High Alititue Derate; Pressure Test Gas Piping - Lennox LGH036, LGH048, LGH060, LGH072, LGH074 Installation Instructions Manual

HONEYWELL VR9205 GAS VALVE
MANIFOLD PRESSURE ADJUSTMENT
(TURN CCW TO INCREASE PRESSURE)
NEGATIVE AIR
PRESSURE PORT
INLET
SUPPLY
PRESSURE
TAP
GAS VALVE SHOWN IN THE ON POSITION
FIGURE 8
OUTSIDE OF UNIT GAS PIPE CONNECTION
GROUND
JOINT UNION
TO GAS
SUPPLY
GAS PIPING
SUPPORT
MANUAL MAIN
SHUT-OFF VALVE
FIGURE 9

High Alititue Derate

Locate the high altitude conversion sticker in the unit liter-
ature bag. Fill out the conversion sticker and affix next to
the unit nameplate.
Refer to table 1 for high altitude adjustments.
HIGH ALTITUDE DERATE
Altitude Ft.*
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.
LGH036-360 Agency
POSITIVE AIR
PRESSURE PORT
MANIFOLD
PRESSURE TAP
TO GAS
VALVE
DRIP LEG
(REFER TO
LOCAL CODES)
TABLE 1
Gas Manifold Pressure
See Unit Nameplate
Derate 2% / 1000 Ft. Above Sea Level
BOTTOM ENTRY GAS PIPING COMPLETED
STREET
ELBOW
OUTLET
7" NIPPLE
2-1/2" NIPPLE
DRIP LEG
Grommets for both gas pipe openings are field provided.
High Altitude Derate - ULNOx Units
Ultra-Low NOx units are approved for installations from 0
-4500 ft. No modifications are required. Above 2000 ft, the
furnace will naturally de-rate approximately 10%.

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
Model
KG/KD 024-090
KG/KD 092-300
When testing the pressure of gas lines, the gas valve must
be disconnected and isolated. Gas valves can be dam-
aged if subjected to more than 0.5 psig.
Page 4
GROUND
JOINT UNION
MANUAL MAIN
SHUT-OFF VALVE
FIGURE 10
TABLE 2
Natural Gas
Min. Max.
4.5 10.5
4.7 10.5
WARNING
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 specifically for the
detection of leaks to check all connections. A
fire or explosion may result causing property
damage, personal injury or loss of life.
TO GAS
VALVE
TO GAS
SUPPLY
LP/ Propane Gas
Min Max.
11 13
11 13