and 48TCED series units

ensuring the auxiliary heat is correctly engaged while the outdoor unit clears its coils

If the main valve fails to close tightly or exhibits erratic pressure regulation

resulting in improper airflow regulation and compromised static pressure

it comes equipped with both upstream and 1/8" NPT downstream pressure tappings to facilitate proper manifold pressure testing and adjustment

Armstrong Fluid Technology AS1270-380 O-Ring 328140-751 and 48TCED series unitsThe Armstrong Fluid Technology AS1270 380 O Ring is a precision engineered EPDM rubber seal designed specifically for 10 inch pump side connection suction guides. Featuring a 11. 475" ID x 0. 210" CS configuration, this EPDM cover O ring ensures a high integrity, leak proof seal within demanding HVAC pumping systems. Engineered for dimensional stability, this Armstrong pump replacement part maintains its physical properties across varying temperature