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Supply Air Temperature (SAT) Sensor —
On FIOP--equipped 48TC**16 units, the unit is supplied
with a supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6--inches (12.7
mm) in length. It is a nominal 10--k ohm thermistor.
The SAT is factory--wired. The SAT probe is wire--tied to
the supply--air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re--position the sensor in the flange of the supply--air
opening or in the supply air duct (as required by local
codes). Drill or punch a
1
/
2
--in. hole in the flange or duct.
Use the template provided in the unit control box. Use two
field--supplied, self--drilling screws to secure the sensor
probe in a horizontal orientation. See Fig. 48.
SUPPLY AIR
RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
C10020
Fig. 48 -- Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
NOTE: Refer to Form 33CS--67SI (or latest) for
complete PremierLink configuration, operating sequences
and troubleshooting information. Have a copy of this
manual available at unit set--up
NOTE: The sensor must be mounted in the discharge
airstream downstream of the cooling coil and any heating
devices. Be sure the probe tip does not come in contact
with any of the unit’s heater surfaces.
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory--mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
EconoMi$er2 —
The PremierLink control is used with EconoMi$er2
(option or accessory) for outdoor air management. The
damper position is controlled directly by the PremierLink
control; EconoMi$er2 has no internal logic device.
Outdoor air management functions can be enhanced with
field--installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO
2
sensor
Outdoor air CO
2
sensor
Refer to Table 3 for accessory part numbers.
Field Connections
Field connections for accessory sensor and input devices
are made at the 16--pole terminal block (TB3) located
beneath the PremierLink control (see Fig. 46). Some input
devices also require a 24--vac signal source; connect at
CTB terminal R at “THERMOSTAT” connection strip for
this signal source. See connections figures on following
pages for field connection locations (and for continued
connections at the PremierLink board inputs). Route wires
to control box as indicated in Fig. 39.
Table 4 provides a summary of field connections for units
equipped with Space Sensor. Table 5 provides a summary of
field connections for units equipped with Space Thermostat.
Table 3 – PremierLink Sensor Usage
APPLICATION
OUTDOOR AIR
TEMPERATURE
SENSOR
RETURN AIR
TEMPERATURE
SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY SENSOR
Differential Dry Bulb
Temperature with
PremierLink
(PremierLink requires
4 --- 20 mA Actuator)
Included ---
CRTEMPSN001A00
Required ---
33ZCT55SPT
or equivalent
--- ---
Single Enthalpy with
PremierLink
(PremierLink requires
4 --- 20mA Actuator)
Included ---
Not Used
---
Requires ---
33CSENTHSW
---
Differential Enthalpy
with PremierLink
(PremierLink requires
4 --- 20mA Actuator)
Included ---
Not Used
---
Requires ---
33CSENTHSW
or equivalent
Requires ---
33CSENTSEN
or equivalent
NOTES:
CO
2
Sensors (Optional):
33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 --- Aspirator b ox used for duct---mounted CO
2
room sensor.
33ZCT55CO2 --- Space temperature and CO
2
room sensor with override.
33ZCT56CO2 --- Space temperature and CO
2
room sensor with override and setpoint.
48TC**16