17
LDAP-IOM (01-22) 207733-A
•
•
The 1/8-inch plugged tapping in the manual shutoff valve in
provides connection for a supply line pressure
test gauge .
•
The National Fuel Gas Code requires the installation of a trap with a minimum 3-inch drip leg (see
) . Local
codes may require a drip leg longer than 3 inches (typically 6 inches) . To permit burner removal, this drip leg must
extend beyond the edge of the heater .
•
Leak-test all connections by brushing on a leak-detecting solution . Bleed trapped air from gas lines as needed .
•
The gas connection is made at the pipe nipple that extends outside the cabinet, as shown in
. Gas
connection sizes are listed in
.
Table 8. Gas Connection Sizes
Unit Size
Natural Gas
Propane
Connection (Inches)
*
400
1
1
800, 1200
1-1/4
1-1/4
*
Connection size for a standard unit (not gas supply line size) .
Figure 9. Gas Connections
Venting Connections
⚠ DANGER ⚠
• Each heater requires its own individual vent pipe run and vent cap. Manifolding of vent runs can
cause recirculation of combustion products into the building. Failure to comply could result in
severe personal injury or death and/or property damage.
• If this heater is replacing an existing heater, be sure that the vent is sized properly for the heater
being installed and that the existing vent is in good condition.
• A properly sized vent system is required for safe operation of the heater. An improperly sized
vent system can cause unsafe conditions and/or create condensation.
• Do not intermix different vent system parts from different manufacturers in the same venting
system.
• Do not vent into an existing gravity vent or chimney.
