Issue:
On occasion, an installing contractor or startup technician will report that a horizontally mounted circulating pump is pulling FLA at unit start-up.
Resolution:
The majority of the time, you can use a dead blow hammer on the pump to get it un-stuck. The TCS support team has consulted Armstrong on the issue and we suspect one of two things maybe happening:
- The pump assembly is jarred during shipping, causing a slight un-alignment of the pump/motor assembly.
- The TEFC motor weep hole should be opened half way, if not moisture can build up inside and the motor may be temporarily seized.
We have found that after the motor/pump is un-stuck, the pump will operate trouble free for the life of the equipment. Motor bearings are lubricated by grease, and Armstrong recommends that horizontally mounted motors are rotated every two to three months to return the lubricant to the upper half of the bearing and prevent ball damage. Do not leave shaft in same position as when you started.
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.