Gas Pipe Connections - Biasi Riva Combi Installation & Operation Instructions

11. Gas Pipe Connections

Gas supply piping is to be sized and installed properly in order to provide a supply of gas sufficient
to meet the maximum demand without undue loss of pressure between the meter and the boiler.
Consult with the National Fuel Gas Code ANSI Z223.1 for proper sizing of gas piping for various
lengths and diameters.
Direction of flow
F
E
Figure 11.1
Locate a drop pipe adjacent to, but not in front of the boiler. Locate a tee (F) in the drop pipe at the
same elevation as the gas inlet connection to the boiler. Extend the drop line with a nipple towards
the floor and cap to form a sediment trap (E). Install a shut off valve (A) before the tee with
sediment trap and a union after the tee before the combination gas valve (D).
When installing the boiler, make sure a pipe compound resistant to the action of liquefied petroleum
is used. Check piping for leaks. Always check leaks with a water and soap solution.
The boiler and its gas connection must be leak tested before placing the boiler in operation. The
boiler and its individual shutoff valve must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5 kPa).
DO NOT USE A FLAME FOR CHECKING GAS LEAKS
RIVA COMBI MANUAL - REV B
A
B
C
D
WARNINGS
A) Manual T-handle Shutoff Valve
B) Pressure Gauge Port
C) Flexible Gas Line to Burner
D) Male Union ¾" NPT
E) Pipe Cap
F) 1" X 1" X ¾" TEE
Note: Height of valve above ground level to
conform to local codes, if any.
Massachusetts state code requires
gas shut off to be a tee handled gas
cock.
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