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Viconics VZ7656H Wireless Installation Guide User Manual

Page 21

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21 | VZ7656R & VZ7656H-Installation Guide

Dis LL

Discharge air temperature low
limit

Default: 45°F

Discharge air low temperature value at which the cooling
stages will be locked out.

35 to 65°F (2.0°C to 19.0°C)

(increments: 0.5° or 5°)

Anticycl

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 possess their own anti cycling timer.

Do not use this value unless the equipment has the above

mentioned internal timer. Failure to follow this guideline

may lead to damaged equipment.

0, 1, 2, 3, 4 & 5 minutes.

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

maximum number of cycles that the equipment will be

turned on and off in the span of an hour.

Note that a higher C.P.H will represent a higher accuracy

of control at the expense of wearing down mechanical

components faster

.

3, 4, 5, 6,7 & 8 C.P.H.

Cool cph

Cooling stages cycles per

hour

Default value = 4 C.P.H.

Will set the maximum number of cooling stage cycles per

hour under normal control operation. It represents the

maximum number of cycles that the equipment will be

turned on and off in the span of an hour.

Note that a higher C.P.H will represent a higher accuracy

of control at the expense of wearing down mechanical

components faster.

3 or 4 C.P.H.

Deadband

Minimum deadband

Default value = 2.0 °F (1.1 °C)

Minimum deadband value between the heating and

cooling setpoints.

Used only with the setpoints used during communication

failure (ComLost Alarm) while operation is under the

return air sensor. If modified, it will be applied only when

any of the setpoints are modified.

2, 3 or 4 °F ( 1.0 to 2.0 °C )

Units
Sets the display scale of the
controller

Default value = Imp

0 = SI for Celsius / Pa pressure scale.

1 = Imp for Fahrenheit / in. WC pressure scale.

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