Bryant 340MAV Electrical Data, Direct Venting, II. COMBUSTION-AIR and Vent Piping, General

TABLE 4—ELECTRICAL DATA

UNIT	VOLTS—	OPERATING		MAX	UNIT	MIN	MAX WIRE	MAX FUSE
	HERTZ—	VOLTAGE RANGE		UNIT		WIRE	LENGTH	OR CKT BKR
SIZE					AMPACITY†
	PHASE	Max*	Min*	AMPS		GAGE	(FT)‡	AMPS**
024040	115—60—1	127	104	6.1	8.4	14	44	15
036040	115—60—1	127	104	7.3	10.0	14	37	15
024060	115—60—1	127	104	6.1	8.4	14	44	15
036060	115—60—1	127	104	7.1	9.8	14	38	15
048060	115—60—1	127	104	9.5	12.8	14	29	15
036080	115—60—1	127	104	7.6	10.4	14	36	15
048080	115—60—1	127	104	10.0	13.4	14	28	15
060080	115—60—1	127	104	14.1	18.4	12	31	20
048100	115—60—1	127	104	10.2	13.5	14	27	15
060100	115—60—1	127	104	14.8	19.3	12	30	20
060120	115—60—1	127	104	14.6	19.1	12	30	20
060140	115—60—1	127	104	14.3	18.8	12	30	20

* Permissible limits of voltage range at which unit will operate satisfactorily.

†Unit ampacity = 125 percent of largest operating component’s full load amps plus 100 percent of all other potential operating components’ (EAC, humi difier, etc.) full load amps.

‡Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop. ** Time-delay type is recommended.

NOTE: DO NOT connect furnace control HUM terminal to HUM (humidifier) terminal on Thermidistat™, Zone Controller or simi- lar device. See Thermidistat™, Zone Controller, thermostat, or controller manufacturer’s instructions for proper connection.

2. Humidifier (HUM)

A quick-connect terminal (HUM) and screw terminal (COM 24-v) are provided for 24-v humidifier connection. (See Fig. 30.) HUM terminal is energized with 24v (0.5-amp maxi- mum) when gas valve is energized.

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

DIRECT VENTING

The 340MAV Furnaces require a dedicated (one 340MAV furnace only) direct-vent system. In a direct-vent system, all air for combustion is taken directly from outdoor atmosphere, and all flue gases are discharged to outdoor atmosphere.

I.REMOVAL OF EXISTING FURNACES FROM COMMON VENT SYSTEMS

When an existing Category I furnace is removed or replaced, the original venting system may no longer be sized to properly vent the remaining attached appliances. An improperly sized Category I venting system could cause the formation of condensate in the furnace and vent, leakage of condensate and combustion products, spillage of combustion products into the living space, etc.

WARNING: CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1.Seal any unused openings in venting system.

2.Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1-2002/NFPA54-2002 or the CSA B149.1, Natural Gas and Propane Installation Code and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

3.As far as 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.

4.Close fireplace dampers.

5.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 are operating at maximum speed. Do not operate a summer exhaust fan.

6.Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously.

7.Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.

8.If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI Z223.1-2002/NFPA54-2002 and/or CSA B149.1, Natural Gas and Propane Installation Code.

9.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 dampers and any other gas-fired appliance to their previous conditions of use.

Vent system or vent connectors may need to be resized. For any other appliances when resizing vent systems or vent connectors, system or connector must be sized to approach minimum size as determined using appropriate table found in the NFGC or NSC-

NGPIC.

II. COMBUSTION-AIR AND VENT PIPING

A.General

Combustion-air and vent pipe, fittings, primers, and solvents must conform to American National Standards Institute (ANSI) stan- dards and American Society for Testing and Materials (ASTM) standards. See Table 6 for approved materials for use in the U.S.A.

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