VAV Controller—Variable Air Volume (VAV) Controller 75
93F94F95FTroubleshooting
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
banana
100k ohm, 1/4 watt
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.
Figure 37: Double Banana Plug Used with 100k ohm Resistor
Hardware
Installation
Inspection
96F97F98FTools Needed
for
Troubleshooting
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