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8 | INSTALLING THE FREEZE SENSOR DDC Field Installation Guide

DDC Field Installation Guide8 733 904 851 Revised 05-13 Subject to change without prior notice

INSTALLING THE FREEZE SENSOR

1. Route the provided freeze sensor to the

refrigeration line of the water coil. (Figure #7)

Figure # 7

2. Use the two(2) supplied tie-wraps to mount

the sensor. (Figure #8)

Figure # 8

3. Use the provided cork tape to wrap the

sensor.(Figure #9)

4. Apply the provided pipe insulating tape to

provide good thermal connection to the

sensor. (Figure #4)

Figure # 9

5. Connect the terminated ends of the sensor

wires to the UPM board at the location(s)

specified in Figure #1 & #2;

• For UPM-I units connect the sensor on the

water coil to Freeze 1.

• For UPM-II units connect the sensor on the

water coil of the first compressor to Freeze

1, and connect the sensor on the water coil

of the second compressor to Freeze 2.

UPM TO DDC ALARM CONNECTION

1. Locate the Alarm (ALR) Contacts on the

corresponding UPM-I or UPM-II board per

Figure #1 & #2.

2. Connect the cables labeled OUT and COM from

the DDC wiring harness to the spade

connectors labeled OUT and COM on the UPM

board.

If the unit is already equipped with the

freeze sensor option, verify sensor

location per Figure #7 and skip the

following steps.

There is no polarity for these wires.

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