When troubleshooting water heater error codes such as the 101 or 991

a field-adjustable pressure switch should be sourced

The leads are color-coded to align with standard Daikin-McQuay control schematics

it effectively monitors positive

Itron-Actaris B42R-3/4 Regulator 320074-702 When troubleshooting water heater errorThe Itron Actaris B42R 3 4 Regulator is a spring loaded, self operated gas pressure regulator engineered for precision in residential and light commercial HVAC system applications. Featuring a 3 4" NPT connection and an internal relief (IRV) valve, this model ensures high capacity relief performance without the need for additional overpressure protection. The 6: 1 lever ratio and 12. 6 sq. in. molded deep convolution diaphragm provide a consistent