Navien NFC-175 Installation & Operation Manual page 84

Connecting the Space Heating Piping
Has the system been filled (less than 80 psi) and purged of air?
Does the piping incorporate means for air removal (scoop, separator, etc.)?
Is there an expansion tank installed and set to the proper system pressure?
If antifreeze has been used, is it the proper type and is the concentration appropriate?
If an external low water cut off (LWCO) is installed, is it wired to the boiler?
Connecting a Pressure Relief Valve
Have you installed an approved pressure relief valve on the boiler?
Does the rating of the pressure relief valve match or exceed the maximum BTU rating of the boiler?
Is the pressure relief valve
Have you installed the pressure relief valve on the space heating supply pipe near the boiler?
Have you installed a discharge drain tube from the pressure relief valve to within 6-12 in (150-300 mm) of the floor?
Connecting the Condensate Drain
Have you installed a condensate drain line from the boiler to a drain or laundry tub?
Venting the boiler
Have you vented the boiler with 2 in or 3 in PVC, CPVC, polypropylene, stainless steel, Type BH Special Gas Vent
(ULC-S636) for Category IV boilers (Canada), or in accordance with all local codes and the guidelines in this manual?
Have you ensured that ABS or PVC cellular core pipe has not been used as venting for the boiler?
Is the vent sloped upward toward the vent termination at a rate of
Are all vent runs properly supported?
Is the vent termination properly supported?
Are the air intake and exhaust connections on the flue and vent lines correctly sealed?
Have you installed end caps on the exhaust and intake pipes?
Have you checked the venting for leaks?
Is the vent termination at least 12 in (300 mm) above the exterior grade?
Have you ensured that sufficient make-up air is available?
Is the total vent length within the maximum vent length restriction?
84 Installation Checklist
/ in on the space heating outlet?
3
4
/ in per foot (2% grade)?
1
4
Yes No
Yes No
Yes No
Yes No