WARNING

Never store anything combustible near or on your furnace. These include brooms, dustmops, vacuum cleaners, other cleaning tools or items, plastic or plaxtic containers, paper bags or other paper products. A fire could occur resulting in damage, injury or death.

2.3. ALTERATION OF FURNACE CONTROLS

WARNING

Do not alter any gas or electrical controls (gas control, pilot or safety controls) in any manner. Altering them could cause furnace to operate unsafely resulting in damage, injury or death.

SECTION 3 • UNDERSTANDING HOW YOUR FURNACE WORKS

Your installer should have given you a detailed explanation of how the furnace operates. Shown below are the basic operation characteristics and sequence of operation. If you have any questions consult your installer and/or service agency.

* * IMPORTANT * *

There are many types of thermostats compatible with this furnace. Make sure you understand the specific type installed. Ask installer for detailed explanation, and retain thermostat instruction manual for reference.

This furnace is equipped with a vent shut-off system which monitors the combustion air into the burners by means of a pressure sensing device. When the vent becomes blocked, this device turns off the gas valve circuit to prevent flue products from entering the structure. In the event that this occurs, shut off furnace and contact a qualified service agency.

3.1BASIC OPERATION – HEATING CYCLE

This furnace is operated by an Electronic Blower Control (EBC) and a gas control system which controls all functions of the furnace.

On a call for heat from the thermostat, the EBC first turns on the inducer motor. The pressure switch then closes signaling the ignition control to proceed with ignition function.

The ignition system consists of an intermittent pilot with a hot surface igniter to light pilot burner, senses flame, and then main gas valve opens with pilot flame lighting main burners.

There is a 60 second delay after main burner is on until the comfort air blower starts on heating (low) speed. After the thermostat is satisfied, the burners will go off as gas valve closes. The inducer will continue to run for 5 seconds, and the comfort air blower will continue to run for two minutes.

3.2BASIC OPERATION – COOLING CYCLE

On a call for cool the compressor and condenser fan will start immediately, and the comfort air blower will start 6 seconds later on cooling (high) speed. When the thermostat is satisfied the compressor and condenser fan will stop, and the comfort air blower will continue to operate for 60 seconds.

3.2.1COMPRESSOR LOCKOUT (CANADIAN UNITS ONLY)

The units built for Canadian use are equipped with high and low pressure controls. These controls protect the compressor from extreme conditions such as high refrigerant pressure or a loss of charge. When this happens the compressor is held off line by a lock out relay. To reset the lock out relay, the thermostat must be set to the “OFF” position and then returned to the normal operating position. The compressor is now allowed to function. If the compressor continues to lock out, service personnel should be called to check the unit.

3.3MANUAL FAN (CONTINUOUS AIRFLOW) OPERATION

If wall thermostat is set to MANUAL (ON) position to operate comfort air blower continuously to provide air circulation throughout the building, the blower will operate on the heating speed rather than the cooling as is typical with most systems. This permits the air to circulate as desired but helps keep the operating noise level down as well as conserving energy.

During a call for cooling, the blower automatically shifts up to cooling speed, and remains there until 60 seconds

after thermostat is satisfied then drops back to heating speed.

Manual 2100-279 Page 3

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3Com 43506 operating instructions Understanding HOW Your Furnace Works
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43506 specifications

The 3Com 43506, also known as the 3Com SuperStack 3 Switch 4400, is a robust networking solution designed for small to medium-sized enterprises that require a reliable and efficient way to manage their network traffic. This managed switch offers a variety of features and technologies that cater to both performance and flexibility, making it a popular choice in the industry.

One of the standout features of the 3Com 43506 is its ability to support Layer 2 and Layer 3 switching. This means that it can efficiently manage data packets at both the data link and network layers, ensuring optimal traffic management and routing. This versatility is essential for organizations that need to segment their networks and control the flow of information between different departments or units.

The 3Com 43506 utilizes advanced switching technology that includes high-speed Ethernet connections, specifically 10/100/1000 Mbps rates on all ports. This enables the switch to handle large volumes of traffic without bottlenecks, making it ideal for bandwidth-heavy applications such as video conferencing or large file transfers. With its multiple Gigabit Ethernet ports, users can also connect high-performance servers and storage devices directly to the switch, enhancing overall network speed and reliability.

Quality of Service (QoS) is another significant feature of the 3Com 43506. This technology allows network administrators to prioritize certain types of data, ensuring that critical applications receive the bandwidth they need for optimal performance. For organizations that rely on voice-over-IP (VoIP) or real-time video services, QoS is invaluable for maintaining clear audio and video quality.

In terms of management, the 3Com 43506 offers comprehensive support for Simple Network Management Protocol (SNMP) and web-based management interfaces, providing network administrators with the tools to effectively monitor and configure the switch. The device also supports virtual LANs (VLANs), which enhance network security and efficiency by allowing the segmentation of network traffic.

Moreover, the 3Com 43506 is designed with reliability in mind. It features dual power supply support for redundancy, ensuring continued operation even in the event of a power failure. Its fanless design contributes to quiet operation, making it suitable for deployment in office environments where noise levels must be kept to a minimum.

Overall, the 3Com 43506 is a versatile and feature-rich switch that meets the demands of modern networking environments. Its combination of performance, advanced management features, and reliability makes it an excellent choice for businesses looking to enhance their network capabilities.
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