11
Table 2—
Maximum Gas Flow Capacity*
NOMINAL
IRON PIPE
SIZE (IN.)
INTERNAL
DIAMETER
(IN.)
LENGTH OF PIPE (FT)†
10
20
30
40
50
60
70
80
90
100
125
150
175
200
1/2
.622
175
120
97
82
73
66
61
57
53
50
44
40
—
—
3/4
.824
360
250
200
170
151
138
125
118
110
103
93
84
77
72
1
1.049
680
465
375
320
285
260
240
220
205
195
175
160
145
135
1--1/4
1.380
1400
950
770
600
580
530
490
460
430
400
360
325
300
280
1--1/2
1.610
2100
1460
1180
990
900
810
750
690
650
620
550
500
460
430
*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
TEE
NIPPLE
CAP
IN
C99020
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.
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.
!
WARNING
8. Check for gas leaks at the field--installed and
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).
Step 9—Install Electrical Connections
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.
!
WARNING
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.
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.
!
CAUTION
48D
U