Space Temperature Control: Fan-Powered Units - Trane VAV VV550 LonTalk Installation & Operation Manual

Sequence of Operations
Table 11. Local heat only with no fan present
Configuration
Local Remote
PWM electric Not applicable Local PI capacity loop
(1 to 3 stages)
On/Off electric Not applicable Local thermostatic
(1 to 3 stages)
On/Off hot water Not applicable Local thermostatic
(1 stage)
Modulating hot Not applicable Local PI capacity loop
water
Note: Abbreviations: Zt = Zone temperature; HSP = Heating setpoint
Table 12. Local heat only with parallel/series fans present
Configuration
Local Remote
Fan Not applicable
Fan + Not applicable
PWM electric
(1 to 2 stages)
Fan + Not applicable
On/Off electric
(1 to 2 stages)
Fan + Not applicable
On/Off hot water
(1 to 2 stages)
Fan + Not applicable
Modulating hot
water
Note: Abbreviations: Zt = Zone temperature; HSP = Heating setpoint

Space Temperature Control: Fan-Powered Units

VAV VV550/VV551 Controllers provide three fan options when in space temperature control mode:
•
•
•
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Method of control
Stage 1
Each stage represents an equal percentage of total capacity PWM Output (one stage = 100%; two stages
= 50% each; three stages = 33.33% each). Total capacity is limited by communicated auxiliary heat enable.
On: Zt < HSP
≥
Off: Zt HSP + 0.5°F (0.28°C)
Each stage represents an equal percentage of total capacity. Total capacity is limited by communicated
auxiliary heat enable.
On: Zt < HSP
≥
Off: Zt HSP + 0.5°F (0.28°C)
Total capacity is limited by
communicated auxiliary heat
enable.
Modulating valve capacity = Total capacity
Valve drive Incrementally open/closed
Total capacity limited by communicated auxiliary heat enable
Method of control
Stage 1
Parallel/Series Fans
Parallel/Series Fans
Parallel/Series Fans
Parallel/Series Fans
Parallel/Series Fans
One-speed ON/OFF series fan;
One-speed ON/OFF parallel fan;
Fan Off Delay
Stage 2
Local thermostatic
On: Zt < HSP - 1°F (0.56°C)
≥
Off: Zt HSP - 0.5°F (0.28°C)
Not applicable
Not applicable
Stage 2
Not applicable
Local PI capacity loop
Each stage represents an equal percent of total capacity (1-stage = 100%, 2
stages = 50% each) PWM output
Total capacity is limited by communicated auxiliary heat enable.
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 auxiliary heat enable.
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 auxiliary heat enable
Local PI capacity loop
Modulating valve capacity = Total capacity
Valve drive incrementally open/closed
Total capacity limited by communicated auxiliary heat enable
Stage 3
Local thermostatic
On: Zt < HSP - 2°F
≥
Off: Zt HSP - 1.5°F
Not applicable
Not applicable
Not applicable
Stage 3
Not applicable
Local thermostatic
On: Zt < HSP - 2°F (1.11°C)
≥
Off: Zt HSP - 1.5°F (0.83°C)
Not applicable
Not applicable
VAV-SVP01A-EN