Viconics VT7600W Installation Manual User Manual

Page 27

27 | PIR Ready VT76xxW Series-Installation Guide

Pband
Proportional Band
setting
Default value 2 = 2.0
°F ( 0.6 °C )

Adjust the proportional band used by the Terminal Equipment
Controller PI control loop.

Note that the default value of 2.0 °F ( 1.1 °C ) gives
satisfactory operation in most normal installation cases.
The use of a superior proportional band different than

the factory one is normally warranted in applications where the
Terminal Equipment Controller location is problematic and leads
to unwanted cycling of the unit. A typical example is a wall
mounted unit where the Terminal Equipment Controller is installed
between the return and supply air feeds and is directly influenced
by the supply air stream of the unit.

Value

F scale

Pband

C scale

Pband

2 F

1.1 C

3 F

1.7 C

4 F

2.2 C

5 F

2.8 C

6 F

3.3 C

7 F

3.9 C

8 F

4.4 C

Anticycle
Minimum on/off
operation time for
stages
Default value = 2
minutes

Minimum On/Off operation time of cooling & heating stages.

IMPORTANT, anti-short cycling can be set to 0 minutes for
equipment that posses their own anti cycling timer. Do not use this
value unless the equipment is equipped with such internal timer.
Failure to do so can damage the equipment.
0, 1, 2, 3, 4 & 5 minutes

Anti-short cycling can be set to 0 minutes for equipment that
posses their own anti cycling timer. Do not use that value unless
the equipment is equipped with such internal timer. Failure to do
so can damage the equipment.

% RH disp
Local RH Display
Default value = Off

Enables the display of humidity below the room temperature on the
display

On = Display %RH
Off = No display of %RH

cool cph
Heatpump stages
cycles per hour
Default value = 4
C.P.H.

Will set the maximum number of heatpump stage cycles per hour
under normal control operation. It represents the maximum number of
cycles that the equipment will turned on and off in one hour.
Note that a higher C.P.H will represent a higher accuracy of control at
the expense of wearing mechanical components faster.
3 or 4 C.P.H.