10
4-1/2"
47-9/16"
7-1/2"
4-1/16 DIA.
POWER THRU
THE CURB
RETURN
19-3/8
31-3/8
LOW VOLTAGE
ENTRANCE
HIGH VOLTAGE ENTRANCE
(REMOVE PLUG)
ElEctRIcal
EntRancE
and
tHRU
cURb
(
bottoM
vIEW
of
UnIt
)
l
oW
v
oltaGE
c
ontRol
W
IRInG
1. A 24V thermostat must be installed for unit operation.
2. Locate thermostat or remote sensor in the conditioned
space where it will sense average temperature. Do
not locate the device where it may be directly exposed
to supply air, sunlight or other sources of heat. Follow
installation instructions packaged with the thermostat.
3. Use #18 AWG wire for 24V control wiring runs not
exceeding 75 feet. Use #16 AWG wire for 24V control
wiring runs not exceeding 125 feet. Use #14 AWG
wire for 24V control wiring runs not exceeding 200
feet. Low voltage wiring may be National Electrical
Code (NEC) Class 2 where permitted by local codes.
4. Route thermostat wires from sub-base terminals
to the unit. Control wiring should enter through the
condenser panel opening or through curb indicated in
“Electrical Entrance” figure. Connect thermostat and
any accessory wiring to low voltage terminal block
TB1 in the main control box.
5. For two-stage heating operation, remove the factory
installed jumper connecting W1 and W2 terminals on
terminal block.
notE: f
IEld
-
SUPPlIEd
condUIt
May
nEEd
to
bE
InStallEd
dEPEndInG
on
UnIt
/
cURb
confIGURatIon
.
U
SE
#18 aWG
SolId
condUctoR
WIRE
WHEnEvER
connEctInG
tHERMoStat
WIRES
to
tERMInalS
on
SUb
-
baSE
. do not
USE
laRGER
tHan
#18 aWG
WIRE
. a
tRanSItIon
to
#18 aWG
WIRE
May
bE
REqUIREd
bEfoRE
EntERInG
tHERMoStat
SUb
-
baSE
.
notE: R
EfER
to
UnIt
WIRInG
dIaGRaMS
foR
tHERMoStat
oR
REMotE
SEnSoR
connEctIonS
.
GAS SUPPLY PIPING
WARNING
t
o
PREvEnt
PERSonal
InjURy
oR
dEatH
dUE
to
IMPRoPER
InStallatIon
,
adjUStMEnt
,
altERatIon
,
SERvIcE
oR
MaIntEnancE
,
REfER
to
tHIS
ManUal
.
f
oR
addItIonal
aSSIStancE
oR
InfoRMatIon
,
conSUlt
a
qUalIfIEd
InStallER
,
SERvIcER
aGEncy
oR
tHE
GaS
SUPPlIER
.
IMPoRtant notE: t
HIS
UnIt
IS
factoRy
SEt
to
oPERatE
on
natURal
GaS
at
tHE
altItUdES
SHoWn
on
tHE
RatInG
PlatE
.
WARNING
t
o
avoId
PRoPERty
daMaGE
,
PERSonal
InjURy
oR
dEatH
WHEn
EItHER
USInG
PRoPanE
GaS
alonE
oR
at
HIGHER
altItUdES
,
obtaIn
and
InStall
tHE
PRoPER
convERSIon
kIt
(
S
). f
aIlURE
to
do
So
can
RESUlt
In
UnSatISfactoRy
oPERatIon
and
/
oR
EqUIPMEnt
daMaGE
. H
IGH
altItUdE
kItS
aRE
foR
U.S.
InStallatIonS
only
and
aRE
not
aPPRovEd
foR
USE
In
c
anada
.
The rating plate is stamped with the model number, type of
gas and gas input rating. Make sure the unit is equipped
to operate on the type of gas available. Conversion to
propane (LP) gas is permitted with the use of the factory
authorized conversion kit (see the unit Technical Manual for
the appropriate kit). For High Altitude derates, refer to the
latest edition of the National Fuel Gas Code NFPA 54/ANSI
Z223.1 or National Standard of Canada, Natural Gas and
Propane Installation Code, CSA B149.1.
NATURAL
Min. 5.0" W.C., Max. 10.0" W.C.
PROPANE
Min. 11.0" W.C., Max. 14.0" W.C.
INLET GAS PRESSURE
InlEt
GaS
PRESSURE
MUSt
not
ExcEEd
MaxIMUM
valUE
SHoWn
In
tablE
abovE
.
The minimum supply pressure should not vary from that
shown in the table above because this could prevent the
unit from having dependable ignition. In addition, gas input
to the burners must not exceed the rated input shown
on the rating plate. Overfiring of the unit could result in
premature heat exchanger failure.
