12
VAV-SVX03A-EN
Calibration
Set Minimum Flow(s)
In this section, two procedures for
setting minimums will be discussed.
No Dual Minimum
Adjust the thermostat knob to the full-
heat position (full clockwise). Monitor
the delta P of the transducer with a
pressure gage (high port first and low
port). Refer to the calibration label on
the side of the unit, which relates CFM
to delta P. Adjust R68 (minimum A) so
that both the red and green lights are
out at the desired minimum flow delta P.
If the minimum setting is to be zero flow,
then leave the minimum pot (R68) full
counter-clockwise so that the red light
remains on even when no delta P is
applied to the transducer. This will
ensure that the unit will always go to
closed when minimum is desired.
Auto Dual Minimum
Place jumper on J18-A to B.
The heating minimum is the minimum
at which the damper is controlled to
when the fan on a fan-powered unit is
activated or when the first relay is
activated on a reheat unit.
Set the thermostat to the full-heat
position (full clockwise).
Adjust minimum potentiometer R69
(Minimum B) to desired heating
minimum. If this setting is to be zero,
leave the potentiometer fully counter-
clockwise so that the amber light
remains on with no delta P applied to
the transducer.
Remove the jumper from J18-A to J18-
B. This puts the unit into the mode
where minimum A is now in control
(cooling minimum).
Adjust R68 (Minimum A) when both
lights are off when the condition is
satisfactory. If zero minimum is desired,
leave pot R68 full counter-clockwise so
that the amber light is on continuously
with zero delta P applied to the
transducer.
Replace J18 jumper.
