Repair
Repair Price: $ 1,108.00
Purchase
CSL Part Number: 70778
Product Overview: The Life-Gard Model 85A is a microprocessor-based transformer temperature controller that monitors and protects power transformers from thermal overload. It continuously measures winding temperatures across three phases using RTD sensors, automatically activating cooling fans at preset thresholds and triggering alarms if temperatures exceed safe limits. Commonly installed in electrical substations, industrial facilities, and commercial buildings with large transformers, it features digital LED temperature displays, configurable trip points via DIP switches, and dual relay outputs for fan control and alarm signaling. The H-150 variant is a specific configuration within the 85A series with predetermined temperature setpoints for fan activation and alarm conditions.
Category: Temperature Control
Manufacturer: Square D
Alternate Manufacturer Names: Life-Guard, lifegard, Schneider Electric
Manufacturer Part Number: 85A / H150
Series: Model 85A Transformer Fan Control
Brand: Life-Gard
Other Synonyms: Life-Guard, lifegard, Schneider Electric
Why replace your Life-Gard Fan Control System? Repair it for less!
Common Failures
Our repair history indicates several recurring issues with this product, primarily involving electronic components such as capacitors, relays, and transformers. Common symptoms include non-functional buttons, erratic display behavior, inability to switch phases, and false alarms. In some cases, physical damage, such as cracked standoffs and corroded button contacts, has also been reported.
Repair Approach
Repairs generally involve replacing defective components such as capacitors, transformers, and relays. Circuit board traces are occasionally repaired when damaged. In some instances, repositioning or replacing structural components, like standoffs, may be performed. Calibration is verified where applicable to confirm correct operation post-repair.
Testing & Quality
Repaired units undergo testing procedures, including burn-in tests and functionality verifications, to confirm that repairs address the reported issues and that units meet expected performance standards. Any units requiring additional attention are subject to further diagnostics and repair work as needed.
Service and repair your broken Square D part
We can repair your Square D model 85A / H150 in our facility. Let our skilled technicians get your Square D back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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