Problem:
Compressor contactor will not pull in with 24 vac present at R, Y and SI on the LSD.
Fault LED Indicator on the Lockout Safety Device is not Flashing or Steady On.
Summary:
This device monitors the compressor safety circuit trips to protect and prevent short cycling of the compressor. When the safety circuit has had four trips in a row, the LSD1 controller will lockout the compressor operation and require a manual reset.
LSD1
Location of the LSD1 Device
Troubleshooting Test
Jumping R to DTL safety circuit at the unit (bypassing field wiring) brings the compressor on. Tech Support found that high resistance in the field wiring between the unit andnthe thermostat can lead to this issue.
Current Factory LSD Wiring
Recommended Field Wiring correction to the LDS Safety Circuit
- Locate the DTL switch and disconnect the spade terminals on the 140B/E (BLK) wire connected to the DTL (BLK) wire.
Now locate the LTB board and add a wire from the LTB -1 R terminal and run it down to the DTL sensor where 140 B (BLK) was disconnected.
3. Cap of the 140B/E (BLK) wire with a wire nut.
4. Connect the new added wire from LTB-1 R to the DTL (BLK) wire where 140B/E (BLK) wire was removed and capped.
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.