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AVERTISSEIVlENT:
RISQUE
D'INDENDIE
OU D'EXPLOSION
Le
non=respect
des
avertissements
de
s_curit_
pourrait
d'entra_ner
des blessures
graves,
la mort ou des dommages
materiels.
Ne jamais utiliser
une flamme nue pot verifier la
presence des fuites
de gaz. Pour la verification
de tous les joints, utiliser plut6t une solution
savonneusecommercialefabriqueespecifiquement
pur la detection des fuites de gaz. Un incendie ou
une explosion
peut entra_ner des dommages
materiels, des blessures
ou la mort.
After the gas piping to the furnace
is complete,
all
connections must be tested for gas leaks. This includes
pipe connections at the main gas valve, emergency shutoff
valve and flexible gas connectors (if applicable).The soap
and water solution can be applied on each joint or union
using a small paintbrush. If any bubbling is observed,
the connection
is not sealed adequately
and must be
retightened. Repeat the tightening and soap check process
until bubbling ceases.
IMPORTANT NOTE:When pressuretesting
gassupply
lines at pressures
greater than 1/2 psig (14 inch W.C.),
the gas supply piping system must be disconnected
from the furnace to prevent damage to the gas control
valve. If the test pressure is less than or equal to 1/2
psig (14 inch W.C.), close the manual shut-off
valve.
High Altitude
Application
The installation of this furnace at altitudes above 2,000
feet must meet the requirements of the National Fuel Gas
Code or local jurisdiction. In Canada, the requirements for
high altitude are different and governed by CGA B149.1.
Please consult your local code authority.
WARNING:
The reduction
of input rating
necessary
for high
altitude
installation
may only be accomplished
with factory
supplied orifices.
Do not attempt
to
drill out orifices
in the field,
improperly
drilled
orifices
may
cause
fire,
explosion,
carbon
monoxide
poisoning,
personal
injury
or death.
The furnaces are shipped from the factory with orifices
and gas regulator settings for natural gas operation at sea
level altitudes. At 2000 feet, the NFGC requires that this
appliance be derated 4% for each 1000 feet of altitude.
For example, the input needs to be reduced 8% at 2,000
feet, 12% at 3,000 feet, etc. This deration is in reference
to the input rate and gas heating value at sea level.
To derate the furnace requires knowing the heating value of
the gas at the installation site. Heating values at particular
job sites vary for two reasons:
1. The chemical mixture of the gas varies from region
to region and is expressed as the "sea level heating
value".
2. The heating value varies by altitude. For this reason,
particularly in high altitude areas, the local gas utility
usually specifies the heating value at the residence's
gas meter as the "local value".
For added flexibility, two tables have been provided for
natural gas installations with _
or low heating values at
sea level. Tables 15 and 16 (page 39) contain the orifice
sizes and manifold pressure to use at various altitudes.
Table 15 (HIGH) is for natural gas installations with a
heating value of more than 1,000 Btu per cubic foot and
Table 16 (LOW) is for less than 1,000 Btu per cubic foot.
To determine which table to use:
1. Consult your local utility for the local heating value at
your installation.
2.
From Table 14 (page 38), find your local heating value
as supplied by the utility company. Follow down the
column and stop at your altitude level.
3.
If your sea level heating value is HIGH, use Table 15
or if it's LOW, use Table 16. See example.
Installation
Example
Elevation:
..................................................
5,000 feet
Type of Gas: ...........................................
Natural Gas
Local Heating Value of Gas: .............................. 750
From Table 14, find 750 and follow down the column,
stop at the 5,000 feet row. The heating value listed is
LOW. Table 16 will be used to determine orifice size and
manifold pressure.
After changing the regulator pressure or changing the
orifices, it is required that you measure the gas input rate.
This may be accomplished in the usual way, by clocking
the gas meter and using the local gas heating value. See
Verifying & Adjusting the Input Rate section (page 28).
IMPORTANT NOTE: Observe the action of the burners
to make sure there is no yellowing,
lifting or flashback
of the flame.
22
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