Series ETSV - Models 40, 80
September 14, 2020
Page 16
Note:
Horizontally vented heaters must be individually vented and cannot use a common vent�
Combustion Air Supply (Optional)
Outdoor Installation
•
An outside combustion air supply is strongly recommended if the building space encloses a negative pressure due to ex-
haust etc� or if the building contains materials which would expose the heater to halogenated hydrocarbon atmospheres�
•
The outside air terminal must be of an approved type and should be located at an elevation equal to or below the vent
terminal elevation to prevent back-venting of flue gases into the burner compartment�
•
Install single wall pipe or PVC pipe and fittings with a 12” linear section of flexible duct to allow movement of the heater� Do
not use flexible duct throughout the entire length of fresh air duct� This may cause nuisance air switch tripping�
•
Optional: Fresh Air Kit #CT168
When a heater is to be mounted outdoors it must be installed in such a way that wind will have minimum effect on its move-
ment� This consideration is intended to eliminate undue stress on the gas flex connector� A vent terminal of the approved type
(Kit # CT011) must be used and all connections must be sealed with a high temperature sealant that can withstand 400°F�
To Outside Air:
Directly to outside or
to common ductwork
from blower
Pipe
Flex Duct
Air Flow
Direction
