Steffes HPB22 Owners Manual - Manual (Page 25)

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UNIT LINE VOLTAGE WIRING DIAGRAM FOR THE
HEAT PUMP BOOSTER MODEL HPB22B
(FIGURE 14)
NOTE: Use copper or aluminum conductors rated for 75C or higher for field connection of this device.
Diagrams show high blower run speed. For low and medium speeds, see fan speed selections, Figure 11.