82
Tempe rature Com pensated Start — This function will run
when the controller is in unoccupied state and will
calculate early start bias time (SBT) based on space
temperature deviat ion from occupied setpoints in minutes
per degre e. The following condit ions will be m et for the
function to run:
S Unit is in unoccupied state
S Next occupied time is valid
S Current time of day is valid
S Valid space temperature re ading is available (from sensor
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 temperature 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
Tempe rature Compensated Start mode is started. This
mode e nergizes 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, their mode will end.
Door Switch — The Door Switc h function i s designed to
disable mec hanical heating and cooling outputs when the
REMOCC contact 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 contact is open (in the OFF
state), the PremierLink controller will resume normal
temperature control.
This application is designed for use in schools or ot her
public places where a door switch can be installed to
monitor the opening of a door for an extended pe riod of
time. The controller will disable mechanical cooling and
heat ing when the door is open f or a programmed amount
of time.
This function can also be used to monitor a high
condensat e le vel switch when installed on a water source
heat pump to disable mechanic cooling in case of a
plugged e vaporator condensate pan drain.
Linkage — The Linkage func tion in the PremierLink
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 a s the air
source for a 3V control system, the PremierLink controller
is not required to be on the same 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 com munications and requires
no configuration. Only one device can be linked to the
PremierLink controller.
Once Linkage is active, the PremierLink controller’s own
SPT, tempera ture 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 Element
S Supervisory Bus
S Supervisory Block
S Average Occupied Heat Setpoint
S Average Occupied Cool Set point
S Average Unoccupied Heat Setpoint
S Average Unoccupied Cool Set point
S Average Zone Temp
S Average Occupied Zone Temp
S Occupancy Sta tus
In return, the PremierLink controller will provide its SAT
and operating mode to the linked device.
It will convert its operating m odes 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
Tem p . Com pe nsated
Start Heat
2 Warm --- up
Tem p . Com pe nsated
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
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