Desa VS18NR - Manual (Page 10)

10 103449
UNVENTED NATURAL GAS LOG HEATER
DESA INTERNATIONAL
Installation Items Needed
• hardware package (provided with heater)
• approved flexible gas hose (not provided)
(if allowed by local codes)
• sealant (resistant to propane (LP) gas, not
provided)
• electric drill with 3/16" drill bit
Note: Install optional GHRCT Receiver
and Hand-Held Remote Control Kit (see
Accessories, page 23) before installing gas
log heater. See installation instructions in-
cluded with the kit.
1. Apply pipe joint sealant lightly to male
threads of gas fitting. Connect approved
flexible gas hose to inlet side of gas
control (see Figure 11, page 11).
IMPORTANT: Hold gas fitting with
wrench when connecting flexible gas hose.
2. Position heater base assembly in
fireplace.
INSTALLATION
Continued
INSTALLING HEATER BASE
ASSEMBLY
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 fire-
place floor to allow access to
heater control panel. This will in-
sure adequate air flow and guard
against sooting. Raise fireplace
floor with noncombustible mate-
rial. Make sure material is secure.
CAUTION: Do not pick up
heater base assembly by burners.
This could damage heater. Only
handle base assembly by grates.
IMPORTANT: Make sure the heater burn-
ers are level. If heater is not level, heater will
not work properly.
Area of Various Standard
Round Flues
Diameter (ins.) Area (sq. ins.)
5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches
INSTALLING DAMPER
CLAMP ACCESSORY FOR
VENTED OPERATION
Note: When used as a vented heater, appli-
ance 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 reasons for operating your
heater in the vented mode:
1. The fireplace does not meet the clear-
ance to combustibles 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
23). This will insure vented operation (see
Figure 10). The damper clamp will keep
damper open. Installation instructions are
included with clamp accessory.
Chimney Minimum Permanent
Height (ft.) Flue Opening (sq. ins.)
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
Figure 10 - Attaching Damper Clamp
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.
Damper
Damper
Clamp
Damper
Clamp
Damper
Damper
Masonry Fireplace Manufactured Fireplace
CAUTION: Do not remove the
metal Data Plates attached to the
heater base assembly. The Data
Plates contain important warranty
information.