Connecting To Gas Supply - Mr. Heater MHVFGH30LPT Operating Instructions And Owner's Manual

CONNECTING TO GAS SUPPLY

WARNING: A qualified service person must connect
heater to gas supply. Follow all local codes.
WARNING: This appliance requires a 3/8" NPT
(National Pipe Thread) inlet connection to the pressure
regulator. Use of floor mounting feet will require you
to use a 3/8 NPT street elbow to make gas connection.
CAUTION: Never connect heater directly to the Propane
supply. This heater requires an external regulator (not
included). Install the external regulator between the
heater and Propane/LP supply.
The external regulator will reduce the incoming gas
pressure to between 11 and 14 inches of water. If you
do not reduce incoming gas pressure heater regulator
damage could occur. Install external regulator with
the vent pointing down. Pointing the vent down
protects it from freezing rain or sleet.
CAUTION: 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 large enough diameter to
allow proper gas volume to heater. If pipe is too small,
undue loss of pressure will occur.
Installation must include an equipment shutoff valve, union
and plugged 1/8" NPT tap. Locate NPT tap within reach of
test gauge hookup. NPT tap must be upstream from heater
(see figure 12).
*A CSA/AGA certified equipment shutoff valve with
1/8" NPT tap is an acceptable alternative to test gauge
connection. Purchase the CSA/AGA certified equipment
shutoff valve from your dealer.
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.
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 fuel train.
CAUTION: Use pipe joint sealant that is resistant to
Natural Gas.
Install sediment trap in supply line as shown in figure 12.
Locate sediment trap where it is within reach for cleaning.
A sediment trap traps moisture and contaminants. This
keeps them from going into heater. If sediment trap is
not installed or is installed improperly, heater may not run
correctly.
IMPORTANT: Hold pressure regulator with wrench when
connecting it to gas piping and/or fittings.
Unvented Liquid Propane Fired Room Heater
Fuel line from
Regulated LP Tank
(11"W.C to 14" WC Pressure)
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections for
leaks after installing or servicing. Correct all leaks at
once.
WARNING: Never use an open flame to check for a
gas leak. Apply a mixture of liquid soap and water to
all joints. Bubbles forming show a leak. Correct all leaks
at once.
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM
High Pressure
Test pressure in Excess of ½ psig (3.5kPa)
1. The appliance and its appliance main gas valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of ½ psi (3.5 kPa).
2. Cap off open end of gas pipe where equipment shutoff
valve was connected.
3. Pressurize supply piping system by either using
compressed air or opening the propane/LP supply tank
valve.
4. Check all connections and joints in gas supply piping
system. Apply mixture of liquid soap and water to gas
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Depressurize and relieve pressure in supply piping
system.
7. Reconnect heater and equipment shutoff valve to gas
supply.
8. Reconnected fittings must be checked for leaks in next
section.
Low Pressure
Test Pressure Equal To or Less Than ½ psig (3.5 kPa)
1. The appliance must be isolated from the gas supply
9
Installation Instructions and Owner's Manual
HEATER CABINET
3/8" NPT Pipe Nipple
Pressure
Regulator
Ground Joint Union
Nipple
Shutoff Valve
Nipple
1/8" NPT Plug Tap
Test Gauge
Tee Joint
Connection
Reducer Bushing
Nipple
to 1/8" NPT
Tee Joint
3" minimum
Nipple
Cap
Figure 12
Sediment
Trap