Trane GRAA Installation and operating 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
August 2020 MMUUAA--SSVVXX000044BB--EENN
Installation, Operation, and Maintenance
Outdoor Rooftop Gas-Fired Duct
Furnace
Natural or Power Vented
MMooddeellss::
GRAA
GRBA
GRCA
GRDA
GFAA
GFBA
GFCA
GFDA

©2020 Trane MUA-SVX004B-EN
Introduction
Read this manual thoroughly before operating or servicing this unit
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as required Your personal safety and the
proper operation of this machine depend upon the strict observance of these precautions
The three types of advisories are defined as follows:
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAU TION
Indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury. It could also be used to alert against unsafe practices.
NOTICE
Indicates a situation that could result in equipment or property-damage only
accidents.
Important Environmental Concerns
Scientific research has shown that certain man-made chemicals can affect the earth’s naturally
occurring stratospheric ozone layer when released to the atmosphere In particular, several of the
identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine,
Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon
(HCFCs) Not all refrigerants containing these compounds have the same potential impact to the
environment Trane advocates the responsible handling of all refrigerants-including industry
replacements for CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs
Important Responsible Refrigerant Practices
Trane believes that responsible refrigerant practices are important to the environment, our
customers, and the air conditioning industry All technicians who handle refrigerants must be
certified The Federal Clean Air Act (Section 608) sets forth the requirements for handling,
reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in
these service procedures In addition, some states or municipalities may have additional
requirements that must also be adhered to for responsible management of refrigerants Know
the applicable laws and follow them
WWAARRNNIINNGG
PPrrooppeerr FFiieelldd WWiirriinngg aanndd GGrroouunnddiinngg RReeqquuiirreedd!!
FFaaiilluurree ttoo ffoollllooww ccooddee ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy
AAllll ffiieelldd wwiirriinngg MMUUSSTT bbee ppeerrffoorrmmeedd bbyy qquuaalliiffiieedd ppeerrssoonnnneell IImmpprrooppeerrllyy iinnssttaalllleedd aanndd
ggrroouunnddeedd ffiieelldd wwiirriinngg ppoosseess FFIIRREE aanndd EELLEECCTTRROOCCUUTTIIOONN hhaazzaarrddss TToo aavvooiidd tthheessee hhaazzaarrddss,,
yyoouu MMUUSSTT ffoollllooww rreeqquuiirreemmeennttss ffoorr ffiieelldd wwiirriinngg iinnssttaallllaattiioonn aanndd ggrroouunnddiinngg aass ddeessccrriibbeedd iinn
NNEECC aanndd yyoouurr llooccaall//ssttaattee//nnaattiioonnaall eelleeccttrriiccaall ccooddeess

MUA-SVX004B-EN 3
WWAARRNNIINNGG
PPeerrssoonnaall PPrrootteeccttiivvee EEqquuiippmmeenntt ((PPPPEE)) RReeqquuiirreedd!!
FFaaiilluurree ttoo wweeaarr pprrooppeerr PPPPEE ffoorr tthhee jjoobb bbeeiinngg uunnddeerrttaakkeenn ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss
iinnjjuurryy
TTeecchhnniicciiaannss,, iinn oorrddeerr ttoo pprrootteecctt tthheemmsseellvveess ffrroomm ppootteennttiiaall eelleeccttrriiccaall,, mmeecchhaanniiccaall,, aanndd
cchheemmiiccaall hhaazzaarrddss,, MMUUSSTT ffoollllooww pprreeccaauuttiioonnss iinn tthhiiss mmaannuuaall aanndd oonn tthhee ttaaggss,, ssttiicckkeerrss,, aanndd
llaabbeellss,, aass wweellll aass tthhee iinnssttrruuccttiioonnss bbeellooww::
•• BBeeffoorree iinnssttaalllliinngg//sseerrvviicciinngg tthhiiss uunniitt,, tteecchhnniicciiaannss MMUUSSTT ppuutt oonn aallll PPPPEE rreeqquuiirreedd ffoorr
tthhee wwoorrkk bbeeiinngg uunnddeerrttaakkeenn ((EExxaammpplleess;; ccuutt rreessiissttaanntt gglloovveess//sslleeeevveess,, bbuuttyyll gglloovveess,,
ssaaffeettyy ggllaasssseess,, hhaarrdd hhaatt//bbuummpp ccaapp,, ffaallll pprrootteeccttiioonn,, eelleeccttrriiccaall PPPPEE aanndd aarrcc ffllaasshh
ccllootthhiinngg)) AALLWWAAYYSS rreeffeerr ttoo aapppprroopprriiaattee SSaaffeettyy DDaattaa SShheeeettss ((SSDDSS)) aanndd OOSSHHAA
gguuiiddeelliinneess ffoorr pprrooppeerr PPPPEE
•• WWhheenn wwoorrkkiinngg wwiitthh oorr aarroouunndd hhaazzaarrddoouuss cchheemmiiccaallss,, AALLWWAAYYSS rreeffeerr ttoo tthhee
aapppprroopprriiaattee SSDDSS aanndd OOSSHHAA//GGHHSS ((GGlloobbaall HHaarrmmoonniizzeedd SSyysstteemm ooff CCllaassssiiffiiccaattiioonn aanndd
LLaabbeelllliinngg ooff CChheemmiiccaallss)) gguuiiddeelliinneess ffoorr iinnffoorrmmaattiioonn oonn aalllloowwaabbllee ppeerrssoonnaall eexxppoossuurree
lleevveellss,, pprrooppeerr rreessppiirraattoorryy pprrootteeccttiioonn aanndd hhaannddlliinngg iinnssttrruuccttiioonnss
•• IIff tthheerree iiss aa rriisskk ooff eenneerrggiizzeedd eelleeccttrriiccaall ccoonnttaacctt,, aarrcc,, oorr ffllaasshh,, tteecchhnniicciiaannss MMUUSSTT ppuutt
oonn aallll PPPPEE iinn aaccccoorrddaannccee wwiitthh OOSSHHAA,, NNFFPPAA 7700EE,, oorr ootthheerr ccoouunnttrryy--ssppeecciiffiicc
rreeqquuiirreemmeennttss ffoorr aarrcc ffllaasshh pprrootteeccttiioonn,, PPRRIIOORR ttoo sseerrvviicciinngg tthhee uunniitt NNEEVVEERR PPEERRFFOORRMM
AANNYY SSWWIITTCCHHIINNGG,, DDIISSCCOONNNNEECCTTIINNGG,, OORR VVOOLLTTAAGGEE TTEESSTTIINNGG WWIITTHHOOUUTT PPRROOPPEERR
EELLEECCTTRRIICCAALL PPPPEE AANNDD AARRCC FFLLAASSHH CCLLOOTTHHIINNGG EENNSSUURREE EELLEECCTTRRIICCAALL MMEETTEERRSS AANNDD
EEQQUUIIPPMMEENNTT AARREE PPRROOPPEERRLLYY RRAATTEEDD FFOORR IINNTTEENNDDEEDD VVOOLLTTAAGGEE
WWAARRNNIINNGG
TTooxxiicc FFuummeess aanndd FFiibbeerrss!!
IInnssttaallll,, ooppeerraattee aanndd mmaaiinnttaaiinn uunniitt iinn aaccccoorrddaannccee wwiitthh mmaannuuffaaccttuurreerr''ss iinnssttrruuccttiioonnss ttoo aavvooiidd
eexxppoossuurree ttoo ffuueell ssuubbssttaanncceess oorr ssuubbssttaanncceess ffrroomm iinnccoommpplleettee ccoommbbuussttiioonn wwhhiicchh ccoouulldd
rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iillllnneessss TThhee SSttaattee ooff CCaalliiffoorrnniiaa hhaass ddeetteerrmmiinneedd tthhaatt tthheessee
ssuubbssttaanncceess mmaayy ccaauussee ccaanncceerr,, bbiirrtthh ddeeffeeccttss,, oorr ootthheerr rreepprroodduuccttiivvee hhaarrmm IInnssttaallll aanndd
SSeerrvviiccee tthhiiss pprroodduucctt ttoo aavvooiidd eexxppoossuurree ttoo aaiirrbboorrnnee ppaarrttiicclleess ooff ggllaasssswwooooll ffiibbeerrss aanndd//oorr
cceerraammiicc ffiibbeerrss kknnoowwnn ttoo tthhee SSttaattee ooff CCaalliiffoorrnniiaa ttoo ccaauussee ccaanncceerr tthhrroouugghh iinnhhaallaattiioonn
Cop right
This document and the information in it are the property of Trane, and may not be used or
reproduced in whole or in part without written permission Trane reserves the right to revise this
publication at any time, and to make changes to its content without obligation to notify any
person of such revision or change
Trademarks
All trademarks referenced in this document are the trademarks of their respective owners
IInnttrroodduuccttiioonn

4MUA-SVX004B-EN
Receiving Instructions 6
Pre-Installation Instructions 6
Rigging 6
Location 6
Mounting 6
General Safety Information 7
Specifications 9
Performance Data Curves 12
Bypass Sizing Information 14
Built On the Job (Not Furnished by Factory) 14
Use of Bypass Curves 14
Installation 15
Clearances 15
Venting 17
Field Installation Instructions 18
Duct Specifications 20
Gas Connections 21
Electrical Connections 25
Operation 26
General Information 26
Controls 28
Operating High Limit Control 28
Pilot Control 28
High Gas Line Pressure Regulator (Natural Gas Only) 28
Gas Controls 29
Single Stage Control 29
Two-Stage Control 29
Electronic Modulating Control 29
Air Distribution 31
Intermittent Fan Operation 31
Constant Fan Operation 31
Air Throughput 32
Table of Contents

MUA-SVX004B-EN 5
Air Filters (On Mated Air Moving Device) 32
Lighting 33
Primary Air Shutter Adjustment 35
Pilot Adjustment 36
Gas Input Adjustment 37
Meter Method of Checking Input 37
Manifold Pressure Method of Checking Input 37
Start-Up 38
Starting Unit In Heating Mode 38
Final Checkout 38
Maintenance 39
Troubleshooting 42
Gas Equipment Start-Up 46
TTaabbllee ooff CCoonntteennttss

6MUA-SVX004B-EN
Receiving Instructions
Inspect shipment immediately when received to determine if any damage has occurred to the
crate during shipment
After the unit has been uncrated, check for any visible damage to the unit Check motor position
and turn blower wheel to determine if damage has occurred to these critical parts If any damage
is found, the cosignee should sign the bill of lading indicating such damage and immediately file
claim for damage with transportation company
Pre-Installation Instructions
Installer Please Note: This equipment has been test fired and inspected It has been shipped free
from defects from our factory However, during shipment and installation, problems such as
loose wires, leaks or loose fasteners may occur It is the installer's responsibility to inspect and
correct any problems that may be found When the unit is received and uncrated, check the
external data plate and all labels on the unit for type of gas, electrical, and operational
specifications to confirm that these agree with those at point of installation
NNoottee:: It is the owner's responsibility to provide any scaffolding or other apparatus required to
perform emergency service or annual/periodic maintenance to this equipment.
Rigging
Rig the unit using either belt or cable slings Use spreader bar to protect the top of the unit when
it is lifted The furnace units are provided with two holes in the base rail on each side of the unit
Slide pipes beneath the unit through these holes and attach rigging to the pipes for lifting the
unit
Location
Before placing the rooftop unit in its permanent location, make certain that the roof is capable of
carrying the additional load of this equipment Check the shipping weights given in Chart 2 Refer
to Figures 1, 2 and 6 and charts 1 and 2 for adequate unit dimensions and required clearances
Mounting
The units are mounted on skids and are suitable for use on combustible flooring It is
recommended that the skids be mounted either on level solid planking or steel channels, but
never on a soft tar roof where the skids could sink and reduce the clearance between the bottom
panel and the roof Roofcurb kits for rooftop gas heating units are shipped knocked down A curb
kit contains (insulated) curb rails, hardware, sealant, self-adhering rubber gasketing, and
installation instructions Roof insulation, cant strips, flashing, roof felts, caulking and nails must
be furnished by the installer See separate curb specifications from manufacturer

MUA-SVX004B-EN 7
General Safet Information
WWAARRNNIINNGG
HHaazzaarrddoouuss SSeerrvviiccee PPrroocceedduurreess!!
FFaaiilluurree ttoo ffoollllooww aallll pprreeccaauuttiioonnss iinn tthhiiss mmaannuuaall aanndd oonn tthhee ttaaggss,, ssttiicckkeerrss,, aanndd llaabbeellss ccoouulldd
rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy
TTeecchhnniicciiaannss,, iinn oorrddeerr ttoo pprrootteecctt tthheemmsseellvveess ffrroomm ppootteennttiiaall eelleeccttrriiccaall,, mmeecchhaanniiccaall,, aanndd
cchheemmiiccaall hhaazzaarrddss,, MMUUSSTT ffoollllooww pprreeccaauuttiioonnss iinn tthhiiss mmaannuuaall aanndd oonn tthhee ttaaggss,, ssttiicckkeerrss,, aanndd
llaabbeellss,, aass wweellll aass tthhee ffoolllloowwiinngg iinnssttrruuccttiioonnss:: UUnnlleessss ssppeecciiffiieedd ootthheerrwwiissee,, ddiissccoonnnneecctt aallll
eelleeccttrriiccaall ppoowweerr iinncclluuddiinngg rreemmoottee ddiissccoonnnneecctt aanndd ddiisscchhaarrggee aallll eenneerrggyy ssttoorriinngg ddeevviicceess
ssuucchh aass ccaappaacciittoorrss bbeeffoorree sseerrvviicciinngg FFoollllooww pprrooppeerr lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree
tthhee ppoowweerr ccaann nnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd WWhheenn nneecceessssaarryy ttoo wwoorrkk wwiitthh lliivvee eelleeccttrriiccaall
ccoommppoonneennttss,, hhaavvee aa qquuaalliiffiieedd lliicceennsseedd eelleeccttrriicciiaann oorr ootthheerr iinnddiivviidduuaall wwhhoo hhaass bbeeeenn
ttrraaiinneedd iinn hhaannddlliinngg lliivvee eelleeccttrriiccaall ccoommppoonneennttss ppeerrffoorrmm tthheessee ttaasskkss
• The use or storage of gasoline or other flammable vapors or liquids in open containers in the
vicinity of this appliance is hazardous
• If you smell gas:
–Do not touch electrical switches
–Extinguish any open flames
–Immediately call your gas supplier
• Failure to comply with the general safety information may result in extensive property
damage, severe personal injury or death!
• This product must be installed by a licensed plumber or gas fitter when installed within the
Commonwealth of Massachusetts
• Do not alter the unit heater in any way or damage to the unit and/or severe personal injury or
death may occur!
• Never service any component without first disconnecting all electrical and gas supplies to the
unit or severe personal injury or death may occur!
• Ensure that all power sources conform to the requirements of the unit heater or damage to
the unit will result!
• Installation must be made in accordance with local codes, or in absence of local codes, with
the latest edition of ANSI Standard Z223 1 (NFPA No 54) National Fuel Gas Code All of the
ANSI and NFPA Standards referred to in these installation instructions are those that were
applicable at the time the design of the appliance was certified The ANSI Standards are
available from the American National Standards Institute, Inc , 11 West 42nd Street, New
York, NY, 10036 or www ansi org The NFPA Standards are available from the National Fire
Protection Association, Batterymarch Park, Quincy, MA 02269
• If installed in Canada, the installation must conform with local building codes, or in absence
of local building codes, with current CSA-B149 1 “Installation Codes for Natural Gas Burning
Appliance and Equipment” or CSA-B149 2 “Installation Codes for Propane Gas Burning
Appliances and Equipment” These outdoor duct furnaces have been designed for and
certified to comply with CSA 2 6
• These units have been designed and certified for outdoor use only, and may be located on
the roof of the building or at any convenient location external of the building to be heated
The input range is 100,000 BTU/HR (29 3 kW) to 400,000 BTU/HR (117 1 kW) in 50,000 BTU/
HR (14 6 kW) increments
• Service Access Panel Removal: To remove an access panel door, use the following
procedure: remove the two screws and two washers from the louvered flue discharge area of
the service panel (power vent doors only) Each panel is held in place with two “Grip”
Latches Using a slotted head screw driver, turn the latch screwhead counter clockwise Using
the handle provided, pull the panel upwards Pull the bottom of the panel out and lower the
panel to disengage it from the top lip To replace an access door panel, guide the panel door

8MUA-SVX004B-EN
upwards on the tracks, and push up into the top lip; swing and lower the panel in place until it
engages with the bottom panel Turn the screwhead on each latch clockwise The screw must
turn freely one quarter turn before resistance is felt in order for the lock to engage If the latch
does not hold, turn the screw counter-clockwise several turns and repeat the above
procedure Also refer to Figure 8, p 18,Figure 9, p 18, and Figure 10, p 19 for more
specifications
• The venting is an integral part of the unit and must not be altered in the field The Natural
Vented units are equipped with a vent cap which is designed for gravity venting Air for
combustion enters at the base of the vent through a protective grille, and the design of the
vent cap is such that the products of combustion are discharged at the upper section of the
cap This cap is shipped in a separate carton; it should be fastened in position as shown in the
Vent Cap Assembly figure (Figure 7) in the Venting section, and should not be altered in any
way
• The Power Vented unit has a power venting system with the inlet and discharge grille located
in the upper section of the side access panel This balanced flue design also preforms well
under all wind conditions
• All internal parts of the standard unit are fabricated from aluminized steel Standard burners
are pressed aluminized steel and have a stainless steel burner port protector and air shutters
All internal and external jacket parts are fabricated from galvanized steel Stainless steel heat
exchangers, burners and flue collectors are optional An optional 321 or 409 stainless steel
heat exchanger is highly recommended for the following applications:
1 When the entering air temperature is below 40°F (4 4°C),
2 When the furnace is installed downstream of a cooling coil section
• A pilot burner plate is provided for access to the pilot burner and ignition systems without
removing the burner drawer Clearances between the external unit and obstruction must be
sufficient for proper servicing of pull-out drawer See Figure 1, p 9, and Figure 2, p 10 for
this clearance
• The outdoor units are certified for operation on either natural or propane gas If a unit is to be
installed at an altitude exceeding 2000 ft (610 m) above sea level, derate the input by 4% for
each 1000 foot rise(305 m rise) above sea level Check all local codes
• Special orifices are required for installations above 2000 ft (610 m) Check all local codes
• In Canada, if a unit is to be installed at the altitudes of 2000 ft (610 m) to 4500 ft (1372 m), the
unit must include an orifice to 90% of the normal altitude rating
• Unless otherwise specified, the following conversions may be used for calculating SI unit
measurements:
–1 inch = 25 4 mm
–1 foot = 0 305 m
–1 gallon = 3 785 L
–1 pound = 0 454 kg
–1 psig = 6 894 kPa
–1 cubic foot = 0 028 m3
–1000 Btu/Cu Ft = 37 5 MJ/m3
–1000 Btu per hour = 0 293 kW
–1 inch water column = 0 249 kPa
–liter/second = CFM x 0 472
–meter/second = FPM ÷ 196 8
GGeenneerraall SSaaffeettyy IInnffoorrmmaattiioonn

MUA-SVX004B-EN 9
Specifications
Figure 1. Standard Natural Vented Outdoor Duct Furnace
4" (102)
5-1/16"
(129)
Electrical
Connections
5/8" (16) Typ.
Anchor Hole
Location
Vent Cap
Is Shipped
In Separate
Carton
A
C (Typ.)
10-1/8"
(257)
B
Opening Typ.
13/16" (21) Typ.
Anchor Hole
Location
Gas
Connection
8-3/4"
(222) *
F
1" (25) 26"
Typ. (660)
31-1/4"
(794)
C
L
D
39"
(991)
19"
(483)
Opening
K
1-1/8" (29)
Typ. Duct
Flange
Table 1. Dimensional Data
USCAPACITY CANADA GAS INLET
A(CA) B C D D *F K NAT LP
32-7/8 15-9/1610 12 11 20-11/16 30-3/1619-3/8 1/2
(835) 1/2 (395) (305) (279) (525) (492) (767)
15 21-1/218-5/1632-7/8 16 25-3/16 30-3/1623-1/2 1/2
(835) 1/2 (465) (546) (406) (640) (597) (767)
23-13/1620 43-7/8 23-1/2 16 25-3/16 26-1/4 41-3/16 1/2 1/2
(1114) (605) (597) (406) (640) (667) (1046)
25 43-7/8 29-5/16 23-1/2 16 25-3/16 34-1/2 41-3/16 3/4
(1114) (745) 3/4 (597) (406) (640) (876) (1046)
30 54-7/8 34-13/16 26 17-1/2 26-11/16 37-1/4 52-3/16 3/4
(1394) (884) 3/4 (660) (445) (678) (946) (1326)
35 54-7/8 40-5/16 26 17-1/2 26-11/16 45-1/2 3/452-3/16
(1394) 4/3 (660)(1024) (445) (678) (1156) (1326)
40 60-3/8 45-13/16 26 17-1/2 26-11/16 51 57-11/16 3/4 4/3
(660) (1164) (445) (1295) (1465)(1534)
(678)
NNootteess::
Dimensional Data applies to both Figure 1, p. 9 and Figure 2, p. 10
Dimensions are in inches. Dimensions in parenthesis are in millimeters. .
* “F” dimension is the recommended clearance to service the burner drawer(s).
Refer to Figure 6 for additional clearance requirements.

10 MUA-SVX004B-EN
Figure 2. Standard Power Vented Outdoor Duct Furnace
4" (102)
1" (25)
Typ.
5-1/16"
(129)
Electrical
Connections
Anchor Hole
Location
5/8" (16) Typ.
A
10-1/8"
(257)
B
Opening Typ.
Anchor Hole
Location
13/16" (21) Typ.
Gas
Connection
8-3/4"
(222) *
F
26"
(660)
31-1/4"
(794)
C
L
39"
(991)
19"
(483)
Opening
K
1-1/8" (29)
Flange
Typ. Duct
Flue
Product
Outlet
Air Inlet
Combustion
SSppeecciiffiiccaattiioonnss