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Figure 3
shown below is typical Stryker CVAHU control application.
Control Provided
The Stryker CVAHU Controller is designed to
control a single air handler to maintain the unit's
space temperature at the current Setpoint. Heating
and cooling control are provided for either staged or
modulating equipment. Up to three stages of
mechanical cooling and up to three stages of
heating are allowed. Modulating outputs can be
either floating type such as a series 60 control, or
pulse width modulated (PWM) control. The
economizer dampers can be controlled directly with
floating or PWM outputs, or indirectly using a digital
output as an enable/disable signal to a packaged
economizer controller. The economizer enable
function, determines when to allow outdoor air for
free, cooling, can be configured, to one of the
strategies based on the inputs. When the
economizer position is controlled from the Stryker
CVAHU, the minimum position setting (for
ventilation requirements) is adjusted based on
Figure 3: Typical Stryker CVAHU control application
STRYKER CVAHU ZIO CONFIGURATION GUIDE
indoor air quality (IAQ) needs in the space. IAQ
monitoring is provided through either a CO
or a digital input from a space-mounted IAQ limit
switch.
For heat pump configurations, up to three
compressors can be controlled, along with up to
three stages of auxiliary heat, and a heat/cool
change over valve. Including the supply fan, a
combination of these items may not exceed eight
outputs in a Stryker CVAHU. The Stryker CVAHU
Controller can monitor a space-mounted occupancy
sensor, and a door/window contact. These inputs
affect the operational mode of the controller.
The Stryker CVAHU Controller allows other
controllers in the system to use the physical inputs
and outputs. A digital input and an analog input can
be configured to read switch states and voltage
sensor values, respectively, and send them out
over the S and LON-bus network.
11
sensor
2
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