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98618/035-20009-001
Rev. B (1205)
CHECKING
THE GAS PRESSURES
1.
The pressure ports on the gas valve are marked OUT P and IN
R
2.
The manifold pressure must be taken at the port marked OUT R
3.
The inlet gas supply pressure must be taken at the port marked
IN R
4.
Using a 3/32" (0.2 cm) Allen wrench,
loosen the set screw by
turning it 1 turn counter
clockwise.
DO NOT REMOVE
THE
SET SCREW FROM THE PRESSURE
PORT.
5.
Push one end the 3/8" (0.9 cm) ID flexible tubing over the pres-
sure port so that the body of the port is inside the tubing.
6.
Use a reducer connector to connect the 3/8" (0.9 cm) ID flexible
tube to a 1/4" (0.9 cm) ID flexible tube that is connected to a "U"
tube manometer or digital pressure measuring equipment.
TABLE 6: Inlet Gas Pressure Range
INLET
GAS
PRESSURE
RANGE
Natural Gas
Propane
(LP)
Minimum
4.5" W.C. (1.12 kPa)
8.0" W.C. (1.99 kPa)
Maximum
10.5" W.C. (2.61 kPa)
13.0" (3,24 kPa) W.C.
IMPORTANT:
The inlet gas pressure operating range table specifies
the minimum and maximum gas line pressures required for safe fur-
nace operation.
The minimum
inlet gas pressure
required to obtain the BTU input
specified on the rating plate and in these instructions
is shown below:
4.5" W.C. (1.12 kPA) for Natural Gas
11.0" W.C. (2.74 kPA) for Propane (LP) Gas
GAS
ROOF JACK
SHUT-OFF
VENT CONNECTION
VALVE
BLOWER
DRIP
LEG
SWITCH
BURNER
SIGHT GLASS
j
GAS VALVE
HOT
I
SURFACE
IGNITOR
GROUND
UNION
BURNERS
_
LOWER
DOOR
SWITCH
_FURNACE
CONTROL
FIGURE 8: Gas Piping Configuration
GAS
PIPING
INSTALLATION
Properly sized wrought
iron, approved flexible or steel pipe must be
used when making gas connections
to the unit. If local codes allow the
use of a flexible gas appliance connection, always use a new listed con-
nector. Do not use a connector that has previously serviced another gas
appliance.
Some utility companies or local codes require pipe sizes larger than the
minimum sizes listed in these instructions and in the codes. The furnace
rating plate and the instructions
in this section specify the type of gas
approved for this furnace - only use those approved gases. The instal-
lation of a drip leg and ground union is required.
Refer to Figure 8.
IMPORTANT: An accessible
manual shutoff valve must be installed
upstream of the furnace gas controls and within 6 feet (1.8 m) of the fur-
Race.
The furnace
must be isolated from the gas supply piping system
by
closing its individual external manual shutoff valve during any pressure
testing of the gas supply piping system at pressures equal to or less
than 1/2 psig (3.5 kPa).
CAUTION
The gas valve body is a very thin casting that cannot take any
external pressure. Never apply a pipe wrench to the body of the gas
valve when installing piping. A wrench must be placed on the octa-
gon hub located on the gas inlet side of the valve. Placing a wrench
to the body of the gas valve will damage the valve causing improper
operation and/or the valve to leak.
Gas piping may be connected from either side of the furnace using any
of the gas pipe entry knockouts on both sides of the furnace. Refer to
Figure 8 Gas Piping Configuration.
GAS ORIFICE
CONVERSION
FOR PROPANE
(LP)
,&WARNING
The conversion
shaft be installed by a qualified service agency in
accordance
with the manufacturer's
instructions
and all applicable
codes and requirements
of the authority having jurisdiction.
If the
information
in these instructions
is not followed exactly, a fire, an
explosion
or production
of carbon monoxide
may result causing
property damage, personal injury or loss of life. The qualified ser-
vice agency is responsible
for the proper installation.
The installa-
tion is not proper and complete until the operation of the converted
appliance
is checked as specified
in the manufacturer's
instruc-
tions.
,&WARNING
Improper installation
may damage equipment,
can create a shock
hazard, and will void the warranty.
IMPORTANT:
These instructions are for the use of qualified individuals
specially trained, experienced
and certified in the installation of this type
of equipment and related system components.
Installation and service
personnel
are required
by some states to be licensed.
Persons not
qualified shall not install this equipment nor interpret these instructions.
NOTE: The words "Shall" or "Must" indicate a requirement,
which is
essential to satisfactory
and safe product performance.
NOTE: The words "Should"
or "May" indicate a recommendation
or
advice which is not essential and not required but which may be
useful or helpful.
CONTENTS
1.
Burner orifices for LP (propane) gas are located in bag attached to
the gas valve.
2.
Conversion
plate.
BURNER
GASVALVE
GAS
ORIFICE
GAS
MANIFOLD
FIGURE 9: Burner Assembly
8
Unitary Products Group
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