Hubbell Electric Heater Company " SE " - Manual (Page 8)

8
Fused Low Voltage Transformer
A fused low voltage transformer may be supplied. This option is used to step down higher voltages to
120-volt for the control circuit.
Dial Temperature and Pressure Gauge
A combination temperature (70° - 250° F) and pressure (0 – 200 psi) gauge with 2½-inch dial may be
supplied for in-line installation (shipped loose) or factory installed in the tank.
Vacuum Relief Valve
A vacuum relief valve may be provided with the unit to reduce the risk of back siphonage and back
pressure of the system. The valve will be shipped loose for in-line installation. Instructions for
installation are provided with the valve.