26 RIVA PLUS COMBI MANUAL
Gas Pipe Connections
11.
Gas supply piping is to be sized and installed properly in order to provide a supply of gas suffi -
cient 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.
Figure 11.1
Direction of flow
B
A
F
E
D
C
Manual T-handle Shutoff Valve
A)
Pressure Gauge Port
B)
Flexible Gas Line to Burner
C)
Male Union ¾” NPT
D)
Pipe Cap
E)
1” X 1” X ¾” TEE
F)
Note:
Height of valve above ground level to
conform to local codes, if any. Massa-
chusetts statecode requires gas shut
off to be a tee handled gas cock.
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 fl oor 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 liquefi ed pe-
troleum 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 shut-off valve must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressures in excess of ½ psi(3.5 kPa).
WARNINGS
DO NOT USE A FLAME FOR CHECKING GAS LEAKS.