Carrier HS070-160 manual Thermistor Compressor and Cooler

Thermistors - All thermistors are identical in their temperature vs resistance performance. Resistance at various temperatures are listed in Table 8.

LOCATION -- General location of thermistor sensors are shown in Fig. 9.

Cooler Leaving Water Sensor, TL, is located in the leav- ing water nozzle. The probe is immersed directly in the water. All thermistor connections are made through a 1,/4-in. coupling (Fig. I I). Actual location is shown in Fig. 4.

Cooler Entering Water Sensor, T2, is located in the cooler shell in first baffle space, near to tube bundle. Actual

location is shown in Fig. 4.

Cooler Saturated Suction Temperature Sensors, T5 and T6, are located next to refrigerant inlet in cooler head. Thermistors are immersed directly into refrigerant. Typical location is shown in Fig. 4.

Compressor Suction Gas Temperature Sensors, T7 and T8, are located in lead compressor in each circuit in a suction passage between motor and cylinders, above oil pump.

SENSOR REPLACEMENT - TI, T2, T5, T6, T7, T8 (Compressor and Cooler)

Sensors are installed directly in refrigerant or water circuit. Relieve all refrigerant pressure or drain water before removing.

Proceed as follows (refer to Fig. I I):

I. Remove and discard original sensor and coupling.

I	IMPORTANT: Do not disassemble new couphng;
	install as received.	I

2. Apply pipe sealant to I /4-in. NPT threads on replace-

ment coupling and install in place of original. Do not use packing nut to tighten coupling; this would damage ferrules (see Fig. I I ).

3.Insert new sensor in coupling body to its full depth. Hand tighten packing nut to position ferrules, then finish tightening I-1/4 turns with a suitable tool. Ferrules are now attached to sensor, which can be withdrawn from coupling for unit servicing.

FERRULESCOUPLING

INSIDE\/ASSEMBLY

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. II

CABLE ASSEMBLY FERRULES SENSOR

2$70mm)‘f

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C O U P L I N G B O D Y

Fig. 11 - Thermistor (Compressor and Cooler)

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