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NOMINAL
INTERNAL
IRON PIPE
IRON PIPE
DIAMETER
DIAMETER
SIZE (IN.)
(IN.)
1/2
.622
3/4
.824
1
1.049
1- - 1/4
1.380
1- - 1/2
1.610
*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5- -in. wg (based on a 0.60 specific gravity gas). Refer to Table, National Fire Protec-
tion Association NFPA 54.
{ This length includes an ordinary number of fittings.
OUT
Fig. 10 - - Sediment Trap
7. Pressure test all gas piping in accordance with local and
national plumbing and gas codes before connecting piping
to unit.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must be
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig. Pressure test the
gas supply piping system at pressures equal to or less than 0.5 psig.
The unit heating section must be isolated from the gas piping system
by closing the external main manual shutoff valve and slightly
opening the ground- -joint union.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in fire, explosion,
personal injury, death and/or property damage.
S
Connect gas pipe to unit using a backup wrench to avoid
damaging gas controls.
S
Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections.
S
Use proper length of pipe to avoid stress on gas control
manifold.
S
If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at
furnace gas valve and extend a minimum of 2 in. outside
furnace casing.
S
If codes allow a flexible connector, always use a new
connector. Do not use a connector which has previously
serviced another gas appliance.
8. Check
for gas leaks at the field- -installed
factory- -installed gas lines after all piping connections have
been completed. Use soap- -and- -water solution (or method
specified by local codes and/or regulations).
Table
2—Maximum Gas Flow Capacity*
10
20
30
40
175
120
97
82
360
250
200
170
680
465
375
320
1400
950
770
600
2100
1460
1180
990
IN
TEE
NIPPLE
CAP
C99020
and
LENGTH OF PIPE (FT)†
50
60
70
80
73
66
61
57
151
138
125
118
110
285
260
240
220
205
580
530
490
460
430
900
810
750
690
650
Step 9—Install Electrical Connections
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an electrical
wire connected to the unit ground screw in the control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA American
National Standards Institute/National Fire Protection
Association (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes.
HIGH- -VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a
field- -supplied, waterproof disconnect switch mounted at, or within
sight from, the unit. Refer to the unit rating plate, NEC and local
codes for maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing (See Table 3 for electrical data).
The field- -supplied disconnect may be mounted on the unit over the
high- -voltage inlet hole (See Fig. 5 and 6).
Operation of unit on improper line voltage constitutes abuse and
may cause unit damage that could affect warranty.
CAUTION
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit
being installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical
connections must be in accordance with CSA standard
C22.1 Canadian Electrical Code Part 1 and applicable local
codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field- -supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high- -voltage power to unit is within operating
voltage range indicated on unit rating plate.
4. Insulate low- -voltage wires for highest voltage contained
within conduit when low- -voltage control wires are in same
conduit as high- -voltage wires.
5. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduit, etc.
11
90
100
125
150
175
53
50
44
40
—
103
93
84
77
195
175
160
145
400
360
325
300
620
550
500
460
200
—
72
135
280
430
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