Bryant 604D--A Sequence of Operation, Checking and Adjusting Refrigerant Charge

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604D--A Sequence of Operation

a. CONTINUOUS FAN

(1.) Thermostat closes circuit R to G energizing the blower motor for continuous fan.

b. COOLING MODE

(1.) If indoor temperature is above temperature set point, thermostat closes circuits R to G, R to Y and

Rto O-The unit delivers cooling airflow.

c.ELECTRIC HEATING MODE

(1.) Thermostat closes circuit R to W/W1, or W2 and R to G. There are no on or off delays.

d.HEAT PUMP HEATING MODE

(1.) Thermostat closes circuits R to G and R to Y. The compressor, indoor and outdoor fans are energized.

e.HEAT PUMP HEATING WITH AUXILIARY ELECTRIC HEAT

(1.) Thermostat closes circuits R to G, R to Y and R to W/W1 or W2. The compressor, indoor and outdoor fans are energized, as well as the electric heat relays.

f.DEFROST MODE

The defrost mode is automatically energized by the defrost board during heating mode. The defrost board energizes “O” (reversing valve) and “W2” (electric heat). It also de-energizes the outdoor fan. When defrost is complete, unit will return to heating mode. If room thermostat is satisfied during defrost, unit will shut down and restart in defrost on next call for heat.

Checking and Adjusting Refrigerant Charge

The refrigerant system is fully charged with Puron (R-410A) refrigerant and is tested and factory sealed.

NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper Puron (R-410A) charge.

A subcooling charging chart is attached to the inside of the compressor access panel (see Fig. 20). The chart includes the required liquid line temperature at given discharge line pressures and outdoor ambient temperatures.

An accurate thermocouple- or thermistor-type thermometer, and a gauge manifold are required when using the subcooling charging method for evaluating the unit charge. Do not use mercury or small dial-type thermometers because they are not adequate for this type of measurement.

NOTE: Allow system to operate for a minimum of 15 minutes before checking or adjusting refrigerant charge.

IMPORTANT: When evaluating the refrigerant charge, an indicated adjustment to the specified factory charge must always be very minimal. If a substantial adjustment is indicated, an abnormal condition exists somewhere in the cooling system, such as insufficient airflow across either coil or both coils.

Proceed as follows:

1.Remove caps from low- and high-pressure service fittings.

2.Using hoses with valve core depressors, attach low- and high-pressure gauge hoses to low- and high-pressure service fittings, respectively.

3.Start unit and let run until system pressures stabilize.

4.Measure and record the following:

a.Outdoor ambient-air temperature (°F [°C] db).

b.Liquid line temperature (°F [°C]) at TXV.

c.Discharge (high-side) pressure (psig).

d.Suction (low-side) pressure (psig) (for reference only).

5.Using Cooling Charging Charts compare outdoor-air temperature (°F [°C] db) with the discharge line pressure

(psig) to determine desired system operating liquid line temperature (See Fig. 17).

6.Compare actual liquid line temperature with desired liquid line temperature. Using a tolerance of ±2°F (±1.1°C), add refrigerant if actual temperature is more than 2°F (1.1°C) higher than proper liquid line temperature, or remove refrigerant if actual temperature is more than 2°F (1.1°C) lower than required liquid line temperature.

NOTE: If the problem causing the inaccurate readings is a refrigerant leak, refer to Check for Refrigerant Leaks section.

Indoor Airflow and Airflow Adjustments

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in unit damage.

For cooling operation, the recommended airflow is 350 to 450 cfm for each 12,000 Btuh of rated cooling capacity. For heating operation, the airflow must produce a temperature rise that falls within the range stamped on the unit rating plate.

NOTE: Be sure that all supply-and return-air grilles are open, free from obstructions, and adjusted properly.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Disconnect electrical power to the unit and install lockout tag before changing blower speed.

This unit has independent fan speeds for gas heating and cooling. In addition, this unit has the field-selectable capability to run two different cooling fan speeds: A normal cooling fan speed (350~400 CFM/Ton) and an enhanced dehumidification fan speed (As low as 320 CFM/Ton) for use with either a dehumidistat or a thermostat that supports dehumidification.

The cooling speed is marked “LOW” on the interface fan board (IFB) (See. Fig. 15) . The factory-shipped settings are noted in Table 4. There are 4 additional speed tap wires available for use in either electric heating or cooling (For color coding on the indoor fan motor leads, see Table 3). The additional 4 speed tap wires are shipped loose with vinyl caps and are located in the control box, near the interface fan board (IFB) (See Fig. 15).

Single Cooling Fan Speed Set-up (Dehumidification feature not used)

To change cooling speed:

1.Remove the vinyl cap off of the desired speed tap wire (Refer to Table 3 for color coding). Add the wet coil pressure drop in Table 5 to the system static to determine the correct cooling airflow speed in Table 4 that will deliver the nominal cooling airflow as listed in Table 1 for each size.

2.Remove the current speed tap wire from the “LOW” terminal on the interface fan board (IFB) (See Fig. 15) and place vinyl cap over the connector on the wire.

3.Connect the desired speed tap wire to the “LOW” terminal on the interface fan board (IFB).

NOTE: If accessory electric heat is installed, and the electric heat fan speed is chosen to be the same as the normal cooling fan speed, the dry airflow must meet or exceed the minimum airflow speed specified in Table 2 for the specific size unit.

604D-- -- A

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Contents Safety Considerations Table of ContentsProvide Unit Support Receiving and InstallationIntroduction Check EquipmentUnit Falling Hazard Rig and Place UnitProperty Damage Hazard 604D--A24-36 Unit Dimensions 604D--A42-60 Unit Dimensions CPRFCURB013A00 SizeCPRFCURB010A00 CPRFCURB012A00Corner Weights Small Cabinet Corner Weights Large Cabinet Select and Install DuctworkRigging/Lifting of Unit See Fig Personal Injury and Electrical Operation Hazard Supply and Return Duct OpeningsUnit Component Damage Hazard Install Electrical ConnectionsProvide for Condensate Disposal High-Voltage ConnectionsStandard Connections Special Procedures for 208-V OperationAccessory Electric Heaters Installation Control Voltage ConnectionsMinimum Airflow for Reliable Electric Heater Operation CFM Physical Data Unit 604D--A604D a Cont. Ladder Wiring Schematics 208/230-1-60 Connection Wiring Schematics 208/230-3-60 Cont. Ladder Wiring Schematics 208/230-3-60 Connection Wiring Diagram Cont. Ladder Wiring Diagram Checking Cooling and Heating Control Operation Start-Up AdjustmentsSTART-UP Check for Refrigerant LeaksUnit Operation Hazard Checking and Adjusting Refrigerant ChargeIndoor Airflow and Airflow Adjustments 604D--A Sequence of OperationColor Coding for Indoor Fan Motor Leads Two Cooling Fan Speeds Set-up Dehumidification feature usedSingle Speed Cooling With Higher Electric Heat Speed Continuous Fan OperationTypical Heat Pump Operation, Cooling Mode Defrost Control MaintenanceAir Filter Outdoor Fan Outdoor Coil, Indoor Coil, and Condensate Drain Pan604D--A Wet Coil Pressure Drop IN. W.C A24-60 Series aFilter Pressure Drop Table IN. W.C Cooling Charging Table-Subcooling Refrigerant Circuit Electrical Controls and WiringCopeland Scroll Compressor Puron Refrigerant Pressure SwitchesLoss of Charge Switch High-Pressure SwitchSTART-UP Checklist TroubleshootingSystem Information Puronr R-410A Quick Reference Guide Symptom Cause Remedy Troubleshooting ChartIII. START-UP Electrical Supply Voltage Compressor Amps TemperaturesRemove and Store in Job Files Preliminary Information Model noSmall Chassis Vertical Economizer Factory Installed Option GeneralAccessories InstallationPart Number Filter Part NumberHood Divider Removed Economizer Hood Assembly Horizontal Return Duct Cover Panel and Hood Divider Removal Large ChassisLeft Hood Side Hood Assembly Economizer Standard Sensors ConfigurationSupply AIR Temperature SAT SENSOR-The supply Temperature11.7C 12.8C 14.4C 17.2C 20C 22.8C 25.6C Economizer Controller 604D-- -- a Economizer Wiring Diagram A10200 Cont. Ladder Wiring Diagram A10199 604D-- -- a 604D-- -- a CO2 Sensor Standard Settings Economizer Input/Output Logic CO2 Sensor Standard SettingsOperation Troubleshooting 604D--A 30-36 3 Phase with Economizer 604D--A 42-60 3 Phase with Economizer

604D--A specifications

The Bryant 604D--A is a remarkable heating and cooling unit designed for both efficiency and performance, making it an ideal choice for homeowners seeking optimal climate control solutions. Its impressive array of features, technologies, and characteristics sets it apart in the HVAC market.

One of the standout features of the Bryant 604D--A is its advanced two-stage cooling system. This design allows the unit to adjust its cooling output based on the current temperature and humidity levels, which ensures a comfortable indoor environment while optimizing energy consumption. This two-stage operation is particularly beneficial during transitional seasons when temperatures fluctuate, providing a quieter operation and increased efficiency.

The Bryant 604D--A incorporates high-efficiency compressor technology that maximizes cooling capability while minimizing energy usage. This energy-efficient operation is further enhanced by its excellent SEER (Seasonal Energy Efficiency Ratio) rating. By achieving a high SEER rating, the 604D--A not only promotes energy savings but also contributes to lower utility bills, making it an economically sound investment for homeowners.

Another key characteristic of the Bryant 604D--A is its durable construction. Built with quality materials, this unit is designed to withstand varying weather conditions, ensuring longevity and reliable performance over the years. Its robust design also minimizes vibrations and noise, making it a quieter option compared to many competing systems.

Smart technology integration is also a significant highlight of the Bryant 604D--A. It features wireless connectivity, allowing users to control their heating and cooling settings remotely through a smartphone app. This modern convenience enables homeowners to adjust their indoor climate on-the-go, enhancing user comfort and convenience.

Additionally, the Bryant 604D--A is equipped with an advanced filtration system that helps to improve indoor air quality. By capturing dust, pollen, and other particles, this filtration system ensures that the air circulating within the home remains clean and healthy.

In conclusion, the Bryant 604D--A is a high-performance HVAC unit that excels in energy efficiency, durability, and convenience. With its advanced technology, quiet operation, and user-friendly features, it stands as a premier choice for those looking to elevate their home comfort while maintaining cost-effectiveness and sustainability. Whether for new installations or as a replacement for an outdated system, the Bryant 604D--A is undoubtedly a leader in modern climate control solutions.
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