Gas Heater Connection And Startup - LG AR-DR11-08A Installation And Operation Manual

GAS HEATER CONNECTION AND STARTUP

Gas Heater Connection and Startup
DANGER
Gas pipes must be sized and installed in accordance with applicable codes and by qualified personnel. Authorities having jurisdiction must be con-
sulted before installing and connecting gas lines. Improper installation by the user may result in fire, explosion, physical injury or death.
Gas furnaces are designed for gas pressure of 5 to 13.5 in. w.c. for natural gas (six [6] inch minimum on single 500 and 600 MBH furnaces)
and 11 to 13.5 in. w.c. for LP. If the gas pressure at the job location is greater than 13.5 in. w.c., an additional regulator is required to reduce
pressure.
Gas Connection Sizes
All gas furnace sections require one (1), two (2), or three (3) gas
connections (usually 3/4 in. NPT) based on the total heating capacity
as shown in the chart.
Flue Venting (Outdoor Installations)
The venting system is designed for direct discharge of flue gases to
the outdoors. The vent discharge opening must be located to provide
an unobstructed discharge to the outside, and must be located as far
from the combustion air inlet as possible, but in the same pressure
zone. Vent duct must pitch down toward outlet, to ensure that any
condensate that occurs in vent duct drains away from combustion
blower fan housing. The duct opening must be protected by 1/2 in x
1/2 in. mesh screen. An optional rain hood may be used over the dis-
charge opening to prevent wind driven rain from entering the vent duct,
but must not intersect the flue gas discharge port. See below.
Figure 39: Outdoor Horizontal Venting Diagram.
WARNING
Combustion air inlet cover must be extended and opened prior to starting the gas heat. Inadequate ventilation is a health hazard that may result in
physical injury or death.
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Table 16: Gas Connection Sizes.
Total Heating Capacity
(Input in MBH)
100
150
200
250
300
350
400
500
600
800
1,000
1,200
Gas Connections
(3/4 in. NPT unless noted)
1
1
1
1
1
1
1
1 @ 1 in. NPT
1 @ 1 in. NPT
2 for 31-XX Chassis
1 @ 2 in. NPT for 35-XX Chassis
1 @ 2 in. NPT
1 @ 2 in. NPT
33