Page 1
RAU-SVX01F-E4
Installation
Operation
Maintenance
RAUL
Air Cooled Condensing Unit
Sizes 190 – 260 – 300 – 350 – 400
450 – 500 – 600 – 700 – 800
To be used
with the CH530 control
module manual
Page 2
RAU-SVX01F-E4
General information
Foreword
These instructions are given as a guide
to good practice in the installation,
start-up, operation, and maintenance
by the user, of Trane RAUL. They do
not contain full service procedures
necessary for the continued successful
operation of this equipment. The
services of a qualified technician
should be employed through the
medium of a maintenance contract
with a reputable service company.
Read this manual thoroughly before
unit start-up.
Units are assembled, pressure tested,
dehydrated, charged and run tested
before shipment.
Warnings and cautions
Warnings and Cautions appear at
appropriate sections throughout this
manual. Your personal safety and
the proper operation of this machine
require that you follow them carefully.
The constructor assumes no liability
for installations or servicing performed
by unqualified personnel.
WARNING! : Indicates a potentially
hazardous situation which, if not
avoided, could result in death or
serious injury.
CAUTION! : Indicates a potentially
hazardous situation which, if not
avoided, may result in minor or
moderate injury. It may also be used
to alert against unsafe practices or for
equipment or property-damage-only
accidents.
Safety recommendations
To avoid death, injury, equipment
or property damage, the following
recommendations should be observed
during maintenance and service visits:
1. The maximum allowable pressures
for system leak testing on low and
high pressure side are given in the
chapter «Installation». Always provide
a pressure regulator.
2. Disconnect the main power supply
before any servicing on the unit.
3. Service work on the refrigeration
system and the electrical system
should be carried out only by qualified
and experienced personnel.
Reception
On arrival, inspect the unit before
signing the delivery note.
Reception in France only:
In case of visible damage: The
consignee (or the site representative)
must specify any damage on the
delivery note, legibly sign and date the
delivery note, and the truck driver must
countersign it. The consignee (or the
site representative) must notify Trane
Epinal Operations - Claims team and
send a copy of the delivery note. The
customer (or the site representative)
should send a registered letter to the
last carrier within 3 days of delivery.
Note: for deliveries in France, even
concealed damage must be looked for
at delivery and immediately treated as
visible damage.
Reception in all countries except
France:
In case of concealed damage: The
consignee (or the site representative)
must send a registered letter to the
last carrier within 7 days of delivery,
claiming for the described damage.
A copy of this letter must be sent to
Trane Epinal Operations - Claims team.
Warranty
Warranty is based on the general terms
and conditions of the manufacturer.
The warranty is void if the equipment
is repaired or modified without the
written approval of the manufacturer,
if the operating limits are exceeded or
if the control system or the electrical
wiring is modified. Damage due to
misuse, lack of maintenance or failure
to comply with the manufacturer’s
instructions or recommendations is not
covered by the warranty obligation.
If the user does not conform to the
rules of this manual, it may entail
cancellation of warranty and liabilities
by the manufacturer.
© 2012 Trane
Page 3
RAU-SVX01F-E4
Contents
3
Refrigerant
The refrigerant provided by
the manufacturer meets all the
requirements of our units. When using
recycled or reprocessed refrigerant,
it is advisable to ensure its quality is
equivalent to that of a new refrigerant.
For this, it is necessary to have a
precise analysis made by a specialized
laboratory. If this condition is not
respected, the manufacturer warranty
could be cancelled.
Environmental Protection /
Compliance with F-Gas
regulation
This equipment contains a fluorinated
gas covered by the Kyoto Protocol [or
an ozone depleting substance covered
by Montreal Protocol].The type and
quantity of refrigerant per circuit is
indicated on the product nameplate.
The Global Warming Potential of the
refrigerant implemented in Trane
Air Conditioning and Refrigeration
Equipment is presented in the table by
type of refrigerant.
Refrigerant type GWP (1) value
R134a 1 300
R407C 1 653
The operator (contractor or
end user) must check local
environmental regulations impacting
installation, operation and disposal
of the equipment; in particular
need to recover environmentally
harmful substances (refrigerant, oil,
antifreeze agents, etc.) Do not vent
into the atmosphere any refrigerant.
The handling of refrigerant shall
be fulfilled by a qualified service
engineer.
(1) GWP = global warming potential
Maintenance contract
It is strongly recommended that you
sign a maintenance contract with your
local Service Agency. This contract
provides regular maintenance of
your installation by a specialist in
our equipment. Regular maintenance
ensures that any malfunction is
detected and corrected in good time
and minimizes the possibility that
serious damage will occur. Finally,
regular maintenance ensures the
maximum operating life of your
equipment. We would remind you that
failure to respect these installation
and maintenance instructions may
result in immediate cancellation of the
warranty.
Training
To assist you in obtaining the best
use of it and maintaining it in perfect
operating condition over a long
period of time, the manufacturer
has at your disposal a refrigeration
and air conditioning service school.
The principal aim of this is to give
operators and technicians a better
knowledge of the equipment they are
using, or that is under their charge.
Emphasis is particularly given to
the importance of periodic checks
on the unit operating parameters as
well as on preventive maintenance,
which reduces the cost of owning the
unit by avoiding serious and costly
breakdown.
Page 4
4 RAU-SVX01F-E4
Contents
General information 2
Installation 5
Unit nameplate 5
Installation instructions 5
Handling 5
Refrigerant lines 6
Refrigerant charge 7
Oil charge 7
Electrical connections 10
Temperature sensor 10
Hot gas-bypass control (option) 10
Capacity control modes 11
General start-up 12
Start-up Preparation 12
Start-up 12
Operation 14
Control System 14
Unit operations 14
Week end shutdown 14
Seasonal shutdown 14
Seasonal start-up 14
Maintenance 15
Maintenance instructions 15
Installation checklist 16
Troubleshooting guide 17
Performance data 20
Page 5
5RAU-SVX01F-E4
Installation
For minimum clearance, consult
the certified submittals, which are
available on request from your Trane
Sales Office.
Unit nameplate
The unit nameplate gives the
complete model reference numbers.
The unit power rating is shown, and
power supplies should not deviate by
more than 5 % from the rated power.
Compressor motor amperage is
shown in box I.MAX.
The customer’s electrical installation
must be able to withstand this
current.
Installation instructions
Foundations
No special foundations are required,
provided the supporting surface is
flat and level, and can withstand the
weight or the unit.
Anti-vibration rubber pads
They are supplied as standard with
the machine, and should be placed
between the supporting floor and the
unit to attenuate vibrations.
- 4 pads for the sizes 190 to 300
- 6 pads for the sizes 350 to 800
- Trane does not allow the
installation of spring isolators.
Clearance
Respect recommended clearance
around the unit to allow
maintenance operation to take
place without obstruction and
recommended clearance around
condenser.
CAUTION! Unit operation depends
on the air temperature. Any recycling
of the air fed out by the fans will
increase the air intake temperature
over the condenser fins and can
result in high pressure cut-out.
In this case the standard operating
conditions are modified.
Operation of the unit may be
affected by an increase in air
temperature on the condenser.
When the units are positioned in a
windy area, avoid all the risks of aircooled recycling.
See submittals
Handling
Note:
The plates welded at the end of the
bases must not be used for handling.
Figure 1 - Handling
A
B
Table 1 - Dimensions of recommended slings and swing-bar:
190 260 300 350 400 450 500 600 700 800
A (mm) 1500 1500 1500 1500 1500 1500 2400 2400 2300 2300
B (mm) 1800 1800 1800 1800 1800 1800 1800 1800 2200 2200
Weight - crated
(kg) 555 625 691 869 959 985 1123 1251 1695 1754
Page 6
6 RAU-SVX01F-E4
Installation
Discharge lines
Discharge lines should be calculated
to obtain the gas displacement
speed in horizontal and vertical lines
required to drive compressor oil.
Determine diameter of discharge
lines as per the following criteria.
1. Speed above 2.5 m/s horizontally.
(Consider minimum speed at
minimum load)
2. Speed above 5.0 m/s vertically
(Vertical risers, consider speed at
minimum load)
3. Maximum speed 20 m/s.
4. Horizontal pipe run must be
pitched of 1cm/m in the same
direction as the refrigerant
circulation
5. An oil trap is necessary for vertical
risers greater than 3m. For major
elevations add an intermediate oil
trap every 5m.
6. Maximum pressure drop between
20 to 50 kPa
7. Install a filter drier adapted to
refrigerant capacity.
Insulation of refrigerant lines
Insulate refrigerant lines from
building itself to avoid transmission
to building structure of vibrations
normally caused by pipework.
Also avoid bypassing the unit’s
damping system by fixing the
refrigerant lines or the electrical
ducts very rigidly.Vibrations may
propagate into building structure
through rigidly fixed refrigerant lines.
Refrigerant lines
Figure 2 - Refrigerant flow chart
1 = Compressor
2 = Condenser coil
3 = Subcooler coil
4 = Schraeder valve
5 = Coil header
6 = Relief valve
7 = High pressure switch
8 = Low pressure transducer
9 = High pressure transducer
10 = Stop valve
Calculating and fixing the capacity
of refrigerant lines is necessary
to assure the oil return to the
compressor, avoid refrigerant phase
changes and limit pressure drop.
Liquid lines
Calculate capacity of liquid line, as
per the following criteria.
1. Maximum load operating
conditions.
2. To avoid any evaporation risk:
- Consider the vertical risers
- Maximum pressure drop must not
exceed 1 to 2°C
3. Liquid circulation speed in a 0.5 to
2m/s range.
Pressure tests. Leak detection
During operations, take the following
precaution:
1. Neither oxygen nor acethylene
should be used instead of
refrigerant and nitrogen to
detect leaks, otherwise a violent
explosion may occur.
2. Always use valves and
manometers to check the test
pressure in system. Excessive
pressure may either cause pipes
to rupture, damage unit, or cause
an explosion, causing possible
physical injury.
Carry out liquid line and hot gas line
pressure tests in accordance with
current standards.
The test pressures applied to the
liquid line and the hot gas suction
line must comply with the country’s
standards.
Caution: Do not go more than 0.7
bar above the high pressure switch
setpoint.
Page 7
7RAU-SVX01F-E4
Installation
Introduce enough refrigerant into
circuit in order to obtain a pressure
of 85 to 100 kPa. Search for possible
leaks using detector. This operation
should be carried out with great care
throughout the system.
If leaks are detected, pump down
the refrigerant, and repair defective
component. Repeat test process, to
check that the repair can withstand
rated pressure.
Refrigerant charge
(all split system types)
Units ship with a nitrogen holding
charge and isolating valves.
After system pressure and vacuum
testing, fill up unit with refrigerant.
The refrigerant complement will be
charged according to the diameter
and the length of the refrigerant
piping work up to obtain the
correct superheat and subcooling
temperatures.
Oil charge
The oil quantity necessary for the
split system has also to be adjusted
according to the diameter and the
length of the refrigerant piping work.
Important note: These operations
have to be performed by a specialist
according to the rules of the art. The
results have to be written on a start
up record by the Trane engineer
or the client’s specialist who has
performed this start up. The quantity
of refrigerant and oil added are at the
client’s charges.
Page 8
8 RAU-SVX01F-E4
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Table 3 - R407C General data
RAU 190 RAU 260 RAU 300 RAU 350 RAU 400 RAU 450 RAU 500 RAU 600 RAU 700 RAU 800
R407C R407C R407C R407C R407C R407C R407C R407C R407C R407C
Performances (1)
Gross cooling capacity (1) (kW) 54.8 66.6 81.1 95.3 108.3 118.8 133.0 162.0 194.7 218.8
Power input in cooling (1) (kW) 16.7 23.6 28.2 31.0 36.1 43.2 48.7 57.9 61.8 74.6
Main Power supply 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50
Sound Power Level (5) (dB(A)) 88 90 91 91 92 93 93 94 98 98
Units
Amps
Nominal (4) (A) 41.3 50.1 59.0 70.3 79.1 88.0 99.3 117.0 150.4 168.1
Start-up Amps (A) 144 199 207 219 228 236 248 265 299 316
Max supply cable size (mm2) 35 35 35 50 50 95 95 95 150 150
Compressor
Number 2 2 2 3 3 3 4 4 6 6
Type Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll
Model 10T+10T 10T+15T 2x15T 10+10T- 15T 10T+15T - 15T 15T+15T - 15T 2x(10T+15T) 2 x (15T+15T) 2x(10T+10T+15T) 2x(10T+15T+15T)
Number of speeds 1 1 1 1 1 1 1 1 1 1
Number of motors C1 / C2 2 2 2 2 / 1 2 / 1 2 / 1 2 / 2 2 / 2 3 / 3 3 / 3
Rated Amps (2)(4) (A) 17.7 17.7 / 26.6 26.6 17.7 / 26.6 17.7 / 26.6 26.6 17.7 / 26.6 26.6 17.7 / 26.6 17.7 / 26.6
Locked rotor Amps (2) (A) 120 120 / 175 175 120 / 175 120 / 175 175 120 / 175 175 120 / 175 120 / 175
Motor RPM (rpm) 2900 2900 2900 2900 2900 2900 2900 2900 2900 2900
Sump Heater (2) (W) 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V
Liquid and Suction connection
Suction connection brazed 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 2»1/8 2»1/8
Liquid connection brazed 7/8» 7/8» 7/8» 7/8» 7/8» 7/8» 7/8» 7/8» 1»1/8 1»1/8
Coil
Type Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin
Tube size (mm) 9.52 9.52 9.52 9.52 9.52 9.52 9.52 9.52 9.52 9.52
Tube type Smooth Smooth Smooth Smooth Smooth Smooth Smooth Smooth Smooth Smooth
Height (mm) 1219 1219 1219 1219 1219 1219 1219 1219 1219 1219
Length (mm) 2743 2743 2743 3455 4115 4115 5486 5486 5486 5486
Face Area (m
2
) 3.34 3.34 3.34 4.21 5.02 5.02 6.69 6.69 6.69 6.69
Rows # 2 2 3 3 3 3 2 3 3 3
Fins per foot (fpf) # 156.0 156.0 156.0 156.0 156.0 156.0 156.0 156.0 156.0 156.0
Fan
Type Propeller Propeller Propeller Propeller Propeller Propeller Propeller Propeller Propeller Propeller
Number 2 2 2 3 3 3 4 4 6 6
Diameter (mm) 962 962 962 962 962 962 962 962 962 962
Drive type Direct Direct Direct Direct Direct Direct Direct Direct Direct Direct
Number of speeds 1 1 1 1 1 1 1 1 1 1
Air flow (m
3
/h) 27000 27000 25300 35900 37900 37900 54000 50700 89100 89100
Number of motors 2 2 2 3 3 3 4 4 6 6
Motor HP (2) (kW) 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 1.72 1.72
Rated Amps (2) (A) 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 3.26 3.26
Locked rotor Amps (2) (A) 6.9 6.9 6.9 6.9 6.9 6.9 6.9 6.9 15.5 15.5
Motor RPM (rpm) 705 705 705 705 705 705 705 705 930 930
Dimensions
Height (mm) 1582 1582 1582 1582 1582 1582 1584 1584 1598 1598
Length (mm) 2061 2061 2061 2921 2921 2921 2225 2225 3090 3090
Width (mm) 995 995 995 995 995 995 1865 1865 1948 1948
Weight uncrated (kg) 514 584 650 810 900 926 1040 1168 1575 1634
Weight crated (kg) 555 625 691 869 959 985 1123 1251 1695 1754
System Data
Refrigerant circuit 1 1 1 2 2 2 2 2 2 2
System Data
Refrigerant circuit 1 1 1 2 2 2 2 2 2 2
Refrigerant Charge (3)
Circuit A & B (kg)
(1) at 7°C SST and 35°C ambiant
(2) per motor
(3) per circuit
(4) 5°C sat suction temp. - 60°C sat discharge temp.
(5) In accordance with ISO 3746
Installation
Page 9
9RAU-SVX01F-E4
Installation
Table 4 - R134a General data
RAU 190 RAU 260 RAU 300 RAU 350 RAU 400 RAU 450 RAU 500 RAU 600 RAU 700 RAU 800
R134a R134a R134a R134a R134a R134a R134a R134a R134a R134a
Performances (1)
Gross cooling capacity (1) (kW) 43.8 53.2 63.9 75.4 85.1 93.6 106.3 127.9 153.8 172.7
Power input in cooling (1) (kW) 12.1 15.8 18.5 21.3 24.3 27.7 31.5 37.0 47.1 53.9
Main Power supply 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50
Sound Power Level (5) (dB(A)) 86 87 89 89 90 90 90 92 98 98
Units
Amps
Nominal (4) (A) 31.2 38.2 45.2 53.3 60.3 67.3 75.4 89.4 116.4 130.4
Start-up Amps (A) 139 194 201 209 216 223 231 245 272 286
Max supply cable size (mm
2
) 35 35 35 50 50 95 95 95 150 150
Compressor
Number 2 2 2 3 3 3 4 4 6 6
Type Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll
Model 10T+10T 10T+15T 2x15T 10+10T- 15T 10T+15T - 15T 15T+15T - 15T 2x(10T+15T) 2 x (15T+15T) 2x(10T+10T+15T) 2x(10T+15T+15T)
Number of speeds 1 1 1 1 1 1 1 1 1 1
Number of motors C1 / C2 2 2 2 2 / 1 2 / 1 2 / 1 2 / 2 2 / 2 3 / 3 3 / 3
Rated Amps (2)(4) (A) 12.7 12.7 / 19.7 19.7 12.7 / 19.7 12.7 / 19.7 19.7 12.7 / 19.7 19.7 12.7 / 19.7 12.7 / 19.7
Locked rotor Amps (2) (A) 120 120 / 175 175 120 / 175 120 / 175 175 120 / 175 175 120 / 175 120 / 175
Motor RPM (rpm) 2900 2900 2900 2900 2900 2900 2900 2900 2900 2900
Sump Heater (2) (W) 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V 50W - 400V
Liquid and Suction connection
Suction connection brazed 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 1»5/8 2»1/8 2»1/8
Liquid connection brazed 7/8» 7/8» 7/8» 7/8» 7/8» 7/8» 7/8» 7/8» 1»1/8 1»1/8
Coil
Type Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin Plate Fin
Tube size (mm) 9.52 9.52 9.52 9.52 9.52 9.52 9.52 9.52 9.52 9.52
Tube type Smooth Smooth Smooth Smooth Smooth Smooth Smooth Smooth Smooth Smooth
Height (mm) 1219 1219 1219 1219 1219 1219 1219 1219 1219 1219
Length (mm) 2743 2743 2743 3455 4115 4115 5486 5486 5486 5486
Face Area (m
2
) 3.34 3.34 3.34 4.21 5.02 5.02 6.69 6.69 6.69 6.69
Rows # 2 2 3 3 3 3 2 3 3 3
Fins per foot (fpf) # 156.0 156.0 156.0 156.0 156.0 156.0 156.0 156.0 156.0 156.0
Fan
Type Propeller Propeller Propeller Propeller Propeller Propeller Propeller Propeller Propeller Propeller
Number 2 2 2 3 3 3 4 4 6 6
Diameter (mm) 962 962 962 962 962 962 962 962 962 962
Drive type Direct Direct Direct Direct Direct Direct Direct Direct Direct Direct
Number of speeds 1 1 1 1 1 1 1 1 1 1
Air flow (m
3
/h) 27000 27000 25300 35900 37900 37900 54000 50700 89100 89100
Number of motors 2 2 2 3 3 3 4 4 6 6
Motor HP (2) (kW) 0.85 0.85 0.85 0.85 0.85 0.85 0.85 0.85 1.88 1.88
Rated Amps (2) (A) 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 4.2 4.2
Locked rotor Amps (2) (A) 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.8 14.7 14.7
Motor RPM (rpm) 680 680 680 680 680 680 680 680 915 915
Dimensions
Height (mm) 1582 1582 1582 1582 1582 1582 1584 1584 1598 1598
Length (mm) 2061 2061 2061 2921 2921 2921 2225 2225 3090 3090
Width (mm) 995 995 995 995 995 995 1865 1865 1948 1948
Weight uncrated (kg) 514 584 650 810 900 926 1040 1168 1575 1634
Weight crated (kg) 555 625 691 869 959 985 1123 1251 1695 1754
System Data
Refrigerant circuit 1 1 1 2 2 2 2 2 2 2
Refrigerant Charge (3)
Circuit A & B (kg)
(1) at 7°C SST and 35°C ambiant
(2) per motor
(3) per circuit
(4) 5°C sat suction temp. - 60°C sat discharge temp.
(5) In accordance with ISO 3746
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Split
system
Page 10
10 RAU-SVX01F-E4
Electrical connections
CAUTION!
1. The greatest care should be taken
when cutting through passages
and installing electric wiring.
Under no circumstances should
chips of metal or cuttings of
copper or isolating material fall
into the starter panel or electric
components. Relays, contactors,
terminals and control wiring
should be covered and protected
before power supplies are
connected.
2. Install power supply cabling
as shown in wiring diagram.
Adequate cable gland should
be chosen, ensuring no foreign
bodies enter the electrical housing
or components.
3. Cabling must comply with
standards in force. The type
and location of fuses must also
comply with standards. As a
safety measure, fuses should be
visibly installed, close to the unit.
4. Only copper wiring should be
used. Using aluminium wires can
produce galvanic corrosion and
possibly lead to superheat and
failure of connection points.
As standard, Trane provides the
single power supply which includes
the transformer. Warranty reserves
will be formulated if a transformer,
not supplied by Trane, is installed
inside the electric panel.
Temperature sensor
Two temperature sensors are
provided, in the control panel of
the unit. They have to be fitted on
site in order to measure the air inlet
and outlet temperature downstream
to the DX coil (evaporator). Refer
to supplied wiring diagram for
connection of sensors.
To place the sensor into the airflow,
the technician will have to cut the
cable between the electronic case
and the sensing element, and then
reconnect both elements with a
twisted pair cable with a maximum
distance of 300m.
Hot gas-bypass control
(option)
The hot gas bypass option only
provides a relay contact needed
to initiate hot gas bypass on the
evaporator. All the refrigerant piping
modifications are not done in the
factory and have to be done on the
jobsite. An additional refrigerant line
and solenoid valve must be added
on site (not provided) between the
discharge line and the suction line
on Circuit 1. When the solenoid
valve is activated, refrigerant vapor
will flow from the discharge line
to the suction line. This refrigerant
vapor satisfies the compressor mass
flow requirement, but because no
phase change has occurred, this flow
does not contribute to unit capacity.
The amount of capacity shed by the
hot gas bypass line depends upon
the size of the line (restriction) and
the pressure difference between the
discharge line and the suction line.
Closing the solenoid valve in the hot
gas bypass line deactivates hot gas
bypass.
Figure 3
1 = Air intake
2 = Fan
3 = Evaporating coil
4 = Air supply
5 = Evaporator leaving
air temperature sensor
6 = Evaporator entering
air temperature sensor
7 = Thermostatic expansion valve
8 = Sight glass
9 = Manual shut-off valve
10 = Filter dryer
11 = Liquid solenoid valve
Installation
Page 11
Functional description
The hot gas bypass solenoid valve
will be controlled by a normally open
(NO) relay output. Energizing the
solenoid will open the valve.
Freeze avoidance or evaporator limit
will also operate while in the hot
gas-bypass mode. Shutdown of the
unit when in hot gas-bypass due to
evaporator limit will not result in any
diagnostics and the unit will restart
normally when there is a need to
run.
Total time spent in hot gas bypass
mode will be recorded and available
to the user.
Design details
The following rules will be applied to
hot gas bypass operation, if hot gas
bypass is installed and enabled.
1. Hot gas bypass will be opened
when the circuit is running with
compressors at the minimum
(first) capacity step and the control
algorithm requires a further
reduction in capacity.
2. Hot gas bypass will be closed at
circuit startup.
3. Hot gas bypass will be closed
when it is already open, but
additional capacity is required.
4. Hot gas bypass will be closed
and the circuit shut down if the
unit has been running with hot
gas-bypass for more than the hot
gas-bypass time limit.
5. Hot gas bypass will be closed and
the compressor shut down if the
saturated suction temperature
for Circuit 1 gets below the Low
Refrigerant Temperature Cutout
+ 0.5°C.
Capacity control modes
RAUL units support air temperature
control and external capacity control
(optional), which are described
below. At least one of these options
must be configured.
Air temperature control (standard)
Units with an evaporator leaving
air temperature sensor is capable
of air temperature control. Air
temperature control is used on RAUL
units if the external capacity control
feature is not selected.
Air temperature control will
require an active air temperature
setpoint, based on a front panel air
temperature setpoint, an external
air temperature setpoint, a BAS air
temperature setpoint, and a local
schedule air temperature setpoint.
These settings are displayed on
DynaView and TechView similarly
to the existing chilled water setpoint
values.
The capacity control method is
identical to that used for chilled
water control, with setting changes
being used to adjust the control
appropriately.
External capacity control (option)
Optional replace air temperature
control
External capacity control be a
configurable option for RAUL units.
The configuration options are as
follows:
• NotInstalled
• 2LowVoltageBinaryInputs
(2 capacity steps)
• 3LowVoltageBinaryInputs
(3 capacity steps)
• 4LowVoltageBinaryInputs
(4 capacity steps)
When in external capacity control
mode, the unit is in AUTO command
mode, and there is no need to run,
«waiting for need to run» submode
is displayed.
Communication failure with any
of the external capacity control
hardware inputs will cause a
shutdown of the unit if the external
capacity control feature is configured
and enabled.
External capacity control overrides
any other capacity control mode
except manual control mode if
enabled.
11RAU-SVX01F-E4
Installation
Page 12
12 RAU-SVX01F-E4
Start-up Preparation
Carry out all operations on check list
and that the unit is correctly installed
and ready to operate.
The installer must check all the
following points before calling in the
Trane Servicing Department to put
the equipment into service:
- Check position of unit.
- Check unit is level.
- Check type and position of rubber
pads.
- Check clearance required
for maintenance access (See
submittals).
- Check clearance around condenser
(See Submittals).
- Check Filter(s) dryer are present.
- Insure that thermostatic expansion
valve(s) are well positioned.
- Insure that air discharge
temperature sensors are well
positioned.
- Insure that the isolation resistance
of all power supply terminals to
ground complies with standards
and regulations in force.
- Check that unit voltage and
frequency supplied match rated
input voltage and frequency.
- Check that all electrical
connections are clean and sound.
- Check that main power supply
switch is sound.
- On start-up of each motor in the
system, check the direction of
rotation and operation of all the
components they drive.
- Check that there is sufficient
demand for cooling on the day of
start-up (around 50% of nominal
load).
Start-up
Follow the instructions below to
correctly start-up the unit.
Installation and unit inspection:
- Ensure that all the operations
above (start-up preparation), are
followed.
Follow the instruction stuck inside
the electrical cabinet:
- Unscrew the screws securing the
isolators located under the rails
supporting the compressor.
- Put the plexiglass supplied by
Trane in front of the power
terminal.
- Ensure all refrigerant valves are in
service positions.
- Ensure that the unit is not
damaged.
- Check fixing of capillary tubes
(protection from vibration and
from wear) and ensure that they
are not damaged.
- Reset all manually set control
devices.
- Check refrigerating circuits
tightness.
Checking and setting:
Compressors:
- Check oil level at rest. The level
should reach at least halfway up
indicator located on housing. See
fig. 4 for correct level.
Figure 4 - Compressor oil level
Max oil level
Min oil level
- Check fixing of capillary tubes
(protection from vibration and
from wear) and insure that they
are not damaged.
- Reset all manually set control
devices.
- Check refrigerating circuits
tightness.
- Check oil acidity.
- Check electrical terminals
tightening of the motors and in the
control panel.
- Check the isolation of the motors
using a 500V DC megohmeter
which meets manufacturer’s
specifications (minimum value
2 megohms).
- Check the direction of the rotation
using phasemeter.
Electrical power wiring:
- Check all the electrical terminals
tightening.
- Set-up compressors overload
relays.
- Set-up fan-motors overload relays.
Electrical control wiring:
- Check all the electrical terminals
tightening.
- Check all the pressostats.
- Check and set-up the control
module.
- Test and start-up without the
electrical power.
Condenser:
- Check setting of the safety
pressure valve.
- Check direction of the rotation of
fans.
- Check the isolation of the motors
using a 500V DC megohmeter
which meets manufacturer’s
specifications (minimum value
2 megohms).
General start-up
Page 13
13RAU-SVX01F-E4
Operating parameters statement:
- Switch on main power supply
switch.
- Start-up the unit by pushing auto
on the control module screen.
- After unit start up, leave in
operation for at least 15 minutes,
to insure pressures are stabilized.
Then check:
- voltage.
- compressors and fan-motors
currents.
- suction temperature and pressure.
- ambient air temperature.
- blowing air temperature.
- discharge pressure and
temperature.
- liquid refrigerant temperature and
pressure.
- operating parameters:
- superheat: difference between
suction temperature and dew point
temperature. Normal superheat
must be within 5°C and 10°C.
- sub-cooling: difference between
liquid temperature and bubble
point temperature. Normal subcooling on standard unit with
R134a should be 5 to 10°C, and 2
to 5°C with 407c.
- difference between dew point
temperature in high pressure and
condenser air inlet temperature.
Normal value on standard unit
with R134a and all the fans
operating should be 15 to 18°C.
With 407C, it should be 20 to 23°C.
Final check:
When the unit is operating correctly:
- Check that the unit is clean and
clear of any debris, tools, etc…
- All valves are in operating
position.
- Close control and starter panel
doors and check panels fixation.
Caution
- For the warranty to apply, any
start-up carried out directly by
the customer must be recorded
in a detailed report, which must
be sent as soon as possible to the
nearest Trane office.
- Do not start-up a motor whose
insulation resistance is less than
2 meghoms.
- Phase imbalance should not be
greater than 2%.
- The voltage supplied to motors
should be within 5% of the rated
voltage on the compressor
nameplate.
- Excessive emulsion of the oil in the
compressor shows that refrigerant
is present in the oil and the result
will be that compressor is not
lubricated enough. Shut down
compressor and consult Trane
technician.
- Excess oil in compressor can
damage the compressor.
Before adding oil, consult Trane
technician. Use only Trane
products recommended.
- The compressors must operate
in a single direction of rotation. If
refrigerant high pressure remains
stable in the 30 seconds after
compressor start-up, immediately
shut down unit and check the
direction of rotation using
phasemeter.
General start-up
Page 14
14 RAU-SVX01F-E4
Control System
The control is through the CH530
control module.
Unit operations
- Start-up the unit by pushing
«auto» on the control module
screen.
Week end shutdown
- If the unit needs to be shut down
for a short period of time, push the
«stop» button of the module.
- If the unit is shut down for a longer
period, see under ”Seasonal
shutdown”, below.
- Insure that all safeties are taken
to protect the compressor against
refrigerant migration.
- Do not put the general and control
disconnect switches to off.
Seasonal shutdown
- If the unit needs to be shut down
for a short period of time, push the
«stop» button of the module.
- Carry out leak test.
- Carry out oil analysis
- Record operating pressures,
temperatures, amperages and
voltage.
- Check operation of machines/
compare conditions of operation
against original commissioning
data.
- Push the «stop» button of the
module.
- Insure that all safeties are taken
to protect the compressor against
refrigerant migration.
- Fill out the visit log sheet and
review with the operator.
- Do not put the general and control
disconnect switches to off.
Seasonal start-up
- Check operational set points and
performance.
- Calibrate controls.
- Check operation of all safety
devices.
- Inspect contacts & tighten
terminals.
- Megger the motor compressor
windings.
- Record operating pressures,
temperatures, amperages and
voltage.
- Carry out leak test.
- Check configuration of unit control
module.
- Change the oil as required based
upon results of the oil analysis
made during seasonal shutdown
- Check operation of machines/
compare conditions of operation
against original commissioning
data.
- Fill out the visit log sheet and
review with the operator
Operation
Page 15
15RAU-SVX01F-E4
Maintenance
The following maintenance
instructions are part of maintenance
operations required for this
equipment. A qualified technician
is needed for regular maintenance
as part of a regular maintenance
contract.
Carry out all operations as required
by schedule. This will insure long
unit service life and reduce the
possibility of serious and costly
breakdown.
Keep service records up to date,
showing monthly information on unit
operations.
These records can be of great help to
maintenance personnel diagnostics.
Similarly, if machine operator keeps
a log of changes in unit operating
conditions, problems can be
identified and solutions found before
more serious problems arise.
Inspection visit after the first 500
hours of operation from unit start up
- Carry out oil analysis.
- Carry out leak test.
- Inspect contacts and tighten
terminals.
- Record operating pressures,
temperatures, amperages and
voltage.
- Check operation of machines/
compare conditions of operation
against original commissioning
data.
- Fill out inspection visit log sheet
and review with the operator.
Monthly preventive visit
- Carry out leak test.
- Oil test of acidity.
- Inspect contacts and tighten
terminals.
- Record operating pressures,
temperatures, amperages and
voltage.
- Check operation of machines/
compare conditions of operation
against original commissioning
data.
- Fill out visit log sheet and review
with the operator.
Annual preventive visit
- Check operational set points and
performance.
- Calibrate controls.
- Check operation of all safety
devices.
- Inspect contacts & tighten
terminals.
- Megger the motor compressor
windings.
- Record operating pressures,
temperatures, amperages and
voltage.
- Carry out leak test.
- Check configuration of unit control
module.
- Carry out oil analysis
- Change the oil as required based
upon results of the oil analysis
- Check operation of machines/
compare conditions of operation
against original commissioning
data.
- Fill out the annual start up visit
log sheet and review with the
operator.
Caution
- Please refer to specific Trane
documentation on oil, available
from your nearest Trane office.
Oils recommended by Trane
have been exhaustively tested in
Trane laboratories to the specific
requirement of Trane unit and
hence the user’s requirements.
Any use of oils not meeting
specifications recommended by
Trane is the responsibility of the
user only, who thereby is liable to
warranty loss.
- Oil analysis and oil test acidity
must be carried out by a qualified
technician. Poor interpretation of
results may cause unit operating
problems. Also, oil analysis must
follow the correct procedures,
to avoid accidental injury to
maintenance personnel.
- If the condensers are dirty, clean
them with a brush. If the coils
are too dirty, consult a cleaning
professional. Never use water to
clean condenser coils.
- Contact Trane for information on
maintenance contracts.
Warning
- Switch off unit main power supply
before to any intervention. Failure
to follow this safety instruction
can lead to accident death of the
maintenance personnel and may
also destroy equipment.
- Never use steam or hot water
above 55°C to clean condenser
coils. The resulting increasing
pressure could cause refrigerant
loss.
Page 16
16 RAU-SVX01F-E4
INSTALLATION CHECKLIST
RAUL Trane Air Cooled Condensing Unit
This list must be checked off by the installer to ensure correct installation before the unit starts up.
Unit acceptance
o Check for damage, if any, on transportation
o Check for equipment shipped against delivery slip
o Check lifting system
Unit positioning
o Remove packaging
o Check position of unit
o Check unit is level
o Check clearance around condenser
o Check clearance required for maintenance access
o Check position of rubber pads
Refrigerant circuit
o Check filter dryer and sight glass presence
o Check oil traps presence on discharge line (if there vertical risers>3m)
o Check pitch for horizontal lines (1cm/m)
o Check refrigerant presence
Electrical equipment
o Check direction of rotation of compressors and fan motors
o Check installation and rating of mains power switch/fuse
o Check that electrical connections comply with specification
o Check that electrical connections match information on manufacturer’s identification plate
o Check electrical connections and connections to mains power switch
General
o Check available cooling charge (50% of rated installation load)
o Check with other trades handling installation works
Comments: .......................................................................................................................................................................................
...........................................................................................................................................................................................................
...........................................................................................................................................................................................................
...........................................................................................................................................................................................................
Signature: ............................................................Name .................................................................................................................
Order N° ..........................................................................................................................................................................................
Work site: ........................................................................................................................................................................................
Please return to your local Trane Service Office.
Page 17
17RAU-SVX01F-E4
Troubleshooting guide
These are simple diagnostic hints. If there is a breakdown, the Trane Service office should be contacted for
confirmation and assistance.
Problems symptoms Problem cause Action recommended
A) The compressor does not start up
Compressor terminals are live but motor does
not start
Motor burned out. Replace compressor
Contactor motor not operational. Coil burned out or broken contacts. Repair or replace.
No current ahead of motor contactor. a) Power cut.
b) Main power supply switched off.
Check fuses and connection.
See why system tripped.
If system is operational, switch on main
power supply.
Current ahead of fuse, but not on contactor
side.
Fuse blown. Check motor insulation. Replace fuse.
Low voltage reading on voltmeter. Voltage too low. Contact power Supply Utility.
Starter coil not excited. Regulation circuit open. Locate regulation device which has tripped
out and see why. See instructions concerning
this device.
Replace compressor.
Compressor does not run.
Compressor motor ”groans”.
High pressure switch tripped to contacts open
on high pressure.
Discharge pressure too high.
Compressor sticking
(damaged or sticking components).
Discharge pressure too high
See instructions for “discharge pressure
high”.
B) Compressor stops
High pressure switch tripped.
Over current thermal relay tripped. Discharge pressure too high. See instructions for “discharge pressure
high”.
a) Voltage too low.
b) Cooling demand too high, or condensing
temperature too high.
a) Contact Power Supply Utility.
b) See instruction “discharge pressure too
high”.
Motor temperature thermostat tripped.
Anti-freeze security tripped.
Not enough cooling fluid. Repair leak. Add refrigerant.
C) Compressor stops just after its start
Suction pressure too low.
Filter drier iced up.
Filter drier clogged. Replace filter drier.
Page 18
18 RAU-SVX01F-E4
Problems symptoms Problem cause Action recommended
D) The compressor keeps running without
stopping
Temperature too high in areas requiring airconditioning.
Excess load on cooling system. Check thermal insulation and air-tightness of
areas requiring air-conditioning.
E) Loss of oil in compressor
Oil level too low in indicator. Not enough oil. Contact Trane office before to order oil
Gradual fall in oil level.
Suction line too cold.
Compressor noisy
Filter drier clogged.
Liquid flows back to compressor.
Replace filter drier.
Adjust superheat and check bulb fixing of the
expansion valve.
F) Compressor noisy
Compressor knocks. Components broken in compressor. Change compressor.
Suction line abnormally cold. a) Uneven liquid flow.
b) Expansion valve locked in open position.
a) Check superheat setting and fixing of
expansion valve bulb.
b) Repair or replace.
G) Insufficient cooling capacity
Thermostatic expansion valve ”whistles”. Not enough refrigerant. Check refrigerant circuit tightness and add
refrigerant.
Excess pressure drops through filter drier. Drier filter clogged. Replace.
Excessive superheat. Superheat not properly adjusted. Check adjustment of superheat and adjust
thermostatic expansion valve.
H) Discharge pressure too high
Condenser abnormally hot. Presence of uncondensable liquids in system,
or excess refrigerant.
Purge uncondensable fluids and drain off
excess refrigerant.
Condenser air output too hot. Reduced air flow. Air intake temperature
higher than specified for unit.
Clean battery.
Check operation of motor fans.
Page 19
19RAU-SVX01F-E4
Note:
The above is not a comprehensive
analysis of the Scroll compressor
refrigeration system. The aim is to
give operators simple instructions
on basic unit processes so that
they have the technical knowledge
to identify and bring defective
operations to the notice of qualified
technicians.
Problems symptoms Problem cause Action recommended
I) Suction pressure too high
Compressor operates continuously. Excess cooling demand on evaporator. Check system.
Suction duct abnormally cold. a) Expansion valve too far open. a) Check for superheat and check that
expansion valve bulb is secure.
b) Replace.
Refrigerant flows back to compressor. b) Expansion valve locked in open position.
J) Suction pressure too low
Excessive pressure drop through filter
drier. Refrigerant does not flow through
thermostatic expansion valve
Drier filter clogged.
Expansion valve bulb has lost its refrigerant.
Replace the deshydrator.
Replace the bulb.
Loss of power. Expansion valve obstructed. Replace.
Superheat too low. Excessive pressure drops through evaporator. Check adjustment of superheat and adjust
thermostatic expansion valve.
Page 20
20 RAU-SVX01F-E4
0.2 -65.0 -72.5 2.7 -14.4 -20.9 6.0 7.8 1.7 27.0 62.8 58.8
0.3 -58.7 -66.1 2.8 -13.4 -20.0 6.5 10.2 4.2 28.0 64.4 60.5
0.4 -54.0 -61.3 2.9 -12.5 -19.1 7.0 12.6 6.6 29.0 65.9 62.1
0.5 -50.1 -57.3 3.0 -11.7 -18.2 7.5 14.8 8.9 30.0 67.4 63.7
0.6 -46.8 -54.0 3.1 -10.8 -17.3 8.0 16.8 11.0 31.0 68.8 65.3
0.7 -43.9 -51.0 3.2 -10.0 -16.5 8.5 18.8 13.0 32.0 70.2 66.8
0.8 -41.3 -48.4 3.3 -9.2 -15.6 9.0 20.7 15.0 33.0 71.6 68.3
0.9 -39.0 -46.1 3.4 -8.4 -14.8 9.5 22.6 16.9 34.0 72.9 69.7
1.0 -36.9 -43.9 3.5 -7.6 -14.0 10.0 24.3 18.7 35.0 74.2 71.1
1.1 -34.9 -41.9 3.6 -6.8 -13.3 11.0 27.6 22.1 36.0 75.5 72.5
1.2 -33.1 -40.0 3.7 -6.1 -12.5 12.0 30.7 25.3 37.0 76.7 73.9
1.3 -31.4 -38.3 3.8 -5.4 -11.8 13.0 33.6 28.3 38.0 77.9 75.2
1.4 -29.8 -36.7 3.9 -4.7 -11.0 14.0 36.4 31.1 39.0 79.1 76.5
1.5 -28.3 -35.1 4.0 -4.0 -10.3 15.0 39.0 33.8 40.0 80.2 77.8
1.6 -26.8 -33.7 4.1 -3.3 -9.6 16.0 41.4 36.4 41.0 81.3 79.1
1.7 -25.5 -32.3 4.2 -2.6 -8.9 17.0 43.8 38.8 42.0 82.4 80.3
1.8 -24.1 -30.9 4.3 -2.0 -8.3 18.0 46.0 41.2 43.0 83.4 81.5
1.9 -22.9 -29.6 4.4 -1.3 -7.6 19.0 48.2 43.4 44.0 84.3 82.7
2.0 -21.7 -28.4 4.5 -0.7 -7.0 20.0 50.2 45.6 45.0 85.2 83.9
2.1 -20.5 -27.2 4.6 0.0 -6.3 21.0 52.2 47.7 46.0 86.2 85.1
2.2 -19.4 -26.1 4.7 0.6 -5.7 22.0 54.2 49.7 47.0 87.1 86.2
2.3 -18.3 -25.0 4.8 1.2 -5.1 23.0 56.0 51.6 48.0 88.1 87.3
2.4 -17.3 -23.9 4.9 1.8 -4.5 24.0 57.8 53.5 49.0 89.1 88.4
2.5 -16.3 -22.9 5.0 2.4 -3.9 25.0 59.5 55.3 50.0 90.0 89.5
2.6 -15.3 -21.9 5.5 5.2 -1.0 26.0 61.2 57.1
Table 5- Dew point and Bubble temperature versus pressure for R407C
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Bubble
Temp.
(°C)
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Bubble
Temp.
(°C)
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Bubble
Temp.
(°C)
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Bubble
Temp.
(°C)
Dew Temperature at Evaporating Pressure
Dew Temperature at Condensing Pressure
Bubble Temperature at Condensing Pressure
Liquid Temperature at Condensing Pressure
Inlet Temperature at Evaporating Pressure
Subcooling = -
D
C
E
DCB
A
Performance Data
Performance data is given for Ambient air temperature versus Dew temperature at evaporating pressure. Refer to
point A on Figure 4.
Figure 4
A
B
C
D
E
R407C
Pressure
Condensing
Pressure
Subcooling
Liquid
Liquid
+
Vapour
Vapour
Enthalpy
Evaporating
Pressure
Page 21
21RAU-SVX01F-E4
Table 6 - Dew point temperature versus pressure for R134a
0,2 -56,4 2,7 -2,2 6,0 21,6 27,0 81,2
0,3 -49,7 2,8 -1,2 6,5 24,2 28,0 82,9
0,4 -44,6 2,9 -0,3 7,0 26,7 29,0 84,6
0,5 -40,5 3,0 0,7 7,5 29,1 30,0 86,2
0,6 -36,9 3,1 1,6 8,0 31,3 31,0 87,8
0,7 -33,9 3,2 2,5 8,5 33,5 32,0 89,3
0,8 -31,1 3,3 3,3 9,0 35,5 33,0 90,8
0,9 -28,6 3,4 4,2 9,5 37,5 34,0 92,3
1,0 -26,4 3,5 5,0 10,0 39,4 35,0 93,7
1,1 -24,3 3,6 5,8 11,0 43,0 36,0 95,1
1,2 -22,3 3,7 6,6 12,0 46,3 37,0 96,5
1,3 -20,5 3,8 7,4 13,0 49,5 38,0 97,8
1,4 -18,8 3,9 8,2 14,0 52,4 39,0 99,1
1,5 -17,1 4,0 8,9 15,0 55,2 40,0 100,3
1,6 -15,6 4,1 9,7 16,0 57,9 41,0 101,6
1,7 -14,1 4,2 10,4 17,0 60,5 42,0 102,8
1,8 -12,7 4,3 11,1 18,0 62,9 43,0 103,9
1,9 -11,4 4,4 11,8 19,0 65,2 44,0 105,0
2,0 -10,1 4,5 12,5 20,0 67,5 45,0 106,0
2,1 -8,8 4,6 13,1 21,0 69,6 46,0 107,1
2,2 -7,6 4,7 13,8 22,0 71,7 47,0 108,2
2,3 -6,5 4,8 14,5 23,0 73,7 48,0 109,2
2,4 -5,4 4,9 15,1 24,0 75,7 49,0 110,3
2,5 -4,3 5,0 15,7 25,0 77,6 50,0 111,4
2,6 -3,2 5,5 18,8 26,0 79,4
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Absolute
Pressure
(bar)
Dew
Temp.
(°C)
Page 22
22 RAU-SVX01F-E4
Notes
Page 23
23RAU-SVX01F-E4
Notes
Page 24
Trane optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand,
the leader in creating and sustaining safe, comfortable and energy efcient environments, Trane offers
a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts.
For more information, visit www.Trane.com.
Trane has a policy of continuous product and product data improvement and reserves the right to change design and specications
without notice.
© 2012 Trane All rights reserved
RAU-SVX01F-E4 January 2012. Supersedes RAU-SVX01E-E4_1110
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