Trane Tracer Uc page 51

Table 6. Local Heat Only With No Fan Present
Configuration
Local Remote
PWM electric
Not applicable
(1 to 3 stages)
SCR electric Not applicable
On/Off electric
Not applicable
(1 to 3 stages)
On/Off hot
water Not applicable
(1 stage)
Modulating hot
Not applicable
water
Table 7. Local Heat Only With Parallel Fan Present
Configuration
Local Remote Fan
Not
Fan
applicable
Fan and PWM
Not
electric (1 to 3
applicable
stages)
Not
SCR electric
applicable
VAV-SVX07B-EN
Stage 1
• Local PI capacity loop
• 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 supply heat control
• Local PI capacity loop
• SCR heat capacity = total
capacity
• Total capacity limited by
communicated supply heat
control
Local thermostatic:
• 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
supply heat control.
Local thermostatic:
• On: Zt < HSP
• 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
Method of Control
Stage 1
Parallel fan Not applicable
• Local PI capacity loop.
• Each stage represents an equal
percentage of total capacity PWM
Output (one stage = 100%; two
Parallel fan stages = 50% each; three stages
= 33.33% each).
• Total capacity is limited by
communicated supply heat
control.
• Local PI
capacity
loop
• SCR heat
capacity =
total
capacity Not applicable
• Total
capacity
limited by
communica
ted supply
heat control
Calibration, Operation Modes, and Control
Method of Control
Stage2
Not applicable
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 supply heat control.
Not applicable
Stage 3
Not applicable
Local thermostatic:
• On: Zt < HSP - 2°F
• Off: Zt  HSP - 1.5°F (16.9°C)
Not applicable
Not applicable
Not applicable
Stage 3
Not applicable
SCR electric
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