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W7752D,E,F,G,J FAN COIL UNIT CONTROLLERS
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The W7752D,E,F,G and J Controllers are communicating mains-powered Fan Coil Unit Controllers in the Excel 10 product line. They cover a wide range of fan coil control applications. The controllers can operate as stand-alone units or networked using the standard Echelon LONWORKS® bus. Interfaces are provided for a wide range of actuator types. Heating systems can be water or electric, and cooling systems can be chilled water supply or compressors. Extensive timing and interlock features make the W7752 especially suitable for systems using electric heat and compressors.
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W7752D2007 |
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230 Vac |
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X |
W7752E2004 |
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230 Vac |
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W7752F2002 |
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115 Vac |
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X |
W7752G2000 |
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115 Vac |
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W7752J2003 |
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100 Vac |
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® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc.
All Rights Reserved
'(6&5,37,21
The W7752D,E,F,G and J are LONMARK compliant Fan Coil Unit Controllers in the Excel 10 family product line. These controllers provide room temperature control for two and four pipe fan coil units with optional electric heating coils (W7752D,F) and can control single, two or three speed fans. The controller is provided with default configuration settings from the factory and is fully operable on installation. Using standard Echelon configuration tools, the controller can be configured with job-specific settings. A variety of optional wall modules interface with the FCU Controllers and provide any or all of the following: setpoint adjustment, fan speed adjustment, and an occupancy bypass button. All wall modules include a space temperature sensor, however, a remote C7068A return air sensor can also be used.
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Heating |
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Floating, thermal, PWM, on/off, multi- |
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stage electric. |
Cooling |
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Floating, thermal, PWM, on/off, multi- |
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stage compressor. |
Fan |
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On/off, 2-speed, 3-speed |
Electric reheat |
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On/off |
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Heat and cool sequences can be selected to be active or not active, giving a total of eight different sequence options (each can be with or without fan control):
-Heat only
-Cool only
-Heat/cool changeover
-Heat and cool sequence
-All of the above with electric reheat.
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The controller has the following modes of operation.
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This is the normal operating condition for a room or zone when it is occupied. The controller can be switched into this mode by a network command, by the room occupancy sensor, or by a bypass button on the wall module. In the occupied mode the fan is controlled by the setting of the fan speed switch on the wall module or by the control algorithm when the switch is set to “auto.” The fan can be configured to remain on or turn off during the zero energy band.
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The standby mode saves energy by reducing heating or cooling demand during periods where the room is temporarily unoccupied. In this mode the fan is switched off during the zero energy band.
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This mode is used for longer unoccupied periods, such as at night or during weekends and holidays.
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If the controller is configured for window open detection, the controller automatically disables heat and cool control until the window is closed again. Frost protection remains active.
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If the temperature drops below 46°F (8°C), the controller enables the heating circuit as frost protection.
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The fan can be turned on or off by network command for smoke control.
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When configured with an air flow detector, the controller protects equipment by disabling the system when the fan fails.
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The controller operates two-pipe FCUs configured with a changeover input.
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The W7752D and W7752E are 230 Vac versions and are identical except for one additional relay in the W7752D for switching electric heat coils. The W7752F and W7752G are 115 Vac versions of the W7752D and W7752E, respectively. The W7752J is a 100 Vac version of the W7752E.
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Digital |
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Window/occupancy/ |
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closed £400 W (1.5 mA), |
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changeover/air flow |
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open ³ 10 kW (4.8 V) |
Analog/ |
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Fan speed/override |
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resistor network |
Digital1 |
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Analog |
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Temperature |
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20k ohm NTC |
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sensor |
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Analog1 |
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Setpoint adjustment |
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10k ohm |
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2XWSXWV |
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Digital1 |
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Override LED |
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0/5 Vdc |
Triac |
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Heat and cool |
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24 Vac, 250 mA max. |
(2 pairs)2 |
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continuous, 650 mA |
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max. surge (£30 sec) |
Relay (3) |
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Fan switching |
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20 to 253 Vac, 3 A max. |
High |
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Electric heat |
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20 to 300 Vac, |
power |
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(resistive load) |
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10 A max. |
relay3 |
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6 A max. (UL916) |
1Wall Module connection only.
2See Table 2 for output type options.
3W7752D,F only.
74-2959-3 |
2 |
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