Viconics VZ7656H Wireless Installation Guide - Manual (Page 4)

4 | VZ7656R & VZ7656H-Installation Guide

Remote discharge air sensor input for monitoring and control purpose.
-
System efficiency feedback.
- Discharge high limit heating lockout.
- Discharge low limit cooling lockout.
 Remote return air sensor input for monitoring control.
-
System efficiency feedback.
- Return high limit heating lockout.
- Return low limit cooling lockout.
- Communication lost control function.

Password protected configuration menu and lockable keypads for security.

A configurable digital input for added flexibility. The input can be configured as the
following:
 None: No function will be associated with the input.
 Service: a backlit flashing Service alarm will be displayed on the Terminal
Equipment Controller LCD screen when the input is energized. It can be tied in
to the AC unit control card, which provides an alarm in case of malfunction.
 Filter: a backlit flashing Filter alarm will be displayed on the Terminal
Equipment Controller LCD screen when the input is energized. It can be tied to a
differential pressure switch that monitors filters.
 RemNSB: remote NSB timer clock input. Will disable the internal scheduling of
the Terminal Equipment Controller. The scheduling will now be set as per the
digital input. The menu part related to scheduling is disabled and no longer
accessible. It provides low cost setback operation via occupancy sensor or from
a dry contact.
 RemOVR: temporary occupancy contact. Disables all override menu function of
the Terminal Equipment Controller. . The override function is now controlled by a
manual remote momentarily closed contact. When configured in this mode, the
input operates in a toggle mode.
 With this function enabled it is now possible to toggle between unoccupied &
occupied setpoints for the amount of time set by parameter (TOccTime)
temporary occupancy time.

Automatic smart fan operation saves energy during unoccupied periods.

Non volatile EEPROM memory prevents loss of parameters during power shortage.

Configurable SPST output relay on scheduling models for lighting, exhaust fan or
fresh air control.

6 hour typical reserve time for clock in case of power loss.

Built in 0 to 10 VDC by-pass damper / VFD output logic for static pressure control.
-
Built in static pressure loop control.
- 0 to 5 VDC static pressure input.
Easy configuration and self-binding operation

Easy configuration without using any special software or additional tools.

Can be used as stand-alone or with
BACnet™ MS-TP supervision controller for
monitoring purposed.

Truly scalable in terms of supported number of zones and RTU units.
Heat pump model specific features

Selectable single or dual stage compressor stages

High balance point:

Locks out auxiliary heating when outside air temperature is above this value.

Low balance point:
Locks out heat pump compressor operation when outside air temperature is below
this value.

Compressor/auxiliary interlock:
Adds flexibility by locking out heat pump operation during auxiliary heating, to prevent
high pressure trip when the coil is downstream of the auxiliary heat source.