Determining Maximum Current Load
The reference table below provides various current load combinations that may be encountered
when using multiple programs running simultaneously with Master Valve/Pump Start control
options.
The number of 24 VAC loads based on one station/valve operating per program are listed in the
Station Valves row. The Master Valve and Pump Start values are based on one load per circuit
and one or two Flow Modules each utilizing the individual Master Valve control output.
NOTE: The maximum total current load permitted is 1.20A @24 VAC. The valve and relay loads
shown in the chart are based on 0.30A @ 24 VAC (nominal). Actual current draw will vary with
make, model, configuration, and size of valves and/or relays utilized. Refer to the manufacturer’s
electrical specifications and recalculate the maximum number of loads permitted based on actual
values.
Appendix B – TMC-424E Current Load Data
29
TMC-424E – Output Current Load
Acceptable Marginal Exceeds Limit
Station Valves
Master Valves
Pump Start
Total Current
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