Viconics VT7600 Installation Guide (Current Release 5000 Series PIR Ready) - Manual (Page 4)

4 | PIR Ready VT7600 Series-Installation Guide
• Remote discharge air sensor input for monitoring purpose
• System efficiency feedback
ƒ Lockable keypads for tamper proofing. No need for Terminal Equipment Controller guards
• Automatic frost protection to prevents costly freeze damage
• Anti short cycle and minimum on/off run time protection. Reduces wear and
maximizes life span of mechanical equipment.
• 2 configurable digital inputs for added flexibility. Each input can be configured as the
following:
ƒ None: No function will be associated with the input
ƒ 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.
ƒ 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 monitor filters
ƒ Rem NSB: 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
ƒ 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.
ƒ 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.
ƒ Fan lock: used in conjunction with a local air flow sensor connected to the input.
Locks out the Terminal Equipment Controller heating and cooling action and
displays a local alarm if no air flow is detected 10 seconds after the fan (G
terminal) is energized.
• Configurable smart fan operation saves energy during night mode
• Non volatile EEPROM memory prevents loss of parameters during power shortage
• Built in default profile set-up for easier start up and commissioning
• 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
• 0 to 10 VDC economizer output for more retrofit opportunities
• Built in dry bulb economizer logic using outdoor temperature sensor
• Input for supply/mixed air temperature sensor
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
• Comfort/economy mode:
• In economy mode, heat pump use is maximized before turning On auxiliary heating
• 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.