Wiring Guide

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Figure 1 Steam/Hot Water Unit Heater Wiring Diagram - 115 V/1 Ph (Except V/VN, PT/PTN, WVC/WVN, WPC/WPN 333)
All wiring must comply with national electric code and all local codes. All components must agree with their respective power source. Transformer not required when seperate 115V power is supplied. Where 230V is shown, 200V may be substituted. Use 105°C wire for replacements
5H69154B15 Rev. E Single phase power supply, line voltage thermostat.
Abbreviations and Symbols
XFMR Transformer
V Volts
Hz Cycle or Hertz
φ Phase
“J” Box Junction Box
t Thermostat
VA Volt-Ampere
H1, H2, etc. Transformer Primary Terminals
O.L.C. Overload Contact
X1, X2, etc. Transformer Secondary Terminals
L1, L2, etc. Electric Load Terminals
T1, T2, etc. Starter or Motor Terminals
Wire Color Coding
BK Black
BL Blue
BR Brown
R Red
W White
2
1-454.10