Supply Air Temperature Sensor; Field Connections - Carrier WeatherMaster 50HC14 Installation Instructions Manual

Supply Air Temperature (SAT) Sensor —
FIOP-equipped 50HC**14 units, the unit is supplied with a
supply-air temperature (SAT) sensor (33ZCSENSAT). This
sensor is a tubular probe type, approx 6-inches (152 mm) in
length. It is a nominal 10k 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 ship-
ping position. Remove the sensor for installation. Re-position
the sensor in the flange of the supply-air opening or in the sup-
ply air duct (as required by local codes). Drill or punch a
hole in the flange or duct. Use the template provided in the unit
control box. Use two field-supplied, self-drilling screws to se-
cure the sensor probe in a horizontal orientation. See Fig. 60.
SUPPLY AIR
TEMPERATURE
SENSOR
SUPPLY AIR
Fig. 60 — Typical Mounting Location for Supply
Air Temperature (SAT) Sensor on Small Rooftop
Units
APPLICATION
Differential Dry Bulb Temperature
with PremierLink (PremierLink
requires 4-20 mA Actuator)
Single Enthalpy with PremierLink
(PremierLink requires 4-20mA
Actuator)
Differential Enthalpy with
PremierLink (PremierLink requires
4-20mA Actuator)
NOTES:
CO Sensors (Optional):
2
33ZCSENCO2 — Room sensor (adjustable). Aspirator box is
required for duct mounting of the sensor.
33ZCASPCO2 — Aspirator box used for duct-mounted CO
sensor.
On
1 / -in.
2
ROOF
CURB
RETURN AIR
Table 19 — PremierLink Controller Sensor Usage
OUTDOOR AIR
TEMPERATURE TEMPERATURE
SENSOR
Included —
33ZCT55SPT or
CRTEMPSN001A00
Included — Not Used
Included — Not Used
room
2
NOTE: Refer to PremierLink Controller Installation, Start-up,
and Configuration Instructions for complete PremierLink con-
troller 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 controller is used with
EconoMi$er2 (option or accessory) for outdoor air manage-
ment. The damper position is controlled directly by the Pre-
mierLink controller; EconoMi$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 sensor
2
Outdoor air CO sensor
2
Refer to Table 19 for accessory part numbers.
Field Connections —
sensor and input devices are made at the 16-pole terminal block
(TB3) located beneath the PremierLink controller (See
Fig. 58). Some input devices also require a 24-vac signal
source; connect at CTB terminal R at "THERMOSTAT" con-
nection strip for this signal source. See connections figures on
following pages for field connection locations (and for contin-
ued connections at the PremierLink controller board inputs).
Route wires to control box as indicated in Fig. 37.
Table 20 provides a summary of field connections for units
equipped with Space Sensor. Table 21 provides a summary of
field connections for units equipped with Space Thermostat.
RETURN AIR
OUTDOOR AIR
ENTHALPY SENSOR
SENSOR
Required —
equivalent
Requires —
—
33CSENTHSW
Requires —
— 33CSENTHSW or
equivalent
33ZCT55CO2 — Space temperature and CO
override.
33ZCT56CO2 — Space temperature and CO
override and setpoint.
45
Field connections for accessory
RETURN AIR
ENTHALPY SENSOR
— —
—
Requires —
33CSENTSEN or
equivalent
room sensor with
2
room sensor with
2