StyleCrest Installation Manual

15
This furnace may be installed with left, right, or bottom gas
entry. When connecting the gas supply, 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. Typical gas service hookup for this furnace
is shown in Figure 26.
Table 9, (page 23) 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:
• Some local regulations require the installation of a
manual main shut-off valve and ground joint union
external to the furnace. See Figure 26. 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.
• Per ANSI 21.47, A 1/8-inch NPT plugged tapping,
accessible for test gauge connection, must be
installed immediately upstream of the gas supply
connection to the furnace external to the cabinet.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do
not use a connector that has previously serviced
another gas appliance.
• Gas piping must never run in or through air ducts,
chimneys, gas vents, or elevator shafts.
• Compounds used on threaded joints of gas piping
must be resistant to the actions of -liquefied
petroleum gases.
Floor
Control
Panel
On-Off-Fan
Switch
Alt. Fuel
Line Entry
Floor Cavity
Some codes may require 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.
To Gas Supply
Figure 26. Typical Gas Piping
• The main gas valve and main power disconnect to
the furnace must be properly labeled by the installer
in case emergency shutdown is required.
• Flexible gas connectors are not recommended for
this furnace but may be used if allowed by local
jurisdiction. Only new flexible connectors may be
used. DO NOT reuse old flexible gas connectors.
• A drip leg is recommended for a vertical run to the
unit.
• All piping shall be black iron pipe. Internally tinned
copper tubing may be used for gas supply systems.
• Fuel line installations other than typical installations
shown in Figure 26 must comply with the fuel piping
provisions stated in the Federal Manufactured Home
Standard (H.U.D. TITLE 24, PART 3280) and the
National Fuel Gas Code (ANSI-Z223.1/NFPA-54).
• Shut-off valve must be designed and listed for use
with liquid petroleum (L.P. gas).
• Plugged tappings (1/8” NPT) for test gauge
connection are present on the gas valve. See Figure
27 for locations.
NOTE: Optional fuel inlet lines are available for all gas
furnace models to permit the addition of a 1/2” F.P.T.
shut-off valve above the floor.
The gas supply to your home will either be Natural Gas
or L.P. Your furnace is factory equipped to operate on
Natural Gas. If your gas supply is L.P., you must contact
a qualified serviceman or gas supplier to convert the
furnace. Instructions for conversion to propane are shown
on page 17. Factory installed orifice sizes are listed in
Table 6, (page 16).
For natural gas operation, the maximum inlet pressure
for the valve is 7” W.C and the minimum inlet pressure
is 4.5” W.C. Pressure is reduced to 3 1/2” W.C. by the
pressure regulator in the gas valve.
For LP gas, pressure to the gas valve must be more than
11” W.C. but not more than 13” W.C. Pressure is reduced
to 10” W.C. by the pressure regulator in the gas valve.
Figure 27. Honeywell Gas Valve
PRESSURE
REGULATOR
CAP
N
A
T
N
A
T
N
A
T
N
A
T
L
P
L
P
OR
OTHER SIDE
OF CAP
OUTLET PRESSURE
TAP (1/8 NPT)
INLET PRESSURE
TAP (1/8 NPT)