Trane CAUC-C20 Owner's manual

InstallationCAUC-IOM-7
Operation
Maintenance
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ProductAir Cooled Condenser
ModelCAUC
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Date October 2008
File No.SV-UN-S/S-CAUC-IOM-7 10/08
December 2001sedesrepuS
TM
Remote Air Cooled Condensers
Models
"J" and Later Design Sequence
CAUC-C20 CAUC-C40
CAUC-C25 CAUC-C50
CAUC-C30 CAUC-C60
Note: The installation of this equipment must
comply with all National, State, and Local
Codes.
© 2008 Trane All rights reserved
http://www.trane.com
Since the manufacturer has a policy of continuous product
improvement, it reserves the right to change specifications and
design without notice.

2
About The Manual
Literature Change History
CAUC-IOM-7 (December 2001)
First issue of manual; provides Installation, Operation, and
Maintenance instructions for “J” and later design sequence
on CAUC 20 through 60 Ton air cooled condensing units.
Overview of Manual
Note: One copy of this document ships inside the
control panel of each unit and is customer
property. It must be retained by the unit's
maintenance personnel.
This booklet describes proper installation, operation, and
maintenance procedures for air cooled systems. By care-
fully reviewing the information within this manual and follow-
ing the instructions, the risk of improper operation and/or
component damage will be minimized.
It is important that periodic maintenance be performed to
help assure trouble free operation. A maintenance schedule
is provided at the end of this manual. Should equipment
failure occur, contact a qualified service organization with
qualified, experienced HVAC technicians to properly diag-
nose and repair this equipment.
Note: The procedures discussed in this manual
should only be performed by qualified, experienced
HVAC technicians. Do Not release refrigerant to the
atmosphere! If adding or removing refrigerant is
required, the service technician must comply with
all federal, state, and local laws.

3
Table of Contents
Section One
About The Manual
Literature Change History................................................2
Overview of Manual .........................................................2
Section Two
General Information
Model Number Description ..............................................4
Unit Nameplate ................................................................4
Hazard Identification ........................................................4
Unit Description................................................................4
Unit Component Layout and "Shipwith" Locations..........5
Section Three
Installation
Unit Inspection .................................................................6
Unit Clearances ...............................................................6
Unit Dimensions & Weight Information............................6
Foundation .......................................................................6
Rigging ...........................................................................14
Unit Isolation ..................................................................15
Neoprene Isolators .....................................................15
Spring Isolators ..........................................................16
Leveling the Unit ............................................................16
General Unit Requirements ...........................................17
Refrigerant Piping.......................................................17
Main Electrical Power Requirements .........................17
Field Installed Control Wiring .....................................17
Refrigerant Piping ..........................................................18
Liquid Lines ................................................................18
Liquid Line Components ............................................18
Discharge (Hot Gas) Lines.........................................18
Discharge Line Components......................................19
Making Refrigerant Connections ...................................19
Brazing Procedures .......................................................19
Leak Testing Procedure .................................................20
Field Installed Power Wiring ..........................................20
Main Unit Power Wiring..............................................20
Field Installed Control Wiring .....................................23
CCAD Package Chiller Interface................................23
Section Four
System Pre-Start Procedures
System Evacuation Procedures.....................................26
Voltage Imbalance .........................................................28
Electrical Phasing ..........................................................28
Section Five
System Start-Up
Sequence of Operation ..................................................29
Verifying Proper Condenser Fan Rotation.....................30
All Fans are Rotating Backwards;..............................30
Some Fan Rotating Backwards..................................30
Low Ambient Damper Adjustment .................................31
Charging the System .....................................................31
Section Six
Service and Maintenance
Monthly Maintenance.....................................................38
Coil Cleaning..................................................................39
Index ..................................................................................40

4
General Information
Model Number Description
All Trane products are identified by a multiple-character
model number that precisely identifies a particular type of
unit. An explanation of the alphanumeric identification code
is provided below. Its use will enable the owner/operator, in-
stalling contractors, and service engineers to define the op-
eration, specific components, and other options for any spe-
cific unit.
When ordering replacement parts or requesting service, be
sure to refer to the specific model number, serial number,
and DL number (if applicable) stamped on the unit name-
plate.
Sample Model No.: CAUC - C60 4 - 2 A 1 0 H, etc.
Digit No.: 1 2 3 4 5,6,7 8 9 10 11 12 13 +
Digit 1 - Unit Type Digit 8 - Power Supply Digit 11 - Ambient Control
C=Condenser G= 200/230/60/3 XL 0 =Standard
4 = 460/60/3 XL 1 = 0
o
F
Digit 2 - Condenser 5 = 575/60/3 XL
A= Air Cooled Digit 12 - Agency Approval
Digit 9 - Condenser Circuit 0 =None
Digit 3 - Air Flow 1 =Single 3 =UL /CSA
U = Up Flow 2 = Dual Digit 13 - Miscellaneous Options,etc.
Digit 4 - Development Sequence Digit 10 - Design Sequence H = Copper Fins
C = Third J = Disconnect Redesign 1 = Spring Isolators
2 = Rubber Isolators
Digits 5,6,7 - Nominal Capacity 9 = Packed Stock
C20 = 20 Tons
C25 = 25 Tons
C30 = 30 Tons
C40 = 40 Tons
C50 = 50 Tons
C60 = 60 Tons
Unit Nameplate
One Mylar unit nameplate is located on the outside upper
right corner of the control panel door. It includes the unit
model number, serial number, electrical characteristics,
weight, refrigerant charge, as well as other pertinent unit
data. A small metal nameplate with the Model Number, Se-
rial Number, and Unit Weight is located just above the Mylar
nameplate, and a third nameplate is located on the inside of
the control panel door.
When ordering replacement parts or requesting service, be
sure to refer to the specific model number, serial number,
and DL number (if applicable) stamped on the unit name-
plate.
Hazard Identification
Warnings are provided through-
out this manual to indicate to installing contractors, opera-
tors, and service personnel of potentially hazardous situa-
tions which, if not avoided, COULD result in death or seri-
ous injury.
Cautions are provided throughout
this manual to indicate to installing contractors, operators,
and service personnel of potentially hazardous situations
which, if not avoided, MAY result in minor or moderate in-
jury.
Unit Description
All air cooled condensing units are designed for outdoor in-
stallations with vertical air discharge. These units may be
installed on a flat roof or placed on a concrete slab at
ground level.
Before shipment, each unit is leak-tested, evacuated, a Ni-
trogen holding charge is added, and the controls are tested
for proper operation.
The condenser coils are aluminum fin, bonded to copper
tubing. Copper-fin coils are optional. Louvered condenser
grilles for coil protection are standard.
Direct-drive, vertical discharge condenser fans are provided
with built-in current and overload protection.
For “Shipwith” items, refer to the Unit Component “Layout”
and “Shipwith” Locations illustration.
If low ambient operation is required, low ambient dampers
are available as a field or factory installed option.
The unit control panel contains all required fan cycling con-
trols, compressor interlocks, and a 115 volt control power
transformer. Field wiring, electrical schematics and panel
connection diagrams are located inside the control panel
access door.

5
General Information (Continued)
Unit Component “Layout” and “Shipwith” Locations
(60 Ton Unit Illustrated)

6
Installation
Unit Inspection
As soon as the unit arrives at the job site
[ ] Verify that the nameplate data matches the data on the
sales order and bill of lading (including electrical data).
[ ] Verify that the power supply complies with the unit name-
plate specifications.
[ ] Visually inspect the exterior of the unit, including the roof,
for signs of shipping damage.
[ ] Check for material shortages. Refer to the Component
Layout and Shipwith Location illustration.
If the job site inspection of the unit reveals damage or mate-
rial shortages, file a claim with the carrier immediately.
Specify the type and extent of the damage on the "bill of
lading" before signing.
[ ] Visually inspect the internal components for shipping
damage as soon as possible after delivery and before it
is stored. Do not walk on the sheet metal base pans.
NO STEP SURFACE!
FOR ACCESS TO COMPONENTS, THE BASE SHEET
METAL SURFACE MUST BE REINFORCED.
Bridging between the unit's main supports may con-
sist of multiple 2 by 12 boards or sheet metal grating.
Failure to comply can cause severe personal injury
or death from falling.
[ ] If concealed damage is discovered, notify the carrier's
terminal of damage immediately by phone and by mail.
Concealed damage must be reported within 15 days.
Request an immediate joint inspection of the damage by
the carrier and the consignee. Do not remove damaged
material from the receiving location. Take photos of the
damage, if possible. The owner must provide reasonable
evidence that the damage did not occur after delivery.
[ ] Notify the appropriate Trane office before installing or re-
pairing a damaged unit.
Unit Clearances
Figure 3-1 illustrates the minimum operating and service
clearances for either a single, multiple, or pit application.
These clearances are the minimum distances necessary to
assure adequate serviceability, cataloged unit capacity, and
peak operating efficiency.
Providing less than the recommended clearances may re-
sult in condenser coil starvation or recirculation of hot con-
denser air.
Locate the unit as close to the applicable system support
equipment as possible, to minimize refrigerant piping
lengths.
Unit Dimensions & Weight Information
Overall unit dimensional data for each unit is illustrated in
Figure 3-2.
A Center-of-Gravity illustration and the dimensional data is
shown in Figure 3-3.
Table 3-1 lists the typical unit operating and point loading
weights.
Foundation
If the unit is installed at ground level, elevate it above the
snow line. Provide concrete footings at each support loca-
tion or a slab foundation for support. Refer to Table 3-1 for
the unit operating and point loading weights when con-
structing the footing foundation.
Anchor the unit to the footings or slab using hold down bolts
or isolators. Isolators should be installed to minimize the
transmission of vibrations into the building. Refer to the
“Unit Isolation” section for spring or rubber isolator installa-
tion instructions.
For rooftop applications, ensure the roof is strong enough to
support the unit. Refer to Table 3-1 for the unit operating
weights.
Anchor the unit to the roof with hold-down bolts or isolators.
Follow the instructions under “Unit Isolation” for proper iso-
lator placement and installation.
Check with a roofing contractor for proper waterproofing
procedures.

7
Installation (Continued)
Figure 3-1
Typical Installation Clearances for Single, Multiple or Pit Applications

8
Figure 3-2
CAUC-C20 Unit Dimensional Data & Recommended Clearances

9
Figure 3-2 (Continued)
CAUC-C25 Unit Dimensional Data & Recommended Clearances

10
Figure 3-2 (Continued)
CAUC-C30 Unit Dimensional Data & Recommended Clearances