Watlow Series 942 - Manual (Page 20)

Install and Wire, Chapter 2
20 WATLOW Series 942 User's Manual
Terminal Function
1 Not Used
2 Not Used
3 Not Used
4 Not Used
5 Not Used
6 Not Used
7 T.C. +
8 Not Used
9 T.C. -
10 L1 240V
11 L1 120V
12 L2
13 Earth Ground
14 N.O.
15 Com.
16 Com.
17 N.O.
18 N.C.
Output #1
Output #2
945A-2DD0-A000
Wiring Example
Figure 30 -
System Wiring
Example
CAUTION:
All wiring and fusing must conform to the National Electric Code NFPA70. Con-
tact your local board for additional information. Failure to observe NEC safety
guidelines could result in injury to personnel.
WARNING:
Watlow mercury relays are designed to be used only with resistive loads.
942A-1DD0-A000
Integral Setpot
140A-16XX-6000
High Limit Control
(-) (+)TC Input
L1
L1
L2
Type "J"
Thermocouple
Fuse
Mercury
Relay for
Control
L2
Fuse
Load
Power
L2
High Limit
Control Power
120 VAC
Indicator ON
when limit trips
High Limit
Mechanical
Contactor
Limit Sensor Process Sensor
Coil
π
Heat
Load
945A-2DD0-A000
Temperature Control
Earth Ground
L1
L2
(+)
(-)Red
Normally Open
Momentary Switch
9
7
11
12
13
Fuse
L1 14
15
16
17
T/C T/C
ControlPower
120 VAC
L2
Indicator ON when
limit trips
942A-1DD0-A000
Temperature Control
!
!