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WARNING: If you do not follow these instructions exactly, a fire or explosion

may result causing property damage, personal injury or loss of life.

This appliance has a pilot which can  be lit with the equipped piezo ignitor.  When lighting the pilot, follow these

instructions exactly.
BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because propane

gas is heavier than air and will settle at the lowest level.
WHAT TO DO IF YOU SMELL GAS

 Do not attempt to light any appliance.

 Do not touch any electric 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.

Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand,

don't try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.

Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the

appliance and to replace any part of the control system and any gas control which has been under water.

STOP !

  Read the safety information above on this page.

Press the knob lightly and turn clockwise                to the “OFF” position.
Wait five (5) minutes to clear out any gas.  If you smell gas, STOP!  Follow

the safety information above on this page.  If you 

donʼt

 smell gas, go to 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

li

P

t

o

li

P

Position. Press down and hold.
Press the Piezo Ignition button to light the pilot.  Repeat this operation with the

knob pressed down until the pilot is lit.  When the pilot lights, continue pressing

for another 10 seconds.  Release the knob.  If the pilot goes out, repeat steps

1 through 6.
If the knob does not pop up when released, stop and immediately call your 

service technician or gas supplier.
If the pilot will not stay lit after several tries, turn the gas control knob to  F

F

O F

F

O F

F

O F

F

O

OFF and

call your service technician or gas supplier.

Press down and turning the control knob counterclockwise              to the

desired temperature.  The temperature can be regulated between HI and LO

capacity, according to the indicated scale marked on the knob.

1.
2.
3.

4.
5.

6.

7.

LIGHTING INSTRUCTIONS

When the heater is first started after installation or if the heater has not been used for a long period of time, there is a

normal delay while air is being purged from the gas line until gas arrives to heater. In this case, maintain pressure on the

knob at the “Pilot” position for 30-40 seconds while pressing the piezo button every 4-5 seconds to avoid accumulation of 

gas, or until the pilot lights.

When the heater is not to be in use for a long period of time or for servicing, turn the control knob clockwise                 to

the

F

F

O F

O  position and close the main gas supply valve.

TURNING OFF GAS TO APPLIANCE

13

OPERATING INSTRUCTIONS

FOR YOUR SAFETY READ BEFORE LIGHTING

Ignition button

OFF

HI

Pilot

LO

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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