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Table 3. Calculating Actual VA Requirements
Item
UC400 Board
24 Vdc Supply
Binary Outputs (Relay and TRIAC)
BO1 to BO3
BO4 to BO9
Below is an example calculation for a cooling-only box current requirements:
Description
• UC400 no I/O
• Setpoint and Zone Temperature
• Flow
• Occupancy Input
• Binary for Air Damper (only one energized at a time, not
including actuator draw)
• Total
With a Trane F Series Box:
(a) See device connected to DC supply for current draw.
•
•
Table 4.
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
Note: VariTrane cooling-only Series D and E models consume 20 VA (12 VA for the actuator and 8 VA for the board). The
VAV-SVX07B-EN
Sub
UC400 (No I/O)
5 x AI
2 x UI
2 x PI
3 x BI
2 x AO
3 x BO (Relay)
6 x BO (TRIAC)
(a)
200 mA
Replace the control box cover after field wiring to prevent any electromagnetic interference.
Review Table 4 for factory-installed components and voltage amperage.
Binary Load Valves
heating output ratings remain the same.
VA Draw Per I/O (24 Vac)
0.2 VA per AI
0.13 VA per UI
0.13 VA per PI
0.17 VA per BI
1 VA Per AO
1 VA Per Relay (No Load)
0.34 VA Per TRIAC (No Load)
1 VA Per 25 mA DC
Refer to "Device Connections," p. 10
0.5 A- 12 VA@ 24 Vac
Draw
• 8 VA
• 0.4 VA
• 0.13 VA
• 0.17 VA
• 0.34 VA
• 9.2 VA (Plus air damper draw)
13.2 VA Total
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)
8 VA
1 VA
0.25 VA
0.25 VA
0.5 VA
2 VA
3 VA
1 VA
Subtotal for UC400; 16 VA
8 VA
Total for UC400; 24 VA
Refer to "Device Connections," p. 10
12 VA Maximum
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