Installation Instructions
CSHD and CSHN/CSHL
Compressors
Installation and Service
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.
January 2021
COM-SVN01D-EN
Introduction
Read thismanual thoroughly before operating or servicing
this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Your personal safetyand the proper operationof
this machine depend upon the strict observance of these
precautions.
The three types of advisories are defined as follows:
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
WARNING
CAUTIONs
NOTICE
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
situation which,
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
Indicates a situationthat could result in
equipment or property-damage only
accidents.
if not avoided, could
Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment. Trane advocates the responsible handling of
all refrigerants-including industry replacements for CFCs
and HCFCs such as saturated or unsaturated HFCs and
HCFCs.
Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified according to local rules. For
the USA, the Federal Clean Air Act (Section 608) sets forth
the requirements for handling,reclaiming, recovering and
recycling of certain refrigerants and the equipment that is
used in these service procedures. In addition, some states
or municipalities may have additional requirements that
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.
WARNING
Personal Protective Equipment (PPE)
Required!
Failure to wear proper PPE for the job being undertaken
could result in death or serious injury. Technicians, in
order to protect themselves from potential electrical,
mechanical, and chemical hazards, MUST follow
precautions in this manual and on the tags, stickers,
and labels, as well as the instructions below:
• Before installing/servicing this unit, technicians
MUST put
undertaken (Examples; cut resistant gloves/sleeves,
butyl gloves, safety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Safety Data Sheets
(SDS) and OSHA guidelines for proper PPE.
• When working with or around hazardous chemicals,
ALWAYS
(Global Harmonized System of Classification and
Labeling of Chemicals) guidelines for information on
allowable personal exposure levels, proper
respiratory protection and handling instructions.
• If there is a risk of energized electrical contact, arc, or
flash,
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.
on all PPE required for the work being
refertotheappropriate SDS and OSHA/GHS
technicians
MUST put on all PPE in accordance
© 2021 Trane COM-SVN01D-EN
Introduction
WARNING
Follow EHS Policies!
Failure to follow instructions below could result in
death or serious injury.
• All Trane personnel must follow the company’s
Environmental, Health and Safety (EHS) policies
when performing work such as hot work, electrical,
fall protection, lockout/tagout, refrigerant handling,
etc. Where local regulations are more stringent than
these policies, those regulations supersede these
policies.
• Non-Trane personnel should always follow local
regulations.
WARNING
R-410A Refrigerant under Higher Pressure
than R-22!
Failure to use proper equipment or components as
described below, could result in equipment failing and
possibly exploding, which could result in death, serious
injury, or equipment damage.
The units described in this manual use R-410A
refrigerant which operates at higher pressures than R-
22. Use ONLY R-410A rated service equipment or
components with these units. For specific handling
concerns with R- 410A, please contact your local Trane
representative.
WARNING
Explosion Hazard and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
Never solder, braze or weld on refrigerant lines or any
unit components
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
that are above atmospheric pressure
WARNING
Explosion Hazard!
Failure to follow these instructions could result in death
or serious injury or equipment or property-only
damage.
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Do not use acetylene, oxygen or
compressed air or mixtures containing them for
pressure testing. Do not use mixtures of a hydrogen
containing refrigerant and air above atmospheric
pressure for pressure testing as they may become
flammable and could result in an explosion. Refrigerant,
when used as a trace gas should only be mixed with dry
nitrogen for pressurizing units.
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized.When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
WARNING
Hazardous Conditions!
Observe and follow the “Warning” and “Notices” labels
on the compressor. Failure to follow these instructions
could result in death or serious injury or damage to the
equipment.
NOTICE
Use Proper Charging and Crankcase
Heater Operation Procedures!
Failure to utilize proper charging and crankcase heater
procedure will result in compressor failure. Refer to unit
IOM or
Before Start-Up,” p. 19
procedures.
“Charging the System,” p. 19 and “Verification
in this manual for the proper
COM-SVN01D-EN 3
Introduction
Copyright
This document and theinformation in it arethe property of
Trane, and may not be used or reproduced in whole or in
part without written permission. Trane reserves the right
to revise this publication at anytime, andto make changes
to its content without obligation to notify any person of
such revision or change.
Trademarks
All trademarks referenced in this document are the
trademarks of their respective owners.
Revision History
• Updated Model Number Descriptions chapter.
• Updated Torque values table in General Information
chapter.
• Updated Oil change factory table in General
Information
• Updated Compressor weight with full oil charge table
in General Information chapter.
• The following figures are updated in General
information chapter:
• Figure 4. Model CSHD/CSHL
• Figure
• The following figures are updated in Removal and
Installation chapter:
• Figure
• Figure
• Running edits.
chapter.
5. Model CSHD
11. CSHN wiring diagram
12. CSHD wiring diagram
4 COM-SVN01D-EN
Table of Contents
Overview ............................... 6
Literature Referenced .................. 6
Model Number Descriptions .............. 7
General Information ..................... 8
POE Oil ............................... 8
Oil Handling ........................ 8
Oil Level ........................... 8
Operating Envelope .................... 8
Refrigerant Type ..................... 9
Transportation, Handling, and Storage ... 9
Pre-Installation Inspections ........... 10
Repair Recommendations ............. 11
Mechanical Failure .................. 11
Electrical Failure ...................... 12
Two Types of Motor Failures .......... 12
Removal and Installation ................ 13
Removal ............................. 13
Compressor Replacement—Tandem and Trio
Compressor Sets ................... 14
Installation ........................... 15
Electrical Connections ................. 16
Leak Detection ....................... 17
Vacuum Testing and Evacuation ........ 18
Charging the System .................. 19
Verification Before Start-Up ............ 19
Start-Up ............................... 20
Maintenance ........................... 21
Troubleshooting ........................ 22
CSHN Motor Protection Module Diagnosis 23
COM-SVN01D-EN 5
Overview
The purpose ofthis documentis to provideinstallation and
service information for Trane CSHD and CSHN
compressors.
This document is not meant to be provide a step-by-step
procedure, but is intended to identify procedures or
precautions that may be unique to a Trane compressor and
should be taken into account to properly and safely
remove, install, and troubleshoot the compressor.
Each installation hasits unique set ofcircumstances which
also
Literature Referenced
For additional information, this literature includes
references to “unit Installation, Operation, and
Maintenance (IOM) manuals”. The following table lists
these IOMs by unit type:
be taken into account by the service technician.
must
Unit Type IOM
Air-Cooled Scroll Chillers Model CGAM 20–130 Ton CG-SVX17*-EN
IntelliPak™ II Commercial Single-Zone Rooftop Air
Conditioners
IntelliPak Single-Zone Rooftop Air Conditioners RT-SVX10*-EN
Voyager™ 12½–25 Ton Gas/Electric RT-SVX26*-EN
Voyager 12½–20 Ton Heat Pump RT-SVX33*-EN
Voyager 27½–50 Ton RT-SVX34*-EN
Split System Heat Pump Condensers, R-410 a 6-20
T
ons
Split System Cooling Condensers, R-410a 6-25
Tons
Remote Split System Units and Remote Chillers Air
Cooled Condensing Units
IntelliPak Commercial Self-Contained Signature
Series 20-110 T
(a) Installation, Operation, and Maintenance (IOM) manuals listed here are
current as of Februaryl 2015. Check e-Library for the most recent version.
ons
(a)
RT-SVX24*-EN
S
SP-SVX14*-EN
S
S-SVX10*-EN
SS-SVX11*-EN
SCXF-SVX01*-EN
6 COM-SVN01D-EN
Model Number Descriptions
CSHD125K0A0M
Digits 1, 2, 3, 4 — Model Type
CSHD = 6.2–15 Tons
CSHN = 15–30 Tons
CSHL = 30 Tons, LSPM motor
Digits 5, 6, 7 — Nominal Capacity
075 = 075 MBtu/h CSHD
089 = 089 MBtu/h CSHD
092 = 092 MBtu/h CSHD
103 = 103 MBtu/h CSHD
105 = 105 MBtu/h CSHD
110 = 110 MBtu/h CSHD
120 = 120 MBtu/h CSHD
125 = 125 MBtu/h CSHD
136 = 136 MBtu/h CSHD
142 = 142 MBtu/h CSHD
155 = 155 MBtu/h CSHD
161 = 161 MBtu/h CSHD
175 = 175 MBtu/h CSHD
183 = 183 MBtu/h CSHD
176 = 176 MBtu/h CSHN
184 = 184 MBtu/h CSHN
240 = 240 MBtu/h CSHN
250 = 250 MBtu/h CSHN
315 = 315 MBtu/h CSHN
374 = 374 MBtu/h CSHN/CSHL
Digit 8 — Voltage
J = 200–230/60/3
K = 460/60/3, 380–415/50/3
D = 575/60/3
X = 380/60/3
Digit 9 — Unloading
0 = No Unloading
Digit 10 — Design Sequence
Factory Assigned
Digit 11 — Motor Protection
Type
0 = Internal Line Break
H = 24 Vac
K = 115/230 Vac
Digit 12 — Basic Compressor Configuration
M = Standard volume ratio,
Suction and discharge tube
T = Standard volume ratio,
Suction and discharge Rotolock
R = Low volume ratio,
Suction and discharge tube
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
These models also have low volume ratio optimized options, besides the standard volume ratio options. See digit 12.
COM-SVN01D-EN 7
General Information
Table 1. Torque values
Item Torque
CSHD Rotolock equalizer nut 1-3/4 133 ± 10 N·m; 98 ± 7 ft·lb
CSHN Rotolock equalizer nut 2-1/4 133 ± 5 N·m; 98± 7 ft·lb
CSHD Terminal screws #10-32 X 0.5 in 2.75 ± 0.25 N·m; 25 ± 2 in·lb
CSHN Terminal set screw and nut 3.4 ± 0.25 N·m; 30 ± 2 in·lb
Ground screw (CSHD and CSHN) 1.90 ± 0.25 N·m; 17 ± 2 in·lb
Terminal box cover 2.15 ± 0.25 N·m; 19 ± 2 in·lb
Note: With rotolock fittings, always use two wrenches:
one toback-up on the sleeve and one to tighten the
nut. Proper torquingof the rotolocknut isimportant
to insure a leak-free joint.
POE Oil
Table 2. Oil charge factory
Model Pints Liters Trane Part Number
CSHD103 5.0 2.4 OIL00078, OIL00080
CSHD075-092 6.3 3.1 OIL00078, OIL00080
CSHD105–161 7.0 3.3 OIL00078, OIL00080
CSHD 175, 183 7.6 3.6 OIL00078, OIL00080
CSHN176–315 14.2 6.7 OIL00078, OIL00080
CSHN374/CSHL374 15.2 7.2 OIL00078, OIL00080
Notes:
1. OIL00078—1 quart container
2. OIL00080—1 gallon container
3. Oil amount and type is also printed on the nameplate.
4. Use only T
Oil Handling
POE oil is very hydroscopic, which means it absorbs
moisture very readily. Therefore, it is importantto properly
handle the oil.
POE Oil handling guidelines
• Always use the smallest container size required for the
job requirements.
• Always leave the oil container tightly sealed until time
of use.
• Do not reuse oil that has been opened.
rane-approved oils and do not mix oils.
Oil Level
Figure 1. Compressor oil label
The oil should be visible through the oil sightglass both
during operation and when the compressor(s) is off. Oil
level slightly below the sightglass, but still visible is
acceptable.
Single compressor. The oil level should be stable inthe
sightglass.
Tandem and trio compressors.
• Operation—The oil level will vary depending on the
operating condition.
• Unloaded condition—The running compressor will
have a higher oil level than the off compressor(s).
• Loaded condition—Oil should be visible through all
of the compressor sight glasses. Some may have a
higher level than others, but this is not abnormal.
• Off
—After several minutes, the oil levels should be the
same in each compressor and should be visible in the
sightglass. This is the best method to determine if the
system has sufficient oil.
Units overcharged with oil will operate with degraded
performance and could lead to compressor damage.
Operating Envelope
The compressor must be operated within the published
operating envelope.
8 COM-SVN01D-EN
Figure 2. Operating envelope
R410A Operating Map - Superheat
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
-30 -20 -10 0 10 20 30 40 50 60 70
R410A Operating Map - Superheat 20°F
Condensing temperature (°F)
General Information
Evaporating temperature (°F)
Refrigerant Type
CSHD and CSHN/CSHL compressors are approved for use
with R-410A refrigerant only. Any use of hydrocarbon
refrigerants or air is strictly prohibited!
Heavy Object!
Failure to follow instructions below could result in unit
dropping which could result in death or serious injury,
Transportation, Handling, and
Storage
The compressor must be handled in the vertical position
(maximum 15-degree offset from vertical). Should the
compressor be handled in an upside down position, its
suitability for its use can not be guaranteed.
Improper Handling!
Improper handling of the compressor resulting from
being handled or transported in the upside position,
dropped or tippedover could resultin internaldamage to
the compressor and it is recommended that the
compressor not be put into service.
Damage to compressor or packaging should be reported
to
shipper immediately.
the
Use a proper method of lifting the compressor,both lifting
ears must be used with a spreader bar.
COM-SVN01D-EN 9
NOTICE
and equipment or property-only damage. Ensure that all
the lifting equipment used is properly rated for the
weight of the unit being lifted. Each of the cables (chains
or slings), hooks, and shackles used to lift the unit must
be capable of supporting the entire weight of the unit.
Lifting cables (chains or slings) may not be of the same
length. Adjust as necessary for even unit lift.
For approximate compressor weight, see
Spreader bar use is recommended to better balance the
compressor.
WARNING
Table 3.
General Information
Figure 3. Lifting compressor with spreader bar
Use lifting hooks with close clasps.
Table 3. Compressor weight with full oil charge
Model Weight (lb)
CSHD 075 - 092 128
CSHD 103 - 125 142
CSHD 136 - 161 150
CSHD 175/183 160
CSHN 176 - 250 236
CSHN315 337
CSHN374/CSHL374 362
The compressor and its packaging must not beexposed to
rain and/or corrosive, flammable atmosphere.
The compressor mustnot bestored in anenvironment less
than -31°F (-35°C) or to exceed +160°F (+71°C).
WARNING
R-410A Refrigerant under Higher Pressure
than R-22!
Failure to use proper equipment or components as
described below, could result in equipment failing and
possibly exploding, which could result in death, serious
injury, or equipment damage.
The units described in this manual use R-410A
refrigerant which
22. Use ONLY R-410A rated service equipment or
components with these units. For specific handling
concerns with R- 410A, please contact your local Trane
representative.
Figure 4. Model CSHN/CSHL
operates at higher pressures than R-
Oil equalizer rotolock
connection fitting
Pre-Installation Inspections
Check the following before using the compressor:
• Compressor for visible shipping damage.
• Compressor is the correct model/part number.
• Compressor is the correct voltage.
• Compressor ship-with items:
– Restrictors for use with tandem and trio
compressors.
®
– Oil equalizer Teflon
gaskets.
Figure 5. Model CSHD
Oil valve with
dip tube
Oil equalizer rotolock
1/4 Schrader port
connection fitting
10 COM-SVN01D-EN
General Information
Figure 6. Tandem and Trio
TANDEM
Oil equalizer lines
Oil equalizer rotolock
connection fitting
Mechanical Failure
Replace only the failed compressor in a tandem or trio set.
Important: On tandem
and discharge lines must NOT be modified,
except for the use of slip joint couplings.
Other modification may cause oil return
issues and lead to compressor failure. Cut
the lines in a convenient place, remove the
compressor, and then unbraze the lines
from the compressor. On reinstallation,
reinstall lines to compressor and
reassemble the cut lines utilizing a slip
coupling. See
area
Figure 7. Suggested areas to cut refrigerant lines
or trio assemblies, the suction
Figure 7, p. 11 for suggested
to cut the discharge and suction line.
TRIO
Repair Recommendations
WARNING
Explosion Hazard and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
Never solder, braze or weld on refrigerant lines or any
unit components
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
that are above atmospheric pressure
Suggested area to cut the
refrigerant lines so that
they can be reinstalled
Minimize system and compressor open times to avoid
excessive moisture absorption by the POE oil. Maximum
suggested open time is 15 minutes.
Drain and replace oil in all the non-failed compressors.
Note: For CSHD
using a suction device through the oil equalizer
rotolock fitting (see
dedicated device
practice to flush the suction device with clean oil
prior to use.
The CSHN compressor has an oil drain with a Schrader
valve that can be used to remove the oil (see
).
p. 10
Replace unit liquid line filter-drier. This is a very important
part of controlling moisture in R-410A POE oil systems.
compressors, this requires removing oil
Figure 5, p. 10). Use a
for removing oil. It is good
Figure 4,
®
COM-SVN01D-EN 11
General Information
Reuse the compressors mounting isolators or mounting
spacers that are used with the existing compressor
assembly.
Braze the compressor into the system. Compressor
connections are copper-plated steel. Use BAg-28, 40%
silver, with pasteflux to make thecopper tube connections
to the compressor.
Proceed with the following as described in the following
sections:
•
“Leak Detection,” p. 17
• “Vacuum Testing and Evacuation,” p. 18
• “Verification Before Start-Up,” p. 19
Electrical Failure
Replace only the failed compressor in a tandem or trio set.
Drain and replace the oil in all the non-failed compressors.
Reuse the compressors mounting isolators or mounting
that
spacers
assembly.
Braze compressor into the system. Compressor
connections are copper-plated steel. Use BAg-28, 40%
silver, with pasteflux to make thecopper tube connections
to the compressor.
Important: On tandem or trio assemblies, the suction
Minimize
excessive moisture absorption by the POE oil. Maximum
suggested open time is 15 minutes.
Test the acid condition of the oil in the compressors using
an acid test kit. Use Trane Part Numbers KIT06815,
CHM00414, and KIT06754.
Two Types of Motor Failures
Light. If oil test kit is negative and oil is only slightly
discolored, treat in the same manner as a mechanical
failure.
Severe. If oil test kit is positive with strong pungent odor
and dark oil, drain and replace oil in all of the non-failed
compressors.
Reuse the compressor mounting isolators or mounting
spacers that
assembly.
are used with the existing compressor
and discharge lines must not be modified,
except for the use of slip joint couplings.
Other modification may cause oil return
issues and lead to compressor failure. Cut
the lines in a convenient place, remove the
compressor then unbraze the lines from the
compressor. On reinstallation, reinstall
lines to compressor and reassemble the cut
lines with aslip coupling.See
for suggested area to cut the discharge and
suction
system and compressor open times to avoid
are used with the existing compressor
line.
Figure 7, p. 11
This type of failure requires changingboth thesuction and
liquid
facilitate changing filter-driers, if required.
Install the suction filters no closer than the distance listed
in the following table. The distance is measured from the
centerline of the suction inlet tee (see
Braze compressor into the system. Compressor
connections are copper-plated steel. Use BAg-28, 40%
silver, with pasteflux to make thecopper tube connections
to the compressor.
Proceed with the following as described in previous
sections:
• “Leak Detection,” p. 17
• “Vacuum Testing and Evacuation,” p. 18
• “Charging the System,” p. 19
• “Verification Before Start-Up,” p. 19
Figure 8. Minimum distance before installation of
Compressor Model “X” Distance
CSHD 10 inches
CSHN tandem 16 inches
CSHN trio 25 inches
1. Use acid removal type filter-drier cores in both the
2. Change when the pressure drop exceeds 4 psig.
filter-driers. Use replaceable filter-drier cores to
line
Figure 7, p. 11).
suction
suction filter and liquid line filter drier.
line
filter
X Minimum Distance
CSHN/CSHL models
Test oil after 24 hours of operation. Change filter-drier
again if required. If oil is still acid, drain and replace oil in
all the non-failed compressors.
After system is clean, test kit indicates okay, remove the
suction clean up filter-drierand replace the liquid linedrier
with standard filter drier cores.
CSHD models
Since CSHD compressors do not have an oil drain valve
that allows complete oil charge removal, it is
recommended that after 24 hours of operation, the filterdrier cores
Operate the system for another 24 hours before changing
to remove
filter-drier in the liquid line.
be replaced with acidremoval filter-drier cores.
the suction filter-drier and install a standard
12 COM-SVN01D-EN
Removal and Installation
WARNING
Refrigerant under High Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury
or equipment damage.
System contains refrigerant under high pressure.
Recover
the system. See unit nameplate for refrigerant type. Do
not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives.
refrigerant
to relieve pressure before opening
WARNING
Explosion Hazard and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
Never solder, braze or weld on refrigerant lines or any
unit components that are above atmospheric pressure
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
Only qualified personnel should install or repair
refrigeration
services of qualified personnel. The steps listed below are
not meant to be an exact step-by-step procedure, but are
intended to identify procedures or precautions that may
be unique to a Trane compressor and should be taken into
account to properly and safely remove and install the
compressor. Each installation has its unique set of
circumstances which must be considered by the service
technician to perform a safe and successful compressor
replacement.
systems.
If you are not qualified, seek the
Removal
WARNING
Pressurized Burning Fluid
Failure to follow these instructions could result in death
or serious injury.
Before opening a system, you must remove refrigerant
from both the high and low sides of the system. If the
pressure is not removed from both sides of the system,
pressure could still exist in the system. If a torch is used
to unbraze the tubing the refrigerant and oil mixture
could ignite.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
For additional information regarding the safe discharge of
capacitors, see
• Prior to removing the compressor, open the unit
disconnect and place a lock on the disconnect to
prevent someone else from accidentally applying
power to the unit while it is under repair.
• Completely recover therefrigerant fromthe refrigerant
circuit being
atmosphere! Use Responsible Refrigerant Practices. If
adding or removing refrigerant, the service technician
must comply with all Federal, State, and local laws.
Before removing the electrical connections on the
compressor
power on:
• Compressor power terminals.
• Compressor motor protection module.
• After confirming the absence of power, remove the
electrical
–
Mark the electrical wires so they can be placed back
on the
compressor to prevent improper phasing.
– CSHD compressor terminalblocks are marked:T1 is
marked red, T2 is marked blue, and T3 has no mark
(see
PROD-SVB06*-EN.
repaired. Do not release refrigerant to the
a voltmeter to check for the absence of
use
connections.
same terminal on the replacement
Figure 12, p. 17).
COM-SVN01D-EN 13
Removal and Installation
• Remove oil prior to compressor removal:
– CSHN/CSHL Compressors
• CSHN
• If
– CSHD Compressors
• For CSHD compressors complete, oil removal
• If the compressor is in a tandem set, place a
Tip: Before removing the existing tubing from the
compressor, apply flux to the joint. This will aid in
the flow of the braze material and help keep the
joint clean forrebrazing. After fluxing,heat the joint
evenly to slightly higher temperature than the
melting temperature of the filler material. At this
point, the two parts of the assembly should be
easily separated.
• Refrigerant Connection Removal
– Single compressor—Cut the refrigerant lines in a
convenient
slip couplings. Then, unbraze the line from the
compressor and reuse it when the replacement is
installed.
• When
• The lifting device must be rated to handle the
and CSHL compressors have an oil valve
(see
Figure 4,
completely drained
an internal dip tube. After the refrigerant has
been recovered, pressurize the system with
nitrogen to help remove oil from the
compressor.
the compressor is in a tandem or trio set, place
a catch pan under the oil equalizer rotolock
connection on the compressor to catch the oil
from the oil equalizer tube or compressor when
the oil equalizer tube is removed.
requires
the oil equalizer rotolock fitting, see
p. 11
to
catch
connection fitting on the compressorto catch the
oil from the compressor when the oil equalizer
tube is removed. Refer to
location
fitting.
on
(see
weight
using a suctionor pump device through
. Flush the suction device with cleanoil prior
use.
pan under the oil equalizer rotolock
of the oil equalizer rotolock connection
location
removing the compressor use both hooks
the cap ofthe compressor with aspreader bar
Figure 3, p. 10).
compressor as listed in
) that allows oil to be
p. 10
out of thecompressor due to
Figure 6,
Figure 6, p. 11 for the
that allows reassembly with
Table 3, p. 10.
Compressor Replacement—Tandem and
Trio Compressor Sets
Definitions:
• Tandem—Two compressors
circuit.
• Trio—Three compressors on a single refrigerant
circuit.
on a single refrigerant
There are special considerations that are unique to
replacing compressors in a tandem or trio set:
1. Only replace the failed compressor.
2. On tandem or trio assemblies, the suction and
discharge lines
use of slip-joint couplings. Other modifications may
cause oil return issues and lead to compressor failure.
Cut the lines in a convenient place, remove the
compressor, and then unbraze the lines from the
compressor. On re-installation, reinstall lines to
compressor and reassemble the cut lines using a slip
coupling. Refer to
cut
the discharge and suction line.
Tip: Before removing the existing tubing from the
compressor, apply flux to the joint. This will aid in
the flow of the braze material and help keep the
joint clean for re-brazing. After fluxing, heat the
joint evenly to slightly higher temperature than the
melting temperature of the filler material. At this
point, the two parts of the assembly should be
easily separated.
3. Change oil in all compressors in the tandem or trio
compressors
a. CSHN/CSHL—Use the oil valve on the compressor.
b. CSHD—Remove the oil equalizer fitting and use a
suction or
compressor through the oilequalizer tube opening.
A suction type device should be used to remove oil
from the compressor.
Important: Some
must not be modified, except for the
Figure 7, p. 11 for suggested area to
whenever
pump device to remove the oil from the
require a restrictor be placed in the suction
inlet to balance the oil levels. Each service
replacement compressor ships with all the
restrictors that can be used with that
compressor. The restrictorsare packaged in
a bag with a label with the part number and
diameter required (see
number
diameter in millimeters is Ø31. The
restrictor is also marked on the face with
both the extension number, last three digits
of the part number, and diameter. For the
previous example, the restrictor would be
marked 010-31. Without the proper
restrictor installed the compressor oil level
balance will not be correct. Refer to the
instruction sheet included with the service
replacement compressor for the correct size
and location of the restrictor.
there is a failure.
compressor
X17311028010 and the internal
is
tandem configurations
Figure 9). The part
NOTICE
Incorrect Restrictor Size and Location!
Failure to install the correct size restrictor or in the
correct position will lead to improper oil levels in the
compressor. This could result in a compressor failure
due to low oil level.
14 COM-SVN01D-EN
Removal and Installation
4. It willbe necessary to use an oil catch pan under the oil
equalizer connection to catch the oil when the
connection is loosened and removed.
Figure 9.
Installation
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
For additional information regarding the safe discharge of
capacitors, see
Explosion Hazard and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
Never solder, braze or weld on refrigerant lines or any
unit components that are above atmospheric pressure
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
• Only qualified personnel should install or repair
refrigeration
services of qualified personnel.
• Pressure tests must be performed by qualified
personnel.
• The replacement compressor contains a nitrogen
charge of 5 psig.
PROD-SVB06*-EN.
WARNING
systems. If you are not qualified, seek the
• Remove the suction plug before the discharge plug to
avoid oil
• Keep exposure tothe atmosphere at aminimum due to
POE oil. Remove the rubber plugs only when ready to
install the compressor. Plug other compressor on
tandem or trio compressors.
Before removing
•
place a can pan under the rotolock fitting as the
compressor oil level is above the rotolock connection.
Oil must be added to the compressors after
installation.
a. Removal Instructions
Tip: Before removing the existing tubing from the
b. Installation
c. Preparation:
d. Brazing Technique
spray while opening the compressor.
the oil equalizer connection cap
compressor, apply flux to the joint. This will aid in
the flow of the braze material and help keep the
joint clean forrebrazing. After fluxing,heat the joint
evenly to slightly higher temperature than the
melting temperature of the filler material. At this
point, the two parts of the assembly should be
easily separated.
i. Forproper capillary action to occur,the tube and
the
oxide contamination. To remove the oil and
grease a commercial solvent or denatured
alcohol can be used. The surface may be
properly cleaned by brushing with a stainless
shell brush orby a stiffrubbing with emery cloth.
Wipe the joint clean to remove small foreign
particles such as emery dust, by wiping the
surface with a clean cloth. Once the surfaces are
clean, be careful not to touch them as oil from
the skin will contaminate the surfaces.
ii. Pre-fitthe existing tubing into the compressorto
check
compressor fitting. For compressors that have a
suction restrictor located in the suction inlet,
ensure that the tube is inserted completely such
that the suction restrictor fits tightly against the
end of the compressor suction connection.
iii. Apply flux with a brush to the outside of the
compressor
evenly apply theflux around the entire diameter.
Care must also be taken not to get the flux inside
of the tubing as this may result in contamination
of the refrigerant system.
iv. Reinsert the tube into the compressor
connection.
inserted, it must be restrained to prevent it from
backing out of the compressor connection
during the brazing process.
i. If possible, use a double-side torch while
brazing.
must be free of oil, grease, burrs, and
fitting
that it has full insertion into the
connecting tubing, taking care to
the tubing does not stay fully
If
,
COM-SVN01D-EN 15
Removal and Installation
ii. Use 40% silver brazing alloy with flux.
iii. Start heating the tube first. Evenly heat the tube,
location 1 (see
red color.
good indicator of when the proper brazing
temperature has been reached. Continue
heating the tube until the flux passes the
“bubbling” temperature range and becomes
quiet, completely fluid, and transparent—it
should have the appearance of clear water.
iv. Direct the flame from the tube to the fitting,
evenly
heating it until the flux that may be
remaining in the fitting is also completely fluid.
v. Sweep the torch between the fitting and the
tube, locations 1 and 2 (see
of the
heat being applied to the heavier and
slower-heating fitting until the tube and fitting
reach and maintain a uniform heat in both parts.
Figure 10. Brazing locations 1 and 2
2
vi. Pull the flame slightly back and feed the brazing
material
joint has been properly heated, the braze
material should flow around and into the joint.
Important: The heated
filler; the heat from the torch flame should
not be what melts the filler.
vii.Once the braze material has flowed around and
into the joint, briefly move the torch around the
fitting to ensure complete capillary action into
the joint.
viii.Check the joint to visually ensure that the braze
material is completely around the joint.
e. Post-Braze
Figure 10), until it reaches a dull
When using flux, this color is also a
Figure 10), with most
between the fittingand thetube. If the
in
base metal should melt the
NOTICE
balance the oil level in the compressor. Refer to
COM-SVN02*-EN,
recent version) for proper size and location of the
restrictor.
• When brazing refrigerant connections, protect
compressor body
damage.
• When brazing, always use a nitrogen purge to prevent
the formation
damage the compressor.
• CSHN/CSHL compressors havean internal check valve.
When pressurizing
allow the low-side pressure to exceed the high-side
pressure by more than 5 bar (72 psig). Such apressure
differential
damage. Also, slowly raise the pressure over a
two-minute time period to allow sufficient time for the
internal pressures in the compressor to equalize.
Installation: Restrictor (or the most
and terminal box from torch heat
of copper oxide contamination that can
the system, it is important to never
result in pressure compressor
could
Electrical Connections
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized.When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
NOTICE
Clean Flux From Joint!
Quench the joint with water or a wet rag while the joint
is still hot—but below 900°F—to shock off the flux. If
not cleaned off, flux could hide leaks. Flux is also
corrosive and could lead to long-term problems and
equipment damage if not properly removed.
• Tandem (two compressors) and trio combinations
(three compressors) with uneven compressor
combinations requires the use of restrictor(s) to
16 COM-SVN01D-EN
CSHN/CSHL
Before removing wires, mark them so that they can be
•
put back on the same terminal when the new
compressor is installed.
• Insure that the compressor model terminals are
installed on the correct terminals (see Figure 11, p. 17).
• If the compressor is not wired properly, it will shut off
within five seconds.
Proper torque for theterminal set screws andnuts is 30
•
in-lb.
•
Before starting
the compressor
phasing with a phase sequence meter similar to an
Ideal-Sperry Model 61-520.
Figure 11. CSHN/CSHL wiring diagram
L1
A
L2
B
L3
C
, check the electrical
BLACK
BLUE
RED
M2
M1
NO
COM
TH-S1TH+
S2
L1 L3L2
CONTROL
VOLTAGE
L
N
Removal and Installation
Figure 12. CSHD wiring diagram
Blue mark
indicating T2
(Phase B)
Unmarked
T3
Red mark
indicating T1
(Phase A)
• Ensure that the compressor model terminals are
installed on the correct terminals (see
• Proper torque for the terminal screws is 25 in·lb.
• Before starting the compressor, check the electrical
phasing with
a phase sequence meter similar to an
Ideal-Sperry Model 61-520.
(Phase C)
Figure 12).
L1 L3 L2
POWER
SUPPLY
PHASING TO BE CONNECTED AS SHOWN TO
PREVENT REVERSE ROTATION
CONTROL
CIRCUIT
MODULE INPUT
VOLTAGE
CSHD
The terminal blocks have red and blue marks for phase
identification. Compressor terminal T1 is red, compressor
terminal T2 is blue, and compressor terminal T3 is
unmarked. Depending on the unit type, several methods
of marking the wires may be used, colored wires, wire
color marks on the wire or wire numbers to indicated the
proper location of the wire on the compressor terminal
block.
If the wires are not marked, ensure that you mark them
prior
to removing them so that they can be reinstalled in
the same position.
NOTICE
Improper Power Phasing!
Check phasing before starting compressor. Operating
the compressor with improper phasing could cause
compressor failure.
Leak Detection
WARNING
Explosion Hazard!
Failure to follow these instructions could result in death
or serious injury or equipment or property-only
damage.
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Do not use acetylene, oxygen or
compressed air or mixtures containing them for
pressure testing. Do not use mixtures of a hydrogen
containing refrigerant and air above atmospheric
pressure for pressure testing as they may become
flammable and could result in an explosion. Refrigerant,
when used as a trace gas should only be mixed with dry
nitrogen for pressurizing units.
COM-SVN01D-EN 17
Removal and Installation
WARNING
Explosion Hazard!
Failure to properly regulate pressure could result in a
violent explosion, which could result in death, serious
injury, or equipment or property-only-damage.
When using dry nitrogen cylinders for pressurizing units
for leak testing, always provide a pressure regulator on
the cylinder to prevent excessively high unit pressures.
Never pressurize unit above the maximum
recommended unit test pressure as specified in
applicable unit literature.
Pressure Testing
• Use industry-standard and EPA-accepted techniques
for testing.
• Pressure tests must be performed by qualified
personnel.
• Use tools especially designed for leak testing.
• Do not exceed the high-side and low-side pressures
on
listed
• If no test pressure value is listed on the nameplate of
the unit, a pressure of no more than 150 psig is
acceptable.
• The CSHN compressor has an internal check valve.
When pressurizing the system, it is important to never
allow the low side pressure to exceed the high side
pressure by more than 5 bar (72 psig). Greater
pressure
damage. Also slowly raise the pressure over a
2-minute time period to allow sufficient time for
internal pressures in the compressor to equalize.
the unit nameplate.
differential
could result in compressor
NOTICE
Overpressure Damage!
Do not pressurize the low side of the compressor by
more than 5 bar (72 psig) higher than the high side of
the compressor within less than two minutes. Failure to
follow these instructions could result in compressor
damage.
• Pressure decay testing can be used to check for gross
leaks but
• After pressurizing the system use an R-410A leak
detection device to detect and locate leaks.
will not be able to detect the location of a leak.
NOTICE
Compressor Motor Damage!
Never use the compressor as a vacuum pump. Never
meg-ohm test or apply power to the compressor while
it is in a vacuum. Failure to follow these instructions
could cause compressor motor damage.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/tag
out procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged. Failure to
disconnect power and discharge capacitors before
servicing could result in death or serious injury.
• Ensure that there is no voltage being applied to the
compressor
Evacuate the unit to 500 microns.
•
• Hold vacuum for 30 minutes.
• Rapid pressure rise indicates a leak; locate and repair
leak.
the
•
Slow pressure rise indicates one of two possibilities:
– A small leak, indicated by a continuous rise in
pressure.
– Moisture in the system, indicated by a slow rise in
pressure
to the moisture level. If this occurs, break the
vacuum with dry nitrogen and repeat evacuation
process to 500 micron.
• Once system is leak-tight, connect compressor repeat
the
vacuum
nitrogen and evacuate to 500 microns. The vacuum
should be
the vacuum
reads the system pressure.
• Vacuum must be measured in the refrigeration system
and not at the vacuum pump.
terminals.
and
leveling-out at a pressure equivalent
procedure, break vacuum with dry
able to be maintained for four hours. Isolate
pump so that the vacuum gauge only
Vacuum Testing and Evacuation
• Use the procedure as described in the unit Installation,
Operation, and Maintenance manual (see
Referenced,” p. 6
• If no other information is available, use the following
information.
18 COM-SVN01D-EN
).
“Literature
Removal and Installation
Charging the System
WARNING
Hazardous Pressures!
Failure to follow instructions below could result in a
violent explosion, which could result in death or serious
injury.
If a heat source is required to raise the tank pressure
during removal of refrigerant from cylinders, use only
warm water or heat blankets to raise the tank
temperature. Do not exceed a temperature of 150°F. Do
not under any circumstances apply direct flame to any
portion of the cylinder.
Use R-410A refrigerant only! Follow the instructions in the
unit Installation,
“Literature Referenced,” p. 6) for proper charging
methods.
If there are no instructions available, use these guidelines:
• Evacuate the unitas described in
Evacuation,” p. 18
• Ensure that the oil level is at least 1/2-sight glass in the
compressor
• Do not use the compressor to pull refrigerant into the
system.
• Charge liquid refrigerant into the high-side of the
unit—either into
equipped.
• Charge as much of the unit refrigerant charge as
possible before starting the compressor.
• Do not charge liquid refrigerant into the low side of the
compressor without the compressor running. Small
amounts of liquid may be metered through refrigerant
gauges into the suction line while the compressor is
operating.
• If the unit is equipped with suction and discharge
service
procedure.
•
Water chiller units—Always operate the chilled water
pumps while charging the unit to prevent freezing the
evaporator.
Operation, and Maintenance manual(see
“Vacuum Testing and
.
the condenser or liquid receiver, if so
valves,
close them during the charging
NOTICE
Improper Crankcase Heater Operation!
Exception to the 8-hour minimum crankcase heater
operation time.
Apply power to the crankcase heater for a minimum of
8 hours prior to startup of the compressor! Failure to
follow this instruction could result in a compressor
failure.
If the compressor is a replacement for a failed compressor
and has been charged in accordance with either the
procedures in theunit IOM or
in this manual, the compressor could be immediately
started
that the refrigerant has not had sufficient time to migrate
to the compressor and cause potential damage upon
startup. The system should set for no more 8 hours or
overnight
heater operation. If the time exceeds 8 hours or the unit
sits overnight,
for a minimum of 8 hours prior to starting the compressor.
If liquid refrigerant was charged into the suction or low
side during
occur.
charging the system. The reason for this is
after
a refrigerant charge without crankcase
with
the crankcase heater must be operational
the charging procedure, damage could still
“Charging the System,”p. 19
Verification Before Start-Up
Follow the instructions in the unit Installation, Operation,
and Maintenance manual (see “Literature Referenced,”
). If there are no instructions available, use these
p. 6
guidelines:
Before starting theunit, verifythat all servicevalves are
•
open.
•
Energize the crankcase heater a minimum of 8 hours
before starting the compressor
COM-SVN01D-EN 19
Start-Up
Follow the instructions in the unit Installation, Operation,
and Maintenance manual (see
p. 6
). If there are no instructions available, use these
guidelines:
Equipment Damage!
Failure to follow guidelines below could result in
equipment damage.
• Never start the compressor without refrigerant in the
system.
• Never bypass the low pressure switch to start the unit.
• Monitor oil level for 60 minutes to ensure that oil
from
returns
• Check system pressures and temperatures to ensure
they are in line with unit design pressures. Refer to the
unit Installation, Operation, and Maintenance manual
“Literature Referenced,” p. 6) for this information.
(see
• To top off theunit, charge liquid refrigerant mayadded
by slowly
done only when the compressor is operating.
• Do not overcharge the unit.
• Recommended system full load superheats—unless
specified differently
andMaintenancemanual(see
)—is 16°F–20°F.
p. 6
• Measure the oil sump superheat. Oil sump superheat
should be
calculated as follows:
Oil Sump Superheat = Oil Sump Temperature –
Saturated Suction
• Measure the oil sump temperature by placing a
thermocouple on the bottom of the compressor,
preferably in thecenter, and insulate it.Calculate sump
superheat. If less than 20°F, recheck the expansion
valve superheat and increase it. Low sump superheat
is indicated by foaming compressor oil.
• After fully charging the unit, recheck all pressure,
temperatures,
• Ensure that the compressor protection module and
power supply wires are installed on the correct
terminals (see
• CSHD: Proper torque for the terminal set screws is 25
in-lb.
• CSHN/CSHL: Proper torque for the terminal set screws
is 30 in-lb.
the system.
throttling it intothe suction line. This must be
greater than 20°F. Oil sump superheat is
Temperature
and electrical readings.
Figure 11, p. 17 and Figure 12, p. 17).
“Literature Referenced,”
NOTICE
in the unit Installation, Operation,
“LiteratureReferenced,”
20 COM-SVN01D-EN
Maintenance
Check the unit Installation, Operation, and Maintenance
manual (see
instructions.
Operating conditions must always remain within the
operating range
• Operating pressures (suction and discharge pressure).
• Operating temperatures (suction, discharge, and
liquid).
• Operating parameters (compressor superheat,
subcooling,
amperage).
• Check all of the following on a regular basis:
– System operating conditions.
– System refrigerant charge level.
– Oil levels and oil color.
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
“Literature Referenced,” p. 6) for specific
of the compressor. This includes:
oil
sump superheat, voltage, and
WARNING
• Check electrical connections (prior to startup each
season).
• Check unit operating controls.
COM-SVN01D-EN 21
Troubleshooting
Model CSHN374/CSHL374 compressors contain an
Important: Check the unit Installation, Operation, and
Maintenance manual (see
Referenced,”p. 6
regarding diagnosis
)foradditional information
“Literature
and causes.
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized.When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
Compressor will not start
• Refer to the unit Installation, Operation, and
Maintenance manual (see
p. 6
) for possible diagnostics codes and corrective
action.
• Verify:
– Compressor voltage is correct.
CSHN/CSHL compressors
–
module is the correct voltage.
– All safety switches are closed.
– All the contacts on the contactor are pulled in.
– CSHD
compressors
may
be open. Disconnect power to the unit and
disconnect the wires from the compressor
terminals. With an ohm meter, check to ensure that
there is resistance between T1-T2 and T3.
Compressor will not build up pressure
•
CSHD compressor is wired incorrectly—It will be noisy
and draw 1/2 the expected amps. Shut the compressor
off immediately. Running in this condition for more
than 5 seconds may damage the compressor.
CSHN compressor is wired incorrectly.
•
• Check to ensure that any bypass valves in the system
are not
• Four-way reversing valve may be stuck and not
switched properly bypassing from the high side to the
low side of the system; this situation is indicated by an
extremely warm suction inlet to the compressor.
22 COM-SVN01D-EN
open.
“Literature Referenced,”
—Motor protection
—The internal motor overloads
•
internal pressure relief that may have opened.
take two to three hours to reset. The oil sump will be
very warm
the motor protection module. This is caused by a very
high 625–715 psid difference between the high side
and
a blocked high side or low side.
and the compressor will be tripped out on
low side ofthe system. This could occur witheither
It may
Abnormal running noise
• Compressor is running backwards—Immediately shut
off the compressor and check wiring and proper
phasing.
• Excessive floodback—The superheat should be a
minimum of 16°F at full loadand oil sump temperature
should be at least 20°F above the saturated suction
temperature. Measure the sump temperature at the
bottom center of the compressor. Chillers with
electronic expansion valves may operate with lower
superheats; check the unit Installation, Operation, and
Maintenance manual (see
p. 6
) for proper operating superheats.
• Compressor is full of liquid on startup—The crankcase
heater
either
was not energized for a minimum of
eight hours, or it is defective.
• Mechanical damage to the compressor has occurred—
Check compressor amperage. It may also trip the
compressor motor protection module or other unit
electrical protection devices such as circuit breakers.
“Literature Referenced,”
High-pressure control opens
• Check the unit Installation, Operation, and
Maintenance manual (see
p. 6
) for possible diagnostics codes and corrective
action.
• Also check for:
– Defective condenser fan motors or controls.
– Dirty air-cooled or water-cooled condensers.
– Restricted air flow.
– Insufficient water flow.
– System overcharged with refrigerant. Check
superheat
– Non-condensables in the system.
and system subcooling.
“Literature Referenced,”
Low-pressure control opens
• Check the unit Installation, Operation, and
Maintenance manual (see
p. 6
) for possible diagnostics codes and corrective
action.
• Also check for:
– Defective evaporator fan motors, belts, or controls.
– Defective TXV valve.
“Literature Referenced,”
Troubleshooting
– Plugged liquid line filter.
– Liquid line solenoid valve does not open (if so
equipped).
– Dirty evaporators, either air-to-air or water-to-air.
– Restricted airflow.
– Insufficient evaporator water flow.
– System undercharged with refrigerant. Check
system
superheat
and subcooling.
Compressor short cycling
• Check the unit Installation, Operation, and
Maintenance manual (see
) for possible diagnostics codes and corrective
p. 6
action.
• Also check for:
– Defective unit controls—maximum 12 starts per
hour.
– Compressors cycling on safety controls.
– Unit oversized.
– Building load is light—this is likely to occur
building occupancy
“Literature Referenced,”
prior
.
Motor protector module resets
• Type: Manual reset
Fault modes:
– Phase sequence
– Multiple motor temperature overload cycles.
Reset—Remove power from module for five seconds.
• Type: Auto reset with five-minutes delay (sensors
exceed
Fault
– Over current
– Running phase loss
– Motor over temperature (manual reset required
Reset—Auto-reset occurs when motor temperature
sensors resistance
minutes delay). Although module will reset
automatically the compressor(s) may not because the
protection module may be wired in a safety lockout
circuit.
4500 ohms)
modes:
4-10
after
auto reset cycles)
drops below 2750 ohms (plus 5
NOTICE
Excessive Voltage on PTC Sensors!
Do not measure the motor PTC sensors with a device
rated at more than 3 Vdc. Failure to follow these
instructions could cause thermistor failure, resulting in
a compressor replacement.
Incorrect phase sequence
Incorrect phase sequence protection—compressor will
run approximately five seconds and trip off, pending the
motor protection module is correctlywired intothe system
safety circuit. If the motor is believed to be incorrectly
phased, change two of the three wires.
PTC Overheat (motor over temperature/over
current)
• Compressor motor drawing too much current.
• Defective compressor; look for dark oil in the
sightglass.
• Low voltage (voltage outside the
nominal voltage); voltage utilization range is printed
on compressor nameplate.
• Unbalanced voltage—must not exceed 2% imbalance.
• Motor PTC thermistorresistance above4500 ohms will
cause the motor protector to open. The motor
protector will reset at resistance below 2750 ohms. A
five-minute time
to
the maximum number of auto reset cycles has been
reached. The module will then be locked out until it is
manually reset.
• When measuring the PTC sensors, do not use a meter
with
greater
• CSHN374/CSHL374 internal relief valve has opened.
• Phase loss.
• Defective contactor.
• Loose or poorelectrical connections at the compressor
contactor.
or
delay is active after cool down until
than 3 Volt.
±10% range from
CSHN Motor Protection Module
Diagnosis
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized.When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
COM-SVN01D-EN 23
Troubleshooting
If M1-M2 contacts are open, proceed as follows:
1. Check motor protection module for the correct input
voltage on terminals L and N. Voltage applied to
module must match module input voltage as printed
on module nameplate.
2. Check wire connection tightness.
3. Try to reset the module (interrupt power for
five seconds).
4. If, after reset, module M1-M2 closes, determine which
fault caused module to trip.
5. If M1-M2 remains open, proceed as follows:
Disconnect PTC thermistors from S1and S2 terminals,
measure the resistance of the PTC using a device
and
with a maximum output of 3 volts.
• Resistance
Open PTC open; replace compressor
• Resistance
PTC shorted; replace compressor.
• Resistance
Wait until the motor has cooled down and
resistance is less than 2750 ohms; reconnect and
try to reset motor protector. Diagnose problem that
caused motor over temperature.
• Resistance = 150 ohms < R< 1250 ohms
Normal resistance value for PTC ambient
temperature.
= ∞
= 0 ohms
>2750 ohm
Test the module within the terminal box
1. Disconnect L-N voltage supply.
2. Disconnect S1-S2 PTC circuit on the module.
3. Disconnect M1-M2 safety circuit control contacts.
4. Apply a resistance between 150-1250 ohms across S1This simulates a functional, cool motor.
S2.
5. Reconnect L-N voltage supply. Insure that the voltage
L-N has been disabled for at least 5 seconds. Thiswill
to
reset the module.
6. Check M1-M2 with ohmmeter.
7. M1-M2 closed—Module okay.
8. M1-M2 open—Module defective.
24 COM-SVN01D-EN
Trane - by Trane Technologies (NYSE: TT), a global climate innovator - creates comfortable, energy
efficient indoor environments for commercial and residential applications. For more information,
please visit trane.com or tranetechnologies.com.
Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without
notice. We are committed to using environmentally conscious print practices.
COM-SVN01D-EN 29 Jan 2021
Supersedes COM-SVN01C-EN (Jun 2020)
©2021 Trane
Loading...