Bryant 340MAV II. Cooling Mode, III. Continuous Blower Mode, IV. Heat Pump Mode, Component Test

Page 32

6.Blower off delayÐWhen thermostat is satisfied, circuit between R-W is opened, de-energizing gas valve (stopping gas flow to burners) and humidifier. Blower motor and electronic air cleaner remain energized for 135 sec.

7. Post purgeÐInducer motor remains energized 15 sec after burners are extinguished (5 sec if jumper has been cut for 140 size unit in downflow orientation).

II.COOLING MODE

When thermostat calls for cooling, R-G and R-Y circuits close. R-Y circuit starts outdoor condensing unit, and combined R-Y and R-G circuit starts furnace blower motor on cooling speed. Elec- tronic air cleaner EAC-1 terminal is energized with 115v whenever blower is operating.

When thermostat is satisfied, R-G and R-Y circuits are opened, furnace blower continues operating on cooling speed for an additional 90 sec.

III.CONTINUOUS BLOWER MODE

When R-G circuit is made, blower motor operates on heating speed.

NOTE: Electronic air cleaner EAC-1 terminal is energized with 115v whenever blower is operating.

If a call for heat (R-W) occurs while thermostat is in continuous blower mode, blower stops to allow furnace heat exchangers to heat up more quickly, then restarts at end of blower on delay period of 60 sec (40 sec if jumper has been cut for 140 size unit in downflow orientation).

Blower reverts to continuous operation after heating cycle is completed.

If a call for cooling (R-Y) occurs while thermostat is in continuous blower mode, blower changes from continuous blower speed (heating speed) to cooling speed.

When thermostat cooling call is satisfied, R-Y opens and blower operates an additional 90 sec at cooling speed before reverting back to continuous operation (heating speed).

IV. HEAT PUMP MODE

When installed with a heat pump, furnace control automatically changes blower on delay timing sequence to avoid no blower operation time during demand defrost cycles. When R-W and R-Y or R-W, R-Y, and R-G thermostat inputs are received at the same time at furnace control center, control starts blower in heating speed. Then a gas heat mode begins. Blower remains operating at heating speed for 15 sec or until end of prepurge period, then blower shuts off until end of ignitor warm up and trial for ignition periods (a total of 24 sec). Blower restarts at heating speed.

When R-W thermostat call disappears, control completes inducer post-purge period of 15 sec (5 sec if jumper has been cut for 140 size unit in downflow orientation) and changes to cooling speed after a 2-sec delay.

If R-W, R-Y, and R-G thermostat signals should disappear simultaneously, blower remains on for heating blower off delay period of 135 sec, and the inducer goes through 15 sec post-purge period (5 sec if jumper has been cut for 140 size unit in downflow orientation). If R-W and R-Y thermostat signals should disappear, leaving R-G thermostat signal, blower remains on in heating speed and inducer remains on for 15 sec to complete post-purge period (5 sec if jumper has been cut for 140 size unit in downflow orientation).

Control initiates a 90-sec blower only on period before starting another heat pump cycle if there is a power interruption. Anytime control senses false flame, control locks out of heating mode. This reaction occurs because control ignores W input due to false flame signal and, as a result, sees only Y input and goes into cooling mode blower off delay. All other control functions remain in standard format.

Ð32Ð

NOTE: EAC-1 terminal is energized whenever blower operates. HUM terminal is only energized when gas valve is energized.

V.COMPONENT TEST

A. Component Test Sequence

NOTE: All components are functionally operated except the gas valve.

When component test is initiated, the following sequence of events occurs:

1.LED flashes a status code 4 times.

2.Inducer motor starts and continues to run for remainder of component test.

3.Hot surface ignitor is energized for 15 sec, then de- energized.

4.Main blower operates at cooling speed for 10 sec, then turns off.

5.Main blower operates at heating speed for 10 sec, then turns off.

6.Inducer motor stops.

Component test can be initiated by one of the following proce- dures.

B.Initiating Component Test By Removing Main Limit Switch Wire

NOTE: NO thermostat signal may be present at control center and all blower time delay off periods must be completed.

1.Leave 115-v power to furnace turned on.

2.Remove main furnace door.

3.Look into blower access panel sight glass for current LED status.

NOTE: Leave blower access panel installed to maintain power to control center to view current LED status.

4.BRIEFLY remove either wire from the main limit switch until the LED goes out, then reconnect it.

CAUTION: Make sure limit switch wire does not con- tact any metallic component such as the gas valve. If wire is shorted, 3-amp fuse on control center will blow.

NOTE: If wire to main limit is disconnected longer than 4 sec, the control senses limit circuit is open. Main blower will start, and status code retrieval request will be ignored.

5.When above items have been completed, the component test sequence will occur as described in the Component Test Sequence section above.

NOTE: Be sure to record the status code which is flashed 4 times at start of component test for further troubleshooting.

6.After component test is completed and LED is ON continu- ously indicating the furnace is ready to operate when a signal from the thermostat is received, replace main furnace door.

C.Initiating Component Test By Jumpering Control TEST Terminal

1.Remove main furnace door.

2.Remove blower access panel.

3.Manually close blower access panel door switch. Use a piece of tape to hold switch closed.

Image 32
Contents Ð1Ð ÐMultipoise OrientationsUnit Size DimensionsÐ2Ð Safety Considerations Electrostatic Discharge ESD PrecautionsMinimum Inches Clearance to Combustible Construction → ÐClearances to CombustiblesIntroduction Applications GeneralII. Upflow Applications Condensate Trap Location Factory-Shipped OrientationÐ5Ð Condensate Trap Location Alternate Upflow OrientationPressure Switch Tubing Ð6ÐCondensate Trap Freeze Protection III Downflow ApplicationsCondensate Trap Location Condensate Trap TubingIV. Horizontal Left SUPPLY-AIR Discharge Applications Ð8ÐHorizontal Right SUPPLY-AIR Discharge Applications Ð9ÐConstruct a Working Platform ÐAttic Location and Working Platform → ÐHorizontal Right Tube Configuration LocationII. Furnace Location Relative to Cooling Equipment III. Hazardous LocationsInstallation Leveling Legs if Desired → II. Installation in Upflow or Downflow ApplicationsWidth Ðopening DimensionsFurnace Plenum Opening Floor Opening Casing III. Installation in Horizontal Applications ÐDuct FlangesBottom Closure Panel IV. Filter ArrangementÐfilter Information Wiring VI. GAS PipingÐmaximum Capacity of Pipe Electrical Connections→ ÐHeating and Cooling Application Wiring Diagram II -V WiringÐWiring Diagram III. Accessories Ðelectrical DataAmps Gage AmpsDirect Venting Removal of Existing Furnaces from Common Vent SystemsII. COMBUSTION-AIR and Vent Piping GeneralCombustion-Air and Vent Pipe Attachment Combustion-Air and Vent Pipe DiameterExample COMBUSTION-AIR Intake Housing Plug Fitting ÐShort Vent 5 to 8 Ft SystemÐmaximum Allowable Pipe Length FT 2001 toÐmaximum Allowable Pipe Length FT 4001 to 5000³Vent Extension Pipe 8001 to 9000³Extended Exposed Sidewall Pipes Two-Pipe Termination KitÐRoof Termination Preferred Concentric Vent/Air Termination Kit IV. Multiventing and Vent TerminationsCondensate Drain General II. ApplicationÐConcentric Vent and Combustion-Air III. Condensate Drain Protection Heating ModeSequence of Operation II. Cooling Mode III. Continuous Blower ModeIV. Heat Pump Mode Component TestSTART-UP Procedures General II. Prime Condensate Trap with WaterSet Gas Input Rate IV. AdjustmentsIII. Purge GAS Lines BTU/CU FT Ð36Ð Ð37Ð Ð38Ð Ð39Ð Set Temperature Rise United StatesÐaltitude Derate Multiplier for U.S.A CanadaCheck Safety Controls Check Primary Limit Control II. Check Pressure SwitchChecklist Ðspeed SelectorChecklistðinstallation CHECKLISTÐSTART-UPLoad Calculation Combustion and Vent PipingÐ43Ð Service Training
Related manuals
Manual 12 pages 2.16 Kb Manual 48 pages 30.25 Kb

340MAV specifications

The Bryant 340MAV is a standout model in the Bryant lineup, designed to provide exceptional comfort, efficiency, and performance for residential heating and cooling needs. This unit offers a perfect blend of innovative technology and user-friendly features, making it an ideal choice for homeowners seeking reliability and quality.

One of the defining characteristics of the Bryant 340MAV is its impressive efficiency rating. With a SEER (Seasonal Energy Efficiency Ratio) of up to 18, this model ensures that homeowners can enjoy effective cooling during the summer months while minimizing energy consumption. Similarly, the heating efficiency is notable, with a high AFUE (Annual Fuel Utilization Efficiency) rating. This makes the 340MAV an environmentally friendly option that also promotes cost savings on energy bills.

The 340MAV incorporates advanced technologies that enhance its performance. One such technology is the variable-speed compressor, which allows the system to adjust its output based on the demands of the home. This means that the unit operates more quietly and reduces energy usage by matching the cooling or heating output required. Additionally, the two-stage heating capability provides more consistent temperatures and improved comfort throughout the space.

Operating noise is a crucial factor in residential HVAC systems, and the Bryant 340MAV is designed with this in mind. Engineered for quiet operation, the unit features a sound-dampening design, including an insulated cabinet and a specially designed compressor that minimizes noise levels. Homeowners can enjoy a comfortable indoor climate without the disruptive racket often associated with traditional systems.

Furthermore, the Bryant 340MAV is equipped with a durable all-aluminum coil, which improves heat transfer efficiency while also being resistant to corrosion. This characteristic contributes to the longevity of the unit, ensuring that it can withstand various environmental factors without compromising performance.

Another key feature is the advanced control options that the Bryant 340MAV offers. Integration with smart thermostats allows homeowners to monitor and adjust their HVAC system remotely, ensuring optimal comfort at all times. Additionally, the system is compatible with Bryant's Perfect Airâ„¢ filtration system, enhancing indoor air quality by reducing pollutants and allergens.

In summary, the Bryant 340MAV is a high-efficiency heating and cooling solution that brings together cutting-edge technology, quiet operation, and user-friendly features. With its focus on comfort and energy savings, it stands out as a prime choice for homeowners looking to invest in a reliable HVAC system.