High Altitude Derate; Download Mobile Service App - Lennox LGT156H Installation Instructions Manual

NOTE-Codes may require that manual main shut-off valve
and union (furnished by installer) be installed in gas line
external to unit. Union must be of the ground joint type.
After all connections have been made, check all piping
connections for gas leaks. Also check existing unit gas
connections up to the gas valve; loosening may occur
during installation. Use a leak detection solution or other
preferred means. Do not use matches candles or other
sources of ignition to check for gas leaks.
NOTE-In case emergency shut down is required, turn off
the main manual shut-off valve and disconnect main
power to unit. These devices should be properly labeled
by the installer.
PRESSURE TEST GAS LINE
MANUAL MAIN
SHUT-OFF VALVE
GAS VALVE
FIGURE 6
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.
LGT/LCT156, 180, 210, 240, 300

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. High altitude kits are available for
field-installation.
Refer to table 1 for high altitude adjustments.
2000-4500
169KBtuh
260-380 KBtuh
*Units installed at 0-2000 feet do not need to be modified.
CAP
NOTE ‐ This is the only permissible derate for these units.

Download Mobile Service App

A-Mobile Device Requirements
S Android hardware requires 2GB RAM and a 2Ghz
S Minimum Android 6.0 (Marshmallow) or higher.
Page 10
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.
TABLE 1
HIGH ALTITUDE DERATE
Unit Altitude Ft.*
2000-4500
4500 & Above
4500 & Above
core processor. Tablets are supported.
Recommend Android 10 and Apple products require
iOS version 11 or higher.
Gas Manifold Pressure
See Unit Nameplate
Derate 2% / 1000 Ft.
Above Sea Level
Derate 4% / 1000 Ft.
Above Sea Level