Bryant 345MAV instruction manual II.24-VWIRING, Iii.Accessories, Venting, ÐControl Center

II.24-V WIRING

Make field 24-v thermostat connections at 24-v terminal block on control center. For proper cooling operation, Y wire from thermo- stat MUST be connected to Y terminal on control center, as shown in Fig. 24. The 24-v terminal board is marked for easy connection of field wiring. (See Fig. 26.) The 24-v circuit contains a 3-amp, automotive-type fuse located on control center. (See Fig. 27.) Any electrical shorts of 24-v wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (3 amp).

NOTE: Use AWG No. 18 color-coded copper thermostat wire for lengths up to 100 ft. For wire lengths over 100 ft, use AWG No. 16 wire.

III.ACCESSORIES

1.Electronic Air Cleaner (EAC)

Two quick-connect terminals marked EAC-1 and EAC-2 are provided for EAC connection. (See Fig. 27.) These terminals are energized with 115v (1.5-amp maximum) during blower motor operation.

2.Humidifier (HUM)

A quick-connect terminal (HUM) and screw terminal (COM) are provided for 24-v humidifier connection. (See Fig. 26.) HUM terminal is energized with 24v (0.5-amp maximum) after inducer motor prepurge period.

NOTE: A field-supplied, 115-v controlled relay connected to EAC terminals may be added if humidifier operation is desired during blower operation.

VENTING

The 345MAV Furnaces require a dedicated, (one 345MAV fur- nace only) sealed vent system. All air for combustion is taken from the area adjacent to furnace, and all flue products are discharged to outside atmosphere.

TEST/TWIN

I.REMOVAL OF EXISTING FURNACES FROM COMMON VENT SYSTEMS

If furnace being replaced was connected to a common vent system with other appliances, the following steps shall be followed with each appliance connected to the venting system placed in opera- tion, while any other appliances connected to the venting system are not in operation:

1.Seal any unused openings in the venting system.

2.Inspect the venting system for proper size and horizontal pitch as required in the National Fuel Gas Code, ANSI Z223.1 or the CAN/CGA B149 Installation Codes and these instructions. Determine that there is no blockage or restric- tion, leakage, corrosion, and other deficiencies which could cause an unsafe condition.

3.In so far as is practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

4.Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so appliance shall operate continuously.

5.Test for draft hood equipped appliance spillage at the draft hood relief opening after 5 minutes of main burner opera- tion. Use the flame of a match or candle.

6.After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace damp- ers, and any other gas-burning appliance to their previous conditions of use.

G	24-V THERMOSTAT
	TERMINALS
R
Y
W	HUMIDIFIER TERMINAL
COM 24V
	(24-VAC 0.5 AMP MAX)
HUM	LED OPERATION &
	DIAGNOSTIC LIGHT

	HARNESS CONNECTOR
SEC-1	24-V TRANSFORMER SEC-2
3-AMP FUSE	SPARE-1
COOL
	BLOWER SPEED
HEAT
	SELECTION TERMINALS
	SPARE-2
	EAC-1
	EAC-ELECTRONIC AIR CLEANER
	TERMINALS (115-VAC 1.5 AMP MAX)
115-VAC (L1)	EAC-2
POWER SUPPLY	115-VAC (L2) NEUTRAL
	CONNECTION
HOT SURFACE	INDUCER MOTOR
IGNITOR CONNECTOR	CONNECTOR

A95086

Fig. 27ÐControl Center

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