Vermont Casting UC181N - Manual (Page 6)

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ATTENTION: This heater is clean burning. It requires
no outside venting. There is no heat loss out a vent or
up a chimney. Heat is generated by realistic flames.
This heater is designed for vent-free operation with flue
damper closed. State and local codes in some areas
prohibit the use of vent-free heaters.
NOTE: Where listed vented decorative logs are re-
quired, thermostat operation is not permitted.
Minimum Fireplace Size
The minimum input for the unvented gas log heater,
both 18” and 24” sizes is 25,000 BTU/Hr. The maximum
input is 39,000 BTU/Hr. This rating is for both natural
gas and LP gas units. It is very important to follow the
listed guidelines.
Before installation the gas log heater, make sure the
fireplace dimensions conform to the minimum fireplace
sizes shown.
Gas Line Connection
A minimum 1/2” gas line is required for distances of 15-
20 feet. A 3/4” gas line is required for distances over 20
feet. A gas shut off valve should be installed near the
fireplace.
Manual Shut-off Valve
Prior to installing this gas log set, a manual gas supply
valve must be installed at your fireplace. If the fireplace
does not have a manual (On/Off) supply valve, a
licensed plumber, gas company technician or other
qualified installer must install one.
Prefabricated Fireplace
Refer to the prefabricated fireplace owner’s manual
for specific instructions. As a general guideline only,
any insulation removed from the fireplace should be
replaced and the gas supply line should not touch any
wood within a distance of 1” from the fireplace side
walls.
Natural Gas: The minimum inlet supply pressure for
the purpose of input adjustment shall be 4.5” of water
column (w.c.). The maximum inlet supply pressure shall
be 10.5” w.c. The regulator pressure should be 3.5” w.c.
LP Gas: You must use an external pressure regulator
for LP gas log sets to reduce the supply tank pressure
to 14” w.c. The minimum inlet supply pressure for the
purpose of input adjustment shall be 11” w.c. The
maximum inlet supply pressure shall be 14” w.c. The
regulator pressure should be 10” w.c.
Pressure Testing
The appliance and its individual shut off valve must be
disconnected from the gas supply piping system during
any testing of this system at test pressures in excess of
1/2 psig (3.5 kPa). The gas log set must be isolated
from the gas piping system at test pressures equal to or
less than 1/2 psig (3.5kPa). An 1/8” NPT fitting, located
on the bottom of the gas control valve, must be re-
moved to connect a test gauge to measure the manifold
pressure.
Tools Required
8” adjustable crescent wrench
Pipe thread compound or teflon tape
12” pipe wrench or channel lock pliers
For Hood Installation:
Power drill
3/32” drill bit
Phillips screwdriver
Unpacking
1. Remove logs and heater base assembly from
carton. NOTE: Do not pick up heater base assembly
by its U-shaped burner. This could damage the
heater. Always handle base assembly by grate.
2. Remove all protective packaging applied to logs and
for shipment.
3. Check all items for any shipping damage. If dam-
aged, promptly inform deter where your purchased
the heater.
Gas Plumbed on Left Side of Fireplace
NOTE: Your gas log set is assembled at the factory
to be installed in a fireplace plumbed with the gas
on the right side (facing). If your fireplace is
plumbed with the gas on the left side, you will need
to run black iron pipe along the back wall of the
fireplace (or as per local codes) to bring the gas
line to the right side. You can then place the log set
in front of the black pipe.
Hood Installation
NOTE: A hood assembly is not included with this
vent free gas set. Refer to Page 5 to see if a hood is
required.
The following instructions are specific to prefabri-
cated or masonry fireplaces. Refer to the instruc-
tions that match your fireplace, prefabricated or
masonry.
If glass doors are installed on your fireplace, they
must be removed to install the hood and may not
be usable with a vent free appliance.
Hood Installation for
Prefabricated Fireplace ONLY
1. Measure the fireplace opening and adjust the hood
to fit your opening. The right and left filler panels
should extend equally from the center piece connec-
tor.