Trane SCWH, SCRH User Manual

4.5 (2)

Installation, Operation, and

Maintenance

Midrange Self-Contained Units

Models SCWH/SCRH 3, 5, 7.5, 10, 12, & 15-tons

“AO” and later design sequence

October 2008

PKG-SVX14A-EN

general information

About This Manual

Literature Change History

Use this manual for commercial selfcontained models SCWH and SCRH. This is the original issue of this manual. It provides specific installation, owner maintenance, and diagnostic

troubleshooting instructions for “AO” and later design sequences.

Note: The procedures discussed in this manual should only be performed by qualified, experienced HVAC technicians.

Note: This document is customer property and must be retained for use by maintenance personnel.

It is important to perform periodic maintenance to help ensure trouble free operation. Should equipment failure occur, contact a qualified Trane service organization for an experienced HVAC technician to properly diagnose and repair this equipment.

Warnings and Cautions

Warnings and cautions appear at appropriate sections throughout this manual. Read these carefully.

WARNING

Indicates a potentially hazardous situation, which could result in death or serious injury if not avoided.

CAUTION

Indicates a potentially hazardous situation, which may result in minor or moderate injury if not avoided. Also, it may alert against unsafe practices.

CAUTION

Indicates a situation that may result in equipment or property-damage-only accidents.

Example Warnings and

Cautions

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing.Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

CAUTION

Use Copper Conductors Only!

Unit terminals are not designed to accept other type conductors. Failure to use copper conductors may result in equipment damage.

Common HVAC Acronyms

For convenience, a number of acronyms and abbreviations are used throughout this manual. These acronyms are alphabetically listed and defined below. CFM = Cubic-feet-per-minute

CKT. = Circuit

CV = Constant volume CW = Clockwise

CCW = Counterclockwise E/A = Exhaust air

F/A = Fresh air

HGBP = Hot gas bypass

HVAC = Heating, ventilation and air conditioning

IGV = Inlet guide vanes I/O = Inputs/outputs

IOM= Installation/operation/maintenance manual

LH = Left-hand O/A = Outside air

psig = Pounds-per-square-inch, gauge pressure

R/A = Return air RH = Right-hand

RPM = Revolutions-per-minute S/A = Supply air

SZ = Single-zone (unit airflow) VAV = Variable air volume w.c. = Water column

Special Note on Refrigeration Emissions

World environmental scientists have concluded that ozone in our upper atmosphere is being reduced due to the release of CFC fully halogenated compounds.

Trane urges all HVAC service personnel to make every effort to prevent any refrigerant emissions while installing, operating, or servicing equipment. Always conserve refrigerants for continued use.

2© 2008 Trane All rights reserved

PKG-SVX14A-EN

contents

Cross reference to related publications/information:

Midrange Self-Contained catalog, PKG-PRC012-EN

Installation…………………………………………………2

general information ……………………………………………2

pre-installation considerations ………………………………6

dimensions & weights ………………………………………11

mechanical requirements ……………………………………17

electrical requirements ………………………………………19

installation procedure ………………………………………21

pre-startup requirements ……………………………………22

startup …………………………………………………………23

Operation…………………………………………………24

sequence of operation ………………………………………24

Maintenance ……………………………………………25

general information …………………………………………25

maintenance procedures ……………………………………26

periodic checklists ……………………………………………29

troubleshooting ………………………………………………30

typical wiring diagrams ……………………………………32

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3

general Installation information

Midrange Model Number Description

Following is a complete description of the midrange model number. Each digit in the model number has a corresponding code that identifies specific unit options.

S

C

W H

075

4

2

A0

1

0

1

0

1

2

3

4

567

8

9

1011

12

13

14

15

Digit 1 - unit model

 

 

 

 

 

Digit 8 - unit voltage

 

 

 

 

 

3

= 208 - 230 volt/60 hz/3 ph

S = self contained

 

 

 

 

 

4

= 460 volt/60 hz/3 ph

Digit 2 - unit type

 

 

 

 

 

5

= 575 volt/60 hz/3 ph

 

 

 

 

 

 

 

C = commercial

 

 

 

 

 

Digit 9 - air flow configuration

Digit 3 - condenser medium

 

 

2

= vertical discharge / front return

 

 

3

= vertical discharge / rear return

R = remote air-cooled

 

 

 

 

W = water cooled

 

 

 

 

 

Digit 10, 11 - design sequence

Digit 4 - development sequence

 

 

A0 = design sequence

 

 

 

 

H = development series

 

 

 

Digit 12 - air filter type

Digit 5, 6, 7- unit nominal capacity

 

1

= one-inch fiberglass throwaway

 

 

 

030 = 3 tons

 

 

 

 

 

 

Digit 13 - control

050 = 5 tons

 

 

 

 

 

 

0

= control interface

075 = 7.5 tons

 

 

 

 

 

 

 

 

100 = 10 tons

120 = 12 tons

150 = 15 tons

Digit 14 - unit finish

1 = painted

2 = corrosion resistant coating

Digit 15 - coil finish/Cu-Ni Condenser

0 = none

E = evaporator coated (SCRH)

J = Cupronickel condenser & Evaporator coated (SCWH)

Unit Airflow Configurations

unit size

discharge

fan location

comments

030/050/075

vertical CCW

top

standard

 

horizontalCW

top

field converted

100/120/150

vertical CCW

top

standard

 

vertical CW

top

field converted

 

horizontalCW

top

 

 

vertical CW

rear

 

 

horizontalCW

rear

 

 

horizontalCCW

rear

 

4

PKG-SVX14A-EN

general Installation information

General

The midrange models SCWH/SCRH is a high efficiency, vertical air

condioner. units have either front or top discharge configuration options and easy service access. Unit construction is heavy gage steel with a baked enamel finish. Available unit voltages are 208/3/60, 230/ 3/60, 460/3/60, and 575/3/60.

Refrigeration Circuits

Units are configured in single or double refrigeration circuits. Each circuit consists of:

high efficiency scroll compressor mounted on rubber isolation grommets

evaporator coils designed for optimum performance and efficiency with lanced fins and rifled tubing

filter-drier

Evaporator Section

The evaporator fan section consists of one or two forward curved centrifugal fans powered by a premium efficiency motor through an adjustable motor sheave and fixed diameter blower pulley.

Controls

The standard control panel consists of a high voltage terminal block, overload relays for each fan motor, transformer, 3- pole 24-volt contactors for eachmotor and compressor, and a 5-second delay timer. Remote thermostat controls are field installed.

Field-Installed Accesories

These items ship separately for field installation:

steam coil

hot water coil

plenum

oversized motors

remote thermostat

Note: Application of the above options and/or accessories may require field adjustment of fan speeds to ensure proper airflow and performance.

Unit Nameplate

The unit nameplate identifies the unit model number, appropriate service literature, and wiring diagrm numbers. It is mounted on the control panel door. Reference this information when making inquires or ordering parts or literature.

Refrigerant Handling

Procedures

Environmental Accountability Policy

Trane urges that all HVAC servicers to make every effort to eliminate, if possible, or vigorously reduce the emission of CFC, HCFC, and HFC refrigerants to the atmosphere. Always act in a responsible manner to conserve refrigerants for continued usage even when acceptable alternatives are available.

Recover and Recycle Refrigerants

Never release refrigerant to the atmosphere! Always recover and/or recycle refrigerant for reuse, reprocessing (reclaimed), or properly dispose if removing from equipment. Always determine the recycle or reclaim requirements of the refrigerant before beginning the recovery procedure. Obtain a chemical analysis of the refrigerant if necessary. Questions about recovered refrigerant and acceptable refrigerant quality standards are addressed in ARI Standard 700.

Refrigerant Handling and Safety

Consult the manufacturer’s material safety data sheet (MSDS) for information on refrigerant handling to fully understand health, safety, storage, handling, and disposal requirements. Use the approved containment vessels and refer to appropriate safety standards. Comply with all applicable transportation standards when shipping refrigerant containers.

Service Equipment and Procedures

To minimize refrigerant emissions while recovering refrigerant, use the manufacturer’s recommended recycling equipment per the MSDS. Use equipment and methods which will pull the lowest possible system vacuum while recovering and condensing refrigerant. Equipment capable of pulling a vacuum of less than 1,000 microns of mercury is recommended.

Do not open the unit to the atmosphere for service work until refrigerant is fully removed/recovered. When leak-testing with trace refrigerant and nitrogen, use HCFC-22 (R-22) rather than CFC-12 (R- 12) or any other fully-halogenated refrigerant . Be aware of any new leak test methods which may eliminate

refrigerants as a trace gas. Perform evacuation prior to charging with a vacuum pump capable of pulling a vacuum of 1,000 microns of mercury or less. Let the unit stand for 12 hours and with the vacuum not rising above 2,500 microns of mercury.

A rise above 2,500 microns of mercury indicates a leak test is required to locate and repair any leaks. A leak test is required on any repaired area.

Charge refrigerant into the equipment only after equipment does not leak or contain moisture. Reference proper refrigerant charge requirements in the maintenance section of this manual to ensure efficient machine operation. When charging is complete, purge or drain charging lines into an approved refrigerant container. Seal all used refrigerant containers with approved closure devices to prevent unused refrigerant from escaping to the atmosphere. Take extra care to properly maintain all service equipment directly supporting refrigerant service work such as gauges, hoses, vacuum pumps, and recycling equipment .

When cleaning system components or parts, avoid using CFC-11 (R-11) or CFC113 (R-113). Use only cleaning-solvents that do not have ozone depletion factors. Properly dispose of used materials. Refrigeration system cleanup methods using filters and driers are preferred. Check for leaks when excessive purge operation is observed.

Keep abreast of unit enhancements, conversion refrigerants, compatible parts, and manufacturer’s recommendations that will reduce refrigerant emissions and increase equipment operating efficiencies.

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5

pre-installation Installation considerations

Pre-Installation Considerations

Pre-Installation Checklist

Complete the following checklist before beginning unit installation.

Verify the unit size and tagging with the unit nameplate.

Make certain the floor or foundation is level, solid, and sufficient to support the unit and accessory weights. Level or repair the floor before positioning the unit if neccesary.

Allow minimum recommended clearances for routine maintenance and service. Refer to unit submittals for dimensions.

Allow three fan diameters above the unit for the discharge ductwork. Return air enters the rear of the unit and conditioned supply air discharges through the top.

Electrical connection knockouts are on the top, left side of the unit.

Allow adequate space for piping access and panel removal. Condenser water piping, refrigerant piping, and condensate drain connections are on the lower left end panel.

Electrical supply power must meet specific balance and voltage requirements as described in the “Electrical Requirements” section.

Water-cooled units only: The installer is responsible for providing a condenser main, standby water pump, cooling tower, pressure gauges, strainers, and all components for waterside piping. See the “Water Piping” section for general waterside recommendations.

Air-cooled units only: The installer is responsible for providing and installing the remote air-cooled condenser and refrigerant piping, including filter driers.

Receiving and Handling

Shipping Package

Midrange units ship assembled on skids. Units ship assembled, piped, and charged with either R410a (model SCWH)

or a dry nitrogen charge (model SCRH).

Receiving Checklist

Complete the following checklist immediately after receiving unit shipment to detect possible shipping damage.

Inspect individual cartons before accepting. Check for rattles, bent carton corners, or other visible indications of shipping damage.

If a unit appears damaged, inspect it immediately before accepting the shipment. Make specific notations concerning the damage on the freight bill. Do not refuse delivery.

Inspect the unit for concealed damage before it is stored and as soon as possible after delivery. Report concealed damage to the freight line within the allotted time after delivery. Check with the carrier for their allotted time to submit a claim.

Do not move damaged material from the receiving location. It is the receiver’s responsibility to provide reasonable evidence that concealed damage did not occur after delivery.

Do not continue unpacking the shipment if it appears damaged. Retain all internal packing, cartons, and crate. Take photos of damaged material if possible.

Notify the carrier’s terminal of the damage immediately by phone and mail. Request an immediate joint inspection of the damage by the carrier and consignee.

Notify your Trane representative of the damage and arrange for repair. Have the carrier inspect the damage before making any repairs to the unit.

Unit Storage

Take precautions to prevent condensate from forming inside the electrical compartments and motors if the unit is stored before it is installed.

Service Access

Maintain adequate clearances around and above the unit to ensure proper unit operationa nd allow sufficient service accesss. Trane recommends 36-inches service access on all sides fo the unit. Service access locations are shown in figures on pages 8 through 9.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Installation Preparation

Before installing the unit, perform the following procedures to ensure proper unit operation.

1.Verify the floor or foundation is level. Shim or repair as necessary. To ensure proper unit operation, install the unit level in both horizontal axes.

2.Allow adequate service and code clearances as recommended in “Service Access” section. Position the unit and skid assembly in its final location. Test lift the unit to determine exact unit balance and stability before hoisting it to the installation location. See the “Proper Lifting Procedure” section for proper rigging procedures and cautions.

3.Remove the skids from under the unit. If you find internal damage, file a claim immediately to the delivering carrier.

4.Remove the protective shipping covers from the unit.

5.Verify the compressor isolator shipping brackets are removed and the isolators are properly tightened for operation.

6

PKG-SVX14A-EN

pre-installation Installation considerations

Service Access

3 through 7.5-ton SCRH/SCWH

LATCH

THIS PANEL GOES TO TOP ON

HORIZONTAL AIR DISCHARGE

CONFIGURATION

HEATER

ACCESS

PROVIDED DISASSEMBLED

(FOR FIELD-INSTALLED REAR RETURN)

10 through 15-ton SCWH/SRCH with top-mounted fan configuration

FAN ACCESS

 

 

24"

 

24"

 

 

 

 

COIL / ELECTRIC HEATER

 

 

 

ACCESS

 

 

 

FRONT RETURN

 

 

 

 

MOTOR / DRIVE ACCESS

 

 

 

(RIGHT SIDE)

 

 

CONTROL BOX &

 

 

 

CONDENSER FAN ACCESS

 

 

 

TXV ACCESS

 

 

 

(RIGHT SIDE)

 

AIR FILTER ACCESS

 

UNIT-MOUNTED T-STAT

 

 

 

 

(BOTH SIDES)

 

OPENING (BOTH SIDES)

 

 

 

 

26" SERVICE CLEARANCE

DRAIN CONNECTION

26" SERVICE CLEARANCE

 

RIGHT SIDE

 

 

(BOTH SIDES)

RIGHT SIDE

POWER ENTRY

 

 

 

 

 

(BOTH SIDES)

 

 

 

CONTROL ENTRY

 

 

 

(BOTH SIDES)

 

 

 

 

18" SERVICE CLEARANCE

 

42" SERVICE CLEARANCE FRONT

 

REAR

 

 

26" SERVICE CLEARANCE

REAR RETURN

26" SERVICE CLEARANCE

COMPRESSOR ACCESS

LEFT SIDE

 

 

 

LEFT SIDE

SIGHT GLASS/FILTER DRIER ACCESS (RIGHT SIDE)

PKG-SVX14A-EN

7

Trane SCWH, SCRH User Manual

pre-installation Installation considerations

Service Access

10 through 15-ton SCRH/SCWH

10, 12, & 15-ton SCWH/SRCH with side-mounted fan configuration, field converted

8

 

PKG-SVX14A-EN

 

Isolator Placement

Note: Isolators are field-provided.

pre-installation Installation considerations

Table I-PC-1. Isolator load points, units with a vertical discharge configuration, lbs.

model

L1

L2

L3

L4

L1

L2

L3

L4

 

 

SCRB/SIRB

 

 

SCWB/SIWB

 

 

 

 

 

 

 

 

 

 

 

 

3-ton

99

105

120

127

105

133

118

124

 

5-ton

115

122

157

166

129

165

166

165

 

7.5-ton

154

203

227

221

177

234

230

231

 

10-ton

208

266

273

253

263

334

293

300

 

15-ton

243

332

359

356

315

388

382

375

 

Table I-PC-2. Isolator load points, units with a horizontal discharge configuration, lbs.

model

L1

L2

L3

L4

L1

L2

L3

L4

 

 

SCRB/SIRB

 

 

SCWB/SIWB

 

 

 

 

 

 

 

 

 

 

 

 

7.5-ton

250

108

313

135

285

126

319

140

 

10-ton

318

150

363

169

383

211

383

211

 

15-ton

404

166

510

210

514

215

514

215

 

Table I-PC-3. Isolator load points & types, units with a horizontal discharge, inverted “L” configuration, lbs.

 

 

air-cooled models

 

water-cooled models

 

L1

L2

L3

L4

L1

L2

L3

L4

10-tonunit

 

 

 

 

 

 

 

 

318

150

363

169

383

211

383

211

spring

red

yellow

red

yellow

red

yellow

red

yellow

rubber-in-shear

green

red

green

red

green

red

green

red

 

 

 

 

 

 

 

 

 

15-tonunit

404

166

510

210

514

215

514

215

spring

purple

yellow

purple

yellow

purple

yellow

purple

yellow

 

 

 

 

 

 

 

 

 

rubber-in-shear

gray

red

gray

red

gray

red

gray

red

Note: Units ship with two different color isolators and should be placed as depicted in this chart to properly support the unit weight. See Figures I-PC-1 & I-PC-2 for correct isolator positions by unit size.

 

3, 5, & 7.5-ton units

 

 

 

 

 

 

 

 

10 & 15-ton units

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

bottom view of unit

 

 

 

 

 

 

 

 

bottom view of unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L1

L3

 

 

 

 

 

L1

L3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L2

L4

 

 

 

 

 

 

L2

L4

 

 

 

 

 

 

 

 

 

 

1 7/8

 

 

 

1 3/8

 

 

 

 

 

 

 

 

 

 

 

 

 

7/8” dia. hole under all 4 corners

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9/16” dia. hole under all 4 corners

 

 

 

 

 

 

 

 

1 7/8

 

 

 

 

3 3/4

 

 

Figure I-PC-1. Isolator mounting hole locations on 3, 5, &

Figure I-PC-2. Isolator mounting hole locations on 10 & 15-

7.5-ton units

 

 

 

 

 

 

 

ton units

 

 

 

 

 

 

PKG-SVX14A-EN

9

pre-installation Installation considerations

WARNING

Improper Unit Lift!

Test lift unit approximately 24 inches high to verify the proper center-of- gravity lift point. To avoid dropping the unit, reposition the lifting point if the unit is not level. Failure to properly lift the unit could result in death, serious injury, or possible equipment/ property-only damage.

Proper Lifting Procedure

Follow these instructions and reference Figure I-PC-3.

1. Slide a fork lift into the opening provided on the unit base. Move the fork lift carefully.

2. Using slings, attach through the circular holes provided on the unit base. Protect the unit from damage by rigging equipment.

Figure I-PC-3. Proper unit lifting procedure

10

PKG-SVX14A-EN

dimensions & Installation weights

3 & 5-tons

SCWH/SCRH

vertical discharge

horizontal discharge (field converted)

SCRH

SCWH

SCWH/SCRH dimensions & weight, in-lbs.

unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

shipping

operating

size

A

B

C

D

E

F

G

J

K

L

M

N

O

P

Q

R

S

weight

weight

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

31.89

64.17

22.24

5.65

11.93

14.31

10.63

18.00

7.80

7.80

15.60

15.63

20.20

6.28

4.33

8.58

4.37

494

459

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

36.41

75.98

24.01

7.73

13.03

15.65

11.61

20.31

12.32

8.66

20.98

18.58

24.20

7.10

5.43

6.38

7.12

592

555

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PKG-SVX14A-EN

11

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