Desa VTN25R, VTP22R installation manual Checking GAS Connections

Sediment Trap

Tee Pipe Cap Joint Nipple

INSTALLATION

Continued

Install sediment trap in supply line as shown in
Figure 13. Locate sediment trap where it is within
reach for cleaning. 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.
IMPORTANT: Hold the pressure regulator with
wrench when connecting it to gas piping and/or
fittings. Do not over tighten pipe connection to
regulator. The regulator body could be damaged.
Pressure
Regulator	3/8" NPT
Regulator
	Pipe

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:Neveruseanopen flame to check for a leak. Apply a noncorrosive leak detection fluid to all joints. Bubbles form- ing show a leak. Correct all leaks at once.

CAUTION: For propane/LP gas, make sure external regula-

Bracket Nipple

Heater Cabinet

Connection*	Tee Joint
	Reducer
	Bushing to
Gauge	1/8" NPT
	1/8" NPT
Test	Plug Tap

Ground

Joint

Union

Equipment

Shutoff

Valve *

3"

(76 mm)

Min.

Natural Gas

From Gas Meter

[7" (1.8 kPa) WC to

10.5" (2.6 kPa) WC

Pressure]

Propane/LP

From External Regulator

[11" (2.7 kPa) WC to 14"

(3.5 kPa) WC Pressure]

Figure 13 - 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 Accessory, page 22.

tor has been installed between propane/LP supply and heater. See guidelines under Connect- ing to Gas Supply, page 10.

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 (3.5 kPa) 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 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 fittings for leaks.

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