Honeywell W7750A specifications Configure Controllers, Troubleshooting, Cabling

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

Table 11. Excel 10 W7750 Controller Ordering Information. (Continued)

Part Number	Product Description	Comments
ML6464A1009	Direct Coupled Actuator, 66 lb-in. torque,	—
	Series 60
ML6474A1008	Direct Coupled Actuator, 132 lb-in. torque,	—
	Series 60
ML6185A1000	Direct Coupled Actuator, 50 lb-in. spring return	Series 60
V5852A/V5862A	Two-way terminal unit water valve; 0.19, 0.29,	Use with M6410 Valve Actuator. Close-off rating
	0.47, 0.74, 1.2, and 1.9 Cv 1/2 in. npt (13 mm)	for 0.19 to 1.9 Cv is 65 psi; for 2.9 and 4.9, Cv is
	or 2.9 and 4.9 Cv 3/4 in. npt (19 mm)	45 psi. (Coefficient of volume or capacity index
		Cv = gallons per minute divided by the square
		root of the pressure drop across the valve.)
V5853A/V5863A	Three-way mixing terminal unit hot water valve;	Use with M6410 Valve Actuator. Close-off rating
	0.19, 0.29, 0.47, 0.74, 1.2, and 1.9 Cv 1/2 in.	for 0.19 to 0.74 Cv is 55 psi; 1.2 and 1.9 Cv is 22
	npt (13 mm) or 2.9 and 4.9 Cv 3/4 in. npt (19	psi; 2.9 and 4.9 Cv is 26 psi.
	mm)
R8242A	Contactor, 24 Vac coil, DPDT	—
AT72D, AT88A, AK3310, etc.	Transformers	—
EN 50 022	DIN rail 35 mm by 7.5 mm (1-3/8 in. by 5/16 in.)	Obtain locally: Each controller requires 5 in.
—	Two DIN rail adapters	Obtain locally: Part number TKAD, from Thomas
		and Betts, two for each controller.
	Cabling:
—	Serial Interface Cable, male DB-9 to female	Obtain locally from any computer hardware
	DB-9 or female DB-25.	vendor.
Honeywell	LONWORKS Bus (plenum): 22 AWG (0.34 mm2)	Level IV 140°F (60°C) rating
AK3791 (one twisted pair)	twisted pair solid conductor, nonshielded or
AK3792 (two twisted pairs)	Echelon approved cable.
Honeywell AK3781 (one	LONWORKS Bus (nonplenum): 22 AWG (0.34	Level IV 140°F (60°C) rating
twisted pair) AK3782 (two	mm2) twisted pair solid conductor, nonshielded
twisted pairs)	or Echelon approved cable.
Honeywell AK3725	Inputs: 18 AWG (1.0 mm2) five wire cable	Standard thermostat wire
	bundle
Honeywell AK3752 (typical or	Outputs/Power: 14 to 18 AWG (2.0 to 1.0 mm2)	NEC Class 2 140°F (60°C) rating
equivalent)
Honeywell AK3702 (typical or	18 AWG (1.0 mm2) twisted pair	Non-plenum
equivalent)
Honeywell AK3712 (typical or	16 AWG (1.3 mm2) twisted pair	Non-plenum
equivalent)
Honeywell AK3754 (typical or	14 AWG (2.0 mm2) two conductor	Non-plenum
equivalent)

Step 6. Configure Controllers

Excel E-Vision PC Software is used to configure W7750 Controllers to match their intended application. The E-Vision User Guide, form number 74-2588 provides details for operating the PC software.

W7750 Controllers are shipped from the factory with a default hardware configuration. On power-up, the controller configuration parameters are set to the default values listed in Table 20 in Appendix C. The controller can operate normally in this mode (if the equipment and wiring match the default setup), and given valid sensor inputs, the outputs are controlled appropriately to maintain space temperature at the default setpoint. The default I/O arrangement for the W7750A

is printed on the terminal labels. Also see the wiring details in Fig. 27 in Step 4, Prepare Wiring Diagrams. The labeled I/O terminals are defined in Table 10.

Step 7. Troubleshooting

Troubleshooting Excel 10 Controllers and Wall Modules

In addition to the following information, refer to the Installation Instructions and Checkout and Test manual for each product. Most products have a Checkout and Test section in their Installation Instructions manual. If not, look for a separate Checkout and Test manual. See the Applicable Literature section for form numbers.

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