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Calibration, Operation Modes, and Control
Table 7. Local Heat Only With Parallel Fan Present (continued)
Configuration
Local Remote Fan
Fan and On/Off 
Not
electric (1 to 3 
applicable
stages)
Fan and On/Off
Not
hot water (1 to 3
applicable
stages)
Fan and
Not
Modulating hot
applicable
water
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Method of Control
Stage 1
Local thermostatic:
• On: Zt < HSP
• Off: Zt HSP + 0.5 °F (0.28°C)
Parallel fan
• Each stage represents an equal
percentage of total capacity.
• Total capacity is limited by
communicated supply heat
control.
Local thermostatic:
• On: Zt < HSP
• Off: Zt  HSP + 0.5°F (0.28°C)
Parallel fan
Total capacity is limited by
communicated supply heat control.
• Local PI capacity loop.
• Modulating valve capacity = Total
capacity.
• Valve drive incrementally open/
Parallel fan
closed.
• Total capacity limited by
communicated supply heat
control.
Stage 2
Local thermostatic:
• On: Zt < HSP - 1°F (0.56°C)
• Off: Zt  HSP - 0.5°F (0.28°C)
• Each stage represents an equal percentage of total capacity.
• Total capacity is limited by communicated supply heat control.
Local thermostatic:
• On: Zt < HSP - 1°F (0.56°C)
• Off: Zt  HSP - 0.5°F (0.28°C)
Total capacity is limited by
communicated supply heat
control.
• Local PI capacity loop.
• Modulating valve capacity = Total capacity.
• Valve drive incrementally open/closed.
• Total capacity limited by communicated supply heat control.
Stage 3
Local thermostatic:
• On: Zt < HSP - 2°F (1.11°C)
• Off: Zt  HSP - 1.5°F
(0.83°C)
Not applicable
Not applicable
VAV-SVX07B-EN