info@jacksonsystems.com
07-27-2004
Manual balance dampers should be installed on all branch runs to facilitate the balancing
317.788.6800
High limit (HL-170 or HL-170-HP) and low limit (FS-38) thermostats are required on all
Both round and rectangular zone dampers have an adjusting screw that can be used to set
the minimum airflow.
of the air system.
There are two methods that can be used to insure proper airflow with zone control systems.
zone control systems.
damper be set to bleed about 20% of its air (or more, if necessary).
Ductwork Sizing For Z-300 Two-Position Zone Control Systems
bypass just enough air to maintain a quiet, draft-free system.
Fax: 317.227.1034
(2) If more than two zones are required, install a bypass damper. It should be set to
5418 Elmwood Avenue Indianapolis, IN 46203-6025
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Comfort SystemTM
(1) If only two zones are required, size each zone to handle about 75% of the total
substantially more CFM than the other, it is recommended that the larger zone
system CFM. This method does not require a bypass damper. If one zone requires
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