23
! WARNING:
Products of combustion must not be
allowed to enter the return air ductwork or
the circulating air supply. Failure to pre-
vent products of combustion from being
circulated into the living space can create
potentially hazardous conditions includ-
ing carbon monoxide poisoning that
could result in personal injury or death.
All return ductwork must be secured to
the furnace with sheet metal screws. For
installations in confined spaces, all re-
turn ductwork must be adequately sealed
and joints must be taped. When return air
is provided through the bottom of the
furnace, the joint between the furnace
and the return air plenum must be air
tight.
The floor or platform on which the fur-
nace is mounted must provide sound
physical support of the furnace with no
gaps, cracks, or sagging between the
furnace and the floor or platform.
Return air and circulating air ductwork
must not be connected to any other heat
producing device such as a fireplace in-
sert, stove, etc. Doing so may result in fire,
explosion, carbon monoxide poisoning,
personal injury, or property damage.
GAS SUPPLY AND PIPING
General
This furnace may be installed for either left or
right side gas entry. A typical gas service
hookup is shown in Figure 24. When making the
gas connection provide clearance between the
gas supply line and the entry hole in the furnace
casing to avoid unwanted noise and/or damage
to the furnace.
All gas piping must be installed in compliance
with local codes and utility regulations. Some
local regulations require the installation of a
manual main shut-off valve and ground joint
union external to the furnace. The shut-off valve
should be readily accessible for service and/or
emergency use. Consult the local utility or gas
supplier for additional requirements regarding
placement of the manual main gas shut-off. In
the absence of local codes the gas line instal-
lation must comply with the latest edition of the
National Fuel Gas Code (ANSI Z223.1) or (CAN/
CGA B149.1 or .2) Installation Codes.
An 1/8 inch NPT tap must be installed in the gas
line to the unit for use when measuring the gas
supply pressure. The tap should be readily
accessible for service use. A drip leg should be
installed in the vertical pipe run to the unit. Table
5 lists gas flow capacities for standard pipe sizes
as a function of length in typical applications
based on nominal pressure drop in the line.
IMPORTANT NOTES:
1. Gas piping must not be run in or through air
ducts, chimneys, gas vents, elevator shafts,
etc.
2. Compounds used on threaded joints of gas
piping must be resistant to the actions of liquefied
petroleum gases.
3. The main manual gas valve and main power
disconnect to the furnace must be properly
labeled by the installer in case emergency
shutdown is required.
Leak Check
After the gas piping to the furnace is complete,
all connections must be tested for gas leaks. To
check for leaks in gas piping systems, use only
a soap and water solution or other approved
method.
Table 5. Capacity of Black Iron Gas Pipe
(cu. ft. per hour) for Natural Gas
(specific gravity = .60)
NOMINAL
LENGTH OF PIPE RUN
BLACK IRON
(feet)
PIPE DIAMETER
(in.)
10
20
30
40
50
60
70
80
1/2
130
90
75
65
55
50
45
40
3/4
280
190
150
130
115
105
95
90
1
520
350
285
245
215
195
180
170
1 1/4
1050
730
590
500
440
400
370
350
1 1/2
1600
1100
890
760
670
610
560
530
The cubic feet per hour listed in the table above must be greater than the cubic feet
per hour of gas flow required by the furnace.
To determine the cubic feet per hour of gas flow required by the furnace, divide the
input rate of the furnace by the heating value of the gas:
Cubic Feet Per Hour Required Input To Furnace (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
Summary of Contents for TA-060C-08A
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