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
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
Zoneline® models offer
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 Zoneline units are compatible with most CDC and energy management systems. Zoneline units provide a 24 VAC circuit that powers the Central Desk Control system and no external power is needed.
All Zoneline 4100 and 6100 Series units are compatible with simple on/off
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 bus (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 busing and may damage internal components or cause erratic operation of the system.
3.A
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™ and Heat 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 or high limit temperature, the unit will automatically turn on until it reaches the preset shutdown temperature (46°F heating, 80°F cooling).
Connecting the Zoneline unit 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
Please see page 55 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 Busing | ||
| NOT PERMITTED | |
Unit #1 | Unit #2 | Unit #3 |
INCORRECT Common Busing | ||
| Normally Open | |
| Switch - |
|
Unit Operational | ||
| CDC Terminals |
|
| on Zoneline unit |
|
| Typical Wiring |
|
(All Wiring Shown Is Field Supplied) | ||
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