Navien NHB Series, Installation & Operation Manual

Page: 75 / 135

75 Installing a Common Vent System
Vent Pipe Pitch and Supports
For horizontal runs, slope the horizontal section upward toward
the vent termination at a rate of
1 /
4
” per foot (2% slope).
Connecting Pipes with Cement
CAUTION
The vapors from primers and solvent cements can cause
nausea and can be dangerous to your health. Ensure that
the work area is well ventilated, or wear an approved organic
vapour respirator when working with primers and solvent
cements.
To connect the vent pipes using cement:
1. Spread an even layer of solvent cement on the inside of the
pipe fitting and the outside of the pipe.
2. Align the pipe with the pipe fitting and twist the pipe a quarter
turn as you insert it into the fitting. Twisting the pipe spreads
the solvent cement evenly to ensure a solid joint.
3. Hold the pipe and pipe fitting together for about 15 seconds
until the cement sets.
Note
Ɣ
Use approved solvent type cement for the proper
vent materials.
Ɣ
Use solvent type cement only.
Ɣ
Check the date of manufacture before using the
cement. Ensure that cement was not manufactured
more than 2 years prior to using it.
Ɣ
Ensure that the inside of the pipe fitting and the
outside of the pipe, where cement will be applied,
is clean.
Ɣ
Apply an even layer of cement over all mating
surfaces.
Ɣ
Use primer in temperatures lower than 32 ˭ (0 ˫ ).
Ɣ
Use solvent cement in room temperatures higher
than 32
˭
(0
˫
).
Ɣ
Installing vent pipe with cement in cold ambient
temperatures can result in longer cure times.
DANGER
Be careful not to apply force or impact to pipes after making
connections. An impact may break the bond and harmful gas
might leak inside the room.