Monessen Hearth NBST27NV-B Installation & Owner's Manual page 12

WARNING
Before installing in a solid fuel burning fireplace,
The chimney flue and firebox must be cleaned of
soot, creosote, ashes and loose paint by a qualified
chimney cleaner.
WARNING
This log set can be installed in a solid fuel burning
fireplace (masonry fireplace or manufactured
fireplace) with a working flue and constructed of
non combustible material or in a vent-free firebox.
Exception: DO NOT install this appliance in a factory-
built fireplace that includes instructions stating that
it has not been tested or should not be used with
unvented gas logs. This log set may be installed as
a vented log set.
WARNING
The use of thermostat is not allowed on vented log
application. It is only allowed on unvented room
heater classification.
Before Fully Installing the Unit:
•
Turn OFF the gas supply to the fireplace or firebox.
•
Seal any fresh air vents and/or ash clean-out doors
located on the floor or wall of the fireplace. If left
unsealed, drafting may cause pilot outage or soot-
ing. Use a heat resistant sealant. Do not seal the
chimney flue damper.
Vented Application Installations
Millivolt controlled gas logs may be installed as a vented
decorative log set in compliance with ANSI Z21.60 and
National Fuel Gas Code, Section 6.6. (Since, the gas logs
are operated with the damper open, non-combustible
material and minimum mantel requirements do not
apply.)
12 Monessen • NBST27-B Gas Log Set Owner's /Installation Manual • 4615-900 Rev. D • 01/2020
Before installing the appliance:
•
Turn off gas supply to fireplace or firebox.
•
Have the fireplace floor and chimney professionally
cleaned to remove ashes, soot, creosote or other
obstructions. Have this cleaning performed annually
after installation.
•
Seal any fresh air vents or ash clean-out doors
located on floor or wall of fireplace. If not, drafting
may cause pilot outage or sooting. Use a heat-
resistant sealant.
Install and operate the appliance as directed in this
manual.
Damper stop installation:
A damper stop must be provided with the unit. Contact your
dealer to obtain one. The damper stop must be installed as
shown in Figure 3.9 to prevent full closure of the fireplace
damper blade and provide a minimum 29 square inch flue
opening.
Figure 3.8 - Damper Stop Installation
(Refer to WARNING at top of page)
FP2370
damper
WARNING
When this log set is installed in a vented application,
the damper must be clamped to be fully open.
Damper Stop
Damper