Electrical Connections - Carrier 58CTA Installation And Service Instructions Manual

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Table 6—Maximum Capacity of Pipe*
NOMINAL
IRON INTERNAL
PIPE DIAMETER
SIZE (IN.)
(IN.)
1/2 0.622
3/4 0.824
1 1.049
1-1/4 1.380
1-1/2 1.610
* Cubic ft of natural gas per hr for gas pressures of 0.5 psig (14–in. wc) or less
and a pressure drop of 0.5–in wc (based on a 0.60 specific gravity gas).
Ref: Table 12.2 ANSI Z223-2002/NFPA 54-2002.
Refer to Table 6 for recommended gas pipe sizing. Risers must be
used to connect to furnace and to meter. Support all gas piping
with appropriate straps, hangers, etc. Use a minimum of 1 hanger
every 6 ft. Joint compound (pipe dope) should be applied sparingly
and only to male threads of joints. Pipe dope must be resistant to
the action of propane gas.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use a
connector which has previously served another gas appliance.
Black iron pipe shall be installed at the furnace gas control
valve and extend a minimum of 2 in. outside the furnace.
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FURNACE OVERHEAT HAZARD
Failure to follow this caution may result in property damage.
Connect gas pipe to furnace using a backup wrench to avoid
damaging gas controls and burner misalignment.
An accessible manual equipment shutoff valve MUST be installed
external to furnace casing and within 6 ft of furnace. A 1/8-in. NPT
plugged tapping, accessible for test gauge connection, MUST be
installed immediately upstream of gas supply connection to
furnace and downstream of manual equipment shutoff valve.
NOTE: The furnace gas control valve inlet pressure tap connec-
tion is suitable to use as test gauge connection providing test
pressure DOES NOT exceed maximum 0.5 psig (14-in. wc) stated
on gas control valve. (See Fig. 52.)
Some installations require gas entry on right side of furnace (as
viewed in upflow). (See Fig. 21a.)
90° Elbow
2" Nipple
Street Elbow
Gas Valve
Fig. 21a—Right Side Gas Entry Example
LENGTH OF PIPE (FT)
10 20 30 40
175 120 97 82
360 250 200 170
680 465 375 320
1400 950 770 660
2100 1460 1180 990
A02327
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
50
(REQUIRED
SEDIMENT
73
TRAP
151
285
580
900
Fig. 21b—Typical Gas Pipe Arrangement
Install a sediment trap in riser leading to furnace as shown in Fig
21b. Connect a capped nipple into lower end of tee. Capped nipple
should extend below level of furnace gas controls. Place a ground
joint union between furnace gas control valve manifold and
exterior manual equipment gas shutoff valve.
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A 1/8-in. NPT plugged tapping, accessible for test gauge connec-
tion, MUST be installed immediately upstream of gas supply
connection to furnace and downstream of manual equipment
shutoff valve.
Piping should be pressure and leak tested in accordance with
NFGC in the United States or NSCNGPIC in Canada, local, and
national plumbing and gas codes before the furnace has been
connected. After all connections have been made, purge lines and
check for leakage at furnace prior to operating furnace.
If pressure exceeds 0.5 psig (14-in. wc), gas supply pipe must be
disconnected from furnace and capped before and during supply
pipe pressure test. If test pressure is equal to or less than 0.5 psig
(14-in. wc), turn off electric shutoff switch located on furnace gas
control valve and accessible manual equipment shutoff valve
before and during supply pipe pressure test. After all connections
have been made, purge lines and check for leakage at furnace prior
to operating furnace.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the furnace burners ON and OFF.

ELECTRICAL CONNECTIONS

ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in serious personal
injury or death.
Blower access panel door switch opens 115-v power to
control. No component operation can occur. Do not bypass or
close switch with panel removed.
See Fig. 22 for field wiring diagram showing typical field 115-v
wiring. Check all factory and field electrical connections for
tightness.
Field-supplied wiring shall conform with the limitations of 63°F
(33°C) rise.
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UNION
A02035