Sid Harvey (T-34-B)

It is fully compatible with modern refrigerants

allowing for integral fusing without extra kits

The JD-2 differential switch is engineered for a compression fit installation

Carrier HH18HA147 Limit Switch 319852-301 Sid Harvey (T-34-B)The Carrier HH18HA147 Limit Switch is a critical safety component designed for precise thermal monitoring within furnace heat exchangers and air handlers. Engineered as a high limit protection device, this switch is a direct replacement for HH18HA147A and functions by opening the electrical circuit if internal plenum temperatures exceed safe operating parameters. This prevents thermal stress on the heat exchanger and ensures the system operates within