Central Desk Control

Some installations may want to govern the ability of the unit to operate from a control device remote to the unit or even remote to the room in which the unit is located. The general term given to systems such as this is Central Desk Control. The most common installation of this type of system is a switch mounted at the registration desk and, upon guest check-in, a button is pushed or a switch is moved to allow the air conditioner to operate. Likewise, when the guest checks out the device is put into the “OFF” position so the unit will not operate while the room is vacant.

It is not necessary that the controlling device be located at a central desk to employ a device that will control the unit operation. For instance, in some resort areas devices are connected to sliding glass doors and opening the door causes a contact to close, turning the air conditioner off. This prevents energy being wasted by operating the air conditioner when warm, humid air is entering the room. Some systems operate by motion sensors or heat sensing detectors mounted in the room. These types of systems determine occupant presence in the room and allow the unit to operate; if no one is in the room the device signals the air conditioner to turn off.

Zoneline® models offer Load-Shedding capabilities on units connected to Central Desk Control Systems. For more information on the models’ Load-Shedding Feature, see page 10.

There is a wide variety of devices available, each with its own benefits and constraints. While GE does not offer components that are external to the unit for a Central Desk Control (CDC) system, GE Zonelines are compatible with most CDC and Energy Management systems. Zonelines provide a 24 VAC circuit that powers the Central Desk Control system and no external power is needed.

All Zoneline 2900, 3900, and 5800 Series units are compatible with simple on/off 2-wire Central Desk Control systems. Consult with the provider of other energy management systems to be sure they are compatible with the GE Zoneline. Zonelines have standard connectors factory-installed to provide a CDC interface that permits the unit to be connected to most of the energy management systems. The devices connected to the Zoneline units require no power supply or transformers external to the unit.

Important CDC Comments (all series applicable)

1.When the switching device closes the circuit of the CDC conductors, the unit operation stops.

2.Do not use a common buss (at the unit or at the switch panel) in the wiring. Both wires comprising the circuit must connect to the unit connectors and to the controlling switch. Running one wire from one unit to another unit is common bussing and may damage internal components or cause erratic operation of the system.

3.A 24-volt transformer is contained within the Zoneline. No external voltage may be applied to the unit through the CDC terminals. (Voltage on the CDC conductors is 24 volts AC.)

4.Recommended wire size must be followed as a minimum requirement.

Wire Size #AWG

Maximum Allowable Length

#22

600

Ft.

#20

900

Ft.

#18

1500

Ft.

#16

2000

Ft.

Freeze Sentinel™ remains operational when the unit is connected to a CDC system. Even if the unit is turned “OFF” at the central location, if the sensor at the unit detects the low temperature, the electric resistance heaters and the fan will automatically turn on.

Connecting the Zoneline to a CDC system does not eliminate the ability to connect the unit to a remote thermostat.

Once the circuit is “opened,” and control of the unit removed from the CDC system, the selected controls - either the unit mounted control or the remote thermostat - govern the operation of the unit.

Please see page 57 for installation recommendations for the Central Desk Control wiring.

CDC Terminal Location and Typical Wiring

See page 15 for location of CDC terminals on unit.

Example of Common Bussing

 

NOT PERMITTED

Unit #1

Unit #2

Unit #3

INCORRECT Common Bussing

 

Normally Open

 

 

Switch -

 

 

Unit Operational

 

CDC Terminals

 

 

on Zoneline

 

 

Typical Wiring

 

(All Wiring Shown Is Field Supplied)

14

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GE Monogram 2900 Series manual Central Desk Control, CDC Terminal Location and Typical Wiring, Maximum Allowable Length
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3900 Series, 2900 Series, 5800 Series specifications

The GE Monogram series is renowned for its commitment to excellence in kitchen appliances, offering high-end features, superior technology, and outstanding performance. Among the extensive lineup, the 3900 Series, 2900 Series, and 5800 Series stand out for their innovative designs and multifunctionality.

The GE Monogram 3900 Series is a flagship line that combines luxury with practicality. It features stainless steel construction for durability and elegance, along with a commercial-grade appearance that enhances any kitchen setting. One of its key characteristics is the advanced convection cooking technology, which ensures even heat distribution for perfectly cooked dishes. This series often includes options like dual-fuel ranges that provide the precision of a gas cooktop and the reliable performance of an electric oven. Smart technology integration allows users to control their appliances remotely, making meal preparation more convenient.

The 2900 Series presents a compelling option for those seeking high performance in a more compact form factor. This series is characterized by its sleek design and versatile capabilities, making it ideal for urban homes or smaller kitchens. The ovens typically feature multiple cooking modes, including a self-cleaning function and steam cooking options, which preserve nutrients in food while ensuring moist results. Energy efficiency is a priority in this series, with many units designed to reduce consumption without sacrificing power or performance.

On the other hand, the GE Monogram 5800 Series is designed for those who desire the pinnacle of culinary technology. With features like a dual-fuel convection oven and integrated temperature probes, home chefs can achieve restaurant-quality results. The 5800 Series boasts a variety of customizable settings that enable precision cooking, while the built-in smart technologies provide remote monitoring and alerts. The design integrates seamlessly with contemporary kitchens, featuring intuitive touch controls and high-quality finishes that reflect sophistication.

Each of these series embodies GE’s commitment to crafting appliances that inspire both culinary creativity and efficient cooking. With the Monogram brand, customers enjoy a blend of elegance, performance, and smart technology that makes preparing meals an effortless and enjoyable experience. Whether you choose the 3900, 2900, or 5800 Series, you’re investing in an appliance that brings professional-grade quality to your home kitchen.
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