Rinnai Demand Duo R-Series Installation And Operation Manual page 26

1. Apply a pipe sealant approved for gas to
the field-supplied 3/4 MNPT gas line
(Figure 18).
NOTE
DO NOT apply sealant to the parallel
threads on the flare side of the Gas Flare
Adapter.
Figure 18
Flare Side
2. Thread the 3/4 NPT side of the flare
nut onto the field-supplied 3/4 MNPT
gas line (Figure 19).
Figure 19
Flare Side
36 in. Gas Flex
26
Apply sealant
to connection
3/4 MNPT
3/4 NPT side
Demand Duo™ R-Series (REC) Installation and Operation Manual
3. Thread the flare side of the 36 in. Gas Flex
into the flare side of the Gas Flare
Adapter (Figure 20).
Figure 20
36 in. Gas Flex
4. Use a backer wrench to tighten all
connections to the recommended torque
value of 62 lbs-ft (Figure 21).
Figure 21
5. Leak test ALL gas fittings and assembly
using a leak test solution, soap and water,
or an equivalent nonflammable solution.
6. If leak is identified at the flex connection,
gradually tighten fitting until leak stops.
DO NOT connect gas flex directly to pipe
threads of gas supply pipe or appliance. Install
Gas Flex using only the Gas Flare Adapter
provided.
Flare Side