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3
Installing the Appliance
Constructing the Appliance Chase
A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. Vertical vents that run
on the outside of a building may be, but are not required to
be, installed inside a chase.
CAUTION: TREATMENT OF FIRESTOP SPACERS AND
CONSTRUCTION OF THE CHASE MAY VARY WITH THE
TYPE OF BUILDING. THESE INSTRUCTIONS ARE NOT
SUBSTITUTES FOR THE REQUIREMENTS OF LOCAL
BUILDING CODES. THEREFORE, YOUR LOCAL BUILD-
ING CODES MUST BE CHECKED TO DETERMINE THE
REQUIREMENTS FOR THESE STEPS.
Factory-built appliance chases should be constructed in
the manner of all outside walls of the home to prevent cold
air drafting problems. The chase should not break the out-
side building envelope in any manner.
This means that the walls, ceiling, base plate and cantilever
floor of the chase should be insulated. Vapor and air infiltra-
tion barriers should be installed in the chase as per regional
codes for the rest of the home. Additionally, in regions where
cold air infiltration may be an issue, the inside surfaces
may be sheetrocked and taped for maximum air tightness.
To further prevent drafts, the firestops should be caulked to
seal gaps. Gas line holes and other openings should be
caulked or stuffed with insulation. If the appliance is being
installed on a cement slab, a layer of plywood may be placed
underneath to prevent conducting cold up into the room.
THE CHASE SHOULD BE CONSTRUCTED SO THAT ALL
CLEARANCES TO THE APPLIANCE ARE MAINTAINED
AS SPECIFIED WITHIN THIS OWNER'S MANUAL.
Step 1. Locating the Appliance
Space and clearance requirements for locating a appliance
within a room (see Figure 4).
Clearance Requirements
The top and back of the appliance are defined by stand-
offs. The minimum clearance to a perpendicular wall
extending past the face of the appliance is 3 inches (76mm).
The back of the appliance may be recessed 16 1/4 inches
(413mm) into combustible construction.
The distance from the unit to combustible construction is to
be measured from the unit outer wrap surface to the com-
bustible construction, NOT from the screw heads that se-
cure the unit together.
18
Heat & Glo • SL-550 / 750 / 950TR-D • 2044-985 Rev. J • 6/06
3" MIN. (76mm)
A
MODEL
VENTING
A
Top
49
SL-950TR-C
*
Rear
49
Top
42
SL-750TR-D
Rear
*
42
Top
37
SL-550TR-D
*
Rear
37
*
NOTE:
If venting with (2) 90
the dimensions C, D, and E, will change.
Figure 4.
Appliance Dimensions, Locations,
and Space Requirements
Minimum Clearances
from the Appliance to Combustible Materials
Glass Front ...................................... 36 ........ 914
Floor ................................................. 0 ........... 0
Rear ................................................ 1/2 ........ 13
Sides .............................................. 1/2 ........ 13
Top (SL-550TR-D) ......................... 1 1/2 ....... 38
(SL-750TR-D & SL-950TR-D) .. 3 1/4 ....... 83
Ceiling* ............................................ 31 ........ 787
* The clearance to the ceiling is measured from the top
of the unit, excluding the standoffs (see Figure 38).
Minimum Clearances
from the Vent Pipe to Combustible Materials
Vertical Sections. ............. 1 ................ 25
Horizontal Sections
Top ..................................... 3 ................ 75
Bottom ............................... 1 ................ 25
Sides ................................. 1 ................ 25
At Wall Firestops
Top .................................. 2 1/2 ............ 63.7
Bottom .............................. 1/2 ............... 13
Sides ................................. 1 ................ 25
For minimum clearances, see the direct vent termination
clearance diagrams in Figures 29 and 30 in this manual.
NOTE: When venting with a 90
ponent, an area 3" above the horizontal vent, the entire width
and depth of the firebox must be free of combustibles (see
Figure 5).
B
E
D
C
1/2 " MIN. (13mm)
B
C
D
E
16-1/4
35-3/8
50
70-3/4
16-1/4
40-1/8
57
80-1/4
16-1/4
31-7/8
45
63-3/4
16-1/4
36-5/8
52
73-1/4
16-1/4
29-3/8
41-1/2
58-3/4
16-1/4
34-1/8
48-1/2
68-1/4
0
elbows off rear of unit
Inches
mm
Inches
mm
0
elbow as the first vent com-
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