International comfort products R9MSB0801716 Installation Instructions Manual page 31

INSTALLATION INSTRUCTIONS
WARNING
!
FIRE OR EXPLOSION HAZARD
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.
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.
Table 9 – Maximum Capacity of Pipe
NOMINAL LENGTH OF PIPE − FT (M)
IRON
10 20
PIPE SIZE
(3.0) (6.0)
IN. (MM)
1/2 (13) 175 120
3/4 (19) 360 250
1 ( 25) 680 465
1-1/4 (32) 1400 950
1-1/2 (39) 2100 1460
* 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:
Table 9 above and 6.2 current edition of the NFPA54/ANSI Z223.1.
An accessible manual equipment shutoff valve MUST be
installed external to furnace casing and within 6 ft. (1.8 M) of
furnace.
Install a sediment trap in riser leading to furnace as shown in
Figure 32. 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.
GAS
SUPPLY
MANUAL
SHUT OFF
VALVE
(REQUIRED)
UNION
SEDIMENT
TRAP
Figure 32 − Typical Gas Pipe Arrangement
440 01 6001 05
30 40 50
(9.1) (12.1) (15.2)
97 82 73
200 170 151
375 320 285
770 660 580
1180 990 900
FRONT
NOTE: Union may be inside the
vestibule where permitted by
local codes.
A11035
Specifications subject to change without notice.
A 1/8−in. (3 mm) 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.
Piping should be pressure and leak tested in accordance with
the current edition of the NFGC in the United States, local, and
national plumbing and gas codes before the furnace has been
connected. Refer to current edition of the NSCNGPIC in
Canada. After all connections have been made, purge lines
and check for leakage at furnace prior to operating furnace.
NOTE: The furnace gas control valve inlet pressure tap
connection is suitable to use as test gauge connection
providing test pressure DOES NOT exceed maximum 0.5 psig
(14−in. w.c.) stated on gas control valve.
ON/OFF Switch
1/2" NPT Inlet
1/8" NPT Inlet
Pressure Tap
Figure 33 − Gas Valve
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
Figure 34 and Figure 35)
Gas Pipe Grommet
For direct vent (2-pipe) applications, the knockout for the gas
pipe must be sealed to prevent air leakage. Remove the
knockout, install the grommet in the knockout, then insert the
gas pipe. The grommet is included in the loose parts bag. See
Figure 34.
Left Side Gas Entry. Gas Pipe
Grommet Required For Direct
Vent Applications.
Figure 34 − Gas Entry
Gas Furnace: R9MSB
SINGLE-STAGE
Regulator Seal Cap
Regulator Adjustment
Regulator Seal Cap under Cap
1/2" NPT Outlet
1/8" NPT Manifold
Pressure Tap
A11153
Gas Pipe Grommet Required
For Direct Vent Applications
A11338
31