Trane Symbio 700 Application User guide

Application Guide

Symbio™ 700 Controller

with Odyssey Split Systems

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.

June 2020

AACCCC--AAPPGG000011AA--EENN

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.

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//nnaattiioonnaall eelleeccttrriiccaall ccooddeess..

WWAARRNNIINNGG

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 PPPPEE rreeqquuiirreedd ffoorr
tthhee wwoorrkk bbeeiinngg uunnddeerrttaakkeenn ((EExxaammpplleess;; ccuutt rreessiissttaanntt gglloovveess//sslleeeevveess,, bbuuttyyll gglloovveess,,
ssaaffeettyy ggllaasssseess,, hhaarrdd hhaatt//bbuummpp ccaapp,, ffaallll pprrootteeccttiioonn,, eelleeccttrriiccaall PPPPEE aanndd aarrcc ffllaasshh
ccllootthhiinngg)).. AALLWWAAYYSS rreeffeerr ttoo aapppprroopprriiaattee SSaaffeettyy DDaattaa SShheeeettss ((SSDDSS)) aanndd OOSSHHAA
gguuiiddeelliinneess ffoorr pprrooppeerr PPPPEE..

•• WWhheenn wwoorrkkiinngg wwiitthh oorr aarroouunndd hhaazzaarrddoouuss cchheemmiiccaallss,, AALLWWAAYYSS rreeffeerr ttoo tthhee
aapppprroopprriiaattee SSDDSS aanndd OOSSHHAA//GGHHSS ((GGlloobbaall HHaarrmmoonniizzeedd SSyysstteemm ooff CCllaassssiiffiiccaattiioonn aanndd
LLaabbeelllliinngg ooff CChheemmiiccaallss)) gguuiiddeelliinneess ffoorr iinnffoorrmmaattiioonn oonn aalllloowwaabbllee ppeerrssoonnaall eexxppoossuurree
lleevveellss,, pprrooppeerr rreessppiirraattoorryy pprrootteeccttiioonn aanndd hhaannddlliinngg iinnssttrruuccttiioonnss..

•• IIff tthheerree iiss aa rriisskk ooff eenneerrggiizzeedd eelleeccttrriiccaall ccoonnttaacctt,, aarrcc,, oorr ffllaasshh,, tteecchhnniicciiaannss MMUUSSTT ppuutt
oonn aallll PPPPEE iinn aaccccoorrddaannccee wwiitthh OOSSHHAA,, NNFFPPAA 7700EE,, oorr ootthheerr ccoouunnttrryy--ssppeecciiffiicc
rreeqquuiirreemmeennttss ffoorr aarrcc ffllaasshh pprrootteeccttiioonn,, PPRRIIOORR ttoo sseerrvviicciinngg tthhee uunniitt.. NNEEVVEERR PPEERRFFOORRMM
AANNYY SSWWIITTCCHHIINNGG,, DDIISSCCOONNNNEECCTTIINNGG,, OORR VVOOLLTTAAGGEE TTEESSTTIINNGG WWIITTHHOOUUTT PPRROOPPEERR
EELLEECCTTRRIICCAALL PPPPEE AANNDD AARRCC FFLLAASSHH CCLLOOTTHHIINNGG.. EENNSSUURREE EELLEECCTTRRIICCAALL MMEETTEERRSS AANNDD
EEQQUUIIPPMMEENNTT AARREE PPRROOPPEERRLLYY RRAATTEEDD FFOORR IINNTTEENNDDEEDD VVOOLLTTAAGGEE..

©2020 Trane

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Copyright

Trademarks

IInnttrroodduuccttiioonn

WWAARRNNIINNGG

FFoollllooww EEHHSS PPoolliicciieess!!

FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..

•• AAllll TTrraannee ppeerrssoonnnneell mmuusstt ffoollllooww tthhee ccoommppaannyy’’ss EEnnvviirroonnmmeennttaall,, HHeeaalltthh aanndd SSaaffeettyy
((EEHHSS)) ppoolliicciieess wwhheenn ppeerrffoorrmmiinngg wwoorrkk ssuucchh aass hhoott wwoorrkk,, eelleeccttrriiccaall,, ffaallll pprrootteeccttiioonn,,
lloocckkoouutt//ttaaggoouutt,, rreeffrriiggeerraanntt hhaannddlliinngg,, eettcc.. WWhheerree llooccaall rreegguullaattiioonnss aarree mmoorree
ssttrriinnggeenntt tthhaann tthheessee ppoolliicciieess,, tthhoossee rreegguullaattiioonnss ssuuppeerrsseeddee tthheessee ppoolliicciieess..

•• NNoonn--TTrraannee ppeerrssoonnnneell sshhoouulldd aallwwaayyss ffoollllooww llooccaall rreegguullaattiioonnss..

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 written permission. 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.

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

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3

Table of Contents

Introduction . . . . . . . . .. . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . 7

Additional Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Symbio 700 Overview . . . . . . . . . . .. . . . . . . .. . . . . . . . .. . . . . . . .. . . . . . . . .. . . . . . . . . .. . 8

Field Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Onboard User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mobile Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Startup Sequence. . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . .. . . . . . . . .. 13

Conventional Thermostat Sequence of Operation . . .. . . . . . . . .. . . . . . . . .. . . . . . . 14

Space Temperature Control Sequence of Operation . . . . . . .. . . . . . . . .. . . . . . . . .. 16

Constant Volume and Multi-Speed Fan Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 16

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Supply Fan Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Single Zone Variable Air Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

General Support Sequences . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . .. . . . . . . .. . . . . . . 19

Fan Setpoints with VFD-driven Fan Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Compressor Minimum Runtime. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Refrigeration Circuit Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Compressor Proof of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Compressor Low Pressure Cutout Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Heat Pump Support Sequences . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . 21

Heat Pump Switchover Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Demand Defrost Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Evaporator Defrost Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Building Automation System Support Sequences . . . . . . . . . .. . . . . . . .. . . . . . . . . . 23

Occupancy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Timed Override. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Supply Air Tempering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Unit Stop. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Capacity Limit Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Remote Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Emergency and Ventilation Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Ventilation Override (Future) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Emergency Override. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Service Test Mode. . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . 27

Service Test Timeout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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Leaving Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Constant Volume Supply Fan Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Multi-Speed Supply Fan Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Variable Speed Supply Fan Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Diagnostics . .. . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . .. . . . 31

Device Tracker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Compressor Proving Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Diagnostic: Compressor X Proving Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Diagnostic: Compressor X Proving Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Diagnostic: Compressor X Contactor Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Diagnostics – Low Pressure Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Diagnostic: Circuit X LPC Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Diagnostic: Circuit X LPC Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Diagnostics – Alarm Indicator Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Reset Diagnostic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Power-Up Reset or Exception/Override Mode Transition. . . . . . . . . . . . . . . . . . . . 33

Reset Diagnostic Point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Heat Cool Mode Transition Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Reset Diagnostic Point – Active to Inactive Transition. . . . . . . . . . . . . . . . . . . . . . . 33

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

Unit Communication Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Sensor Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Compressor Fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

VFD Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Defrost Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Appendix A . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . 38

Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Multi-Speed/VFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Variable Speed/VFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Compressor Staging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Thermostat Staging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Cooling Only (Electric Heat) – CVZT & VVZT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Heat Pump – CVZT & VVZT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Condenser Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Thermostat, CVZT, & VVZT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Electric Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

CVZT & VVZT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Diagnostics and Alarm Indicator Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Emergency and Ventilation Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

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Internal and External Space Setpoint Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

6

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Introduction

The Symbio 700 installed on Odyssey split systems is a factory installed and programmed
controller, providing digital control and protection of the equipment.

The Symbio 700 has two model options:

• SSttaannddaarrdd CCoonnffiigguurraattiioonn — provides standard troubleshooting via on-board user interface
(UI) and access to the Symbio Service and Installation mobile app.

• AAddvvaanncceedd CCoonnffiigguurraattiioonn — introduces additional troubleshooting tools and Building
Automation System interface via BACnet® (ANSI/ASHRAE Standard 135-2016) or LonTalk™.

The Symbio 700 offers multiple equipment configuration options regardless of controller model.
The Odyssey split system can be configured as the following system types:

• Conventional Thermostat Control (T-Stat)

• Space Temperature Control Constant Volume (CVZT)

• Space Temperature Control Single Zone Variable Air Volume (VVZT)

These configurations can be used with standard cooling or heat pump systems.

This guide provides information about the configuration, control capabilities and
troubleshooting of the Odyssey system with Symbio 700 controller.

Additional Documentation

• Symbio Service and Installation Quick Start Guide - BAS-SVN043

• Symbio 700 User Guide - BAS-SVU054

• Symbio 700 BACnet Integration Guide - ACC-SVP001

• Symbio 700 LonTalk Integration Guide - ACC-SVP002

• Odyssey General Installation, Operation, and Maintenance Guide - SSA-SVX06

• Odyssey Cooling Installation, Operation, and Maintenance Guide -SS-SVX001

• Odyssey Heat Pump Installation, Operation, and Maintenance Guide - SSP-SVX001

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Symbio 700 Overview

Field Connection

The Symbio 700 controller optimizes inputs and outputs (I/O) for multiple applications. For initial
installation of an Odyssey with Symbio 700, the field landed inputs are outlined below.

Table 1. Field Connections

Connector Function Pin #

J16

J17

J18

J19 Zone Sensor Connections

J20

Demand Shed/Demand Limit

Connection

BACnet Communication

Connections

Equipment Shutdown Input

Connections

Occupancy Connections

Figure 1. Symbio 700 Field Connections

Signal

1 24VAC

2

1 BACnet +

2 BACnet -

3 BACnet +

4 BACnet -

1 24VAC

2

1

2 GND

3

4 Mode

5

6 GND

7 24VAC

1 24VAC

2

Demand Shed/Demand Limit

Input

Equipment Shutdown Input

Zone Temperature

Cool Setpoint

Heat Setpoint

Occupancy Switch

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Table 1. Field Connections (continued)

Connector Function Pin #

J21 Thermostat Connections

J22 CO

J23

2

Space Humidity

Unit Configuration

The Odyssey system can be configured via an onboard user interface or via the Symbio Service
and Installation mobile app.

Signal

1 24VAC

2 Y1

3

4 G

5 W2

6 Y2

7 X2

8 1.5K Ohms Pull-down

9 GND

1 24Vdc Out

2 CO

3 Common

1 24Vdc Out

2

3 Common

W1/O

In

2

Space Humidity

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Onboard User Interface

The onboard user interface provides a 2 x 16 Backlit LCD display and navigational buttons. This
allows the user to view status, configure, and troubleshoot the unit without additional tools.

Figure 2. Symbio 700 Onboard User Interface

The interface provides an intuitive menu structure: alarms, status, service, settings, and utilities.
Configuration of the unit is accomplished under the utilities menu item. A complete list of
functions is outlined in the Symbio 700 User Guide - BAS-SVU054.

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SSyymmbbiioo 770000 OOvveerrvviieeww

To configure the unit, navigate to the utilities menu and press “Enter”. Once in the utilities menu
the user has additional submenu options. This allows the user to navigate and configure the
appropriate setting quickly and easily.

Mobile Application

The Trane Symbio™ Service and Installation mobile app is required to setup, edit, and confirm
the communication protocol and associated settings.

The free download of Trane Symbio Service and Installation mobile app is available on the App
Store® for iOS, and on Google Play® for Android™.

Figure 3. Trane Symbio™ Service and Installation mobile app

Bluetooth Pairing

Quick Connection Instructions

Follow these instructions to quickly connect the mobile app to the Symbio 700 controller:

Connecting to the Symbio 700 controller

1. Enable BBlluueettooootthh on your smart device.

2. Press

3. Confirm the status of Bluetooth communications.

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on Symbio 700 keyboard/display to turn on Bluetooth.

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Blue LED

Off NOT CONNECTED Bluetooth Off

Press for On/Off

Blinking

On Solid CONNECTED

Figure 4. Symbio 700 Bluetooth status

Display Description

WAITING... Bluetooth On — Not Paired

Bluetooth On — Connected/

Paired

4. Start the mobile app on your smart device.

5. On the login screen, press SSkkiipp in the lower right-hand corner of the screen. Or Trane
personnel can login using their Trane Connect username and password.

6. On the Unit List page, select the Symbio 700 controller that you want to pair with. If the
controller is not listed, press the refresh arrow in the upper right-hand corner of the screen.

7. When prompted, pair the app to the Symbio 700 controller. A popup message displays a 6­digit random number. The same number is shown on the display of the Symbio 700
controller until the pairing is complete, allowing the user to confirm connection to the
intended controller.

Figure 5. Bluetooth pairing

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IImmppoorrttaanntt:: To keep the list of previously-connected devices manageable, the Bluetooth smart

The Symbio Installation and Service tool is required to view and configure the following:

• Building Automation System configuration (Advanced Controller Configuration)

– BACnet over Zigbee® (Air-Fi™ Wireless)

– BACnet IP (Internet Protocol)

– BACnet MS/TP

– LonTalk

• Historical Alarms

• Firmware Updates

• Backup & Restore

For more detailed information on the Symbio Service and Installation Mobile Application, refer to
the Quick Start Guide for Symbio Service and Installation - BAS-SVN043.

devices list is limited to 10 devices. When 10 or more Bluetooth devices are defined
on the smart device, connection to the Symbio 700 controller is not allowed.

• iiOOSS ddeevviicceess - delete any unused devices until there are less than 10 items.

• AAnnddrrooiidd ddeevviicceess - the devices list is automatically limited to 10 items.

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Startup Sequence

Under normal conditions, the Symbio 700 will startup over approximately 60 seconds once
power is applied to the system. During this process, the controller checks that a valid system
configuration is present and proceeds to normal control operation. After startup, the system will
begin to respond to operational requests.

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Conventional Thermostat Sequence of Operation

When the Odyssey system is configured to operate with a conventional thermostat, the controller
provides protection for the system (see General Support Sequence section) and continues to
provide insight to operating conditions. A conventional thermostat can be applied with constant
volume cooling only, heat pump, and single zone 2-speed fan configured systems. While not
recommended, a conventional thermostat can be applied to single zone variable volume
configured systems, but the system is limited to staged fan control instead of a fully variable
sequence.

When under conventional thermostat control, the equipment responds directly to operating
requests from the thermostat device. Each thermostat input corresponds to a specific unit
function, as described in the following tables. Equipment protection functions and compressor
minimum on/off timers remain in-control, even when under conventional thermostat control.

Table 2. Cooling only/electric heat systems

Inputs Outputs

Supply

X Y1 Y2

NA OPEN OPEN OPEN OPEN CLOSED ON Min None None

NA OPEN OPEN CLOSED OPEN X ON Max None

NA OPEN OPEN X CLOSED X ON Max None

NA CLOSED OPEN OPEN OPEN X ON Min

NA OPEN CLOSED OPEN OPEN X ON Min

NA CLOSED CLOSED OPEN OPEN X ON Max

NA X X X X X OFF 0 None None OFF

W1/O

W2 G

Fan On/

Off

Request

Supply

Fan Speed

Request

Compres-

sor Cool

Stage

Request

Stage 1

Stage 1

Full Stage

Auxiliary

Heat

Stage

Request

Stage 1

Full Stage

None Cool

None Cool

None Cool

Heat Cool

Mode

Status

Fan Only

Heat

Heat

X=ignored by controller

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Heat

Heat

Heat

Mode

Status

Stage

Stage

Em Heat

None Heat

Request

Full Stage

Stage 1

Request

Heat Cool

Heat

Auxiliary

sor Heat

Compres-

Heat

None Heat

None Heat

Stage 1 Full Stage

Stage 1

Full Stage

Full Stage

Stage 1 Full Stage

Full Stage Full Stage

None None Cool

Fan Only

None None Cool

None None Cool

Compres-

Supply

Supply

Inputs Outputs

sor Cool

Fan On/

Stage

Request

Request

Fan Speed

Stage 1

Stage 1

Full Stage

Off

Request

W2 G

W1/O

X Y1 Y2

Table 3. Heat pump systems

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OPEN OPEN OPEN CLOSED OPEN OPEN OFF 0 None None None Cool

OPEN CLOSED OPEN CLOSED OPEN X ON Min

OPEN X X OPEN CLOSED X ON Max None None

OPEN CLOSED CLOSED OPEN CLOSED X ON Max None

OPEN OPEN CLOSED OPEN CLOSED X ON Max None

OPEN CLOSED OPEN OPEN CLOSED X ON Max None

OPEN CLOSED CLOSED OPEN OPEN X ON Max None

OPEN OPEN CLOSED OPEN OPEN X ON Max None

OPEN CLOSED OPEN OPEN OPEN X ON Max None

CLOSED OPEN OPEN OPEN OPEN X ON Max None None

OPEN OPEN CLOSED CLOSED OPEN X ON Min

X X X X X X OFF 0 None None None OFF

OPEN CLOSED CLOSED CLOSED OPEN X ON Max

OPEN OPEN OPEN X OPEN CLOSED ON Min None None None

X=ignored by controller

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Space Temperature Control Sequence of Operation

Constant Volume and Multi-Speed Fan Configuration

Normal Operation

The Symbio 700 has a single-loop (space temperature only) control sequence. The sequence is
PI-based (proportional, integral) and strives to maintain space temperature within 1F of the active
cooling and heating setpoints.

• When Space Temperature Active > Space Temp Cooling Setpoint Status, the algorithm
calculates a need for cooling capacity to be energized.

• When Space Temperature Active < Space Temp Heating Setpoint Status, the algorithm
calculates a need for heating capacity to be energized.

• When Space Temp Heating Setpoint Status ≤ Space Temperature Active ≤ Space Temp
Cooling Setpoint Status:

– The algorithm calculates a reduction in need for any active cooling or heating capacity if

ON.

– If no cooling or heating capacity is active, cooling and heating capacity remains inactive.

Supply Fan Control

The supply fan is controlled “ON” 5 seconds before heating or cooling capacity is energized.
When heating or cooling capacity is de-energized, a supply fan off delay is applied based on
active capacity. For single-speed supply fan configured systems, the supply fan is controlled
“ON” during all cooling and heating sequences.

For multi-speed supply fan configured systems, the fan operates per the following:

• Low speed when the supply fan is ON without active capacity (unless ON due to an override
function)

• Low speed when the unit is operating at its minimum cooling stage

• High speed when the unit is operating at its maximum cooling stage or while any heating
stages are active.

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Figure 6. Multi-speed fan sequence of operation

Single Zone Variable Air Volume

When configured for VVZT (also known as SZVAV) control, the sequence is only applicable when
the following are true; otherwise, the CVZT sequence is leveraged:

• When Occupancy Status is Occupied and

• When Supply Fan Configuration Status is Continuous and

• When Discharge Air Temperature sensor is not in an Alarm state and

• The unit is operating under a cooling demand (VVZT heating is not applicable with staged
heat for Odyssey)

The sequence is PI-based (proportional, integral) and strives to maintain space temperature
within 1F of the Active Cooling and Heating setpoints.

When Space Temperature Active > Space Temp Cooling Setpoint status, the algorithm calculates
a need for cooling capacity to be energized. A discharge air temperature setpoint calculates
lower to determine proper compressor staging needs. The minimum value of this calculated
setpoint for temperature control can be adjusted by the Discharge Air Temperature Minimum
Cool Limit setpoint.

When Space Temperature Active < Space Temp Cooling Setpoint status, the algorithm calculates
a reduction in need for cooling capacity to be energized. A discharge air temperature setpoint
calculates higher to determine proper compressor staging needs. The maximum value of this
calculated setpoint for temperature control can be adjusted by the Discharge Air Temperature
Maximum Cool Limit setpoint.

Different from the CVZT sequence, compressors are staged to maintain the discharge air
temperature at the Discharge Air Temperature Setpoint Active setpoint.

VVZT DAT Control Mode

With the Symbio 700 VVZT control sequence, the end user can choose to use the internally
derived Discharge Air Temperature Setpoint Active or to override the value with their own.

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If the VVZT DAT Control Mode – Active point is set to "Auto", the VVZT control algorithm will use
the internally derived Discharge Air Temperature Setpoint Active, as described above, for all
cooling capacity output control.

If the VVZT DAT Control Mode – Active point is set to "Manual", the VVZT control algorithm will
use the Discharge Air Cooling Setpoint (Target) – Active as upper limit for the Discharge Air
Temperature Setpoint calculation. Typically this is set to a low value (i.e 50-55F) to drive longer
compressor runtimes. When this override is active, if the space temperature is 2° F below the
Space Temp Cooling Setpoint Status value or 1° F above the Space Temp Heating Setpoint
Status value, the controller will pause the override sequence until the space temperature
recovers to above the Space Temp Cooling Setpoint status.

Supply Fan Control

For the VVZT control sequence to be active, the Supply Fan Configuration Status must be ON/
Continuous.

The fan speed is continuously variable on VVZT systems. The fan remains at minimum speed
(based on active compressor stages) until the space demand requires additional airflow.

All heating is accomplished with the CVZT control sequence, and the fan is controlled at
maximum speed.

Figure 7. Supply fan sequence of operation

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General Support Sequences

Fan Setpoints with VFD-driven Fan Types

When a system is equipped with a VFD, the minimum and maximum VFD parameters can be
adjusted to tune the airflow to meet the application requirements.

In addition to this, the Symbio 700 supports setpoints that can adjust airflow as needed:

• Supply Fan Maximum Speed Setpoint

– Range: 67-100%

– Operation: This setpoint “trims” the maximum fan speed, based on the configured

maximum VFD speed

– Example: VFD Max = 60Hz

• Supply Fan Maximum Speed Setpoint @ 75% yields a maximum of 45Hz VFD output.

• Effective VFD Max (to be used in Supply Fan Minimum Speed Setpoint application)
will be set to 45Hz

• Supply Fan Minimum Speed Setpoint

– Range: 0-100%

– Operation: 0-100% over minimum to effective maximum VFD configured fan speed

– Example: VFD Min = 30Hz, Effective VFD Max = 60Hz

• Supply Fan Minimum Speed Setpoint @ 50% yields 45Hz VFD output.

• Minimum and Maximum Speed Setpoints interact to ensure that the minimum defined fan
speed at a given equipment operating condition is maintained.

Compressor Minimum Runtime

Under all normal running conditions, a 3–minute minimum ON and OFF timer is maintained for
each compressor. Once a compressor is turned ON, it remains on for a minimum of 3 minutes.
Once a compressor is turned OFF, it remains off for a minimum of 3 minutes. System overrides
that require immediate shutdown of the equipment, test modes, and compressor diagnostics/
protection functions can override these 3–minute timers. However for normal temperature and
thermostatic-based control, these minimum ON/OFF timers are maintained.

Refrigeration Circuit Management

There are two refrigeration configurations that the controller will use to determine proper
response to refrigeration system faults:

• When the unit is configured with a MMaanniiffoolldd refrigeration system, if any compressor
protection device or function trips for a given compressor, all compressors associated with
the circuit on which the protection device or functions trips will be commanded to OFF.

• When the unit is configured with an IInnddeeppeennddeenntt refrigeration system, if any compressor
protection device or function trips, for a given compressor, only the compressor associated
with the protection device or function that tripped will be commanded to OFF.

Compressor Proof of Operation

For each compressor. a Compressor Proving binary input is used to monitor the state of an
auxiliary switch that is used to indicate compressor motor contactor status. Under normal
operation, detected operation indicates that all safety devices within the compressor safety
circuit are in their normal state. The switch operates as OPEN when the compressor motor is OFF
and CLOSED when the compressor motor is ON.

Refer to the Diagnostics section below for specific diagnostics that are generated based on the
Compressor Proving signals.

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Compressor Low Pressure Cutout Control

For each compressor/circuit, a normally CLOSED low pressure cutout input is monitored for
equipment protection on the Symbio 700. When a low pressure event is active, the input
becomes OPEN and diagnostics are generated as described below. Refer to the Diagnostics
section below for specific diagnostics that are generated based on the circuit Low Pressure
Cutout inputs.

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Heat Pump Support Sequences

Heat Pump Switchover Valve

The Switchover Valve function is only applicable to Heat Pump units. Depending on the
refrigeration system configuration for a unit, it may have one or two switchover valves.
Additionally, some units with two switchover valves could control each valve independently
while others will control in tandem.

In normal unit operation, the Unit Mode will determine the operation of the switchover valve.
Unit Mode COOL will turn the switchover valve ON while Unit Mode HEAT will turn the
switchover valve OFF.

If the unit is in active Heat Pump Heating (switchover valve is OFF) and then enters defrost, the
switchover valve will be turned ON for the duration of defrost. When leaving active defrost, the
switchover valve transition to OFF is delayed 5 seconds.

Demand Defrost Control

There are two schemes in common usage for heat pump outdoor coil defrosting: Demand
Defrost and time temperature defrost. Demand Defrost is more efficient because defrost cycles
are initiated only when necessary, compared with initiation based on operating time below the
threshold temperature.

Outdoor coil defrosting occurs only when operating in heating mode with outdoor ambient
temperature below 52° F and the outdoor coil temperature below 33° F. The first defrost cycle
after power-up is initiated based on operating time at the required conditions. Shortly after
completion of the defrost cycle, the temperature difference between the outdoor coil and outdoor
air is calculated and is used as an indicator of unit performance at dry coil conditions.

Over time, as moisture and frost accumulate on the coil, the coil temperature will drop,
increasing the temperature difference. When the temperature difference reaches 1.8 times the
dry coil temperature differential (ΔT), a defrost cycle is initiated. While defrosting, the reversing
valve is in the cooling position, outdoor fans are off, and the compressors continue to operate.

The defrost cycle is terminated when the coil temperature rises high enough to indicate that the
frost has been eliminated. Termination of the defrost cycle includes a soft start delay. At the end
of each defrost cycle, the outdoor fan comes on 5 seconds before the reversing valve is de­energized. This reduces stress on the compressor and makes for a quieter defrost.

Figure 8. Typical Demand Defrost cycle

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During the defrost cycle, the Switchover Valve is turned ON, the Condenser Fan is turned OFF,
and auxiliary heat is turned ON regardless of their prior operating status while maintaining

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compressor operation. The defrost cycle is terminated based on the defrost termination
temperature calculation using the outdoor temperature (ODT) +47°F. The defrost termination
temperature (DTT) will be limited between 57° F and 72° F.

Evaporator Defrost Control

To prevent frost build-up on the indoor coil during low ambient conditions, compressor
operation is monitored and controlled accordingly, relative to outdoor air temperature.

Evaporator Defrost Control can be initiated through two means, based on configuration.

• If configured for Evaporator Defrost Control Enabled:

– When the unit is operating in a “Cool” mode with a valid Outdoor Air Temperature, the

EDC function will keep track of the amount of time that at least one compressor in the unit
is commanded ON and the Outdoor Air Temperature Active is less than the low ambient
temperature defined in table 3. If the Accumulated Compressor On Time reaches 10
minutes, the EDC function will cause the Compressor Output(s) to de-energize for three
minutes. The supply fan continues to operate during this three-minute interval at 100%
capacity. After the three-minute EDC timer has expired, the EDC function is ended and
compressors are allowed to operate as requested by the algorithm.

– Low Ambient Temperature Sepoints:

• Single Compressor Systems: 55° F

• Multi-Compressor Systems: 40° F

• If configured for FroStat Installed:

– A FroStat input can also be used to directly request the Evaporator Defrost Control

function

– When the unit is running in an effective “Cool” mode, the FroStat input will directly

control the FroStat diagnostic. If the FroStat input CLOSES, the diagnostic will be
annunciated.

– When the unit is running in an effective “Heat” mode, and the Refrigeration System ==

Heat Pump, the FroStat diagnostic will be controlled “Inactive” until the following are
true:

• FroStat input is CLOSED

• One or More Compressors have been active for Heat Pump Heating for more than 30
seconds.

Once the above two conditions are met, the FroStat Diagnostic will become Active.

– The FroStat diagnostic is an Auto-Reset diagnostic such that it will be reset when the

FroStat input is OPEN in either effecting unit mode.

– If the FroStat diagnostic becomes active, the Compressor Output(s) will de-energize until

the FroStat diagnostic is cleared. The supply fan continues to operate during the FroStat
diagnostic, so long as it is still requested by a heating or cooling function.

FroStat and Evaporator Defrost Control can both be configured on a unit, although in most cases,
only one should be necessary.

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Building Automation System Support Sequences

Occupancy Mode

During expected occupied periods, the system will control to the user selected cooling and
heating setpoints.

• The unoccupied setpoint temperatures are often adjusted higher for cooling (setup) and
lower for heating (setback) to reduce building operating cost.

• Regardless of how the (occupied) fan mode is set, the supply fan mode is forced to AUTO
during unoccupied periods to reduce supply fan operating costs.

There are two mechanisms available to control when units should switch between occupied and
unoccupied modes:

• Building controllers provide signals to the unit to request occupied or unoccupied operation.
Time-of-day scheduling within building controllers typically determine when the switching
should occur.

• Stand Alone Unoccupied control is initiated by a contact closure that causes the unit to begin
unoccupied control. In this mode, the controller will use the Unoccupied Cooling and Heating
setpoints to determine capacity control needs. Stand Alone Unoccupied control is only
applicable when the unit is not being controlled by a conventional thermostat interface.

Timed Override

Exceptions to the time-of-day scheduling are required when unusual or difficult to schedule
events cause a space to become occupied during a scheduled unoccupied period. The Timed
Override function provides a mechanism for an occupant to signal the system that the space is
actually occupied and override the time-of-day schedule to provide occupied control for some
limited time period. It also provides a mechanism to return the system to unoccupied mode
when the space is no longer occupied.

There are two methods of requesting or terminating timed override on a Symbio 700 control
system:

• BAS

– Timed Override Request value can be set to 3 discrete values:

• IIddllee