Monessen Hearth BTU/Hr - Manual (Page 17)

16 49D0090 49D0090 17
INSTALLATION
Use only new, black iron or steel pipe. Internally- 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 heater. If pipe is too small, undue loss of pressure will occur.
CAUTION
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe
could result in clogged heater valves.
IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/or fittings.
Use pipe joint sealant that is resistant
to liquid petroleum (LP) gas.
CAUTION
Installation must include an equipment shutoff valve, union,
and plugged 1/8” NPT tap. Locate NPT tap within reach for
test gauge hook up. NPT tap must be upstream from heater
(see Figure 14).
IMPORTANT: Install an equipment shutoff valve in an
accessible location. The equipment shutoff valve is for
turning on or shutting off the gas to the appliance.
Figure 14 - Gas Connection
Pipe Coupling
To Gas Log
Set or to Gas
Valve Shutoff
Valve
Gas Supply Inlet
Pipe
Locations that the Pressure Tapping
Point May be Installed
CONNECTING TO GAS SUPPLY
This appliance requires a 3/8” NPT
(National Pipe Thread) inlet connection
to the pressure regulator.
W
ARNING
A qualified service person must
connect heater to gas supply. Follow
all local codes.
W
ARNING
Never connect heater to private (non-
utility) gas wells. This gas is commonly
known as wellhead gas.
W
ARNING
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 inches of water
column. If you do not reduce incoming gas pressure, heater
regulator damage could occur. Install external regulator with
the vent pointing down as shown in Figure 13. Pointing the
vent down protects it from freezing rain or sleet.
Figure 13 - External Regulator with Vent
Pointing Down
Propane/LP
Supply Tank
External
Regulator
Vent
Pointing
Down