Honeywell W7750A specifications Description of Devices, Typical system overview

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

INTRODUCTION

LONWORKS network (LONWORKS Bus) for communications, and conforms with the LONMARK HVAC Interoperability standard for Roof Top Unit Controllers (see Fig. 9).

Description of Devices

The W7750 is the Constant Volume Air Handling Unit (CVAHU) Controller in the Excel 10 product line family. The CVAHU is a LONMARK compliant device designed to control single zone and heat pump air handlers. W7750 systems control the space temperature in a given zone by regulating the heating and cooling equipment in the air handler that delivers air to that space. The W7750 air handler is typically an all-in-one constant air volume packaged unit, located on the roof of the building. In addition to standard heating and cooling control, the W7750 provides many options and advanced system features that allow state-of-the-art commercial building control. The W7750 Controller is capable of stand-alone operation; however, optimum functional benefits are achieved when the network communication capabilities are used. The W7750 utilizes the Echelon

The T7770 or T7560 direct-wired Wall Modules are used in conjunction with W7750 Controllers. The zone controlled by the W7750 Controller typically can use a T7770A through D or a T7560A,B Wall Module. Additional features available in T7770A through D models include analog setpoint input knob, override digital input pushbutton, override status LED and LONWORKS Bus network access jack. Additional features available in T7560A,B models include analog setpoint input knob, override digital input pushbutton, humidity sensor (T7650B model), override status LCD and digital display.

The Q7750A Excel 10 Zone Manager is a communications interface that allows devices on the LONWORKS Bus network to communicate with devices on the standard EXCEL 5000 System C-Bus. Fig. 1 shows an overview of a typical system layout. The Q7750A also provides some control and monitoring functions.

Q7752A																C-BUS COMMUNICATION NETWORK
LONWORKS BUS
SERIAL
ADAPTER
															EXCEL 10
															Q7750A
PERSONAL COMPUTER TOOLS															ZONE		EXCEL 500
E-VISION															MANAGER	EXCEL BUILDING SUPERVISOR
CARE
															C-BUS TO LONWORKS BUS
															INTERFACE DEVICE		Q7740A
LONWORKS-BUS COMMUNICATIONS NETWORK																	2-WAY
															LONWORKS BUS COMMUNICATIONS NETWORK		REPEATER
31	30	29	28	27	26
						25	24	23	22	21	20	19
													18	17	16

	EXCEL 10															EXCEL 10 W7751F
	W7750B
	CVAHU															PANEL PLENUM
	CONTROLLER															MOUNT VERSION
																VARIABLE AIR VOLUME
Q7751A	1									10	11	12	13	14	15	CONTROLLER
		2	3	4	5	6
							7	8	9
FTT
LONWORKS BUS
ROUTER
	EXCEL 10 T7770															EXCEL 10 T7560A, B
	WALL MODULE															WALL MODULE

M17487

Fig. 1. Typical system overview.

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