Ab c d, Wiring to 4-20 ma modulating motors, Wiring to voltage modulating motors – Lochinvar Harmony User Manual
Page 9: Wiring the stage outputs, 20 ma modulation outputs, Voltage
9
Wiring the Stage Outputs
• Each Stage output (A through D) has one Normally Open (N.O.)
relay contact.
• The N.O. contacts are dry contacts only. They do not source any
voltage.
• Each N.O. contact is capable of switching 6A resistive at 120VAC.
• Total output of all stages, including the SYS, must not exceed 15A.
• Wire the N.O. relay contacts in series with the boiler’s limit circuit.
• Class 1 voltages must enter the enclosure through a different
opening from any Class 2 voltage wiring.
WIRING TO 4-20 MA MODULATING MOTORS
• The Harmony can be equipped to operate up to four 4-20 mA
modulating motors.
• To program the control for 4-20 mA output, see System Startup
settings, pg. 12.
• Apply the supplied label marked 4-20 mA below the output termi-
nals.
• The output boards are connected on the rear of the panel.
• The pair of outputs A and B are controlled by a one output board.
The pair of outputs C and D are controlled by a second output
board.
• The Harmony sources 24VDC excitation voltage for the 4-20mA
signal.
• Wire as shown below:
mA Source (+)
Common
Stage A
Stage B
Stage C
Stage D
C1
C4
C7
C10
C2
C5
C8
C11
Harmony
Sources
Current
WIRING TO VOLTAGE MODULATING MOTORS
• The Harmony can be equipped to operate up to four 0-5 V, 0-10V, 1-
5V, or 2-10V modulating motors.
• Apply the supplied label marked Voltage below the output terminals.
• The output boards are connected on the rear of the panel.
• To select the range, 0-5V, 0-10V, 1-5V or 1-10V, see pg. 12.
• The pair of outputs A and B are controlled by a one output board.
The pair of outputs C and D are controlled by another output board.
• Wire as shown below:
V+
GND
Stage A
Stage B
Stage C
Stage D
C1
C4
C7
C10
C3
C6
C9
C12
INSTINSTINSTINSTINST
ALLAALLAALLAALLAALLA
TIONTIONTIONTIONTION
OUTPUT WIRINGOUTPUT WIRINGOUTPUT WIRINGOUTPUT WIRINGOUTPUT WIRING
10
9
8
7
6
5
4
3
11
12
SYS
A
B
C
D
OPERATING LIMIT
OUTPUTS
C
Limit Circuit
Typical for each stage
4-20 mA
MODULATION OUTPUTS
A
mA
B
C
D
C1
C2
C3
C4
C5
C6
C7
C8
C9 C10 C11 C12
4 - 20mA
Motor
- +
Common
mA
Common
mA
Common
mA
Common
A
0- 5 V
or
0-10V
Motor
GND
V+
B
0- 5 V
or
0-10V
Motor
GND
V+
C
0- 5 V
or
0-10V
Motor
GND
V+
D
0- 5 V
or
0-10V
Motor
GND
V+
C1
C2
C3
C4
C5
C6
C7
C8
C9 C10 C11 C12
MODULATION OUTPUTS
Voltage
A
B
C
D