Desa FVFM27NR/PR, VYM27NR/PR Checking GAS, Connections, Pressure Testing Gas Supply Piping System

FLAME-MAX®

UNVENTED GAS LOG HEATER

INSTALLATION	CHECKING GAS
Continued	CONNECTIONS

Pressure Testing Gas Supply Piping System

We recommend that you install sediment trap in supply line as shown in Figure 14. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. Locate sedi- ment trap where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them from going into heater controls. If sediment trap is not installed or is installed wrong, heater may not run properly.

CAUTION: Avoid damage to control. Hold fitting with wrench when connecting it to gas piping and/or fittings.

WARNING: Test all gas pip- ing and connections for leaks after installing or servicing. Cor- rect all leaks at once.

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

CAUTION: For propane/LP gas, make sure external regula- tor has been installed between propane/LP supply and heater. See guidelines under Connect- ing to Gas Supply, page 11.

Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)

1.	Disconnect appliance with its appliance
	main gas valve (control valve) and equip-
	ment shutoff valve from gas supply pip-
	ing system. Pressures in excess of 1/2 psig
	will damage heater regulator.
2.	Cap off open end of gas pipe where
	equipment shutoff valve was con-
	nected.
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 de-
	tection fluid to gas joints. Bubbles
	forming show a leak.

Approved Flexible Gas Hose (if allowed by local codes)

Gas Control

CSA Design-Certified	From Gas Meter for
Equipment Shutoff Valve	natural gas (5" W.C.** to
With 1/8" NPT Tap*	10.5" W.C. Pressure)
	From External Regulator
	for propane/LP gas (11"
	W.C.** to 14" W.C.
	Pressure)

	Tee
	Joint	Sediment
3" Minimum	Pipe
		Trap
	Nipple
	Cap

5.	Correct all leaks at once.
6.	Reconnect heater and equipment
	shutoff valve to gas supply. Check re-
	connected fittings for leaks.

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

1.	Close equipment shutoff valve (see Fig-
	ure 15).
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 propane/LP sup-
	ply tank to equipment shutoff valve (see
	Figure 15). Apply a noncorrosive leak
	detection fluid to gas joints. Bubbles

Figure 14 - Gas Connection

*Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Accessories, page 24.

**Minimum inlet pressure for purpose of input adjustment.

forming show a leak.

4. Correct all leaks at once.

Equipment

Shutoff Open

Valve

Closed

Figure 15 - Equipment Shutoff Valve

For more information, visit www.desatech.com 12 108382