Honeywell 301EM-20 Controller

The complete solution for Mechanical Rooms. Monitor up

to 20 sensors for Refrigerant, Toxic and Combustible gases.

The 301EM-20 acts as a controller for up to 20 remote

sensors and suits a variety of gas detection system solutions

for Mechanical Rooms.

Particularly configured to meet ASHRAE 15. B-52 and International

Mechanical Code requirements, the 301EM-20 is commonly used

to optimize gas detection in mechanical and chiller rooms. A full

complement of sensors (including toxic, oxygen, combustible gases

and a full line of refrigerant sensors), horns, strobes and remote

panels provide added flexibility to suit a variety of gas detection

system solutions.

ASHRAE No 15 Mechanical Standard

and B-52 Code Compliance

The ASHRAE and B-52 security standards have been established to

minimize risk and protect the safety of mechanical room personnel

and the environment at large. Available in a special configuration,

the 301EM-20 mechanical room controller has been carefully

designed to meet and even exceed these rigorous standards.

The 301EM can be configured to offer automatic fan, horn and

strobe activation in addition to manual fan activation.

Latching relay for manual alarm recognition, silence key for manual

horn deactivation, built-in 24 Vdc outputs for horn operation, and

2 breakglass switch accessories for manual alarm activation

ensure optimal performance.

User Friendly

• Easy to read LCD display

• Auto-diagnostic capabilities

Economical Solution

•  Cost-effective answer for installation in Mechanical

Rooms locations

Flexible Operation

• Able to operate with up to 20 remote sensors at a time

•  Various types of sensors available to simultaneously

detect a range of different Refrigerant, Toxic and

Combustible gases

• Robust and reliable RS-485 Modbus communication

Output Adaptability

• Three 24 Vdc alarm outputs and four 4-20 mA outputs

Safety Measures

• Four fully programmable relays

•  Three alarm levels with built-in visual indicators and

audible alarm

Beneficial Options

• Convenient stand-alone or network operation