heat-timer ETS-LT - 4-20 mA Remote Setpoint and Auxiliary Input Wiring

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HEAT-TIMER CORP.
059327–00 REV. C
04 INSTALLATION INSTRUCTIONS
WIRING THE 4–20MA REMOTE SETPOINT
WIRING AUX INPUTS—SENSORS OR SWITCHES (OPTIONAL)
1 Run the 4–20mA Setpoint wires through a knockout located on the bottom of the ETS-LT
Control Module enclosure.
2 Connect the positive (+) wire to terminal 26 on the ETS-LT Control module.
3 Connect the negative (–) wire to terminal 27 on the ETS-LT Control module.
• No voltage can be applied to terminals 22 and 23 or terminal 24 and 25.
• Auxiliary inputs can be configured as temperature sensors or as switch sensors.
When configured as a switch sensor, it must be connected to a device that
provides an open or close (short) only.
• Standard brass tube sensors (Heat-Timer P/N 904220–00) can be used in a well
if the temperature sensor is only monitoring the temperature. However, the
standard brass tube sensor in a well is not recommended when using the
Feed Forward function (refer to “Return Comp.” on page 27). The use of
Probe Sensor (Heat Timer p/n 904222-00) is strongly recommended for the
Feed Forward function.
1 To connect an Auxiliary temperature sensor:
a Run the sensor wires through a knockout located on the bottom of the ETS-LT
Control Module enclosure.
NOTE: The sensor wires can be extended up to 500 feet (152.5 meters)
using an 18 AWG shielded 2-conductor cable (Heat-Timer P/N 703001–01 or
equivalent #18/2 cable).
b Connect the sensor wires to terminal 22 and 23 on the ETS-LT Control Module.
c Connect the shield to terminal 23 on the ETS-LT Control Module.
NOTE: Do not connect the shield at the sensor end.
NOTE
The ETS-LT Control Module does not source power to the 4–20mA terminals. The EMS system must
provide the excitation voltage.
EMS SOURCE
VOLTAGE
SHIELD
+ –