Trane 4YCC4024E1060A User manual

SSAAFFEETTYY WWAARRNNIINNGG
Only qualified personnel should install and service the equipment The installation, starting up, and servicing of heating, ventilating, and air-conditioning
equipment can be hazardous and requires specific knowledge and training Improperly installed, adjusted or altered equipment by an unqualified person
could result in death or serious injury When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that
are attached to the equipment
January 2024 1188--EEBB4400DD11--11EE--EENN
Single Packaged Gas/Electric
13.4 SEER2 Convertible, 2 - 5 Ton
4YCC4024E1060A
4YCC4030E1070A
4YCC4036E1070A
4YCC4036E1090A
4YCC4042E1060A
4YCC4042E1090A
4YCC4048E1070A
4YCC4048E1090A
4YCC4060E1090A
4YCC4060E1115A
NNoottee:: “Graphics in this document are for representation
only. Actual model may differ in appearance.”
Installation and Operations Manual

©2024 18-EB40D1-1E-EN
SAFETY SECT ON
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 GGAASSEESS!!
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ssttaattee ooff CCaalliiffoorrnniiaa ttoo ccaauussee ccaanncceerr,, bbiirrtthh ddeeffeeccttss,, oorr
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PPrrooppoossiittiioonn 6655
WWAARRNNIINNGG
HHAAZZAARRDDOOUUSS VVOOLLTTAAGGEE!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
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WWAARRNNIINNGG
SSAAFFEETTYY AANNDD EELLEECCTTRRIICCAALL HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
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CCAAUUTTIIOONN
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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
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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
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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.

18-EB40D1-1E-EN 3
Introduction, Unit Inspection and
Specification 4
Introduction 4
Inspect Shipment 4
Product Specifications 5
Charging in Cooling above 55°F OD
Ambient 7
Determine Unit Clearances 8
Review Location and Recommendation
Information 10
Unit Installation 12
Install Flue Hood 12
Ground Level Installation 12
Rooftop Installation—Curb
Mounting 12
12
Lifting and Rigging 13
Rooftop Installation — Frame
Mounting 14
Rooftop Installation — No Curb/
Frame 15
Ductwork Installation 17
Attaching Downflow Ductwork to
Roof Curb 17
Attaching Downflow Ductwork to
Roof Frame 17
Gas Piping Installation 18
Air Filter Installation 21
Electrical Wiring 22
Unit Startup 24
Pre-Start Quick Checklist 24
Starting the Unit in Cooling Mode 24
Starting the Unit in Heating Mode 24
Sequence of Operation 25
Final Installation Checklist 26
Maintenance 27
Service Maintenance 27
Pressure Curves 29
Indoor Fan Performance 35
Refrigerant Circuit 41
Troubleshooting Chart 42
Table of Contents
Important Product Information 44

418-EB40D1-1E-EN
ntroduction, Unit nspection and Specification
ntroduction
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 DO NOT use this furnace for
temporary heating of buildings under construction
As shipped from the factory, this unit is for use with
natural gas only It is listed by Underwriters
Laboratory An LPG conversion kit is available A high
altitude installation kit of additional orifice sizes is
available Extreme mounting kits for slab and curbs are
also available
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 or National Fuel Gas Code
(ANSI-Z223 1A) Latest Revision Since these units are
designed exclusively for outdoor operation, additional
flue venting systems are not required 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
nspect Shipment
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” see, “Rooftop
Installation — No Curb/Frame,” p. 15
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 The Flue Hood is included with the unit’s literature
pack
5 If this unit is being installed on a curb, verify that
the correct curb is provided with the unit
• 4YCC4024–4036 use model BAYCURB050A
• 4YCC4042–4060 use model BAYCURB051A
6 If the unit is being hoisted, accessory kit
BAYLIFT002B 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”.

18-EB40D1-1E-EN 5
Product Specifications
MODEL 4YCC4024*1 4YCC4030*1 4YCC4036*1070
[4YCC4036*1090]
RATED Volts/PH/Hz 208–230/1/60
Performance Cooling BTUH (a) 23200 28000 36400
Indoor Airflow (CFM) 785 880 1215
Power Input (KW) LOCATED ON UNIT NAMEPLATE
EER2/SEER2 BTU/Watt-Hr 11.00 / 13.40
Sound Power Rating [dB(A)] (b) 66.6 70 69.3
PERFORMANCE HEATING(c)
Input BTUH-1st Stage (Natural Gas) (d) LOCATED ON UNIT NAMEPLATE
AFUE 81
Temp. Rise -min/max (°F) 30/60 30/60 30/60 [35/65]
Orifice Qty/drill size (Nat Gas) 2 / #37 2 / #33 2 / #33 [3 / #37]
POWER CONN. — V/Ph/Hz 208–230/1/60
Min. Brch. Cir. Ampacity (e) LOCATED ON UNIT NAMEPLATE
Fuse Size — Max. (amps) LOCATED ON UNIT NAMEPLATE
Fuse Size — Recmd. (amps) LOCATED ON UNIT NAMEPLATE
COMPRESSOR SCROLL
VOLTS/PH/HZ 208–230/1/60
R.L. Amps — L.R. Amps LOCATED ON UNIT NAMEPLATE
OUTDOOR COIL — TYPE SPINE FIN
Rows/F.P.I 2 / 24
Face Area (sq. ft.) 13.2 13.3 15.5
Tube Size (in.) 3/8
INDOOR COIL — TYPE MCHE
Rows/F.P.I 2/16 2/16 2/16
Face Area (sq. ft.) 2.7 2.7 2.7
Tube Size (in.) 0.81 0.81 1
Refrigeration Control EXPANSION VALVE
Drain Conn. Size (in.) 3/4 FEMALE NPT
OUTDOOR FAN — TYPE Swept
DIA. (IN.) 23.4
DRIVE/NO. SPEEDS DIRECT / 1
CFM @ 0.0 in. w.g. (f) 2350 2800 3080
Motor — HP/R.P.M 1/12 / 810 1/6 / 825 1/5 /825
Volts/Ph/Hz 208–230/1/60
F.L. Amps/L.R Amps LOCATED ON UNIT NAMEPLATE
INDOOR FAN — TYPE Const. Torque ECM
Dia. x Width (in.) 10.62 x 10.62
Drive/No. Speeds DIRECT / 4
CFM @ 0.0 in. w.g. (g) SEE FAN PERFORMANCE TABLE
Motor — HP / R.P.M. 1/3 / 1050 1/2 / 1050 3/4 / 1050
Volts/Ph/Hz 208–230/1/60
COMBUSTION FAN-TYPE Centrifugal
Drive / no. Speeds Direct 1
Motor- HP / R.P.M. 1/34 /3345 1/34 /3290 1/34 /3290
F.L. Amps LOCATED ON UNIT NAMEPLATE
FILTER / FURNISHED NO
Type Recommended THROWAWAY
Recmd. Face Area (sq. ft) (h) 4.0 4.0 4.0
REFRIGERANT R-410
Charge (lbs.) LOCATED ON UNIT NAMEPLATE
Subcooling 10° 8° 11°
(a) Rated in accordance with AHRI Standard 210/240. AHRI standard rating conditions are: 80 D.B.67 W.B. entering air to indoor coil. 95 D. B. entering air to
outdoor coil.
(b) Sound Power values are not adjusted for AHRI 270–95 tonal corrections.
(c) Ratings shown are for elevations up to 2000 ft. For higher elevations reduce ratings at a rate of 4% per 1000 ft. elevation.
(d) Convertible to LPG.
(e) This value is approximate. For more precise value, see Unit Nameplate.
(f) Standard Air — Dry Coil — Outdoor.
(g) Based on U.S. Government Standard Tests.
(h) Filters must be installed in return air stream. Square footages listed are based on 300 f.p.m. face velocity. If permanent filters are used size per
manufacturer’s recommendation with a clean resistance of 0.05” W.C.
IInnttrroodduuccttiioonn,, UUnniitt IInnssppeeccttiioonn aanndd SSppeecciiffiiccaattiioonn

618-EB40D1-1E-EN
MODEL 4YCC4042*1060
[4YCC4042*1090]
4YCC4048*1070
[4YCC4048*1090]
4YCC4060A*1090
[4YCC4060A*1115]
RATED Volts/PH/Hz 208–230/1/60
Performance Cooling BTUH (a) 39500 46000 57000
Indoor Airflow (CFM) 1450 1625 1770
Power Input (KW) LOCATED ON UNIT NAMEPLATE
EER2/SEER2 BTU/Watt-Hr 11.00 / 13.40 10.80 / 13.40 11.00 / 13.40
Sound Power Rating [dB(A)] (b) 74.6 72.5 73.1
PERFORMANCE HEATING(c)
Input BTUH-1st Stage (Natural Gas) (d) LOCATED ON UNIT NAMEPLATE
AFUE 81
Temp. Rise -min/max (°F) 30/60 [35/65] 30/60 [35/65] 30 / 60
Orifice Qty/drill size (Nat Gas) 2 / #33 [3 / #37] 2 / #33 [3 / #37] 3 / #37 [3 / #33]
POWER CONN. — V/Ph/Hz 208–230/1/60
Min. Brch. Cir. Ampacity (e) LOCATED ON UNIT NAMEPLATE
Fuse Size — Max. (amps) LOCATED ON UNIT NAMEPLATE
Fuse Size — Recmd. (amps) LOCATED ON UNIT NAMEPLATE
COMPRESSOR SCROLL
VOLTS/PH/HZ 208–230/1/60
R.L. Amps — L.R. Amps LOCATED ON UNIT NAMEPLATE
OUTDOOR COIL — TYPE SPINE FIN
Rows/F.P.I 2 / 24
Face Area (sq. ft.) 15.6 20.5 23.0
Tube Size (in.) 3/8
INDOOR COIL — TYPE MCHE Plate Fin
Rows/F.P.I 2 / 16 2 / 16 4 / 15
Face Area (sq. ft.) 3.9 3.9 5.0
Tube Size (in.) 0.81 0.81 3/8
Refrigeration Control EXPANSION VALVE
Drain Conn. Size (in.) 3/4 FEMALE NPT
OUTDOOR FAN — TYPE Swept
DIA. (IN.) 28.5
DRIVE/NO. SPEEDS DIRECT / 1
CFM @ 0.0 in. w.g. (f) 3400 4800 4800
Motor — HP/R.P.M 1/4 / 825 1/4 / 825 1/3/825
Volts/Ph/Hz 208–230/1/60
F.L. Amps/L.R Amps LOCATED ON UNIT NAMEPLATE
INDOOR FAN — TYPE Const. Torque ECM
Dia. x Width (in.) 10.62 x 10.62 11.87 x 10.68
Drive/No. Speeds DIRECT / 4 DIRECT / 5 DIRECT / 4
CFM @ 0.0 in. w.g. (g) SEE FAN PERFORMANCE TABLE
Motor — HP / R.P.M. 3/4 /1050 3/4 /1050 1 / 1050
Volts/Ph/Hz 208–230/1/60
COMBUSTION FAN-TYPE Centrifugal
Drive / no. Speeds Direct 1
Motor- HP / R.P.M. 1/34 / 3345 1/34 /3290 1/34 / 3075 [1 /34 / 3055]
F.L. Amps LOCATED ON UNIT NAMEPLATE
FILTER / FURNISHED NO
Type Recommended THROWAWAY
Recmd. Face Area (sq. ft) (h) 5.3 5.3 5.3
REFRIGERANT R-410
Charge (lbs.) LOCATED ON UNIT NAMEPLATE
Subcooling 10° 10° 11°
(a) Rated in accordance with AHRI Standard 210/240. AHRI standard rating conditions are: 80 D.B.67 W.B. entering air to indoor coil. 95 D. B. entering air to
outdoor coil.
(b) Sound Power values are not adjusted for AHRI 270–95 tonal corrections.
(c) Ratings shown are for elevations up to 2000 ft. For higher elevations reduce ratings at a rate of 4% per 1000 ft. elevation.
(d) Convertible to LPG.
(e) This value is approximate. For more precise value, see Unit Nameplate.
(f) Standard Air — Dry Coil — Outdoor.
(g) Based on U.S. Government Standard Tests.
(h) Filters must be installed in return air stream. Square footages listed are based on 300 f.p.m. face velocity. If permanent filters are used size per
manufacturer’s recommendation with a clean resistance of 0.05” W.C.
IInnttrroodduuccttiioonn,, UUnniitt IInnssppeeccttiioonn aanndd SSppeecciiffiiccaattiioonn

18-EB40D1-1E-EN 7
Charging in Cooling above
55°F OD Ambient
If servicing the equipment requires system evacuation,
then re-charge the system to the weight specified on
the nameplate Verify the system subcooling using the
Subcooling Charging Table and, if necessary, adjust
the charge using the procedure below
1 For best results — the indoor temperature should
be kept between 70°F to 80°F Add system heat if
needed
2 Whenever charge is removed or added, the system
must be operated for a minimum of 20 minutes to
stabilize before accurate measurements can be
made
3 Measure Liquid Line Temperature and Refrigerant
Pressure at service valved in the compressor
compartment
4 Locate your liquid line temperature in the left
column of the table, and the intersecting liquid line
pressure under the subcool value column, Add
refrigerant to raise the pressure to match the table,
or remove refrigerant to lower the pressure Again,
wait 20 minutes for the system conditions to
stabilize before adjusting charge again
NNoottee:: System charge shall never be more than 110% or
less than 90% of nameplate charge. If specified
subcooling cannot be achieved within those
charge bounds, contact your Field Service
Representative.
5 When system is correctly charged, you can refer to
System Pressure Curves to verify typical
performance
CCHHAARRGGIINNGG BBEELLOOWW 5555°°FF
Evacuate system and weigh in nameplate charge or
use factory charge Correct subcooling may be verified
when the temperature is above 55°F
R-410A REFRIGERANT CHARGING CHART
Refer to Service Facts or Installer’s Guide for charging method
LIQUID
TEMP
(°F)
DESIGN SUBCOOLING (°F)
6 8 9 10 11 12 13 14 16
LIQUID GAGE PRESSURE (PSI)
55 174 179 182 185 188 191 195 198 205
60 189 195 198 201 204 208 211 215 222
65 205 211 215 218 222 225 229 232 240
70 222 229 232 236 240 243 247 251 259
75 240 247 251 255 259 263 267 271 279
80 259 267 271 275 279 283 287 291 301
85 279 287 291 296 300 304 309 313 323
90 301 309 313 318 322 327 331 336 347
95 323 331 336 341 346 351 355 360 371
100 347 355 360 365 370 376 381 386 398
105 371 381 386 391 396 402 407 413 425
110 398 407 413 418 424 429 435 441 454
115 425 435 441 446 452 458 464 470 484
120 454 464 470 476 482 488 495 501 516
125 484 495 501 507 514 520 527 533 549
From Dwg. D154557P01
IInnttrroodduuccttiioonn,, UUnniitt IInnssppeeccttiioonn aanndd SSppeecciiffiiccaattiioonn

818-EB40D1-1E-EN
Determine Unit Clearances
Figure 1. Space on Sides Requirements
Note: The view labeled “Bottom side”
represents the base as viewed looking
up from underneath the unit.
W/ ECONOMIZER W/ ECONOMIZER
BACK SIDE 305 [12] 762 [30] 305 [12] 762 [30]
LEFT SIDE 762 [30] 914 [36] 914 [36] 1067 [42]
RIGHT SIDE 610 [24] - 610 [24] -
FRONT SIDE 1067 [42] - 762 [30] -
BOTTOM
BACK SIDE
LEFT SIDE
RIGHT SIDE
FRONT SIDE
TOP
A HEIGHT OF UNIT - TABLE NEXT PAGE
BB CENTER OF GRAVITY - TABLE NEXT PAGE
CC CENTER OF GRAVITY - TABLE NEXT PAGE
DD -Depth
EE -Width
FF
25 [1]
0
25 [1]
DIMENSIONS mm [Inches]
2 - 3 TON Units 3.5 - 5 TON Units
RECOMMENDED SERVICE CLEARANCE mm [Inches]
CLEARANCE TO COMBUSTIBLE MATERIAL mm [Inches]
0
2 - 3 TON 3.5 - 5 TON
152 [6]
152 [6]
305 [12]
914 [36]
1049.02 [41-5/16]
1240.28 [48.27-27/32]
152 [6]
152 [6]
305 [12]
914 [36]
475.23 [18-23/32]
1125.22 [44-5/16]
1487.17 [58-9/16]
551.43 [21-23/32]
FF
DD
EE

18-EB40D1-1E-EN 9
Figure 2. Bottom and Back Duct Openings
B C D E F G H I J K L M N
4YCC4024
4YCC4030
4YCC4036
4YCC4042
4YCC4048
4YCC4060
PHYSICAL DIMENSIONS mm[In]
304.80
[12]
75.41
[2.93]
75.41
[2.93]
406.40
[16]
167.89
[6.61]
173.46
[6-27/32]
304.80
[12]
79.50
[3.13]
398.22
[15.68]
176.07
[6.93]
177.55
[6.99]
296.62
[11.68]
1155.45
[45.49]
457.20
[18]
75.41
[2.97]
75.41
[2.97]
381.00
[15]
322.84
[12.71]
372.82
[14.68]
1402.34
[55.21]
244.09
[9.61]
318.75
[12.55]
381.00
[15]
79.50
[3.13]
449.02
[17.68]
176.07
[6.93]
W1 W2 W3 W4 BB CC
4YCC4024* (060) 58 [129] 37 [81] 26 [58] 41 [90] 196 [432] 162 [358] 480 [19] 528 [21]
4YCC4030* (070) 61 [135] 39 [85]
28 [61] 43 [95] 205 [451] 171 [377] 407 [16] 594 [23]
4YCC4036* (070) 61 [134] 39 [84]
28 [60] 43 [95] 205 [438] 171 [374] 407 [16] 594 [28]
4YCC4036* (090) 61 [136] 39 [86]
4YCC4042*(060) 71 [157] 47 [103] 35 [76] 53 [117] 252 [555] 202 [202] 470 [19] 731 [29]
4YCC4042*(090) 72 [158] 47 [104] 35 [78] 54 [118] 255 [561] 207 [202] 470 [19] 731 [29]
4YCC4048*(070) 71 [157] 45 [98] 33 [73] 54 [119] 250 [552] 202 [448] 433 [17] 743 [29]
4YCC4048*(090) 72 [159] 45 [99] 34 [75] 55 [120] 253 [557] 205 [453] 433 [17] 743 [29]
4YCC4060*(090) 77 [170] 46 [101] 35 [76] 58 [128] 263 [580] 216 [476] 433 [17] 743 [29]
4YCC4060*(115) 78 [172] 46 [102] 35 [77] 59 [130] 266 [586] 219 [482] 414 [16] 635 [25]
Corner Weights KG/LBS
SHIPPING
WEIGHT
KG/LBS
UNIT
WEIGHT
KG/LBS
Center Of Gravity m m [inch]
I
J
J
L
M
G
B
E
DF
E
C
K
H
HEIGHT-A
mm[inch]
898.53 [35-3/8]
949.33 [37-3/8]
898.53 [35-3/8]
1000.13 [35-3/8]
N
28 [61] 43 [96] 205 [453] 171 [379] 407 [16] 594 [28]
DDeetteerrmmiinnee UUnniitt CClleeaarraanncceess

10 18-EB40D1-1E-EN
Review Location and Recommendation nformation
NNootteess::
• The unit is shipped for horizontal installation.
• During heating operation, avoid supply air
below 80 degrees F or return air below 50
degrees F to prevent flue gas condensation.
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 The louvers above and below the flue hood in the
side panel must have adequate clearance around
the air opening into the combustion area
4 Examine all flue product-carrying areas of the
furnace, its vent system, and the main burner for
safe operation
IImmppoorrttaanntt:: A minimum clearance of 0.0” to
combustible material shall be
maintained on air outlet duct.
5 Exhaust vents or other sources of contaminated air
must not be near the unit’s air inlet if outside air is
to be introduced as make-up air or a ventilation
feature is to be used Contamination from exhaust
vents or chimneys may also foul the condenser
causing degraded performance
6 Check the handling facilities to ensure the safety of
personnel and the unit(s)
7 The unit must be mounted level for proper drainage
of water through the drain holes in the base pan
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 Holes through exterior walls or roof must be sealed
in accordance with local codes
11 All fabricated outdoor ducts should be as short as
possible
CClleeaarraanncceess
1 The recommended clearances for single-unit
installations are illustrated in “ Determine Unit
Clearances,” p 8
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
(BAYCURB050A or BAYCURB051A) 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 The louvers above and below the flue hood in the
side panel must have adequate clearance around
the air opening into the combustion area
10 Examine all flue product-carrying areas of the
furnace, its vent system, and the main burner for
safe operation
IImmppoorrttaanntt:: A minimum clearance of 0.0” to
combustible material shall be maintained
on air outlet duct.

18-EB40D1-1E-EN 11
11 Exhaust vents or other sources of contaminated air
should not be near the unit’s air inlet if outside air is
to be introduced as make-up air or a ventilation
feature is to be used Contamination from exhaust
vents or chimneys may also foul the condenser
causing degraded performance
12 Check the handling facilities to ensure the safety of
personnel and the unit(s)
13 Manufacturer allows the use of the furnace during
the finishing stages of construction, given the
workspace is substantially free of debris and dust;
interior drywall installation shall be completed and
covered with paint or primer; proper vent
installation; furnace shall be set up to operate in
accordance with the manufacturer’s shipped
installation instructions and shall be verified for
operating conditions including ignition, input rate,
temperature rise, and venting
CClleeaarraanncceess
1 The recommended clearances for single-unit
installations are illustrated in “ Determine Unit
Clearances,” p 8
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
4 The vent of this unit must not terminate above
grade, veranda, porch, deck, or balcony within 12”
(30 cm); Clearance to window or door that can be
opened minimum distance 12” (30 cm); Clearance
to any permanently closed window follow Install
manual Instructions Hot gases leaving the unit vent
can affect all construction materials and must be
evaluated by installer
RReevviieeww LLooccaattiioonn aanndd RReeccoommmmeennddaattiioonn IInnffoorrmmaattiioonn

12 18-EB40D1-1E-EN
Unit nstallation
NNoottee:: The factory ships this unit for horizontal
installation.
nstall Flue Hood
1 Locate the Flue Hood in the literature package
2 Remove the two Flue Hood mounting screws from
the unit They are located to the right of the Power
Entry connection panel
3 Attach the Flue Hood to the unit with the two
screws removed in step two
Ground Level nstallation
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 Usage of the
extreme mounting kit accessories is a
recommendation, not a requirement
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 As
indicated in Table 3, p 14, vibration support is a
recommendation, not a requirement
2 The louvers above and below the Flue Hood in the
side panel must have adequate clearance around
the air opening into the combustion area
3 Location of the unit must allow service clearance
around it Clearance of the unit must be given
careful consideration See “ Determine Unit
Clearances,” p 8
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.
IImmppoorrttaanntt:: A minimum clearance of 0.0" to
combustible material shall be maintained
on air outlet duct.
4 Attach the supply and return air ducts to the unit as
explained in the Ductwork Installation section
5 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
6 Do not expose the unit to direct roof water runoff
7 Seal all holes through exterior walls in accordance
with local codes
8 Continue with the following installation sections to
complete the installation: Ductwork, Gas Piping,
Filter and Electrical Wiring
Rooftop nstallation—Curb
Mounting
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:
• 4YCC4024–036 use model BAYCURB050A
• 4YCC4042–060 use model BAYCURB051A
2 Assemble and install the curb following the
instructions in the Installer's Guide included with
the appropriate curb

18-EB40D1-1E-EN 13
Table 1. Typical Ground Level Application
Note: Use 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
3/4” VIBRATION ISOLATORS, USE
7 ISOLATORS
Table 2. Converting Horizontal to Down Airflow
Lifting and Rigging
WWAARRNNIINNGG
IIMMPPRROOPPEERR UUNNIITT LLIIFFTT!!
FFaaiilluurree ttoo pprrooppeerrllyy lliifftt uunniitt ccoouulldd rreessuulltt iinn ddeeaatthh oorr
sseerriioouuss iinnjjuurryy oorr ppoossssiibbllee eeqquuiippmmeenntt oorr pprrooppeerrttyy--
oonnllyy ddaammaaggee
TTeesstt lliifftt uunniitt aapppprrooxxiimmaatteellyy 2244 iinncchheess ttoo vveerriiffyy
pprrooppeerr cceenntteerr ooff ggrraavviittyy lliifftt ppooiinntt TToo aavvooiidd
ddrrooppppiinngg ooff uunniitt,, rreeppoossiittiioonn lliiffttiinngg ppooiinntt iiff uunniitt iiss
nnoott lleevveell
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 (“ Determine Unit Clearances,” p 8)
Because of placement of internal components, the
unit’s weight may be unevenly distributed
Approximate unit weights are also provided in the
unit drawings
UUnniitt IInnssttaallllaattiioonn

14 18-EB40D1-1E-EN
NNoottee:: nit rigging and hoisting requires accessory
kit BAYLIFT002BA. 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.
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, see Table 4, p 15
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 Consider using the extreme
mounting kit, BAYEXMK001A, to add additional
hold down strength to the mounting
NNootteess::
• For rooftop applications, the use of extreme
mounting kits and vibration isolators is
optional and not mandatory.
• The ductwork is installed as part of the curb
installation. Do not attach ductwork to the
unit and lower the unit with ductwork onto
the curb.
Table 3. Vibration solators/Snow Feet Locations
Note: The installation instructions indicate typical installation only, but actual installation may differ.
Note: These views represent the base as
viewed looking up from underneath
the unit.
Important: Unit vibration isolator support
is recommended in the general
areas shown. Locate 3/4" thick
vibration isolators on the
bottom of the basepan as
illustrated by black dots for
ground level pad applications.
Modify vibration isolator
location as necessary for frame
and rail applications.
Small Cabinet
****4024 - 4036
Medium Cabinet
****4042 - 4060
Rooftop nstallation — Frame
Mounting
For rooftop applications using field fabricated frame
and ducts use the following procedure:
1 Locate and secure the frame to the roof by bolting
or welding Frame must provide adequate center
support via a cross member centrally located
channel rail See Table 7, p 17 Vibration isolators
should be installed as indicated in Table 3, p 14,
adjust as necessary for your frame 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 frame
UUnniitt IInnssttaallllaattiioonn

18-EB40D1-1E-EN 15
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 frame
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 The unit should not be exposed 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 “ Determine Unit
Clearances,” p 8 provide unit dimensions
12 Continue with the following installation sections to
complete the installation: Ductwork, Filter, and
Electrical Wiring
Rooftop nstallation — No Curb/
Frame
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 “ Determine Unit
Clearances,” p 8 provide unit dimensions
12 Continue with the following installation sections:
Ductwork, Filter and Electrical Wiring
Table 4. 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
UUnniitt IInnssttaallllaattiioonn

16 18-EB40D1-1E-EN
Table 5. Curb Dimensions
This drawing was prepared by the manufacturer in order to provide detail regarding job layout only. This drawing is not intended to be used as a
basis to construct, build or modify the item depicted in the drawing. The manufacturer is not responsible for the unauthorized use of this
drawing and expressly disclaims any liability for damages resulting from such unauthorized use.
Table 6. 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
UUnniitt IInnssttaallllaattiioonn

18-EB40D1-1E-EN 17
Table 7. 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
Ductwork nstallation
Attaching Downflow Ductwork to Roof
Curb
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
Attaching Downflow Ductwork to Roof
Frame
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 3. 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
UUnniitt IInnssttaallllaattiioonn

18 18-EB40D1-1E-EN
Attaching Horizontal Ductwork to Unit
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 4. Attaching Horizontal Airflow Ductwork
FIELD DUCT
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
FIELD DUCT
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
Condensate Drain Piping
A 3/4-inch female NPT condensate drain connection is
provided on the evaporator access panel end of the
unit Provide a trap and fill it with water before starting
the unit to avoid air from being drawn through 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
5, p 18
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 5. Typical Condensate Drain Piping
3/4" PVC OR COPPER
TUBING AND FITTINGS
1-1/2" MIN.
1-1/2" MIN.
Gas Piping nstallation
WWAARRNNIINNGG
FFIIRREE OORR EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhee ssaaffeettyy wwaarrnniinngg eexxaaccttllyy ccoouulldd
rreessuulltt iinn sseerriioouuss iinnjjuurryy,, ddeeaatthh,, oorr pprrooppeerrttyy
ddaammaaggee
UUssee aa ccoommmmeerrcciiaallllyy aavvaaiillaabbllee ssooaapp ssoolluuttiioonn mmaaddee
ssppeecciiffiiccaallllyy ffoorr tthhee ddeetteeccttiioonn ooff lleeaakkss ttoo cchheecckk aallll
ccoonnnneeccttiioonnss
IImmppoorrttaanntt:: Before making the gas pipe connection,
give serious consideration to providing the
clearance necessary to remove the access
panels on the unit (e.g., economizer and
filter access panels).
NNoottee:: In the absence of local codes, the installation
must conform with American National Standard–
Z223.1–National Fuel Gas Code, Latest Revision.
The available gas supply must agree with the required
gas supply marked on the unit nameplate Minimum
permissible gas supply pressure for purpose of input
adjustment must be at least 7 0 in w c (inches water
column) for natural gas and 11 in w c for LP Gas
PPiippee DDeelliivveerryy SScchheedduullee
NNoottee:: The following procedure and tables apply to
Natural Gas oonnllyy.
1 Obtain from the gas company the heating value and
specific gravity of the gas delivered
2 Determine the exact length of pipe needed
3 Read BTUH input nameplate on the furnace
4 Use the multiplier opposite the specific gravity of
the gas given in Multiplier Table and insert in the
following formula:
5 Use the Natural Gas Only table and select the pipe
length nearest to calculated size
Furnace Input in BTUH
Gas Heat Contne in BTU/Cu. Ft. X Multiplier
CFH =
6 Follow this line vertically down to the exact CFH
found in Step 4 above or the next highest value
7 Read horizontally to the left of this column for the
required pipe size diameter
Table 8. Specific Gravity Multiplier
SPECIFIC
GRAVITY MULTIPLIER
MULTIPLIERS TO BE USED
WHEN THE SPECIFIC GRAVITY
OF THE GAS IS OTHER THAN
0.060
.50 1.10
.55 1.04
.60 1.00
.65 .962
NNoottee:: If this is an LP Gas application, consult your LP
Gas supplier for pipe sizes and deliveries.
UUnniitt IInnssttaallllaattiioonn

18-EB40D1-1E-EN 19
Table 9. Natural Gas Only
TABLE OF CUBIC FEET PER HOUR OF GAS FOR VARIOUS
PIPE SIZES AND LENGTHS
PIPE
SIZE
(inch) 10 20 30 40 50 60 70
1/2 132 92 73 63 56 50 46
3/4 278 190 152 130 115 105 96
1 520 350 285 245 215 195 180
1–1/4 1050 730 590 520 440 400 370
THIS TABLE IS BASED ON PRESSURE DROP OF 0.3 INCH W.C.
AND 0.6 SP.GR. GAS
GGaass PPrreessssuurree SSeett--uupp PPrreeccaauuttiioonnss
IImmppoorrttaanntt:: Do not connect gas piping to the unit until a
line pressure test has been completed. This
unit should never be exposed to gas line
pressure in excess of 14 inches water
column (1/2 PSIG). The furnace and its
equipment shutoff valve must be
disconnected from the gas supply piping
system during any pressure testing of that
system at test pressures in excess of 1/2
psi.
The furnace must be isolated from the gas supply
piping system by closing its individual manual shut-off
valve during any pressure testing of the gas supply
piping system at test pressures less than or equal to 1/2
psig (3 48 kPa)
GGaass SSuuppppllyy LLiinnee PPrreessssuurree
Before connecting the unit to the gas supply line, be
sure to determine the gas pressure in the line
If the gas supply pressure is excessive (above 14 inches
water column or 1/2 psig), install a pressure regulator
either at the supply source or in the branch circuit
serving the unit Once the regulator is installed, set it to
provide a pressure of 7 inches water column with the
unit operating and no greater than 14 inches water
column with the unit not firing
NNoottee:: Gas pressure in excess of 14 inches water
column (1/2 psig) may damage the regulator,
while improper regulation may result at
pressures lower than 5.5 inches water column at
the unit inlet.
If the supply line pressure is below the minimum
supply pressure indicated on the unit nameplate,
contact the gas supply company
Follow these steps to complete the installation of the
unit gas piping See Table 10, p 19
NNoottee:: The shut-off gas cock must be installed outside
of the unit and should meet the specifications of
all applicable national and local codes.
Table 10. Gas Pipe
DEALER INSTALLED
GROUND UNION
1/8" N.P.T.PLUGGED
ACCESS FOR TEST
GAUGE CONNECTION
FROM
GAS SUPPLY
FIELD SUPPLIED MAIN
GAS VALVE, MUST BE
INSTALLED BY DEALER
OUTSIDE OF UNIT.
UNIT
TO MAIN
CONTROL
VALVE
6"
MIN
DRIP LEG
(6" MIN)
1 Install a ground union joint downstream of the
shut-off cock This joint must also be installed
outside of the unit
2 Install a drip leg at least six (6) inches in depth next
to the union as shown in This drip leg is required
to collect any sediment that may be deposited in
the line
3 Before connecting the piping circuit to the unit,
bleed the air from the supply line and then cap or
plug the line and test the pressure at the tapped
shut-off cock The pressure reading should not
exceed 13 8 inches water column
4 Using an appropriate backup wrench on the gas
valve inlet boss, connect the gas piping to the unit
Check the completed piping for leaks using a soap
and water solution or the equivalent
5 After installation of the gas pipe in the unit, the pipe
opening should be closed with the filler/barrier plug
provided
VVeerriiffyy MMaanniiffoolldd PPrreessssuurree
Check the manifold pressure at the unit gas valve Do
not exceed the recommended pressure shown on the
unit nameplate See Figure 6, p 20 for connections
Refer to Manifold Pressure Check and Adjust in the
following Step 5-Unit Startup section if adjustment is
needed
IInnppuutt CChheecckk aanndd AAddjjuussttmmeenntt
1 Make sure all gas appliances are off except the
furnace
2 Clock the gas meter with the furnace operating
(determine the dial rating of the meter) for one
revolution
3 Match the “Sec” column in the Gas Flow (in cfh)
Table 11, p 20 with the time clocked
4 Read the “Flow” column opposite the number of
seconds clocked
5 Table 11, p 20 lists values for a 2 cubic foot dial
For 1, 1/2, or 5 Cu Ft dials use the following
conversions:
UUnniitt IInnssttaallllaattiioonn

20 18-EB40D1-1E-EN
• 1 Cu Ft Dial Gas Flow CFH = Chart Flow
Reading / 2
• 1/2 Cu Ft Dial Gas Flow CFH = Chart Flow
Reading / 4
• 5 Cu Ft Dial Gas Flow CFH = 10X Chart Flow
Reading / 4
6 Multiply the final figure by the heating value of the
gas obtained from the utility company and compare
to the nameplate rating This must not exceed the
nameplate rating
7 Changes can be made by adjusting the manifold
pressure
a Attach a manifold pressure gauge to the Outlet
Pressure Tap
b Remove the cover screw on top of the gas valve
to access the manifold pressure adjustment
screw
c Turn the adjustment screw in to increase the
gas flow rate, and out to decrease the gas flow
rate using a 3/32" hex wrench or flat-head
screwdriver
NNoottee:: For manifold pressures and orifice sizes for gas
with other BT ratings, contact the local gas
utility. Manifold pressure should be 3.5 inches
water column (+ 0.1). Input for natural gas must
nnoott exceed the value shown on the rating plate.
Figure 6. Burner and Valve
Regulator Cover Screw
(Adj. screw beneath
this screw)
Manual
On-Off
Switch
Inlet
Pressure
Tap
Vent Post
Outlet
Pressure Tap
REF. VIEW
(GAS VALVE)
Orifice
Burner
Manifold
Gas Valve
REF. VIEW
(3 Burners)
Table 11. Gas Flow (in cfh)
Sec. Flow Sec. Flow Sec. Flow Sec. Flow
8 900 29 248 50 144 82 88
9 800 30 240 51 141 84 86
10 720 31 232 52 138 86 84
11 655 32 225 53 136 88 82
12 600 33 218 54 133 90 80
13 555 34 212 55 131 92 78
14 514 35 206 56 129 94 76
15 480 36 200 57 126 96 75
16 450 37 195 58 124 98 73
17 424 38 189 59 122 100 72
18 400 39 185 60 120 104 69
19 379 40 180 62 116 108 67
20 360 41 176 64 112 112 64
Table 11. Gas Flow (in cfh) (continued)
Sec. Flow Sec. Flow Sec. Flow Sec. Flow
21 343 42 172 66 109 116 62
22 327 43 167 68 106 120 60
23 313 44 164 70 103 124 58
24 300 45 160 72 100 128 56
25 288 46 157 74 97 132 54
26 277 47 153 76 95 136 53
27 267 48 150 78 92 140 51
28 257 49 147 80 90 144 50
UUnniitt IInnssttaallllaattiioonn