Controls
GENERAL— System powered or duct pressure controls used
with Moduline® terminals provide both volume and tem-
perature control without the need for separate pneumatic or
electric energy. The plenum pressure supplies the power re-
quired by the control devices. The standard 37HS control
arrangement is shown in Fig. 24. Figure 25 shows the vari-
able air volume system-powered controls installed on the unit.
NOTE: Although 37A, 37C and 37HS controls operate on
similar principles, the pressure relationships between the 3
models of units are different. Therefore, 37HS units cannot
be operated with 37A or 37C controls.
CONTROL ARRANGEMENTS — Table 2 shows the
many control combinations available for 37HS Moduline air
terminals and the control packages required for each set of
functions. Figure 26 shows the installation of 3 control
arrangements.
Fig. 24 — Standard 37HS Control Arrangement
AIR FILTER
ASPIRATOR
THERMOSTAT
SPRING
CLIP
VOLUME CONTROLLER
Fig. 25 — Variable Air Volume Controls
Installed on Unit
15
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