Dt/Dth/Dr/Drh Unit Dimensions; Merit Series Dt/Dth/Dr/Drh - Lennox DT3025 Installation Instructions Manual

DT/DTH/DR/DRH Unit Dimensions - inches (mm)
FRAMING
SPACERS
(Top and Sides
and Rear)
Model No.
in.
DT/DR3025 DT/DR3025
DTH/DRH3025 mm
in.
DT/DR3530 DT/DR3530
DTH/DRH3530 mm
in.
DT/DR4035 DT/DR4035
DTH/DRH4035 mm
in.
DT/DR4540
mm
Meritt Series - DT/DTH/DR/DRH
Merit Series fireplaces are sealed-combustion (direct
t
vent), heat-circulating gas appliances. The appliances
utilize a 100 percent safety shut-off gas control with either
a Piezo ignition system or an electronic ignition system.
Models equipped with either electronic ignition or the op-
tional forced air fan assembly require 120V electrical con-
nection. Decorative trim kits, a brickaded firebox lining,
forced air fan assemblies, a wall thermostat (for use with
vented gas fireplace heater models only), and hand-held
remote ON/OFF controls are available as options. Refer
to table 1 for model designations.
The fireplace has provisions for side(s) or bottom entry for
gas piping. This appliance must be vented to the outside
and must not be connected to a flue servicing another ap-
pliance.
The appliance must be installed using only approved Lennox
concentric venting components (4-1/2 in. / 7-1/2 in.).
The millivolt gas valve used in non-electronic igni-
tion units is self-powered and does not require
120V power wiring.
A
G
TOP VIEW
B
2 (51)
E
D
FRONT VIEW
A B
19-7/8 30-1/8
505 765
24-7/8 35-1/8
632 892
29-7/8 40-1/8
759 1019
34-7/8 45-1/8
886 1146
(Louvered Front Model Shown)
*
CONCENTRIC FLUE
FLUE - 4-1/2 (114)
COMBUSTION AIR - 7-1/2 (190)
*
DT/DTH - top flue only
DR/DRH - rear flue only
7 (178)
NOTE - Eyebrow
hood shown as positioned
in louvered front model.
3 (76)
ELECTRICAL
INLET
2-3/4x2 (70x51)
COVER PLATE with
KNOCKOUT)
C
GAS INLET
(Either Side
and bottom)
3 (76)
C D
30-1/8 24-1/2
765 616
32-1/8 29-1/2
816 749
37-1/8 34-1/2
943 876
37-1/8 39-1/2
943 1003
FIGURE 1
Do not attempt to alter or modify the construction of the
appliance or venting components. Any modification or al-
teration of construction will void the warranty, certification
and approval of these units.
In vented gas fireplace heater models, burner operation
can be controlled by: a unit- or wall-mounted ON / OFF
switch, or an approved thermostat.
In vented gas fireplace models, burner operation can be
controlled by: a unit- or wall-mounted ON / OFF switch.
On models with the optional manually-modulated gas valve,
flame appearance and heat output can be controlled at the
gas valve.
Models Listed
to Vented Gas
Fireplace
Standard
DT/DR3025
DT/DR3530
DT/DR4035
DT/DR4540
*DRH/DTH models available with louver front only.
P a g e 2
**
DR/DRH - rear flue only
16
(406)
1/2 (13)
2 (51)
9-3/4
(248)
1-5/8
(42)
RIGHT SIDE VIEW
E **F
18-1/4
14
356 464
16 20-1/4
406 514
21 25-1/4
641
533
21 25-1/4
533 641
TABLE 1
Models Listed to
Suffixes Used with
Vented Gas
Fireplace Heater
Standard
C - Louver front
DTH/DRH3025
F - Flush-Faced Front*
N - Natural Gas
DTH/DRH3530
P - Propane Gas (LP)
M - Millivolt System
DTH/DRH4035
E - Electronic system
F**
G
9-15/16
252
12-7/16
316
14-15/16
379
17-7/16
443
Both Models