Product Overview

A19AUC, A19BUC Product Bulletin
3
Wiring
!
CAUTION: Disconnect the
power supply before
connecting the wiring or
removing the cover to avoid
possible electrical shock or
damage to the equipment.
On multipole units, more
than one circuit may have
to be disconnected. Keep
the assembly tightly closed
while circuits are alive.
Note: Use terminal screws
furnished (8-32 x 1/4 in. binder
head). Substitution of other
screws may cause problems in
making proper connections.
Follow the equipment
manufacturer’s wiring diagrams
when supplied. The knob and
cover must be removed to make
wiring connections. Make all
wiring connections using copper
conductors only, and in
accordance with the National
Electrical Code and local
regulations.
Wiring terminals are color coded
to simplify wiring. The red
terminal is common. The red to
yellow circuit closes on
temperature increase, and the
red to blue circuit opens on
temperature increase. Use
copper conductors only. Do not
bind the adjusting knob when
the cover is replaced.
Checkout Procedure
Before leaving the installation,
observe at least three complete
operating cycles to be sure that
all components are functioning
correctly.
Repairs and Replacement
Field repairs must not be made.
For a replacement thermostat,
contact the nearest Johnson
Controls distributor.