The MacDuffco 24 VAC Relay, the MDR 2400
is an electronic relay used to control any 120 volt
system. The MDR 2400 in conjunction with the 4 Zone
Valve Controller can intelligently activate circulating
pumps or mixing valves when any thermostat circuit is
calling for heat. This saves both wear and tear and
energy as the circulating pumps only operate when heat
is required. The 24 VAC connects directly into either
a 4" octagon or 4" square electrical box with
1/2" knockouts.
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