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CONTROL OPTIONS
Constant Volume
With this feature, when jack J15 Pin A is
connected to Pin B, the electronics will
cause the airflow to go to the maximum
setting and stay there. The influence of
the thermostat is removed and maxi-
mum flow is maintained at all times.
The operation of the three reheat relays
is unaffected. Connecting Pins A and B
of jack J15 will only affect the signal
which goes into the section of the
electronics which controls the air
damper movement. The maximum
flow option is obtained by saturating the
temperature voltage signal so that the
maximum limit is always sent on to the
section of the electronics, which
compares the temperature voltage to
the flow voltage.
10
Control
Options
Auto Dual Minimum
The auto dual minimum enables the
unit to change the minimum automati-
cally without an outside signal. The
minimum changes when the first stage
relay is activated. The electronics have
been designed so that when jack J18
Pins A and B are connected together,
Minimum B (Potentiometer R69) will
control whenever the first relay stage
activated. Therefore, no matter what
minimum was in control before the
relay stage was activated, after being
activated, Minimum B (R69) will be the
determining minimum flow. This option
can be used effectively with fan-
powered units where a minimum flow
is set as the damper modulates and
when the first stage comes on, the air
damper is then closed. In this manner,
airflow to the space is never inter-
rupted; however, the energy associated
with maintaining a minimum air
damper airflow at all times is saved.
VAV-SVX03A-EN
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