High-Altitude Application - Heat Controller 80+ AFUE Installation Instructions Manual

AVERTISSEMENT:
RISQUE D'INDENDIE OU D'EXPLOSION
Le non-respect des avertissements de sécurité
pourrait d'entraîner des blessures graves, la
mort ou des dommages matériels.
Ne jamais utiliser une flamme nue por
vérifier la présence des fuites de gaz. Pour
la vérification de tous les joints, utiliser
plutôt une solution savonneuse commerciale
fabriquée spécifiquement pur la détection des
fuites de gaz. Un incendie ou une explosion
peut entraîner des dommages matériels, 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 pressure testing gas supply
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
High altitude conversion with this furnace depends on
the installation altitude and the heating value of the gas.
Installation of this furnace at altitudes above 2,000 feet
shall be in accordance with local codes, or in the absence
of local codes, the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 or National Standard of Canada, Natural Gas &
Propane Installation Code 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 2,000 feet, the NFGC requires that this
appliance be derated 4% for each 1,000 feet of altitude.
For example, at 2,000 feet the input needs to be reduced
8%, at 3,000 feet (12%), 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 across regions
and is expressed as the "sea level heating value".
2. The heating value varies by altitude. For this reason,
especially in high altitude areas, the local gas utility
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 HIGH or LOW heating values
at sea level. Tables 9 & 10 (page 33) contain the orifice
sizes and manifold pressure to use at various altitudes.
Table 9 (High) is for natural gas installations with a heating
value of more than 1,000 Btu per cubic foot and Table
10 (Low) is for less than 1,000 Btu per cubic foot. To
determine which table to use:
1. Consult the local utility for the local heating value at
your installation site.
2. From Table 8 (page 32), 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 9 or
if it's LOW, use Table 10 (page 33).
Installation Example
Elevation: .................................................. 5,000 feet
Type of Gas: ........................................... Natural Gas
Local Heating Value of Gas: .............................. 750
From Table 8, find 750 and follow down the column,
stop at the 5,000 feet row. The heating value listed is
LOW. Table 10 will be used to determine orifice size
and manifold pressure.
After changing the regulator pressure or 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 and
Adjusting the Input Rate section (page 22).
NOTE: Observe the action of the burners to make sure
there is no yellowing, lifting or flashback of the flame.
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