Pure Humidifier ERDDR Series, Installation Instructions, Operation And Maintenance Manual

Page: 6 / 24

5
Location
The location selected must provide for electrical service,
cold or hot water supply, and sanitary drain.
When selecting a location, try to keep the humidifier
within 10 feet (305 cm) of the duct to avoid unnecessary
heat losses and condensation within the steam supply
line.
Visible “fog” will saturate and condense when it contacts
objects such as turning vanes, filters, fans, elbows, or
take
- offs. The warmer the air, the more easily it will
dissipate the visible steam. The most active and
warmest portion of the duct will provide better mixing of
the steam and air. The injection tube should be
mounted a minimum of 2 feet (61 cm) downstream from
an elbow or other uneven airflow area.
Avoid mounting the single - style injection tube closer
than 8 - 10 feet (244 - 305 cm) upstream of objects that
could become saturated and condense the steam
(reference paragraph above).
CAUTION: Do not humidify upstream of filters. Consult
factory.
Location of Controls
Fan Interlock Switch
PURE Humidifier Co. recommends the use of an airflow
proving switch or fan interlock to prove airflow prior to
humidifier cooperation. Humidifier operation without
airflow will result in over
- saturation of the air stream.
Airflow proving switches are available as optional
equipment
from your PURE Humidifier Co.
representative.
High - Limit Humidistat
PURE Humidifier Co. recommends the use of a duct
high
- limit humidistat to prevent humidifier operation
when the duct humidity level exceeds 85% relative
humidity. Humidifier operation above 85% relative
humidity can result in over
- saturation of the air stream.
High - limit humidistats are available as optional
equipment from your PURE Humidifier Co.
representative. The high limit humidistat should be 12
to 14 feet (365
- 427 cm) downstream from the humidifier
injection tube.
Smoke Detectors and Temperature Sensors
Smoke detectors should be located upstream from the
humidifier injection tube.
Temperature sensors should be located 12 to 14 feet
(365
- 427 cm) downstream from the humidifier injection
tube, or past any visible fog travel that may be greater
than this distance.
Injection Tube Installation
The injection tube should be installed in the center of the
duct. See Injection Tube and Flexible Hose Installation
on page 7 for details.
Injection tube should be pitched 2 inches (5 cm) per foot
(31 cm), back to the humidifier. If proper pitch cannot
be maintained, or the injection tube is mounted lower
than the humidifier, a drain “tee” will be required.
Install the tube with the steam ports injecting steam up.
NOTE: If narrow ducts (6”/15 cm or less, in height) are
utilized, install the tube with the steam ports injecting
with the airflow slightly (2 o’clock position).
Galvanized steel duct plates are provided to seal the
opening where the tube enters the duct.
Location