extending the operational life of the primary control board

water accumulation in the collector box

Does this unit include an automatic drain

making it a reliable choice for commercial and heavy-duty residential furnaces

while the 525 psig maximum overpressure rating prevents bellows failure during system spikes

Maxitrol TD121B Temperature Selector R-410A extending the operational life ofThe Maxitrol TD121B Temperature Selector is a critical component for Selectra Series 21 and 31 electronic gas flame modulation systems. Specifically engineered for indirect fired make up air units, this remote selector provides precise setpoint control within a 120 170F temperature range. For a stable discharge air temperature, it must be paired with a TS121B sensor to ensure the resistance curves match the A1010 or A1011 amplifier logic. This