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UVS33/36 Vent-Free Heaters
20002211
Gas Specifications
Model Fuel Gas Control Max. Min. Orifice Air
Input Input Size Shutter
BTU/H BTU/H Setting
UVS33RN Nat Millivolt Hi/Lo 20,000 15,000 #45 1/16"
Open
UVS33RP LP Millivolt Hi/Lo 20,000 14,750 #55 Fully
Open
UVS33RN Nat Millivolt Hi/Lo 15,000 10,750 #50 Closed
UVS33RP LP Millivolt Hi/Lo 15,000 11,000 #56 Fully
Open*
UVS33RN Nat Millivolt Hi/Lo 10,000 7,500 #52 Closed
UVS33RP LP Millivolt Hi/Lo 10,000 8,000 #62 Fully
Open*
UVS36RN Nat. Millivolt Hi/Lo 25,000 17,500 n/a Fully
Open
UVS36RP LP Millivolt Hi/Lo 25,000 18,750 n/a Fully
Open
* Use air shutter in orifice bag without round holes.
3. Frame in heater with a header across the top. It is
important to allow for finished face when setting the
depth of the frame.
4. Attach heater to frame using adjustable frame drywall
strips (located behind access door for shipping).
Preset depth to suit facing material (adjustable to
1/2", 5/8" or 3/4" depths). (Fig. 6)
5. Use existing screws in side of unit to attach drywall
strip. Measure from face of heater to face of drywall
strip to determine final depth. (Fig. 6)
FP1023
side nailing flange
1/27/00 djt
A
B
C
Adjustable Drywall Strip
(Nailing Flange)
Scew Drywall
Position Depths
A 1/2" (13 mm)
B 5/8" (16 mm)
C 3/4" (19 mm)
Adjustable 1/2",
5/8" & 3/4" Spac-
ing
FP1023
Fig. 6 Adjustable drywall strip (nailing flange).
Framing
Framing can take place before or after the heater is set
in place. The framing should be positioned to accom-
modate the wall covering and facing material. Framing
material should be 2x4 or heavier. Framing headers
may rest on top of heater. (Refer to Page 3, Figure 1
for heater and framing dimensions.)
Insulating for Cold Climates
When a heater is installed in a chase or an outside wall,
the enclosure should be insulated like any other wall
of the home. Insulation should be installed under the
heater and on the inside of the exterior walls. (Fig. 7)
NOTE: Insulating for cold climates is strictly a recom-
mendation and not a requirement.
GF456
UVC
2/19/97
Insulation meth-
ods shown are
optional for cold
climate, not a
requirement for
unit operation.
Insulation
FP546
Fig. 7 Insulating for cold climates.
Parts Identification
FP443a
UVC33
12/18/99 djt
Nailing
Flange
Gas
Line Access
(both sides)
Top
Louvre
Screen Panel
Logs and Burner
Firebox
Bottom Louvre
(Bottom access
door, controls behind louvre)
FP443a
Fig. 8 Parts identification.