Navien NP-180, Service Manual

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Hot Outlet Drain
(Only “A” Model)
Bottom of Water Heater
Bottom of Water
Heater Bottom of Water Heater
(Only “A” Model) Inlet Water Filter
1. Remove the retaining clip.
2. prepare the bucket.
3. Twist and remove the cap.
4. clean out the siphon.
5. Replace the cap and the retaining clip.
6. pour the water into the exhaust
connection to fill the siphon.
Internal Drain (#1)
(Only “A” Model)
Internal Drain (#2)
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7. Maintenance
7.1. Draining the Water heater
Describe precautions before maintenance, and show tools required when maintenance.
Draining the water in the waterway
Drain the water in the waterway according to the following figure. Also, clean the inlet
water filter.
Before removing the inlet filter, ensure that the water supply has been turned off, and all
pressure in the hot water system has been drained off by opening a hot water tap to ensure
on water is flowing.
The filter assembly should hand tightened only.
Draining the condensate water in the siphon
According to the following figure, prepare the bucket to put the condensate water and remove
the cap bottom of the siphon, and then drain the condensate water in the siphon.