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Vermont Castings Jefferson Direct Vent/Natural Vent Gas Heater
20002191
Weight: Fully assembled; 350 lbs.
Jefferson Direct Vent/Natural Vent
Certified to:
ANSI Z21.88b-2001 / CSA 2.33b-2001
Vented Gas Fireplace Heaters
The installation of your Vermont Castings stove must
conform with local codes, or in the absence of local
codes, with the National Fuel Gas Code ANSI
Z223.1 - latest edition, or CSA B149.1 Installation
code. (EXCEPTION: Do not derate this appliance for
altitude up to 4,500 feet (1,370m). 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 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.
Gas Specifications
Max. Min.
Input Input
Model Fuel Gas Control BTU/h BTU/h
JDVRN Nat Millivolt 28,000 20,000
JDVRP Prop Millivolt 28,000 19,000
Natural LP (Propane)
Inlet Minimum 5.5” w.c. 11.0” w.c.
Inlet Maximum 14.0” w.c. 14.0” w.c.
Manifold Pressure 3.5” w.c. 10.0” w.c.
Gas Inlet and Manifold Pressures
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 horizon-
tal run may extend up to 20’ (6m) and include a vertical
rise of up to 40’ (12m). (Fig. 7) Horizontal termination
must also meet the criteria shown in Figures 10 through 12.
• 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.
ST134a
Fig. 7 Horizontal vent termination window.
20
19
18
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
12 3456789101112 13 14 15 16 17 18 19 20
Vertical Run (in feet)
(Measured from the appliance flue collar to the top of the vent pipe.)
Horizontal Run (in feet)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
May use up to
three 90° Elbows
One 90°
Elbow
Unacceptable
Venting Configuration