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iN401 - iN501 Gas
Connection
16
May
2019
-
Revision
00
6. Local codes may require multiple units to have a shut-off
valve on the main gas supply line and one on each unit.
6.9 Connecting Gas Line to Unit
Note
:
Always clean the inside of the gas line of any dirt or
debris before connecting the piping to the unit.
Main Supply
Line
Drip
Leg
Manual
Shut-off
Valve
Main Supply
Line
Drip
Leg
Drip
Leg
Drip
Leg
Drip
Leg
Manual
Shut-off
Valve
Manual
Shut-off
Valve
Manual
Shut-off
Valve
Manual
Shut-off
Valve
1. Install a 4-5/8” OD flanged steel coupling and gasket with
a short piece of 1-1/4” NPT black pipe.
2. Install a manual shut-off valve as described in “6.8 Gas
Pipe Drip Leg and Shut-off Valve” on page 15
Union
Shut-off
Valve
3. Install a drip leg in “6.8 Gas Pipe Drip Leg and Shut-off
Valve” on page 15.
4. Continue installing pipe to reach the main gas supply
connection.
5. Test all gas pipe connections.
a. All the gas pipe connections should be tested as
prescribed in NFPA 54.
b. In multiple unit applications, each unit should be
isolated before testing any piping system may exceed
the allowable pressure of 14.0” W.C..
NOTICE
Do not fire (operate) the water heater until all connections
have been completed and the heat engine is filled with
water.