Desa VYM27NRPR Checking GAS Connections, Pressure Testing Gas Supply Piping System

12	INSTALLATION
	Connecting To Gas Supply (Cont.)
	Checking Gas Connections

INSTALLATION

Continued

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 sediment 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.

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 (con-
	trol valve) and equipment 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 connected.
3.	Pressurize supply piping system by either opening propane/LP sup-
	ply tank valve for propane/LP gas, or opening main gas valve lo-
	cated on or near gas meter for natural gas, or using compressed air.

CSA Design-Certified

Equipment Shutoff Valve

With 1/8" NPT Tap*

Approved Flexible Gas Hose (if allowed by local codes)

Natural Gas

From Gas Meter (5" W.C.** to 10.5" W.C. Pressure)

Propane/LP Gas From External Regulator

(11" W.C.** to 14" W.C. Pressure)

4.	Check all joints of gas supply piping system. Apply a noncorrosive
	leak detection fluid to gas joints. Bubbles forming show a leak.
5.	Correct all leaks at once.
6.	Reconnect heater and equipment shutoff valve to gas supply.
	Check reconnected fittings for leaks.

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

1. Close equipment shutoff valve (see Figure 15).

2. Pressurize supply piping system by either opening propane/LP sup-

ply tank valve for propane/LP gas, or opening main gas valve lo-

cated on or near gas meter for natural gas, or using compressed air.

3" Minimum

Cap Pipe Tee

Nipple Joint

Gas Control Sediment Trap

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.

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 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 exter- nal regulator has been installed between propane/LP supply and heater. See guidelines under Connecting to Gas Supply, page 11.

3.	Check all joints from propane/LP supply tank to equipment
	shutoff valve (see Figure 15). Apply a noncorrosive leak de-
	tection fluid to gas joints. Bubbles forming show a leak.
4.	Correct all leaks at once.

Pressure Testing Heater Gas Connections

1.Open equipment shutoff valve (see Figure 15, page 12).

2.Open main gas valve located on or near gas meter for natural gas or open propane/LP supply tank valve.

3.Make sure control knob of heater is in the OFF position.

4.Check all joints from equipment shutoff valve to control valve (see Figure 16 or 17, page 13). Apply a noncorrosive leak de- tection fluid to gas joints. Bubbles forming show a leak.

5.Correct all leaks at once.

6.Light heater (see Operating Heater, pages 14 through 16). Check all other internal joints for leaks.

7.Turn off heater (see To Turn Off Gas to Appliance, page 15).

Open

Equipment

Shutoff

Valve

Closed

Figure 15 - Equipment Shutoff Valve

For..com

110398-01A