Data Sheet for Product

Auxiliary/Perimeter Heat
Optional auxiliary and perimeter heat can be configured to supply heating in addition to the
compressor. In heating mode, auxiliary and perimeter heat operate according to room load.
Safety Shutdown
Low Temperature
A low temperature condition can be detected through a digital input or when the mixed
temperature drops below a configurable limit. The OA damper closes and the fan shuts off.
The optional auxiliary hot water coil valve opens fully; optional auxiliary staged heat is turned
off. Perimeter heat continues to operate. The system may be configured to re-start
automatically after the condition clears, or to remain shut down until a manual reset.
Other Safeties
The Predator can also shut down the heat pump if a condensate overflow or refrigeration
alarm is detected. The Predator turns off the fan, closes the OA dampers and closes the coil
valves. The Predator indicates an alarm condition over the network, and remains shut down
until reset manually.
Off
In this mode, the compressors, auxiliary and perimeter heating coil valves/stages, and OA damper are
closed and the fan is off.
Occupancy Control
Occupancy Mode
The Predator controller defaults to the occupied mode of operation. Upon receipt of the 4-state
LonMark occupancy override (nviOccManCmd), the controller will switch to the appropriate
mode of operation. A brief summary of each mode follows below:
LonMark
Occupancy State
Mode Description
(0) Occupied Controller in Occupied mode and uses Occupied setpoints.
(1) Unoccupied Controller in Unoccupied mode and uses Unoccupied
setpoints.
(2) Bypass Controller temporarily in Occupied mode and uses Occupied
setpoints until the Bypass Time elapses. Controller then
returns to previous occupancy state.
(3) Standby Controller in Standby mode and uses Standby setpoints.
If a LonMark compatible occupancy schedule input (nviOccSchedule) is used, the
controller will use the modes and setpoints as shown above. This will allow the Predator
controller to utilize the scheduling properties of other devices on the LonTalk Network.
The occupancy signal could also come from a time clock, wall switch, or occupancy
sensor physically wired to one of the inputs of the Predator controller (see figure 3). This
occupancy signal could then be shared with other controllers via the Lon Network.
Bypass Mode
If enabled (through UCPT StptDialEn) and the Bypass button on the Predator room
sensor is pressed, the controller will be placed in the Bypass mode for the amount of
time specified by the controller’s configuration parameters (default 60 min. – see Table
Document No. 588-136 Page 3 of 11