Viconics VT7606E Installation Manual User Manual

Page 22

| PIR Ready VT7600 Series-Installation Guide

028-0363-02

Pband

Proportional band setting

Default value

2 = 2.0 °F

(1.1 °C)

Adjust the proportional band used by the Terminal Equip-

ment 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 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 =

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.

Heat cph

Heating stages cycles

per hour Default value =

4 C.P.H.

Will set the maximum number of heating stage cycles per

hour under normal control operation. It represents the maxi-

mum number of cycles that the equipment will turn 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, 4, 5, 6,7 & 8 C.P.H.
For multi stage models, heat cph applies to W1 & W2
For heat pump models, heat cph applies to W1 only

(Emergency heat )