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General Wiring
Instructions & Diagrams
Make all connections according to wiring diagrams and in compliance with national and local codes. Make all con-
nections with power removed. Failure to do so may result in circuit board damage. Shielded cable is recommended
for input and analog setpoint wiring. The shield should be connected to the UCM-420A "common" terminal. At the
opposite end, the shield is not to be connected, and should be taped back. In cases where more wires are required
to be connected to the common terminal block of the UCM-420A than will fit under the screw on the terminal block,
connect as follows:
A. Place the 24 VDC minus power wire directly under the "common" screw.
B. Place one or two short splice wires directly under the "common" screw and tighten screw.
C. Make all required "common" connections to the splice wires using crimp connections or
wire nuts.
Make all wiring connections for local and/or remote setpoint, input, power, and outputs per the General Wiring
Diagrams which follow.
REMOTE SETPOINT WIRING - PULSE-WIDTH SETPOINT (DIAGRAMS 1, 2 & 3)
The PWM Remote Setpoint Signal may be powered by the UCM-420A power supply or by a separate power
source. If a separate power source is used, the PWM signal may be 24 VAC or 24 VDC. There is no polarity on the
PWM terminals. Either leg of the PWM signal may be switched by the controller.
(See General Wiring Diagrams 1, 2 & 3.)
GENERAL WIRING DIAGRAM 1 - Using the UCM-420A power supply for PWM pulse and switching
positive leg of the PWM pulse circuit.
JUMPER
POSITION
NUMBER
GENERAL WIRING DIAGRAM 2 - Using the UCM-420A power supply for PWM pulse and switching
negative leg of the PWM pulse circuit.
JUMPER
POSITION
NUMBER
JUMPER
PINS
PWM
INPUT
1
PWM
2
INPUT
REM SPT
3
INPUT
4
LOC SPT
POT +
5
LOC SPT
6
INPUT
LOC SPT
7
POT –
8
FEEDBK
INPUT
9
24V PWR
10
COMMON
11
MA SIG
12
OUTPUT
JUMPER
PINS
PWM
1
INPUT
PWM
2
INPUT
3
REM SPT
INPUT
4
LOC SPT
5
POT +
6
LOC SPT
INPUT
LOC SPT
7
POT –
8
FEEDBK
9
INPUT
24V PWR
10
COMMON
11
12
MA SIG
OUTPUT
CONTACT AT BAS CONTROLLER
CONTACT AT BAS CONTROLLER
4
24 VAC
+
OR
–
24 VDC
24 VAC
+
OR
–
24 VDC
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