Desa VYM27NR - Manual (Page 11)

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Hearth
5"
Min.
Combustible
Material
INSTALLATION
Continued
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
B. If combustible materials are less than 14" to the
fireplace, you must install appliance at least 5"
above the combustible flooring (see Figure 9).
INSTALLING DAMpER CLAMp
ACCESSORY FOR VENTED
OpERATION
Note: When used as a vented heater, appliance
must be installed only in a solid-fuel burning
fireplace with a working flue and constructed of
noncombustible material.
If your heater is a manually controlled model, you may
use this heater as a vented product. There are three rea-
sons for operating your heater in the vented mode:
1. The fireplace does not meet the clearance to com-
bustibles requirements for vent-free operation
2. State or local codes do not permit vent-free
operation
3. You prefer vented operation
If reasons number 1 or 2 above apply to you, you
must permanently open chimney flue damper. You
must install the damper clamp accessory (to order,
see Accessories, page 25). This will insure vented
operation (see Figure 10). The damper clamp will
keep damper open. Installation instructions are
included with clamp accessory.
See chart below for minimum permanent flue
opening you must provide. Attach damper clamp
so the minimum permanent flue opening will be
maintained at all times.
Area of Various Standard Round Flues
Diameter Area
5" 20 sq. inches
6" 29 sq. inches
" 39 sq. inches
8" 51 sq. inches
Chimney Height Minimum permanent
Flue Opening
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
Damper Clamp
Damper
Clamp
Damper
Damper
Masonry Fireplace Manufactured
Fireplace
Figure 10 - Attaching Damper Clamp
INSTALLING HEATER BASE
ASSEMBLY
CAUTION: Do not remove the
data plates attached to the heater
base assembly. The data plates
contain important warranty and
safety information.
WARNING: You must secure
this heater to fireplace floor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
WARNING: If installing in a
sunken fireplace, special care
is needed. You must raise the
fireplace floor to allow access
to heater control panel. This
will insure adequate air flow
and guard against sooting and
controls being damaged. Raise
fireplace floor with noncombus-
tible material. Make sure material
is secure.
CAUTION: Do not pick up
heater base assembly by the
burner. This could damage
heater. Only handle base as-
sembly by grates.