Trane TWA090A-G, TWA120A-G, TWA180B-G, TWA240B-G Installation Manual

Installation, Operation, and Maintenance

Split System Air Conditioners Odyssey™™

R-22 Dry Charge Heat Pump Condenser — 7.5, 10, 15 and 20 Tons

((6600 HHzz)) TWA090A***G* TWA120A***G* TWA180B***G* TWA240B***G*

SSAAFFEETTYY WWAARRNNIINNGG

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

January 2014

SSP-SVX15C-EN

Introduction

WARNING

CAU

TION

NOTICE

Read this manual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices

Safety advisories appear throughout this manual as required. Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

The three types of advisories are defined as follows:

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

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

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

Important Environmental Concerns

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs.

Important Responsible Refrigerant Practices

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WWAARRNNIINNGG

PPrrooppeerr FFiieelldd WWiirriinngg aanndd GGrroouunnddiinngg RReeqquuiirreedd!!

FFaaiilluurree ttoo ffoollllooww ccooddee ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. AAllll ffiieelldd wwiirriinngg MMUUSSTT bbee ppeerrffoorrmmeedd bbyy qquuaalliiffiieedd ppeerrssoonnnneell.. IImmpprrooppeerrllyy iinnssttaalllleedd aanndd ggrroouunnddeedd ffiieelldd wwiirriinngg ppoosseess FFIIRREE aanndd EELLEECCTTRROOCCUUTTIIOONN hhaazzaarrddss.. TToo aavvooiidd tthheessee hhaazzaarrddss,, yyoouu MMUUSSTT ffoollllooww rreeqquuiirreemmeennttss ffoorr ffiieelldd wwiirriinngg iinnssttaallllaattiioonn aanndd ggrroouunnddiinngg aass ddeessccrriibbeedd iinn NNEECC aanndd yyoouurr llooccaall// ssttaattee eelleeccttrriiccaall ccooddeess..

WWAARRNNIINNGG

PPeerrssoonnaall PPrrootteeccttiivvee EEqquuiippmmeenntt ((PPPPEE)) RReeqquuiirreedd!!

FFaaiilluurree ttoo wweeaarr pprrooppeerr PPPPEE ffoorr tthhee jjoobb bbeeiinngg uunnddeerrttaakkeenn ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. TTeecchhnniicciiaannss,, iinn oorrddeerr ttoo pprrootteecctt tthheemmsseellvveess ffrroomm ppootteennttiiaall eelleeccttrriiccaall,, mmeecchhaanniiccaall,, aanndd cchheemmiiccaall hhaazzaarrddss,, MMUUSSTT ffoollllooww pprreeccaauuttiioonnss iinn tthhiiss mmaannuuaall aanndd oonn tthhee ttaaggss,, ssttiicckkeerrss,, aanndd llaabbeellss,, aass wweellll aass tthhee iinnssttrruuccttiioonnss bbeellooww::

•• BBeeffoorree iinnssttaalllliinngg//sseerrvviicciinngg tthhiiss uunniitt,, tteecchhnniicciiaannss MMUUSSTT ppuutt oonn aallll PPeerrssoonnaall PPrrootteeccttiivvee EEqquuiippmmeenntt ((PPPPEE)) rreeccoommmmeennddeedd ffoorr tthhee wwoorrkk bbeeiinngg uunnddeerrttaakkeenn.. AALLWWAAYYSS rreeffeerr ttoo aapppprroopprriiaattee MMSSDDSS sshheeeettss aanndd OOSSHHAA gguuiiddeelliinneess ffoorr pprrooppeerr PPPPEE..

•• WWhheenn wwoorrkkiinngg wwiitthh oorr aarroouunndd hhaazzaarrddoouuss cchheemmiiccaallss,, AALLWWAAYYSS rreeffeerr ttoo tthhee aapppprroopprriiaattee MMSSDDSS sshheeeettss aanndd OOSSHHAA gguuiiddeelliinneess ffoorr iinnffoorrmmaattiioonn oonn aalllloowwaabbllee ppeerrssoonnaall eexxppoossuurree lleevveellss,, pprrooppeerr rreessppiirraattoorryy pprrootteeccttiioonn aanndd hhaannddlliinngg rreeccoommmmeennddaattiioonnss..

•• IIff tthheerree iiss aa rriisskk ooff aarrcc oorr ffllaasshh,, tteecchhnniicciiaannss MMUUSSTT ppuutt oonn aallll PPeerrssoonnaall PPrrootteeccttiivvee EEqquuiippmmeenntt ((PPPPEE)) iinn aaccccoorrddaannccee wwiitthh NNFFPPAA 7700EE oorr ootthheerr ccoouunnttrryy--ssppeecciiffiicc rreeqquuiirreemmeennttss ffoorr aarrcc ffllaasshh pprrootteeccttiioonn,, PPRRIIOORR ttoo sseerrvviicciinngg tthhee uunniitt..

SSP-SVX15C-EN

IInnttrroodduuccttiioonn

WWAARRNNIINNGG

RReeffrriiggeerraanntt uunnddeerr HHiigghh PPrreessssuurree!!

FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd rreessuulltt iinn aann eexxpplloossiioonn wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy oorr eeqquuiippmmeenntt ddaammaaggee.. SSyysstteemm ccoonnttaaiinnss ooiill aanndd rreeffrriiggeerraanntt uunnddeerr hhiigghh pprreessssuurree.. RReeccoovveerr rreeffrriiggeerraanntt ttoo rreelliieevvee pprreessssuurree bbeeffoorree ooppeenniinngg tthhee ssyysstteemm.. SSeeee uunniitt nnaammeeppllaattee ffoorr rreeffrriiggeerraanntt ttyyppee.. DDoo nnoott uussee nnoonn--aapppprroovveedd rreeffrriiggeerraannttss,, rreeffrriiggeerraanntt ssuubbssttiittuutteess,, oorr rreeffrriiggeerraanntt aaddddiittiivveess..

Copyright

This document and the information in it are the property of Trane and may not be used or reproduced

in whole or in part, without the written permission of Trane. Trane reserves the right to revise this publication at any time and to make changes to its content without obligation to notify any person of such revision or change.

Trademarks

All trademarks referenced in this document are the trademarks of their respective owners.

Revision History

Removed warranty chapter, updated with running edits.

SSP-SVX15C-EN

3

Table of Contents

Model Number Description . . . . . . . . . . . . . . . . . 6

Heat Pump Condenser. . . . . . . . . . . . . . . . . . . . 6

General Information . . . . . . . . . . . . . . . . . . . . . . . . 7

Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Inspection Checklist . . . . . . . . . . . . . . . . . . . 8

Testing for Leaks. . . . . . . . . . . . . . . . . . . . . . . . . . 8

Lifting Recommendations . . . . . . . . . . . . . . . . . 8

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Unit Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Structural Preparation . . . . . . . . . . . . . . . . . 9

Rooftop Mounting . . . . . . . . . . . . . . . . . . . . 9

Ground Level Mounting . . . . . . . . . . . . . . . 9

Snow Belt Recommendations . . . . . . . . . . . . . 9

Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . 10

Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Heat Pump Condenser . . . . . . . . . . . . . . . . . . . 14

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Refrigerant Piping Guidelines. . . . . . . . . . . . . 15

Refrigerant Piping Procedures (Outdoor

Units). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Refrigerant Piping Procedures (Indoor

Unit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Leak Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

System Evacuation . . . . . . . . . . . . . . . . . . . 17

Insulating and Isolating Refrigerant

Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Refrigerant Charging Procedure . . . . . . . . . . 18

Liquid Charging . . . . . . . . . . . . . . . . . . . . . . . . . 19

Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 19

Unit Power Supply . . . . . . . . . . . . . . . . . . . 20

Low Voltage Wiring . . . . . . . . . . . . . . . . . . 20

ReliaTel™ Controls . . . . . . . . . . . . . . . . . . . 20

Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 21

Refrigerant Circuit. . . . . . . . . . . . . . . . . . . . 22

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Charging Charts and Superheat . . . . . . . . . . . 25

Installation Checklist. . . . . . . . . . . . . . . . . . . . . . . 26

Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . 26

Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 26

Pre-Start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Control Circuit Features . . . . . . . . . . . . . . . . . . 27

Discharge Temperature Limit

(DTL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Evaporator Defrost Control

(EDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Low Pressure Cut-Out (LPCO) . . . . . . . . . 27

High Pressure Cut-Out (HPCO) . . . . . . . . 27

Internal Overload Protector

(IOL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

ReliaTel™ Controls . . . . . . . . . . . . . . . . . . . . . . 28

Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 28

Functions and Features . . . . . . . . . . . . . . . 28

Service Test Modes for ReliaTel™

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Test Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Step Test Mode . . . . . . . . . . . . . . . . . . . . . . 33

Resistance Test Mode . . . . . . . . . . . . . . . . 33

Auto Test Mode . . . . . . . . . . . . . . . . . . . . . . 33

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Troubleshooting ReliaTel™ Controls. . . . . . . 34

System Status Checkout Procedure . . . . . . . 34

Method 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Method 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Resetting Cooling and Heating

Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Method 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Method 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Zone Temperature Sensor (ZTS) Service

Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Temperature Tests . . . . . . . . . . . . . . . . . . . . . . . 36

Test 1 - Zone Temperature

Thermistor (ZTEMP). . . . . . . . . . . . . . . . . . 36

Test 2 - Cooling Set Point (CSP) and

Heating Set Point (HSP). . . . . . . . . . . . . . . 36

Test 3 - System Mode and Fan

Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Test 4 - LED Indicator Test (SYS ON,

HEAT, & COOL). . . . . . . . . . . . . . . . . . . . . . . 37

Programmable & Digital Zone Sensor

Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Testing Serial Communication

Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

RLCI Loss of Communications. . . . . . . . . 37

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Monthly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Annually (Cooling Season) . . . . . . . . . . . . . . . 38

Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4

SSP-SVX15C-EN

TTaabbllee ooff CCoonntteennttss

Maintenance Log . . . . . . . . . . . . . . . . . . . . . . . . 39

Wiring Diagram Matrix . . . . . . . . . . . . . . . . . . . . 40

Charging Charts and Superheat . . . . . . . . . . . . . .

Dimensional Data. . . . . . . . . . . . . . . . . . . . . . . . . . .

Charging Charts and Superheat . . . . . . . . . . . . . .

SSP-SVX15C-EN

5

Model Number Description

Heat Pump Condenser

T W A 120 A 3 0 0

1 2 3 4 5 6 7 8 9 10 11 12

All 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. Its use will enable the owner/operator, installing contractors, and service engineers to define the operation, specific components, and other options for any specific 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 nameplate.

DDIIGGIITTSS 11 -- 33:: PPrroodduucctt TTyyppee

TWA = Split System Heat Pump

DDIIGGIITTSS 44 -- 66:: NNoommiinnaall GGrroossss CCoooolliinngg CCaappaacciittyy ((MMBBhh))

090 = 7.5 Tons (60Hz) 120 = 10 Tons (60Hz)

180 = 15 Tons (60Hz) 240 = 20 Tons (60Hz)

DDIIGGIITT 77:: MMaajjoorr DDeevveellooppmmeenntt SSeeqquueennccee

A = Single Compressor, Single Circuit, R-22 B = Dual Compressor, Dual Circuit, R-22

DDIIGGIITT 88:: EElleeccttrriiccaall CChhaarraacctteerriissttiiccss

3 = 208–230/60/3 4 = 460/60/3

DDIIGGIITTSS 99 -- 1100:: FFaaccttoorryy IInnssttaalllleedd OOppttiioonnss

00 = Packed Stock

DDIIGGIITTSS 1111:: MMiinnoorr DDeessiiggnn SSeeqquueennccee

* = Current Design Sequence

DDIIGGIITTSS 1122:: SSeerrvviiccee DDiiggiitt

* = Current Design Sequence

* *

1

1.

* = sequential alpha character

6

SSP-SVX15C-EN

General Information

This manual describes proper installation, operation, and maintenance procedures for air-cooled systems. By carefully reviewing the information within this manual and following 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. Should equipment failure occur, contact a qualified service organization with qualified, experienced HVAC technicians to properly diagnose and repair this equipment.

IImmppoorrttaanntt:: All phases of this installation must comply

with the NATIONAL, STATE & LOCAL CODES. In addition to local codes, the installation must conform with National Electric Code -ANSI/NFPA NO. 70 LATEST REVISION.

Any individual installing, maintaining, or servicing this equipment must be properly trained, licensed and qualified.

IImmppoorrttaanntt:: Do not remove the VFD without first

contacting technical support! For performance-related questions and diagnostic support in North America call 1877-872-6363. Any return requires a claim number FIRST. Removal of the VFD prior to this step will void the unit’s warranties.

Installation procedures should be performed in the sequence that they appear in this manual. Do not destroy or remove the manual from the unit. The

manual should remain weather-protected with the unit until all installation procedures are complete.

NNoottee:: It is not the intention of this manual to cover all

possible variations in systems that may occur or to provide comprehensive information concerning every possible contingency that may be encountered during an installation. If additional information is required or if specific problems arise that are not fully discussed in this manual, contact your local sales office.

Use the ”Installation Checklist,” p. 26 provided In this manual to verify that all necessary installation procedures have been completed. Do not use the checklist as a substitute for reading the information contained in the manual. Read the entire manual before beginning installation procedures.

Unit Description

These condensers come with single and dual compressor options. Single compressor outdoor units feature a single refrigeration circuitry, requiring only one set of refrigerant lines. Dual compressor/dual circuit models give true stand-by protection; if one compressor fails, the second will automatically startup. Also, the first compressor can be serviced without shutting down the unit since the refrigerant circuits are independent. During light load conditions, only one compressor will operate to save energy.

SSP-SVX15C-EN

7

Pre-Installation

Unit Inspection

Inspect material carefully for any shipping damage. If damaged, it must be reported to, and claims made against the transportation company. Compare the information that appears on the unit nameplate with ordering and submittal data to ensure the proper unit was shipped. Available power supply must be compatible with electrical characteristics specified on component nameplates. Replace damaged parts with authorized parts only.

Inspection Checklist

To protect against loss due to damage incurred in transit, complete the following checklist upon receipt of the unit.

Inspect individual pieces of the shipment before accepting the unit. Check for obvious damage to the unit or packing material.

Inspect the unit for concealed damage before it is stored and as soon as possible after delivery. Concealed damage must be reported within 15 days. If concealed damage is discovered, stop unpacking the shipment. 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 carrier’s terminal of damage immediately by phone and by mail. Request an immediate joint inspection of the damage by the carrier and the consignee.

Notify the sales representative and arrange for repair. Do not repair the unit until the damage is inspected by the carrier’s representative.

Testing for Leaks

All units are shipped with a holding charge of nitrogen in each circuit and should be leak tested before installation.

1. Remove the access panel.

2. Locate the liquid line or suction line access valve for each circuit.

3. Install gauges to determine if the circuits are still pressurized. If not, the charge has escaped and should be repaired as required to obtain a leak-free circuit.

Lifting Recommendations

WWAARRNNIINNGG

IImmpprrooppeerr UUnniitt LLiifftt!!

FFaaiilluurree ttoo pprrooppeerrllyy lliifftt uunniitt ccoouulldd rreessuulltt iinn uunniitt ddrrooppppiinngg aanndd ppoossssiibbllyy ccrruusshhiinngg ooppeerraattoorr// tteecchhnniicciiaann wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy,, aanndd eeqquuiippmmeenntt oorr pprrooppeerrttyy--oonnllyy ddaammaaggee.. TTeesstt lliifftt uunniitt aapppprrooxxiimmaatteellyy 2244 iinncchheess ttoo vveerriiffyy pprrooppeerr cceenntteerr ooff ggrraavviittyy lliifftt ppooiinntt.. TToo aavvooiidd ddrrooppppiinngg ooff uunniitt,, rreeppoossiittiioonn lliiffttiinngg ppooiinntt iiff uunniitt iiss nnoott lleevveell..

NNOOTTIICCEE

EEqquuiippmmeenntt DDaammaaggee!!

UUssee sspprreeaaddeerr bbaarrss ttoo pprreevveenntt ssttrraappss ffrroomm ddaammaaggiinngg tthhee uunniitt.. IInnssttaallll tthhee bbaarrss bbeettwweeeenn lliiffttiinngg ssttrraappss,, bbootthh uunnddeerrnneeaatthh tthhee uunniitt aanndd aabboovvee tthhee uunniitt ttoo pprreevveenntt tthhee ssttrraappss ffrroomm ccrruusshhiinngg tthhee uunniitt ccaabbiinneett oorr ddaammaaggiinngg tthhee ffiinniisshh..

Before preparing the unit for lifting, estimate the approximate center of gravity for lifting safety. Because of placement of internal components, the unit weight may be unevenly distributed. See ”Weights”, p. 14 for approximate unit weights.

The crated unit can be moved using a forklift of suitable capacity. For lifting the unit, attach lifting straps or slings securely to the lifting holes at each corner (see unit drawings in ”Weights”, p. 14). Use spreader bars to protect the unit casing from damage. Test lift the unit to determine proper balance and stability.

Clearances

Provide enough space around the unit to allow unrestricted access to all service points. Refer to the

”Dimensional Data,” p. 10 for unit dimensions and

minimum required service and free air clearances. Observe the following points to ensure proper unit operation.

1. Do not install the unit under a low overhang. Condenser discharge must not be restricted—refer to notes in ”Dimensional Data drawings,” p. 10.

IImmppoorrttaanntt:: Do not obstruct condenser discharge

air. This can result in warm air recirculation through the coil.

2. Do not locate the unit in a position where runoff water can fall into the fan discharge openings.

3. Condenser intake air is supplied from three or four sides of the unit. Adhere to the minimum required clearances given in unit dimensional drawings (see

”Dimensional Data,” p. 10).

8

SSP-SVX15C-EN

Outd oor Unit

Gas (Suction ) Line - Insulated

Liquid Line Insulated

Unit Mounting Chan nels

Elevation (Mounting Fram e )

Roo f Trus sing

Ceiling

Roof Cons truction

6” Rad iu s

PPrree--IInnssttaallllaattiioonn

Unit Mounting

WWAARRNNIINNGG

MMoouunnttiinngg IInntteeggrriittyy!!

FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonn bbeellooww ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy oorr ppoossssiibbllee eeqquuiippmmeenntt oorr pprrooppeerrttyy--oonnllyy ddaammaaggee.. EEnnssuurree tthhee rrooooff ssttrruuccttuurree ssuuppppoorrttss aarree ssttrroonngg eennoouugghh ttoo ssuuppppoorrtt tthhee wweeiigghhtt ooff tthhee uunniitt aanndd aannyy aacccceessssoorriieess..

Structural Preparation

NNOOTTIICCEE

RRooooff DDaammaaggee!!

SSyysstteemm ccoonnttaaiinnss ooiill aanndd rreeffrriiggeerraanntt uunnddeerr hhiigghh pprreessssuurree.. RRooooffss sshhoouulldd bbee pprrootteecctteedd ffrroomm eexxppoossuurree ttoo ooiillss aanndd rreeffrriiggeerraanntt iinn tthhee ssyysstteemm.. IIff rrooooffttoopp iiss nnoott pprrootteecctteedd,, ddaammaaggee ttoo tthhee rrooooff mmaayy ooccccuurr..

IImmppoorrttaanntt:: Refer to local building codes for proper

installation. All installation must comply with local building codes.

Rooftop Mounting

If the unit will be roof mounted, determine for certain that the structure is strong enough to support the unit and any required accessories, see ”Weights”, p. 14. The unit should be elevated on a level, field fabricated fourinch steel or wood 4" x 4" mounting frame. Complete the frame and secure it into position before lifting the unit to the roof. The mounting frame must support a minimum of three of the unit’s four sides and should span roof supports to distribute the load on the roof.

Figure 1. Roof mounted unit

Ground Level Mounting

For ground level installation, the unit base should be adequately supported and hold the unit near level. The installation must meet the guidelines set forth in local codes. The support should extend two inches beyond the unit base channels at all points. The unit and support must be isolated from any adjacent structure to prevent possible noise or vibration problems. Any ground level location must comply with required clearances given in the unit dimensional drawings (see

”Dimensional Data,” p. 10).

Snow Belt Recommendations

In regions where deep snow is encountered, raise the unit a minimum distance of 8 to 12 inches above the mounting surface. This will reduce the risk of snow blocking the coil and improves runoff of water produced during the defrost cycle. Avoid locating the unit where snow tends to drift. Snow accumulations must be removed from around the unit immediately to prevent drastic efficiency reduction. A snow drift barrier may be constructed around the unit to prevent snow blockage. Clearance between the snow barrier and the unit must comply with the clearances given in

”Dimensional Data drawings,” p. 10.

SSP-SVX15C-EN

9

Dimensional Data

H

W

D

H

W

D

Figure 2. Height, width and depth measurements

H - in. (mm) W - in. (mm) D - in. (mm)

TWA090A

TWA120A

TWA180B, TWA240B 45.125 (1146.1) 52.125 (1324) 40 (1016)

39.125 (993.8) 42.125 (1070) 36 (914.4)

39.125 (993.8) 52.125 (1324) 40 (1016)

10

SSP-SVX15C-EN

BOTTOM OF UNIT

14 3/8"

(365.1)

26 15/16"

(684.2)

39 3/16"

(995.4)

3 1/16" (77.8)

2" (50.8)

33 13/1 6"

(858.8)

1/16"

(1.6)

6"

(152.4)

21 11 /16"

(550.9)

34 3/4"

(882.7)

40 3/4"

(1035)

3" (76.2)

1 13/16"

(46)

27 11/ 16"

(703.3 )

2 5/16"

(58.7)

4 3/16"

(106.4)

33 15 /16"

(862)

36 3/8"

(923.9)

29 13/16"

(757.2)

8 5/16"

(211.1)

5 5/8"

(143)

35 15 /16"

(912.8 )

41 1/16"

(1043)

42 1/8"

(1070)

NOTES:

1. ACCESS OPENING IS FOR FIELD INSTALLED BAYLOAM ACCESS ORY.

2. MINIMUM CLEARANCE FOR PROPER OPERATION IS 36" ( 914.4) FROM WALLS, S HRUBBERY, P RIVACY FENCES ETC. MINIMUM CLEARANCE BETWEEN ADJACENT UNITS IS 72" (1828.8). RECOMMENDED S ERVICE CLEARANCE 48" (1219.2)

3. TOP DISCHARGE AREA SHOULD BE UNRESTRICTED FOR 100" (2540) MINIMUM. UNIT SHOULD BE PLACED SO ROOF RUN-OFF WATER DOES NOT POUR DIRECTLY ON UNIT

4. OUTDOOR AIR TEMPERATURE SENSOR OPENING (DO NOT BLOCK OPENING)

SERVICE CLEARANCE 48" (1219.2) (S EE NOTE 2 FOR CLEARANCE)

SEE NOTE 1

REFRIGERANT ACCES S

HAIL GUARD (OPTIONAL)

SUCTION LINE

LIQUID LINE

CONTROL WIRING

LINE VOLTAGE

SER VICE P ANEL

HAIL GUARD (OPTIONAL)

SERVICE PANEL

SEE NOTE 3

SERVICE P ANEL SIDE

SEE NOTE 4

WITH HAIL GUARD

7/16" (11.1) DIA. ISOLATOR MOUNTING HOLES (OUTS IDE HOLES - 4 P LACES)

WITH HAIL GUARD

6"

(152.4)

Figure 3. 7.5 ton heat pump, single compressor

DDiimmeennssiioonnaall DDaattaa

SSP-SVX15C-EN

11

BOTTOM OF UNIT

51 15/16"

(1319.2)

50 15/16"

(1293.8)

1/16" (1.6)

2 7/8" (73)

32 7/8"

(835)

44 3/4"

(1136.6)

25 11 /16"

(652.5)

6" (152. 4)

1 13/16" (46)

14 5/16"

(363.5)

37 11 /16"

(957.3)

44 3/4"

(1136.6)

50 3/4"

(1289)

3" (76.2)

31 11 /16"

(805)

3 13/16 "

(96.8)

2 3/16"

(55.6)

1 11/16"

(42.9)

37 15 /16"

(963.6)

42 5/16"

(1074.7)

35 3/4"

(908)

1 1/4" (31.7)

8 1/4"

(209.5)

5 9/16"

(141.3)

4 3/8" (111.1)

4" (101. 6)

4 1/4" (108)

39 15/16"

(1014.4)

7/16" (11.1) DIA. ISOLATOR MOUNTING HOLES (OUTS IDE HOLES - 4 PLACES)

NOTES :

1. ACCESS OPENING IS FOR FIELD INSTALLED BAYLOAM ACCESSORY.

2. MINIMUM CLEARANCE FOR PROPER OPERATION IS 36" (914.4) FROM WALLS, S HRUBBERY, PRIVACY FENCES ETC. MINIMUM CLEARANCE BETWEEN ADJACENT UNITS IS 72" (1828.8). RECOMMENDED SERVICE CLEARANCE 48" (1219.2)

3. TOP DISCHARGE AREA SHOULD BE UNRESTRICTED FOR 100" (2540) MINIMUM. UNIT SHOULD BE PLACED SO ROOF RUN-OFF WATER DOES NOT POUR DIRECTLY ON UNIT

4. OUTDOOR AIR TEMPERATURE SENSOR OPENING (DO NOT BLOCK OPENING)

LIQUID LINE

SUCTION LINE

SERVICE P ANEL SIDE

SERVICE CLEARANCE 48" (1219.2) (S EE NOTE 2 FOR CLEARANCE

HAIL GUARD (OPTIONAL)

SERVICE PANEL

SEE NOTE 3

HAIL GUARD (OPTIONAL)

SERVICE P ANEL

CONTROL WIRING

LINE VOLTAGE

REFRIGERANT ACCES S

SEE NOTE 1

SEE NOTE 4

WITH HAIL GUARD

6" (152. 4)

DDiimmeennssiioonnaall DDaattaa

Figure 4. 10 ton heat pump, single compressor

12

SSP-SVX15C-EN

Figure 5. 15, 20 ton heat pump, dual compressor

BOTTOM OF UNIT

1/16"

(1.6)

9"

(228.6)

9"

(228.6)

25 11/16"

(652.5)

46"

(1168. 4)

93"

(2362.2)

87"

(2210)

41 1/ 2"

(1054 .1)

2 3/16"

(55.6)

3" (76.2)

6 13/16"

(173)

36 7/8"

(936.6)

6 5/16" (160.3)

3 11/16" (94)

15/16" (23.8)

1 3/16" (30.2)

39 7/8"

(1012.8)

41 5/8"

(1057.3)

9 1/4" (235)

41 3/8"

(1051)

93 5/16"

(2370.1)

45 1/8"

(1146.2)

14 1/2"

(368.3)

14 5/8"

(371.5)

12 5/8"

(320.7)

5 5/8"

(143)

4 1/4"

(108)

6 13/16" (173)

95 7/16"

(2424.112)

44 3/16"

(1122.4)

LINE VOLTAGE

SUCTION LINES

REFRIGERANT ACCES S

LIQUID LINES

NOTES:

1. MINIMUM CLEARANCE FOR PROPER OPERATION IS 36" (914.4) FROM WALLS, S HRUBBERY, P RIVACY FENCES ETC. MINIMUM CLEARANCE BETWEEN ADJACENT UNITS IS 72" (1829). RECOMMENDED SERVICE CLEARANCE 48" (1219.2)

2. TOP DISCHARGE AREA SHOULD BE UNRESTRICTED FOR 100" (2540) MINIMUM. UNIT SHOULD BE PLACED SO ROOF RUN-OFF WATER DOES NOT POUR DIRECTLY ON UNIT

3. OUTDOOR AIR TEMPERATURE SENSOR OPENING (DO NOT BLOCK OPENING).

7/16" (11.1) ( DIA. ISOLATOR MOUNTING HOLES (OUTS IDE HOLES - 4 P LACES)

SERVICE PANEL SIDE

SERVICE CLEARANCE 48" (1219.2) (SEE NOTE 1 FOR CLEARANCE)

HAIL GUARD (OPTIONAL)

SER VICE PANEL

DIMENSIONAL DETAIL

FRONT DETAIL A

SEE NOTE 2

HAIL GUARD (OPTIONAL)

DETAIL A

SERVICE PANEL

CONTROL WIRING

WITH HAIL GUARD

SEE NOTE 3

WITH HAIL GUARD

DDiimmeennssiioonnaall DDaattaa

SSP-SVX15C-EN

13

Weights

#1

#2

#3

#4

LIFTING HOLES (BOTH SIDES)

SE

RVICE

ACCESS

SERVICE

ACCES S

SERVICE

ACCES S

#1

#2

#3

#4

LIFTING HOLES

(BOTH S IDES)

Heat Pump Condenser

Table 1. TWA unit and corner weights — lbs (60 Hz)

Tons Model No.

7.5 TWA090A 394 340 117 86 58 79

10 TWA120A 509 438 127 121 72 118

15 TWA180B 898 765 202 192 181 190

20 TWA240B 981 848 254 266 147 181

Shipping

Max (lbs)

Net Max

(lbs)

1 2 3 4

Corner Weights

Figure 6. TWA090, 120

Figure 7. TWA180, 240

14

SSP-SVX15C-EN

Installation

Contact manufacturer for review

Accep table liquid-riser height

based on total liquid -line length (TTA below indoor unit)

Contact manufacturer for review

Refrigerant Piping Guidelines

Figure 8. Allowable elevation difference: Cooling only TTA above indoor unit

Figure 9. Allowable elevation difference: TTA below indoor unit

NNoottee:: Route refrigerant piping for minimum linear length, minimum number of bends and fittings (no reducers) and

minimum amount of line exposed to outdoor ambients.

SSP-SVX15C-EN

15

IInnssttaallllaattiioonn

Refrigerant Piping Procedures (Outdoor Units)

WWAARRNNIINNGG

RR--441100AA RReeffrriiggeerraanntt uunnddeerr HHiigghheerr PPrreessssuurree tthhaann RR--2222!!

FFaaiilluurree ttoo uussee pprrooppeerr eeqquuiippmmeenntt oorr ccoommppoonneennttss aass ddeessccrriibbeedd bbeellooww,, ccoouulldd rreessuulltt iinn eeqquuiippmmeenntt ffaaiilliinngg aanndd ppoossssiibbllyy eexxppllooddiinngg,, wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh,, sseerriioouuss iinnjjuurryy,, oorr eeqquuiippmmeenntt ddaammaaggee.. TThhee uunniittss ddeessccrriibbeedd iinn tthhiiss mmaannuuaall uussee RR--441100AA rreeffrriiggeerraanntt wwhhiicchh ooppeerraatteess aatt hhiigghheerr pprreessssuurreess tthhaann RR--2222.. UUssee OONNLLYY RR--441100AA rraatteedd sseerrvviiccee eeqquuiippmmeenntt oorr ccoommppoonneennttss wwiitthh tthheessee uunniittss.. FFoorr ssppeecciiffiicc hhaannddlliinngg ccoonncceerrnnss wwiitthh RR--441100AA,, pplleeaassee ccoonnttaacctt yyoouurr llooccaall TTrraannee rreepprreesseennttaattiivvee..

Each TTA unit ships with a holding charge of dry nitrogen. The nitrogen should be removed and the entire system evacuated (at the proper time) to avoid possible contamination.

1. Remove the compressor service access panel.

2. Locate the liquid and suction line service valves. Check that the piping connection stubs on the valves (Figure 10, p. 16) line up properly with the holes in the unit cabinet.

Figure 10. Outdoor units - refrigerant piping (with dry nitrogen)

NNOOTTIICCEE

SSyysstteemm CCoommppoonneenntt DDaammaaggee!!

DDoo nnoott rreemmoovvee tthhee sseeaall ccaappss ffrroomm rreeffrriiggeerraanntt ccoonnnneeccttiioonnss,, oorr ooppeenn tthhee sseerrvviiccee vvaallvveess uunnttiill pprreeppaarreedd ttoo bbrraazzee rreeffrriiggeerraanntt lliinneess ttoo tthhee ccoonnnneeccttiioonnss.. EExxcceessssiivvee eexxppoossuurree ttoo aattmmoosspphheerree ((>> 55 mmiinn..)) mmaayy aallllooww mmooiissttuurree oorr ddiirrtt ttoo ccoonnttaammiinnaattee tthhee ssyysstteemm,, ddaammaaggiinngg vvaallvvee sseeaallss aanndd ccaauussiinngg iiccee ffoorrmmaattiioonn iinn ssyysstteemm ccoommppoonneennttss..

WWAARRNNIINNGG

HHaazzaarrdd ooff EExxpplloossiioonn aanndd DDeeaaddllyy GGaasseess!!

FFaaiilluurree ttoo ffoollllooww aallll pprrooppeerr ssaaffee rreeffrriiggeerraanntt hhaannddlliinngg pprraaccttiicceess ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. NNeevveerr ssoollddeerr,, bbrraazzee oorr wweelldd oonn rreeffrriiggeerraanntt lliinneess oorr aannyy uunniitt ccoommppoonneennttss tthhaatt aarree aabboovvee aattmmoosspphheerriicc pprreessssuurree oorr wwhheerree rreeffrriiggeerraanntt mmaayy bbee pprreesseenntt.. AAllwwaayyss rreemmoovvee rreeffrriiggeerraanntt bbyy ffoolllloowwiinngg tthhee gguuiiddeelliinneess eessttaabblliisshheedd bbyy tthhee EEPPAA FFeeddeerraall CClleeaann AAiirr AAcctt oorr ootthheerr ssttaattee oorr llooccaall ccooddeess aass aapppprroopprriiaattee.. AAfftteerr rreeffrriiggeerraanntt rreemmoovvaall,, uussee ddrryy nniittrrooggeenn ttoo bbrriinngg ssyysstteemm bbaacckk ttoo aattmmoosspphheerriicc pprreessssuurree bbeeffoorree ooppeenniinngg ssyysstteemm ffoorr rreeppaaiirrss.. MMiixxttuurreess ooff rreeffrriiggeerraannttss aanndd aaiirr uunnddeerr pprreessssuurree mmaayy bbeeccoommee ccoommbbuussttiibbllee iinn tthhee pprreesseennccee ooff aann iiggnniittiioonn ssoouurrccee lleeaaddiinngg ttoo aann eexxpplloossiioonn.. EExxcceessssiivvee hheeaatt ffrroomm ssoollddeerriinngg,, bbrraazziinngg oorr wweellddiinngg wwiitthh rreeffrriiggeerraanntt vvaappoorrss pprreesseenntt ccaann ffoorrmm hhiigghhllyy ttooxxiicc ggaasseess aanndd eexxttrreemmeellyy ccoorrrroossiivvee aacciiddss..

3. Remove the refrigerant connection seal caps and open the service valve slowly to release the nitrogen from the unit.

4. Cut, fit and braze tubing, starting at the outdoor unit and work toward the indoor unit. See recommended tube sizes, Table 3, p. 18.

NNoottee:: Use long radius ells for all 90° bends.

All brazing should be done using a 2 to 3 psig dry nitrogen purge flowing through the pipe being brazed, see Figure 10, p. 16.

NNOOTTIICCEE

SSyysstteemm CCoommppoonneenntt DDaammaaggee!!

IInnssttaallll aa rreegguullaattiinngg vvaallvvee bbeettwweeeenn tthhee nniittrrooggeenn ssoouurrccee aanndd tthhee ggaauuggee mmaanniiffoolldd.. UUnnrreegguullaatteedd pprreessssuurree ccaann ddaammaaggee ssyysstteemm ccoommppoonneennttss..

NNOOTTIICCEE

SSyysstteemm CCoommppoonneenntt DDaammaaggee!!

WWeett--wwrraapp aallll vvaallvveess aanndd pprrootteecctt ppaaiinntteedd ssuurrffaacceess ffrroomm eexxcceessssiivvee hheeaatt.. HHeeaatt ccaann ddaammaaggee ssyysstteemm ccoommppoonneennttss aanndd tthhee uunniitt ffiinniisshh..

5. Shut off nitrogen supply. Shut off the manifold valve for the line that is connected to the suction line service valve. Disconnect the line from the gauge port on the valve.

16

SSP-SVX15C-EN

IInnssttaallllaattiioonn

Refrigerant Piping Procedures (Indoor Unit)

Once liquid and suction lines are complete to the refrigerant connections on the indoor unit, remove the gauge port core(s) on the indoor unit connection stubs to release the dry nitrogen charge.

NNOOTTIICCEE

UUnniitt DDaammaaggee!!

DDoo nnoott aappppllyy hheeaatt ttoo rreemmoovvee sseeaall ccaappss uunnttiill tthhee ggaauuggee ppoorrtt ccoorreess hhaavvee bbeeeenn rreemmoovveedd.. IIff sseeaall ccaappss aarree iinnttaacctt,, aapppplliiccaattiioonn ooff hheeaatt mmaayy ggeenneerraattee eexxcceessssiivvee pprreessssuurree iinn tthhee uunniitt aanndd rreessuulltt iinn ddaammaaggee ttoo tthhee ccooiill oorr eexxppaannssiioonn vvaallvvee..

1. Remove both seal caps from the indoor unit connection stubs.

NNOOTTIICCEE

UUnniitt DDaammaaggee!!

DDoo nnoott rreemmoovvee tthhee sseeaall ccaappss ffrroomm rreeffrriiggeerraanntt ccoonnnneeccttiioonnss,, oorr ooppeenn tthhee sseerrvviiccee vvaallvveess uunnttiill pprreeppaarreedd ttoo bbrraazzee rreeffrriiggeerraanntt lliinneess ttoo tthhee ccoonnnneeccttiioonnss..

2. Turn on nitrogen supply. Nitrogen enters through the liquid line gauge port.

3. Braze the liquid line connections.

4. Open the gauge port on the suction line and then braze the suction line to the connection stub. Nitrogen will bleed out the open gauge port on the suction line.

5. Shut off nitrogen supply.

Leak Check

WWAARRNNIINNGG

HHaazzaarrdd ooff EExxpplloossiioonn!!

FFaaiilluurree ttoo ffoollllooww rreeccoommmmeennddeedd ssaaffee lleeaakk tteesstt pprroocceedduurreess ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy oorr eeqquuiippmmeenntt oorr pprrooppeerrttyy--oonnllyy--ddaammaaggee.. NNeevveerr uussee aann ooppeenn ffllaammee ttoo ddeetteecctt ggaass lleeaakkss.. UUssee aa lleeaakk tteesstt ssoolluuttiioonn ffoorr lleeaakk tteessttiinngg..

After the brazing operation of refrigerant lines to both the outdoor and indoor unit is completed, the field brazed connections must be checked for leaks. Pressurize the system through the service valve with dry nitrogen to 200 psi. Use soap bubbles or other leakchecking methods to ensure that all field joints are leak free. If not, release pressure, repair and repeat leak test.

System Evacuation

1. After completion of leak check, evacuate the system.

2. Attach appropriate hoses from manifold gauge to gas and liquid line pressure taps.

NNoottee:: Unnecessary switching of hoses can be

avoided and complete evacuation of all lines leading to sealed system can be accomplished with manifold center hose and connecting branch hose to a cylinder of R–22 and vacuum pump.

3. Attach center hose of manifold gauges to vacuum pump.

NNOOTTIICCEE

OOppeerraattiinngg UUnnddeerr VVaaccuuuumm!!

DDoo nnoott ooppeerraattee oorr aappppllyy ppoowweerr ttoo tthhee ccoommpprreessssoorr wwhhiillee uunnddeerr aa vvaaccuuuumm.. FFaaiilluurree ttoo ffoollllooww tthheessee iinnssttrruuccttiioonnss wwiillll rreessuulltt iinn ccoommpprreessssoorr ffaaiilluurree..

WWAARRNNIINNGG

HHaazzaarrdd ooff EExxpplloossiioonn!!

FFaaiilluurree ttoo ffoollllooww tthheessee rreeccoommmmeennddaattiioonnss ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy oorr eeqquuiippmmeenntt oorr pprrooppeerrttyy--oonnllyy ddaammaaggee.. UUssee oonnllyy ddrryy nniittrrooggeenn wwiitthh aa pprreessssuurree rreegguullaattoorr ffoorr pprreessssuurriizziinngg uunniitt.. DDoo nnoott uussee aacceettyylleennee,, ooxxyyggeenn oorr ccoommpprreesssseedd aaiirr oorr mmiixxttuurreess ccoonnttaaiinniinngg tthheemm ffoorr pprreessssuurree tteessttiinngg.. DDoo nnoott uussee mmiixxttuurreess ooff aa hhyyddrrooggeenn ccoonnttaaiinniinngg rreeffrriiggeerraanntt aanndd aaiirr aabboovvee aattmmoosspphheerriicc pprreessssuurree ffoorr pprreessssuurree tteessttiinngg aass tthheeyy mmaayy bbeeccoommee ffllaammmmaabbllee aanndd ccoouulldd rreessuulltt iinn aann eexxpplloossiioonn.. RReeffrriiggeerraanntt,, wwhheenn uusseedd aass aa ttrraaccee ggaass sshhoouulldd oonnllyy bbee mmiixxeedd wwiitthh ddrryy nniittrrooggeenn ffoorr pprreessssuurriizziinngg uunniittss..

SSP-SVX15C-EN

4. Evacuate the system to hold a 500 micron vacuum.

5. Close off valve to vacuum pump and observe the micron gauge. If gauge pressure rises above 500 microns in one minute, then evacuation is incomplete or the system has a leak.

6. If vacuum gauge does not rise above 500 microns in 10 minutes, the evacuation should be complete.

NNOOTTIICCEE

EEqquuiippmmeenntt DDaammaaggee!!

CChhaarrggee wwiitthh aacccceessss ppoorrtt oonn tthhee lliiqquuiidd lliinnee sseerrvviiccee vvaallvvee oonnllyy..

7. With vacuum pump and micron gauge blanked off, open valve on R–22 cylinder and allow refrigerant pressure to build up to about 80 psig.

8. Close valve on the R–22 supply cylinder. Close valves on manifold gauge set and remove refrigerant charging hoses from liquid and gas

17

IInnssttaallllaattiioonn

gauge ports.

9. Leak test the entire system. Using proper procedures and caution, as described in the previous section, repair any leaks found and repeat the leak test.

Insulating and Isolating Refrigerant Lines

Insulate the entire suction line with refrigerant piping insulation. Also insulate any portion of the liquid line exposed to temperature extremes. Insulate and isolate liquid and suction lines from each other. Isolate refrigerant lines from the structure and any duct work.

IImmppoorrttaanntt::

1. To prevent possible noise or vibration problems, be certain to isolate refrigerant lines from the building.

2. All suction and hot gas bypass piping (if installed) should be insulated from the termination in the air handler to the condensing unit cabinet entry. Failure to do so can cause condensate drip off and performance degradation.

3. Prior to starting a unit, it is advisable to have the approved oils available in the event oil needs to be added to the system.

NNOOTTIICCEE

EEqquuiippmmeenntt DDaammaaggee!!

TThhiiss iiss PPOOEE ooiill,, wwhhiicchh rreeaaddiillyy aabbssoorrbbss mmooiissttuurree.. AAllwwaayyss uussee nneeww ooiill aanndd nneevveerr lleeaavvee ccoonnttaaiinneerrss ooppeenn ttoo aattmmoosspphheerree wwhhiillee nnoott iinn uussee..

Refrigerant Charging Procedure

If charging by weight, refer to Table 3, p. 18 for starting change. If refrigerant adjustments are needed because of length of line, refer to ”Charging Charts and

Superheat,” p. 25.

Charge by weight through the gauge port on the liquid line. Once the charge enters the system, backseat (open) the liquid line service valve and disconnect the charging line and replace the cap on the gauge port.

NNootteess::

• R-22 should only be charged in the liquid state.

• When possible, always charge the refrigerant into the liquid line of the unit.

• If the entire charge can’t be charged into the liquid line, the balance of the unit charge can be metered through a charging manifold set as liquid — preferably through a schrader valve into the suction line to the compressor — only while the compressor is running.

• Check and adjust superheat using Table 6, p.

25, then re-check charging charts to

determine if charge corrections are necessary.

NNOOTTIICCEE

EEqquuiippmmeenntt DDaammaaggee!!

NNeevveerr cchhaarrggee lliiqquuiidd rreeffrriiggeerraanntt iinnttoo tthhee ssuuccttiioonn lliinnee ooff tthhee uunniitt wwiitthh tthhee ccoommpprreessssoorr ooffff..

Figure 11. Outdoor units - refrigerant piping

Table 2. R-22 TWA approved oils

Unit Model Number

TWA090A, TWA120A,

TWA180B, TWA240B

For units equipped with compressors containing site glasses, the oil level must be visible through the sight glass when the compressor is running under stabilized conditions and a few minutes after the compressor has stopped.

18

Approved Oils

Trane Oil Part Number OIL00027

(1 quart container)

SSP-SVX15C-EN

Table 3. Estimated charge levels at ARI rated line lengths (25 feet)

IInnssttaallllaattiioonn

Refrigerant Charge

Matched Set

TWA090A w/TWE090A

TWA120A w/TWE120A

TWA180B w/ TWE180B

TWA240B w/ TWE240B

Circuit 1 Circuit 2

20.6 NA

27.9 NA

22.9 24.2

23.5 23.5

Liquid Charging

This procedure is accomplished with the unit operating. Electrical connections must be complete. Do not proceed until the system is ready to operate.

NNoottee:: The compressor access panel must be installed

when the unit is running and being charged. Manifold hoses must be routed through refrigerant gauge access hole(s). See

”Dimensional Data,” p. 10 for specific locations.

WWAARRNNIINNGG

LLiivvee EElleeccttrriiccaall CCoommppoonneennttss!!

FFaaiilluurree ttoo ffoollllooww aallll eelleeccttrriiccaall ssaaffeettyy pprreeccaauuttiioonnss wwhheenn eexxppoosseedd ttoo lliivvee eelleeccttrriiccaall ccoommppoonneennttss ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. WWhheenn iitt iiss nneecceessssaarryy ttoo wwoorrkk wwiitthh lliivvee eelleeccttrriiccaall ccoommppoonneennttss,, hhaavvee aa qquuaalliiffiieedd lliicceennsseedd eelleeccttrriicciiaann oorr ootthheerr iinnddiivviidduuaall wwhhoo hhaass bbeeeenn pprrooppeerrllyy ttrraaiinneedd iinn hhaannddlliinngg lliivvee eelleeccttrriiccaall ccoommppoonneennttss ppeerrffoorrmm tthheessee ttaasskkss..

1. Turn on power to the unit. Allow the system to run for 15 minutes to stabilize operating conditions.

2. Measure airflow across the indoor coil. Compare the measurements with the fan performance data in the Data/Submittal or Service Facts. Once proper airflow is established, compare discharge pressure and liquid temperature to the ”Charging Charts,” p.

25. Add or remove refrigerant (liquid only) as

required to obtain correct discharge pressure and liquid temperature.

3. Check suction line superheat and condenser subcooling to ensure the unit is operating properly.

4. Disconnect all power to the unit.

IImmppoorrttaanntt:: If the unit is charged and left without

power until a later date, the crankcase heater should be energized for a minimum of 8 hours prior to powering the compressor(s).

Per Circuit

Liquid Line

Diameter

0.625 (5/8”) 1.375 (1 3/8”)

0.5 (1/2”) 1.375 (1 3/8”)

0.5 (1/2") 1.375 (1 3/8")

0.625 (5/8") 1.375 (1 3/8")

Vapor Line

Diameter

WWAARRNNIINNGG

HHaazzaarrddoouuss VVoollttaaggee ww//CCaappaacciittoorrss!!

FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr aanndd ddiisscchhaarrggee ccaappaacciittoorrss bbeeffoorree sseerrvviicciinngg ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee ddiissccoonnnneeccttss aanndd ddiisscchhaarrggee aallll mmoottoorr ssttaarrtt//rruunn ccaappaacciittoorrss bbeeffoorree sseerrvviicciinngg.. FFoollllooww pprrooppeerr lloocckkoouutt// ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr ccaannnnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd.. FFoorr vvaarriiaabbllee ffrreeqquueennccyy ddrriivveess oorr ootthheerr eenneerrggyy ssttoorriinngg ccoommppoonneennttss pprroovviiddeedd bbyy TTrraannee oorr ootthheerrss,, rreeffeerr ttoo tthhee aapppprroopprriiaattee mmaannuuffaaccttuurreerr’’ss lliitteerraattuurree ffoorr aalllloowwaabbllee wwaaiittiinngg ppeerriiooddss ffoorr ddiisscchhaarrggee ooff ccaappaacciittoorrss.. VVeerriiffyy wwiitthh aann aapppprroopprriiaattee vvoollttmmeetteerr tthhaatt aallll ccaappaacciittoorrss hhaavvee ddiisscchhaarrggeedd..

FFoorr aaddddiittiioonnaall iinnffoorrmmaattiioonn rreeggaarrddiinngg tthhee ssaaffee ddiisscchhaarrggee ooff ccaappaacciittoorrss,, sseeee PPRROODD--SSVVBB0066AA--EENN..

5. Remove the charging system from the unit.

6. Replace all panels.

Electrical Wiring

WWAARRNNIINNGG

PPrrooppeerr FFiieelldd WWiirriinngg aanndd GGrroouunnddiinngg RReeqquuiirreedd!!

FFaaiilluurree ttoo ffoollllooww ccooddee ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. AAllll ffiieelldd wwiirriinngg MMUUSSTT bbee ppeerrffoorrmmeedd bbyy qquuaalliiffiieedd ppeerrssoonnnneell.. IImmpprrooppeerrllyy iinnssttaalllleedd aanndd ggrroouunnddeedd ffiieelldd wwiirriinngg ppoosseess FFIIRREE aanndd EELLEECCTTRROOCCUUTTIIOONN hhaazzaarrddss.. TToo aavvooiidd tthheessee hhaazzaarrddss,, yyoouu MMUUSSTT ffoollllooww rreeqquuiirreemmeennttss ffoorr ffiieelldd wwiirriinngg iinnssttaallllaattiioonn aanndd ggrroouunnddiinngg aass ddeessccrriibbeedd iinn NNEECC aanndd yyoouurr llooccaall// ssttaattee eelleeccttrriiccaall ccooddeess..

Field wiring consists of providing power supply to the unit, installing the system indoor thermostat and providing low voltage system interconnecting wiring. Access to electrical connection locations is shown in

”Dimensional Data,” p. 10. Determine proper wire sizes

and unit protective fusing requirements by referring to the unit nameplate and/or the unit Service Facts. Field

SSP-SVX15C-EN

19

NSB P anel

Zone

Sensor

T’stat

Air Handler

Disconnect S witch

(By Others)

Disconnect S witch

(By Others) Note 2

Electric

Heat Accessory

Disconnect S witch

(By Others)

Note 2

B

A

B

D

F

EC

IInnssttaallllaattiioonn

wiring diagrams for accessories are shipped with the accessory.

Unit Power Supply

The installer must provide line voltage circuit(s) to the unit main power terminals as shown by the unit wiring diagrams (available through e-Library or by contacting a local sales office) or field wiring. Power supply must include a disconnect switch in a location convenient to the unit. Ground the unit according to local codes and provide flexible conduit if codes require and/or if vibration transmission may cause noise problems.

IImmppoorrttaanntt:: All wiring must comply with applicable

local and national (NEC) codes. Type and location of disconnect switches must comply with all applicable codes.

WWAARRNNIINNGG

PPrrooppeerr FFiieelldd WWiirriinngg aanndd GGrroouunnddiinngg RReeqquuiirreedd!!

FFaaiilluurree ttoo ffoollllooww ccooddee ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy.. AAllll ffiieelldd wwiirriinngg MMUUSSTT bbee ppeerrffoorrmmeedd bbyy qquuaalliiffiieedd ppeerrssoonnnneell.. IImmpprrooppeerrllyy iinnssttaalllleedd aanndd ggrroouunnddeedd ffiieelldd wwiirriinngg ppoosseess FFIIRREE aanndd EELLEECCTTRROOCCUUTTIIOONN hhaazzaarrddss.. TToo aavvooiidd tthheessee hhaazzaarrddss,, yyoouu MMUUSSTT ffoollllooww rreeqquuiirreemmeennttss ffoorr ffiieelldd wwiirriinngg iinnssttaallllaattiioonn aanndd ggrroouunnddiinngg aass ddeessccrriibbeedd iinn NNEECC aanndd yyoouurr llooccaall// ssttaattee eelleeccttrriiccaall ccooddeess..

ReliaTel™™ Controls

Wiring shown with dashed lines is to be furnished and installed by the customer. All customer supplied wiring must be copper only and must conform to NEC and local electrical codes. Codes may require line of sight between disconnect switch and unit.

NNootteess::

1. When electric heater accessory is used, single point power entry or dual point power entry is field optional. Single point power entry option is through electric heater only.

2. ***Choose only one of the following; Thermostat, Zone Sensor, or NSB Panel.

Figure 12. ReliaTel jobsite connections

NNOOTTIICCEE

UUssee CCooppppeerr CCoonndduuccttoorrss OOnnllyy!!

FFaaiilluurree ttoo uussee ccooppppeerr ccoonndduuccttoorrss ccoouulldd rreessuulltt iinn eeqquuiippmmeenntt ddaammaaggee aass uunniitt tteerrmmiinnaallss aarree nnoott ddeessiiggnneedd ttoo aacccceepptt ootthheerr ttyyppeess ooff ccoonndduuccttoorrss..

Low Voltage Wiring

Mount the indoor thermostat, zone sensor, or Night Setback Panel (NSB) in accordance with the corresponding thermostat installation instructions. Install color-coded, weather-proof, multi-wire cable according to the field wiring schematics (see ”Field

Wiring”, p. 21).

20

A.

3 power wires, line voltage for 3 phase, (2 power wires for single phase)

B. 3 power wires, line voltage for 3 phase, (2 power wires for

single phase)

C. Heat Pump thermostat: 5 to 8 wires depending on stages of

electric heat

D. 3 to 7 wires depending on type of outdoor unit(s)

E. Zone Sensor: 4 to 10 wires depending on zone sensor model

F. Night Setback Panel: 7 wires

(a)

For SZVAV air handlers: 4 additional wires are required (2 of which require twisted pair or shielded wire) in order to make connections between ReliaTel boards in the condenser and air handler.

SSP-SVX15C-EN

(a)

Field Wiring

Figure 13. Night setback panel field wiring

IInnssttaallllaattiioonn

Figure 14. Zone sensor field wiring

SSP-SVX15C-EN

21

X

Note A

S

D

COMPRESSOR

Note A

OUTDOOR COIL

INDOOR COIL

AIR

TXV

Note A

FILTER DRIER

TXV

FIELD SUPPLIED

INTER-CONNECTING

TUBING

EQUALIZER

TUBE

EXPANSION

VALVE BULB

CHECK VALVES

GAUGE

CONNECTION

HIGH PRESSURE

SWITCH (HPCO)

DISCHARGE TEMPERATURE LIMIT(DTL)

LOW PRESSURE SWITCH (LPCO)

SERVICE

VALVE

SERVICE

VALVE

EXPANSION

VALVE BULB

4-WAY

SWITCHOVER

VALVE

EQUALIZER

LINE

NOTE A: ONLY ONE OUTDOOR AND INDOOR COIL REFRIGERANT ENTRY AND EXIT CIRCUIT IS SHOWN. ALL MODELS HAVE MULTIPLE ENTRY AND EXIT CIRCUITS.

HEAT PUMP CIRCUIT DIAGRAM

COOLING MODE

INDICATES DIRECTION OF REFRIGERANT FLOW

NOTE B: DUAL CIRCUIT MODELS HAVE 2 REFRIGERATION CIRCUITS.

V

IInnssttaallllaattiioonn

Figure 15. Thermostat field wiring

Refrigerant Circuit

Figure 16. Typical split system heat pump - cooling - refrigerant circuit

22

SSP-SVX15C-EN

Figure 17. Typical split system heat pump - heating - refrigerant circuit

NOTE A

TXV

S

D

COMPRESSOR

NOTE A

FIELD SUPPLIED

INTER-CONNECTING

TUBING

EQUALIZER

LINE

OUTDOOR COIL

INDOOR COIL

AIR HANDLER

AIR

TXV

SERVICE

VALVE

EXPANSION

VALVE BULB

SERVICE VALVE

GAUGE

CONNECTIONS

DISCHARGE TEMPERATURE LIMIT (DTL)

HIGH PRESSURE SWITCH (HPCO)

DE-ICE LOOP

NOTE A

CHECK VALVES

4-WAY

SWITCHOVER

VALVE

LOW PRESSURE SWITCH (LPCO)

EQUALIZER

LINE

NOTE A: ONLY ONE OUTDOOR AND INDOOR COIL REFRIGERANT ENTRY AND EXIT CIRCUIT IS SHOWN. ALL MODELS HAVE MULTIPLE ENTRY AND EXIT CIRCUITS.

INDICATES DIRECTION OF REFRIGERANT FLOW

HEAT PUMP CIRCUIT DIAGRAM

HEATING MODE

NOTE B: DUAL CIRCUIT MODELS HAVE 2 REFRIGERATION CIRCUITS.

V

FILTER DRIER

IInnssttaallllaattiioonn

SSP-SVX15C-EN

23

Electrical Data

Table 4. Electrical characteristics — motors — heat pumps — 60 Hz

Compressor Motor

Unit Model

Tons

Number

TWA090A3 1 208-230 3 22.4 164 1 208-230 1 3.1 8.1

7.5 TWA090A4 1 460 3 10.9 100 1 460 1 1.6 3.8

TWA120A3 1 208-230 3 30.1 225 1 208-230 1 5.0 14.4

10

TWA120A4 1 460 3 15.5 114 1 460 1 2.5 5.8

TWA180B3 1 208-230 3 22.4 164 2 208-230 2 5.0 14.4

15

TWA180B4 1 460 3 10.9 100 2 460 2 2.5 5.8

TWA240B3 1 208-230 3 30.1 225 2 208-230 2 5.0 14.4

20

TWA240B4 1 460 3 15.5 114 2 460 2 2.5 5.8

Note: Electrical characteristics reflect nameplate values and are calculated in accordance with cULus and ARI specifications.

No. Volts Phase

Amps

RLA LRA FLA LRA

(Ea.) (Ea.) (Ea.) (Ea.)

Table 5. Unit wiring — heat pumps — 60 Hz

Tons

7.5

10

15

20

Note: HACR type circuit breaker per NEC.

Unit Model

Number

TWA090A3 187-253 31.1 45

TWA090A4 414-506 15.2 25

TWA120A3 187-253 42.6 60

TWA120A4 414-506 21.9 30

TWA180B3 187-253 60.4 80

TWA180B4 414-506 29.5 40

TWA240B3 187-253 77.7 100

TWA240B4 414-506 39.9 50

Unit Operating

Voltage Range

Minimum Circuit

Ampacity

Condenser Fan Motor

Amps

No. Volts Phase

Maximum Fuse or HACR

Circuit Breaker Size

24

SSP-SVX15C-EN

Charging Charts and Superheat

25

150

175

200

225

250

275

300

325

350

375

400

55 6 0 65 70 7 5 80 85 90 95 100 105 110 115 120 125 130 135 140

Discharg e P re ss u re, ps ig

Liqu id Te mp era tu re Le av ing OD Co il, °F

TWA090A Charging Curve

A

dd c ha rg e

em ove

ch arge

25

150

175

200

225

250

275

300

325

350

375

400

425

55 6 0 65 70 7 5 80 85 90 95 100 105 110 115 120 125 130 135 140

Discharg e P re ss u re, ps ig

Liqu id Te mp era tu re Le av ing OD Co il, °F

TWA120A Charging Curve

A

dd c ha rg e

em ove

ch arge

25

150

175

200

225

250

275

300

325

350

375

400

425

55 6 0 65 70 7 5 80 85 90 95 100 105 110 115 120 125 130 135 140

Discharg e P re ss u re, ps ig

Liqu id Te mp era tu re Le av ing OD Co il, °F

TWA180B Charg ing Curve

A

dd c ha rg e

em ove

ch arge

25

150

175

200

225

250

275

300

325

350

375

400

425

55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 1 30 135 140

Discharg e P ress ur e, p s ig

Liqu id Te mpera ture Le aving OD Co il, °F

TWA240B Charg ing Cu rve

A

dd c ha rge

em ove

ch ar ge

Figure 18. TWA090A

Figure 19. TWA120A

Figure 20. TWA180B

Figure 21. TWA240B

Table 6. TWA superheat with matched TWE air handler

Condenser Air Handler

TWA090A TWE090A 16.0 — 15.7 —

TWA120A TWE120A 16.3 — 13.1 —

TWA180B TWE180B 15.5 15.5 12.2 12.2

TWA240B TWE240B 14.7 14.7 11.4 11.4

Notes:

1. An adjustable TXV is provided for each circuit in the TWE and TWA models. If the application causes the superheat to deviate from the values shown above by more than 1 degree - after the system has achieved steady state - the TXV should be adjusted to provide the values shown as measured at the compressor.

2. The values given above have been tested and are approved for the matched sets shown. If an alternate combination is used, an expansion device should be used that provides 16-20°F degrees of superheat measured at the compressor.

3. Check and adjust superheat using this table, then compare with charging chart to determine if charge corrections are necessary.

SSP-SVX15C-EN

Cooling Superheat Heating Superheat

Circuit 1 Circuit 2 Circuit 1 Circuit 2

25

Installation Checklist

Complete this checklist once the unit is installed to verify that all recommended procedures have been accomplished before starting the system. Do not operate the system until all items covered by this checklist are complete.

Inspect unit location for proper required service clearances.

Inspect unit location for proper free air clearances.

Inspect unit location for secure, level mounting position.

Refrigerant Piping

Properly sized/constructed liquid and suction lines connected to stubs at both the indoor and outdoor units?

Insulated the entire suction line?

Insulated portions of liquid line exposed to extremes in temperature?

Performed initial leak test?

Evacuated each refrigerant circuit to 500 microns?

Charged each circuit with proper amount of R-22?

Electrical Wiring

Provided unit power wiring (with disconnect) to proper terminals in the unit control section?

Installed system indoor thermostat?

Installed system low voltage interconnecting wiring to proper terminals of outdoor unit, indoor unit and system thermostat?

26

SSP-SVX15C-EN

Pre-Start

Control Circuit Features

NNoottee:: Not all of these features may be required for your

unit, check electrical schematic.

Discharge Temperature Limit (DTL)

The control’s sensor is located on the discharge line. This device will shut off the compressor and the outdoor fan(s) if the discharge temperature exceeds the DTL setting. Once the discharge temperature has returned to normal, the compressor will cycle back on.

Evaporator Defrost Control (EDC)

This control is located in the Air Handler. The control’s sensing tube is embedded vertically in the evaporator coil, near the center. This device will stop the compressor if the indoor coil temperature drops below its setting. The indoor air will still circulate across the coil bringing the temperature of the coil back up to the cut-in temperature of the evaporator defrost control.

Low Pressure Cut-Out (LPCO)

This control’s sensor is located in the suction (gas) line, near the compressor. This control will stop the compressor and the outdoor fans if suction pressure drops below the Low Pressure Cut-Out setting. Once the suction pressure has returned to normal, the compressor and outdoor fans will cycle back on.

High Pressure Cut-Out (HPCO)

This control’s sensor is located in the discharge line. This device will shut off the compressor and the outdoor fan(s) if the discharge pressure exceeds the High Pressure Cut-Out’s setting. Once the discharge pressure has returned to normal, the compressor will cycle back on.

WWAARRNNIINNGG

PPrreevveenntt IInnjjuurryy!!

DDuuee ttoo aaggeennccyy ssaaffeettyy rreeqquuiirreemmeennttss,, nnoo sscchhrraaddeerr ccoorree iiss ttoo bbee iinnssttaalllleedd bbeenneeaatthh tthhee HHPPCCOO.. RReemmoovvaall ooff tthhee HHPPCCOO wwiitthhoouutt eevvaaccuuaattiinngg tthhee ssyysstteemm cchhaarrggee ccoouulldd ccaauussee iinnjjuurryy aanndd rreelleeaassee ooff rreeffrriiggeerraanntt..

Internal Overload Protector (IOL)

This device is embedded in the compressor. It will shut off the compressor if the discharge temperature of the compressor exceeds its design trip temperature.

NNoottee:: The IOL will put the compressor back in

operation once the compressor motor heat has dropped below the trip setting; however, a check of the refrigerant and electrical systems should be made to determine the cause and be corrected.

SSP-SVX15C-EN

27

Start-Up

ReliaTel™™ Controls

The ReliaTel™ Control is a microelectronic control feature, which provides operating functions that are significantly different than conventional Electromechanical units. The ReliaTel™ Refrigeration Module (RTRM) uses proportional/integral control algorithms to perform specific unit functions that govern the unit operation in response to application conditions.

The RTRM provides compressor anti-short cycle (ASC) timing functions through minimum““OOffff”” and ““OOnn”” timing to increase reliability, performance and to maximize unit efficiency. Upon power initialization, the RTRM performs self-diagnostic checks to insure that all internal controls are functioning. It also checks the configuration parameters against the components connected to the system. The system LED located on the RTRM module is turned ““OOnn”” within one second after power-up if all internal operations are correct.

The heating and cooling cycles of the heat pump are automatic for Heat and Cool functions when using an optional automatic changeover thermostat (TS).

The fan switch on the optional automatic changeover thermostat can be placed in either the OONN position, causing continuous evaporator (indoor) fan operation, or the AAUUTTOO position causing fan operation to coincide with heating or cooling run cycles. (In AAUUTTOO position, the fan switch automatically changes to Heat or Cool in response to sufficient room temperature change.)

Terminology

The following terms and acronyms may be used in this section.

ASC

CC

CCH Crankcase Heater

CF

CHR

Anti-Short Cycle Timer

Compressor Contactor

Outdoor Fan Capacitor

Crankcase Heater Relay

COMM Communication Interface Module

CPR

CTS

DTL

EDC

FTB Outdoor Fan Terminal Block

HPC

HTB

LPC Low Pressure Cutout Switch

LTB

OAS

ODF

ODM Outdoor Fan Motor

PM Phase Monitor

RTRM

SOV Switchover Valve

TNS Transformer

Compressor

Coil Temperature Sensor

Discharge Temperature Limit Switch

Evaporator Defrost Control Switch

High Pressure Cutout Switch

High Voltage Terminal Block

Low Voltage Terminal Board

Outdoor Air Temperature Sensor

Outdoor Fan Relay

ReliaTel ™ Refrigeration Module

Functions and Features

These subsections describe the following key heat pump functions and features:

• Processing Activated When the Disconnect Switch is in OONN Position

• Mechanical Heat

• Auxiliary Heat

• Emergency Heat

• Cooling

• Demand Defrost

Processing Activated When the Disconnect Switch is in the ON Position

The following table lists the processing that occurs given the stated condition.

28

SSP-SVX15C-EN

SSttaarrtt--UUpp

Condition

If the disconnect switch is in the

ON position…

Resulting Operations

1. Current is supplied to the compressor crankcase heater(s) (CCH) through the normally closed contacts of the crankcase heater relay (CHR) when the compressor is not running.

2. The phase monitor (PM) is powered.

3. The phase monitor (PM) looks at the incoming power to verify that there is no reversed phase, no phase imbalance, and no loss of phase. If the phase monitor detects any of these three conditions, it will shut off control voltage.

4. The control transformer (TNS) is powered.

5. The ReliaTel ™ control board (RTRM) is powered and performs self-diagnostic checks to insure that all internal controls are functioning.

6. The ReliaTel ™ control board (RTRM) checks the configuration parameters against the components connected to the system.

7. The system LED located on the RTRM module is turned ON within one second after power-up if all internal operations are correct.

8. The communications board (COMM) is powered if installed.

9. The indoor thermostat (TS) is powered.

Mechanical Heat

In Heat mode the switchover valve (SOV) is turned OOFFFF. When a request for heating occurs, the control system turns OONN the mechanical heat (compressors) to perform heating. Dual circuit heat pumps are factory configured to have 2-step mechanical heating enabled (RTRM J4-3 tied to ground).

The staging sequence depends on the type of mechanical heating that is enabled.

• If 1-Step mechanical heating is enabled (RTRM J4-3 not tied to ground), the unit will stage according to

Table 9, p. 31, as a result of the proportional/

integral control algorithms.

• Units with 2-step mechanical heating will stage according to Table 10, p. 31, as a result of the proportional/integral control algorithms.

With mechanical heating, when a heat request is turned OONN, the Indoor Fan request is turned OONN. When the heat request is turned OOFFFF, the Indoor Fan request is turned OOFFFF after a specified delay (60 seconds on all dual-compressor units and 80 seconds on all single compressor units). See Table 7, p. 30, Table 8, p. 31,

Table 9, p. 31, and Table 10, p. 31 in this document for

the staging, sequence, and control.

Auxiliary Heat

Auxiliary Heat is factory disabled on all Odyssey units (Jumper placed between J2-1 and J2-2 RTRM inputs). If configured (Jumper wire cut or removed between J2-1 and J2-2 on RTRM) and installed, Auxiliary Heat is enabled or disabled by Smart Recovery.

Smart Recovery

Smart Recovery dictates that if the Active Zone Temperature is making a recovery using only mechanical heating toward the setpoint at a rate of at least 6°F/hour (0.1°F/minute), the electric heat is disabled. If Smart Recovery is not disabling electric heat, an approximate 9 minute stage-up delay (plus or minus a few minutes) is provided for each stage to allow time for recovery to begin. Stages of electric heat are enabled and energized as necessary to meet heating demand. When the request for Auxiliary Heat is removed, the Indoor Fan request is turned OOFFFF at the same time as the Electric Heat Stages. See Table 7, p.

30, Table 8, p. 31, Table 9, p. 31, and Table 10, p. 31 for

the staging, sequence, and control.

All split system units are also configured from the factory for only 1-Stage of Electric Heat (Jumper placed between J1-3 and J1-6 RTRM inputs). To enable two stages of Electric Heat, cut or remove the jumper between J1-3 and J1-6 RTRM inputs.

Emergency Heat

When Emergency Heat mode is requested and Auxiliary Electric Heat is configured and installed, only the Auxiliary Electric Heat will be turned OONN to satisfy the Heat request. Mechanical heat will be held OOFFFF. When the request for Emergency Heat is initiated, the Indoor Fan request is turned OONN 1 second before the electric heat stages are activated. See Table 7, p. 30,

Table 8, p. 31, Table 9, p. 31, and Table 10, p. 31for the

staging, sequence, and control.

Cooling

With a request for Cooling, the RTRM stages the circuits and control normally for single and dual stage

SSP-SVX15C-EN

29

SSttaarrtt--UUpp

cooling applications. If the unit is configured with a zone sensor, switchover valve 1 (SOV1) and switchover valve 2 (SOV2) are energized for the duration of the Cooling mode and do not change states until the unit either enters OOFFFF mode or transitions to Heat mode. If the unit is controlled with a thermostat, SOV1 and SOV2 are energized while the thermostat W1/O signal output to the RTRM is active.

The outdoor fans (ODF) will turn OONN and OOFFFF with the compressors. Circuit 1 fan cycles with compressor 1 and circuit 2 fan will cycle with compressor. If a compressor is turned OOFFFF, the anti-short cycle timer (ASC) will hold the compressor OOFFFF for 3 minutes. See

Table 7, p. 30, Table 8, p. 31, Table 9, p. 31, and Table 10, p. 31 for the staging, sequence, and control.

Demand Defrost

When power is first applied to the unit, the first demand-defrost cycle will be initiated based on a cumulative run time of exactly 30 minutes only at the required conditions. The cumulative run time at the required conditions is tracked separately for each compressor.

Shortly after completion of the first defrost cycle, the system control calculates the temperature difference between the outdoor coil and outdoor air, using the result as an indicator of unit performance at dry coil conditions.

Conditions Triggering the Defrost Cycle

Over time, as moisture and frost accumulate on the coil, the coil temperature will drop, increasing the temperature difference. When the temperature difference is large enough, a defrost cycle is initiated. Demand Defrost is initiated when the outdoor air temperature (OAS) is below 52°F and the outdoor coil temperature (CTS) is below 33°F.

Single and Dual Circuits

When a circuit enters Defrost mode, the compressor will remain energized, the associated outdoor fan (ODF) will de-energize, the associated switchover valve (SOV) output will energize, and the first stage of Auxiliary Heat energizes.

On dual circuit units, the opposite circuit's state will remain unchanged if a defrost cycle has not been initiated on that circuit. Each circuit will enter defrost independently based on its associated Outdoor Coil Temperature Sensor (CTS), the Outdoor Air Temperature Sensor (OAS), and its total accumulated run time.

Termination of the Defrost Cycle

A circuit will leave defrost, during normal conditions, once the outdoor coil temperature reaches the outdoor air temperature + 47°F which must be above 57°F and not greater than 72°F. Termination of the defrost cycle includes a "Soft Start" delay of 5 seconds for the switchover valve (SOV) where the outdoor fans (ODF) are turned on 5 seconds before the switchover valve (SOV) is returned to the heating position to help smooth the transition.

Behavior of Switchover Valves

The switchover valves (SOV) will both be energized during cooling mode and will be de-energized during Heat or OOFFFF mode. However, during a defrost cycle, only the circuit that requires a defrost cycle will energize its switchover valve (SOV). For thermostat control, if a thermostat is requesting for the switchover (SOV) to be energized or de-energized, both switchover valve (SOV) outputs will follow the thermostat request (unless a circuit is in a defrost cycle).

Defrost Configuration Facts

Units are configured from the factory to have Independent Circuit defrost (RTRM input J9-3 tied to ground with RTRM input J1-5 OPEN).

Table 7. Heat pump operation with thermostat

Inputs Outputs

Y1 Y2 G W1 W2 O X2 Cool Heat1 Indoor Fan

ON OFF

OFF ON

ON ON

ON OFF

OFF ON

ON ON

30

Don't Care

OFF HEAT OFF OFF

ON HEAT OFF OFF

Stage 1

Stage 2

Stage 1 +

Stage 2

Stage 1 +

Auxiliary

Stage 2 +

Auxiliary

Stage 1 + Stage 2 +

Auxiliary

SSP-SVX15C-EN

ON

Table 7. Heat pump operation with thermostat (continued)

Inputs Outputs

SSttaarrtt--UUpp

Y1 Y2 G W1 W2 O X2

Don't

Care

Note: Stage 1 = Circuit 1 and Stage 2 = Circuit 2

Don't

Care

Don't Care

Don't

Care

Don't

Care

Table 8. Heat pump operation with a zone sensor

with lead/lag enabled

Heating Request Circuit Output

0 (None)

1 Circuit 1

2 Circuit 2 + Circuit 1

3

4

All Off

Auxiliary Heat 1

Auxiliary Heat 2

ON OFF Em Heat ON

Table 8. Heat pump operation with a zone sensor with lead/lag enabled (continued)

Heating Request Circuit Output

0 (None)

Cool Heat1 Indoor Fan

All Off

1 Circuit 2 + Circuit 1

2 Circuit 1 + Circuit 2

3

4

Auxiliary Heat 1

Auxiliary Heat 2

Table 9. Heat pump control (1-step mechanical heating)

Active Unit

Mode

Heat/Off

Heat

Emergency

Heat

Emergency

Heat

Heat Defrost On

Cool Don’t Care Off Off Off Off On On

(a)

Only units configured as an independent circuit heat pump will control the switchover valve 2 output.

(b)

On units with independent circuits, only the circuit whose conditions are correct for defrost will enter defrost mode and energize the switchover valve. The other circuit's switchover valve will remain in its previous state until it has a defrost request or until the unit mode changes.

Stage

Off Off Off Off Off Off Off

Stage 1

Auxiliary 1

Auxiliary 2

Stage 1

Stage 2

Indoor Fan

On

On Off On Off Off Off

On Off On On Off Off

Compressor

Both

Compressors

Both

Compressors

Both

Compressors

Both

Compressors

Auxiliary

Heat 1

Off Off Off Off

On Off Off Off

On On Off Off

On Off

Auxiliary

Heat 2

Switchover

Valve 1

(b)

On

Switchover

Valve 2

On

(a)

(b)

Table 10. Heat pump control (2-step mechanical heating)

Active Unit

Mode

Heat/Off

Heat

SSP-SVX15C-EN

Stage

Off Off Off Off Off Off Off

Stage 1

Stage 2

Auxiliary 1

Auxiliary 2

Indoor Fan

On

Compressor

Compressor 1

Both

Compressors

Both

Compressors

Both

Compressors

Auxiliary

Heat 1

Off Off Off Off

On Off Off Off

On On Off Off

Auxiliary

Heat 2

Switchover

Valve 1

Switchover

Valve 2

(a)

31

SSttaarrtt--UUpp

Table 10. Heat pump control (2-step mechanical heating) (continued)

Active Unit

Mode

Emergency

Heat

Emergency

Heat

Heat Defrost On

Cool Don’t Care Off Off Off Off On On

(a)

Only units configured as an independent circuit heat pump will control the switchover valve 2 output.

(b)

On units with independent circuits, only the circuit whose conditions are correct for defrost will enter defrost mode and energize the switchover valve. The other circuit's switchover valve will remain in its previous state until it has a defrost request or until the unit mode changes.

Stage

Stage 1

Stage 2

Indoor Fan

On Off On Off Off Off

On Off On On Off Off

Compressor

Both

Compressors

Auxiliary

Heat 1

On Off

Auxiliary

Heat 2

Switchover

Valve 1

(b)

On

Switchover

Valve 2

On

(a)

(b)

32

SSP-SVX15C-EN

Service Test Modes for ReliaTel™™ Controls

Test Modes

Upon power initialization, the RTRM performs selfdiagnostic checks to ensure that all internal controls are functional. It also checks the configuration parameters against the components connected to the system. The system LED located on the RTRM module is turned ““OOnn”” within one second of power-up if internal operation is okay.

Use one of the following ““TTeesstt”” procedures to bypass

Step Test Mode

This method initiates the different components of the unit, one at a time, by temporarily shorting across the two test terminals for 2 to 3 seconds.

For the initial start-up of the unit, this method allows the technician to cycle a component ““OOnn”” and have up to one hour to complete the check. Service Test Mode will be ignored if a short is present across Test 1 and

Test 2 at start-up. some time delays and to start the unit at the control panel. Each step of unit operation can be activated individually by temporarily shorting across the ““TTeesstt”” terminals for 2 to 3 seconds. The system LED located on the RTRM module will blink when the test mode has been initiated. The unit can be left in any ““TTeesstt”” step for up to one hour before it will automatically terminate, or it can be terminated by opening the main power disconnect switch. Once the test mode has been terminated, the system LED will glow continuously and

Resistance Test Mode

This method can be used for start-up when a decade

box for variable resistance outputs is available. This

method initiates the different components of the unit,

one at a time, when a specific resistance value is placed

across the two test terminals. The unit will remain in

the specific test mode for approximately one hour even

though the resistance is left on the test terminals.

the unit will revert to the ““SSyysstteemm”” control.

There are three methods in which the ““SSeerrvviiccee TTeesstt”” can be cycled at LTB-Test 1(T1) and LTB-Test 2 (T2).

Table 11. Test mode states for SZVAV independent circuit heat pump units with auxiliary electric heat

TEST STEP MODE

1 FAN ON ON

2 COOL 1 ON

3 COOL 2 ON

4 HEAT 1 ON

5 HEAT 2 ON

6 Heat 3 ON

7 Heat 4 ON

8 Defrost ON

9

Emergency Heat

FA-

N VFD COMMAND COMP 1 COMP 2 HEAT 1 HEAT 2

58% (0 - 2.8 VDC)

86% (3.8 - 7.7 VDC)

100% (5.6 - 10 VDC)

ON

OFF OFF OFF OFF OFF OFF 2.2K

ON OFF OFF OFF ON ON 4.7K

ON ON OFF OFF ON ON 6.8K

ON OFF OFF OFF OFF OFF 10K

ON ON OFF OFF OFF OFF 15K

ON ON ON OFF OFF OFF 22K

ON ON ON ON OFF OFF 27K

ON ON ON OFF ON ON 33K

OFF OFF ON ON OFF OFF 47K

SO-V1SO-

V2 OHMS

Auto Test Mode

This method is not recommended for start-up due to the short timing between individual component steps. This method initiates the different components of the unit, one at a time, when a fixed jumper is installed across the test terminals.

SSP-SVX15C-EN

The unit will start the first test step and change to the

next step every 30 seconds. At the end of the test

mode, control of the unit will automatically revert to the

applied ““SSyysstteemm”” control method. For unit test steps,

test modes, and step resistance values to cycle the

various components, refer to Table 11, p. 33.

33

Troubleshooting

Troubleshooting ReliaTel™ Controls

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The RTRM has the ability to provide the service personnel with some unit diagnostics and system status information.

Before turning the main power disconnect switch ““OOffff,,”” follow the steps below to check the ReliaTel™ Refrigeration Module (RTRM). All diagnostics & system status information stored in the RTRM will be lost when the main power is turned ““OOffff””.

To prevent injury or death from electrocution, it is the responsibility of the technician to recognize this hazard and use extreme care when performing service procedures with the electrical power energized.

NNoottee:: The J6 & J7 screw terminals must be tightened

in order to accurately measure voltage in the required steps.

1. Verify that the system LED on the RTRM is burning

continuously. If the LED is lit, go to Step 3.

2. If the LED is not lit, verify that 24 VAC is present

between J1-1 and J1-2. If 24 VAC is present, proceed to Step 3. If 24 VAC is not present, check the unit main power supply, check transformer (TNS1). Proceed to Step 3 if necessary.

3. Utilizing ”Method 1”, p. 34 or ”Method 2”, p. 35 in

the System Status Checkout Procedure section, check the following:

• System status

• Heating status

• Cooling status

NNoottee:: If a System failure is indicated, proceed to

Step 4. If no failures are indicated, proceed to Step 5.

4. If a System failure is indicated, recheck Step 1 and

Step 2. If the LED is not lit in Step 1, and 24 VAC is present in Step 2, then the RTRM has failed. Replace the RTRM.

5. If no failures are indicated, use one of the TEST

mode procedures described in the ”Service Test

Modes chapter,” p. 33 to start the unit. This

procedure will allow you to check all of the RTRM

outputs, and all of the external controls (relays, contactors, etc.) that the RTRM outputs energize, for each respective mode. Proceed to Step 6.

6. Step the system through all of the available modes, and verify operation of all outputs, controls, and modes. If a problem in operation is noted in any mode, you may leave the system in that mode for up to one hour while troubleshooting. Refer to the sequence of operations for each mode, to assist in verifying proper operation. Make the necessary repairs and proceed to Step 7 and Step 8.

7. If no abnormal operating conditions appear in the test mode, exit the test mode by turning the power ““OOffff”” at the main power disconnect switch.

8. Refer to the individual component test procedures if other microelectronic components are suspect.

System Status Checkout Procedure

““SSyysstteemm SSttaattuuss”” is checked by using one of the following two methods:

Method 1

If the Zone Sensor Module (ZSM) is equipped with a remote panel with LED status indication, you can check the unit within the space. If the ZSM does not have LED’s, use ”Method 2”, p. 35. BAYSENS010B, BAYSENS011B, BAYSENS119A, BAYSENS020A, BAYSENS021A, BAYSENS023A, BAYSENS109 and BAYSENS110 all have the remote panel indication feature. The LED descriptions are listed below.

• LLEEDD 11 ((SSyysstteemm))

– ““OOnn”” during normal operation.

– ““OOffff”” if a system failure occurs or the LED fails.

– ““FFllaasshhiinngg”” indicates test mode

• LLEEDD 22 ((HHeeaatt))

– ““OOnn”” when the heat cycle is operating.

– ““OOffff”” when the heat cycle terminates or the LED

fails.

– ““FFllaasshhiinngg”” indicates a heating failure.

• LLEEDD 33 ((CCooooll))

– ““OOnn”” when the cooling cycle is operating.

– ““OOffff”” when the cooling cycle terminates or the

LED fails.

– ““FFllaasshhiinngg”” indicates a cooling failure.

The following information describes the complete listing of failure indication causes.

34

SSP-SVX15C-EN

TTrroouubblleesshhoooottiinngg

System Failure

Check the voltage between terminals 6 and 9 on J6, it should read approximately 32 VDC. If no voltage is present, a System failure has occurred. Refer to Step 4 in the previous section for the recommended troubleshooting procedure.

Cooling Failure

1. Cooling and heating set point (slide pot) on the zone sensor has failed. Refer to the ”Programmable

& Digital Zone Sensor Test”, p. 37.

2. Zone temperature thermistor ZTEMP on ZTS failed. Refer to the ”Programmable & Digital Zone Sensor

Test”, p. 37.

3. CC1 or CC2 24 VAC control circuit has opened, check CC1 & CC2 coils, and any of the controls below that apply to the unit (HPC1, HPC2, DTL1, DTL2).

4. LPC1 has opened during the 3 minute minimum “on time” during 4 consecutive compressor starts, check LPC1 or LPC2 by testing voltage between the J1-8 & J3-2 terminals on the RTRM and ground. If 24 VAC is present, the LPCs have not tripped. If no voltage is present, LPCs have tripped.

Simultaneous Heat and Cool Failure

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• Emergency Stop is activated.

Method 2

The second method for determining system status is done by checking voltage readings at the RTRM (J6). The system indication descriptions and the approximate voltages are listed below.

System Failure

Measure the voltage between terminals J6-9 & J6-6.

• NNoorrmmaall OOppeerraattiioonn = approximately 32 VDC

• SSyysstteemm FFaaiilluurree = less than 1 VDC, approximately

0.75 VDC

• TTeesstt MMooddee = voltage alternates between 32 VDC &

0.75 VDC

Heat Failure

Measure the voltage between terminals J6-7 & J6-6.

• HHeeaatt OOppeerraattiinngg = approximately 32 VDC

• HHeeaatt OOffff = less than 1 VDC, approximately 0.75 VDC

• HHeeaattiinngg FFaaiilluurree = voltage alternates between 32 VDC & 0.75 VDC

Cool Failure

Measure the voltage between terminals J6-8 & J6-6.

• CCooooll OOppeerraattiinngg = approximately 32 VDC

• CCooooll OOffff = less than 1 VDC, approximately 0.75 VDC

• CCoooolliinngg FFaaiilluurree = voltage alternates between 32 VDC & 0.75 VDC

To use LED’s for quick status information at the unit, purchase a BAYSENS010B ZSM and connect wires with alligator clamps to terminals 6 through 10. Connected each respective terminal wire (6 through 10) from the Zone Sensor to the unit J6 terminals 6 through 10.

NNoottee:: If the system is equipped with a programmable

zone sensor, (BAYSENS119A, or BAYSENS023A), the LED indicators will not function while the BAYSENS010A is connected.

Resetting Cooling and Heating Lockouts

Cooling Failures and Heating Lockouts are reset in an identical manner.”Method 1”, p. 35 explains resetting the system from the space; ”Method 2”, p. 35 explains resetting the system at the unit.

NNoottee:: Before resetting Cooling Failures and Heating

Lockouts check the Failure Status Diagnostics by the methods previously explained. Diagnostics will be lost when the power to the unit is disconnected.

Method 1

To reset the system from the space, turn the MMOODDEE selection switch at the zone sensor to the OOFFFF position. After approximately 30 seconds, turn the MMOODDEE selection switch to the desired mode, i.e. HHEEAATT, CCOOOOLL, or AAUUTTOO.

Method 2

To reset the system at the unit, cycle the unit power by turning the disconnect switch OOFFFF and then OONN

Lockouts can be cleared through the building management system. Refer to the building management system instructions for more information.

Zone Temperature Sensor (ZTS) Service Indicator

The ZSM SERVICE LED is a generic indicator that will signal the closing of a Normally Open switch at any time, providing the Indoor Motor (IDM) is operating.

SSP-SVX15C-EN

35

TTrroouubblleesshhoooottiinngg

This indicator is usually used to indicate an airside fan failure.

The RTRM will ignore the closing of this Normally Open switch for 2 (±1) minutes. This helps prevent nuisance SERVICE LED indications.

Temperature Tests

NNoottee:: These procedures are not for programmable or

digital models and are conducted with the Zone Sensor Module electrically removed from the system.

Test 1 - Zone Temperature Thermistor (ZTEMP)

This component can be tested by measuring the resistance between terminals 1 and 2 on the Zone Temperature Sensor. See Table 12, p. 36 for typical indoor temperatures, and corresponding resistive values.

Table 12. Typical indoor temperatures and values

Zone Temperature

50°F or 10.0°C 19.9 Kohms

55°F or 12.8°C 17.47 Kohms

60°F or 15.6°C 15.3 Kohms

Nominal Resistance

Table 12. Typical indoor temperatures and values (continued)

Zone Temperature

65°F or 18.3°C 13.49 Kohms

70°F or 21.1°C 11.9 Kohms

75°F or 23.9°C 10.50 Kohms

80°F or 26.7°C 9.3 Kohms

85°F or 29.4°C 8.25 Kohms

90°F or 32.2°C 7.3 Kohms

Nominal Resistance

Test 2 - Cooling Set Point (CSP) and Heating Set Point (HSP)

CCooooll SSPP = Terminals 2 and 3

Range = 100 to 900 Ohms approximate

HHeeaatt SSPP = Terminals 2 and 5

Range = 100 to 900 Ohms approximate

Test 3 - System Mode and Fan Selection

The combined resistance of the MMOODDEE selection switch and the FFAANN selection switch can be measured between terminals 2 and 4 on the Zone Sensor. The possible switch combinations are listed in Table 13, p.

36 with their corresponding resistance values.

Table 13. Test 3 - system mode and fan selection

Resistance Valves(Ohms)

2.32K

4.87K

7.68K

10.77K

13.32K

16.13K

19.48K

27.93K

35.0K

43.45K

Out of Range (Short)

Out of Range (Open) INVALID/Open Invalid (CV), Off (VAV)

Zone Sensor Unit/Fan

Mode Local Unit Mode Local Fan Mode

Off/Auto

Cool/Auto

Auto/Auto

Off/On

Cool/On

Auto/On

Heat/Auto

Heat/On

Emergency Heat/Auto Emergency Heat

Emergency Heat/On Emergency Heat

INVALID/Short

Off Auto

Cool Auto

Auto Auto

Off On

Cool On

Auto On

Heat Auto

Heat On

Invalid (CV), Auto (VAV)

Auto

On

Invalid

36

SSP-SVX15C-EN

TTrroouubblleesshhoooottiinngg

Test 4 - LED Indicator Test (SYS ON, HEAT, & COOL)

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Method 1

Testing the LED using a meter with diode test function. Test both forward and reverse bias. Forward bias should measure a voltage drop of 1.5 to 2.5 volts, depending on your meter. Reverse bias will show an Over Load, or open circuit indication if LED is functional.

Method 2

Testing the LED with an analog Ohmmeter. Connect Ohmmeter across LED in one direction, then reverse the leads for the opposite direction. The LED should have at least 100 times more resistance in reverse direction, as compared with the forward direction. If high resistance in both directions, LED is open. If low in both directions, LED is shorted.

Method 3

To test LED’s with ZSM connected to unit, test voltages at LED terminals on ZSM. A measurement of 32 VDC, across an unlit LED, means the LED has failed.

IImmppoorrttaanntt:: Measurements should be made from LED

common (ZSM terminal 6 to respective LED terminal).

Programmable & Digital Zone Sensor Test

J6-11.

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2. Disconnect wires from J6-11 and J6-12. Measure the voltage between J6-11 and J6-12, should be about 32 VDC.

3. Reconnect wires to terminals J6-11 and J6-12. Measure voltage again between J6-11 and J6-12, voltage should flash high and low every 0.5 seconds. The voltage on the low end will measure about 19 VDC, while the voltage on the high end will measure from approximately 24 to 38 VDC.

4. Verify all modes of operation, by running the unit through all of the steps in ”Service Test Modes for

ReliaTel Controls,” p. 33.

5. After verifying proper unit operation, exit the test mode. Turn the fan on continuously at the ZSM, by pressing the button with the fan symbol. If the fan comes on and runs continuously, the ZSM is good. If you are not able to turn the fan on, the ZSM is defective.

RLCI Loss of Communications

If the RLCI loses input from the building management system, the RTRM will control in the default mode after approximately 15 minutes. If the RTRM loses the Heating and Cooling setpoint input, the RTRM will control in the default mode instantaneously. The temperature sensing thermistor in the Zone Sensor Module is the only component required for the ““DDeeffaauulltt MMooddee”” to operate.

Testing Serial Communication Voltage

1. Verify 24 VAC is present between terminals J6-14 &

SSP-SVX15C-EN

37

Maintenance

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NNOOTTIICCEE

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Perform all of the indicated maintenance procedures at the intervals scheduled. This will prolong the life of the unit and reduce the possibility of costly equipment failure.

Monthly

Conduct the following maintenance inspections once per month.

Check unit wiring to ensure all connections are tight and that the wiring insulation is intact.

Inspect the condenser coils for dirt and debris. If the coils appear dirty, clean them.

With the unit operating in the cooling mode, check the suction and discharge pressures and compare them with Pressure Curve values in unit Service Facts. Record these readings on the ”Maintenance

Log”, p. 39.

Annually (Cooling Season)

The following maintenance procedures must be performed at the beginning of each cooling season to ensure efficient unit operation.

Perform all of the monthly maintenance inspections.

With the unit operating, check unit superheat and record the reading in the ”Maintenance Log”, p. 39.

Remove any accumulation of dust and/or dirt from the unit casing.

Remove corrosion from any surface and repaint. Check the gasket around the control panel door to ensure it fits correctly and is in good condition to prevent water leakage.

Inspect the control panel wiring to ensure that all connections are tight and that the insulation is intact.

NNoottee:: Condenser fan motors are permanently

lubricated.

Check refrigerant piping and fittings for leaks

Inspect the condenser coils for dirt and debris. If the coils appear dirty, clean them.

Coil Cleaning

Regular coil maintenance, including annual cleaningenhances the unit's operating efficiency by minimizing:

• compressor head pressure and amperage draw

• water carryover

• fan brake horsepower

• static pressure losses

At least once each year — or more often if the unit is located in a “dirty” environment — clean the coil using the instructions outlined below. Be sure to follow these instructions as closely as possible to avoid damaging the coils. To clean refrigerant coils, use a soft brush and a sprayer. Contact your local Parts Center for appropriate detergents.

1. Remove enough panels from the unit to gain safe access to coil.

2. Straighten any bent coil fins with a fin comb.

3. Remove loose dirt and debris from both sides of the coil with a soft brush.

4. Mix the detergent with water according to the manufacturer's instructions. If desired, heat the solution to 150° F maximum to improve its cleansing capability.

5. Pour the cleaning solution into the sprayer.

6. Spray the leaving-airflow side of the coil first; then spray the opposite side of the coil. Allow the cleaning solution to stand on the coil for five minutes.

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

8. Inspect both sides of the coil; if it still appears to be dirty, repeat Step 7 and 8.

9. Reinstall all of the components and panels removed in Step 1; then restore power to the unit.

10. Using a fin comb, straighten any coil fins that were inadvertently bent during the cleaning process.

38

SSP-SVX15C-EN

Maintenance Log

Subcooling (°F)

(at service valve)

Superheat (°F)

(at compressor)

Circuit #1 Circuit #2 Circuit #1 Circuit #2

MMaaiinntteennaannccee

Discharge Pressure

(C1) (C2) (C1) (C2)

Suction Pressure

Wet

Bulb

Dry

Bulb

Evaporator Entering Air Compressor

(°F)

Temp.

Ambient

SSP-SVX15C-EN

Date

Note: Perform each inspection once per month (during cooling season) while unit is operating

39

Wiring Diagram Matrix

Table 14. Wiring schematics R-22 heat pump

R–22 Unit

TWA090A30RGA 231304570100 231304610100

TWA090A40RGA 231304570100 231304610100

TWA120A30RGA 231304580100 231304620100

TWA120A40RGA 231304570100 231304610100

TWA180B30RGA 231304060100 231304290100

TWA180B40RGA 231304060100 231304290100

TWA240B30RGA 231304050100 231304300100

TWA240B40RGA 231304060100 231304290100

Note: Wiring diagrams are available through e-Library or by contacting your local sales office.

Power Diagram Connection Diagram

The manufacturer optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments, the manufacturer offers a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For more information, visit www.IRCO.com.

The manufacturer has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice.

SSP-SVX15C-EN

Supersedes SSP-SVX15B-EN (July 2012)

14 Jan 2014

We are committed to using environmentally

conscious print practices that reduce waste.

Trane TWA090A-G, TWA120A-G, TWA180B-G, TWA240B-G Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Model Number Description

Heat Pump Condenser

General Information

Unit Description

Pre-Installation

Unit Inspection

Inspection Checklist

Testing for Leaks

Lifting Recommendations

Clearances

Unit Mounting

Structural Preparation

Rooftop Mounting

Ground Level Mounting

Snow Belt Recommendations

Dimensional Data

Weights

Heat Pump Condenser

Installation

Refrigerant Piping Guidelines

Refrigerant Piping Procedures (Outdoor Units)

Refrigerant Piping Procedures (Indoor Unit)

Leak Check

System Evacuation

Insulating and Isolating Refrigerant Lines

Refrigerant Charging Procedure

Liquid Charging

Electrical Wiring

Unit Power Supply

Low Voltage Wiring

Field Wiring

Refrigerant Circuit

Electrical Data

Charging Charts and Superheat

Installation Checklist

Refrigerant Piping

Electrical Wiring

Pre-Start

Control Circuit Features

Discharge Temperature Limit (DTL)

Evaporator Defrost Control (EDC)

Low Pressure Cut-Out (LPCO)

High Pressure Cut-Out (HPCO)

Internal Overload Protector (IOL)

Start-Up

Terminology

Functions and Features

Test Modes

Step Test Mode

Resistance Test Mode

Auto Test Mode

Troubleshooting

Troubleshooting ReliaTel™ Controls

System Status Checkout Procedure

Method 1

Method 2

Resetting Cooling and Heating Lockouts

Method 1

Method 2

Zone Temperature Sensor (ZTS) Service Indicator

Temperature Tests

Test 1 - Zone Temperature Thermistor (ZTEMP)

Test 2 - Cooling Set Point (CSP) and Heating Set Point (HSP)

Test 3 - System Mode and Fan Selection

Test 4 - LED Indicator Test (SYS ON, HEAT, & COOL)

Programmable & Digital Zone Sensor Test

RLCI Loss of Communications

Testing Serial Communication Voltage

Maintenance

Monthly

Annually (Cooling Season)

Coil Cleaning

Maintenance Log

Wiring Diagram Matrix