Fireplace Preparation; Installing Vented Applications - Vermont Castings NBST27 Installation Instructions Manual

NBST27 Unvented Gas Log Set
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.
This appliance is for installation only in a solid fuel burning fireplace
(masonry fireplace or manufactured fireplace) with a working flue and
constructed of noncombustible material.
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.
This log set may be installed as a vented log set.
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 sooting.
Use a heat resistant sealant. Do not seal the chimney
flue damper.

INSTALLING VENTED APPLICATIONS

Milli-volt 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, noncombustible
material and minimum mantel requirements do not
apply.
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.
Do not seal chimney flue damper.
Install and operate the appliance as directed in this
manual.
10

FIREPLACE PREPARATION

DAMPER STOP INSTALLATION:
A damper stop must be provided with the unit when used
for vented applications. Contact your dealer to obtain one.
The damper stop must be installed as shown in Figure 10
to prevent full closure of the fireplace damper blade and
provide a minimum 29 square inch flue opening.
refer to Page 27 for installations in the Commonwealth
of Massachusetts.
FP2370
Figure 10 -
Damper Stop Installation
(Refer to WARNING at top of page)
FP2370
damper
Damper Stop
Damper
81D3032