Service Valve Connections, 117 | Fedders CH18ABD1 guide

Electrical Connections (cont.)

Connect control wiring

1.Route 24 volt control wires through control wiring grommet and connect leads to control wiring.

2.Use No. 18 AWG color coded, insulated wire. If thermostat is located more than 100 ft. from unit, as measured along the control voltage wires, use No. 16 AWG wire to avoid excessive voltage drop.

3.All wiring must be NEC Class 1 and must be separated from incoming power leads. Use furnace transformer, fan coil transformer, or accessory transformer for control power.

Note: Use of available 24 volt accessories may exceed the minimum power requirement. Determine total transformer load and increase the transformer capacity or split the load with an accessory transformer as required.

Final Wiring Check

Check factory wiring and field wire connections to ensure terminations are secured properly. Check wire routing to ensure wires are not in contact with tubing, sheet metal, etc.

SERVICE VALVE CONNECTIONS

Braze Joints

1.Remove the valve core from the schrader port. Wrap a quenching cloth around the service valve. Clean and flux the joint and braze with brazing rod containing at least 10% silver (such as silphos type brazing rod). DO NOT USE SOFT SOLDER. Replace the schrader valve core after brazing has cooled.

2.Leak-check all braze joints at approximately 80 psi pressure, purge and evacuate the lines.

WARNING

DO NOT USE AIR TO LEAK-CHECK BRAZE JOINTS. DRY NITROGEN SHOULD BE USED TO LEAK-CHECK.

WARNING

ALWAYS HAVE A FIRE EXTINGUISHER AVAILABLE WHEN WORKING WITH AN OPEN FLAME.

ALWAYS USE SAFETY GLASSES, PROTECTIVE CLOTHING, AND WORK GLOVES.

115
Torch	Service
	Service
	valve
Brazing rod
	Quenching cloth

Evacuation

The outdoor unit is factory charged. Evacuation is necessary on the uncharged portions of the total system. Purge the system with dry nitrogen. Then connect a vacuum pump and a vacuum gage capable of accurately measuring below 1,000 microns vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water.

WARNING

IF THE INSTALLER IS MAKING UP HIS OWN LINE SETS, HE MUST MAKE SURE THE TUBING IS CLEAN OF ANY IMPURITIES OR MOISTURE.

Opening the Service Valve (Step Valve)

NOTE: This is not a back-seating valve.

1.Remove the valve cap using an adjustable wrench.

2.Open the valve by inserting a hex wrench (3/16" for the liquid line, 5/16" for the vapor line) into the stem and back out counter-clockwise until the valve stem just touches the retaining ring. Do not over tighten.

3.Replace the valve cap finger-tight, then tighten an additional 1/12 turn or 1/2 hex flat. A metal-to-metal seal is now complete.

116
	Schrader
	valve port
Remove cap	Open valve	Replace cap

Opening the Service Valve (Straight Valve)

NOTE: This is not a back-seating valve.

Open the valve by using an adjustable wrench to turn the adjusting flange 1/4 turn counter-clockwise. The flange will come to a stop and the seal is now complete.

117

Adjusting flange

Open valve

CH18ABD1 specifications

The Fedders CH18ABD1 is a powerful and efficient air conditioning unit that is designed for residential and light commercial applications. This model is particularly popular for its ability to deliver rapid cooling and heating, making it an ideal choice for various climates and seasonal changes.

One of the standout features of the Fedders CH18ABD1 is its robust 18,000 BTU cooling capacity. This allows it to efficiently cool large spaces, making it suitable for medium to large rooms. The unit also offers a heating capacity, which provides flexibility for year-round comfort. The ability to switch between cooling and heating modes allows users to enjoy a comfortable indoor environment no matter the weather outside.

The Fedders CH18ABD1 is designed with advanced technologies that enhance its efficiency and performance. A key technology is its use of a high-efficiency compressor, which significantly reduces energy consumption while maintaining effective temperature control. Additionally, this model includes a programmable thermostat that allows users to set precise temperatures and schedules, promoting energy savings and convenience.

In terms of noise levels, the Fedders CH18ABD1 operates quietly, making it suitable for settings where noise is a concern, such as bedrooms or offices. The unit’s design incorporates sound-dampening features that minimize operational sound, ensuring an unobtrusive climate control experience.

Installation and maintenance of the Fedders CH18ABD1 is relatively straightforward. The unit is designed for easy mounting in windows or through walls, providing flexibility in placement. Regular maintenance is facilitated by accessible filters that can be easily cleaned or replaced, helping sustain optimal performance over time.

Furthermore, the unit is equipped with various modes, such as fan-only and auto-restart functions. The fan mode allows for air circulation without cooling, while the auto-restart function ensures the unit resumes its previous settings after a power outage.

In summary, the Fedders CH18ABD1 stands out for its powerful cooling and heating capabilities, advanced efficiency technologies, and user-friendly features. Its flexible operation, quiet performance, and ease of maintenance make it a reliable choice for anyone seeking an effective and efficient air conditioning solution. This unit is an excellent investment for those aiming to maintain a comfortable living environment throughout the year.