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HVAC
NATE Hydronics Gas Service Specialty
Zone Valve Troubleshooting
Knowledge Check
Zone Valve Troubleshooting
Knowledge Check
Knowledge Check
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What is the primary difference between a 4-wire zone valve and a 3-wire zone valve?
A
4-wire valves can handle higher water temperatures
B
4-wire valves have an additional wire for the end switch to control a dedicated circulator per zone
C
4-wire valves use 120V AC; 3-wire valves use 24V AC
D
4-wire valves are motorized; 3-wire valves are manual
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