8
D’installation de ce générateur de chaleur à des altitudes
supérieures à 2000 pi (610 m) doit être effectuée conformé
-
ment auxinstructions accompagnant la trousse de conver-
sion pour haute altitude fournie avec cet appareil.
IMPORTANT NOTE:
The gas/electric units naturally derate
with altitude. Do not attempt to increase the firing rate by
changing orifices or increasing the manifold pressure. This
can cause poor combustion and equipment failure. At all alti-
tudes, the manifold pressure must be within 0.3 inches W.C.
of that listed on the nameplate for the fuel used. At all alti-
tudes and with either fuel, the air temperature rise must be
within the range listed on the unit nameplate. Contact your
distributor or refer to the specification sheet for your model
for listing of approved high altitude conversion kit(s). Refer
to the Installation Manual provided with the high altitude kit
for altitude adjustments.
NOTE:
No changes are required up to 2,000 feet. Use the
appropriate high altitude kit above 2,000 feet.
Piping
IMPORTANT NOTE:
To avoid possible unsatisfactory opera-
tion or equipment damage due to under firing of equipment,
do not undersize the natural/propane gas piping from the
meter/tank to the unit. When sizing a trunk line, include all
appliances on that line that could be operated simultaneously.
The rating plate is stamped with the model number, type of
gas and gas input rating. Make sure the unit is equipped to
operate on the type of gas available. The gas line installa-
tion must comply with local codes, or in the absence of local
codes, with the latest edition of the National Fuel Gas Code
NFPA 54/ANSI Z223.1.
Natural Gas Connection
Refer to the Proper Piping Practice drawing for the general
layout at the unit. The following rules apply:
1.
Use black iron pipe and fittings for the supply piping.
The use of a flex connector and/or copper piping is per
-
mitted as long as it is in agreement with local codes.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum of
three inches long.
5. Use two pipe wrenches when making connection to the
gas valve to keep it from turning.
6.
Install a manual shut-off valve in a convenient location
(within six feet of unit) between the meter and the unit.
7. Tighten all joints securely.
8. The unit must be connected to the building piping by
one of the following methods:
•
Rigid metallic pipe and fittings
•
Semirigid metallic tubing and metallic fittings (Alumi
-
num alloy tubing must not be used in exterior locations)
• Listed gas appliance connectors used in accordance
with the terms of their listing that are completely in the
same room as the equipment
• In the prior two methods above the connector or tubing
must be protected from physical and thermal damage.
Aluminum alloy tubing and connectors must be coated
to protect against external corrosion when in contact
with masonry, plaster or insulation or are subject to re-
peated wettings by liquids (water - not rain water, de
-
tergents or sewage).
NOTE:
The unit gas supply entrance is factory sealed with
plugs. Keep plugs in place until gas supply is ready to be
installed. Once ready, replace the plugs with the supplied
grommets and install gas supply line.
Length of
Pipe in Feet
1/2
3/4
1
1 1/4
1 1/2
10
132
278
520
1050
1600
20
92
190
350
730
1100
30
73
152
285
590
980
40
63
130
245
500
760
50
56
115
215
440
670
60
50
105
195
400
610
70
46
96
180
370
560
80
43
90
170
350
530
90
40
84
160
320
490
100
38
79
150
305
460
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 Specific Gravity Gas)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size (inches)
BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
CFH =
Proper Piping Practice
Gas Piping Checks
There will be air in the gas supply line after testing for leaks
on a new installation. Therefore, the air must be bled from
the line by loosening the ground joint union until pure gas is
expelled. Tighten union and wait for five minutes until all gas
has been dissipated in the air. Be certain there is no open
flame in the vicinity during air bleeding procedure. The unit
is placed in operation by closing the main electrical discon-
nect switch for the unit.
