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Jefferson Direct Vent/Natural Vent Gas Heater
Gas Specifications
Model
Fuel
Gas Control
JDVBRN
Nat
JDVBRP
Prop
Weight: Fully assembled; 350 lbs.
Gas Inlet and Manifold Pressures
Inlet Minimum
Inlet Maximum
Manifold Pressure
The installation of your CFM Corporation stove must
conform with local codes, or in the absence of lo-
cal codes, with the National Fuel Gas Code ANSI
Z223.1/NFPA 54 - latest edition, or CSA B149.1
Installation code. (EXCEPTION: Do not derate this
appliance for altitude up to 4,500 feet (1,370 m).
Maintain the manifold pressure at 3.5" w.c. for Natural
Gas and 10.0" w.c. for LP Gas.
High Elevations
Input ratings are shown in BTU per hour and are
certified without deration for elevations up to
4,500 feet (1,370m) above sea level.
For elevations above 4,500 feet (1,370m) in USA,
installations must be in accordance with the
current ANSI Z223.1/NFPA 54 and/or local codes
having jurisdiction.
In Canada, please consult provincial and/or local
authorities having jurisdiction for installations at
elevations above 4,500 feet (1,370m).
WARNING: Improper installation, adjust-
ment, alteration, service or maintenance
can cause injury or property damage. Refer
to this manual for correct installation and
operational procedures. For assistance or
additional information consult a qualified
installer, service agency, or the gas supplier.
88
Max.
Min.
Input
Input
BTU/h
BTU/h
Millivolt
28,000
20,000
Millivolt
28,000
19,000
Natural
LP (Propane)
5.5" w.c.
11.0" w.c.
14.0" w.c.
14.0" w.c.
3.5" w.c.
10" w.c.
Horizontal Termination -
Direct Vent ONLY
The vent must rise vertically a minimum of 24" (610mm)
off the top of the unit, before the first elbow. The hori-
zontal run may extend up to 20' (6 m) and include a
vertical rise of up to 40' (12 m). (Fig. 7) Horizontal ter-
mination must also meet the criteria shown in Figures 9
through 11.
•
Approved vent systems must terminate above and
including the heavy line in Figure 7.
•
Two 45˚ elbows may be substituted for each single
90˚ elbow.
•
With a rise between 2' - 6', one 90˚ or two 45˚ elbows
may be used.
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
three 90° Elbows
25
24
23
22
21
20
19
18
16
15
14
13
12
11
10
9
8
7
6
5
4
3
One 90°
Elbow
2
1
0
1 2
3
4
5
6
7
8
Horizontal Run (in feet)
Fig. 7 Horizontal vent termination window.
May use up to
Unacceptable
Venting Configuration
9 10 11 12 13 14 15 16 17 18 19 20
30004177
ST134a
FDV28
Horizontal
vent run
12/3/99 djt
areas modified
1/11/00 djt
ST134a
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