Bryant 355CAV Super Dehumidify Mode, Continuous Blower Mode, Heat Pump, Component Test

Page 51

nace blower motor BLWM will drop the blower airflow to 86% of high-cooling airflow. High-cooling airflow is based on the A/C selection shown in Fig. 47.

3.Cooling off-delay– When the “call for cooling” is satis- fied and there is a demand for dehumidification, the cool- ing blower-off delay is decreased from 90 seconds to 5 seconds.

Super Dehumidify Mode

Super-Dehumidify mode can only be entered if the furnace control is in the Thermidistat mode and there is a demand for dehumidification. The cooling operation described in item 4. above also applies to operation with a Thermidistat. The exceptions are listed below:

1.Low cooling – When the R to Y1 circuit is closed, R to G circuit is open, and there is a demand for dehumidification, the furnace blower motor BLWM will drop the blower air- flow to 65% of low-cooling airflow for a maximum of 10 minutes each cooling cycle or until the R to G circuit closes or the demand for dehumidification is satisfied. Low-cooling airflow is the true on-board CF selection as shown in Fig. 47.

2.High cooling – When the R to Y/Y2 circuit is closed, R to G circuit is open, and there is a demand for dehumidifica- tion, the furnace blower motor BLWM will drop the blower airflow to 65% of high-cooling airflow for a max- imum of 10 minutes each cooling cycle or until the R to G circuit closes or the demand for dehumidification is satis- fied. High-cooling airflow is based on the A/C selection shown in Fig. 47.

3.Cooling off-delay– When the “call for cooling” is satis- fied and there is a demand for dehumidification, the cool- ing blower-off delay is decreased from 90 seconds to 5 seconds.

Continuous Blower Mode

When the R to G circuit is closed by the thermostat, the blower motor BLWM will operate at continuous blower airflow. Continuous blower airflow selection is initially based on the CF selection shown in Fig. 47. Factory default is shown in Fig. 47. Terminal EAC-1 is energized as long as the blower motor BLWM is energized.

During a call for heat, the furnace control CPU will transition the blower motor BLWM to continuous blower airflow, low-heat airflow, or the mid-range airflow, whichever is lowest. The blower motor BLWM will remain ON until the main burners ignite then shut OFF and remain OFF for the blower-ON delay (60 seconds in medium heat, and 35 seconds in high-heat), allowing the furnace heat exchangers to heat up more quickly, then restarts at the end of the blower-ON delay period at low-heat, medium-heat, or high-heat airflow respectively.

The blower motor BLWM will revert to continuous-blower airflow after the heating cycle is completed. In high-heat, the furnace control CPU will drop the blower motor BLWM to low-heat airflow during the selected blower-OFF delay period before transitioning to continuous-blower airflow.

When the thermostat “calls for low-cooling”, the blower motor BLWM will operate at low-cooling airflow. When the thermostat is satisfied, the blower motor BLWM will operate an additional

90seconds at low-cooling airflow before transitioning back to continuous-blower airflow.

When the thermostat “calls for high-cooling”, the blower motor BLWM will operate at high cooling airflow. When the thermostat is satisfied, the blower motor BLWM will operate an additional

90seconds at high-cooling airflow before transitioning back to continuous-blower airflow.

When the R to G circuit is opened, the blower motor BLWM will continue operating for an additional 5 seconds, if no other function requires blower motor BLWM operation.

Continuous Blower Speed Selection from Thermostat

To select different continuous-blower airflows from the room thermostat, momentarily turn off the FAN switch or push button on the room thermostat for 1-3 seconds after the blower motor BLWM is operating. The furnace control CPU will shift the continuous-blower airflow from the factory setting to the next highest CF selection airflow as shown in Fig. 47. Momentarily turning off the FAN switch again at the thermostat will shift the continuous-blower airflow up one more increment. If you repeat this procedure enough you will eventually shift the continuous blower airflow to the lowest CF selection as shown in Fig. 47. The selection can be changed as many times as desired and is stored in the memory to be automatically used following a power interruption.

Heat Pump

See Fig. 54-57 for thermostat connections. When installed with a heat pump, the furnace control automatically changes the timing sequence to avoid long blower off times during demand defrost cycles. Whenever W/W1 is energized along with Y1 or Y/Y2, the furnace control CPU will transition to or bring on the blower motor BLWM at cooling airflow, low-heat airflow, or the mid-range airflow, whichever is lowest. The blower motor BLWM will remain on until the main burners ignite then shut OFF and remain OFF for 25 seconds before coming back on at heating airflow. When the W/W1 input signal disappears, the furnace control begins a normal inducer post-purge period while changing the blower airflow. If Y/Y2 input is still energized the furnace control CPU will transition the blower motor BLWM airflow to cooling airflow. If Y/Y2 input signal disappears and the Y1 input is still energized the furnace control CPU will transition the blower motor BLWM to low-cooling airflow. If both the Y1 and Y/Y2 signals disappear at the same time, the blower motor BLWM will remain on at low-heat airflow for the selected blower-OFF delay period. At the end of the blower-OFF delay, the blower motor BLWM will shut OFF unless G is still energized, in which case the blower motor BLWM will operate at continuous blower airflow.

Component Test

The furnace features a component test system to help diagnose a system problem in the case of a component failure. To initiate the component test procedure, ensure that there are no thermostat inputs to the control and all time delays have expired. Turn on setup switch SW1-6. (See Fig. 33)

NOTE: The component test feature will not operate if the control is receiving any thermostat signals or until all time delays have expired.

The component test sequence is as follows:

1.The furnace control CPU turns the inducer motor IDM ON at medium speed and keeps it ON through step 3.

2.After waiting 15 seconds the furnace control CPU turns the hot surface igniter ON for 15 seconds, then OFF.

3.The furnace control CPU then turns the blower motor BLWM ON at mid-range airflow for 15 seconds, then OFF.

4.After shutting the blower motor BLWM OFF the furnace control CPU shuts the inducer motor IDM OFF.

NOTE: The EAC terminals are energized when the blower is operating.

After the component test is completed , 1 or more status codes (11, 25, 41, or 42) will flash. See Service Label on blower access panel or Service/Status Code Instructions for explanation of status codes.

NOTE: To repeat component test, turn setup switch SW1-6 to OFF and then back ON.

355CAV

51

Page 50 Page 52
Image 51
Page 50 Page 52
Contents Installation Instructions Required Notice for Massachusetts Installations Safety Considerations Table of ContentsEnvironmental Hazard Dimensions In. / mm355CAV Clearances to Combustibles Unit Damage Hazard Electrostatic Discharge ESD PrecautionsCodes and Standards IntroductionApplications Upflow ApplicationProperty Damage Hazard Condensate Trap Alternate Upflow Orientation Carbon Monoxide Poisoning HazardCondensate Trap Tubing Alternate Upflow Orientation Upper Inducer Housing Drain Connection Condensate Trap Field Drain AttachmentCondensate Trap Freeze Protection Condensate Trap Location Downflow ApplicationsHorizontal Left SUPPLY-AIR Discharge Applications Horizontal Left Tube ConfigurationCombustion AIR Intake Vent Property Damage Construct a Working PlatformUnit Operation Hazard Condenste Trap Field Drain Attachment Horizontal Right SUPPLY-AIR Discharge ApplicationsLocation Prohibit Installation on BackFire or Death Hazard Hazardous LocationsFIRE, EXPLOSION, Injury or Death Hazard Leveling Legs If Desired InstallationInstallation in Upflow or Downflow Applications Installation in Horizontal ApplicationsFurnace, Plenum, and Subbase Installed on a Angle AIR Ducts Fire Hazard FIRE, Carbon Monoxide and Poisoning HazardUnit MAY not Operate Fire or Explosion Hazard Gas PipingRemoving Bottom Closure Panel Electrical Shock Hazard WiringElectrical Shock and Fire Hazard Disconnect Switch and FurnaceAccessories Fire or Electrical Shock HazardRemoval of Existing Furnaces from Common Vent Systems Fire and Explosion Hazard AIR for Combustion and VentilationPipe Fittings Cement Description Marked on Primers Combustion-Air and Vent Pipe DiameterFurnace Control Direct Vent Termination Clearance Ventilated Combustion Air Vent Termination Clearance Vent Pipe Termination for Ventilated Combustion Air System Unit Corrosion Hazard Combustion AIR PipeCombustion Air Termination Ventilated Combustion Air Option Attachment of Combustion Air Intake Housing Plug FittingAttachment of Vent Pipe Vent PipeCombustion Air Termination-Direct Vent / 2-Pipe System Carbon Monoxide Poisoning Property Damage Hazard304.8mm minimum 76.2mm minimum Two-Pipe Termination Kit Direct Vent / 2-Pipe System Only Vent TerminationExtended Exposed Sidewall Pipes Vent Termination Kit Direct Vent / 2-Pipe System OnlyWinter Design Number of 90 Elbows Btuh Maximum Allowable Pipe Length Ft MDirect Vent 2-Pipe Only Personal Injury Hazard Condensate DrainMulti-venting and Vent Terminations ApplicationAdditional Setup Switches SW4 START-UP, Adjustment and Safety CheckAir Conditioning A/C Setup Switches Continuous Fan CF Setup SwitchesPrime Condensate Trap with Water Example of Setup Switch in Off PositionWiring Diagram Furnace Setup Switch Description Inducer Housing Drain TubePurge Gas Lines Sequence of OperationTwo-Stage Thermostat and Two-Stage Medium/High Heating Two-Stage Thermostat and Two-Stage Low / High HeatingThermidistat Mode Heat Pump Super Dehumidify ModeContinuous Blower Mode Continuous Blower Speed Selection from ThermostatStep-Modulating Furnace with Single-Speed Air Conditioning Furnace and Two-Speed Heat Pump Pump Furnace and Two-Speed Air ConditionerRedundant Automatic Gas Valve Set Gas Input RateBurner Orifice Altitude AVG. GAS 675 Burner Flame Altitude Derate Multiplier for USASet Temperature Rise Gas Rate cu Ft/HrSet Thermostat Heat Anticipator Check Primary Limit Control ChecklistCheck Safety Controls Check Pressure SwitchesCombustion and Vent Piping Checklist InstallationCatalog No. II355CAV---060---4
Related manuals
Manual 60 pages 10.1 Kb Manual 14 pages 23.93 Kb

355CAV specifications

The Bryant 355CAV is a state-of-the-art automated vertical machining center designed to enhance precision and efficiency in the manufacturing sector. Renowned for its robust construction, this machine is engineered to handle a broad spectrum of machining tasks, making it suitable for both small and large-scale production environments.

One of the standout features of the Bryant 355CAV is its advanced CNC control system, which provides users with exceptional ease of use. The intuitive user interface allows operators to program complex machining operations with minimal effort, significantly reducing setup times. The machine's high-speed spindle achieves impressive rotational speeds, which allows for quick material removal, ultimately optimizing productivity and throughput.

The Bryant 355CAV exhibits superior rigidity and stability due to its solid cast iron frame and carefully designed structural components. This construction minimizes vibrations during machining, ensuring that even the most intricate parts are produced with high accuracy. The machine's precision ground linear guideways further enhance its performance by providing smooth motion and high load capacity.

Equipped with a large work envelope, the Bryant 355CAV enables manufacturers to accommodate various part sizes and geometries. Additionally, its automatic tool changers can hold a variety of tools, thus facilitating quick transitions between different machining operations without requiring manual intervention. This flexibility is essential for meeting the diverse needs of modern manufacturing.

Another notable characteristic of the Bryant 355CAV is its energy-efficient design. It integrates modern technologies aimed at reducing power consumption while maintaining optimum performance. This environmentally conscious approach not only cuts operational costs but also aligns with the growing demand for sustainable manufacturing practices.

Moreover, the Bryant 355CAV features advanced monitoring capabilities, allowing operators to track machine performance in real time. Data analytics from these systems can be utilized to improve operational efficiency, reduce downtime, and enhance predictive maintenance protocols.

In summary, the Bryant 355CAV is a versatile, high-performance machining center that showcases cutting-edge features and technologies. Its combination of user-friendly controls, sturdy construction, energy efficiency, and advanced monitoring positions it as a vital asset for manufacturers aiming to elevate their productivity and precision in an increasingly competitive landscape.
Top Page Image Contents