Flue And Intake Hoods; High Altitude Derate - Lennox LCH036 Installation Instructions Manual

PRESSURE TEST GAS LINE
MANUAL MAIN
SHUT-OFF VALVE
GAS VALVE
FIGURE 14
CAUTION
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or othe sources of ignition
to check for gas leaks.
WARNING
Danger of explosion. Can cause injury
or product or property damage. Do not
use matches, candles, flame or other
sources of ignition to check for leaks.

Flue and Intake Hoods

Hoods are shipped in the gas heat section. Install as shown
in figure 15. Secure with screws provided.
Two grommets are also shipped with the hood assemblies
for gas piping knockouts. Install one grommet in the gas
piping entry knockout. Install the other grommet in the heat
section division panel knockout.
SHIPPING COVERS OVER
CAP

High Altitude Derate

Locate the high altitude conversion sticker in the unit
literature bag. Fill out the conversion sticker and affix next to
the unit nameplate.
Refer to table 1 for high altitude adjustments.
2000-4500
4500 And Above
*Units installed at 0-2000 feet do not need to be modified.
NOTE ‐ This is the only permissible derate for these units.
Page 12
INSTALL EXHAUST AND INTAKE HOODS
REMOVE AND DISCARD
EXHAUST OPENINGS
FIGURE 15
TABLE 1
HIGH ALTITUDE DERATE
Altitude Ft.*
Derate 4% / 1000 Ft. Above Sea Level
LGH/LCH420, 480, 540, 600
EXHAUST
HOODS
INTAKE
HOOD
Gas Manifold Pressure
See Unit Nameplate