Mr. Heater MHVFRD10LP Operating Instructions And Owner's Manual page 9

Pressure
Regulator
Nipple
Tee Joint
Nipple
Fuel line from
Regulated LP Tank
(11"W.C to 14" WC Pressure)
3" minimum
Figure 12
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
piping system by closing its equipment shutoff valve
Unvented Liquid Propane Fired Room Heater
HEATER CABINET
3/8" NPT Pipe Nipple
Ground Joint Union
Nipple
Shutoff Valve
1/8" NPT Plug Tap
Test Gauge
Connection
Reducer Bushing
to 1/8" NPT
Tee Joint
Sediment
Nipple
Trap
Cap
9
during any pressure testing of the gas supply piping
system at test pressures equal to or less than ½ psi (3.5
kPa). (see figure 13).
2. Pressurize supply piping system by either using
compressed air or opening propane/LP supply valve.
3. Check all joints from the propane/LP supply valve to
equipment shutoff valve (see figure 14. Apply mixture
of liquid soap and water to gas joints. Bubbles forming
show a leak.
4. Correct all leaks at once.
5. Depressurize and relieve pressure from supply piping
system.
Pressure Testing Heater Gas Connections:
1. Make sure that the heater supply piping system is
connected and has been leak tested as described above.
2. Make sure control knob of heater is in OFF position.
3. Open equipment shutoff valve (see figure 13).
Equipment
Shutoff Valve
Figure 13
4. Open propane/LP supply valve.
5. Check all joints from equipment shutoff valve to control
valve (see figure 14). Apply mixture of liquid soap and
water to gas joints. Bubbles forming show a leak.
6. Correct all leaks at once.
7. Light heater (see Operating Your Heater, page 10).
To regulated propane
source
Figure 14
8. Turn off heater (see To Turn OFF Gas to Appliance, page
10.)
9. Replace lower front panel.
Installation Instructions and Owner's Manual
Open
Closed
Control Valve
Equipment
Shutoff Valve