American Standard 4TCA4024C1000A 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
March 2022 8888--44TTCCAA44000022--11AA--EENN
Packaged Air Conditioner
4TCA4024C1000A
4TCA4030C1000A
4TCA4036C1000A
4TCA4042C1000A
4TCA4048C1000A
4TCA4060C1000A
NNoottee:: “Graphics in this document are for representation only. Actual
model may differ in appearance.”
Installer’s Guide

©2022 88-4TCA4002-1A-EN
SAFETY SECTION
IImmppoorrttaanntt — This document contains a wiring
diagram, a parts list, 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!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee
ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg FFoollllooww pprrooppeerr
lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaannnnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd
WWAARRNNIINNGG
SSAAFFEETTYY AANNDD EELLEECCTTRRIICCAALL HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
TThheessee sseerrvviicciinngg iinnssttrruuccttiioonnss aarree ffoorr uussee bbyy
qquuaalliiffiieedd ppeerrssoonnnneell oonnllyy TToo rreedduuccee tthhee rriisskk ooff
eelleeccttrriiccaall sshhoocckk,, ddoo nnoott ppeerrffoorrmm aannyy sseerrvviicciinngg
ootthheerr tthhaann tthhaatt ccoonnttaaiinneedd iinn tthheessee ooppeerraattiinngg
iinnssttrruuccttiioonnss uunnlleessss yyoouu aarree qquuaalliiffiieedd ttoo ddoo ssoo
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
UUNNIITT CCOONNTTAAIINNSS RR--441100AA
RREEFFRRIIGGEERRAANNTT!!
FFaaiilluurree ttoo uussee pprrooppeerr sseerrvviiccee ttoooollss mmaayy rreessuulltt iinn
eeqquuiippmmeenntt ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
RR--441100AA ooppeerraattiinngg pprreessssuurree eexxcceeeeddss tthhee lliimmiitt ooff RR--
2222 PPrrooppeerr sseerrvviiccee eeqquuiippmmeenntt iiss rreeqquuiirreedd SSeerrvviiccee
uussiinngg oonnllyy RR--441100AA RReeffrriiggeerraanntt aanndd aapppprroovveedd PPOOEE
ccoommpprreessssoorr ooiill
WWAARRNNIINNGG
SSAAFFEETTYY HHAAZZAARRDD!!
OOppeerraattiinngg tthhee uunniitt wwiitthhoouutt tthhee aacccceessss ppaanneellss
pprrooppeerrllyy iinnssttaalllleedd mmaayy rreessuulltt iinn sseevveerree ppeerrssoonnaall
iinnjjuurryy oorr ddeeaatthh
DDoo nnoott ooppeerraattee tthhee uunniitt wwiitthhoouutt tthhee eevvaappoorraattoorr ffaann
aacccceessss ppaanneell oorr eevvaappoorraattoorr ccooiill aacccceessss ppaanneell iinn
ppllaaccee
WWAARRNNIINNGG
WWAARRNNIINNGG!!
TThhiiss pprroodduucctt ccaann eexxppoossee yyoouu ttoo cchheemmiiccaallss
iinncclluuddiinngg lleeaadd,, wwhhiicchh aarree kknnoowwnn ttoo tthhee SSttaattee ooff
CCaalliiffoorrnniiaa ttoo ccaauussee ccaanncceerr aanndd bbiirrtthh ddeeffeeccttss oorr
ootthheerr rreepprroodduuccttiivvee hhaarrmm FFoorr mmoorree iinnffoorrmmaattiioonn ggoo
ttoo wwwwww PP6655WWaarrnniinnggss ccaa ggoovv
IImmppoorrttaanntt:: Wear appropriate gloves, arm sleeve
protectors and eye protection when
servicing or maintaining this equipment.
IImmppoorrttaanntt:: Air filters and media wheels or plates shall
meet the test requirements in L 900.

88-4TCA4002-1A-EN 3
Introduction 4
Step 2 — Determine Unit Clearances 5
Step 3 — Review Location and
Recommendation Information 7
Step 4 — Unit Installation 8
Step 5 — Unit Startup 17
Sequence of Operation 18
Heater and Airflow Tables 19
Maintenance 21
Important Product Information 21
Table of Contents

488-4TCA4002-1A-EN
Introduction
Read this manual carefully before attempting to install,
operate, or perform maintenance on this unit
Installation and maintenance should be performed by
qualified service technicians only This unit is listed by
Underwriters Laboratory
Packaged units are designed for outdoor mounting
with a vertical condenser discharge They can be
located either at ground level or on a roof in
accordance with local codes Each unit contains an
operating charge of refrigerant as shipped
Extreme mounting kits are available for slab
(BAYEXMK003A), utility curb (BAYEXMK002B) and
perimeter curb (BAYEXMK001A) mountings
This guide is organized as follows:
• Step 1 — Inspect Shipment
• Step 2 — Determine Unit Clearances
• Step 3 — Review Location & Recommendation
Information
• Step 4 — Unit Installation
• Step 5 — Unit Startup
• Sequence of Operation
• Maintenance
SStteepp 11 —— IInnssppeecctt SShhiippmmeenntt
1 Check for damage after the unit is unloaded Report
promptly to the carrier any damage found to the
unit Do not drop the unit
IImmppoorrttaanntt:: To prevent damage to the sides and top of
the unit when hoisting, use “spreader
bars”.
2 Check the unit’s nameplate to determine if the unit
is correct for the intended application The power
supply must be adequate for both the unit and all
accessories
3 Check to be sure the refrigerant charge has been
retained during shipment Remove the Compressor
access panel to access the 1/4" flare pressure taps
4 If this unit is being installed on a curb, verify that
the correct curb is provided with the unit
• Use model BAYCURB060A
5 If the unit is being hoisted, accessory kit
BAYLIFT002A is recommended It includes a kit of
four (4) lifting lugs and instructions
NNootteess::
• If practical, install any internal accessories to
the unit at the shop.
• The packaged units have been evaluated in
accordance with the Code of Federal
Regulations, Chapter XX, Part 3280 or the
equivalent.
“S ITABLE FOR MOBILE HOME SE.”

88-4TCA4002-1A-EN 5
Step 2 Determine Unit Clearances
Figure 1. OUTLINE DRAWING

688-4TCA4002-1A-EN
Figure 2. OUTLINE DRAWING
DRAIN PAN CONNECTION
THROUGH HOLE
SStteepp 22 —— DDeetteerrmmiinnee UUnniitt CClleeaarraanncceess

88-4TCA4002-1A-EN 7
Step 3 Review Location and Recommendation
Information
HHoorriizzoonnttaall AAiirrffllooww UUnniittss
1 Location of the unit must allow service clearance
around it to ensure adequate serviceability,
maximum capacity, and peak operating efficiency
2 These units are designed for outdoor installation
They may be installed directly on a slab, wood
flooring, or on Class A, B, or C roof covering
material The discharge air from the condenser fans
must be unrestricted for a minimum of 3 feet above
the unit
3 Check the handling facilities to ensure the safety of
personnel and the unit(s)
4 The unit must be mounted level for proper drainage
of water through the drain holes in the base pan
5 The unit should not be exposed to direct roof water
runoff
6 Flexible duct connectors must be of a flame
retardant material All duct work outside of the
structure must be insulated and weatherproofed in
accordance with local codes
7 Holes through exterior walls or roof must be sealed
in accordance with local codes
8 All fabricated outdoor ducts should be as short as
possible
CClleeaarraanncceess
1 The recommended service clearances for single-
unit installations are stated in Table 1, p 9
2 Any reduction of the unit clearances indicated in
these figures may result in condenser coil
starvation or the recirculation of warm condenser
air Actual clearances, which appear to be
inadequate should be reviewed with a local
engineer
3 See the unit’s nameplate for the absolute minimum
clearance between the unit and any combustible
surfaces
DDoowwnn AAiirrffllooww UUnniittss
1 Location of the unit must allow service clearance
around it to ensure adequate serviceability,
maximum capacity, and peak operating efficiency
2 Refer to the Installation section for instruction on
converting the supply and return airflow covers to
down airflow
3 The field assembled Roof Mounting Curb
(BAYCURB060A) or a field fabricated curb should
be in place before the unit is hoisted to the roof top
The Roof Mounting Curb (frame) must be installed
on a flat, level section of the roof (maximum of 1/4"
per foot pitch) and provide a level mounting surface
for the unit Also, be sure to provide sufficient
height above the roof to prevent water from
entering the unit
4 Be sure the mounting curb spans structural
members (trusses) of the roof, thereby providing
sufficient support for the weight of the unit, the
curb, the duct(s), and any factory or field installed
accessories
5 The unit must be mounted level for proper drainage
of water through the drain holes in the base pan
6 Be sure the hole in the structure for the ducts is
large enough to accommodate the fabricated ducts
and the insulation surrounding them Flexible duct
connectors must be of a flame retardant material
All duct work outside of the structure must be
insulated and weatherproofed in accordance with
local codes
7 Holes through exterior walls or roof must be sealed
in accordance with local codes
8 These units are design certified for outdoor
installation They may be installed directly on a
slab, wood flooring, or on Class A, B, or C roof
covering material The discharge air from the
condenser fans must be unrestricted for a minimum
of 3 feet above the unit
9 Check the handling facilities to ensure the safety of
personnel and the unit(s)
CClleeaarraanncceess
1 The recommended service clearances for single-
unit installations are stated in Table 1, p 9
2 Any reduction of the unit clearances indicated in
these figures may result in condenser coil
starvation or the recirculation of warm condenser
air Actual clearances, which appear to be
inadequate should be reviewed with a local
engineer
3 See the unit’s nameplate for the absolute minimum
clearance between the unit and any combustible
surfaces

888-4TCA4002-1A-EN
Step 4 Unit Installation
NNoottee:: The factory ships this unit for horizontal
installation.
TToo IInnssttaallll tthhee uunniitt aatt ggrroouunndd lleevveell::
1 Place the unit on a pad the size of the unit or larger
The unit must be mounted level for proper drainage
of water through the holes in the base pan To
attach the unit securely to the slab, use extreme
mounting kit, BAYEXMK003A
The pad must not come in contact with the
structure Be sure the outdoor portion of the supply
and return air ducts are as short as possible
2 Location of the unit must allow service clearance
around it Clearance of the unit must be given
careful consideration See, “Step 2 — Determine
Unit Clearances,” p 5
NNoottee:: Any reduction of the unit clearances indicated
in these illustrations may result in condenser
coil starvation or the recirculation of warm
condenser air. Actual clearances, which
appear to be inadequate should be reviewed
with a local engineer.
3 Attach the supply and return air ducts to the unit as
explained in the ductwork Installation section
4 Flexible duct connectors must be of a flame
retardant material Insulate any ductwork outside of
the structure with at least two (2) inches of
insulation and weatherproof There must be a
weatherproof seal where the duct enters the
structure
5 Do not expose the unit to direct roof water runoff
6 Seal all holes through exterior walls in accordance
with local codes
7 Continue with the following installation sections to
complete the installation: Ductwork, Filter and
Electrical Wiring
RRooooffttoopp IInnssttaallllaattiioonn —— CCuurrbb MMoouunnttiinngg
CCoonnvveerrtt HHoorriizzoonnttaall AAiirrffllooww ttoo DDoowwnn AAiirrffllooww
The factory ships the unit for horizontal airflow
Perform this procedure to convert it to down airflow:
1 Remove the three (3) sheet metal screws securing
the supply air cover and the four (4) sheet metal
screws securing the return air cover from the base
of the unit Remove the covers from the base
2 Place the covers over the horizontal supply and
return openings (painted side out) Align the screw
holes, and secure using the same screws removed
in step 1
IInnssttaallll FFuullll PPeerriimmeetteerr RRooooff MMoouunnttiinngg CCuurrbb
1 Verify that the roof mounting curb is correct for the
unit There are two curbs depending on the unit
cabinet sizes:
• Use model BAYCURB060A
2 Assemble and install the curb following the
instructions in the Installer's Guide included with
the appropriate curb

88-4TCA4002-1A-EN 9
Figure 3. Typical Ground Level Application
NNoottee:: se the extreme mounting kit, BAYEXMK003AA, to secure the unit to the slab.
SIDING
RETURN
AIR DUCT
SUPPLY
AIR DUCT
EXTERIOR
WALL INSULATE
WEATHERPROOF
OR RAIN SHIELD FLEXIBLE DUCT
CONNECTORS
OUTDOOR
AIR DISCHARGE
SUPPORT PAD
FOUNDATION
Table 1. Recommended Service Clearance
Recommended
Service Clearance
BACK SIDE LEFT SIDE RIGHT SIDE FRONT SIDE TOP
0” 30” 42” 42” 36”
Figure 4. Converting Horizontal to Down Airflow
HORIZONTAL SUPPLY
AIR COVER
SHEET METAL
SCREWS
HORIZONTAL RETURN
AIR COVER
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

10 88-4TCA4002-1A-EN
Table 2. Lifting and Rigging
Base of unit
rest on top of
curb rails
Drip lip on
perimeter of
unit
Spreader Bars
Gasket Seal
Drip Lip
Dimple
BAYLIFT002A
Lifting Lugs
IImmppoorrttaanntt:: Do not lift the unit without test lifting for
balance and rigging. Do not lift the unit in
windy conditions or above personnel. Do
not lift the unit by attaching clevis, hooks,
pins, or bolts to the unit casing, casing
hardware, corner lugs, angles, tabs, or
flanges. Failure to observe these warnings
may result in equipment damage.
1 Before preparing the unit for lifting, check the unit
dimension drawings for center of gravity for lifting
safety (“Step 2 — Determine Unit Clearances,” p
5) Because of placement of internal components,
the unit’s weight may be unevenly distributed
Approximate unit weights are also provided in the
unit drawings
NNoottee:: nit rigging and hoisting requires accessory kit
BAYLIFT002A. It includes a kit of four (4) lifting
lugs.
2 Insert the four lifting lugs in the openings provided
in the drip lip on each end of the unit A tap or jerk
to the lug will overcome the interference that arises
due to the dimple on the lug
3 When hoisting the unit, be sure that a proper
method of rigging is used Use slings and spreader
bars for protection during lifting Always test-lift the
unit to determine the exact unit balance and
stability before hoisting it to the installation
location
4 When the curb and air ducts have been properly
installed, the unit is ready to be hoisted to the roof
and set in position
IImmppoorrttaanntt::
• To prevent damage to the sides and top
of the unit when hoisting use “spreader
bars”.
• The unit must be lowered into position.
The P.V.C. rubber tape on the curb
flange permits the unit to be
repositioned if required without
destroying the P.V.C. rubber seals
affixed to the mounting curb.
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

88-4TCA4002-1A-EN 11
PPllaacciinngg tthhee UUnniitt oonn tthhee MMoouunnttiinngg CCuurrbb
1 The unit is designed with a perimeter drip lip that is
lower than the unit base pan
2 Position the unit drip lip down over and in contact
with the outside corner of the curb Continue to
lower the unit on top of the curb, with the unit drip
lip astraddle, and in contact with, both the end and
side rail of the curb The unit should now rest on
top of the curb Use the extreme mounting kit,
BAYEXMK001A, to add additional hold down
strength to the mounting
RRooooffttoopp IInnssttaallllaattiioonn —— FFrraammee MMoouunnttiinngg
For rooftop applications using field fabricated frame
and ducts use the following procedure:
1 Prepare the hole in the roof in advance of installing
the unit
2 Secure the horizontal or down airflow ducts to the
roof Refer to the previous Convert from Horizontal
Airflow to Down Airflow section if conversion is
needed
3 All fabricated outdoor ducts should be as short as
possible
4 Place the unit on the frame
5 The unit must be mounted level for proper drainage
of water through the holes in the base pan
6 Secure the unit to the frame
7 Insulate any ductwork outside of the structure with
at least two (2) inches of insulation and then
weatherproof There must be a weatherproof seal
where the duct enters the structure
8 The unit should not be exposed to direct roof water
runoff
9 Flexible duct connectors must be of a flame
retardant material All duct work outside of the
structure must be insulated and weatherproofed in
accordance with local codes
10 Access and service clearances for the unit must be
given careful consideration when locating the duct
entrance openings Figures “Step 2 — Determine
Unit Clearances,” p 5 provide unit dimensions
11 Continue with the following installation sections to
complete the installation: Ductwork, Filter, and
Electrical Wiring
RRooooffttoopp IInnssttaallllaattiioonn —— FFrraammee MMoouunnttiinngg
For roof top applications using field fabricated ducts
and sleeper rails rather than a curb or frame, use the
following procedure:
1 Locate and secure the sleeper rails to the roof by
bolting (three (3) rails required) One on each end to
support the edges of the unit and one across the
center of the unit The center rail must run inside
both drip lips Vibration isolators should be
installed, adjust as necessary for your sleeper rails
The isolators must be placed on base pan, not drip
lip Add flashing as required Flashing must
conform to local building codes
2 Prepare the hole in the roof in advance of installing
the unit
3 Secure the horizontal or down airflow ducts to the
roof Refer to the previous Convert from Horizontal
Airflow to Down Airflow section if conversion is
needed
4 All fabricated outdoor ducts should be as short as
possible
5 Place the unit on the rails
6 The unit must be mounted level for proper drainage
of water through the holes in the base pan
7 Secure the unit to the rails
8 Insulate any ductwork outside of the structure with
at least two (2) inches of insulation and then
weatherproof There must be a weatherproof seal
where the duct enters the structure
9 No exposure to direct roof water runoff
10 Flexible duct connectors must be of a flame
retardant material All duct work outside of the
structure must be insulated and weatherproofed in
accordance with local codes
11 Access and service clearances for the unit must be
given careful consideration when locating the duct
entrance openings Figures “Step 2 — Determine
Unit Clearances,” p 5 provide unit dimensions
12 Continue with the following installation sections:
Ductwork, Filter and Electrical Wiring
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

12 88-4TCA4002-1A-EN
Table 3. Typical Rooftop Horizontal Airflow Application with Frame
Supply Air
Return Air
Roof Flashing
Channel Iron Center
Support (Center Support
required on all frame
applications).
Angle Iron Frame
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

88-4TCA4002-1A-EN 13
Table 4. Typical Rooftop Down Airflow Application with Frame
Return Air
Roof Flashing
Channel Iron Center Support
(center support required on all
frame applications).
Angle Iron Frame
Roof
Flashing
Supply
Air
DDuuccttwwoorrkk IInnssttaallllaattiioonn
AAttttaacchhiinngg DDoowwnnffllooww DDuuccttwwoorrkk ttoo RRooooff CCuurrbb
Supply and return air flanges are provided on the roof
curb for easy duct installation All ductwork must be
run and attached to the curb before the unit is set into
place
AAttttaacchhiinngg DDoowwnnffllooww DDuuccttwwoorrkk ttoo RRooooff FFrraammee
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three (3)
inch canvas connectors to minimize noise and vibration
transmission
Elbows with turning vanes or splitters are
recommended to minimize air noise and resistance
The first elbow in the ductwork leaving the unit should
be no closer than two (2) feet from the unit, to minimize
noise and resistance
To prevent leaking, do not attach the ductwork to the
bottom of the unit base Refer to the bottom example in
the figure below
Figure 5. Attaching Down Airflow Ductwork
FIELD DUCT
UNIT DUCT
FLANGE
UNIT BASE
AIR PROOF
THIS SEAM
FIELD DUCT
UNIT DUCT
FLANGE UNIT BASE
AIR PROOF
THIS SEAM
FIELD
DUCT
UNIT DUCT FLANGE
UNIT BASE
AIR PROOF
THIS SEAM
FIELD DUCT
UNIT DUCT
FLANGE
UNIT BASE
NOT RECOMMENDED
WATERPROOF SEAM
WITH BUTYL OR
SILICONE
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

14 88-4TCA4002-1A-EN
AAttttaacchhiinngg HHoorriizzoonnttaall DDuuccttwwoorrkk ttoo UUnniitt
All conditioned air ductwork should be insulated to
minimize heating and cooling duct losses Use a
minimum of two (2) inches of insulation with a vapor
barrier The outside ductwork must be weatherproofed
between the unit and the building
When attaching ductwork to a horizontal unit, provide a
flexible watertight connection to prevent noise
transmission from the unit to the ducts The flexible
connection mmuusstt be indoors and made out of heavy
canvas
NNoottee:: Do not draw the canvas taut between the solid
ducts.
Figure 6. Attaching Horizontal Airflow Ductwork
FIELD DUCT
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
FIELD DUCT
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
CCoonnddeennssaattee DDrraaiinn PPiippiinngg
Follow local codes and standard piping practices when
running the drain line Pitch the line downward away
from the unit Avoid long horizontal runs See Figure
8, p 14
Figure 7. Condensate Drain
Attach standard 3/4”NPT
tting to drain pan Construct condensate drain
pipe and route through inner wall,
across unit internally and out the
exterior wall as shown
Construct standard
“P Trap” Outside of unit
NNoottee:: Do not use reducing fittings in the drain lines.
The condensate drain must be:
• Made of 3/4” pipe size
• Pitched 1/4” per foot to provide free drainage to
convenient drain system
• Trapped
• Must be connected to a closed drain system unless
the trap is properly vented
Figure 8. Typical Condensate Drain Piping
3/4" PVC OR COPPER
TUBING AND FITTINGS
1-1/2" MIN.
1-1/2" MIN.
AAiirr FFiilltteerr IInnssttaallllaattiioonn
Filter is field supplied in return duct and sized for 300
feet per minute face velocity
IImmppoorrttaanntt:: Air filters and media wheels or plates shall
meet the test requirements in L 900
EElleeccttrriiccaall WWiirriinngg
NNoottee:: This unit is factory wired for 230V. See wiring
diagram for 208V conversion.
EElleeccttrriiccaall CCoonnnneeccttiioonnss
Electrical wiring and grounding must be installed in
accordance with local codes or, in the absence of local
codes, with the National Electrical Code ANSI/NFPA 70,
Latest Revision
EElleeccttrriiccaall PPoowweerr
It is important that proper electrical power be available
for the unit Voltage variation should remain within the
limits stamped on the unit nameplate
DDiissccoonnnneecctt SSwwiittcchh
Provide an approved weatherproof disconnect within
close proximity and wwiitthhiinn ssiigghhtt ooff tthhee uunniitt If
disconnect must be mounted to the cabinet, the
location shown in should be the only one considered
OOvveerr CCuurrrreenntt PPrrootteeccttiioonn
The branch circuit feeding the unit must be protected
as shown on the unit's rating plate
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

88-4TCA4002-1A-EN 15
PPoowweerr WWiirriinngg
The power supply lines must be run in weather-tight
conduit to the disconnect and into the side of the unit
control box Provide strain relief for all conduit with
suitable connectors
Provide flexible conduit supports whenever vibration
transmission may cause a noise problem within the
building structure
1 Remove the Control/Heat access panel Pass the
power wires through the Power Entry hole in the
end of the unit
2 Connect the high voltage wires to the appropriate
contactor terminals Single phase units use a two
(2) pole contactor and three phase units use three
(3) pole contactor Connect the ground to the
ground lug on the chassis
Ensure all connections are tight
Table 5. Power Connections
Unit Ground Lug
Contactor
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

16 88-4TCA4002-1A-EN
Table 6. Field Wiring Diagram
Notes:
1. Fused disconnect size,
power wiring and grounding
of equipment must comply
with codes.
2. Be sure power supply agrees
with equipment and heater
nameplate.
3. Low voltage wiring to be 18
AWG minimum conductor.
4. See heater nameplate for
current rating of heater
used.
5. See unit and heater
diagram for electrical
connection details.
6. Jumper must be connected
between 1 and 2 for fan to
operate in heating.
7. Some thermostats provide
the ‘G’ signal in the cooling
mode only. To provide the ‘G’
signal in the heating mode
an accessory relay is
required. See fig. 3 for
proper connections.
8. For cooling only omit the
electric heater, associated
power wires and the ‘W’
signal thermostat wire.
9. Fig. 4 demonstrates
connection of the two stage
electric heat thermostat
accessory only. For further
unit connection details refer
to the other figures.
10. The 41A (BR) wire is first
stage electric heat. If the
electric heater accessory has
two heating stages the 41C
(BR) wire is second stage
electric heat.
from drw. D758087P01
CCoonnttrrooll WWiirriinngg ((CCllaassss IIII))
Low voltage control wiring should not be run in conduit
with power wiring unless Class 1 wire of proper voltage
rating is used Route the thermostat cable or equivalent
single leads of No 18 AWG colored wire from the
thermostat subbase terminals through the rubber
grommet on the unit See “Step 2 — Determine Unit
Clearances,” p 5 for the control entry (24V Entry)
location Make connections as shown on the Wiring
diagrams above
Do not short thermostat wires since this will damage
the control transformer
Refer to the table below for recommended wire sizes
and lengths for installing the unit thermostat The total
resistance of these low voltage wires must not exceed
one (1) ohm Any resistance in excess of 1 ohm may
cause the control to malfunction because of the
excessive voltage drop
Table 7. Thermostat Wire Size and Maximum Length
Wire Size Maximum Length (Ft)
18 75
16 125
14 200
IImmppoorrttaanntt:: pon completion of wiring, check all
electrical connections, including factory
wiring within the unit, and make sure all
connections are tight. Replace and secure
all electrical box covers and access panels
before leaving the unit or turning on the
power to the unit.
SStteepp 44 —— UUnniitt IInnssttaallllaattiioonn

88-4TCA4002-1A-EN 17
Step 5 Unit Startup
PPrree--SSttaarrtt QQuuiicckk CChheecckklliisstt
☐Is the unit properly located and level with the
proper clearances? See, “Step 2 — Determine Unit
Clearances,” p 5
☐Is the duct work correctly sized, run, taped,
insulated, and weatherproofed with proper unit
arrangement as shown in the ductwork installation
section?
☐Is the condensate line properly sized, run, trapped,
and pitched and shown in the Condensate Drain
Piping section?
☐Is the filter of the correct size and quantity? Is it
clean and in place? See Air Filter Installation
section
☐Is the wiring properly sized and run according to the
unit wiring diagram?
☐Are all the wiring connections, including those in
the unit tight?
☐Has the unit been properly grounded and fused
with the recommended fuse size?
☐Is the thermostat well located, level, and correctly
wired? See Electrical Wiring section
☐Have the air conditioning systems been checked at
the service ports for charge and leak tested if
necessary?
☐Do the condenser fan and indoor blower turn free
without rubbing and are they tight on the shafts?
☐Has all work been done in accordance with
applicable local and national codes?
☐Are all covers and access panels in place to prevent
air loss and safety hazards?
SSttaarrttiinngg tthhee UUnniitt iinn CCoooolliinngg MMooddee
NNoottee:: See the section on Sequence of Operation for a
description of the cooling operating sequence.
To start the unit in the cooling mode, set the comfort
control to CCOOOOLL and to a setting below room
temperature The condenser fan motor, compressor
and evaporator fan motor will operate automatically
Continuous fan mode during Cooling operation may
not be appropriate in humid climates If the indoor air
exceeds 60% relative humidity or simply feels
uncomfortably humid, it is recommended that the fan
only be used in the AAUUTTOO mode
OOppeerraattiinngg PPrreessssuurree CChheecckkss
After the unit has operated in the cooling mode for a
short period of time, install pressure gauges on the
gauge ports of the discharge and suction line valves
(behind the Compressor access panel) Check the
suction and discharge pressures and compare them to
the normal operating pressures provided in the unit’s
SERVICE FACTS
NNoottee:: Do not use the PRESS RE C RVES from the
unit's SERVICE FACTS to determine the unit
refrigerant charge. The correct charge is shown
on the unit nameplate. To charge the system
accurately, weigh in the charge according to the
unit nameplate and check subcooling against the
Subcooling Charging Table in the SERVICE
FACTS.
VVoollttaaggee CChheecckk
With the compressor operating, check the line voltage
at the unit (contactor is located behind the Control
access panel) The voltage should be within the range
shown on the unit nameplate If low voltage is
encountered, check the size and length of the supply
line from the main disconnect to the unit The line may
be undersized for the length of the run
CCoooolliinngg SShhuutt DDoowwnn
Set the comfort control to OOFFFF or to a setting above
room temperature
IImmppoorrttaanntt:: De-energize the main power disconnect
ONLY when servicing the unit. Power may
be required to keep the heat pump
compressor warm and to boil off
refrigerant in the compressor.
SSttaarrttiinngg tthhee UUnniitt iinn HHeeaattiinngg MMooddee
NNoottee:: See the section on Sequence of Operation for a
description of the heat pump heating operating
sequence.
Check that all grills and registers are open and all unit
access panels are closed before start-up
Set the comfort control above room temperature until
achieving a first stage call for heat and set the fan to
AAUUTTOO or OONN
HHeeaattiinngg SShhuutt DDoowwnn
Set the comfort control to OOFFFF or at a setting below
room temperature

18 88-4TCA4002-1A-EN
Sequence of Operation
GGeenneerraall
Operation of the system cooling (and optional heating)
cycles is controlled by the comfort control Once the
comfort control is set to either HHEEAATT or CCOOOOLL, unit
operation is automatic The optional automatic
changeover control, when set to AAUUTTOO, automatically
changes to heat or cool with sufficient room
temperature change
The fan can be set to OONN, causing continuous
evaporator (indoor) fan operation or set to AAUUTTOO
causing fan operation to coincide with heating or
cooling run cycles Continuous fan mode during
cooling operation may not be appropriate in humid
climates If the indoor air exceeds 60% relative
humidity or simply feels uncomfortably humid, it is
recommended that the fan only be used in the AAUUTTOO
mode
CCoooolliinngg MMooddee
With the comfort control set to CCOOOOLL and the fan set to
AAUUTTOO, the compressor contactor (CC) and the indoor
fan motor (IDM) are energized
The energized compressor contactor (CC) completes
the circuit to the compressor (CPR) and a secondary
circuit to the outdoor fan motor (ODM) If the
compressor safety controls are closed, the compressor
(CPR) will operate with the outdoor fan motor (ODM)
The indoor fan motor (IDM) will operate The comfort
control will continue to cycle the compressor and fans
to maintain the desired temperature
With the fan set to OONN, the indoor fan motor (IDM) will
continue to run regardless of compressor and
condenser fan operation
HHeeaattiinngg MMooddee
Heating mode uses electric heaters, which are installed
separately Refer to the Supplemental Electric Heaters
Installer's Guide for additional information
On a call for heat, power from the comfort control is
received at “W1”, which energizes the “AH” contactor
coil The “AH” contactor closes powering the heater,
provided all element limits are closed If two stages of
heat are provided and additional heat is required, the
comfort control’s second stage “W2” circuit is
energized powering the “BH” contactor coil
NNoottee:: The indoor comfort control must be configured
to provide a “G” signal to energize the indoor
fan relay ((FF)) during the heating mode. The
heater control circuit will not be energized unless
the indoor fan relay ((FF)) is energized.

88-4TCA4002-1A-EN 19
Heater and Airflow Tables
Table 8. Heater Table
Heater Minimum Heater Airflow CFM
4TCA4024-
C1000AA
4TCA4030-
C1000AA
4TCA4036-
C1000AA
4TCA4042-
C1000AA
4TCA4048-
C1000AA
4TCA4060-
C1000AA
BAYHTR1V05LUGAA 450 680 870 800 1000 1100
BAYHTR1V08LUGAA 625 680 870 800 1000 1100
BAYHTR1V10LUGAA 625 680 870 800 1000 1100
BAYHTR1V15BRKAA 970 950 930 1000 1100
BAYHTR1V20BRKAA 1300 1500
Table 9. Airflow Tables
4TCA4024C1 ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Low
CFM 878 814 753 690 623
WATTS 124 132 139 147 151
Medium
CFM 879 823 767 707 644
WATTS 154 162 169 177 181
High
CFM 896 846 799 741 680
WATTS 253 261 267 272 276
Note: Airflow must not exceed 900 CFM due to condensate blowoff.
4TCA4030C1 ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Low
CFM 1107 1061 1010 961 907 854 799 745
WATTS 209 219 228 236 245 254 261 266
Medium
CFM 1073 1029 988 944 899
WATTS 348 357 365 374 381
High
CFM 1110 1065 1019 971 924
WATTS 343 353 363 373 382
Note: Airflow must not exceed 1125 CFM due to condensate blowoff.
4TCA4036C1 ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Low
CFM 1279 1243 1203 1159 1112 1065 1017 967
WATTS 269 278 288 298 307 317 327 337
Medium
CFM 1346 1319 1276 1233 1187 1141 1096 1050 1004 956
WATTS 311 319 330 341 352 361 371 382 392 401
High
CFM 1334 1286 1244 1207 1164 1144
WATTS 458 470 482 492 502 511
Note: Airflow must not exceed 1350 CFM due to condensate blowoff.
SSeeqquueennccee ooff OOppeerraattiioonn

20 88-4TCA4002-1A-EN
4TCA4042C1 ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Low
CFM 1520 1461 1390 1322 1256 1184 1090
WATTS 287 298 309 320 331 343 359
Medium
CFM 1512 1439 1378 1321 1259 1208 1137
WATTS 429 442 452 462 473 484 494
High
CFM 1572 1514 1457 1401 1340 1256 1189
WATTS 461 473 486 498 510 529 539
Note: Airflow must not exceed 1575 CFM due to condensate blowoff.
4TCA4048C1 ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Low
CFM 1670 1605 1541 1486 1429 1395 1312 1256 1196
WATTS 380 393 406 420 432 443 454 463 472
Medium
CFM 1771 1708 1633 1578 1522 1438 1383
WATTS 554 569 583 597 610 636 648
High
CFM 1795 1715 1701 1641 1585 1508 1458
WATTS 602 628 623 637 650 677 689
Note: Airflow must not exceed 1800 CFM due to condensate blowoff.
4TCA4060C1 ESP 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Low
CFM 1965 1895 1799 1762 1697 1635 1580 1532
WATTS 516 534 554 572 588 602 617 624
Medium
CFM 2009 1967 1914 1866 1812 1739 1688 1636 1587 1533
WATTS 609 629 649 655 678 692 704 716 728 741
High
CFM 2020 1960 1927 1852 1819 1771 1724
WATTS 771 792 807 822 838 850 864
Note: Airflow must not exceed 2250 CFM due to condensate blowoff.
FFiinnaall IInnssttaallllaattiioonn CChheecckklliisstt
IImmppoorrttaanntt:: Perform a final unit inspection to be sure
that factory tubing has not shifted during
shipment. Adjust tubing if necessary so
tubes do not rub against each other when
the unit runs. Also be sure that wiring
connections are tight and properly secured.
☐Does the unit run and operate as described in the
Sequence of Operation section in response to the
room thermostat?
☐Are the condenser fan and indoor blower operating
correctly with proper rotation and without undue
noise?
☐Is the compressor operating correctly and has the
system been checked with a charging chart?
☐Has the voltage and running current been checked
to determine if it is within limits?
☐Has the thermostat been checked for calibration
and the air discharge grills adjusted to balance the
system?
☐Has the ductwork been checked for air leaks and
condensation?
☐Has the furnace manifold pressure been checked
and adjusted if necessary?
☐Has the heating air temperature rise been checked?
☐Has the unit been checked for tubing and sheet
metal rattles? Are there any other unusual noises to
be checked?
☐Are all covers and panels in place and properly
fastened?
☐Has the owner been instructed on the proper
operation and maintenance of the unit? Be sure to
leave this manual with the owner
SSeeqquueennccee ooff OOppeerraattiioonn