Honeywell 4074EDJ Test Plug & Resistor Assembly W7100

The Honeywell 4074EDJ Test Plug & Resistor Assembly W7100 is a part of equipment used for testing pneumatic control systems with a special focus on W7100 series pressure switches for HVAC Systems. This assembly consists of a test plug which can be plugged into the pressure switch port and disconnected from the air supply of the system. It also contains a resistor that is accurately adjusted to produce the electrical signal produced by the pressure switch when in normal use. This assembly, therefore, provides a convenient way through which the functionality of the pressure switch and the wiring associated with it can be tested without affecting the whole system.