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Do not store or use gasoline or other flammable 

vapors and liquids in the vicinity of this or any 

other appliance.

WHAT TO DO IF YOU SMELL GAS:

* Do not try to light any appliance.

* Do not touch any electrical switch; do not

   use any phone in your building.

* Immediately call your gas supplier from a

   neighbor's phone. Follow the gas supplier's

   instructions.

* If you cannot reach your gas supplier, call

   the fire department.

Installation and service must be performed by

a qualified installer, service agency or the gas

supplier.

This Appliance may be installed in an aftermarket, 

permanently  located,  manufactured  home  (USA 

only)  or  mobile  home,  where  not  prohibited  by 

local codes.

This appliance is  only  for use  with

the   type  of  gas  indicated   on  the

rating  plate.  This  appliance  is  not

convertible for use with other gases.

WARNING: If the information in these instructions 

are not followed exactly, a fire or explosion may 

result causing property damage, personal injury, 

loss of life.

INSTALLER: 

Leave this manual with 

the appliance.

CONSUMER: 

Retain this manual for

future reference.

OWNER’S INSTALLATION, SAFETY

AND OPERATIONS MANUAL

GRAVITY VENTED WALL FURNACE SERIES: MDV8P, MDV8N, MDV12P, MDV12VP, 

MDV12N, MDV12VN, MDV20P, MDV20VP, MDV20N, MDV20VN

Your heater may differ from models shown.

We thank you for purchasing our quality and reliable 

MARTIN    

heater. If you require assistance or have 

any questions about safety, installation, operation, require replacement parts, safety label or manual, please

contact our customer service:
Call us toll-free at  1-800-266-1414  Monday to Friday 8H AM to 17 H PM

Or email us at  [email protected]   www.bismar.com

Bismar Inc., 9, de Montgolfier st., Boucherville, Qc, J4B 8C4 

®

V1-6.2016

Conforms to ANSI STD Z21.86-2008

and certified to CSA STD 2.32-2008 (R2014), and CGA 2.17-M91 (R2009)

0544GH001S

Summary of Contents for MDV12N

Page 1: ...other gases WARNING If the information in these instructions are not followed exactly a fire or explosion may result causing property damage personal injury loss of life INSTALLER Leave this manual wi...

Page 2: ...ly durable products for your maximum comfort and satisfaction Install and use the heater with care The installation must conform with local codes or in the absence of local codes use the latest editio...

Page 3: ...t and hot air outlet 12 Do not spill water over the heater as it may cause corrosion 13 Allow heater to thoroughly cool before servicing 14 Input ratings are shown in BTU per hour and are rated for el...

Page 4: ...MDV8 2 cm 25 32 in MDV12 20 3 cm 1 3 16 in 61 cm 24 in 15 cm 6 in Clearances to combustible surfaces Rear MDV8 2 cm 25 32 in MDV12 20 3cm 1 3 16 in Sides 15 cm 6 in Above 61 cm 24 in From floor 18 cm...

Page 5: ...ible wall in both indoor and outdoor Floor level Fold here 5 The following diagrams serve as a reference for the installation of your heater with the ventilation provided with the unit The template th...

Page 6: ...s inlet 3 8 NPT 380 mm 15 230 mm 9 1 16 190mm 7 1 2 40mm 1 9 16 112mm 4 7 16 180mm 7 1 8 115m m 4 1 2 25mm 1 390mm 15 3 8 575mm 22 5 8 92mm 3 5 8 92mm 3 5 8 92mm 3 5 8 92mm 3 5 8 490mm 19 5 16 215mm 8...

Page 7: ...inlet 3 8 NPT 660 mm 26 270 mm 10 5 8 300mm 11 13 16 110mm 4 5 16 390mm 15 3 8 40mm 1 9 16 112mm 4 7 16 180mm 7 1 8 160m m 4 1 2 25mm 1 390mm 15 3 8 118mm 4 5 8 118mm 4 5 8 118mm 4 5 8 118mm 4 5 8 490...

Page 8: ...unting plates with screws provided MDV12 MDV20 heaters only Assemble the wall thimble 4 Prepare the rear spacers with mounting screws The wall s thickness cannot be less than 4 1 2 11 5 cm nor can it...

Page 9: ...g 4 IMPORTANT The appliance s vent cap should be at least 24 in 61 cm from any outside adjacent or intersecting wall IMPORTANT The appliance s venting system should be inspected at least once a year a...

Page 10: ...Gas connection Mounting Details Gas valve 18 cm 7 41 cm 16 1 8 MDV20 24 cm 9 7 16 MDV12 21 cm 8 1 4 MDV8 20 cm 7 7 8 See mounting details Putty 11 cm 4 5 16 Thimble only for models MDV12 MDV20 Drywall...

Page 11: ...appliance 10 000 BTU hr 3kW and 100 000 BTU hr 30 kW 36 inches 91 cm for appliance 100 000 BTU hr 30 kW 6 feet 1 83 m 7 feet 2 13 m 12 inches 30 cm 12 inches 30 cm 6 inches 15 cm for appliance 10 000...

Page 12: ...reater diameter to allow full gas volume to heater Excessive pressure loss will occur if the pipe is too small A manual shutoff valve union and plugged 1 8 NPT pressure tapping point must be installed...

Page 13: ...o the next step Find the pilot by looking through the viewing window on the front of the unit Press the knob down lightly and turn counterclockwise to the t o l i P t o l i P Position Press down and h...

Page 14: ...ve the two 2 M4 screws that hold the pilot in place Clean with a vacuum cleaner or use a can of compressed air To Remove Burner Loosen the gas line from the burner on the right side of the unit On the...

Page 15: ...15 Fig 5 Fig 7 Fig 6 Correct Flame Pattern Correct Flame Pattern Incorrect Flame Pattern...

Page 16: ...16 PARTS LIST MDV8 NATURAL 118 PROPANE 85 P ITEM DESCRIPTION QTY...

Page 17: ...17 PARTS LIST MDV12 MDV12V View NATURAL 137 PROPANE 104 P DESCRIPTION ITEM QTY...

Page 18: ...NATURAL 178 PROPANE 131 P ITEM DESCRIPTION QTY PARTS LIST MDV20 MDV20V View 18...

Page 19: ...rranties except as set forth herein and any implied warranties of merchantability and fitness in duration to the period of coverage of this expressed written Limited Warranty Bismar will not be liable...

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