R1224 Regulator
Installation Instruction
24-30-01 12-1001
Page: 6-10 Rev. M: 01 Dec. 2021
© 2021 - Hartzell Engine Technologies - All rights reserved
6.11 Regulator Installation Guide-H
A. General
Use 2 R1224B as the mounting holes match the Lamar regulators. Both regulators must be replaced.
(1) Ensure that the R1224B internal jumpers are set properly for the aircraft voltage (Fig 6-1).
(2) Mark the wires on the Lamar regulators and disconnect them. Wire Identification is important for
reconnection.
(3) Remove the old regulators. If the aircraft as equipped with Lamar Over voltage Relays you can remove
them if you desire. (The R1224B has internal over voltage control so the Lamar units are not needed).
(4) Install R1224B regulators in the location from which the Lamar regulators were removed.
(5) If the ring lugs on the wires are too large, cut them off and crimp on the provided lugs.
(6) Connect each G wire to #1 (Ground) of the corresponding R1224B.
(7) Connect each F wire to #2 (Field) of the corresponding R1224B.
(8) Connect each S or B wire to #3 (Enable) of the corresponding R1224B.
(9) Ensure that there is a jumper between #3 (Enable) and #4 (Aux) of each R1224B. For R1224B Rev C
and later: Ensure there is a jumper between #3 (Enable) and #8 (Sense) of each R1224B.
(10) Connect the paralleling wire of the right alternator regulator to #6 (IN), there by designating this regulator
as the SLAVE for load-sharing operation.
(11) Connect the paralleling wire of the left alternator regulator to #7 (OUT), thereby designating this regulator
as the MASTER for load-sharing operation.
Voltage Adjustment:
Remove the regulator covers. With the engines running, enable only the left (MASTER) alternator and regu-
lator. Make sure that the right regulator & alternator are disabled. Adjust the MASTER R1224B for the desired
voltage.
Disable the left (MASTER) alternator and regulator and enable the right (SLAVE) R1224B. Make sure that the
left regulator & alternator are isabled. Adjust the SLAVE R1224B for the desired voltage.
Replace the regulator covers.
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