York International 025-27911-000 HVAC Transformer

The York 025-27911-000 HVAC Transformer is a 75 VA, panel-mounted control transformer that steps 115 V AC line power down to a low-voltage supply for HVAC control circuits in York air conditioners, chillers, and furnaces. Manufactured by York (Johnson Controls), it provides a secondary voltage of approximately 19.8–24 V AC (model dependent) at 50/60 Hz to power relays, control boards, thermostats, ignition systems, contactors, and safety controls inside the unit’s control cabinet. Its primary function is to deliver stable low-voltage power for HVAC control components, supporting reliable operation of heating and cooling equipment. Maintenance teams, OEMs, and system integrators use this part for transformer replacement, control circuit repair, and HVAC system maintenance applications. Typical installations place the transformer inside the equipment’s control panel, where it serves as the power source for control circuits, boards, and relays. Common replacements include York 025G00009-014 Transformer and York TRN-4904-6 Control Transformer, as well as universal 75 VA 115 V–24 V HVAC control transformers.