Desa CBP30T, CBT20PT, CBN20TK, CBP20T, CBT30NT ing to Gas Supply, page, Checking Gas Connections

INSTALLATION

Continued

Note: Burner bracket not shown for clarity

Heater

Pressure Cabinet

Regulator

CAUTION: For propane/LP gas, make sure external regula- tor has been installed between propane/LP supply and heater. See guidelines under Connect-

Test Gauge Connection*

3/8" NPT Pipe Nipple

Tee Joint

Reducer Bushing to 1/8" NPT

1/8" NPT Plug Tap

Ground Joint

Union

Equipment

Shutoff

Valve *

ing to Gas Supply, page 12.

PRESSURE TESTING GAS SUPPLY PIPING SYSTEM Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)

1.	Disconnect appliance with its appliance main
	gas valve (control valve) and equipment
	shutoff valve from gas supply piping system.
	Pressures in excess of 1/2 psig will damage
	heater regulator.

Trap	Tee
	Joint
			3"
Sediment	Cap
	Pipe			Minimum
	Nipple	Natural Gas
		From Gas Meter
		(4" W.C. to 10.5"
		W.C. Pressure)
		Propane/LP
		From External
		Regulator
		(11" W.C. to 14"
		W.C. Pressure)

Figure 15 - Gas Connection

*A CSA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Accessories, page 23.

CHECKING GAS CONNECTIONS

WARNING: Test all gas piping and connections, internal and external to unit, for leaks after installing or servicing. Correct all leaks at once.

WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak detec- tion fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.

2.	Cap off open end of gas pipe where equipment
	shutoff valve was connected.
3.	Pressurize supply piping system by either
	opening propane/LP supply tank valve for
	propane/LP gas or opening main gas valve
	located on or near gas meter for natural gas,
	or using compressed air.
4.	Check all joints of gas supply piping system.
	Apply a noncorrosive leak detection fluid to
	all joints. Bubbles forming show a leak.
5.	Correct all leaks at once.
6.	Reconnect heater and equipment shutoff
	valve to gas supply. Check reconnected fit-
	tings for leaks.

Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)

1.Close equipment shutoff valve (see Figure 16).

2.Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve located on or near gas meter for natural gas, or using compressed air.

3.Check all joints from gas meter for natural gas (see Figure 17, page 14) or propane/LP supply tank for propane/LP gas, to equipment shutoff valve (see Figure 18, page 14). Apply a noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.

4.Correct all leaks at once.

Equipment	Open
Shutoff Valve
	Closed
Figure 16 - Equipment Shutoff Valve

107882-01K www.desatech.com 13