The Nordyne 151888R Orifice is a high-precision HVAC replacement part designed specifically for gas furnace inducer assembly applications

If the furnace blower runs continuously while the burners remain off

It is specifically designed to work with the Honeywell S8610U and related intermittent pilot controls

The valve is compatible with chilled or hot water

The inclusion of durable sleeve bearings and an automatic thermal protector allows for continuous duty in high-ambient conditions

Lochinvar & A.O. Smith 100109151 Switch 319852-301 The Nordyne 151888R Orifice isThe Lochinvar & A. O. Smith 100109151 is a critical safety component designed for high efficiency BTH (Best Tankless Hybrid) water heaters and commercial boilers. This Low Gas Pressure Switch is factory calibrated to a 5" WC (Water Column) set point, serving as a primary sentry to ensure safe combustion cycles. In the field, this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions,