Carrier PG96MSA Installation, Start-Up, Operating And Service And Maintenance Instructions page 23

PG96MSA: Installation, Start-up, Operating and Service and Maintenance Instructions
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.
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
electric entry.
Refer to Table 10 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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
NOTICE
Fig. 29
Gas Pipe Grommet Required
For Direct Vent Applications
Table 10 – Maximum Capacity of Pipe
Nominal: 1/2 (12.7) 3/4 (19.0)
Actual ID: 0.622
Length (ft)
10 (3.0)
20 (6.0)
30 (9.1)
40 (12.1)
50 (15.2)
NOTE: Cubic ft. of natural 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: Chapter 6 current edition of ANSI
Z223/NFPA 54.
Gas Pressure
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 opening to prevent
air leakage.
Remove the required knockout or plug. Install the grommet in the
and
opening. 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 NFPA 54/ANSI Z223.1 in the United States, local, and
national plumbing and gas codes before the furnace has been connected.
Refer to current edition of NSCNGPIC in Canada. After all connections
have been made, purge lines and check for leakage at furnace prior to
operating furnace.
PRESSURE TESTING ABOVE ½ psig:
The furnace and it's individual shut-off valve must be disconnected from
the gas supply piping system during any pressure testing of that system
at test pressures in excess of ½ psig (3.5 kPa).
PRESSURE TESTING BELOW ½ psig:
A11338
The furnace must be isolated from the gas supply piping by closing its
individual manual shut-off valve during any pressure testing of the gas
supply piping system at test pressures equal to or less than ½ psig (3.5
kPa).
FIRE OR EXPLOSION HAZARD
A230050
A 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.
(51 mm) outside the furnace.
An accessible manual equipment shutoff valve MUST be installed
external to furnace casing and within 6 ft. (2 M) of furnace.
Install a sediment trap externally in the riser leading to furnace as shown
in Fig. 31. 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 and exterior manual equipment
gas shutoff valve.
23
1 (25.4)
0.824 1.049
Capacity in Cubic Feet of Gravity
172 360 678
118 247 466
95 199 374
81 170 320
72 151 284
Natural (in W.C.) Propane (in. w.c.)
13.8
4.5"
WARNING
!
1-1/4 1-1/2
(31.8) (38.1)
1.380 1.610
1390 2090
957 1430
768 1150
657 985
583 873
12"