INSTALLATION

Continued

Installing Bottom Mounting Screws

1.Locate two bottom mounting holes. These holes are near bottom on back panel of heater (see Figure 12).

2.Mark screw locations on wall.

3.Remove heater from mounting bracket.

4.If installing bottom mounting screws into hollow or solid wall, install wall anchors. Follow steps 1 through 4 under Attaching To Wall Anchor Method, page 10.

If installing bottom mounting screw into wall stud, drill holes at marked locations using 9/64" drill bit.

5.Replace heater onto mounting bracket.

6.Place spacers between bottom mounting holes and wall anchor or drilled hole.

7.Hold spacer in place with one hand. With other hand, insert mounting screw through bottom mounting hole and spacer. Place tip of screw in opening of wall anchor or drilled hole.

8.Tighten both screws until heater is firmly secured to wall. Do not over tighten.

Note: Do not replace front panel at this time. Replace front panel after making gas connec- tions and checking for leaks.

Front View

Heater

Wall

Spacer

Side View

Figure 12 - Installing Bottom Mounting

Screws

CONNECTING TO GAS SUPPLY

WARNING: This appliance

requires a 3/8" NPT (National

Pipe Thread) inlet connection to

the pressure regulator.

 

WARNING:Aqualified service

personmustconnectheatertogas

supply. Follow all local codes.

WARNING: For natural

gas, never connect heater to

private (non-utility) gas wells.

This gas is commonly known

as wellhead gas.

 

IMPORTANT: For natural gas, check gas line

pressure before connecting heater to gas line. Gas

line pressure must be no greater than 10.5 inches of

water. If gas line pressure is higher, heater regula-

tor damage could occur.

 

CAUTION: For propane/LP

gas, never connect heater di-

rectly to the propane/LP supply.

This heater requires an external

regulator (not supplied). Install

theexternalregulatorbetweenthe

heater and propane/LP supply.

For propane/LP gas, the installer must supply an

external regulator. The external regulator will

reduce incoming gas pressure. You must reduce

incoming gas pressure to between 11 and 14 inches

of water. If you do not reduce incoming gas pres-

sure, heater regulator damage could occur. Install

the external regulator with the vent pointing down

as shown in Figure 13. Pointing the vent down

protects it from freezing rain or sleet.

Propane/LP

External

Supply Tank

 

Regulator

 

Vent

 

Pointing

 

Down

Figure 13 - External Regulator With Vent

Pointing Down

 

116292-01A

www.desatech.com

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Desa VSL18NT Connecting to GAS Supply, Installing Bottom Mounting Screws, Important For natural gas, check gas line