EXCEL 10 W7753A UNIT VENTILATOR CONTROLLER  
					24 VAC  
					120/240 VAC  
					TRANSFORMER  
					W7753A  
					W7753A  
					W7753A  
					2524  
					2524  
					2524  
					1
					1
					1
					EARTH  
					GROUND  
					EARTH  
					GROUND  
					EARTH  
					GROUND  
					M12682  
					Fig. 5. Power wiring details for two or more Excel 10s per transformer.  
					NOTES: (For Communications Wiring)  
					—
					All field wiring must conform to local codes and  
					ordinances (or as specified on the installation  
					drawings).  
					24 VAC  
					LINE VOLTAGE  
					GREATER  
					THAN 150 VAC  
					—
					Approved cable types for E-Bus communications  
					wiring is Level IV 22 AWG (0.34 mm ) plenum  
					TRANSFORMER  
					W7753A  
					2
					and non-plenum rated unshielded, twisted pair,  
					solid conductor wires. For nonplenum areas, U.S.  
					part AK3781 (one pair) or U.S. part AK3782 (two  
					pair) can be used. In plenum areas, U.S. part  
					AK3791 (one pair) or U.S. part AK3792 (two pair)  
					can be used.  
					Unswitched 24 Vac power wiring can be run in the  
					same conduit as the E-Bus cable.  
					Do not bundle output wires with sensor, digital  
					1
					EARTH  
					GROUND  
					—
					—
					—
					1
					input or communications E-Bus wires.  
					Do not use different wire types or gauges on the  
					same E-Bus segment. The step change in line  
					impedance characteristics would cause unpre-  
					dictable reflections on the E-Bus. When using dif-  
					ferent types is unavoidable, use a Q7751A Router  
					at the junction.  
					In noisy (high EMI) environments, avoid wire runs  
					parallel to noisy power cables, motor control cen-  
					ters, or lines containing lighting dimmer switches,  
					and keep at least 3 in. (76 mm) of separation  
					between noisy lines and the E-Bus cable.  
					Each daisy-chained E-Bus segment that is on one  
					side of a Q7751A,B Router (can contain up to 60  
					Excel 10s) and has a length greater than 1640 ft.  
					(500m) must have two E-Bus 209541B  
					Termination Modules, one at each end of the  
					daisy-chain wiring run.  
					EARTH  
					GROUND  
					IF THE W7750 CONTROLLER IS USED IN UL 1995 EQUIPMENT AND THE  
					PRIMARY POWER IS MORE THAN 150 VOLTS, GROUND ONE SIDE OF  
					TRANSFORMER SECONDARY.  
					1
					M12680  
					Fig. 6. Transformer power wiring details for one Excel 10  
					used in UL 1995 equipment (U.S. only).  
					—
					—
					Communications  
					Refer to E-Bus Wiring Guidelines, form 74-2865, for a  
					complete description of E-Bus network topology rules.  
					Approved cable types for E-Bus communications wiring are  
					2
					Level IV 22 AWG (0.34 mm ) plenum and non-plenum rated  
					unshielded, twisted pair, solid conductor wire. For nonplenum  
					areas, U.S. part AK3781 (one pair) or U.S. part AK3782 (two  
					pair) can be used. In plenum areas, U.S. part AK3791 (one  
					pair) or U.S. part AK3792 (two pair) can be used.  
					Communications wiring can be run in a conduit, if needed,  
					with non-switched 24 Vac or sensor wiring. If a longer E-Bus  
					network is required, a Q7740A 2-way or Q7740B 4-way  
					repeater can be added to extend the length of the E-Bus. Also  
					a Q7751A Router can be added to partition the system into  
					two segments and effectively double the length of the E-Bus.  
					Only one router is allowed with each Excel 10 Zone Manager,  
					and each network segment can have a maximum of one  
					repeater.  
					—
					Make sure that neither of the E-Bus wires is  
					grounded.  
					NOTE: If a 209541B Termination Module is required at a the  
					UV controller, connect two of the three termination  
					module wires to the E-Bus terminals. Selecting the  
					appropriate two wires depends on the E-Bus network  
					topology. Refer to the E-Bus Wiring Guidelines, form  
					74-2865, and the Excel 10 FTT Termination Module  
					Installation Instructions, form 95-7554. For example,  
					using a doubly terminated daisy-chained bus topol-  
					ogy, if controllers are on either end of an E-Bus wire  
					run, mount the termination module on the appropri-  
					ate terminals as shown in Fig. 7.  
					Pull the cable to each device on the E-Bus and connect to  
					communication terminals 14 and 15 (W7753A).  
					95-7520—02  
					4
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