Mr. Heater MHVFRD10NG Operating Instructions And Owner's Manual page 9

Pressure
Regulator
Nipple
Tee Joint
Nipple
Fuel line from
Gas Meter
(7"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
½
in excess of psi (3.5 kPa). The appliance must be
isolated from the gas supply piping system by closing its
equipment shutoff valve during any pressure testing of
the gas supply piping system at test pressures equal to
½
or less than 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 main gas valve on or near
gas meter.
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.
Unvented Natural Gas 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
Low Pressure
Test Pressure Equal To or Less Than ½ psig (3.5 kPa)
1. Close equipment shutoff valve (see figure 13)
2. Pressurize supply piping system by either using
compressed air or opening main gas valve on or near gas
meter.
3. Check all joints from the gas meter 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 natural gas 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 page 10.
To gas meter
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