Pressure Transducer Identification; Thermistors And Wells; Space Temperature Sensor Wiring; Cooler Leaving Fluid Sensor - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

Table 12 — Pressure Transducer Identification
CARRIER
TRANSDUCER
PART NUMBER
Discharge HK05ZZ001
Suction HK05SZ003
The electronic control uses 2 to 8 thermistors to
Sensors —
sense temperatures for controlling chiller operation. See
Table 7. These sensors are outlined below. Thermistors cooler
leaving fluid, cooler entering fluid, discharge temperature, cir-
cuit A return gas temperature, outdoor-air temperature sensor
or dual LWT sensor, accessory remote space temperature sen-
sor, condenser entering fluid temperature sensor, and condens-
er leaving fluid temperature sensor are identical in temperature
versus resistance and voltage drop performance. All thermis-
tors are 5,000 ohmsat 77 F (25 C) except the space tempera-
ture thermistor which is 10,000 ohms. Space temperature
thermistor (SPT) is 10,000 ohms at 77 F (25 C). See
Thermistors section on page 46 for temperature-resistance-
voltage drop characteristics.
COOLER LEAVING FLUID SENSOR (LWT) — The therm-
istor is installed in a well in the factory-installed leaving fluid
piping connecting to the bottom of the brazed-plate heat
exchanger.
COOLER ENTERING FLUID SENSOR (EWT) — The therm-
istor is installed in a well in the factory-installed entering fluid
piping connecting to the top of the brazed-plate heat exchanger.
CONDENSER LEAVING FLUID SENSOR (CDLT)
(30MPW Only) — The thermistor is installed in a well in the
field-installed leaving fluid piping connecting to the bottom of
the brazed-plate heat exchanger. The thermistor and well are a
field-installed accessory. The thermistor and well are a field-
installed accessory. See Table 13 for thermistor and well part
numbers. This sensor must be enabled, Configura-
 
tion OPT1 CDWS= ENBL.
CONDENSER ENTERING FLUID SENSOR (CDET)
(30MPW Only) — The thermistor is installed in a well in the
field-installed entering fluid piping connecting to the top of the
brazed-plate heat exchanger. See Table 13 for thermistor and
well part numbers.
Table 13 — Thermistors and Wells
THERMISTOR
DESCRIPTION
PART NO.
3 in., 5,000 ohm
HH79NZ014
Thermistor
4 in., 5,000 ohm
HH79NZ029
Thermistor
1-1/2 in.,5,000 ohm
00PPG0000B105A
Thermistor
COMPRESSOR RETURN GAS TEMPERATURE SEN-
SOR (RGT.A) — This accessory thermistor can be installed
in a well located in the suction line. Use Carrier part number
HH79NZ029. This thermistor is standard for unit sizes 050-
071. For 015-045 this accessory must be enabled, Configura-
 
tion OPT1 RG.EN = ENBL.
OUTDOOR-AIR TEMPERATURE SENSOR (OAT) —
This sensor is an accessory that is remotely mounted and used
for outdoor air temperature reset. See Table 7. Use Carrier part
number HH79NZ023. If sensor is attached, it must be enabled,
 
(Configuration OPT1 OAT.E=ENBL) and include broad-
cast information.
Outside Air Temperature can be forced to a value at the
scrolling marquee or Navigator device. To force the value, ac-
cess the parameter Temperatures
to view the current value. Press
ENTER
use the up and down arrow keys to display the desired value;
PRESSURE
BODY
RANGE,
COLOR
psi (kPa)
14.5 to 667
Red
(100 to 4599)
–6.7 to 420
Yellow
(–46 to 2896)
WELL PART NO.
10HB50106801
10HB50106802
00PPG00000B000A
 
UNIT OAT. Press
again and
ENTER
then press to accept the value. On the scrolling mar-
ENTER
quee, the "." in the lower right corner will flash. On the Navi-
gator device, a flashing "f" will be displayed next to the value.
To clear the forced value, press
and down arrow keys simultaneously. The value will revert to
the actual reading and the flashing "." or "f" will be removed.

DUAL LEAVING WATER TEMPERATURE SENSOR

(DLWT) — This input can be connected to the LVT. See Ta-
ble 7. For dual chiller applications (parallel only are support-
ed), connect the dual chiller leaving fluid temperature sensor
(see Table 13 for thermistor and well part numbers) to the out-
side air temperature input of the Master chiller. If outside-air
temperature is required for reset applications, connect the sen-
sor to the Slave chiller and configure the slave chiller to broad-
cast the value to the Master chiller. The broadcast must be en-
abled, (Configuration
only two units, the master chiller must be configured to ac-
knowledge the broadcast (Configuration
=ON). If there are more than two units, at least one unit must
be configured to acknowledge the broadcast (Configura-
 
tion BCST BC.AK =ON).
DISCHARGE TEMPERATURE
(DTT) — This sensor is only used on units with a digital
compressor. The sensor is mounted on the discharge line close
to the discharge of the digital compressor. It attaches to the dis-
charge line using a spring clip and protects the system from
high discharge gas temperature when the digital compressor is
used. This sensor is a connected to the AUX board.
SPACE TEMPERATURE SENSOR — Space
sensors are used to measure the interior temperature of a
building.
Space Temperature can be forced to a value at the scrolling
marquee or Navigator device. To force the value, access the
parameter Temperatures
view the current value. Press
and down arrow keys to display the desired value; then press
to accept the value. On the scrolling marquee, the "."
ENTER
in the lower right corner will flash. On the Navigator device, a
flashing "f" will be displayed next to the value. To clear the
forced value, press
ENTER
row keys simultaneously. The value will revert to the actual
reading and the flashing "." or "f" will be removed.
The following type of SPT sensor is available:
• Space temperature sensor (33ZCT55SPT) with timed
override button (see Fig. 9)
TIMED OVERRIDE
BUTTON (SW1)
Fig. 9 — Space Temperature Sensor
Typical Wiring (33ZCT55SPT)
15
followed by the up
ENTER
 
BCST OAT.B=ON). If there are

BCST
THERMISTOR
temperature
 
UNIT SPT. Press
ENTER
ENTER again and use the up
followed by the up and down ar-
1 2 6
3 4 5 RED(+)
WHT(GND)
CCN COM
BLK(-)
SEN
SW1
BRN (GND)
SENSOR WIRING
BLU (SPT)

BC.AK
to