is always one of the first
concerns in any direct spread system and
it is especially important in liquid chiller
equipment where the evaporator is
connected to the compressor. When the
drop in temperature is less than 3.3oC, it
may be necessary to bypass part of the
entering water directly into the tubing of the
evaporator's leaving water.
Pressure from the side of Disarmament
Lower Pressure
The values of disarmament to the side of
low pressure adjusted at the factory are:
-- R407C: 25 psig.

CGAD-SVN02C-EN14
Application
Considerations
Typical Water Piping
All the water pipes in the building should
be clean before making the final
connections with the liquid chiller. In order
to reduce heat loss and prevent
condensation, insulation should be
installed. Normally expansion tanks are
also needed so that changes in the chilled
water volume can be accommodated.
Operation in Series
Some systems require large drops in
chilled water temperature (8.8 to 13.3oC).
For these installations, two units are
needed with their evaporators in series.
The control of the units should begin with
the single temperature controller in order to
keep the separate thermostats from
opposing each other in a single "take". It is
possible to control the units from the
individual controls of the units, but a single
temperature controller provides a positive
method for preventing the overlapping of
controls, it balances the system's load
more appropriately, and simplifies the lead-
lag capacity for the compressor.
Parallel Operation
Some systems ask for more capacity or
reserve capacity that a simple machine can
offer. For these installations, two units with
their evaporators in a parallel configuration
are common. A single effective method of
controlling two units in parallel is with a
single temperature controller. Two
individual temperature controls are not
capable of providing a reliable control of the
system and will result in an unsatisfactory
operation and possible failure in the
compressor.
Water Circuit that is too Small
The appropriate localization of the
temperature control sensor is at the water
supply (outlet). This location makes it so
that the building serves as a kind of buffer
and ensures a slow changeover in the
return water temperature. If there is not a
sufficiently large enough water volume in
the system to supply an adequate buffer,
the temperature control may be lost,
resulting in a subdimensioning of the
liquid chiller. A water circuit that is too small
has the same effect of trying to control the
system from the return water point forward.
Minimal water volume is given by following
equation
Minimal Volume = GPM x 3 filling time
GPM = Gallons per minute
As a general guideline, a tank must be
added to system if the volume of water is
too low. Make sure that the water volume in
the evaporator's circuit is equal to or two
times greater than the evaporator's flow.
For a quick change in the charge profile,
the volume should be increased. In order
to avoid the effects of a water circuit that is
too small, special attention should be
given to the following items: A storage tank
or a large pipe to increase the volume of
water in the system and this way reduce
the temperature changeover rate of the
return water.
Operation of Multiple Units
Whenever two or more units are used in a
chilled water circuit, Trane recommends
that their operations be controlled by a
single control device.
Height Capacity Consumption Water Flow
01.000 1.000 1.000
500 997 1.012 997
1000 994 1.024 994
1500 991 1.037 991
2000 987 1.052 987
2500 983 1.067 983
3000 978 1.084 978
Recomended de
Etileno Glicol %
°F
°C
40
4,4
0
39
3,9
3
38
3,3
6
37
2,8
8
36
2,2
10
35
1,7
12
34
1,1
14
33
0,6
15
32
0,0
17
31
-0,6
19
30
-1,1
20
29
-1,7
21
28
-2,2
23
27
-2,8
25
26
-3,3
26
Water Outlet
Temperature
Tab. 03 - Recomended de Etileno Glicol %
Tab. 02 - Height Correctors Factors

CGAD-SVN02C-EN 15
Application
Considerations
Components of the Hydraulic Tubing of
the Evaporator
The figure below shows how to proceed to
install the water tubing. An air escape valve
is placed on the top part of the evaporator
and leaving water. Provide additional air
escape valves at the highest points of the
tubing in order eliminate it from the chilled
water system.
Drain of the Evaporator
The evaporator discharge connection
should be close to an available drain in
order to empty out the evaporator even
during the service. Install a slide valve on
the drain line.
Thermometers and Pressure Gauges
The installation of thermometers (items 5
and 12 of the figure) and pressure gauges
(item 9) is essential at the inlet and outlet
of chilled water. These instruments should
be installed close to the unit and have the
maximum scale of 1oC for thermometers
and of 0.1 kg/cm2for pressure gauges.
Important: In order to avoid damaging the
evaporator, do not let the water pressure
exceed 150 psig.
We recommend installing a pressure
gauge with a connection at the water inlet
and outlet similar to item 9 in the figure in
order to avoid reading errors. The
installation of the pressure gauges and
thermometers should be at a height to
avoid parallax errors*. The thermometers
should also be of glass or mercury
scaling with colored fluid for contrast
purposes and to make reading them
easier.
- The pressure gauges should be
designed with siphons.
- Install slide valves in order to isolate the
pressure gauges when they are not being
used.
Use joints on the tubing in order to
facilitate the mounting and dismounting
services.
The inlet and outlet should have slide
valves in order to insolate the evaporator
during the execution of services and a
globe valve at the outlet to regulate the flow
of water.
Flow-Switch
Check the safety interlocking, especially
the flow-switch should be installed along
straight and horizontal sections with the
fins according to the diameter of the tubing
and the distance of the curves and valves
at least five times its diameter on each
side.
Water Treatment
The use of untreated or poorly treated
water could result in the formation of
scales, erosion, corrosion, algae, and
lime. We recommend that the services of a
water treatment specialist be contracted in
order to determine the treatment and if
needed, to carry it out. Trane do Brasil
does not take any responsibility for failures
with equipment due to using untreated or
poorly treated water.
* Parallax Error: Apparent dislocation of an object when the point of observation is changed. This especially refers to the apparent dislocation of the needle of a measuring instrument when looking at it
from a vertical direction (parallax error).
Fig. 07 - Components of the Hydraulic Tubing of the Evaporator

CGAD-SVN02C-EN16
Checklist for Initial Start
General
Once the units are installed, complete
each item of this list. When they are all
complete, the units will be ready for starting
up.
[ ] Make sure that the installation voltage is
the same as the CGAD liquid chiller and
other components.
[ ] Inspect all the electric connections. They
should be clean and tight.
[ ] Check the oil level in the crankcase of
the compressors. The oil should be visible
in the oil-level sight glass.
[ ] Check the sequence of the phases as
described in the power supply drawings.
[ ] Check the correct installation of all the
temperature sensors.
[ ] Close the unit's power disconnect
switch and the command circuit breakers.
The switch for the CGAD liquid chiller unit
should be in the OFF position.
[ ] Complete the chilled water circuit
(evaporator). Read also the "Water
System" of the evaporator in this manual.
[ ] Close the circuit breakers or
disconnecting switches with fuses that
provide energy to the starting switches of
the chilled water pump.
[ ] Turn on the chilled water pump. With the
water circulating, check all the tubing
connections in order to detect possible
leaks. Make any repairs that may be
needed.
[ ] With the water pump on, adjust the
water flow, and check the loss of pressure
through the evaporator. Write down the
Checklist
for Initial Start
WARNING!!
In order to prevent accidents or deaths
from electric shocks, open and lock in
place all the circuit breakers and electric
disconnects.
WARNING!!
In order to avoid damaging the
compressors, do not operate the unit
with any of the access valves of suction,
discharge, or liquid while they are closed.
levels obtained.
[ ] Adjust the water flow switch on the
chilled water tubing and make sure that it
is working correctly.
[ ] Turn off the pumps. The unit is ready to
start up. Follow the instructions of
operation, maintenance, and
complementary procedures for starting up
the unit.
Check the procedures in this manual to
complete the gas charge.
CAUTION:!
In order to avoid superheat, the
connectionsand low voltage conditions
in the compressor motor, make sure that
all theconnections are tighton the
compressor's electrical circuit.
[ ] Loosen the bolts of the rubber pads on
each compressor if this has not been
done yet.
[ ] Open the valves of the lines of suction,
liquid, and the service valve of discharge.
[ ] Make sure that there are no refrigerant
leaks.
[ ] Check the voltage (energy supply) for the
unit at the disconnect switch and power
fuses. The voltage should be within the
ranges stated on tables 10 and 11 (as well
as printed on the equipment's identification
plates). The voltage unbalance should not
exceed 2% - check page 30 of this
manual.
CAUTION:!
In order to avoid damaging the
equipment, don'tuse untreated orpoorly
treated water in the system. The use of
inappropriate water will result in the
equipment losing its warranty.
Rated Voltage
Operation Range(V)
220V/60Hz
180-253
380V/60Hz
342-418
440V/60Hz
414-506
380V/50 Hz
340-440

CGAD-SVN02C-EN 17
refrigerant into the atmosphere.
[ ] Fill out the "Start-up Sheet" that comes
with the equipment.
Once the unit is operating normally,
keep the machine house clean and the
tools in place. Make sure that the
doors of the control panels are in
place.
New regulationSuperheat of the
New regulation
The normal superheat for each circuit is
5°C to 10°C at full charge. If the superheat
is not within this range, adjust the
calibration of the superheat of the
expansion valve. Allow 5 to 10 minutes
between the adjustments to give time for
the expansion valve to stabilize after each
new adjustment.
Sub-cooling System
The normal sub-cooling each circuit is 6 °
C to 12 ° C at full load. If the sub-cooling
isn’t in this range, check the circuit
overheating and adjust if necessary.
Operational Conditions
Once the unit has been operating for
approximately 10 minutes and the
system is stabilized, check the
operational conditions and complete
the following checklist of procedures:
[ ] Check once again the flow of water
and the drops of pressure through the
evaporator and the condenser. These
readings should be stable and at
appropriate levels. If the differential
pressure drops, clean all the water
supply filters.
[ ] Check the suction and discharge
pressures in the unit's pressure
gauges.
Pressures
Take a reading of the discharge
pressure at the connection of the
service valve seat. The suction
pressure levels at the Schrader valve
on the suction line should be as
follows:
Normal pressure levels
Pressures Normal Values
Discharge 200 to 360 psig
[ ] Check the oil level in the compressors.
At full charge, the oil level should be visible
at the compressor's oil sight glass. If not,
add or remove oil as needed. See table 04
for a list of the types of oil recommended
and the correct amounts for the units.
[ ] Check and record the amperage
consumed by the compressor. Compare
the readings with the compressor's
electrical information shown on its plate.
[ ] Check the liquid sight glass. The flow of
refrigerant should be clean. Bubbles in the
liquid indicate a low charge of refrigerant or
excessive loss of pressure on the liquid
line.
A restriction can frequently be identified by
a notable difference in temperature
between one side and another of the
restricted area. Frequently ice forms at the
outlet of the liquid line at this point too.
Check table XX in this manual.
[ ] Once the oil level, the amperage,
and the operational pressures are
stabilized, measure the superheat.
Read the section on superheat and
subcooling in this manual.
[ ] Measure the subcooling. Read the
section on superheat and subcooling
in this manual.
[ ] If the operational pressure, liquid
sight glass, the superheat, and the
subcooling indicate a lack of
refrigerant gas, add gas to each
circuit. The lack of refrigerant is
indicated if the work pressures are low
and the subcooling is also low.
[ ] Add refrigerant gas (only in the gas
form) with the unit in operation by
adding a gas charge at the Schrader
valve situated on the suction line until
the operational conditions have
normalized.
[ ] If the operational conditions indicate an
overcharge of gas, then slowly remove
refrigerant through the service valve
located on the liquid line. Do not discharge
Operational
Conditions
WARNING!!
CAUTION:!
In order to minimize the use of the
pressure gauges, close the valves in
order to isolate them after their use.
CAUTION:!
The system maynot have the right
charge of refrigerant even though the
liquid sight glass is clean. Superheat,
subcooling,and operational pressures
mustalso be taken into consideration.
CAUTION:!
If the suction and discharge pressures
are low but the subcooling is normal,
there is no lack of refrigerant gas. To add
gas would result in overcharge.
CAUTION:!
In order to avoid damaging the compres-
sor and ensure full cooling capacity,only
use the refrigerant that is specified on
the equipment's identification plate.
CAUTION:!
In order to avoid damaging the
compressors, do not allow the
refrigerantliquid to get into the suction
line.
In order to avoid injuries from freezing, do
not have direct contact with the
refrigerant.

CGAD-SVN02C-EN18
Operational
Conditions
Fig.08 - Resistance of crankcase
Recommended for position fixing
Crankcase Resistance
Trane recommends the use of crankcase
when the load of the system refrigerant
load exceeds the refrigerant compressor
limit (RCL). The needs of crankcase
resistance are directly related to the
possibility of liquid migration to the
compressor, and consequently causing
poor lubrication of it. Migration can occur
during long periods of compressor
shutdown (over 8 hours). The crankcase
resistance is recommended to eliminate
the liquid migration when these downtime
long periods.The crankcase resistance
must be installed on the compressor
housing and below the removal oil point.
The crankcase resistance must remain
energized while the compressor is off.
Attention:
The strength of crankcase must be
energized at least 12 hours before the
startup of the compressor (with the service
valves open) and should be maintained
until the compressor energized startup.
!
This will prevent the dilution of oil and the
bearings overload in the initial compressor
starts. When the compressor is off, the
crankcase temperature should be kept at
least 10°C above the refrigerant
temperature in the suction side (low
pressure side). This requirement ensures
that the refrigerant will not be retained in
the compressor crankcase. Tests can be
done to ensure that the appropriate
temperature of the oil is maintained below
the ambient conditions (temperature and
wind).
Therefore, for a temperature below -5°C
and an over 5m/s wind speed, it is
recommended that the resistors be
thermally isolated to limit the energy loss to
the environment.
Notes:
1)oilload, refers tothe total filed replacement.
2)In retrofit or maintenanceprocedures, the ideal is that there is no mineral oil andsynthetic oil mixture! The maximum percentage ofmixture of mineral andsynthetic oil is 5%.For example, fora retrofit operation ofR407C,
when the chillerwill beloaded with 20 liters of syntheticoilwill be tolerate in thesystem up to 1 literof mineral oil. It applies the same rule in theconversion ofsyntheticoilformineral oil.
IMPORTANT
Temperatures
Superheating 5° C to 10°C
Subcooling 6° C to 12° C
Table 04 - load and Refrigerant Oil
RECOMMENDATION
The oil recommended by Trane do Brasil
to be used on the CGAD units is TRANE
OIL 48.
M ODEL REFRIG. OLEO RECOM M ENDED COM PR.1 CA RGO REFRIG.(Kg) C ARGO OLEO (L) COM P R.2 CARGO REFR IG.(Kg) CARGO OLEO (L)
CGAD020 R407C TRANE OIL-00048 ou DANFOSS 160SZ 2xSZ125 18,5 7,6
CGAD025 R407C TRANE OIL-00048 ou DANFOSS 160SZ SZ125/SZ185 22,0 10,0
CGAD030 R407C TRANE OIL-00048 ou DANFOSS 160SZ 2xSZ185 24,0 12,4
CGAD040 R407C TRANE OIL-00048 ou DANFOSS160SZ 2xSZ125 18,0 7,6 2xSZ125 18,0 7,6
CGAD050 R407C TRANE OIL-00048 ou DANFOSS 160SZ SZ125/SZ185 22,5 10,0 SZ125/SZ185 22,5 10,0
CGAD060 R407C TRANE OIL-00048 ou DANFOSS 160SZ 2xSZ185 27,0 12,4 2xSZ185 27,0 12,4
CGAD070 R407C TRANE OIL-00048 ou DANFOSS160SZ 2xSZ125+SZ185 31,5 13,8 2xSZ125+SZ185 31,5 13,8
CGAD080 R407C TRANE OIL-00048 ou DANFOSS 160SZ 2xSZ185+SZ125 36,0 16,2 2xSZ185+SZ125 36,0 16,2
CGAD090 R407C TRANE OIL-00048 ou DANFOSS 160SZ 3xSZ185 40,5 18,6 3xSZ185 40,5 18,6
CGAD100 R407C TRANEOIL-00048 ou DANFOSS 320 SZ 2 xSY300 41,0 17,5 2 x SY300 41,0 17,5
CGAD120 R407C TRANEOIL-00048 ou DANFOSS 320 SZ 3 xSY240 66,0 26,0 3 xSY240 66,0 26,0
CGAD150 R407C TRANEOIL-00048 ou DANFOSS 320 SZ 3 xSY300 66,0 26,0 3 xSY300 66,0 26,0
CGAD100 R407C COPELAND 3MAF (*) 2XZR300KCE 41,0 11,2 2XZR300KCE 41,0 11,2
CGAD100 R407C COPELAND 3MAF (*) 2XZR310KCE 41,0 11,2 2XZR310KCE 41,0 11,2
CGAD120 R407C COPELAND 3MAF (*) 3XZR250KCE 66,0 13,2 3XZR250KCE 66,0 13,2
CGAD150 R407C COPELAND 3MAF (*) 3XZR300KCE 66,0 16,8 3XZR300KCE 66,0 16,8
CGAD150 R407C COPELAND 3MAF (*) 3XZR310KCE 66,0 16,8 3XZR310KCE 66,0 16,8
CIRCUIT 01 CIRCUIT 02

CGAD-SVN02C-EN 19
Calculating Subcooling
and Superheat
Superheat Adjustments
Superheat is checked and adjusted in the
following way:
- In order to analyze the superheat
condition, the surface of the tubing should
be prepared where the temperature
sensor will be connected by sanding the
surface and the fastening area.
- Securely fasten the sensor of a precise
electronic thermometer to the suction line
close to the remote bulb of the thermostatic
expansion valve on the same plane
(Suction Line Temperature - SLT). Insolate
the sensor with adhesive tape in order to
keep out the interference of external
temperatures.
- Open the valve of the low pressure
manometer on the suction side of the
equipment.
- Turn on the system and allow the
temperature shown on the thermometer to
stabilize after the equipment has been on
for a while.
- Convert what is shown on the
manometer into °C, using the saturation
table for R-407C. The difference in
degrees between the thermometer
marking and the saturated evaporating
temperature (SEVT) is the value of
superheat. If superheat is greater than
10°C or less than 6°C, continue with this
step.
SUP = TLS - TEVS
- Remove the lid to the body of the
expansion valve and make the needed
adjustment by turning the calibration rod.
- For superheat greater than 10°C, open
the expansion valve or add refrigerant.
- For superheat less than 6°C, close the
expansion valve or remove refrigerant.
- After the adjustment is made, remove the
sensor of the electronic thermometer and
isolate once again the suction line.
- Close the valve of the manometer for low
pressure.
Subcooling Adjustments
Subcooling is checked and adjusted in the
following way:
- In order to analyze the subcooling
condition, the surface of the tubing should
be prepared where the temperature
sensor will be connected by sanding the
surface and the fastening area.
- Securely fasten the sensor of a precise
electronic thermometer to the liquid line,
10 to 15 cm before the unit's filter dryer on
the same plane (Liquid Line Temperature
- LLT). Insolate the sensor with adhesive
tape in order to keep out the interference of
external temperatures.
- Open the valve of the high pressure
manometer on the side of the
compressor's discharge, if the unit has
one. A more exact reading will be obtained
by measuring the high pressure at the
Schrader valve on the liquid line.
- Turn on the system and allow the
temperature shown on the thermometer to
stabilize after the equipment has been on
for a while.
- Convert what is shown on the
manometer into °C, using the saturation
table for R-407C. The difference in
degrees between the saturated
condensing temperature (SCDT) and the
marking of the electronic thermometer is
the subcooling level. If subcooling is
greater than 10°C or less than 5°C,
continue with this step.
SUB = TCDS - TLL
- Remove the lid of the Schrader valve on
the liquid line close to the solenoid valve
and install a refrigeration hose on the
pressure tap that is equipped with a
bellows valve. If the subcooling is greater
than 10°C, evacuate refrigerant from the
system until the subcooling is calibrated or
open the expansion valve.
- If the subcooling is less than 5°C, charge
refrigerant through the suction valve of the
system's compressor until the ideal
subcooling conditions is reached or close
the expansion valve.
- After the adjustment is made, remove the
sensor of the electronic thermometer that
was previously fixed there.
- Close the valve of the manometer for
high pressure.
WARNING!!
Never put flame to the refrigerant
cylinder to increase its pressure.
Uncontrolled heat may cause an
excessive pressure and an explosion
that could result in injuries, death, and the
damaging of the equipment.
Note:
1. When the subcooling varies 1°C, the
superheat varies 3°C.
2. The thermostatic expansion valve
closes by turning the knob clockwise,
while counterclockwise opens it
CAUTION:!
Do not operate the compressor without
some quantity of refrigerant present in
the circuit. The compressors could be
damaged.
CAUTION:!
1. Weigh the refrigerant cylinder before
and after the charge.
2. Do notallow the refrigerant liquidto get
into the suction line.Liquid in excess
could damage the compressor.
WARNING!!
1. In order to avoid injuries from freezing,
do not have direct contact with the
refrigerant.
2. UsePersonalSafetyEquipmentduring
all procedures.

CGAD-SVN02C-EN20
- A socket wrench set from 7/16" to 11/
4"
- Torque wrench with scaling up to
180 ft/lbf
- 6" and 12" crescent type wrench
- 14" pipe wrench
- Complete Allen wrench set
- Screwdriver set
- Set of pliers: universal, for cutting,
lock grip, and electrical
- Set of tube flanging tools
- Ratchet-spanner for refrigeration
- A set of open-ended wrenches from
1/4" to 1 1/4"
- A set of star wrenches from 1/4" to 9/
16"
Equipment required
- Pressure regulator for nitrogen
- 15 cfm vacuum pump
- Electronic vacuum gauge
- Megohmmeter of 500 volts with
scaling of 0 to 1000 megohms
- Electronic leak detector
- Ammeter pliers
- Complete manifold
- Electronic thermometer
- R-407C refrigerant and Trane Oil 48
- Oxy-acetylene soldering machine
- Temperature-pressure table of the
R-407C.
- Equipment to recycle and recover
refrigerant gas
- Anemometer
- Psychrometer
- Pulley remover
- Manual oil pump
- Phasemeter
Refrigeration
Cycle
Fig. 09 - Flowchart of refrigeration cycle
List of tools and equipment recommended in order to carry out the installation
and services
Tools and Equipment Needed
Suction
temperature
Suction
valve
Pressostato
de Alta
Low pressure
switch
Liquid line
valve
Liquid
temperature
Solenoid
Valve
Liquid sight
glass
Expansion
valve
Evaporator
Condenser
Discharge
valve
Compressor
Drier filter
(optional)
Transducer