Johnson Controls A419 Series - Manual (Page 6)

6 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
Wiring
!
WARNING: Risk of Electrical Shock.
To avoid the risk of electrical shock, disconnect all
power sources to the control before wiring any
connections. More than one disconnect may be
required to completely de-energize the control and
equipment.
IMPORTANT: All wiring must conform to local,
national, and regional regulations. Use copper
conductors only for all wire connections. Do not
exceed the electrical ratings for the A419 control or
the equipment it is wired to.
See Figure 9, Figure 10, and Figure 11 for typical
examples of wiring an A419 control to the controlled
equipment.
Use wire no larger than 12 AWG when connecting to
the two lower terminal blocks (TB1 and TB2).
Note: Terminal block TB2 is an isolated SPDT
switch (dry contacts). The TB2 terminals have no
internal electrical connection to the A419 control.
Use wire no larger than 16 AWG when connecting to
the upper sensor terminal block (TB3).
Wire insulation rating must be 90°C, minimum.
A99 temperature sensors are not polarity sensitive.
Wire the leads to (+) SEN and (-) COM on the sensor
terminal block (TB3). See Figure 9, Figure 10, and
Figure 11.
Keep the leads between the control and sensor as
short as possible/practical in your application. The
additional resistance in long sensor leads creates error
between the actual temperature and the displayed
temperature. See Table 1 when extending sensor
leads.
Temperature sensor signals may be affected by
electrical interference. When extending sensor cable
beyond 50 ft (15.2 m) use a twisted-pair, shielded
cable to reduce electrical interference.
If the Temperature Offset function is used, wire a
switch (such as a switching time clock) between the
binary input terminal (BIN) and the common terminal
(COM). See Figure 9, Figure 10, and Figure 11 for
terminal strip location.
A419GBF-1
24 VAC
Class 2
Transformer
A419GEF-1
T
1
T
2
N
C C
N
O
TB2
TB1
Cable
Shield
(if used)
TB3
(+)
(+)
(–)
(Optional)
Binary Input
Switch
BIN
SEN
COM
A99
Sensor
24 VAC
Load
Figure 9: Wiring the 24 VAC A419 Control
2
4
0
A
C
C
O
M
1
2
0
N
C C
N
O
A419ABC-1
120 VAC
Neutral
A419AEC-1
TB2
TB1
A99
Sensor
Cable
Shield
(if used)
TB3
(+)
(+)
(–)
(Optional)
Binary Input
Switch
BIN
SEN
COM
120 VAC
Load
Figure 10: Wiring the 120 VAC A419 Control
2
4
0
A
C
C
O
M
1
2
0
N
C C
N
O
A419ABC-1
240
VAC
A419AEC-1
TB2
TB1
A99
Sensor
Cable
Shield
(if used)
TB3
(+)
(+)
(–)
(Optional)
Binary Input
Switch
BIN
SEN
COM
L1
L2
240 VAC
Load
Figure 11: Wiring the 240 VAC A419 Control