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Temperature Compensated Start — This funct ion will run
when the controller is in unoccupied state and will
calculate early start bias time (SBT) based on space
temperature deviation from occupied setpoints in minutes
per degree. The following conditions will be met for the
function to run:
S Unit is in unoccupied stat e
S Next occupied time is valid
S Current time of day is valid
S Valid space temperature reading is available (fromsensor
or linkage thermostat)
S Cool Start Bias (KCOOL) and Heat Bias Start (KHEAT)
> 0 in the CONFIG configuration table
The SBT is calculated by one of the following formulas
dependi ng on temperat ure demand:
If SPT > OCSP then SBT = (SPT -- OCSP) * KCOOL
If SPT < OHSP then SPT = (OHSP -- SPT) * KHEAT.
The calculated start bias time can range from 0 to 255
minutes. When SBT is greater than 0 the function will
subtract the SBT from the next occupied time to calculate
a new start time. When a new start time is reached, the
Temperature Compensated Start mode is started. This
mode energizes the fan and the unit will operate as though
it is in occupied state. Once set, Temperature
Compensated Start mode will stay on until the unit returns
to occupied state. If either Unoccupied Free Cool or IAQ
Pre--Occupancy mode is active when Temperature
Compensated Start begins, the ir mode will end.
Door Switch — The Door Switch function is designed to
disable mechanical heating and cooling outputs when the
REMOCC c ontact input is closed (in the ON state) after a
programmed time delay. The fan will continue to operate
based on the current mode and the ASHRAE 90.1 Supply
Fan setting. The delay is programmable from 2 to 20
minutes by setting the Remote Cont/Door Switch decision
in the SERVICE table to a value equal to the number of
minutes desired. When the contac t is open (in the OFF
state), the PremierLink controller will resume normal
temperature control.
This application is designed for use in schools or other
public places where a door switch can be installed to
monitor the opening of a door for an extended period of
time. The controller will disable mechanical cooling and
heat ing when the door is open for a programmed amount
of time.
This function can also be used to monitor a high
condensat e level switch when installed on a water source
heat pump to disable mechanic cooling in case of a
plugged evaporator condensate pan drain.
Linkage — The Linkage function in the Premie rLink
controller is available for applications using a Linkage
thermostat or the 3V control system. If using the Linkage
thermostat, both the PremierLink controller and the stat
must be on the same CCN bus. When used as the air
source for a 3V control system, the PremierLink controller
is not required to be on the sa me CCN bus but it is
recommended. Linkage will be active when it is initiated
from the Linkage thermostat or the 3V Linkage
Coordinator through CCN communications and requires
no configuration. Only one device can be linked to the
PremierLink controller.
Once Linkage is active, the PremierLink controller’s own
SPT, temperature setpoints, and occupancy are ignored
and the controller will use the information provided by the
remote linkage device. The following information will be
received from the remote linked device and can be viewed
in the maintenance display table:
S Supervisory Elem ent
S Supervisory Bus
S Supervisory Block
S Average Occupied Heat Setpoint
S Average Occupied Cool Setpoint
S Average Unoccupied Heat Setpoint
S Average Unoccupied Cool Setpoint
S Average Zone Temp
S Average Occupied Zone Temp
S Occ upancy Status
In return, the PremierLink controller will provide its SAT
and operating mode to the linked device.
It will convert its operating modes to Linkage modes. See
Table 31.
Table 31 – Linkage Modes
ROOFTOP MODE VALUE LINKAGE MODE
Demand Limit N/A N/A
Heat 3 Heating
Cool or Free Cooling 4 Cooling
IAQ Control N/A N/A
Temp. Compensated
Start Heat
2 Warm---up
Temp. Compensated
Start Cool
4 Cooling
IAQ Purge 6 Pressurization
Occupied
(Indoor Fan ON)
4 Cooling
Unoccupied Free
Cool
5
Unoccupied Free
Cooling
Fire Shutdown 7 Evac
Factory/Field Test 1 Off
Off 1 Off
48TC