Trane GRAA Owner's manual

^
AF
Installation
GRAA-IOM-1
Operation
Maintenance
Library
Service
Literature
P roduct
Sec t
ion
Air
Handling
Product
Make - Up
Air
Model
GRAA ,
GRBA ,
GRCA ,
GRDA
Literature T
ype
I
nstallation ,
Operation ,
Maintenance
Sequence
^
Date
January
1995
File No.
SV - AH -
MUA -
GRAA - IOM -
1 - 1
95
Supersedes
Ne
w
Rooftop
Gas
Heating ,
Cooling
and
Ventilating
Unit
Sizes
100
MBh -
1200
MBh
" A "
Design
Sequence
Since
the
Trans
Company has
a policy of
continuous product
improvement, it
reserves
the right to
change
specifications
and
design without
notice.
The installation
and servicing
of the
equipment referred
to in this
booklet
should be
done
by
qualified,
experienced
technicians.
OAmerican
Standard
Company
1995

General
Information
Literature
Chang
e
History
GRAA
- IOM
- 1 (January
1995
)
Original
issue
of manual
describes
installation
of GRAA,
GRBA,
GRCA,
GRDA
Rooftop
Gas
Heating,
Cooling
and
Ventilating
Units,
for A
Design.
Warnings
and
Cautions
Notice
that
WARNINGS
and
CAUTIONS
appear at
appropriate
intervals
throughout
this
manual.
Warnings
alert
installer,
owner,
operator
or service
personnel
to
potential
hazards
that could
result
in
personal
injury
or
death.
Cautions
are provided
to alert
personnel
to
conditions
which
could
result
in
damage
to the
equipment
or
cause
property
damage.
Receiving
Instructions
Inspect
shipment
immediately
when
received
to determine
if
any
damage
has occurred
to the unit
during
shipment.
After
the unit has
been
uncrated,
check
for any
visible
damage
to the unit.
If any
damage
is
found, the
consignee
should
sign the
bill of
lading
indicating
such
damage
and
immediately
file claim
for damage
with
the transportation
company.
FOR YOUR
SAFETY
:
If you
smell
gas :
1 . Open
windows
.
2 . Don
' t
touch
electrical
switches
.
3 .
Extinguish
any
open flame
.
4 .
Immediately
call your gas
supplier .
FOR
YOUR
SAFETY:
The
use
and storage
of gasoline
or
other
flammable
vapors
and
liquids in
open
containers
in
the
'
vicinity
of this
appliance
is
hazardous.
WARNING:
Improper
installation,
adjustment,
alteration,
service
or
maintenance
can
cause property
damage,
injury
or
death.
Read
the
installation,
operating
and
maintenance
instructions
thoroughly
before
installing
or
servicing
this
equipment.
Warnings
Approved
for use
in California
when
equipped
with
spark
ignition
.
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
instal
l ation
,
problems such
as loose
wires,
leaks or
loose
fasteners
may
occur.
It is the
installer
' s
responsibility
to inspect
and
correct
any
problems
th
a t may be
found
.
Install,
operate and
maintain
unit in
accordance
with
manufacturer's
instructions
to avoid
exposure
to
.,
fiP
P
R
OYED
fuel
substances
or
substances
from
incomplete
combustion
which can
cause
death
or
serious
illness.
The
state
of
California
has
determined
that
these
substances
may
cause
cancer,
birth
defects,
or other
reproductive
harm.

Model
Number Description
(All furnaces)
DIGIT
1 - Gas
Heating
Equipment
G =
G as
DIGIT 2 - Unit
Type
F = Rooftop D uct
Furnace
R = R
oofto p
H
eating
U
ni t
S
= Special
U ni t T y p
e
DIGIT
3 - Furnace
Type
A
= S t a ndard
T e m p
R
ise (
20 -6 0 D eg. F )
LH
B = S tandard
Te m p R ise ( 2
0-
60
Deg .
F )
RH
C = High
Temp Rise (60-90
Deg. F)
LH
D
= High
Tem p R is e
(60-90 De
g.
F ) RH
E = B lank F
urnac e S
l
ee v e
LH
G
= Blank
Furnace
Sleeve RH
S
= Special
Furnace
Type
DIGIT
4
-
Development
Sequence
A
= F irs t G
eneratio n
DIGIT 5,6
-
Input
Capacity
Single Furnace
10 =
100
MBh Input 30 =
300 MBh
Input
15 = 150
MBh Input 35 =
350 MBh
Input
20 = 200
MBh
Input 40 =
400 MBh
Input
25 =
250
MBh x
Double Furnace
50 = 500
MBh Input 70 =
700 MBh
Input
60 = 600
MBh Input
80 =
800
MBh Input
Triple Furnace
12 = 1200
MBh Input
SS
=Special
unit
DIGIT
7 - Venting
Type
G = G ravi t y V e n
ting
P = P ower
Ventin g
S = S pecial
V enting
DIGIT 9
- Gas
Control Option
(Intermittent Pilot Ignition)
A = Single-Stage
B = Two-Stage
C
= Hydraulic
Modulating (60-100)
D = Hydraulic
Modulating
(75-200)
E
= Hydraulic
Modulating W/Bypass and
limit
(60-100)
F = Hydraulic
Modulating W/Bypass
(75-200)
G = Electronic
Modulating W/Room T-Stat
H = Electronic
Modulating W/Duct T-Stat
J = Electronic
Modulating
W/Duct T-Stat
and
Override Room
Thermostat
K=
Electronic Modulating
W/External 4-20
mA Input (Furnace 1)
L = Electronic
Modulating W/External 4-20
mA
Input
M=
Electronic
Modulating W/External 0-10
VDC Input
(Furnace 1)
N
= Electronic
modulating
W/External 0-10
VDC
Input
P =
VAV Control Two-Stage
R=
VAV Control Three-Stage
T =
VAV Control Four-Stage
U =
S-350 2 Stage Modular Electronic
Control
System
W =
S-350 3
Stage Modular Electronic
Control System
X =
S-350 4 Stage
Modular Electronic
Control System
Y = S-350 6
Stage Modular Electronic
Control
System
S
=Special Gas
Control
DIGIT
13
- Heat
Exchanger Material
1
= Aluminized
S teel
2
= # 409
St ainless
S
teel ( F
i r s
t
Furn
a
ce
Only)
3 = #409 Stainless
Steel (All
Furnace
Sections)
4 = # 3 21 S
t a
inless
S t e el ( F irst
F
ur n ac e
O nly)
5 = #3 21 St ainless
S teel
( A ll
F ur na
ce
Sections)
6
= # 4 09
S tainless
S
teel
P
ackag
e ( F ir s t
Furnace Only)
7 = #409 S tainless
St
eel
P
acka
ge (
A
ll
F urnace S ections)
8
= #32 1 S tainless
S
teel P acka
g
e( F
irs t
Furnace
Only)
9 = #321
Stainless
Steel P acka g e(
A
ll
F urnace S ec t ions)
S
= Special
Heat Exchanger P ackage
DIGIT
14
- Rooftop
Arrangements
(Des i gnator
A -
L Assumes Furnace
S
ecti
on )
A
= D uct
Furnace
B
= B lower ( S
tandard)
C
= Blower
(Standard) Plenum
D
= B lower (Standard)
E vaporative
C
oole r
E
= Blower
(Standard) E vaporativ e
C ooler/Plenum
G =Blower (High CFM)
J = B lower
( H
igh C
F M
)/Plenum
K = B lower
(
H igh C F M )/ C oolin g
L = B lower
( H
igh C
F
M )/ C oo lin
g
/ P le n u m
S =
S
pecial R oofto p
A
rr a ng m ent
DIGIT 8
- Main
Power Supply
A =
115/60/1 E =230/60/3
B =
208/60/1
F =
460/60/3
C =
230/60/1 G =
575/60/3
D =
208/60/3 S = Special
Main
Power
Supply
DIGIT
10
-
Design
Sequence
A =
F irst D esi gn
DIGIT
11
-Design
Sequence
0=
F irst
D
esign
DIGIT
12
-
Fuel
Type
N
=
N atural
Ga
s
P =
LP G as (
P ropane)
L =
N a
t
ural G as
with 1 00% L
ockout
S
=
S pecial
F uel
type
DIGIT 15
= Roo fto p
H
eati
ng Un
i
t
Motor
Selection
0 = N one
(Rooftop duct furnace)
A = 1/2 HP w/contactor
B =
3/4 HP
w/contactor
C = 1
HP w/contactor
D = 1 1/2 HP
w/contactor
E = 2 HP w/contactor
F = 3
HP w/contactor
G =
5 HP
w/contactor
H = 1/2 HP w/magnetic starter
J = 3/4 HP w/magnetic
starter
K = 1 HP
w/magnetic
starter
L = 1 1/2 HP
w/magnetic starter
N =
2
HP w/magnetic starter
P =
3
HP w/magnetic starter
Q = 5
HP
w/magnetic
starter
R = 7
1/2
HP
w/magnetic starter
T = 10 HP
w/magnetic starter
U = 15
HP w/magnetic starter
S = Special
Motor
1a

DIGIT 16 = Motor
Speed
0 = N o
Selection
1 = Single
Speed ODP 1 800
RPM
2 = Single
Speed T EF C 180 0 R PM
3
=Single S peed H
igh E
fficiency ODP
1800 RPM
4 = S ingle
S p eed H
igh E fficie n c y
TEFC
1800 RPM
5 = 2S1
W ODP
1800/900 RPM
6 = 2S2W
ODP 1800/1200
RPM
7 = Special
M o t o
r Spee d & S
tarter
DIGIT 17 =
Coil
Options
0 = N o
cooling coil
selection
A = DX
coil, 4 R ow,
Single C
ircuit
B =
DX coil, 4 R
ow, D ual C
ircui
t
C =
DX coil, 6 R ow, S
ingle
Circuit
D = DX coil, 6 R
ow, D ual C
ircuit
E = Chilled
W ater C
oil, 4 R ow,
G = Chilled
Wa t
er Co il, 6 R
ow,
S = Special
coil
DIGIT 18
= Air
Inlet
Configuration
0 = N one ( R
ooftop
duct
furnace)
1 = Outside
Air( OA )
2 = Outside
A ir W /
A ir H ood
3 = R etur n
Air( R A)
4 = Outside
An d R
eturn A ir (
OA / RA )
5 = Outside
and R e t
urn Air W / A
ir H ood
S = Special A
ir inlet
configu r a t io n
DIGIT 19
= Air
Control & Damper
Arrangement
0 = N one (
R ooftop duct
f urnace)
A = O u t side
Air 2 pos. M otor/ SR
B = R eturn
Air 2 pos. Mo tor/
SR
C =
OA / RA 2 p os S
R
D =
OA / RA M o
d
M i r . W / M
ixe d A ir
C on t
rol/ M in. P o t
E = O
A/ R A M od
M tr W / M ixe d A
ir
Control/Min Pot/SR
G = OA
/
RA
M od
Mi r
W
/
M
ixed A ir Co ntr o l
H =
O A / RA
Mod Mtr
W/Mixed Air Control/ SR
J =
O A/
RA M od M tr W / M i n
P o
t
K =
OA/RA Mod
Mtr W/Min
P
ot/SR
L = O A /
RA
M
od Mtr w
/ D
ry
B ulb/ M ixe d A
ir
C o
n trol/ M in P ot
M = O
A/ RA M od
M tr w/ D
ry
B
ulb/ M ixe d A ir
C
ontrol/ M in
P ot/S R
N = OA
/
R
A M od
Mi r
w/ E nthalpy Co n
trolled
E conomizer/ SR
P = OA
/
RA
M o d M tr W / S p
ac e P re ss ur e
Controller
R =
OA / RA M od
M tr W / S -35 0 P
Proportional
Mixed
Air Control/SR
T =
OA
/
RA
M tr.
W /External
0- 10 VDC a
nd
4 - 20 mAAn
alog Inpu t
/( Ex tern a l In pu t)
U =
OA / RA
M tr. W /Exter na l
0 - 10 VDC a n d
4 -
2
0
m A A
nalog I npu t / SR (
Exte rnal I npu t )
W = A
shrae C ycle
I ( OA / RA 2 p os,
w/warm-u p stat/ SR
X =
Ashrae C
ycle I I ( OA / RA M
o d
W / W
arm-up S ta t/ M
ixe
d A ir/min
pot/S R
Y =
Ashrae
C ycle 111( O
A/RA M o d .
W/Warm-up
St at/ M ixed
Air/ SR
Z = M anual
D ampe
r
s
S = S pecial
air control a n d dam p
er
a r r ange m e
n
t
DIGIT 20
0 = N o n - C ali fo rnia
S hi pm ent
1 = California
Shipment
DIGIT 21 = Miscellaneous
Options
A = O rifice s
For E lev at io n A bov e 2 000 F
e et
( S pe c i f y E
l
e v a
ti
o n)
B = 1 2" E va p
or
a
tive M ed i a
C = M ois t ure
E limin at ors
D = H ori zonta l R
eturn
E = I nterlock
R elay -2 4V C
oil DPD T 1 0 A
F = Fr e e ze s t at
G = Fa n
T i m e D elay C on tr
ol ( D uc
t
F urnac e
Only)
H =
R etu r n A
ir Fir
e
sta
t
J= Supply Air
Firestat
K = M anual B lower S
wi
t
ch
L = 4 09 S
tainle ss S teel Furnace
D rip Pa n
N = F oil
F ace I
nsulation
P = Lo w Le ak
Da mpers
Q
= C logg ed
Filter S witch
R = H ig h /L ow
G as P ress u re L i m i t S
wi
t
c h e s
T = St a t us
Indicat o r La m ps (
E lec cab ine t )
V = Manu al Res et H
i gh
L imi t
Sw i tc h
W =Interl o ck Re lay -
2 4/ 1 15 V Co il
SPDT
10A
X = I nt e rloc k R
elay - 24 /1 1 5- 2 3
0V
Co
il
DPDT 1 0A
lb

Model Number
Description
(Air
Handling Units)
D I GIT 1 ,
2
- U
nit
T y p e
A H =
Air
Handling U
nit
DIGIT 3
-
Furnace
Type
0 = N one
DIGIT 4
- De
v
elopment
Sequence
A = F irst G
eneration
DIGIT 5 , 6 -
Unit Size
20
=
1500
-
8000 C fm
4
0 =
400 - 14000 Cf m
DIGIT 7
-
Vent i ng
Type
0 = N one
DIGIT 8 - Main
Power
Supply
A =
115/60/1
E =230/60/3
B = 208/60/1
F =460/60/3
C =
230/60/1 G =
575/60/3
D = 208/60/3
S = Special
Main
Power
Supply
D I
GIT
9 - Gas
Control Option
0 = N o
gas con t rol
optio n
DIGIT 9 - Gas
ConTrol
Option
(Intermittent Pilot Ign i
tion) (Cont . )
P = VAV C
ontrol Two- St
age
R = VA V Con t
rol T hree-Stage
T =
VAV Control F
our-Stage
U = S -350 2
S t age
Modular E lectronic
Control System
W = S -350 3
Stage M
odular E lectronic
C ontrol System
X = S-350 4
Stage M o d ular
E lectronic
Control
System
Y =
S-350 6
Stage M odular
E lectronic
Control System
S = Special
Gas C
ontrol
D I
GIT 10 - Design
Sequence
A = Firs t D
esign
DIGIT 11
- Design
Sequence
0 = First
Design
DIGIT 12
- Fuel
Type
0 =
No selection
DIGIT 13
-
Heat
Exchanger M
aterial
0 =
No selection
DIGIT 14
- Air
Handler
Arrangements
B = Blower
(Standard)
C = Blower
(Standard)
Plenum
D = Blower
(Standard)
Evaporative
Cooler
E = Blower
(Standard)
Evaporative
Cooler/Plenum
G
=Blower (High
CFM)
J
=Blower (High
CFM)/Plenum
K
=Blower (High
CFM)/Cooling
L =Blower
(High
CFM)/Cooling/Plenum
S
=Special Rooftop
Arrangment
DIGIT 15 = Motor
Selection
A = 1/2
HP w/contactor
B =
3/4
HP w/contactor
C = 1
HP w/contactor
D =
1
1/2 HP
w/contactor
E = 2 HP
w/contactor
F = 3
HP w/contactor
G =
5 HP w/contactor
H =
1/2
HP
w/magnetic starter
J =
3/4
HP w/magnetic
starter
K = 1 HP
w/magnetic starter
L = 1 1/2
HP w/magnetic
starter
N = 2 HP
w/magnetic starter
P = 3 HP
w/magnetic starter
Q = 5 HP
w/magnetic starter
R = 7 1/2 HP
w/magnetic starter
T = 10 HP
w/magnetic starter
U = 15
HP w/magnetic starter
S = Special
Motor
DIGIT 16 =
Motor
Speed & Starter
0 = N o
Selection
1 = S ingle S peed
O D P 1800 RP M
2 = Single
Speed T EF C
1 800 RPM
3 = Single
Speed High Efficiency
O DP
1800 RP M
4 = S ingle
S peed
High
E
fficiency
TEF C 1800 R P M
5 = 2 S1 W O D P 1
800/900 R P M
6 =
2S2W ODP
1800/1200 RP M
7 = Special
Motor
Speed & Starter
DIGIT 17 = Co l l
Options
0 = N
o co o ling coil
selection
A =
DX coil, 4 R ow,
Single C ircuit
B =
DX coil, 4 R ow,
D ual C ircuit
C = DX
coil, 6 R ow,
Single C ircuit
D = DX coil, 6 R ow, D
ual Circui t
E = C hilled
Water Coil, 4 R ow, S
ingle C ircuit
G = C hilled
Water C oil, 6 R ow,
D ual C ircuit
S = Special
coil
D IGIT 18 = Air
Inlet
Configuration
1 = Outside
Air(OA)
2 = Outside
Air W/Air Hood
3 = Return
Air(RA)
4 = Outside
And
Return Air
(OA/RA)
5 = Outside
and
Return Air W/Air Hood
S = Special
Air
inlet configuration
DIGIT 19 = Air
Control &
Damper
Arrangement
0 = N
o S election
A
= Outside
Air 2 pos. Mo t
or/S R
B = R eturn
Air 2 p os. M otor/S R
C =
OA/ RA 2 pos S R
D =
OA/ RA
M
o d Mtr.
W/
M
ixed Air
C ontrol/ M in. P ot
E =
OA/ RA Mod M t
r W/Mixed A ir
C
ontrol/Min P
ot/
SR
G =
O A/ RA M od M ir
W/Mixed Air C ontrol
H = OA/R A M od M
tr W/Mixe d
Air C ontroVS R
J =
O A/ R A M od
M tr W/ M in P o t
K =
OA/ R A M od M
tr W/ M in
P
ot/ SR
L =
O A/R A M o d
Mtr W/D
ry
B ulb/ M
ixed Air
Co n
tr ol/ M in P ot
M =
OA/
R A M od M tr W/ D
ry
B ulb/ M
ixed A ir
C ontrol/ M in P ot/ SR
N = O A/ R A M od Mtr W/ E nthalpy
C ontrolled E conomi z er/ SR
P =
O A/ R A
M od M t r W / S pace P
ressure
Controller
R = OA/ R A M od M tr
W/
S-350
P
P roportional M ixed A ir C ontrol/ SR
T =
OA/R
A M tr. W/External 0 -10 VDC
and
4-20mAAnalog
I n p ut/(External
Inpu t )
U = O A/ RA M t r . W/ E
xternal
0-10 VDC
an d
4 - 2 0
m
A Analog Inpu
t/ SR (
E xternal I npu t )
W =
Ashrae C ycle I( O
A/
RA 2 pos.
w/warm-up
stat/ SR
X = Ashrae C ycle I I (OA/ RA M o d
W/Warm-u p Stat/ M ixed Air/min
p ot/ SR
Y = Ashrae Cycle III(OA/ R A Mod.
W/Warm-up Stat/ M ixed Air/S R
Z
= M anual
D ampers
S = Special air control and damper
arrangement
DIGIT 20
- California
Sh i pment
0
= N on- C alifornia
Shipment
1 = C alifornia
Shipmen
t
DIGIT 21
= Miscellaneous
Options
A =
O rifices
F
or E levation A bove 2000
(Specify E levation)
B = 12" Evaporative M edia
C =
Mois t ure
E liminators
D =
Horizontal
R
eturn
E =
Interlock
R elay -2 4 V C oil DPDT 1
F =
Freezestat
G =
Fan
T ime D elay C ontrol ( D uc t
F ur
Only)
H = Return
Air Firestat
J= Supply
Air Firestat
K = Manual
Blower Switch
Feet
OA
ace
L = 409
Stainless Steel Furnace Drip
Pan
N
=Foil Face Insulation
P =Low Leak Dampers
Q =Clogged Filter Switch
R =High/Low
Gas Pressure Limit
Switches
T =Status
Indicator Lamps (Elec
cabinet)
V =
Manual
Reset High Limit
Switch
W =Interlock Relay
-24/115V Coil SPDT
10A
X= Interlock
Relay
-24/115-230V Coil
DPDT 10A
1c

TABLE
OF
CONTENTS
1 .
RECEIVING &
PRE -
INSTALLATION
INSTRUCTIONS
Access Panel Removal
...:................ 3
Rigging ........ .... ................3
Combustion Air Considerations
.............. 3
Location .....................
.......3
Mounting
/
Locations
..................... 3
II .
GENERAL REQUIREMENTS ............. 3
III .
INSTALLATION
Installation Clearances ....................
5
Mounting on Field Furnished
Supports ........ 5
Mounting on Roof Curb ...................
6
Venting ...............:................6
Duct Connections.......
...........
...
6
Gas
Piping
...........................6
Modulating
Gas
Control .. ..............
.
8
'Electrical Connections ... ............... 9
DX Coil Equipped Units
..................
10
Chilled Water Coil Equipped Units .......... 11
Evaporative Cooling Equipped Units ......... 11
IV . OPERATION
General Information
.....................
11
Gas Control System
..... ........
.
.....
11
Optional Gas Controls ... ' .............. 12
Air Handling
Requirements
and A
djustments
. .
12
Lighting
........... ........... 13
Gas Input Adjustment....
.............. 14
Pilot
Adjustment
........................
14
Primary Air
Shutter Adjustment ............. 14
Controls
..............................14
V . START
UP ...........
............... 15
VI
.
MAINTENANCE
......! ...............
16
VII .
TROUBLESHOOTING
................ 19
VII
I.
REP L ACEMENT
PARTS
.............. 24
IX .
SERVICE
NOTE
..... ............. 24
X .
START UP SHEET
....................
25
The following
terms are used
throughout this manual
to
bring attention to the presence of
potential
hazards or to
important information
concerning
the
product:
CAUTION: Indicates an
imminently
hazardous
situa-
tion
which,
if
not avoided, may result
in
minor
injury
or property damage.
NOTE: Used to notify of
special instructions on instal-
lation,
operation or
maintenance which are
important
to
equipment but not
related
to personal
injury haz-
ards.
1 .
RECEIVING INSTRUCTIONS
Inspect
shipment immediately when
received to deter-
mine
if any damage has
occurred to the
crate during
ship-
ment.
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 criti-
cal 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
W
he
n the u
nit
i
s
received and
uncrated,
check
the exter-
nal data plate and
all
labels
on the
unit for
type of gas,
electrica
l , and operational specifications to confir
m
tha
t
t hese agree with those
at
point
o
f installation. If the unit is
equipped with
an
Outdoor Duct Furnace, also check the
d
ata plate and all labels located inside each furnace.
Every
rooftop unit
will
include
an
informational
packet
which
will include the following: The blower manual, out-
door duct furnace and evaporative cooler/cooling coil
manuals (if applicable
to
the
unit order),
wiring
diagram(s),
and
special controls/data sheets.
ACCESS PANEL REMOVAL
Each access panel is held in place with two "grip" latches.
To remove an access panel:
use a slotted head screw dri-
ver to turn the latch
screwhead counter clockwise. Using
the handle provided, push
the
panel upwards.
Pull the bot-
tom of the
panel out and lower the panel to disengage
it
from
the top
lip.
To replace
an
access door
panel, guide
-2-

the
panel door
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
latch does
not
hold,
turn
screw
counter-clock-
wise
several turns
and
repeat the
above
procedure.
RIGGING
Rig unit
using
either
belt or cable
slings.
Use
spreader
bars
to protect
the top
of the
unit
when it is
lifted. See
fig-
ure 1.
On
units
with
a
total
length of
less
than 104"
(2642 mm),
excluding
evaporative
cooler,
two
holes are
provided in
the base
rail on each
side
of the
unit. Slide
pipes
beneath
the unit
through
these
holes and attach
rigging to
pipes for
lifting
the unit.
On
units with a
total
length of a
104"
(2642 mm)
or greater,
excluding evaporative
cooler,
lifting lugs
attached
to the
base
rail are
provided.
Attach
rigging to
lugs
for lifting
the
unit. For
distance
between
lifting lugs and
total
unit
lengths, refer
to
original
Submittal
Sheets
supplied
specified
for the
unit. Also see
Center of
Gravity and
Weights
Sections
in this
manual.
COMBUSTION
AIR
CONSIDERATIONS
The presence
of
chlorine
vapors or
other
corrosive
vapors
in the
combustion
air
supply
for gas-fired
heating equip-
ment
presents
a
potential
corrosive
hazard. Chlorine
will,
when exposed
to
flame,
precipitate
from the
compound
(usually freon
or degreaser
vapors) and
go
into solution
with any
condensation
that is
present in
the heat
exchang-
er or
associated parts.
The
result is
hydrochloric acid
which
will readily
attack all
metals,
including 300
grade
stainless
steel. Care
should be
taken
to
separate these
vapors
from the
combustion
process.
This may
be
done
by wise
location of the
unit
with regard
to
exhausters or
prevailing wind
direction.
LOCATION
Before placing
roofto p
unit in its
permanent
location,
make
certain that
the
roof is
capable
of
carrying
the additional
load
of this
equipment.
Check the
unit
weight given
at the
end of
this manual.
Refer to
Figure 2
for
required
clearances
to
combustible
material.
Figure 1
USE
SPRE A D
T O
PREVE
N
TI
T O U
N I
USE SPRE ADE R BAR
T O
PRE V E N T
DAMAGE
T O
UN IT
MOUNTING/
LOCATIONS
These
units
are
suitable for
installation
on
combustible
flooring.
Single,
double
and
triple duct furnace
only
models
have
base
rails which
can be
mounted
either
on
solid
planking
or
steel channels.
All other
units
installed
on
field
furnished
supports
must use
the
recommended
method
shown in
Mounting
on
Field
Furnished
Supports
or
equivalent.
Roof curb
kits for
rooftop
units are
shipped
unassembled.
Included
with the
roof
curb kit are
insulated
or
uninsulated
curb
rails,
bolts and
screws
needed
for
assembly,
sealant,
a
roll of
self-adhering
rubber
gasketing, and
installation
instructions.
Roof
insulation,
cant
stripping,
flashing,
roof
felts,
caulking,
and
nails
must be
furnished by
the
installer.
See
separate
roof curb
specifications.
II .
GENERAL
REQUIREMENTS
-3-

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
ventcap which is designed
for natural
draft venting. Air for
combustion
enters the
base of the
vent
cap through
a
protective grill
and products of
com-
bustion are
discharged at
the upper section of the vent
cap.
CAUTION
: Insure
that all power
sources conform to
th
e un i t
requirements
or damage to the
unit may
result
Installation
must
be made in accordance with
local codes,
or in
the absence of local
codes, with the latest edition of
ANSI Standard
Z223.1 (N.F.P.A. No. 54) National
Fuel
Gas
Code.
All
of
the
AN SI
and N FPA Standards referred
to in
these installation
instructions
are
those that were
applicable
at the time the design
was certified.
The ANSI
Standards are
available from the American
Gas
Association,
1515 Wilson Blvd., Arlington,
Virginia 22209.
The
NFPA Standards
are available
from the N ational
Fire
Protection
Association,
Batterymarch Park,
Quincy, MA
02269.
If
installed in
Canada,
the installation must conform
with
local
building
codes, or in
the absence of local building
codes, with the
current
CAN/CGA-B149.1 or
B149.2
"Installation
Codes for
Gas
Burning Appliances
and
Equipment'.
T hese outdoor
duct furnaces
have been
designed
for
and certified to
comply with CAN/CGA
2.8.
These units
have
been designed
cert
i
f i ed
for
outdoor
u se only ,
and may
be located on the
roof of the building
or at
any
convenient location
external to
the building to
be
heated.
This
vent cap is shipped
in a separate carton and should
be installed
per the Venting section of the Outdoor
Rooftop
Gas-Fired Duct Furnace Installation
and
Service Manual.
The Power Vented unit has
a
induced
draft
venting
system.
The
combustion
air inlet and prod-
ucts of
combustion discharge grills
are
located
in the
upper section of the Duct
Furnace side access panel.
A pilot
burner plate is provided
in
the Duct
Furnace for
access to the pilot burner
and
ignition
system without
removing
the burner drawer.
Clearance between the
external
unit and any obstruction
must be sufficient for
proper servicing
of pull out burner drawer.
See
Figure
2
for this clearance.
These units
are certified for operation on either natural
or propane
gases. If
a
unit
is
to
be
installed
at an altitude
exceeding
2000 feet (610
m)
above
sea level, Berate the
unit input of
each duct furnace by 4% for each
1000
feet
(305 m) above sea level.
Special main burner gas orifices
are required
for installations above
2000 feet (610 m).
In Canada, if unit
is to
be
installed at altitudes
of 2000
feet (610 m) to 4500 feet
(1372 m), each duct furnace
must have the main
burners re-orificed to give
90% of
the
normal altitude input rating.
If the unit was
ordered from the factory
for high altitude
operation , confirm
input rating . See
Gas Input
Adjustment .
re 2A
,a
.
ow•
. 3 125
( 8 )
3 g
<.x)
-4-

Figure 2B
18"
(457
mm)
A
I
R FLOW
(45 7 mm)
Blower
c
0
U
0
U
U
W
Duct Furnace
I
Duct F urnace
D3 8 6 5
F*
"`
Refer
to Outdoor Duct Furnace Manual
for
spec
i
fic
clearances .
Supply Plenum
16"--
.
(457 mm)
If
a
single, double or triple duct furnace only
unit
is
III .
INSTALLATION
connected to
a
return air duct or any
other inlet air
restriction, the appliance shall be
installed
on
the
positive pressure
side of
the
air
circulating blower.
Installation
must conform with local building
codes
or in the absence
of
local codes with the
National
Fuel Gas Code ANSI
Z223 . 1
latest edi -
t i on
.
A heat
loss study and
a
complete layout
of
the sys-
tem
should
be made
first.
When
locating the unit in its permanent location,
make certain that the roof
is
capable of carrying the
additional load of
the
equipment. Check the unit net
weights section
of
this
manual .
Make certain that clearances are provided
for
ser-
vice,
minimum clearance to combustible material and
to
venting
cap. See figure 2 for
this
information.
Ducts
connected to units
which
do not have
either
a
blower
section
or a supply
plenum must have a
removable access panel in the
duct,
which is con-
nected to a duct furnace. The duct openings shall be
accessible when the unit
is
installed in service and
shall
be
of such size that
smoke or
reflected light
may be observed inside the casing to indicate the
presence of leaks in the heating element. The covers
for the panels shall be attached in such manner as to
prevent
leaks.
Ducts
exposed to
the outdoors
must
be insulated
and sealed
to
prevent
water
from enter-
ing either
the unit
or
building
through
the
duct.
CAUTION: Remove wooden shipping support
from beneath blower
housing
of
Blower Section
to prevent possible unit damage or improper
unit
operation (if applicable).
INSTALLATION
CLEARANCES
Minimum clearances to combustible
material are
shown on the unit data
plate. It
is
important that
clearances be maintained for
servicing the unit (refer
to Submittal Insert for service clearances),
and that
minimum clearances are provided
from the unit
(including
vent
cap, if
Natural Vent model)
to
com-
bustible material. Clearances around
the outside air
hood (if unit is so equipped)
must
be
unobstructed.
See Figure 2.
MOUNTING ON FIELD FURNISHED SUPPORTS
Single, double,
triple
duct furnace
only models have
base rails which
are
suitable for
mounting either
directly
on
solid planking or steel
channels. N ever
install the unit on a soft
roof where the rails could
sink, reducing clearance between the bottom
panel
and the roof, or cause damage to
the roofing surface.
All other models must use
the following method
or
an
equivalent when
unit supports are field
furnished:
Each
section of the Rooftop
unit must be
supported,
which includes supports located
at both ends.
If
the
unit consists of a High CFM
Blower section, a DX
Coil,
a
Duct Furnace and a
Supply Plenum, five sup-
ports are required.
See
Figure
3.
-5-

3
Suppo
rt m
us
t clear return
a i r o penin
g a n d f i t
Ins
i de
b ase rai l f la n g e .
See
Figures 4 & 13
for this dimension.
Support
must fit
inside base rail
f lang e s.
MOUNTING
ON
ROOF CURB
Assemble
and
install roof
curb per Roof
Curb
Installation
Instructions.
See Figures
4
&
13 for roof
opening sizes,
distance
between
openings and
unit
relationship
to
roof curb.
VENTINGt
All venting
installations shall
be in
accordance with
the
latest
edition of
Part
7 ,
"Venting
of Equipment", of
the National
Fuel
Gas
Code, ANSI
Z223.1-1992 (or
the
latest edition),
or
applicable provisions
of local
building
codes.
The
Natural
Vente
d u nits'... are equipped
with
a
vent
cap which
is designed
for
n
atural
draft venting. Air
for
combustion
enters the
base
of
the
vent
cap
through
a protective grill
and
produc t
s
of
combustion are
dis-
charged
at the
upper section
of the vent
cap. t Th i s
ve
nt
c a p i s
sh i pped in
a separate
carton and
s hould
be installed
per the Venting
section of the
Outdo
or
Rooftop
Gas - F i red
Duct Fu r na
c e
In s t a lla ti
on and
Service
Manual .
The Power
Vented
unit
has
a
induced
draft venting
system.
The
combustion
air inlet
and products
of
combustion
discharge
louvers are located
in the
upper section
of the
Duct Furnace side
access
panel. Never
locate these
units in an area
where the
flue
products
discharge
outlet
may be directed at
any
fresh
air
vents.
See the
Outdoor Rooftop Gas-Fired
Duct
Furnace
Installation
and Service
M anual for
installation
and
servicing requirements.
DUCTCONNECTIONS
All
ductwork
must be
properly
supported
so
that
no
strain
is
put
on the
unit. Do
not alter or
bend the dis-
charge
duct flanges supplied
on your
furnace/air
handler.
Ducts
connected to units
which do not have either
a
blower
section or
a supply plenum
must have
a
removable
access panel in the
duct which is con-
nected to
a duct furnace.
The duct openings
shall be
accessible
when the unit is installed
in service,
and
shall be of
such size that smoke
or reflected light
may be observed
inside the casing
to indicate the
presence of leaks
in the heating element.
The covers
for the
panels shall
be attached in
such a manner as
to prevent
leaks. Ducts exposed
to the outdoors
must
be insulated and
sealed to prevent water
from either
the
unit or building
through the duct.
If
a
single,
double or triple
duct furnace
only unit is
connected
to
a
return
air duct, or any other
inlet air
restriction, the
appliance shall
be installed on the
positive
pressure side of the
air circulating blower.
When
connecting
return air
duct
to
Standard or High
CFM
cabinets,
attach duct to return air
opening
flange
when
no dampers are
used. Otherwise, if
dampers are
used, attach return air
duct around col-
lar at bottom of
damper assembly. Also
refer to
the
Submittal Data
Sheets specified for your
unit.
When
connecting
supply air duct to Supply Plenum,
attach duct to
supply air opening flange
when no
dampers
are used. Otherwise,
if dampers are used,
attach supply air
duct around collar at bottom of
damper
assembly. Refer to the
Figure 13.
GAS PIPING
tt
All gas
piping must
be installed in accordance with
local
codes. It
is required that
a
ground union
be
installed
adjacent to
the gas valve of each duct fur-
nace,
and a ground union
be
installed just external
of
each duct furnace
for unit servicing. On vertical
runs,
a
drip leg
should
be provided upstream of any
con-
trol
manifold.
A gas shutoff valve should
be,
or may
be required
by local codes, installed upstream
of the
external
ground
union for
each duct furnace. A 1/8
inch
N.P.T. plugged
tapping,
accessible for test
gauge connection,
must be
installed
immediately
upstream
of the unit gas
supply connection.
tt
For complete
Gas Piping
installation, see
Outdoor
Rooftop
Gas-Fired Duct
Furnace
Installation
and Service
Manual.
It is
recommended that
the gas piping
not
be
installed through
the bottom
of the duct furnace
bot-
tom
panel. If piping
must penetrate
the duct furnace
bottom
panel, it
must be sealed to
prevent water
leakage.
Gas piping
must be installed
to allow
for removal of
burner
drawer for
unit
maintenance. Refer
to Figure 2.
-6-