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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
With an operational temperature range of -40°C to 85°C
Common Questions: How do I confirm if the 4021153 is the correct board for my unit
always verify your control voltage at the terminal strip before installation
Thermal Stability: Engineered to maintain elasticity under high-pressure steam conditions without hardening
Direct Integration: Standardized mounting patterns and single-speed operation facilitate faster service calls
Markel 28163005 Relay 320788-704 With an operational temperature rangeThe Markel 28163005 Relay is a heavy duty high power HVAC time delay relay designed for precise sequencing in residential and industrial heating systems. Rated for up to 2. 3kW (2300W) at 240V, this SPST sequencer relay is a critical component for managing lead lag operations, fan delays, and multi stage heating cycles. It is specifically engineered for full compatibility with Markel, TPI Corporation, and Raywall equipment, including high demand