INSTALLATION

Continued

CAUTION:Useonlynew,black ironorsteelpipe.Internally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of 1/2" diameter or greater to allow proper gas vol- ume to heater. If pipe is too small, undue loss of volume will occur.

Installation must include an equipment shutoff valve, union and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from log set (see Figure 7).

IMPORTANT: Install 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 NPT threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.

WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

We recommend that you install a sediment trap in supply line as shown in Figure 7. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and appliance. 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 gas control. Hold gas control with wrench when connecting it to gas piping and/or fittings.

 

 

CSA Design-Certified

 

 

Equipment Shutoff

 

 

Valve with 1/8" NPT

 

 

Tap*

Natural

 

 

 

 

 

 

From Gas

Approved Flexible

 

Meter (5" W.C.**

Gas Hose (If

 

 

to 10.5" W.C.

allowed by local

 

Pressure)

codes)

3" Min.

 

 

 

 

Propane/LP

Pipe

Cap

Tee

From External

Regulator (11"

Nipple

Joint

W.C.** to 14"

Sedament Trap

W.C. Pressure)

 

 

 

Figure 7 - Gas Connection

*Purchase the optional CSAdesign-certified shutoff valve from your dealer. See Accessories, page 17.

** 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

toalljoints.Bubblesformingshow

a leak. Correct all leaks at once.

 

CAUTION: Make sure exter-

nal regulator has been installed

between propane/LP supply

and appliance. See guidelines

under Connecting to Gas Sup-

ply, page 7.

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 control valve.

2.

Cap off open end of gas pipe where equipment

 

shutoff valve was connected.

8

www.desatech.com

114924-01B

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Desa MVO18VPA, MVO24VNA, MVO24VPA Checking GAS Connections, Natural, Propane/LP, Test Pressures In Excess Of 1/2 Psig, KPa
Page 7 Page 9

MVO24VPA, MVO18VNA, MVO18VPA, MVO24VNA specifications

Desa MVO18VPA, MVO24VPA, MVO18VNA, and MVO24VNA represent a line of versatile and efficient heating solutions designed for various residential and commercial applications. These models are tailored to meet diverse user requirements while providing exceptional value through advanced technologies and features.

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