INSTALLATION

Continued

CAUTION: Use only new, black iron or steel pipe. Inter- nally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of large enough diameter to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.

Typical Inlet Pipe Diameters

CRN18(T) and CRP16(T) - 3/8" or greater CRN30(T) and CRP26(T) - 1/2" or greater CRT30NT and CRT26PT - 1/2" or greater

Installation must include 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 heater (see Figure 15).

IMPORTANT: Install an 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.

Install sediment trap in supply line as shown in Figure 15. 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

Bracket

 

 

Nipple

Heater

 

 

Ground

Cabinet

 

 

Joint

Connection*

Bushing to

 

Union

 

Valve *

 

Tee Joint

 

Equipment

 

Reducer

 

Shutoff

Gauge

1/8" NPT

 

Natural Gas

1/8" NPT

 

 

 

 

3"

From Gas

 

Plug Tap

Meter (7" W.C.

Test

Min.

 

 

 

 

 

to 10.5" W.C.

 

 

 

 

 

Tee

Pipe Cap

 

Pressure)

 

 

Propane/LP

 

Joint

Nipple

 

 

Sediment Trap

 

From External

 

 

Regulator

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

*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.

Figure 15 - Gas Connection

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.

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.

12

www.desatech.com

107883-01H

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Image 12
Desa CRN30 installation manual Checking GAS Connections, Joint Nipple Sediment Trap From External Regulator
Page 11 Page 13

CRN30 specifications

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