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7.
Rough-In Wiring
All low voltage wiring terminates in the wiring chamber
on the control. The wiring is roughed-in to the electrical
box prior to installation of the control. All field installed
wiring should meet or exceed requirements for class 2
wiring per article 725 of the National Electrical Code
rated at 30VAC/250VA. Ensure that enough wiring is in
the electrical box to reach the control.
CAUTION: Power must not be applied to any of the
wires during the rough-in wiring stage.
•
Run wiring from the outdoor Air Temperature
sensor 070 mounting location to the electrical box
for the control wiring. Do not run the wires parallel
to telephone or power cables. If the sensor wires
are located in an area with strong sources of
electromagnetic interference (EMI) shielded cable
or twisted pair should be used. If using shielded
cable, the shield wire should be connected to the
sensor location requires that the fluid is thor-
oughly mixed within the pipe before it reaches the
sensor.
•
Locate the labels attached to each sensor. One
sensor will be identified as the return sensor and
one will be identified as the supply sensor. (Fig 6F
& 6G) Mount the return sensor to the return piping
of the boiler loop. Mount the supply sensor to
supply piping of the system loop.
GRUNDFOS
®
071 Sensor
Return Sensor
Supply Sensor
MADE IN CANADA
LR 58223
E150539
5T62
x
Figure 6G - Supply Sensor Label
GRUNDFOS
®
071 Sensor
Return Sensor
Supply Sensor
MADE IN CANADA
LR 58223
E150539
5T62
x
Figure 6F - Return Sensor Label
