Troubleshooting - Johnson Controls METASYS VAV110 Technical Manual

Hardware
Installation
Inspection
Tools Needed
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for

Troubleshooting

Troubleshooting
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We recommend that once the mechanical contractor starts receiving
delivery of the VAV boxes with factory mounted controls, arrangements
are made to pull a sample of the shipment and bench test it by loading a job
configuration before all the boxes are mounted in the ceiling.
It can also be advantageous to keep a box off to the side for use in training
the balancing contractor on a bench setup, rather than a live box mounted
in the ceiling.
!
CAUTION: Equipment Damage Hazard. Before starting, make
sure power is switched off.
Tools needed for typical troubleshooting include:
•
ASC and N2 Bus Networking and Troubleshooting Guide
(LIT-6363003)
•
Digital Multimeter (DMM)
•
100k ohm resistor
•
double banana plug (optional; shown in Figure 37; available from local
electronics store or ITT Pomona Stock No. 34F856 or 3F845), 1/4 watt
for earth ground voltage tests
100k ohm, 1/4 watt
banana
Figure 37: Double Banana Plug Used with 100k ohm Resistor
Use double banana plug for all tests that require
a 100k ohm resistor placed in parallel with DMM.
Steps:
1. Connect 100k ohm resistor under plug's prongs.
2. Insert banana plug into DMM.
3. Connect leads of DMM into banana plug.
VAV Controller—Variable Air Volume (VAV) Controller 75