Installing A Condensate Drain - Navien NPE-180A2 Installation Manual

5.5 Installing a Condensate Drain

Refer to the following examples to install a
condensate drain hose (field supplied) to the
common vent system. The condensate drain hose
prevents condensate or rain from entering the
exhaust system and gathering above the Common
Vent Collar Kit. The exhaust vent must be sloped
down towards the drain to prevent water from
collecting within the pipe.
Intake
End Cap
Unit Unit
1 2
Siphon loop
Drain hose
End
Cap
Unit Unit
1 2
Siphon loop
Drain hose
76 Installing a Common Vent System
Exhaust
Unit
12
Drain
Exhaust
Unit
Intake
12
Drain
To install a condensate drain to the Common Vent
system:
1. Form a loop with a drain hose and fix it with a
tie.
While shaping the hose, do not
Note
●
bend the hose excessively. The hose
will be deformed and the flow will
be restricted if the hose is bent in
sharp angles.
Do not fix the hose too tight when
●
tying the hose to form the loop.
The hose will be deformed and the
flow will be restricted if the tie is
too tight.
2. Prime the loop using tap water. The water inside
the hose should be higher than 7.1 in (180 mm),
and water should be inside the hose before
operating the water heater.
3. Install the hose to the Common Vent system and
direct the end of the hose to a drain.
7.1 in
(180 mm)
WARNING
After installing the condensate drain hose,
check the loop again to ensure that the prime
water is not spilled. The loop (siphon) must be
primed with water before running the system
to prevent toxic exhaust gas from leaking into
the installation site.