Manuals, Submittal Sheets, and Technical Bulletins
EC (Enthalpy Control)
EWT-3102 / EWT-3103
MA-LF24 / MA-LF120
MA-ND3, MA-ND3B, MA-ND4, or MA-ND5 please see "MRK"
MA-SR24 / MA-SR120 (obsolete - replaced by MA-SRE)
MA-SRE24 / MA-SRE120
MRK (Motor Replacement Kit)
The current "MRK" kit includes an MA-ND5 motor. It uses three
wires to power open or to power close. The EWC Controls motor
actuators have seen many design changes over the years. Models
MA-ND3 (blue case) and MA-ND3B (orange case) are obsolete.
Models MA-ND4 and MA-ND5 (grey cases with clear covers) are current.
All of these models have identical wiring and installation instructions.
Please refer to the documentation for the MA-ND5 for any of these
models. The current "MRK" kit will replace any MA-ND3, MA-ND3B,
MA-ND4, or MA-RDN.
ST-2 & ST-3