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Fig. 43. The outdoor air CO
economizer outside air hood.
COVER REMOVED
Fig. 43 - - Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO
power supply is required for this sensor. A two- - wire cable
is required to wire the dedicated power supply for the
sensor. The two wires should be connected to the power
supply and terminals 1 and 2.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 41. Connect the 4 to 20 mA
terminal to the TB3- - 13 terminal of the 50HCQ. Connect
the SIG COM terminal to the TB3- - 11 terminal of the
50HCQD. See Fig. 44.
IAQ Sensor
SEN
COM
24 VAC
Fig. 44 - - Outdoor CO
Smoke Detector/Fire Shutdown (FSD) —
This function is available only when PremierLink is
configured for (Space) Sensor Mode. The unit is
factory- - wired for PremierLink FSD operation when
PremierLink 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
communicates the smoke detector's tripped status to the
CCN building control. See Fig. 35, the PremierLink
wiring schematic.
Filter Status Switch —
This function is available only when PremierLink is
configured for (Space) Sensor Mode.
sensor must be located in the
2
SIDE VIEW
C07135
Sensor: A dedicated
2
PL
TB3
13
J5-2
TB3
11
J5-3
C10285
Sensor Connections
2
PremierLink control 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 TB3- - 10. Setpoint for Dirty Filter is set
at the switch. See Fig. 45.
Filter Switch (NO, close on rising pressure (high drop))
Fig. 45 - - PremierLink 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 PremierLink causes the filter status point to
read "DIRTY".
Using Filter Timer Hours: Refer to Form 33CS- - 58SI for
instructions on using the PremierLink Configuration
screens and on unit alarm sequence.
Supply Fan Status Switch —
The PremierLink control 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 TB3- - 8. Setpoint for Supply Fan Status
is set at the switch. See Fig. 46.
Fan (Pressure) Switch (NO, close on rise in pressure)
Fig. 46 - - PremierLink Wiring Fan Pressure Switch
Connection
Remote Occupied Switch —
The PremierLink control permits a remote timeclock to
override the control's on- - board occupancy schedule and
25
CTB
Thermostat
R
TB3
PL
10
J4-4
C10286
CTB
Thermostat
R
TB3
PL
J4-6
8
C10287
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