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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
the Armstrong International 881 features a small vent hole in the bucket that provides continuous automatic air and CO2 venting at steam temperature
utilizing the correct Maxitrol regulator spring is essential to prevent pressure drops and ensure stable outlet delivery under varying load conditions
as resulting turbulence can lead to premature diaphragm failure
the thermostatic element in the air vent may be fatigued or failed
This specific model is the correct automatic drain valve for units produced with date codes before 9923
Siemens Building Technology QPM2100 Sensor Els PW 29614 the Armstrong International 881 featuresThe Siemens Building Technology QPM2100 Sensor is a high precision duct air quality sensor engineered for demand controlled ventilation in commercial HVAC systems. Utilizing non dispersive infrared (NDIR) technology, this maintenance free CO2 transmitter provides reliable 0 2000 PPM CO2 monitoring without the need for periodic recalibration. It serves as the direct replacement for the legacy 90DM3ADT 1, offering seamless integration into existing BAS
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