Vermont Casting 36LDVT 39LDVT, 3LDVT High Elevations, Gas Line Installation, Remote ON/OFF Switch

Models: 3LDVT 36LDVT 39LDVT 43LDVT

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High Elevations

High Elevations

Input ratings are shown in BTU per hour and are certified without deration for elevations up to 4,500 feet (1,370m) above sea level.

For elevations above 4,500 feet (1,370m) in USA, installations must be in accordance with the cur- rent ANSI Z223.1/NFPA 54 and/or local codes hav- ing jurisdiction.

In Canada, please consult provincial and/or local authorities having jurisdiction for installations at elevations above 4,500 feet (1,370m).

Gas Line Installation

When purging gas line, the front window frame removed.

The gas pipeline can be brought in through the rear of the fireplace as well as the bottom. Knockouts are provided on the bottom behind the valve to allow for the gas pipe installation and testing of any gas connection. It is most convenient to bring the gas line in from the rear right side of the valve as this allows fan installation or removal without disconnecting the gas line.

The gas line connection can be made with properly tinned 3/8” copper tubing, 3/8” rigid pipe or an approved flex connector. Since some municipalities have ad- ditional local codes, it is always best to con- sult your local authority and the National Fuel Gas Code, ANSI Z223.1/NFPA 54 in the USA or the CSA-B149.1 installa- tion codes.

1/2” Gas Supply

1/2” NPT X 1/2” Flare Shut-off Valve

3/8” Flex line (from valve)


Fig. 5 Typical gas supply installation.

Always check for gas leaks with a mild soap and water solution. Do not use an open flame for leak testing.

The gas control is equipped with a captured screw type pressure test point, therefore it is not necessary to pro- vide a 1/8” test point up stream of the control.

When using copper or flex connector use only approved fittings. Always provide a union when using black iron pipe so that the gas line can be easily disconnected for burner or fan servicing . See gas specifications for pres- sure details and ratings.

LDVT Series Direct Vent GaS Fireplace

The fireplace valve must not be subjected to any test pressures exceeding 1/2 psi. Isolate or disconnect this or any other gas appliance control from the gas line when pressure testing.

Remote ON/OFF Switch


1.Thread the wiring through holes on the end panels of appliance. Take care not to cut wire or insulation on metal edges. Route the wire to a conveniently located receptacle box.

2.Attach the wire to the ON/OFF switch and install the switch into the receptacle box.

3.Connect the other ends of the wire to the gas control valve. (Fig. 6)

Remote ON/OFF

Switch or Thermostat or

Remote Control


TH Gas


TP Valve

Gas Line Installation TH


Fig. 6 Remote switch wiring diagram.

Alternate Switch Location

The remote switch can be installed on the front/side of the access door. Simply mount the switch to the bracket provided and screw the bracket to either side of the frame, lining up the screws with the pre-punched holes. (Fig. 7)


Fig. 7 Alternate switch location.

Do not wire the remote ON/OFF wall switch for the gas fireplace to the 120 volt power supply.



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Vermont Casting 36LDVT 39LDVT High Elevations, Gas Line Installation, Remote ON/OFF Switch, Alternate Switch Location