32
Space Relative Humidity Sensors —
Space Relative Humidity Sensors are not used with
50HCQ units at this time.
Smoke Detector/Fire Shutdown (FSD) —
This function is available only when PremierLinkt
controller is configured for (Space) Sensor Mode. The unit
is factory−wired for PremierLink FSD operation when the
PremierLink controller is factory−installed.
On 50HCQ units equipped with factory−installed Smoke
Detector(s), the smoke detector controller implements the
unit shutdown through its NC contact set connected to the
unit’s CTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The PremierLink
controller communicates the smoke detector’s tripped
status to the CCN building control. See Fig. 39
(PremierLink wiring schematic).
Filter Status Switch —
This function is available only when the PremierLink
controller is configured for (Space) Sensor Mode.
PremierLink controller can monitor return filter status in
two ways: By monitoring a field−supplied/installed filter
pressure switch or via supply fan runtime hours.
Using switch input: Install the dirty filter pressure switch
according to switch manufacturer’s instructions, to
measure pressure drop across the unit’s return filters.
Connect one side of the switch’s NO contact set to CTB’s
THERMOSTAT−R terminal. Connect the other side of the
NO contact set to TB1−10. Setpoint for Dirty Filter is set
at the switch. See Fig. 50.
R
TB1
J4-4
PL
Filter Switch (NO, close on rising pressure (high drop))
CTB
Thermostat
10
C08216
Fig. 50 − PremierLink Controller Filter Switch
Connection
When the filter switch’s NO contact set closes as filter
pressure drop increases (indicating dirt−laden filters), the
input signal to the PremierLink controller causes the filter
status point to read “DIRTY”.
Using Filter Timer Hours: Refer to the PremierLinkt
Controller Installation, Start−up, and Configuration
Instructions for instructions on using the PremierLink
Configuration screens and on unit alarm sequence.
Supply Fan Status Switch —
The PremierLink controller can monitor supply fan
operation through a field−supplied/installed differential
pressure switch. This sequence will prevent (or interrupt)
operation of unit cooling, heating and economizer
functions until the pressure switch contacts are closed
indicating proper supply fan operation.
Install the differential pressure switch in the supply fan
section according to switch manufacturer’s instructions.
Arrange the switch contact to be open on no flow and to
close as pressure rises indicating fan operation.
Connect one side of the switch’s NO contact set to CTB’s
THERMOSTAT−R terminal. Connect the other side of the
NO contact set to TB1−8. Setpoint for Supply Fan Status
is set at the switch. See Fig. 51.
R
8
TB1
J4-6
PL
Fan (Pressure) Switch (NO, close on rise in pressure)
CTB
Thermostat
C08118
Fig. 51 − PremierLink Controller Wiring Fan Pressure
Switch Connection
Remote Occupied Switch —
The PremierLink controller permits a remote timeclock to
override the control’s on−board occupancy schedule and
place the unit into Occupied mode. This function may also
provide a “Door Switch” time delay function that will
terminate cooling and heating functions after a 2−20
minute delay.
Connect one side of the NO contact set on the timeclock
to CTB’s THERMOSTAT−R terminal. Connect the other
side of the timeclock contact to the unit’s TB1−2 terminal
(see Fig. 52).
R
2
TB1
PL
Time Clock
Remote Occupied
CTB
Thermostat
J4-12
C08214
Fig. 52 − PremierLink Controller Wiring
Remote Occupied
Refer to the PremierLinkt Controller Installation, Start−up,
and Configuration Instructions for additional information
on configuring the PremierLink controller for Door
Switch timer function.
50HCQ
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