Trane Tracer VV550 Installation, Operation And Maintenance Manual page 106

Appendix D: Reheat Actuation Schedule Tables
Table 70. Local and remote heat with local heat priority and parallel fan present (continued)
Configuration
Local Remote
Modulating hot
Fan priority
water
Fan +
PWM Electric On/Off electric 
(one-stage) (1 stage)
priority
Fan +
On/Off electric 
On/Off Electric
(1 stage)
(one-stage)
priority
Fan +
On/Off hot water  On/Off hot water
(one-stage) (1 stage)
priority
a. For more information on fan operation, see
Abbreviations: Zt = Zone temperature; HSP = Heating setpoint
Table 71. Local and remote heat with remote heat priority and parallel fan present
Configuration
Local Remote
Fan + On/Off Electric
PWM Electric (one-stage)
(one-stage) priority
Fan + On/Off Electric
(one-stage)
On/Off Electric
priority
(one-stage)
Fan + On/Off hot water
On/Off hot water  (one-stage)
(one-stage) priority
a. For more information on fan operation, see
Abbreviations: Zt = Zone temperature; HSP = Heating setpoint
106
Method of control
a
Stage 1
Parallel fan
Parallel fan
Parallel fan
Parallel fan
"Fan Control," p. 64.
Method of control
a
Stage 1
Fan
Fan
Fan
"Fan Control," p. 64.
Stage 2
Remote PI capacity loop
Remote modulating valve capacity = Total capacity
Remote valve controls total capacity from 0% to 100%
Valve drive incrementally open/closed
Total capacity is limited by communicated auxiliary heat enable.
Local PI capacity loop
Local heat capacity = 1/2 total
capacity
Local heat controls capacity
from 0% to 50%
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)
Each stage represents an equal percentage of total capacity.
Total capacity is limited by communicated auxiliary heat enable.
Stage 2
Remote capacity or
thermostatic
Remote heat capacity = 1/2
total capacity
On: total capacity  50% or Zt
< HSP – 0.5°F
Off: total capacity  0% or Zt 
HSP + 0.5°F
Total capacity is limited by communicated auxiliary heat enable.
Remote 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.
Remote 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.
Stage 3
Remote capacity
Remote heat capacity = 1/2
total capacity
On: total capacity  100%
Off: total capacity  50%
Remote thermostatic
On: Zt < HSP – 2°F (1.11°C)
Off: Zt  HSP – 1.5°F (0.83°C)
Remote thermostatic
On: Zt < HSP – 2°F (1.11°C)
Off: Zt  HSP – 1.5°F (0.83°C)
Stage 3
Local PI capacity loop
Local heat capacity = 1/2 total
capacity
Local heat controls capacity
from 50% to 100%
PWM output
Local thermostatic
On: Zt < HSP – 2°F (1.11°C)
Off: Zt  HSP – 1.5°F (0.83°C)
Local thermostatic
On: Zt < HSP – 2°F (1.11°C)
Off: Zt  HSP – 1.5°F (0.83°C)
CNT-SVX17G-EN