Trane Tracer VV550 Installation, Operation And Maintenance Manual page 104

Appendix D: Reheat Actuation Schedule Tables
Table 68. Local and remote heat with remote priority and no fan present
Configuration
Local Remote
On/Off hot water  On/Off hot water 
(1 stage) (1 stage) priority
On/Off hot water  Modulating hot
(1 stage) water priority
Modulating hot On/Off hot water 
water (1 stage) priority
Abbreviations: Zt = Zone temperature; HSP = Heating setpoint
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Method of control
Stage 1
Remote thermostatic
On: Zt < HSP
Off: Zt  HSP + 0.5°F
Each stage represents an equal percentage of total capacity.
Total capacity is limited by communicated auxiliary heat enable.
Remote PI capacity loop
Remote modulating calve capacity = 1/2 total capacity
Remote valve controls total capacity from 0% to 50%
Valve drive incrementally open/closed
Total capacity is limited by communicated auxiliary heat enable.
Remote capacity or
thermostatic
Remote On/Off valve 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.
Stage 2
Local thermostatic
On: Zt < HSP – 1°F
Off: Zt  HSP – 0.5°F
Local PI capacity loop
Local modulating valve capacity = 1/2 total capacity
Local valve controls total capacity from 51% to 100%
Valve drive incrementally open/closed
Stage 3
Not applicable
Not applicable
Local capacity
Local On/Off valve capacity =
1/2 total capacity
On: total capacity > 100%
Off: total capacity  50%
CNT-SVX17G-EN