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GAS RATING - NATURAL

M36(B,H)/VM36(B,H) M42(B,H)/VM42(B,H)

Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr

Manifold Pressure: 3.5 in. WC (.87 kPa) 3.5 in. WC (.87 kPa)

Minimum Supply Pressure: 4.5 in. WC (1.12 kPa) 4.5 in. WC (1.12 kPa)

Maximum Supply Pressure: 10.5 in. WC (2.66 kPa) 10.5 in. WC (2.66 kPa)

Orifice Size: # 30 # 29

GAS RATING - PROPANE/LP

Max. Input Rating: 40,000 Btu/Hr 45,000 Btu/Hr

Manifold Pressure: 10.0 in. WC (2.49 kPa) 10.0 in. WC (2.49 kPa)

Minimum Supply Pressure: 11.0 in. WC (2.74 kPa) 11.0 in. WC (2.74 kPa)

Maximum Supply Pressure: 13.0 in. WC (3.23 kPa) 13.0 in. WC (3.23 kPa)

Orifice Size: # 50 # 47

Models M36(B,H), VM36(B,H), M42(B,H) and VM42(B,H) are

vented gas fireplaces that use a millivolt gas control valve with a

millivolt ignition system. A 6" B-Type venting system and a listed

type vent cap are not supplied but are required for proper operation.

See venting instructions on pages 9 and 10.

INTRODUCTION

Models M36(B,H), VM36(B,H), M42(B,H) and VM42(B,H) are

factory equipped for use with natural gas and must be converted when

intended for use with propane/LP gas. A respective model PCBM-36

or PCBM-42 conversion kit may be purchased for simple conversion

to propane/LP gas. See Accessories, page 27.

BEFORE YOU BEGIN

Before beginning the installation of your appliance, read these

instructions through completely.

This DESA appliance and its approved components are safe when

installed according to this installation manual and are operated as

recommended by DESA. Unless you use DESA approved components

tested for this appliance, YOU MAY CAUSE A FIRE HAZARD!

The DESA warranty will be voided by, and DESA disclaims any

responsibility for the following actions :

A) Modification of the appliance or any of the components.

B) Use of any component part not approved by DESA in combi-

nation with this appliance.

C) Installation and/or operation in a manner other than instructed

in this manual.

D) The burning of anything other than the type of gas approved

for use in this gas appliance.

WARNING: This gas appliance must not be con-

nected to a chimney flue servicing a solid fuel burn-

ing appliance.

WARNING: Installation of this appliance should be

done by a qualified service person well trained in the

installation of such appliances. You will also need a

building permit from your local Building and Safety

Commissioner before installing this appliance; other-

wise your insurance co. may not cover this appliance.

NOTICE: This appliance is not intended to be used as

a primary source of heat.

CAUTION: Do not connect appliance before pres-

sure testing gas piping. Damage to gas valve may

result and an unsafe condition may be caused.

The appliance and it’s individual shutoff valve must be discon-

nected from the gas supply piping system during any pressure

testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).

The appliance must be isolated from the gas supply piping system

by closing its individual manual shutoff valve during any pressure

testing of the gas supply piping system at test pressures equal to or

less than 1/2 psig (3.5 kPa).

For the purpose of input adjustment two pressure taps (for IN and

OUT pressures) are provided on the gas control valve for test gauge

connections to the appliance.

The installation must conform with local codes or, in the absence of

local codes, with the current National Fuel Gas Code, ANSI Z223.1/

NFPA 54 or with the current CAN/CGA B149 Installation Codes.

This appliance complies with ANSI Z21.50-2000 and CSA 2.22-

2000 as Vented Gas Fireplaces and is listed and tested by the

Canadian Standards Association to the above test standards.

INTRODUCTION

Before You Begin

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