the 622171 is the official 622171R replacement motor and shares identical technical specifications

also identified as the XB1019MW551B

Precision Pilot Operation: Minimum pressure differential required for shifting is minimized to ensure reliable cycle changeover in low ambient conditions

If the original 621773R motor has seized or is showing high amperage

the VAL8562 valve supports either mixing or diverting configurations to maintain stable water temperatures and system pressures

Johnson Controls T-3111-6 Pneumatic Thermostat Els PW 29614 the 622171 is the officialThe Johnson Controls T 3111 6 Pneumatic Thermostat is a heavy duty, direct acting controller engineered for proportional management of steam or water valves in terminal air conditioning units. As a veteran preferred valve top mounting thermostat, this unit integrates a high sensitivity averaging bulb element (8 foot sensing area) to ensure precise environmental regulation by mitigating the effects of air stratification. Designed for "single