Enerco MHBF20/NGT, TSIR20NGT, TSBF10NG, MHIR20NGT, MHBF10NG Test pressure in Excess of ½ psig 3.5kPa

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 to private (non-utility) gas well. This gas is commonly known as well-head gas.

IMPORTANT: Check your gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water. If gas line pressure is higher, heater regulator damage could occur.

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 larger 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).

cleaning. A sediment trap traps moisture and contami- nants. 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.

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

Test pressure in Excess of ½ psig (3.5kPa)

1.	Disconnect appliance with its appliance main
	gas valve (control valve) and equipment shutoff
	valve from gas supply piping system. Pres-
	sures in excess of ½ psig will damage heater
	regulator.
2.	Cap off open end of gas pipe where equipment

3/8” NPT Pipe Nipple

Ground Joint Union

Equipment

Shutoff Valve

From Gas Meter (4” W.C. to 10.5” W.C. Pressure)

3” Minimum

Pressure

Regulator

Heater

Cabinet

Test Gauge

Connection

Tee Joint

Reducer Bushing to 1/8” NPT

1/8” NPT Plug Tap

Tee Joint

Pipe Nipple Sediment

Trap

Cap

	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.

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 equip- ment shutoff valve from your dealer. See Accessories, page 17.

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

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 equip- ment 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.

8 Installation instructions and Owner’s Manual 70574 REV. C 8/05