C.E. Niehoff & Co. A2-325/A2-330/A2-336 Regulator Installation - Manual

II70E Page 1 of 1
A2-325, A2-330 & A2-336
Regulators
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
Table 1 – Voltage Setpoint Switch Position
Voltage Setpoints (Fig. 1)
Position 1 27.5 V
Position 2 28.0 V
Position 3 28.5 V
Position 4 29.0 V
Battery Type
Maintenance
Maintenance
Maintenance-Free
Maintenance-Free
Note: On Group 31 batteries, if boiling or excessive gassing occurs with high voltage
setpoint (position 3), change to medium voltage setpoint (position 2).
Figure 1 – Voltage Setpoints
Installation Instructions
1
2 3
4
1. Before installing, turn regulator over and
select appropriate voltage setpoint for battery
type (See Table 1 and Fig. 1).
2. Install new regulator as described below:
a. Mount new regulator on alternator in the
same position as the previous regulator.
b. Use regulator mounting screws supplied.
Torque screws to 8.5 Nm/75 lb. in.
3. Plug the alternator-to-regulator harness into
the regulator and twist connector to make sure
it is securely tightened.
4. Regulator connections:
• Connect IGN terminal to ignition source
through existing switch. Torque M5 termi-
nal nut on regulator to 4.5 Nm/40 lb. in.
• D+ terminal can provide 28 VDC sense
voltage
to multiplex controller. When
required, connect D+ terminal to control-
ler through a relay. The relay coil must
be diode-protected and rated for proper
voltage. Torque M6 terminal nut on
regulator to 4.5 Nm/40 lb. in.
• P terminal taps AC voltage, typically half
the charge voltage. When required, connect
P terminal to tachometer or relay. Torque
M6 terminal nut on regulator to 4.5 Nm/
40 lb. in.