ICP 2-Pole 30A 24V Contactor for RGS121LDAA0AAAA — OEM 1178074 | Ships Today

Overview

This OEM 2-pole, 30-amp contactor with a 24-volt coil (factory part 1178074) is the switching relay for the ICP/Tempstar/Heil RGS121LDAA0AAAA system. When the thermostat calls, the 24V control signal energizes the coil, pulling the contacts closed to send line voltage to the compressor and condenser fan motor. Contactors are a high-wear item: the contacts arc every cycle and eventually pit, burn, or weld. Symptoms of failure include a system that won't start, a humming or chattering contactor, or a unit that runs continuously because the contacts welded shut. Replacing a worn contactor restores reliable, safe switching and protects the compressor from low-voltage and chatter damage.

Specifications

Compatibility

Direct-fit replacement for the ICP/Tempstar/Heil/Comfortmaker RGS121LDAA0AAAA and other units calling for a 2-pole 30A 24V definite-purpose contactor. Verify pole count, amp rating, and coil voltage against your existing contactor before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
2. Access — Remove the unit's electrical access/service panel.
3. Document — Photograph every wire and terminal position before disconnecting.
4. Remove — Transfer wires one at a time (or label them), then unbolt the old contactor from the bracket.
5. Install — Mount the new contactor, reconnect line, load, and 24V coil wires exactly per your photo.
6. Test — Restore power and confirm the contactor pulls in on a call and the compressor and fan energize normally.

Signs You Need a Replacement

• System won't start or starts intermittently.
• Loud humming, buzzing, or chattering from the contactor.
• Pitted, burned, or welded contacts.
• Unit runs nonstop because contacts won't release.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.