Desa DNV40NB - Manual (Page 6)

6 201835
DIRECT-VENT NATURAL GAS HEATER
DYNAVENT ®
Locating Thermostat on Wall
1. Locate thermostat 4 1 /
2
to 5 feet above
the floor on an inside wall away from
any heat sources. The thermostat needs
to sense average room temperature.
Avoid the following:
HOT SPOTS
Concealed pipes or ducts
Fireplaces
Registers
TV sets and radios
Lamps or direct sunlight
Kitchen
COLD SPOTS
Concealed pipes or ducts
Stairwells (drafts) or doors (drafts)
Unheated rooms on other side of wall
DEAD SPOTS
Behind doors
Corners and alcoves
2. Before installing thermostat, inspect the
wall, floor, and attic areas. Make sure
there are no pipes, wiring, or anything
else that would interfere with install-
ing thermostat. Do not mount thermo-
stat to stud. If there are any obstruc-
tions, choose a new location.
6. Attach thermostat to thermostat mount-
ing plate with screws provided (see Fig-
ure 4).
IMPORTANT: Note mounting
plate position in Figure 4. Correctly
position mounting plate for your model
furnace.
7. Insert thermostat mounting plate be-
tween wall and cabinet flange. Line up
top notch on mounting plate with top
screw on flange (see Figure 5).
IMPORTANT: Thermostat for 25,000
BTU/Hr model mounts on right side of
furnace (see Figure 5). Thermostat for
40,000 BTU/Hr model mounts on left
side of furnace (see Figure 5).
8. Insert screw in cabinet flange and ther-
mostat mounting plate and tighten firmly.
IMPORTANT: Make sure thermostat
wires do not touch combustion chamber.
INSTALLATION
(Continued)
.2 .3
.4
.5 .7 1. 0
SOLID STATE IGNITION
50 60 70 80 90
50 60 70 80 90
OFF
40,000 BTU/Hr Models
00000000000 00000000 00 0 0 00 00 00
00 00 00 00 00
SO LID S TA TE IG NIT IO N
50 60 70 80 90
50 60 70 80 90
25,000 BTU/Hr Models
40,000 BTU/Hr Models
Figure 5 - Inserting Thermostat Mounting
Plate Between Wall and Cabinet Flange
Figure 4 - Attaching Thermostat to
Thermostat Mounting Plate
.2
.3
.4
.5 .7 1. 0
SOLID STATE IGNITION
50 60 70 80 90
50 60 70 80 90
OFF
25,000 BTU/Hr Models
3. Provide two 18-gauge insulated stranded
wires for the thermostat wire. Also pro-
vide two wire nuts, and two wall anchors.
There is a red and a white thermostat wire
coming from the furnace. The extra ther-
mostat wires you furnish attach to these
wires. Make sure you furnish a red and a
white wire. This will insure correct
hookup. Purchase enough thermostat wire
to go from the furnace to the thermostat
location. Do not cut and splice this wire.
The thermostat wire must be unbroken.
Routing Thermostat Cable
All wiring must meet local codes. The fol-
lowing instructions cover routing the wire
through the attic. You can run wiring from
a basement or crawl space.
1. Unplug furnace.
2. Before drilling hole in wall, drive a small
finishing nail through ceiling directly
above thermostat location. Pull nail out
and push a small stiff wire through hole.
This helps you locate thermostat mount-
ing location when in attic.
3. In attic, locate stiff wire. Drill 1/2" hole
in center of ceiling wall plate next to
stiff wire. Remove wire.
4. Probe through drilled hole in wall plate
with a stiff wire to make sure there are
no pipes, wiring, or anything else
blocking the way for thermostat wires.
If you find blockage, choose new loca-
tion for thermostat.
5. Drill a 1/2" hole through the wall at
thermostat mounting location.
6. From attic, feed thermostat wires
through hole in ceiling plate until wires
reach thermostat location.
7. Make a small hook with a piece of stiff
wire. Run wire hook through 1/2" hole
in wall. Hook thermostat wires. Pull
wires through hole in wall. Make sure
6" of wires stick out.
8. Drive a small finishing nail in ceiling
above furnace.
25,000 BTU/Hr Model - Drive nail
above right side of furnace.
40,000 BTU/Hr Model - Drive nail
above left side of furnace.
Pull nail out and push a small stiff wire
through hole. This helps you locate wire
routing location when in attic.
9. Repeat steps 3 and 4 above.