17
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Outdoor Enclosure
INSTALLATION
MOUNTING (CONTINUED)
• Keypad/display with standard 5' (1.5 m) cable ships mounted to subpanel
in Outdoor Enclosure. Keypad/display must not come in contact with strip
heaters or block intake ventilation hood.
• If constant monitoring of unit is desired, or if unit is located in a severe
climate, a remote-mount keypad/display should be installed. Additional
cable lengths up to 500 feet (152 m) are available as an option for this
mounting confi guration.
• 16-gauge galvanized steel curbs (optional) are shipped unassembled for
ease of transporting to roof; they include all hardware for bolt-together
assembly, and all holes are matched before leaving factory. Curb must
be a minimum of 14" (356 mm) high. One 2" × 1/2" closed-cell curb
gasket with adhesive on one side is supplied with hardware. Gasket must
be installed between top of curb and base surface of Outdoor Enclosure
to prevent moisture from leaking into building from driving rain or melting
snow. Installation drawing is included.
• All piping from humidifi er to steam outlet is stainless steel pipe. Depending
on the application, tubing or DriSteem steam hose is recommended for
interconnecting piping from steam outlet to dispersion assembly.
STS OUTDOOR ENCLOSURE SEQUENCE
OF OPERATION
• Power is applied to Outdoor Enclosure:
•
If ambient temperature in enclosure is below
50 °F (10 °C), the strip heaters power up.
Strip heaters remain on until enclosure
reaches 50 °F (10 °C) to ensure that
enclosure temperature does not drop below
the freezing point.
•
When there is no call for humidity, an
aquastat maintains tank temperature at
the factory default of 70 °F (21 °C). This
temperature can be reset in the fi eld to be
from 40 to 180 °F (4 to 82 °C).
•
When the ambient temperature in the
enclosure reaches 85 °F (29 °C), two
ventilation fans turn on to cool the electronic
components. A high limit is also provided
to power down the STS if the enclosure
temperature reaches 150 °F (66 °C). In
a high limit situation, the ventilation fans
continue to run and once the enclosure
temperature falls below 130 °F (54 °C), the
STS automatically resumes normal operation.
•
A normally open drain valve is provided on
the STS Outdoor Enclosure to drain the tank
in the event of a power loss.
OM-7464
mc_012611_1545
OM-955
Left side:
36"
(914 mm)
Top:
Keep open
Back:
12"
(305 mm)
Right side:
24"
(610 mm)
Front:
36"
(914 mm)
mc_012611_1546
Steam piping
Roof surface
Curb
Water piping
Remote Vapor-logic keypad
Electrical con nec tions
Drain piping
Humidifi er in Outdoor Enclosure
FIGURE 17-1: TYPICAL ROOFTOP INSTALLATION OVERVIEW
FIGURE 17-2:
OUTDOOR ENCLOSURE CLEARANCES