Trane ComfortLink II 4TWV8X24A1000A Assembly instructions

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
September 2021 1188--BBCC110066DD11--11CC--EENN
TRANE Link or ComfortLink™™ II
Variable Speed Heat Pumps and Air Conditioners
4TWV8X24A1000A
4TWV8X36A1000A
4TWV8X48A1000A
4TWV8X60A1000A
4TTV8X24A1000A
4TTV8X36A1000A
4TTV8X48A1000A
4TTV8X60A1000A
TM
The Diagnostics Mobile App is available by scanning a QR
code located inside this unit or by searching for the Link
Diagnostics App in your App Store
® .
NNoottee:: Graphics in this document are for representation only. Actual
model may differ in appearance.”
NNoottee:: This unit can be used in Comfortlink
™ II ( clii”) mode or Link
mode.
Installer’s Guide

©2021 Trane 18-BC106D1-1C-EN
SAFET SECTION
IImmppoorrttaanntt — This document contains a wiring diagram
and service information This is customer property and
is to remain with this unit Please return to service
information pack upon completion of work
WWAARRNNIINNGG
HHAAZZAARRDDOOUUSS VVOOLLTTAAGGEE!!
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pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
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ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg FFoollllooww pprrooppeerr
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ccaannnnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd
WWAARRNNIINNGG
RREEFFRRIIGGEERRAANNTT OOIILL!!
AAnnyy aatttteemmpptt ttoo rreeppaaiirr aa cceennttrraall aaiirr ccoonnddiittiioonniinngg
pprroodduucctt mmaayy rreessuulltt iinn pprrooppeerrttyy ddaammaaggee,, sseevveerree
ppeerrssoonnaall iinnjjuurryy,, oorr ddeeaatthh
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aatt 5500 ttoo 7700%% hhiigghheerr pprreessssuurreess tthhaann RR--2222 UUssee oonnllyy
RR--441100AA aapppprroovveedd sseerrvviiccee eeqquuiippmmeenntt RReeffrriiggeerraanntt
ccyylliinnddeerrss aarree ppaaiinntteedd aa ““RRoossee”” ccoolloorr ttoo iinnddiiccaattee
tthhee ttyyppee ooff rreeffrriiggeerraanntt aanndd mmaayy ccoonnttaaiinn aa ““ddiipp””
ttuubbee ttoo aallllooww ffoorr cchhaarrggiinngg ooff lliiqquuiidd rreeffrriiggeerraanntt iinnttoo
tthhee ssyysstteemm AAllll RR--441100AA ssyysstteemmss wwiitthh vvaarriiaabbllee
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aabbssoorrbbss mmooiissttuurree ffrroomm tthhee aattmmoosspphheerree TToo lliimmiitt
tthhiiss ““hhyyggrroossccooppiicc”” aaccttiioonn,, tthhee ssyysstteemm sshhoouulldd
rreemmaaiinn sseeaalleedd wwhheenneevveerr ppoossssiibbllee IIff aa ssyysstteemm hhaass
bbeeeenn ooppeenn ttoo tthhee aattmmoosspphheerree ffoorr mmoorree tthhaann 44
hhoouurrss,, tthhee ccoommpprreessssoorr ooiill mmuusstt bbee rreeppllaacceedd NNeevveerr
bbrreeaakk aa vvaaccuuuumm wwiitthh aaiirr aanndd aallwwaayyss cchhaannggee tthhee
ddrriieerrss wwhheenn ooppeenniinngg tthhee ssyysstteemm ffoorr ccoommppoonneenntt
rreeppllaacceemmeenntt
CCAAUUTTIIOONN
HHOOTT SSUURRFFAACCEE!!
MMaayy ccaauussee mmiinnoorr ttoo sseevveerree bbuurrnniinngg FFaaiilluurree ttoo
ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn pprrooppeerrttyy
ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
DDoo nnoott ttoouucchh ttoopp ooff ccoommpprreessssoorr
CCAAUUTTIIOONN
CCOONNTTAAIINNSS RREEFFRRIIGGEERRAANNTT!!
FFaaiilluurree ttoo ffoollllooww pprrooppeerr pprroocceedduurreess ccaann rreessuulltt iinn
ppeerrssoonnaall iillllnneessss oorr iinnjjuurryy oorr sseevveerree eeqquuiippmmeenntt
ddaammaaggee
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pprreessssuurree RReeccoovveerr rreeffrriiggeerraanntt ttoo rreelliieevvee pprreessssuurree
bbeeffoorree ooppeenniinngg ssyysstteemm
CCAAUUTTIIOONN
GGRROOUUNNDDIINNGG RREEQQUUIIRREEDD!!
FFaaiilluurree ttoo iinnssppeecctt oorr uussee pprrooppeerr sseerrvviiccee ttoooollss mmaayy
rreessuulltt iinn eeqquuiippmmeenntt ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
RReeccoonnnneecctt aallll ggrroouunnddiinngg ddeevviicceess AAllll ppaarrttss ooff tthhiiss
pprroodduucctt tthhaatt aarree ccaappaabbllee ooff ccoonndduuccttiinngg eelleeccttrriiccaall
ccuurrrreenntt aarree ggrroouunnddeedd IIff ggrroouunnddiinngg wwiirreess,, ssccrreewwss,,
ssttrraappss,, cclliippss,, nnuuttss,, oorr wwaasshheerrss uusseedd ttoo ccoommpplleettee aa
ppaatthh ttoo ggrroouunndd aarree rreemmoovveedd ffoorr sseerrvviiccee,, tthheeyy mmuusstt
bbee rreettuurrnneedd ttoo tthheeiirr oorriiggiinnaall ppoossiittiioonn aanndd pprrooppeerrllyy
ffaasstteenneedd
WWAARRNNIINNGG
SSEERRVVIICCEE VVAALLVVEESS!!
FFaaiilluurree ttoo ffoollllooww tthhiiss wwaarrnniinngg wwiillll rreessuulltt iinn aabbrruupptt
rreelleeaassee ooff ssyysstteemm cchhaarrggee aanndd mmaayy rreessuulltt iinn
ppeerrssoonnaall iinnjjuurryy aanndd//oorr pprrooppeerrttyy ddaammaaggee
EExxttrreemmee ccaauuttiioonn sshhoouulldd bbee eexxeerrcciisseedd wwhheenn
ooppeenniinngg tthhee SSuuccttiioonn aanndd LLiiqquuiidd LLiinnee SSeerrvviiccee VVaallvvee
TTuurrnn vvaallvvee sstteemm ccoouunntteerrcclloocckkwwiissee oonnllyy uunnttiill tthhee
sstteemm ccoonnttaaccttss tthhee rroolllleedd eeddggee NNoo ttoorrqquuee iiss
rreeqquuiirreedd
WWAARRNNIINNGG
BBRRAAZZIINNGG RREEQQUUIIRREEDD —— IIFF UUSSIINNGG
MMEECCHHAANNIICCAALL CCOONNNNEECCTTIIOONNSS,,
EENNSSUURREE LLEEAAKK TTEESSTT IISS NNEEGGAATTIIVVEE!!
FFaaiilluurree ttoo iinnssppeecctt lliinneess oorr uussee pprrooppeerr sseerrvviiccee ttoooollss
mmaayy rreessuulltt iinn eeqquuiippmmeenntt ddaammaaggee oorr ppeerrssoonnaall
iinnjjuurryy
IIff uussiinngg eexxiissttiinngg rreeffrriiggeerraanntt lliinneess mmaakkee cceerrttaaiinn tthhaatt
aallll jjooiinnttss aarree bbrraazzeedd,, nnoott ssoollddeerreedd
WWAARRNNIINNGG
HHIIGGHH LLEEAAKKAAGGEE CCUURRRREENNTT!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
EEaarrtthh ccoonnnneeccttiioonn eesssseennttiiaall bbeeffoorree ccoonnnneeccttiinngg
eelleeccttrriiccaall ssuuppppllyy

18-BC106D1-1C-EN 3
+VDC -VDC
ELECTRICAL HAZARD
Failure to follow this warning
could result in personal
injury or death.
WAIT TWO (2) MINUTES
after disconnecting power
prior to touching electrical
components as they may
hold a dangerous charge of
400VDC, then verify DC
Voltage is less than 42 VDC at
inverter test points labeled
+VDC and -VDC before
servicing board.
400 VOLTS
WARNING
+VDC and
-VDC
Approved Combinations for Variable Speed Units running in
Link mode
• UX360 Smart Thermostat
• SC360 System Controller
• Approved System Accessories
• TAMX
• S8V2xxxxxxVC
Approved Combinations for Variable Speed Units running in
clii mode
• TCONT850, TZONE950, or TZON1050
• TAM9
• TAM8C
• TAM8
• S9V2 Furnace w/Relay Panel
• XC80 Furnace
• XC95m Furnace
• Approved System Accessories
Note: See AHRI directory for approved indoor and outdoor model
combinations. Only Trane / American Standard coils and air
handlers are approved for use with variable speed outdoor unit.
Important: Use caution when cleaning outdoor coil to ensure no
water enters the electrical control compartment. When
cleaning coil from inside the compressor compartment,
take special care not to spray water towards the top rows
of the coil near the control panel. Water may enter the
control compartment and drive damaging the
electronics. Disconnect all electric power, including
remote disconnects before servicing.
Table 1. Operating Range
Cooling 55° F to 120° F
Heating -10° F to 66° F
SSAAFFEETTYY SSEECCTTIIOONN

418-BC106D1-1C-EN
Unit Location Considerations 5
6
Coastal Considerations 7
Unit Preparation 8
Setting Up the Unit 8
Refrigerant Line Considerations 9
Refrigerant Line Brazing 12
Refrigerant Line Leak Check 14
Refrigerant Line and Indoor Coil
Evacuation 14
Service Valves 15
Electrical – Low Voltage
Communicating 16
Electrical — High Voltage 19
Integrated Variable Speed Control Board LED
Indicators 20
Start Up 21
System Charge Adjustment 22
Subcool Charging Correction
Charts 23
Refrigerant Charging Chart 24
Charging the Unit 25
Subcooling Charging Below 55º F
Outdoor Temp (In Heating Only) 26
Communicating Display Assembly
(CANda) 27
Defrost Control (Heat Pump only) 28
Checkout Procedures 29
Table of Contents

18-BC106D1-1C-EN 5
Unit Location Considerations
Table 2. Unit Dimensions and Weight
Models H x D x W (in) Weight * (lb)
D
H
W
4TWV8X24A 41 x 30 x 33 195
4TWV8X36A 41 x 30 x 33 208
4TWV8X48A 41 x 34 x 37 234
4TWV8X60A 45 x 34 x 37 250
4TTV8X24A 41 x 30 x 33 196
4TTV8X36A 41 x 30 x 33 207
4TTV8X48A 41 x 34 x 37 245
4TTV8X60A 45 x 34 x 37 250
* Weight values are estimated (uncrated).
• When mounting the outdoor unit on a roof, be sure the roof will support
the unit’s weight.
• Properly selected isolation is recommended to alleviate sound or
vibration transmission to the building structure.
Table 3. Refrigerant Line and Service Valve Connection Sizes
Model
Rated Line Sizes Service Valve
Connection Sizes
50’
Max
Line
Lift
Standard
Line Set
150’ Max
Line Length
50
Max
Line
Lift
100’ Max
Line
Length
100’ Max
Line
Length
Refer to (a), (b), and (c) footnotes for
specific model details
Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
4TWV8X24A 5/8 (a) 3/8 3/4 3/8
4TWV8X36A 3/4 (a) 3/8 3/4 3/8
4TWV8X48A 7/8 (a) 3/8 7/8 3/8
4TWV8X60A 7/8 (a) 3/8 7/8 3/8
4TTV8X24A 5/8 (a) 3/8 3/4 3/8
4TTV8X36A 3/4 (a) 3/8 3/4 3/8
4TTV8X48A 7/8 (a) 3/8 7/8 3/8
4TTV8X60A 1–1/8 (b) 3/8 7/8 3/8
(a) The max length of refrigerant lines from outdoor to indoor unit MUST NOT exceed 150 feet. The max vertical change MUST NOT exceed 50 feet.
(b) The max length of refrigerant lines from outdoor to indoor unit MUST NOT exceed 80 feet. The max vertical change MUST NOT exceed 25 feet.

618-BC106D1-1C-EN
Table 4. Alternate Refrigerant Line and Service Valve Connection Sizes
Model
Alternate Line Sizes Service Valve
Connection Sizes
Vapor
Line Liquid Line Vapor Line Connection Liquid Line Connection
4TWV8X24A 3/4" (a) 5/16" 3/4" 3/8"
4TWV8X36A 5/8" (a) 5/16" 3/4" 3/8"
4TWV8X48A 3/4" (a) 3/8" 7/8" 3/8"
4TWV8X60A
3/4" (a) 3/8" 7/8" 3/8"
7/8" (a) 3/8" 7/8" 3/8"
Model
Alternate Line Sizes Service Valve
Connection Sizes
Vapor
Line Liquid Line Vapor Line Connection Liquid Line Connection
4TTV8X24A 3/4" (a) 5/16" 3/4" 3/8"
4TTV8X36A 3/4" (a) 5/16" 3/4" 3/8"
4TTV8X48A 3/4" (a) 3/8" 7/8" 3/8"
4TTV8X60A
3/4" (a) 3/8" 7/8" 3/8"
7/8" (a) 3/8" 7/8" 3/8"
(a) The max length of refrigerant lines from outdoor to indoor unit MUST NOT exceed 150 feet. The max vertical change MUST NOT exceed 50 feet.
Table 5. Suggested Locations for Best Reliability
• Ensure the top discharge area is unrestricted for at least 5
feet above the unit.
• Provide at least 3 feet clearance in front of the control box
(access panels) and any other side requiring service.
• Do not locate close to bedrooms as operational sounds may
be objectionable.
• Avoid locations near windows and similar areas where
condensation and freezing defrost vapor can annoy a
customer.
• Position the outdoor unit a minimum of 12” from any wall or
surrounding shrubbery to ensure adequate airflow.
• Outdoor unit location must be far enough away from any
structure to prevent excess roof runoff water or icicles from
falling directly on the unit.
• Position the outdoor unit a minimum of 12” from any wall or
surrounding shrubbery to ensure adequate airflow.
• Outdoor unit location must be far enough away from any
structure to prevent excess roof runoff water or icicles from
falling directly on the unit.
Min. 12” to
Shrubbery
Avoid Install
Near Bedrooms
Min 5’ Unrestricted
Access Panel
Min 3’
Unrestricted
Min. 12” to
Shrubbery Min. 12”
to Wall
UUnniitt LLooccaattiioonn CCoonnssiiddeerraattiioonnss

18-BC106D1-1C-EN 7
Table 6. Cold Climate Considerations (Heat Pump Only)
Note: It is recommended that these precautions be taken for
units being installed in areas where snow accumulation and
prolonged below-freezing temperatures occur.
• Units should be elevated 3–12 inches above the pad or
rooftop, depending on local weather. This additional height
will allow drainage of snow and ice melted during defrost cycle
prior to its refreezing. Ensure that drain holes in unit base pan
are not obstructed, preventing drainage of defrost water.
• If possible, avoid locations that are likely to accumulate snow
drifts. If not possible, a snow drift barrier should be installed
around the unit to prevent a build-up of snow on the sides of
the unit.
Min. 12”
Snow
Barrier
3-12” Elevation
Snow Legs
Pad
Coastal Considerations
If installed within one mile of salt water, including seacoasts and inland waterways, models without factory supplied Seacoast Salt Shields
require the addition of BAYSEAC001 (Seacoast Kit) at installation time.
UUnniitt LLooccaattiioonn CCoonnssiiddeerraattiioonnss

818-BC106D1-1C-EN
Unit Preparation
1 Check for damage and report promptly to the carrier
any damage found to the unit
2 To remove the unit from the pallet, remove tabs by
cutting with a sharp tool
Setting Up the Unit
Table 7. Pad Installation
When installing the unit on a support pad, such as a concrete slab,
consider the following:
• The pad should be at least 1” larger than the unit on all sides.
• The pad must be separate from any structure.
• The pad must be level.
• The pad should be high enough above grade to allow for drainage.
• The pad location must comply with National, State, and Local
codes.

18-BC106D1-1C-EN 9
Refrigerant Line Considerations
Table 8. Factory Charge
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit, ten (10) feet of tested
connecting line, and the smallest rated indoor evaporative coil match. Always verify proper system charge via subcooling (TXV/EEV).
Table 9. Required Refrigerant Line Length
Determine required line length and lift. You will need this to determine
the subcooling charging corrections later in the installation process.
Total Line Length = ___________________________Ft.
Total Vertical Change (lift) = ____________________Ft.
Line Length
Table 10. Refrigerant Line Insulation
Important: The Vapor Line must always be insulated. DO NOT allow
the Liquid Line and Vapor Line to come in direct (metal to
metal) contact.
Note: The gas line must always be insulated. Insulating the liquid line
through attic spaces may benefit system performance by
minimizing heat gain in the liquid line.
Liquid Line Vapor Line
Insulation

10 18-BC106D1-1C-EN
Table 11. Reuse Existing Refrigerant Lines
CCAAUUTTIIOONN
RREEFFRRIIGGEERRAANNTT!!
FFaaiilluurree ttoo iinnssppeecctt oorr uussee pprrooppeerr sseerrvviiccee ttoooollss mmaayy
rreessuulltt iinn eeqquuiippmmeenntt ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
IIff uussiinngg eexxiissttiinngg rreeffrriiggeerraanntt lliinneess mmaakkee cceerrttaaiinn tthhaatt
aallll jjooiinnttss aarree bbrraazzeedd,, nnoott ssoollddeerreedd
For retrofit applications, where the existing indoor evaporator coil
and/or refrigerant lines will be used, the following precautions should
be taken.
• Ensure that the indoor evaporator coil and refrigerant lines are
the correct size.
• Ensure that the refrigerant lines are free of leaks, acid, and oil.
Important: For more information, see publication number SS-
APG006–EN
Table 12. Refrigerant Line Routing Precautions
Important: Comply with National, State, and Local Codes when isolating line sets from joists, rafters, walls, or other structural elements.
Important: For buried linesets, see publication number SS-APG006–EN.
Important: Take precautions to prevent noise within the building structure due to vibration transmission from the refrigerant lines.
For Example:
• When the refrigerant lines must be fastened to floor joists or other framing in a structure, use isolation type hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all duct work.
• Minimize the number of 90° turns.
Table 13. Isolation From Joist/Rafter
8 Feet Maximum
Side View
8 Feet Maximum
Joist/Rafter
Isolator
Line Set
Secure Vapor Line from joists using isolators every 8 ft. Secure Liquid Line directly to insulated Vapor Line using tape, wire, or other appropriate
method every 8 ft.
RReeffrriiggeerraanntt LLiinnee CCoonnssiiddeerraattiioonnss

18-BC106D1-1C-EN 11
Table 14. Isolation In Wall Spaces
Side View
Isolator
Line Set
8 Feet Maximum
Wall
8 Feet Maximum
Secure Vapor Line from joists using isolators every 8 ft. Secure Liquid Line directly to insulated Vapor Line using tape, wire, or other appropriate
method every 8 ft.
Table 15. Isolation Through Wall
Wall
Sealant
Insulation
Vapor Line
Duct Work
Isolator
Line Set
DO NOT hang line sets from duct work
RReeffrriiggeerraanntt LLiinnee CCoonnssiiddeerraattiioonnss

12 18-BC106D1-1C-EN
Refrigerant Line Brazing
Table 16. Braze the Refrigerant Lines
1. Remove caps or plugs. Use a deburring tool to debur the pipe
ends. Clean both internal and external surfaces of the tubing
using an emery cloth.
2. Remove the pressure tap cap and valve core from each service
valves.
3. Purge the refrigerant lines and indoor coil with dry nitrogen.

18-BC106D1-1C-EN 13
Table 16. Braze the Refrigerant Lines (continued)
4. Wrap a wet rag around the valve body to avoid heat damage and
continue the dry nitrogen purge.
5. Braze the refrigerant lines to the service valves.
a. For Units shipped with a field-installed external drier, check
liquid line filter drier’s directional flow arrow to confirm
correct direction of refrigeration flow (away from outdoor unit
and toward evaporator coil) as illustrated. Braze the filter
drier to the Liquid Line.
6. Continue the dry nitrogen purge. Do not remove the wet rag until
all brazing is completed.
Important: Remove the wet rag before stopping the dry nitrogen
purge.
Note: Precautions should be taken to avoid heat damage to base pan
during brazing. It is recommended to keep the flame directly
off of the base pan.
3-4” from valve
7. Replace the pressure tap valve cores after the service valves have
cooled.
RReeffrriiggeerraanntt LLiinnee BBrraazziinngg

14 18-BC106D1-1C-EN
Refrigerant Line Leak Check
Table 17. Check for Leaks
1. Pressurize the refrigerant lines and evaporator coil to 150 PSIG
using dry nitrogen.
150 PSIG
2. Check for leaks by using a soapy solution at each brazed location.
Note: Remove nitrogen pressure and repair any leaks before
continuing.
Refrigerant Line and Indoor Coil Evacuation
IImmppoorrttaanntt:: Do not open the service valves until the
refrigerant lines and indoor coil leak check
and evacuation are complete.
1 Evacuate until the micron gauge reads no higher than
350 microns, then close off the valve to the vacuum
pump
0350
Microns
ON OFF
2 Observe the micron gauge Evacuation is complete if
the micron gauge does not rise above 500 microns in
one (1) minute
3 When evacuation is complete, blank off the vacuum
pump and micron gauge, and close the valves on the
manifold gauge set
1 MIN.

18-BC106D1-1C-EN 15
Service Valves
Table 18. Open the Gas Service Valve
Important: Leak check and evacuation must be completed before
opening the service valves.
Note: Do not vent refrigerant gases into the atmosphere.
1. Remove valve stem cap.
2. Using a wrench, turn valve stem 1/4 turn counterclockwise to
the fully open position.
3. Replace the valve stem cap to prevent leaks. Tighten finger
tight plus an additional 1/4 turn.
Cap 1/4 Turn Only
Counterclockwise
for Full Open Position
Valve Stem
Unit Side
of Valve
Pressure Tap Port
Gas Line Connection
Table 19. Open the Liquid Service Valve
WWAARRNNIINNGG
SSEERRVVIICCEE VVAALLVVEESS!!
FFaaiilluurree ttoo ffoollllooww tthhiiss wwaarrnniinngg wwiillll rreessuulltt iinn aabbrruupptt
rreelleeaassee ooff ssyysstteemm cchhaarrggee aanndd mmaayy rreessuulltt iinn
ppeerrssoonnaall iinnjjuurryy aanndd//oorr pprrooppeerrttyy ddaammaaggee
EExxttrreemmee ccaauuttiioonn sshhoouulldd bbee eexxeerrcciisseedd wwhheenn
ooppeenniinngg tthhee SSuuccttiioonn aanndd LLiiqquuiidd LLiinnee SSeerrvviiccee
VVaallvvee TTuurrnn vvaallvvee sstteemm ccoouunntteerrcclloocckkwwiissee oonnllyy
uunnttiill tthhee sstteemm ccoonnttaaccttss tthhee rroolllleedd eeddggee NNoo ttoorrqquuee
iiss rreeqquuiirreedd
Important: Leak check and evacuation must be completed before
opening the service valves.
4. Remove service valve cap.
5. Fully insert 3/16” hex wrench into the stem and back out
counterclockwise until valve stem just touches the rolled edge
(approximately five (5) turns).
6. Replace the valve cap to prevent leaks. Tighten finger tight
plus an additional 1/4 turn.
Cap
3/16” Hex Wrench
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
Service Port
Unit Side
of Service
Valve

16 18-BC106D1-1C-EN
Electrical – Low Voltage Communicating
Table 20. Low Voltage Maximum Wire Length
Table 20, p. 16 defines the size and combined total maximum length of
low voltage wiring from the outdoor unit, to the indoor unit, and to the
thermostat.
Note: The use of color coded low voltage wire is recommended to
simplify connections between the outdoor unit, the control, and
the indoor unit.
Note: The maximum total cable length for the entire comfort control
communicating system is 500 ft. 18 AWG.
CONTROL WIRING
WIRE SIZE MAX. WIRE LENGTH
18 AWG 500 Ft. Combined
Table 21. Low Voltage Hook-up Diagrams in Link mode
Figure 1. Fully Communicating System
Neatly bundle all low
voltage wires as shown.
White
Green Blue
Red
Communicating Outdoor Unit
Only used
for Load Shed and
Link Smart ChargeTM
(Cap off if not used)
The Brown data wire used in clii mode is NOT
used in Link mode (Cap off if not used)
R
DH
DL
B
R
DH
DL
B
R
DH
DL
B
R
DH
DL
B
UX360
Smart Thermostat
SC360
System Controller
Distribution
Board
Indoor
Unit
1. In communicating mode, unused terminals are non-functional. Do not use.
2. Terminals present will vary by indoor model.
3. “D” is the data line. Installer to select a wire color.
Note: Anti-oxidizing grease is supplied in the documentation package for use when making low voltage field wiring connections at the outdoor
unit. Apply grease to field wiring before installing wire caps to protect these connections from corrosion.

18-BC106D1-1C-EN 17
Table 22. Low Voltage Hook-up Diagrams in clii mode
Figure 2. Fully Communicating System
Neatly bundle all low voltage
wires as shown.
(Not used in clii mode)
DH
DL
Communicating
Comfort Control
W1
W2
W3
G
Y2
B
O
BK
D
Y1
R
Field wiring
Brown
Blue
Brown
Blue
Red
B - Blue
D - Note 3
D
R
B
Note 1
&
Note 2
Red
Only used for
Load Shed
(Cap off if
not used)
Communicating
Indoor Unit
Note 4
Note 5
Communicating Outdoor Unit
1. In communicating mode, unused terminals are non-functional. Do not use.
2. Terminals present will vary by indoor model.
3. “D” is the data line. Installer to select a wire color.
4. If a 3rd party condensate overflow switch is installed, it should be wired in series with R to the thermostat or connected to the External
Switch terminals on the AFC. See External Switch wiring section in the air handler Installer’s Guide.
5. Wire present only on Variable Speed Outdoor Units.
Note: Anti-oxidizing grease is supplied in the documentation package for use when making low voltage field wiring connections at the outdoor
unit. Apply grease to field wiring before installing wire caps to protect these connections from corrosion.
EElleeccttrriiccaall –– LLooww VVoollttaaggee CCoommmmuunniiccaattiinngg

18 18-BC106D1-1C-EN
Table 23. Link Low Voltage Wire Connectors
Link mode uses simple connectors for low voltage connections. These
connections are color coded which makes the installation easier and
quicker.
Link Wire Colors
R Red
DH White
DL Green
B Blue
Do the following to make the connections from the actual thermostat
wire to the connector.
Note: These connectors are necessary for the Outdoor unit, Indoor
unit and Distribution board.
1. Strip the Red, White, Green and Blue thermostat wires back 1/4”.
2. Insert the wires into the connector in the correctly colored
locations.
3. When you feel it release, allow each wire to slide in
further.
4. Pull back on the wires individually and slightly and check if the
wires are seated properly. If each wire does not pull out for all four
wires, the connection is complete.
5. Connectors are ONE TIME USE. If a 18 ga. Thermostat wire gets
broken off inside of the connector, the connector will need
replaced.
6. Wire colors are for illustration purposes only. If using a different
color, ensure it lands at the correct terminal throughout all of the
communicating control wiring.
Connect the CAN connector into the male coupling on the low voltage
harness at the Outdoor unit.
This air handler has two dedicated CAN Connector headers on the Air
Handler Control (AHC) board. In Link communicating mode, both of
them are in the communicating loop. It does not matter which one
goes to the thermostat, System Controller, distribution board, outdoor
unit or any other Link accessory.
R DH DL B
CAN Connector
Strip the control
wire back- 1/4”
Note: For use with 18 ga. solid core thermostat wire.
NNoottee:: This connector should be removed when using
this unit in clii mode.
EElleeccttrriiccaall –– LLooww VVoollttaaggee CCoommmmuunniiccaattiinngg

18-BC106D1-1C-EN 19
Electrical — High Voltage
Table 24. High Voltage Power Supply
WWAARRNNIINNGG
LLIIVVEE EELLEECCTTRRIICCAALL CCOOMMPPOONNEENNTTSS!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr ddeeaatthh
FFoollllooww aallll eelleeccttrriiccaall ssaaffeettyy pprreeccaauuttiioonnss wwhheenn
eexxppoosseedd ttoo lliivvee eelleeccttrriiccaall ccoommppoonneennttss IItt mmaayy bbee
nneecceessssaarryy ttoo wwoorrkk wwiitthh lliivvee eelleeccttrriiccaall ccoommppoonneennttss
dduurriinngg iinnssttaallllaattiioonn,, tteessttiinngg,, sseerrvviicciinngg,, aanndd
ttrroouubblleesshhoooottiinngg ooff tthhiiss pprroodduucctt
The high voltage power supply must agree with the equipment
nameplate.
Power wiring must comply with national, state, and local codes.
Follow instructions on unit wiring diagram located on the inside of the
control box cover and in the Service Facts document included with the
unit.
Table 25. High Voltage Disconnect Switch
WWAARRNNIINNGG
HHIIGGHH LLEEAAKKAAGGEE CCUURRRREENNTT!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr ddeeaatthh
EEaarrtthh ccoonnnneeccttiioonn eesssseennttiiaall bbeeffoorree ccoonnnneeccttiinngg
eelleeccttrriiccaall ssuuppppllyy
Install a separate disconnect switch at the outdoor unit.
For high voltage connections, flexible electrical conduit is
recommended whenever vibration transmission may create a noise
problem within the structure.
Table 26. High Voltage Disconnect Switch
Do NOT connect the Variable Speed Outdoor units line voltage to a GFCI protected circuit.
Ground the outdoor unit per national, state, and local code
requirements.

20 18-BC106D1-1C-EN
Integrated Variable Speed Control Board
LED Indicators
FAN
ALUMINUM COVER PLATE
LSOV
EEV
LOAD
MONITOR
TOOL
SHED
CDA
EXT.ODT
PERSONALITY MODULE STATUS
COMM
T4 T3
T1 T2
HPCO
DATA
CHARGE
SOLENOID
(N/A Phase I)
10
1
18
9J1
J6 J4
DRB
J8
J9
J3
J10
J2
J5
J20
PSC
(not used)
PWM
STATUS
COMM
High
Voltage
to Condensor
Fan Motor
The Status (Green) and
COMM (Amber) LEDs are
located in the upper right
region of the Control Board.
Fault messages are
displayed on the CANda
Table 27. LED’S in clii mode
LED RATE DESCRIPTION INDICATION
STATUS
(GREEN)
SLOW 1 TIME PER SECOND STANDBY/IDLE
MEDIUM 2 TIMES PER SECOND CALL FOR CAPACITY
FAST 5 TIMES PER SECOND POWER UP DELAY
SOLID ON TEST MODE
INTERMITTENT 1 FLASH EVERY 4 SECONDS HARD LOCKOUT
Note: The STATUS Light is not illuminated in Link mode.
Table 28. LED’S in clii and Link modes
LED RATE DESCRIPTION INDICATION
COMM
(AMBER)
SLOW 1 TIME PER DEVICE DEVICE COUNT
FAST 5 TIME PER SECOND LOSS OF COMMUNICATION