Control Equipment
c
n
e
p
t
r
o
n
NEP04/03
PAGE 8
www.hvacquick.com 877-711-4822
PTC
program level organization: cont.
Push
MENU
again. The fourth program level mes-
sage ( C b ) will be displayed for 2 se-
conds, fol lowed by the setpoint of
contact B
. The format is the same as described
above for
contact A
, and adjustments to the setpoint
are made in the same way.
Contact A and Contact B are totally independent.
You may select two heating contacts, two cooling
contacts, or one heating and one cooling contact.
Their setpoints can be wherever you choose.
Push
MENU
again. The fifth program level message
( S b ) will be displayed for 2 seconds,
followed by the
night set back
deadband
. This is the total deadband (over and
under the setpoint) applied when the night set back
terminal is connected to common.
Using the
up
or
down
button, adjust the night set
back deadband to the value
required and press
ENTER
to
store that value in memory.
Push
MENU
again. The sixth program level message
( P b ) will be displayed for 2 se-conds,
followed by the
proportional band
.
The
ptc
operates using a p.i. algorithm, with the
integral terms optimized automatically by the ther-
mostat. But since the proportional band has the
greatest effect on the output, adjusting the propor-
tional band
4
will allow you to tailor the response of the ptc to any
given application. For most V.A.V applications, the
usual proportional band is 2 to 3
0
C (3.5 to 5.5
0
F ). For
many applications where hot or chilled water coil is
used, a typical proportional band is 3 to 6 degrees
0
C
(5.5 to 10.5
0
F).
Using the
up
or
down
buttons, adjust the propor-
tional band to the value re-
quired. Press the
ENTER
button to store the value in memory.
Push
MENU
again. The seventh program level mes-
sage ( r l c ) will be displayed followed by
the soft start ramp time. Since the soft
start feature is only useful if modulating electric heating
is used, you may disable this feature. To turn off the
soft start function, set the soft start ramp time to 00. If
modulating electric heating is used, normally the soft
start ramp time is set the same as the morning warm
up period.
Push the up or down buttons to set the soft start
ramp time to the number of
minutes required.
Push the
ENTER
button to store this value in memory.
3
5
6
7
