Hubbell Electric Heater Company V15 - Manual (Page 8)

8
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).
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.
Individually Fused Elements
To prevent the possibility of damage to control circuits and other elements in case of electrical
overloads, fuses may be supplied for each element. Two types of fuses may be used; a type NON for
voltages less than 250-volt or type JJS for voltage less than 600-volt.
Type JJS Type NON
Built-in Circuit Breaker
A built-in circuit breaker may be provided with or without shunt trip protection for protection from
circuit overload.
Building Management System (BMS)
A Building Management System control package may be supplied for remote operation and alarm
capabilities.
Pump Interlock Terminal Block
An optional pump interlock terminal block may be installed to prevent energizing when the pump is not
running.