The Warren Technology HD1-028D-A30PM2E is a single pole DC relay used in compatible HVAC electric heat and control applications. It is commonly paired with Warren CRR9 series time delay rectifiers, including CRR9-5, CRR9-9, and CRR9-18, to support proper relay operation and control sequencing.
This relay is used in electric heat kits, air handlers, fan control circuits, and other HVAC control applications where a compatible DC coil relay is required. Warren’s official replacement reference lists the alternate relay as T9AP1D52-24, described as a single pole, 30 amp resistive, normally open contact relay with a 24VDC coil.
Features
• Warren Technology HD1-028D-A30PM2E relay
• Single pole relay design
• 30 amp resistive contact rating
• Normally open contact
• DC coil relay for HVAC control applications
• Commonly used with CRR9-5, CRR9-9, and CRR9-18 time delay rectifiers
• Used in compatible electric heat, air handler, relay, and fan control circuits
• Warren alternate/replacement reference: T9AP1D52-24
Important Note
Always verify the relay part number, coil voltage, contact rating, and wiring requirements before replacement. This relay is commonly paired with a CRR9 time delay rectifier, but the correct delay timing depends on the equipment application.
