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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 6 – BOILER SEQUENCING TECHNOLOGY
6.3.5 OPTION 5 - Remote Setpoint With Direct Wired Header Sensor
And 4-20ma Setpoint Drive
OPTION 5 - Remote Setpoint With Direct Wired Header Sensor And 4-20ma
Setpoint Drive Instructions
NOTE:
Both Header Sensor AND 4-20ma Direct Drive must be wired. See the C-More Controller User
Manual, OMM-0032 (GF-112) and ProtoNode User Manual, OMM-0080 (GF-129) for more
information.
Step 1: Direct Wired Header Sensor Wiring
1. On the MANAGER Unit, Connect the Header Temperature Sensor (P/N 61040) to the Feed
Forward (FFWD) terminals on the P-1 Harness Via the terminal block labeled Header Temp
sensor in the I/O Box.
NOTES:
•
The header sensor must be installed between 2 and 10 feet (0.61 and 3.1m)
downstream of the LAST boiler in the plant's supply water header.
•
Shielded pair 18 - 22 AWG cable is recommended for header sensor wiring.
•
There is no polarity to be observed.
•
The ground for the shield is at the "SHLD" terminal in the I/O the Box.
•
The sensor end of the shield must be left free and ungrounded.
TEMP SENSOR P/N 61040
Step 2: Direct Wired 0-20ma or 4-20ma Wiring
1. Connect the 4-20ma or 0-20ma terminals from the Direct Drive source to the Ain+ and Ain-
terminals on the Manager Unit's I/O Box.
NOTE:
•
Shielded pair 18 - 22 AWG cable is recommended for this connection. Polarity must be
observed.
•
The ground for the shield is at the driver signal source.
TEMP SENSOR P/N 61040
OMM-0121_D • GF-205 • 5/9/2019
HEADER TEMP SENSOR
HEADER TEMP SENSOR
(Continued)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
I/O BOX
I/O BOX
Page 107 of 122
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