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16
Controls
GENERAL
System-powered or duct pressure controls used with Mod-
uline
®
terminals provide both volume and temperature con-
trol without the need for separate pneumatic or electric ener-
gy. The plenum pressure supplies the power required by the
control devices. Figure 26 shows the variable air volume sys-
tem-powered controls installed on the unit. The standard
37HS control arrangement is shown in Fig. 27.
NOTE: Although 37A, 37C and 37HS controls operate on simi-
lar 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 re-
quired for each set of functions. Figure 28 shows the installa-
tion of 3 control arrangements.
Fig. 26 — Variable Air Volume Controls
Installed on Unit
Fig. 27 — Standard 37HS Control Arrangement.
AIR FILTER
ASPIRATOR
THERMOSTAT
SPRING
CLIP
VOLUME CONTROLLER