What are the winding temp sensor ratings?
RTHA/RTHB / CHHA Compressor
Refer to RTHA-SB-5A page 26 and RTHB-SB-5. See the details below.
Motor Winding Temperature Sensors (1TB4-15 thru -18)
The leads of the 3 temperature sensors (4B1R2, 4B1R3, 4B1R4) buried in the compressor motor windings are connected to these input terminals. Check the unit wiring diagram to properly identify individual sensor wires.
Note: Notice that the "common" leg of each sensor is connected to terminal 1TB4-17.
Specifications for the motor winding temperature sensor inputs are as follows:
- Operating Range: 50 F to 310 +/- 5 F
- Open: Diagnostic b A4, b A7 or b A8, as applicable
- Shorted: No diagnostic
- Winding Temp ≥ 165 F: 5 min Start Delay (operating code A70)
- Winding Temp ≤ 165 F: 2 min Start Delay (operating code A70)
- Trip Point Temp: = 265 +/- 5 F
Additional details
Other Question/Problem/Cause Statements
- What are the winding temp sensor ratings?
- What are the terminations for the motor temperature sensors?
- CHHA motor temperature sensors
Facts
- Water-Cooled Chiller (Pueblo) (RTHA)
- Water-Cooled Chiller (Pueblo) (RTHB)
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.