B. Constructing the Appliance Chase
A chase is a vertical
NOTICE: Treatment of ceiling firestops and wall shield firestops 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, you MUST check local building codes to determine the requirements to these steps.
Chases should be constructed in the manner of all out- side walls of the home to prevent cold air drafting prob- lems. The chase should not break the outside building envelope in any manner.
Walls, ceiling, base plate and cantilever floor of the chase should be insulated. Vapor and air infiltration 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.
NOTICE: Measure heater dimensions and verify framing methods and wall covering details, before framing construction begins.
To further prevent drafts, the wall shield and ceiling fire- stops should be caulked with high temperature caulk to seal gaps. Gas line holes and other openings should be caulked with high temperature caulk or stuffed with un- faced insulation. If the appliance is being installed on a cement surface, a layer of plywood may be placed under- neath to prevent conducting cold up into the room.
C. Clearances
NOTICE: Install appliance on hard metal or wood surfaces extending full width and depth. DO NOT install directly on carpeting, vinyl, tile or any combustible material other than wood.
WARNING! Risk of Fire! Maintain specified air space clearances to appliance and vent pipe:
•Insulation and other materials must be secured to prevent accidental contact.
•The chase must be properly blocked to prevent blown insulation or other combustibles from entering and making contact with fireplace or chimney.
•Failure to maintain airspace may cause overheating and a fire.
Clearance to heat shield
The top and back of heater are defined by
The heat shield must be attached as shown if combustible materials are placed directly on top standoffs (Figure 5.3).
The minimum clearance to a perpendicular wall extending past the face of the heater is 1 in. (25 mm).
The back of the heaters may be recessed into combustible construction.
TOP STANDOFFS |
INSTALLED |
HEAT SHIELD |
HEAT SHIELD |
Figure 5.2 Heat Shield |
Note: Not intended for heater insert.
In planning the installation for the heater it is necessary to determine where the unit is to be installed, the type of flue system to be used (straight out, corner, or elevated), and whether optional accessories (wall switch or remote control) are desired. Gas supply piping should also be planned. Refer to the appliance data plate on the base pan of the heater for all gas pressures and input rate information.
The heater can be mounted on any of the following surface:
1.A flat surface (minimum 6 mm base).
2.Four (4) corner supports.
(Example: Four (4) concrete masonry blocks). These supports must be positioned so they contact all four (4) perimeter edges on the bottom of the unit.
Heater framing can be built before or after the heater is set in place. Framing should be positioned to accommodate wall covering and heater facing material. The heater fram- ing should be constructed of 2 in. X 4 in. (51 x 102 mm) lumber or heavier. The framing headers may rest on the heater standoffs. Refer to Figure 5.1 and Figure 5.3 for heater and framing reference dimensions.
Heat & Glo • | 21 |