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The Schneider Electric MK4-3121 is a commercial-grade pneumatic damper actuator engineered for precise proportional control in complex HVACR systems
Its compact oval dual capacitor form factor allows for seamless integration into tight electrical service panels found in Lennox
as it can lead to unsafe combustion conditions or frequent nuisance lockouts
the protective coating on OEM flame sensors eventually wears thin
unlike standard solenoid-timed drains
Peco Controls TW180 Thermostat 321142-301 The Schneider Electric MK4-3121 isThe Peco Controls TW180 Thermostat is a high performance multi fan fan coil thermostat engineered for precise temperature management in PTAC and fan coil applications. Built for professionals, this controller handles line voltage and low voltage systems ranging from 24 VAC up to 277 VAC. Whether you are servicing 2 pipe or 4 pipe fan coil configurations, the TW180 provides the versatility needed for commercial retrofits and new installations in
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