Mechanical installation
Prepare the hole for the installation
The options to mount the PTU 025 unit on an IP55/66
enclosure include the following:
•
Factory-installed M25 tread.
•
Using the knock-out plate.
•
Making a new hole in the connection plate. Hole
diameter: 25 mm (0.98 in).
Illustration 1.2 PTU 025 Installation Hole
For grounding purpose, ensure that there is a good electrical
connection between the PTU 025 mounting star washer and
the enclosure.
Installing the Unit
To install PTU 025:
1. Place the gasket between the PTU 025 unit and the
enclosure. This is necessary for the IP55/66 rating.
2. Inside the enclosure, place the star washer, the
ground connection, and the nut. See Illustration 1.3.
3. Put the ground wire inside the enclosure through the
star washer, the ground connection, and the nut.
4. Rotate the unit to the required position. The unit can
be rotated 360°.
5. Fasten the nut with the momentum 5 Nm. The unit
cannot be rotated after fastening the nut. See
Illustration 1.4.
Illustration 1.3 The Nut, The Ground Connection, The Washer, The
Gasket
Illustration 1.4 Positioning the Unit
Installation Instructions
Pressure Transmitter Unit PTU 025
VLT
®
HVAC Drive FC 102
MI08A102 Danfoss A/S © 12/2017 All rights reserved.
3
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