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Table 5.
Calculating actual VA requirements (continued)
Item
Below is an example VA draw calculation for a BACnet MS/TP controller on a cooling-only VAV box:
Description
• Symbio no I/O
• Setpoint and Zone Temperature Sensor Input
• Air Flow Sensor Input
• Occupancy Input
• Binary Out for Air Damper (only one energized at a time, not
including actuator draw)
• Trane F Series Air Damper Actuator (Taken from
Total
Below is an example VA draw calculation for a BACnet IP controller on a hot water reheat VAV box:
Description
• Symbio 210e
• Setpoint and Zone Temperature Sensor Input
• Air Flow Sensor Input
• Binary Out for Water Valve (only one energized at a time, not
including actuator draw)
• Belimo Hot Water Actuator (TR24-3)
• Binary Out for Air Damper (only one energized at a time, not
including actuator draw)
• Trane F Series Air Damper Actuator (Taken from
Total
Below is an example VA draw calculation for a BACnet Zigbee controller with XM on a hot water reheat VAV box:
Description
• Symbio 210
(c)
• Air-Fi WCI (X13790901030)
• Air Flow Sensor Input
• XM32
• Binary Out for Water Valve (only one energized at a time, not
including actuator draw)
• Belimo Hot Water Actuator (TR24-3)
• Binary Out for Air Damper (only one energized at a time, not
including actuator draw)
• Trane F Series Air Damper Actuator (Taken from
Total
(a) Insignificant load.
(b) See device connected to DC supply for current draw.
(c) Older WCI version draw more current than current design.
•
•
Table 6.
Style
F - Style Actuator
Air Valve Actuator C through E Style
Fan Power Fan Output
Hot Water Proportional
Hot Water 2 Position
Electric Heater Magnetic Contactor
Electric Heater Mercury Contactor
BAS-SVX084A-EN
Sub
Table 7, p.
16)
Table 7, p.
16)
Table 7, p.
16)
Replace the control box cover after field wiring to prevent any electromagnetic interference.
Review
Table 7
for factory-installed components and voltage amperage.
Binary load values
VA Draw Per I/O (24 Vac)
Draw
• 8.0 VA
• 0 VA
• 0.3 VA
• 0.1 VA
• 0.1 VA
• 4.0 VA
12.5 VA
Draw
• 9.5 VA
• 0 VA
• 0.3 VA
• 0.1 VA
• 1.0 VA
• 0.1 VA
• 4.0 VA
15 VA
Draw
• 8.0 VA
• 0.5 VA (10 mA WCI power draw)
• 0.3 VA
• 5.0 VA (100 mA XM32 power draw)
• 0.1 VA
• 1.0 VA
• 0.1 VA
• 4.0 VA
19 VA
Volt Amps
4 VA
12 VA
6 VA
4 VA
6.5 VA
10 VA
12 VA
Wiring Installation
Maximum Total VA Draw (24
Vac)
15
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Troubleshooting
