Desa Unvented (Vent-Free) Gas Compact Classic Hearth Fireplace VMH26NRB Owner's Operation And Installation Manual page 17

CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 45° male flare fitting
5/8"-18 UNF (Unified National
Fine Thread) inlet connection and
the flexible gas line provided.
WARNING: A qualified
service person must connect
fireplace to gas supply. Follow
all local codes.
WARNING: Never connect
natural gas fireplace to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
IMPORTANT: For natural gas, check gas line
pressure before connecting fireplace to gas
line. Gas line pressure must be no greater
than 14" of water. If gas line pressure is higher,
heater regulator damage could occur.
CAUTION: Never connect
propane/LP fireplace directly
to the propane/LP supply. This
fireplace requires an external
regulator (not supplied). Install
the external regulator between
the fireplace and propane/LP
supply.
For propane/LP units, the installer must supply
an external regulator. The external regulator
will reduce incoming gas pressure. You must
reduce incoming gas pressure to between
11" and 14" of water. If you do not reduce
incoming gas pressure, fireplace regulator
damage could occur. Install external regula-
tor with the vent pointing down as shown in
Figure 21. Pointing the vent down protects it
from freezing rain or sleet.
113110-01H
INSTALLATION
Continued
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" or greater diameter to allow
proper gas volume to fireplace.
If pipe is too small, undue loss
of volume will occur.
Installation must include an equipment shutoff
valve, union, and plugged 1/8" NPT tap. Lo-
cate NPT tap within reach for test gauge hook
up. NPT tap must be upstream from heater
(see Figure 22, page 18).
IMPORTANT: Install equipment shutoff valve
in an accessible location. The equipment
shutoff valve is for turning on or shutting off
the gas to the appliance.
Check your building codes for any special
requirements for locating equipment shutoff
valve to fireplaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could
result in clogged fireplace valves.
sealant that is resistant to liquid
petroleum (LP) gas.
Propane/LP
Supply Tank
External
Regulator
with Vent
Pointing
Down
Figure 21 - External Regulator With Vent
www.desatech.com
CAUTION: Use only new,
WARNING: Use pipe joint
Pointing Down
17