A SH / S-TRAC MANUAL
14 of 29 Feb 06
Indoor
1. A vertical chimney must be certified “A” or “L” or equivalent type on units without draft hoods. Type
“B” vent is acceptable on units with Engineered Air draft hoods. The vent size shall be selected
from appropriate approved Vent Table.
2. A vent connector shall be of approved material and installation. It shall have a minimum clearance
of 9" (229 mm) to combustible material. All horizontal portions of the venting system shall be
supported to prevent sagging. All horizontal runs shall have a minimum rise of 2% in the direction
of discharge. Horizontal vents shall be properly supported.
3. Units without draft hoods shall have individual chimneys.
4. This appliance shall not be connected to any portion of a mechanical draft system operating under
positive pressure.
5. See separate Supplemental Installation Instructions for units that have side wall venting.
Outdoor
Where appropriate, Engineered Air outdoor vent terminations may be provided. Attach the vent
termination securely to the unit casing using #8 X 5/8” (minimum) sheet metal screws with washers
at all holes provided.
When the chimney and flue cap are provided by others, install in accordance with the instructions
for the chimney and flue cap and to the requirements of the authorities having jurisdiction. The
chimney shall have a temperature rating equivalent to “A” vent and be suitable for outdoor
installation. Support the chimney independent of the unit.
HUMIDIFIER INSTALLATION
Supply Water
The supply water pressure range must be between 25 psi (172kPa) and 80 psi (551kPa). If using non-
metallic water piping, it must be rated to withstand 212°F (100°C).
Do not use heated supply water. The supply water also mixes with the drain water to temper the leaving
drain temperature. SH humidifiers may be ordered with 2 inlet water connections; one for boiling and one
for drain mixing. Refer to the mechanical drawing to determine each connection.
Engineered Air recommends installing a water hammer arrester.
Always install a supply water manual shut off valve at the humidifier.
Outdoor installations
A piping and wiring chase is provided on outdoor applications. The installing contractor shall provide
freeze protection for the supply water line on outdoor installations. A 3-way fill solenoid is
recommended to be installed indoors to allow the supply water line to drain in the event of a power failure.
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