Tab{e3--MaximumCapacityof Pipe*
NOMINAL
IRON
PIPE
SRZE
(IN.)
I/2
3/4
1
1-1/4
1-1t2
iNTERNAL
DRAMETER
(IN.)
0.622
0.824
1.049
1.380
1.610
Cubic ft of gas per hr for gas
a pressure drop of 05qn wc
LENGTH OF PIPE (FT}
10 20 30 40 50
175 120 97 82 73
360 250 200 170 151
680 465 375 320 285
1400 950 770 660 580
2100 1460 1180 990 900
)ressures of 05 psig(14qn, wc) orless, and
based on a 060 specificgravity gas).
Ref: Table 12-2 NFPA 54-2002
GAS _ _
SUPPLY
MANUAL J II
SHUTOFF I] _
VALVE
(REQUIRED_ f
J
A93324
Fig. 26--TypicN Gas Pipe Arrangement
FIRE OR EXPLOSION HAZARD
Failure to %llow the safhty warnings exactly could result in
serious injury, death o1"propelly damage,
Never test fbr gas leaks with an open flame, Use a commer-
cially available soap solution made specifically fbr d_e
detection of teaks to check all connections A fire or explo=
sion could result causing proper w damage, personal injury or
toss of lif_.
An accessible manual shutoff valve MiST be installed external to
fm'nace casing and within 6 ftof furnace A 1ig=in. NPT plugged
tapping, accessible %r test gauge connection, MUST be installed
immediately upstream of gas supply connection to furnace and
downstleam of manual shutoff valve.
NOTE: The gas valve inlet pressure tap connection is suitable to
use as test gauge connection providing test pressure DOES NOT
exceed maximum 0.5 psig (14=in. wc) stated on gas valve. (See
Fig. 500
Piping should be pressure and leak tested in accordance with
NFG( in the United States or NSCNGPIC in Canada, local, and
national plumbing and gas codes before the Nrnace has been
connected. ARer all connections have been made, purge lines and
check for leakage at furnace prior to operating Nrnace.
If pressure exceeds 0.5 psig (14=in. wc), gas supply pipe must be
disconnected from fl/mace and capped befbre pressure test. If test
pressure is equal to or less than 05 psig (14=in. wc), mm off
electric shutoff switch located on furnace gas valve and accessible
manual shutoff valve before test.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the fhrnace burners ON and OFF.
Step 8--Electrical Connections
See Fig 27 for field wiring diagram showing typical field 115-v
and 24-v wiring. Check all fhcto W and field etectIical connections
for tightness
Field=supplied wiring shall conform with the limitations of 63_T
(35°C) rise.
.... FIELD 24-V WtRtNG
.... FIELD 115-, 208/230-, 460-V WIRING
-- FACTORY 24-V WIRING
-- FACTORY 115-VWtRING
NOTE 2
FIVE WIRE --_
THREE-W RE
HEATING-ONLY NNN:
BLOWER DOOR SWITCH
O @
.... T
115_V FIELD_ AUXIUARY i @-')-
SUPPLIED J-BOX @
DISCONNECT @.
24-V
TERMINAL
BLOCK
FURNACE
THERMOSTAT
TERMINALS
CONDENSING
UNIT
TWO
WIRE
FIELD-SUPPLIED
DISCONNECT
208/230-OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
NOTES: 1. ConnectY-terminal in furnace as shown for proper blower operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
A02174
Fig. 27--Heating and Cooling Application Wiring Diagram
2O
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