Gas Piping - Carrier N92ESN Installation, Start-Up, Operating And Service And Maintenance Instructions

N92ESN: Installation, Start-up, Operating and Service and Maintenance Instructions

GAS PIPING

WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
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. A
fire or explosion may result causing property damage, personal injury
or loss of life.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Use proper length of pipe to avoid stress on gas control manifold and
gas valve.
WARNING
!
FIRE OR EXPLOSION HAZARD
Gas valve inlet and/or inlet pipe must remain capped until gas supply
line is permanently installed to protect the valve from moisture and
debris. Also, install a sediment trap in the gas supply piping at the inlet
to the gas valve.
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the U.S.A. Refer to current
edition of NSCNGPIC in Canada.
Installations must be made in accordance with all authorities having
jurisdiction. If possible, the gas supply line should be a separate line
running directly from meter to furnace.
NOTE: Use a back-up wrench on the inlet of the gas valve when
connecting the gas line to the gas valve.
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in furnace damage.
Connect gas pipe to furnace using a backup wrench to avoid damaging
gas controls and burner misalignment.
!
In the state of Massachusetts:
1. Gas supply connections MUST be performed by a licensed plumber
or gas fitter.
2. When flexible connectors are used, the maximum length shall not
exceed 36 in. (915 mm).
3. When lever handle type manual equipment shutoff valves are used,
they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT approved by the state
of Massachusetts.
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
NOTICE
Gas entry can be from left or right side, or top panel. See
Fig. 30.
Left Side Gas Entry. Gas Pipe
Grommet Required For Direct
Vent Applications.
Fig. 29 – Gas Entry
Fig. 30 – Alternate Gas and Electric Entry
NOTE: Top plate may be field drilled for alternate gas and 115 VAC
Refer to Table 9 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 one hanger every 6
ft. (2 M). 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.
Table 9 – Maximum Capacity of Pipe
NOMINAL
IRON PIPE
SIZE
10 (3.0)
IN. (MM)
1/2 (13) 175
3/4 (19) 360
1 (25) 680
1-1/4 (32) 1400
1-1/2 (39) 2100
* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. w.c.) or less and a pressure drop of
0.5-in. w.c. (based on a 0.60 specific gravity gas). Ref:
of NFPA54/ANSI Z223.1.
Gas Pressure Natural (in W.C.)
Maximum
Minimum
When a flexible connector is used, black pipe shall be installed at the
furnace gas control valve and extend a minimum of 2-in. (51 mm)
outside the furnace.
For direct vent (2-pipe) applications, seal the gas pipe knockout to
prevent air leakage.
Remove the required knockout. Install the grommet in the knockout.
Then insert the gas pipe. The grommet is included in the loose parts bag.
Piping should be pressure and leak tested in accordance with the current
addition of the NFGC in the United States, local, and national plumbing
and gas codes before the furnace has been connected.
22
Gas Pipe Grommet Required
For Direct Vent Applications
1 1/2 inch for Gas
7/8 inch for 115 VAC Electric
electric entry.
LENGTH OF PIPE - FT (M)
20 (6.0) 30 (9.1) 40 (12.1)
120 97 82
250 200 170
465 375 320
950 770 660
1460 1180 990
Table 9 above and 6.2 current edition
Propane (in W.C.)
13.8
4.5" 12"
Fig. 29 and
A11338
A170125
50 (15.2)
73
151
285
580
900