Air Pressure Switch Circuit: Residential Power-Vent & Power-Direct-Vent Water Heaters; Air Pressure Switch Circuit: Cyclone Water Heater - A.O. Smith INTELLI-VENT Troubleshooting Manual

Residential Power-Vent & Power-Direct-Vent Water Heaters
1
Molex Plug
6 Pin Plug
4
Normally Closed Contacts
Open on a Fall in Pressure
4
CN6 Plug
Control Board
6
AHSA02307
Air Pressure Switch Circuit
Blocked Exhaust Switch
Normally Open Contacts
Close on a Fall in Pressure
Air Pressure Switch Circuit
Cyclone Water Heater
Blocked Inlet Switch
Blower Prover Switch
Normally Open Contacts
Close on a Rise in Pressure
8 of 8
Vent Temperature Limit Switch
Normally Closed Contacts
Open on a Rise in Temperature
Blocked Exhaust Switch
Normally Closed Contacts
Open on a Rise in Pressure
Low Gas Pressure Switch
Normally Open Contacts
Close on a Rise in Pressure
(BTH 120, 250, 300, 400 only)