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The 129179 is typically supplied as a non-expansion (fixed) unit
With an adjustable differential from 3
What does the high-limit function do
It can also be caused by a blocked flue or insufficient combustion air in gas-fired units
Heatcraft Refrigeration 30101801 Thermostat R-134A The 129179 is typically suppliedThe Heatcraft Refrigeration 30101801 Thermostat, also identified as a defrost termination switch, is a critical OEM replacement part for commercial walk in coolers and freezers. Engineered to provide accurate temperature control, this component acts as a high limit safety, automatically disconnecting power to heating elements if internal temperatures exceed safety thresholds. This ensures the protection of the evaporator coil and prevents thermal
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