Martin MDV12N, Operation Manual, Page: 8 / 19

MDV8
- Total length of ventilation : wall thi 15.5 cm (6-3/32’’)
MDV12 & MDV20 - Total length of ventilation : wall thi 16.5 cm (6-1/2’’)
MDV12 / MDV20 : 5,5 cm (2-5/32’’)
MDV12 / MDV20 : 3,5 cm (1-3/8’’)
MDV8 : 4,5 cm (1-3/4’’)
MDV8 : 2,5 cm (1’’)
11 cm (4-5/16’’)
MDV8
Total length of rod:
Wall thi 14,7 cm (5-5/32’’)
MDV12/20
Total length of rod:
Wall thi 15,7 cm (6-3/16’’)
To heater
MDV8 - Total length of internal tube : wall thi 11 cm (4-5/16’’)
MDV12/20 - Total length of internal tube : wall thi 12 cm (4-3/4’’)
MDV8 - Total length of external tube : wall thi 13,5 cm (5-5/16’’)
MDV12/20 - Total length of external tube : wall thi 14,5 cm (5-11/16’’)
Thimble maximum length : 32 cm (12-5/8’’)
MDV12
: diameter 23 cm (9-1/16’
’)
MDV20
: diameter 27 cm (10-5/8’
’)
8
HEATER & VENTILATION INSTALLATION
The ventilation system consists of:
Take into consideration the area indicated for the gas connection.
1. Mark the 5/16” (8mm) mounting holes on wall.
For wooden walls use the wood screws provided
to mount heater to wall. Into drywall or where no
studs are available, drill and insert the anchor plugs
provided into mounting holes.
2. Mark the ventilation tube hole and the mounting
plate screws.
The ventilation must be rectilinear with a slight
downward sloap of 2 degrees towards the
exterior to avoid rain water infiltration.
3. Cut out ventilation opening in wall.
Install the indoor & outdoor mounting plates with
screws provided.
* MDV12 / MDV20 heaters only:
Assemble the wall thimble.
4. Prepare the rear spacers with mounting screws.
* The wallʼs thickness cannot be less than 4-1/2”
(11.5 cm) nor can it exceed 12-5/8” (32 cm).
Tube lengths and threaded mounting rod should
be trimmed to comply to the dimensions as shown
in figure 1.
1. Remove the front cover of the heater by removing
the control knob and the two (2) screws on the top
of the cover. To remove slide the front upwards.
2. After tubes have been cut to length, slide the
tubes and the rod into position on the heater
and adjust with the nut provided until you get a
compact unit. Slide the heater and ventilation
assembly through the hole in wall making sure
spacers are in place on mounting screws, until
the heater reaches the wall.
- For models MDV8 and MDV12, secure to the
wall with the three (3) screws and spacers.
- For model MDV20, secure to the wall with the
four (4) screws and spacers provided.
3. Check that hood protrudes the intended 4
- 5/16”
(11 cm) from the exterior wall.
4. Seal any imperfections between mounting plate wall and vent hood with putty, making sure that nothing falls inside the
hood as shown in figure 3 on next page.
Final Assembly
1x External tube (Air intake tube with enamel hood riveted), 1 x Internal tube (Outgoing flue gases)
1x Indoor mounting plate, 1x Outdoor mounting plate
1x Wall thimble (models MDV12 & MDV20 only), 1x Threaded mounting rod, 1x Adjusting nut
˃ Use the template provided with heater to mark wall mount installation and ventilation opening size.
Fig. 1