Carrier 30GTR Specifications download pdf (Page 11)

OPERATING DATA

Sensors —

The electronic control uses 4 to 10 ther-

mistors to sense temperatures for controlling chiller opera-

tion. See Table 2. These sensors are outlined below. See

Fig.7-10forthermistor locations. Thermistors T1-T9 are

5kVat 25 C (77 F) and are identical in temperature versus

resistance and voltage drop performance. Thermistor T10 is

a10kVat 25 C (77 F) and has a different temperature vs

resistance and voltage drop performance. See Thermistors

section on page 55 for temperature-resistance-voltage drop

characteristics.

T1 — COOLER LEAVING FLUID SENSOR — This ther-

mistor is located in the leaving ﬂuid nozzle. The thermistor

probe is inserted into a friction-ﬁt well. The sensor well is

located directly in the refrigerant path.

T2 — COOLER ENTERING FLUID SENSOR — This ther-

mistor is located in the cooler shell in the ﬁrst baffle space

in close proximity to the cooler tube bundle.

T3, T4 — SATURATED CONDENSING TEMPERATURE

SENSORS — These 2 thermistors are clamped to the out-

side of a return bend of the condenser coils.

T5, T6 — COOLER SUCTION TEMPERATURE SEN-

SORS — These thermistors are located next to the refrig-

erant inlet in the cooler head, and are inserted into a friction-

ﬁt well. The sensor well is located directly in the refrigerant

path. These thermistors are not used on units with TXVs.

T7, T8 — COMPRESSOR SUCTION GAS TEMPERA-

TURE SENSORS — These thermistors are located in the

lead compressor in each circuit in a suction passage after the

refrigerant has passed over the motor and is about to enter

the cylinders. These thermistors are inserted into friction-ﬁt

wells. The sensor wells are located directly in the refrigerant

path. These thermistors are not used on units with TXVs.

T9 — OUTDOOR-AIR TEMPERATURE SENSOR — Sen-

sor T9 is an accessory sensor that is remotely mounted and

used for outdoor-air temperature reset.

LEGEND

EXV — Electronic Expansion Valve

*And associated modular units.

Fig. 7 — Cooler Thermistor Locations

040-110*

130-210*

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 83 84

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Carrier 30GTR Specifications Page 11

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