Bryant 345MAV instruction manual II -V Wiring, III. Accessories, Venting

Page 22

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

Ð22Ð

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Contents Electrostatic Discharge ESD Precautions Ð1ÐÐ2Ð Dimensions→ ÐDimensional Drawing Unit SizeMinimum Inches Clearance to Combustible Construction Safety ConsiderationsElectrostatic Discharge ESD Precautions → ÐClearances to CombustiblesII. Upflow Applications IntroductionApplications General Condensate Trap Location Factory-Shipped OrientationÐ5Ð Condensate Trap Location Alternate Upflow OrientationÐ6Ð Pressure Switch TubingCondensate Trap Field Drain Attachment Condensate Trap Location Condensate Trap Freeze ProtectionIII. Downflow Applications Condensate Trap TubingIV. Horizontal Left SUPPLY-AIR Discharge Applications Ð8ÐConstruct a Working Platform Horizontal Right SUPPLY-AIR Discharge ApplicationsÐ9Ð ÐAttic Location and Working Platform Front Upflow or Downflow Horizontal II. Furnace Location Relative to Cooling Equipment II. Unconfined Space III. Hazardous LocationsAIR for Combustion and Ventilation General III. Confined SpaceCombustion AIR from Outdoors Through Vertical Ducts Installation Leveling Legs if DesiredCombustion AIR from Outdoors Through Horizontal Ducts Opening Dimensions II. Installation on a Concrete SlabFurnace Casing Width General Requirements IV. Installation in Horizontal ApplicationsAIR Ducts Ductwork acoustical treatmentÐfilter Information Return Air ConnectionsVI. Filter Arrangement VII. Bottom Closure PanelVIII. GAS Piping 171⁄2-IN. Wide Casings onlyElectrical Connections Ðmaximum Capacity of Pipe CU FT PER HRNominal Length of Pipe FT Iron Internal Diameter Size Ðelectrical Data WiringLength FT³ CKT BKR Amps Phase Amps SizeÐWiring Diagram Venting II -V WiringIII. Accessories Removal of Existing Furnaces from Common Vent SystemsGeneral II. COMBUSTION-AIR and Vent PipingCombustion Air Pipe ÐCombustion-Air Inlet Pipe Assembly 3001 to Ðmaximum Allowable Vent Pipe Length FT4001 to 5000² 6001 to 7000² Ðmaximum Allowable Vent Pipe Length FT5001 to 6000² 7001 to 8000²ÐShort Vent 5 to 8 Ft System 9001 to 10,000²Vent Extension Pipe 040 060 080 100 120Condensate Drain General III. Vent TerminationIV. Multiventing Ðvent Pipe Termination ClearancesÐRoof Termination Preferred III. Continuous Blower Mode Heating ModeII. Cooling Mode IV. Heat Pump ModeComponent Test Sequence START-UP Procedures GeneralComponent Test II. Prime Condensate Trap with WaterIII. Purge GAS Lines → ÐInducer Housing Drain TubeIV. Adjustments Set Gas Input RateBTU/CU FT Altitude5000 Only4001 Only 50018000 7001775 Only 8001Example Ðaltitude Derate Multiplier for U.S.AAltitude Derate Multiplier Factor for U.S.A Ðgas Rate CU FT/HR Set Temperature RiseBlower Off Delay Heat Mode ±SPEED SelectorII. Check Pressure Switch Check Safety Controls Check Primary Limit ControlChecklist Load Calculation ChecklistðinstallationCHECKLISTÐSTART-UP Vent Piping
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345MAV specifications

The Bryant 345MAV is a premier choice in the realm of residential heating and cooling systems, encapsulating advanced technologies, high efficiency, and remarkable performance. Designed for homeowners seeking reliability and comfort, this model exemplifies modern HVAC (Heating, Ventilation, and Air Conditioning) innovations.

One standout feature of the Bryant 345MAV is its impressive energy efficiency. With a high SEER (Seasonal Energy Efficiency Ratio) rating, it operates at peak levels while consuming less energy. This not only reduces utility bills but also supports environmental sustainability, making it an ideal selection for eco-conscious consumers. The model employs variable-speed technology, which allows the system to adjust its output based on current heating and cooling needs. As a result, it provides consistent indoor comfort while minimizing temperature fluctuations.

The Bryant 345MAV incorporates advanced refrigerant technologies designed for optimal performance. It uses R-410A refrigerant, which is known for its lower environmental impact compared to traditional refrigerants like R-22. This environmentally friendly aspect aligns with regulations aimed at reducing ozone depletion, thereby promoting a greener approach to heating and cooling.

Reliability is another hallmark of the Bryant 345MAV. Engineered with precision, this model features a durable build designed to withstand varying weather conditions. The system is equipped with a robust compressor that is engineered for longevity and minimal noise during operation. Homeowners will appreciate the quiet performance of the 345MAV, ensuring peace in their living spaces.

Comfort also extends to the user experience with the inclusion of a smart thermostat option. This integration allows homeowners to manage their heating and cooling systems remotely, enhancing convenience and control. Programmable settings can optimize energy use based on individual schedules, facilitating both comfort and savings.

In summary, the Bryant 345MAV is a top-tier solution for residential climate control, blending energy efficiency, innovative technology, and unmatched reliability. With its variable-speed operation, environmentally friendly refrigerant, and smart features, the 345MAV represents a significant advancement in the HVAC field. Homeowners investing in this model can expect a system that not only meets their heating and cooling needs but exceeds them in terms of efficiency and comfort.
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