SAMUEL JACKSON HG-1-1501, Service And Operation Manual

Page: 34 / 49

PAGE 31 of 46 HG-1-1501 GAS-FIRED HEATER
© SAMUEL JACKSON, INCORPORATED 2011 ALL RIGHTS RESERVED
THERMOCOUPLE WIRING
The following rules need to be followed when wiring the thermocouple temperature
sensors from the Thermocouple to the Heater electrical panel. The signal from the
temperature sensor is 4-20mA DC.
•
Always use shielded, 2 conductor cable from the thermocouple to the control panel
terminal blocks. Terminate the shield only on the electrical panel end. Do not use
Type J thermocouple wire for hookup.
•
Never run the shielded sensor wires with the power wiring (including 120 VAC
control wires). You can run several shielded 4-20mA shielded wires together in the
same conduit with other wires marked sensitive on the external connection diagram.
Part No. 21708 Type ‘J’
Thermocouple shown with
4-20mA Transmitter in junction
head.
Connect 4-20mA signal wires to
control cabinet to terminals 1
(+) , 2 (-) .
Red (-) wire from Thermocouple
junction goes to terminal 6.
White (+) goes from Thermocouple
junction goes to terminal 4.