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www.DaikinApplied.com 73
IM 893-10 • ROOFPAK SINGLEZONE UNITS
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Control Actuators
The actuators are controlled by an analog signal from the unit
controller. Damper actuators utilize a 0-10 V (dc) analogs ignal
while modulating heating/cooling valve actuators utilize a 2-10
V (dc) signal. Spring-return actuators are used for the 0- 30%
outdoor air and economizer dampers. The mixing dampers are
normally closed to the outside air.
Figure 72: Control Actuators Wiring Diagram
Enthalpy Control
Outside Air Enthalpy Control (OAE)
Units with MicroTech III control and an economizer come
standard with an electromechanical enthalpy control device
(OAE) that senses both the humidity and temperature of the
outside air entering the unit. This device has an enthalpy scale
marked A through D.
shows the control points at
50% RH for settings A through D.
shows this scale
on a psychrometric chart. When the outside air conditions
exceed the setting of the device, the outside air dampers are
positioned to the minimum outside air intake position by the
MicroTech III controller.
Table 18: Enthalpy Control Settings
Control curve
Control point temperature at 50% RH
A
73°F (23°C)
B
70°F (21°C)
C
67°F (19*C)
D
63°F (17°C)
Figure 73: Enthalpy Control Settings
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