Floating Control - Johnson Controls NXA-FCU-01 Installation Manual

Installation Guide

FLOATING CONTROL

If the heating control is a modulated valve, then DO4 and DO5 are used to
increment and decrement the actuator and open the valve to increase or
decrease the heated water flow and increase or decrease the heating output.
DO4 must be wired to Heating Increment and DO5 must be wired to Heating
Decrement.
Wiring for the Heating Increment and Heating Decrement is shown in Figure
19. To wire DO4 and DO5 for Heating Increment and Heating Decrement:
1. Connect the HOT terminal to the Common lead of the actuator motor.
2. Connect the DO4 terminal to the Increment lead of the actuator motor.
3. Connect the DO5 terminal to the Decrement lead of the actuator
motor.
J3
Figure 19. DO4 and DO5 - Heating Increment and Decrement Wiring.
26
FCU Controller
HOT DO5 DO4 HOT DO3 DO2 HOT DO1 AO1 AGND
INCREMENT
ACTUATOR
DECREMENT
MOTOR
COMMON
VALVE