Johnson Controls A19D Series Installation Sheets Manual page 2

Fig. 3 -- Note color coded switch.
Mounting strap is held to control by
clamp screw. See Fig. 7 for mounting
.
instructions
on pipe, wrap strap around
pipe and place slot in strap
over tab on right side of case.
Tighten the strap screw to a
snug fit. Clip off or bend back
excess strap outside the cover
of the control.
3. Insulation attached to the rear
of control will minimize the
effect of ambient air
temperature on the set point of
control. If practical, replace a
portion of removed pipe
insulation for appearance.
Wiring
!
CAUTION: Disconnect
power supply before wiring
connections are made to
avoid possible electrical
shock or damage to
equipment.
All wiring should be made in
accordance with the national
Electrical Code and local codes.
The case is provided with a
7/8 in. (22 mm) diameter hole for
1/2 in. conduit to permit
installation of conduit where
required. The terminals of the
single-pole double-throw contact
unit are color coded with the red
Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53201
2 A19D Technical Bulletin
terminal common; red to blue
circuit opens on temperature
rise, red to yellow circuit closes
on temperature rise. See typical
wiring diagrams in Figs. 4 and 5.
Use copper conductors only.
1. On high temperature cutout
control applications, always
wire the "hot" line to the A19D
cutout control in accordance
with Fig. 4.
2. On low cutout control
applications, follow equipment
manufacturer's wiring
recommendations whenever
possible. Fig. 5 shows a
common wiring hookup for this
application.
!
CAUTION: Use terminal
screws furnished (8-32 x
1/4 in. binder head).
Substitution of other
screws may cause
problems in making proper
connections.
Temperature Cutout Stop
The temperature cutout stop is
an integral part of these controls
and can be field adjusted. To
set temperature cutout stop,
proceed as follows:
1. Set dial to temperature at
which stop is desired.
2. Remove control cover.
3. Loosen the cutout stop screw,
slide the screw to the front of
the control against the plastic
step behind the dial and
tighten the screw. (See Fig. 6.)
Sometimes an exact stop
setting is not possible and the
stop must be set to the closest
step corresponding to the dial
setting required.
Checkout Procedure
Before applying power, make sure
installation and wiring connections
are according to job specifications.
Before leaving the installation, at
least three complete operating
cycles should be observed to see
that all components are
functioning correctly.
Repairs and Replacement
Field repairs must not be made.
For replacement control, contact
the nearest Johnson Controls
wholesaler.
Printed in U.S.A.