Trane SCWH, SCRH User Manual

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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 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

PKG-SVX14A-EN 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 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)

Digit 1 - unit model

S = self contained

Digit 2 - unit type

C = commercial

Digit 3 - condenser medium

R = remote air-cooled W = water cooled

Digit 4 - development sequence

H = development series

Digit 5, 6, 7- unit nominal capacity

030 = 3 tons 050 = 5 tons 075 = 7.5 tons 100 = 10 tons 120 = 12 tons 150 = 15 tons

Digit 8 - unit voltage

3 = 208 - 230 volt/60 hz/3 ph 4 = 460 volt/60 hz/3 ph 5 = 575 volt/60 hz/3 ph

Digit 9 - air flow configuration

2 = vertical discharge / front return 3 = vertical discharge / rear return

Digit 10, 11 - design sequence

A0 = design sequence

Digit 12 - air filter type

1 = one-inch fiberglass throwaway

Digit 13 - control

0 = control interface

Unit Airflow Configurations

unit size discharge fan location comments

030/050/075 vertical CCW top standard

100/120/150 vertical CCW top standard

horizontal CW top field converted

vertical CW top field converted horizontal CW top vertical CW rear horizontal CW rear horizontal CCW rear

4 PKG-SVX14A-EN

general

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, 3pole 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.

Installation

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

information

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.

PKG-SVX14A-EN 5

pre-installation

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).

Installation

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.

considerations

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

Service Access

3 through 7.5-ton SCRH/SCWH

Installation

LATCH

PROVIDED DISASSEMBLED (FOR FIELD-INSTALLED REAR RETURN)

considerations

THIS PANEL GOES TO TOP ON HORIZONTAL AIR DISCHARGE CONFIGURATION

HEATER ACCESS

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

FAN ACCESS

AIR FILTER ACCESS

(BOTH SIDES)

DRAIN CONNECTION

(BOTH SIDES)

24"

26" SERVICE CLEARANCE LEFT SIDE

SIGHT GLASS/FILTER DRIER ACCESS

(RIGHT SIDE)

42" SERVICE CLEARANCE FRONT

COMPRESSOR ACCESS

COIL / ELECTRIC HEATER ACCESS

FRONT RETURN

CONTROL BOX & CONDENSER FAN ACCESS

26" SERVICE CLEARANCE RIGHT SIDE

MOTOR / DRIVE ACCESS (RIGHT SIDE)

TXV ACCESS (RIGHT SIDE)

UNIT-MOUNTED T-STAT

OPENING (BOTH SIDES)

POWER ENTRY (BOTH SIDES)

CONTROL ENTRY (BOTH SIDES)

PKG-SVX14A-EN 7

24"

26" SERVICE CLEARANCE LEFT SIDE

18" SERVICE CLEARANCE REAR

REAR RETURN

26" SERVICE CLEARANCE RIGHT SIDE

pre-installation

Service Access

10 through 15-ton SCRH/SCWH

Installation

considerations

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

8 PKG-SVX14A-EN

pre-installation

Isolator Placement

Note: Isolators are field-provided.

Installation

considerations

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

model L1 L2 L3 L4 L1 L 2 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 L 2 L3 L4 L1 L 2 L 3 L 4

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.

10-ton unit 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-ton unit 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

bottom view of unit

L2 L4

/8” dia. hole under all 4 corners

1 7/

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

7.5-ton units

air-cooled models water-cooled models

L1 L2 L3 L4 L1 L2 L3 L4

10 & 15-ton units

bottom view of unit

L2 L4

/16” dia. hole under all 4 corners

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

1 3/

3 3/

PKG-SVX14A-EN 9

pre-installation

WARNING

Improper Unit Lift!

Test lift unit approximately 24 inches high to verify the proper center-ofgravity 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.

Installation

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.

considerations

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

3 & 5-tons SCWH/SCRH

vertical discharge

dimensions & weightsInstallation

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

dimensions &

7.5-tons SCWH/SCRH

Installation

vertical discharge

weights

horizontal discharge

(field converted)

SCWH

SCWH/SCRH weight, lbs.

unit shipping operating size weight weight

7.5 702 657

12 PKG-SVX14A-EN

SCRH

10, 12, & 15-tons with top-mounted fan configuration SCWH/SCRH

dimensions & weightsInstallation

vertical discharge

horizontal discharge

(field converted)

SCWH

SCWH/SCRH dimensions & weight, in-lbs.

unit shipping operating tons A B C D E F G J K M N weight weight

10 66.75 88.78 7.04 18.07 57.28 19.01 25.0 5.23 7.485/88.3 0 984 917

12 65.75 92.71 7.04 18.07 61.22 22.95 29.01 5.23 7.485/812.24 977 907

15 80.31 92.71 19.83 19.83 61.22 22.95 29.01 4.76 5.123/412.24 1098 1021

PKG-SVX14A-EN 13

SCRH

10, 12, & 15-tons with side-mounted fan configuration, field converted SCWH/SCRH

dimensions & weightsInstallation

SCWH/SCRH Dimensions, in.

unit tons A C D E F G

10 65.75 7.04 18.07 57.28 66.93 25.79

12 65.75 7.04 18.07 61.22 66.93 29.73

15 80.31 19.83 19.83 61.22 81.49 29.73

Notes:

1. Base rail must be attached to the floor before converting unit to side-mounted fan configuration.

2. Coil or electric heater cannot be assembed inside the cabinet with the side-mounted fan configuration.

14 PKG-SVX14A-EN

Plenum

Hot water coil 3 & 5-ton units

5.91

dimensions & weightsInstallation

Plenum dimensions & weight, in-lbs.

unit size A B weight

3-ton 31.89 22.24 44

5-ton 36.41 24.01 54

7.5-ton 40.94 28.74 73

10 & 12-ton 65.75 29.52 120

15-ton 80.31 29.52 146

1.57

0.59

3.15

1.38

1.0 NPT

0.28

0.75

0.39

0.59

1.03

0.39

0.75

5.9

2.18

8.39

2.18

1.03

1.08

SCWH/SCRH Hot water coil dimensions & weights, 3 & 5-ton units, in-lbs.

size A B C D E F G weight

3-ton 26.46 18.98 25.67 5.79 5.79 10.00 12.76 13

5-ton 30.98 23.50 30.20 7.040 7.040 12.50 15.26 18

PKG-SVX14A-EN 15

dimensions & weightsInstallation

Hot water coil

7.5-ton units

0.75

17.00

0.75

Hot water coil 10 thru 15-ton units

1.38

1.0 NPT

0.39

1.38

0.43

2.22

16.25

2.22

20.7

0.39

35.51

28.035.91

34.72

0.75

5.9

SCWH/SCRH Hot water coil dimensions & weights, in-lbs.

size A B C D weight

7.5-ton - - - - 24

10-ton 58.72 50.98 6.95 59.51 49

12-ton 58.72 50.98 6.95 59.51 49

15-ton 73.29 63.98 8.52 74.07 55

0.75

1.57

0.39

0.599.54

1.87

0.28

1.87

1.03

1.08

1.03

0.39

8.48

0.39

1.03

3.15

1.55

14.64

1.55

3.03

1.03

1.08

2.18

20.26

1.38

0.43

1.00 NPT

17.50

8.27

0.28

9.54

0.59

7.48

0.75

5.90

BLOCKOFF (SHIPS DISASSEMBLED)

1.57

0.75

15.89

2.18

9.07

3.19

16 PKG-SVX14A-EN

mechanical

Duct Connections

Install all air ducts according to the National Fire Protection Association standards for the “Installation of Air Conditioning and Ventilation Systems other than Residence Type (NFPA 90A) and Residence Type Warm Air Heating and Air Conditioning Systems (NFPA 90B).

Make duct connections to the unit with a flexible material such as heavy canvas. If a fire hazard exists, Trane recommends using Flexweave 1000, type FW30 or equivalent canvas. Use three inches for the return duct and three inches for the discharge duct. Keep the material loose to absorb fan vibration.

Run the ductwork straight from the opening for a minimum of three fan diameters. Do not make abrupt turns or transitions near the unit due to increased noise and excessive static losses. Use elbows with splitters or turning vanes to minimize static losses.

Poorly constructed turning vanes may cause airflow generated noise. Check total external static pressures against fan characteristics to be sure the required airflow is available throughout the ductwork.

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

Water Piping

Condenser Connections

Note: To prevent water damage, install piping drain and vent plugs.

Condenser water piping knockouts are in the lower left end panel. If necessary, remove insulation to gain access. All field installed piping must conform to applicable local, state, and federal codes. To complete condenser water connections follow the procedure below.

1. Remove back panel to access the water connection fittings.

2. Attach the water supply line to the inlet connection, and the return line to the outlet connection. The water connection fittings are copper, so exercise extreme care when connecting steel piping to copper fittings.

3. Ensure that water piping is aligned to the unit connection fittings. Failure to align piping could cause stripped threads, leakage, and possible unit failure.

4. Connection to the unit water piping requires a backing wrench to prevent distortion of connecting tubing. Apply backing wrench to water connection points on unit.

Condensate Drain Connections

Install a water regulating valve in the water supply line to maintainhead pressure when operating with city water of varying temperature.

These units require a minimum water pressure of 15 psig and will operate at a maximum of 400 psig.

Provide safeguards against cold weather drain line freeze.

requirements

Cooling Tower Piping

Cooling tower control affects the unit cycle rates. Condenser water temperature swings from 10-15°F may cause excessive compressor, water valve, and unit cycling. Be sure to set the tower controls to minimize compressor/ unit cycling.

The cooling tower system requires a separate drain in the water supply line for service and repair.

Water Temperature Requirements

Install a water regulating valve in the water supply line to maintain head pressure when operating with water of varying temperature. The valve modulates condenser water flow to control condensing pressure. The valve opens or closes in response to compressor discharge pressure as sensed by its capillary line connection iin the liquid line shrader valve. When the valve is properly installed, water flow automatically decreases as discharge pressure falls and increases as discharge pressure rises. Field installation of the water regulating valve assembly requires one valve for each refrigeration circuit.

PKG-SVX14A-EN 17

mechanical requirementsInstallation

Refrigerant Piping (Air-Cooled Units Only)

Reference industry recommendations for air-cooled unit refrigerant piping. If suspending piping from the building, use isolation hangers to prevent vibration transmission.

Air-cooled units ship with a holding charge of nitrogen. Before installing unit piping, momentarily depress either the suction or discharge line access valve to verify that the holding charge has not been lost. If nitrogen does not escape when depressing the access valve, leaktest the entire refrigerant system to determine the source of loss.

The charge is contained by a continuous loop of both hot gas and liquid lines. You must cut the loop for connection to discharge and liquid lines. See Figure IMR-1.

WARNING:

Hazard of Explosion and Deadly

Gases! 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. Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Brazing Procedures

Proper brazing techniques are essential when installing refrigerant piping. Keep the following factors in mind when making sweat connections.

1. When heating copper in the presence of air, copper oxide forms. To prevent copper oxide from forming inside the tubing during brazing, sweep an inert gas, such as dry nitrogen, through the tubing. Nitrogen displaces air in the tubing and prevents oxidation of interior surfaces. A nitrogen flow of one to three cubic feet per minute is sufficient to displace the air. Use a pressure regulating valve or flow meter to control the flow.

2. Ensure tubing surfaces that require brazing are clean and the ends of the tubes are carefully reamed to remove any burrs.

3. Make sure the inner and outer tubes of the joint are symmetrical and have a close clearance, providing an easy slip fit. If the joint is too loose, the tensile strength of the connection will be significantly reduced. Make the overlap distance equal to the inner tube diameter.

4. Wrap the body of each refrigerant line component with a wet cloth to keep it cool during brazing. Excessive heat can damage the components.

5. If using flux, apply it sparingly to the joint. Excess flux will contaminate the refrigerant system.

6. Apply heat evenly over the length and circumference of the joint, making sure the entire joint becomes hot enough to melt the brazing material.

Figure I-MR-1. Air-cooled unit refrigerant piping

7. Begin brazing when the joint is hot enough to melt the brazing rod. The hot copper tubing, not the flame, should melt the rod.

8. Continue to apply heat around the joint circumference until the brazing material is drawn into the joint by capillary action, making a mechanically sound and gas-tight connection.

9. Visually inspect the connection after brazing to locate any pin holes or crevices in the joint. Use a mirror to inspect connections that are difficult to see.

Electrical Requirements

Follow these guidelines, referring to unit wiring diagrams and supply power dimensional information to ensure correct electrical requirements at the installation site. Reference supply power wiring locations on unit submittals orin the “Dimensions and Weights” section. Specific unit wiring diagrams are provided on each unit. Use these diagrams for connections or trouble analysis.

Unit Wiring Diagrams

Specific unit wiring diagrams are provided on the inside of the control panel door. Use these diagrams for connections or trouble analysis.

18 PKG-SVX14A-EN

electrical requirementsInstallation

Supply Power Wiring

It is the installer’s responsibility to provide power supply wiring to the unit terminal block or the non-fused disconnect switch option. Wiring should conform to NEC and all applicable code requirements.

1. Verify the power supply available is compatible with the unit nameplate ratings. The supply power must be within 10%of the rated voltage listed on the unit nameplate.

2. Reference the electrical data in Table IER-1. Protect the electrical service from over current and short circuit conditions in accordance with NEC requirements. Size protection devices according to the electrical data on the unit nameplate.

3. If using a field-supplied disconnect, install it at or near the unit in accordance with NEC. Do not mount a field-supplied disconnect on the unit. Reference the electrical service entrance location on unit submittals.

4. Complete the unit power wiring connections onto either the main terminal block or the field-provided nonfushed disconnect switch.

WARNING

Ground Wire!

All field-installed wiring must be completed by qualified personnel. All field-installed wiring must comply with NEC and applicable local codes. Failure to follow this instruction could result in death or serious injuries.

WARNING

Grounding Required!

Follow proper local and state electrical code on requirements for grounding. Failure to follow code could result in death or serious injury.

5. Provide proper unit grounding in accordance with local and national codes.

Electrical Data Calculations

RLA = rated load amps Compressor LRA = locked rotor amps Fan motor LRA = locked rotor amps, N.E.C. Table 430 - 151 FLA = Full load amps, N.E.C.

Table 430 - 150

Voltage utilization range is ±10%

Minimum circuit ampacity (MCA) = 1.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.

Maximum fuse size (MFS) and maximum circuit breaker size (MCB) = 2.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.

Note: If the rating value determined does not equal a standard current rating of over current protective device, use the next lower standard rating for the marked maximum rating.

Voltage Range

Voltages must be within +- 10% the nameplate voltage. Ensure the unit voltage is balanced by measuring at the compressor terminals. Voltage imbalance on three phase systems can cause motor overheating and premature failure. Maximum allowable imbalance is 2.0%.

Voltage Imbalance

Read the voltage at the compressor terminals to determine if it is balanced. Voltage imbalance on three phase systems can cause motor overheating and premature failure. The maximum allowable imbalance is 2.0%. Voltage imbalance is defined as 100 times the sum of the deviation of the three voltages from the average (without regard to sign) divided by the average voltage. For example, if the three measured voltages are 221, 230, and 227, the average voltage would be:

(221 + 230 + 227) = 226 volts

The percentage of voltage imbalance is then:

(226-221) = 2.2%

100 *

226

In this example, 2.2% imbalance is not acceptable. Whenever a voltage imbalance of more than 2.0% exists, check the voltage at the unit disconnect switch. If the imbalance at the unit disconnect switch does not exceed 2.0%, faulty unit wiring is causing the imbalance. Conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.

WARNING

Live Electrical Components!

During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

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.

PKG-SVX14A-EN 19

electrical

Installation

requirements

Table I-ER-1. Model SCWH/SCRH electrical data

evaporator standard motor evaporator oversized motor

tons MFS / MCBmodel voltage

SC*H0303.... 208-230V/60Hz/3Ph 12.9 77.0

SC*H0304.... 460V/60Hz/3Ph 5.7 35.0 1.00 8.1 15 1.42 8.5 15

SC*H0305.... 575V/60Hz/3Ph 4.8 31.0 0.80 6.8 15 1.14 7.1 15

SC*H0503.... 208-230V/60Hz/3Ph 22.9 155.0 5.00 33.6 50 5.81 34.4 50

SC*H0504.... 460V/60Hz/3Ph 10.7 75.0 2.50 15.9 25 2.63 16.0 25

SC*H0505.... 575V/60Hz/3Ph 8.5 54.0 1.50 12.1 20 2.10 12.7 20

SC*H0753.... 208-230V/60Hz/3Ph 27.9 164.0 6.30 41.2 60 5.81 40.7 60

SC*H0754.... 460V/60Hz/3Ph 13.6 100.0 3.10 20.1 30 2.63 19.6 30

SC*H0755.... 575V/60Hz/3Ph 10.2 78.0 2.40 15.2 25 2.10 14.9 25

SC*H1003.... 208-230V/60Hz/3Ph 22.9 155.0 6.30 57.8 80 13.70 65.2 80

SC*H1004.... 460V/60Hz/3Ph 10.7 75.0 3.10 27.2 35 6.18 30.3 40

SC*H1005.... 575V/60Hz/3Ph 8.5 54.0 2.40 21.5 30 4.94 24.1 30

SC*H1203.... 208-230V/60Hz/3Ph 25.4 147.7 9.40 66.5 90 13.70 70.8 90

SC*H1204.... 460V/60Hz/3Ph 11.8 75.0 4.60 31.2 40 6.18 32.7 45

SC*H1205.... 575V/60Hz/3Ph 9.3 59.6 3.40 24.4 30 4.94 25.9 35

SC*H1503.... 208-230V/60Hz/3Ph 27.9 164.0 9.40 72.2 100 13.70 76.5 100

SC*H1504.... 460V/60Hz/3Ph 13.6 100.0 4.60 35.2 45 6.18 36.8 50

SC*H1505.... 575V/60Hz/3Ph 10.9 78.0 3.40 27.9 35 4.94 29.5 35

Notes:

1. Voltage range: Nominal voltage 208 - 230V - acceptable range: 187 - 253V Nominal voltage 460V - acceptable range: 414 - 506V Nominal voltage 575V - acceptable range: 518 - 633V

2. Ampacity is calculated per UL formula, ampacity = (1.25 x compressor RLA + sum of the second compressor RLA (if used) + evaporator motor FLA

3. Maximum fuse size is calculated per UL formula, MFS = (2.25 x compressor RLA) + sum of second compressor RLA (if used) + evaporator motor FLA

31 11

5111

7.5 1 2 1

10 2 2 1

12 2

15 2 3 1

compressor evap. fan motor

RLA LRA qty. hp FLA qty. hp FLA qty

0.5

2.21

31 51

min. circuit

acit

18.3 30 3.15 19.3 30

Hazardous Voltage!

Disconnect all electric power,

evap. fan motor

min. circuit

WARNING

MFS /

acit

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.

MCB

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.

20 PKG-SVX14A-EN

installation

Installation Checklist

Reference the checklist below to verify all steps required to successfully install a deluxe self-contained unit are complete. This checklist is intended to acquaint the installing personnel with what is required in the installation process. It does not replace the detailed instructions detailed in the applicable sections of this manual.

WARNING

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.

General Unit Requirements

Install and secure the ductwork to the

unit.

Check unit for shipping damage and

material shortage. Refer to the Receiving Checklist.

Electrical Requirements

Verify that the electrical power supply

characteristics comply with the unit nameplate specifications.

Inspect all control components; tighten

any loose connections.

Connect properly sized and protected

power supply wiring to a field supplied/ installed disconnect and unit power terminal block, or to the optional unit mounted disconnect switch.

Properly ground the unit.

Installation

Field Installed Control Wiring (Optional)

Complete the field wiring connections.

Note: All field installed wiring must comply with NEC and applicable local codes.

Fan Discharge Conversion

Complete the steps below to convert the fan discharge from vertical to horizontal.

1. Remove all mid and top fan section panels.

2. Loosen the brackets inside the unit that clamp the mid and fan sections together.

3. Remove the control box cover and disconnect the motor power wires. Feed wires up through the unit and secure out of the way until rotation is complete.

4. Rotate the fan section to desired position.

5. Re-route the motor power wires back to the control box. Ensure all wiring is free and not routed over any sharp edges.

procedure

6. Reconnect the motor power wires per the unit wiring diagram.

7. Bolt and/or clamp all brackets back into place.

8. Replace control box cover and all exterior panels.

9. Verify the fan rotation and motor amp draw.

Plenum Installation

1. Uncrate the plenum and accessory bag.

2. Rotate the evaporator blower to the vertical discharge configuration.

3. Apply the soft gasket provided around the aluminum frame on top of the unit as shown in Figure I-IP-1.

4. Using a screwdriver, tighten the selfdrilling screws as shown in Figure I-IP-

1. Be sure to tighten all screws on the rear, right, and left sides through the pilot holes on the plenum panels.

5. When installation is complete, adjust the motor pulley and the discharge grille for proper airflow.

Figure I-IP-1. Plenum installation

PKG-SVX14A-EN 21

pre-startup

Installation

Pre-Startup Checklist

Complete this checklist after installing the unit to verify all recommended installation procedures are complete before unit startup. This does not replace the detailed instructions in the appropriate sections of this manual. Always read the entire section carefully to become familiar with the procedures.

WARNING

Hazardous Voltage!

Disconnect all electrical 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.

Receiving Inspect unit and components for

shipping damage. File damage claims immediately with the delivering carrier.

Check nameplate unit data so that it

matches the sales order requirements.

Check unit for missing material. Look

for ship-with accessories that are packaged separately and placed inside the access panel, fan section, or compressor section. See the “Receiving and Handling” section.

requirements

Unit Location

Ensure the unit location is adequate for

unit dimensions, ductwork, piping, and electrical connections.

Ensure access and maintenance

clearances around the unit are adequate. See the “Service Access” section.

Unit Mounting

Remove shipping brackets on the

compressor assembly and supply fan.

Component Overview

Verify the fan and motor sheaves are

aligned.

Check the belt tension for proper

adjustment.

Ensure the fan rotates freely. Tighten locking screws, bearing set

screws and sheaves.

Ensure bearing locking collars do not

wobble when rotated.

Ensure all air filters are properly

installed with consideration of size and air flow.

Manually rotate the evaporator fan to

ensure free movement. Verify that all of the fan mounting hardware is tight.

Ductwork

Verify that all ductwork conforms to

NFPA 90A or 90B and all applicable local codes.

22 PKG-SVX14A-EN

Installation

startup

Unit Startup Procedures

1. Check all electrical connections for tightness.

2. Be sure all unit accessories are properly set and installed.

3. Model SCWH: Verify condenser water piping is properly connected, supply, and return.

4. Model SCRH: Verify refrigerant piping is properly connected, hot gas, and liquid.

5. Inspect all ductwork and duct connections.

6. Check for proper belt tension.

7. Check fan drive sheaves, pulleys, and bearings.

Unit Startup Checklist

1. Turn the thermostat to the OFF position.

2. Engage power supply by closing power disconnect.

3. Switch thermostat to fan position and adjust temperature setting below room temperature. Evaporator fan should start.

4. Check evaporator section for proper operation.

5. Switch thermostat to cool position and adjust temperature setting to below room temperature. The evaporator fan and compressor(s) should start.

7. Allow unit to run until all system temperatures and pressures stabilize.

WARNING

Hazardous Service Procedures !

The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects 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. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

Note: These units are equipped with high efficiency scroll compressors. Check for proper scroll rotation prior to operating unit.

WARNING

Hazardous voltage!

6. Check the evaporator fan for proper rotation. If fan rotation is incorrect, switch thermostat to Off position and disconnect power. Reverse two phase leads at disconnect and return back to Step 1 of startup.

PKG-SVX14A-EN 23

WARNING

Rotating Components!

During installation, testing, servicing and troubleshooting of this product it may be necessary to measure the speed of rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions when exposed to rotating components could result in death or serious injury.

8. Check systems for proper operation and performance. Observe unit in operation and check for unusual noise, vibration, belt, and fan clearances.

sequence of

Operation

Sequence of Operation

The thermostat controls the unit operation. It has both manual and automatic switches so the thermostat maintains desired comfort levels.

The fan switch allows manual selection of the fan speed using the On or Auto setting. With the switch set in the On position, the evaporator fan runs continously, independent from the thermostat temperature setting. The Auto position cycles the evaporator fan on and off with the demand for heating or cooling.

The system switch may have two or more positions. For example, using a cooling only thermostat, the system switch can be set in the Off or the Cool position. The Off position disconnects power from the thermostat contacts that control the condensing unit. This prevents

operation

the condensing unit from running, regardless of the thermostat temperature setting. The evaporator fan may circulate air if the fan switch is in the On position. With the switch in the Cool position, the condensing unit and evaporator will operate on a signal from the thermostat calling for cooling.

With the fan switch set to Auto and the system switch set to Cool, the following sequence takes place. On a rise in room temperature,t he thermostat contacts close to provide power to the evaporator fan contactor,t he condensing unit fan contactor,a nd the condensingunit compressor contactors. As the room temperature reaches setpoing, the thermostat contacts open to de-energize all contactors,a nd the system cycles off. This system will remain off until additional cooling is required and the cycle repeats.

24 PKG-SVX14A-EN

general

Maintenance

Table M-GI-1. Midrange maintenance general data

SCWH030 SCWH050 SCWH075 SCWH100 SCWH120 SCWH150 dimensions, in-lbs. height 66.93 78.74 78.94 91.54 95.47 95.47 length 31.89 36.41 40.94 65.75 65.75 80.31 depth 22.24 24.01 28.74 29.52 29.52 29.52 weight (shipping / net) 494 / 459 592 / 555 702 / 657 1094 / 1027 1133 / 1063 1249 / 1172 cooling performance net cooling capacity, btu/h 36000 65290 87570 116986 138204 167303 EER 12.13 12.28 11.6 11.5 11.1 11.3 nominal air flow, cfm 1200 2000 3000 4000 4800 6000 system power, kW 3.0 5.3 7.6 10.2 12.5 14.8 Copeland scroll compressor quantity 1 1 1 2 2 2 model ZP32 ZP57 ZP83 ZP57 ZP67 ZP83 indoor coil, 3/8" tube size face area, sq. ft. 3.19 4.98 7.13 12.12 12.12 14.56 rows / fpf 4 / 144 4 / 144 3 / 168 2 / 168 2 / 168 3 / 168 water condenser, tube & tube water connection, in. 3/4 NPT 3/4 NPT 3/4 NPT 1 1/4 NPT 1 1/4 NPT 1 1/4 NPT indoor fan, belt-driven quantity 1 1 2 2 2 2 diameter x width 9 x 9 10 x 10 9 x 9 12 x 12 12 x 12 12 x 12 motor 1 / 0.5 1 / 1.0 1 / 2.0 1 / 2.0 1 / 3.0 1 / 3.0 motor frame size 56 56 56 56 56 56 air filter, 1" throwaway

size / (quantity), in. 14 x 25 (1)

refrigerant, R-410A, TXV control refrigerant charge (Ckt 1 / 2), lbs. 3.8 5.4 7.8 5.1 / 5.2 6.5/6.3 7.2/7.2 hot water coil, 2-row, 108 fpf, 1/2" tubes face area, sq. ft. 1.42 2.08 3.27 6.2 6.2 7.78

14 x 20 (1) +

20 x 20 (1)

18 x 24 (2)

information

12 x 24 (1) + 24 x 24 (2)

18 x 24 (3) +

24 x 24 (1)

Notes:

1. Net cooling capacity is rated at 95°F ambient, 80°F entering dry bulb and 67°F entering wet bulb @ SCFM air condition.

2. EER is rated at ARI condition.

PKG-SVX14A-EN 25

maintenance

Maintenance Procedures

This section describes specific maintenance procedures that must be preformed as a part of the normal maintenance program. Always disconnect electrical power to the unit before performing these procedures and heed all warnings and cautions.

WARNING

Live Electrical Components!

During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical components could result in death or serious injury.

WARNING

Hazardous Voltage!

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

Periodic Maintenance Checklist

Inspect coil surface for cleanliness. Clean as required, referring to the “Coil Cleaning” section.

Annual Maintenance Checklist

Perform all monthly maintenance inspections. Perform seasonal startup checks. Leak test refrigerant circuits. Inspect contacts of fan motor contactors and relays. Replace all worn contacts. Clean and repaint any corroded surface.

Maintenance

Note: the following coil cleaning procedures apply only to the outdoor condensers. Do not use these procedures for the reheat or evaporator coils.

Cleaning the Condenser Coils

Clean the coil at least once each year or more frequently if located in a dirty environment, to help maintain proper unit operating efficiency. High discharge pressures are a good indication that the coil needs cleaning. Follow the detergent manufacturer instructions as closely as possible to avoid potential coil damage.

WARNING

Hazardous Chemicals!

Coil cleaning agents can be either acidic or highly alkaline.Handle chemical carefully. Proper handling should include goggles or face shield, chemical resistant gloves, boots, apron, or protective suit as required. For personal safety, refer to the cleaning agent manufacturer’s materials safety data sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.

To clean the refrigerant coil, use a soft brush and sprayer, such as a garden pump up or high pressure type . In addition, use a quality detergent; like “SPREX AC’, “ OAKITE 161” or “OAKITE 166” and “COILOX.”

Note: If detergent is strongly alkaline (i.e. has a pH value greater that 8.5 ) after mixing, you must add an aluminum corrosion inhibitor.

WARNING

Hazardous Voltage!

procedures

Coil Cleaning Procedure

1. Disconnect power to the unit.

2. Remove panels from the unit to gain access to the coil.

3. Use a soft brush to remove loose dirt and debris form both sides of the coil.

4. Straighten coil fins with fin comb as required.

5. Mix the detergent with water according to the manufacturers instructions.

Observe all recommendations of the cleanser manufacturer. The coil cleanser manufacturer’s recommendations, warnings and cautions will at all times take precedence to these instructions.

1. Place solution in the sprayer. Be sure to follow these guidelines if using a highpressure sprayer:

a) Keep minimum nozzle spray angle 15°. b) Spray solution at a 90° angle to the coil

face.

c) Keep sprayer nozzle at least six inches

from the coil.

d) Sprayer pressure must not exceed

600 psi.

2. Spray leaving air side of the coil first then spray the entering air side of the coil. Allow the detergent and water solution to stand on the coil for five minutes.

3. Rinse both sides of the coil with cool, clean water.

4. Inspect the coil. If it still appears dirty, repeat the cleaning procedure.

5. Reinstall all unit components and panels, and restore electrical power and gas supply to the unit.

CAUTION

Freezing Temperatures!

Do not allow liquid refrigerant to come into contact with the skin. If it does, treat the injury similar to frostbite. Slowly warm the ffected area with lukewarm water and seek immediate medical attention. Direct contact with liquid refrigerant may cause minor or moderate injury.

26 PKG-SVX14A-EN

maintenance

Refrigerant System

Special Note on Refrigerant Emissions

Follow the Trane recommended procedures on operation, maintenance, and service to ensure refrigerant conservation and emission reduction. Also, pay specific attention to the following:

• Whenever removing refrigerant from equipment, recover for reuse, recycle, reprocess (reclaim), or properly destroy it.

• Always determine possible refrigerant recycling or reclaiming requirements before beginning recovery. Questions about recovered refrigerants and acceptable refrigerant quality standards are addressed in ARI Standard 700.

• Use approved containment vessels and safety standards. Comply with all applicable transportation standards when shipping refrigerant containers.

• To minimize emissions while recovering refrigerant, use recycling equipment. Always attempt to use methods that pull the lowest possible system vacuum while recovering and condensing refrigerant into containment.

• When leak checking with trace refrigerant and nitrogen, use HCFC22 (R22) rather than CFC12 (R12) or any other fully halogenated refrigerants. Be aware of any new leak test methods that eliminate refrigerant as a trace gas.

• When cleaning system components or parts, do not use CFC11 (R11) or CFC113 (R113). Refrigeration system clean up methods using filters and dryers are recommended. Do not use solvents that have ozone depletion factors. Properly dispose of used materials.

• Take extra care to properly maintain all service equipment directly supporting refrigerant service work such as gauges, hoses, vacuum pumps, and recycling equipment.

• Stay aware of unit enhancements, conversion refrigerants, compatible parts, and manufacturer’s recommendations that reduce refrigerant emissions and increase equipment operating efficiencies. Follow specific manufacturer’s guidelines for conversion of existing systems.

Maintenance

• To assist in reducing power generation emissions, always attempt to improve equipment performance with improved maintenance and operations that will help conserve energy resources.

WARNING

Confined Space Hazards!

Do not work in confined spaces where sufficient quantities of refrigerant or other hazardous, toxic, or flammable gas may be leaking. Refrigerant or other gases could displace available oxygen to breathe, causing possible asphyxiation or other serious health risks. Some gases may be flammable and or explosive. Evacuate the area immediately and contact the proper rescue or response authority. Failure to take appropriate precautions or to react properly to a potential hazard could result in death or serious injury.

WARNING

Hazard of Explosion!

Use only dry nitrogen with a pressure regulator to pressurize the unit. Do not use acetylene, oxygen, compressed air, or mixtures containing them. 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. Failure to follow these recommendations could result in death, serious injury, equipment, or property-only damage.

WARNING

Leak Testing!

Do not exceed 200 psig when leak testing system. Failure to follow these instructions could result in an explosion causing death or serious injury.

procedures

In the event of required system repair, leak test the liquid line, evaporator coil, and suction line at pressures dictated by local codes, and using the following guidelines.

1. Charge enough refrigerant and dry nitrogen into the system to raise the pressure to 100 psig.

2. Use a halogen leak detector, halide torch, or soap bubbles to check for leaks. Check interconnecting piping joints, the evaporator coil connections, and all accessory connections.

3. If a leak is detected, release the test pressure, break the connections and reassemble it as a new joint, using proper brazing techniques.

4. If no leak is detected, use nitrogen to increase the test pressure to 150 psig and repeat the leak test. Also, use soap bubbles to check for leaks when nitrogen is added.

5. Retest the system to make sure new connections are solid.

6. If a leak is suspected after the system has been fully charged with refrigerant, use a halogen leak detector, halide torch, or soap bubbles to check for leaks.

Refrigerant Evacuation

For field evacuation, use a rotary style vacuum pump capable of pulling a vacuum of 100 microns or less.

When connecting the vacuum pump to a refrigeration system, it is important to manifold the pump to both the high and low side of the system. Follow the pump manufacturer’s directions.

WARNING

Use of Pressure Regulator – Valves – Gauges!

Always use pressure regulators, valves, and gauges to control drum and line pressures when pressure testing equipment. Failure to follow these instructions could result in an explosion causing death, serious injury, or equipment damage.

PKG-SVX14A-EN 27

maintenance

Maintenance

CAUTION

Motor Winding Damage!

Do not use a megohm meter or apply greater than 50 VDC to a compressor motor winding while it is under a deep vacuum. Voltage sparkover may cause damage to the motor windings.

WARNING

Hazardous Pressures!

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. Failure to follow these safety precautions could result in a violent explosion, which could result in death or serious injury.

procedures

Charging the Refrigerant System

To completely charge the system, charge gaseous refrigerant into the suction line shrader valve with the unit running. However, make sure that some refrigerant is present in each circuit before starting the compressors.

CAUTION Compressor Damage!

Do not allow liquid refrigerant to enter the suction line. Excessive liquid accumulation in the liquid lines may result in compressor damage.

CAUTION Compressor Damage!

Never manually or automatically pump down below 7 psig. This may cause the compressor to operate in a vacuum and result in compresor damage.

Table M-MP-1. Normal operation condition

water-cooled air-cooled high pressure 280 to 430 psig 320 to 570 psig low pressure superheat subcooling

Table M-MP-2. Controls adjustment

control disarming rearming

high pressure control (air-cooled & 12-ton water cooled) 624±17.5 psig 464±29 psig

high pressure control (water-cooled except 12-ton) low pressure contol 51±7 psig 94±7 psig

motor windings thermostat, standard motor only

28 PKG-SVX14A-EN

450±10 psig 348±14.5 psig

266±5F 194±5 3 / 204-230 & 575 275±5F 198 5 / 208-230 266±5F 198 5 / 575

194±5 F 135 7.5 - 10 / 208-230

248±5F 156 7.5 - 10 / 575

194±5F 135 12 - 15 / 208-230

221±5F 142 12 - 15 / 575

100 to 160 psig

4 to 9°F

5 to 10°F

unit (ton / voltage)

periodic

Periodic Checklists

Monthly Checklist

The following checklist provides the recommended maintenance schedule to keep the unit running efficiently.

WARNING

Hazardous Voltage!

1. Inspect unit air filters. Clean or replace if airflow is blocked or if filters are dirty.

2. Inspect coils for icing. Icing on the coils may indicate low airflow supply, restricted airflow from dirty fins.

3. Check the fan belt condition and tension. Adjust tension if belt is floppy or squeals continually.

4. Check and record operating pressures.

Semi-Annual Maintenance

1. Verify the fan motor is properly aligned and bolted tight to the motor frame.

2. Lubricate fan bearings.

3. With power disconnected, manually rotate the fan wheel to check for obstructions in the housing or

Maintenance

interference with fan blades. Remove obstructions and debris. Center the fan wheel if necessary.

4. Check the fan assembly sheave alignment. Tighten set screws to their proper torques.

Note: Perform this procedure monthly if the unit is in a coastal or corrosive environment.

Annual Maintenance

Check and tighten all set screws, bolts, locking collars and sheaves.

1. Inspect, clean, and tighten all electrical connections.

2. Visually inspect the entire unit casing for chips or corrosion. Remove rust or corrosion and repaint surfaces.

3. Visually check for leaks in refrigerant piping.

4. Inspect fan, motor, and control contacts. Replace badly worn or eroded contacts.

checklists

5. Inspect the thermal expansion valve sensing bulbs for cleanliness, good contact with the suction line, and adequate insulation from ambient air.

WARNING

Live Electrical Components!

During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical components could result in death or serious injury.

WARNING

Rotating Components!

PKG-SVX14A-EN 29

Maintenance

WARNING

Hazardous voltage!

Troubleshooting

Use the following steps and procedures to help correct these common problems.

injury.

troubleshooting

Problem

The entire unit does not operate.

Possible cause

1. Power interruption

2. Thermostat not operating

3. Electrical panel: a) 24-volt transformer defective; b) loose wire

Problem

Fan runs but compressor does not start.

Possible cause

1. Low voltage

2. Remote thermostat

3. Compressor contactor open or burned 4 .High pressure control cutting out unit

5. Refrigerant leak - no gas

6. Loose or defective wires.

7. Compressor shorted, open or burned

8. Defective compressor

Problem

Unit held off by safety.

Possible cause

1. Unit cutout on high pressure control, set at 385 psig

2. Refrigerant leak

3. Air restriction, dirty coils

4. Partial restriction in refrigerant system

5. High pressure control

6. TXV power element charge loss

7. Loose connection in electrical unit

Remedy

1. Check for blown fuses or tripped circuit breakers. Replace or reset if necessary.

2. Setting may be too high; check unit and reset. Thermostat may be out of calibration or otherwise defective; replace.

3. Correct as required.

Remedy

1. Check power supply for voltage outside the acceptable voltage range.

2. Check the control unit for loose wires. Firm any loose connections.

3. Replace.

4. Check for loose wire connection, broken or burned contacts. If defective, replace.

5. Locate leak and repair. Recharge unit.

6. Tug on wires to see if they will separate from connections. Replace terminals if necessary.

7. Check for shorts, opens, and grounded. Remove and replace compressor.

8. Remove and replace.

Remedy

1. Adjust tubes by bending slightly to firm position without touching other unit parts.

2. Level unit base. Fully support base.

3. Check and tighten loose screws.

4. Tighten screws on fan wheel shaft.

5. Adjust wheel position on motor shaft

6. Replace fan motor.

7. Replace fan bearing.

Problem

Noisy operation.

Possible cause

1. Copper tubing vibrating

2. Machine vibrating out of level

30 PKG-SVX14A-EN

Remedy

2. See if unit is low on refrigerant charge. Repair leak and recharge unit.

3. Verify if the air filter is dirty or has an airflow restriction, and correct problem.

4. Locate restriction by inspecting refrigerant lines for temperature changes. Remove restriction, evacuate, and recharge.

5. Replace, if defective.

6. Evacuate, replace element, recharge.

7. Trace and firm up connection.

Maintenance

troubleshooting

Problem

Insufficient cooling

Possible cause

1. Insufficient air flow due to: a) dirty evaporator; b) ice on evaporator coils (indicates airflow restriction through evaporator); c) dirty filter; d) obstructed discharge air intake; e) fan motor not running; f) evaporator fan or fan wheel slipping on motor shaft

2. Heat gain or loss in room exceeds unit capacity

3. Defective compressor

4. Insufficient refrigerant charge indicated by: a) low wattage; b) condenser air outlet cold

5. Overcharge of refrigerant indicated by high wattage and sweating of the compressor return line

6. Thermostat not set for full cooling

7. Insufficient airflow through condenser due to: a) dirty condenser; b) loose belt; c) fan loose on shaft

8. Cutout on high pressure

9. Only one refrigerant circuit operational in 2-circuit units

WARNING

Hazardous voltage!

Remedy

1. Correct as follows: a) clean; b) defrost (using fan operation only); c) clean or replace filter; d) remove obstruction; e) check electrical system; f) adjust fan position. Tighten set screw on fan wheel.

2. Refer to original load calculations. Recalculate heat gain or loss.

3. Replace, if necessary.

4. Check refrigerant charge pressure with gauges. If refrigerant is low, recharge system.

5. Reclaim excess refrigerant.

6. Refer to thermostat operating instructions.

7. Correct as follows: a) clean coil; b) verify drive is adjusted correctly; c) tighten fan on shaft.

8. See that air is flowing and that damper is set properly.

9. Reset high pressure cutout on inoperative circuit. Check contactor in inoperative circuit.

Problem

Unit short cycles

Possible cause

1. Remote thermostat

2. Loose connection in electrical unit

3. Thermostat contacts fluttering

4. Air flow to evaporator is restricted

5. Insufficient charge

Problem

Compressor starts and runs, but fan does not run.

Possible cause

1. Faulty switch

2. Open fan motor coil circuit

3. Fan binding on shroud or venturi ring

PKG-SVX14A-EN 31

Remedy

1. Repair or replace.

2. Trace and repair.

3. Repair or replace.

4. Flush or blow dirt out of coil.

5. Reclaim, evacuate, recharge per nameplate.

Remedy

1. Replace.

2. Replace.

3. Adjust fan mounting.

typical wiring diagramMaintenance

32 PKG-SVX14A-EN

typical wiring diagramMaintenance

PKG-SVX01A-EN 33

typical wiring diagramMaintenance

34 PKG-SVX14A-EN

typical wiring diagramMaintenance

PKG-SVX01A-EN 35

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For more information, contact your local Trane office or e-mail us at comfort@trane.com

Literature Order Number

Date

Supersedes

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

PKG-SVX14A-EN

October 2008

PKG-SVX14A-EN September 2007

Trane SCWH, SCRH User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

general information

Pre-Installation Considerations

dimensions & weightsInstallation

electrical requirementsInstallation

startup

Sequence of Operation

Maintenance

Periodic Checklists

Troubleshooting