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Getting Started
A. Design and Installation Considerations
Hearth & Home Technologies direct vent gas appliances
are designed to operate with all combustion air siphoned
from outside of the building and all exhaust gases expelled
to the outside. No additional outside air source is required.
Outdoor Spaces
For the purposes of these instructions, an appliance is
considered to be outdoors if installed with shelter no more
inclusive than:
1. With walls on all sides, but no overhead cover
2. Within a partial enclosure which includes an overhead
cover and no more than two side walls. These side walls
may be parallel, as in a breezeway, or at right angles to
each other; or
3. Within a partial enclosure which includes an overhead
cover and three sidewalls, as long as 30% or more of
the horizontal periphery of the enclosure is permanently
open.
Note: Screen may be used on the open sides of the shelter,
14x18 and 16x18 screen mesh is approved for use. DO
NOT use solar screen or no-see-um screen.
The TWILIGHT-II-MDC has been carefully engineered to
provide a unique fireplace experience. Since it is different
than any other product on the market, care must be taken
when installing this appliance so that our customer does
not experience undesirable performance or conditions.
1. Install the appliance according to this Installation
Manual paying particular attention to flashing and
sealing instructions.
2. In the cold northern climates pay attention to expo-
sures and prevailing wind conditions when locating
the appliance, the same as you would for locating ex-
terior windows and doors.
The TWILIGHT-II-MDC has the thermal characteristics of a
high quality window system. Temperatures near the appli-
ance will be cooler than what is realized with a fully insulated
wall.
Operation of the appliance will eliminate any cool drafts
and will provide the room with a comfortable ambiance.
Installation MUST comply with local, regional, state and
national codes and regulations. Consult insurance car-
rier, local building inspector, fire officials or authorities
having jurisdiction over restrictions, installation inspec-
tion and permits.
Outdoor Lifestyles by Hearth & Home Technologies • TWILIGHT-II-MDC Installation Manual • 2369-970 Rev. L • 8/19
Before installing, determine the following:
• Where the appliance is to be installed.
• Gas supply piping requirements.
• Electrical wiring requirements.
• Framing and finishing details.
• Whether optional accessories—devices such as a fan,
wall switch, or remote control—are desired.
Installation and service of this appliance should be performed by
qualified personnel. Hearth & Home Technologies recommends
HHT Factory Trained or NFI certified professionals.
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualified
service technician, service agency or your dealer.
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