Johnson Controls METASYS VAV110 Technical Manual page 76

Installation
9 9 F 1 0 0 F 1 0 1 F
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Isolation and
Grounding
VAV100/101
76 VAV Controller—Variable Air Volume Controller
Inspect the mounted VAV to ensure proper installation. Refer to the
appropriate illustrations in the section of this technical bulletin titled
Installation Procedures and to the engineering drawings.
1. Check that the mounting screws holding the subassembly onto the base
frame are secure.
2. Verify that accessory equipment is connected and labeled correctly.
3. Ensure that the controller terminal connections are secure.
4. Verify that the N2 connections are secure and labeled correctly.
5. Verify that the VAV switches are appropriately positioned. (Refer to
the Wiring Details and Networking the Controller sections of this
technical bulletin.)
6. Verify that there are no unwanted earth ground connections to the
controller following the procedures below.
No earth ground connections are allowed when wiring a Series
VAV100/101 Controller. Although a single earth ground connection to the
common terminal of Series VAV110/111 and VAV140/141 Controller is
allowed, you may not want to use one. The same procedure as described in
the following text for VAV100/101 may be used when no earth ground
connections to VAV are intended.
This section will help you ensure proper isolation within your system.
These procedures are not required, but are recommended to reduce
installation errors. Use the following procedures to ensure proper isolation.
Test the:
•
field device wiring for proper isolation
•
transformer for isolation and correct polarity termination
•
connected field devices, transformer, and VAV for proper isolation
•
transformer and VAV for proper VA load requirements