Termination Details - Johnson Controls Metasys VMA1610 Installation Instructions Manual

Table 2: Cable Length Guidelines for Recommended Wire Sizes
Guideline Wire Size/Gauge and Type
A 1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
B 1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
C See Figure 7
Use stranded copper wire.

Termination Details

A set of Johnson Controls® termination diagrams provides details for wiring inputs and outputs to the controllers.
See the figures in this section for the applicable termination diagrams.
Table 3: Termination Details
Type of Field Device
Voltage Input - External
Source
Voltage Input - Internal
Source
VMA1610 and VMA1620 Variable Air Volume Controllers Installation Instructions
to select wire size/gauge.
Type of Termination Diagrams
Input/Output
UI
UI
UI
Maximum Cable Length and Type
457 m (1,500 ft) twisted wire
297 m (975 ft) twisted wire
183 m (600 ft) twisted wire
107 m (350 ft) twisted wire
229 m (750 ft) twisted wire
137 m (450 ft) twisted wire
91 m (300 ft) twisted wire
61 m (200 ft) twisted wire
See Figure 7 to determine cable length.
Use twisted wire cable.
Assumptions
100 mV maximum voltage drop
Depending on the cable length
and the connected input or
output device, you may have to
define an offset in the setup
software for the input or output
point.
100 mV maximum voltage drop
Depending on the cable length
and the connected input or
output device, you may have to
define an offset in the setup
software for the input or output
point.
N/A
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