Johnson Controls A19AAC-59 Utility Thermostat 30067439-890 secured via a set screw

secured via a set screw for a 1/2" keyed or flat-surface motor shaft

System Protection: Helps prevent common failure modes such as compressor flooding and evaporator starving by maintaining balanced pressure

As a high-volume relay output model

and MP953E series actuators that require a 5-inch base frame

How do I verify if the 15D57 is compatible with my heat pump

Johnson Controls A19AAC-59 Utility Thermostat 30067439-890 secured via a set screwJohnson Controls A19AAC 59 Utility Thermostat, 120 208 240 Vac, 65 300 Degree Temperature Range, 6' Capillary, Open on Rise, Bulb Style 1, Screw Driver Range Adjuster A19AAC 59 is the direct replacement for A19AAC 61 (SLIGHTLY SHORTER BULB)