High Altitude Derate; Pressure Test Gas Piping; Table - Lennox LGH 036 Installation Instructions Manual

BOTTOM ENTRY GAS PIPING COMPLETED
GROUND
JOINT UNION
STREET
ELBOW
7" NIPPLE
2−1/2" NIPPLE
DRIP LEG
Grommets for both gas pipe openings are field provided.
FIGURE 7

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.

TABLE 1

HIGH ALTITUDE DERATE
Altitude Ft.*
2000−4500
4500 And Above Derate 2% / 1000 Ft. Above Sea Level
*Units installed at 0−2000 feet do not need to be modified.
NOTE - This is the only permissible derate for these units.
LGH036−360 Agency
TO GAS
VALVE
TO GAS
SUPPLY
MANUAL MAIN
SHUT−OFF VALVE
Gas Manifold Pressure
See Unit Nameplate

Pressure Test Gas Piping

Operating pressures at the unit gas connection must be
as shown in table 2.
OPERATING PRESSURE AT GAS CONNECTION w.c.
LGH036−072
LGH092−360
When testing the pressure of gas lines, the gas valve
must be disconnected and isolated. Gas valves can be
damaged if subjected to more than 0.5 psig.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could
result in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifi-
cally for the detection of leaks to check all connec-
tions. A fire or explosion may result causing prop-
erty damage, personal injury or loss of life.
Page 4
TABLE 2
Natural Gas LP / Propane Gas
Min. Max. Min.
4.5 10.5 11
4.7 10.5 11
WARNING
Max.
13.5
13.5