Navien NCB-150E Installation & Operation Manual page 15

Adequate installation clearances
CAUTION
Do not install the boiler on carpeting.
Install the boiler in an area that allows for service and maintenance
access to utility connections, piping, filters, and traps. Based on
the installation location, ensure that the following clearances are
maintained:
Top
Back
Side
Side
Front
Bottom
Clearance from: Indoor Installation
Top 9 in (229 mm) minimum
Back 0.5 in (13 mm) minimum
Front 4 in (100 mm) minimum
Sides 3 in (76 mm) minimum
Bottom 12 in (300 mm) minimum
Clean, debris and chemical-free combustion air
Do not install the boiler in areas where dust and debris may
accumulate or where hair sprays, spray detergents, chlorine, or
similar chemicals are used.
Do not install the boiler in areas where gasoline or other
flammables are used or stored.
Ensure that combustible materials are stored away from the
boiler and that hanging laundry or similar items do not obstruct
access to the boiler or its venting.
High Elevation Installations
This boiler may be installed at elevations up to 10,100 ft (3,078 m)
for use with natural gas (NG), and up to 4,500 ft (1,370 m) for
use with liquefied petroleum (LP). Refer to "7. Setting the DIP
Switches" on page 48 for the appropriate altitude setting.
Above 2,000 ft (610m), the boiler will derate by 4% for
Note
each 1,000 ft (300 m) of altitude gain.
Installing the Boiler 15