Bryant 589A, 588A Checking and Adjusting Refrigerant Charge, Indoor Air¯ow and Air¯ow Adjustments

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B. Checking and Adjusting Refrigerant Charge

The refrigerant system is fully charged with R-22 refriger- ant, tested, and factory-sealed.

NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper R-22 charge.

A superheat charging label is attached to the inside of the compressor access door. The label includes a ``Superheat Charg- ing Table'' and a ``Required Suction-Tube (F) Temperature'' chart.

An accurate superheat, thermocouple-, or thermistor-type ther- mometer, a sling psychrometer, and a gage manifold are re- quired when using the superheat charging method for evalu- ating the unit charge. Do not use mercury or small dial-type thermometers because they are not adequate for this type of measurement.

CAUTION: When evaluating the refrigerant charge, an indicated adjustment to the speci®ed factory charge must always be very minimal. If a substantial adjust- ment is indicated, an abnormal condition exists some- where 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 ®ttings.

2.Using hoses with valve core depressors, attach low- and high-pressure gage hoses to low- and high-pressure serv- ice ®ttings, respectively.

3.Start unit in Cooling mode and let unit run until sys- tem pressures stabilize.

4.Measure and record the following:

a.Outdoor ambient-air temperature (F db).

b.Evaporator inlet-air temperature (F wb).

c.Suction-tube temperature (F) at low-side service ®tting.

d.Suction (low-side) pressure (psig).

5.Using ``Superheat Charging Table,'' compare outdoor- air temperature (F db) with evaporator inlet-air tem- perature (F wb) to determine desired system operating superheat temperature. See Tables 8A-8H and 9A-9F.

6.Using ``Required Suction-Tube Temperature (F)'' table, compare desired superheat temperature with suction (low- side) operating pressure (psig) to determine proper suction- tube temperature. See Table 10.

7.Compare actual suction-tube temperature with proper suction-tube temperature. Using a tolerance of ± 3° F, add refrigerant if actual temperature is more than 3° F higher than proper suction-tube temperature, or re- move refrigerant if actual temperature is more than 3° F lower than required suction-tube temperature.

NOTE: If the problem causing the inaccurate readings is a refrigerant leak, refer to Check for Refrigerant Leaks section on page 23.

C. Indoor Air¯ow and Air¯ow Adjustments

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

Table 6 shows the temperature rise at various air¯ow rates. Tables 11-14 show both heating and cooling air¯ows at vari- ous external static pressures. See Tables 15 and 16 for ICM (Integrated Control Motor) units air delivery. Refer to these tables to determine the air¯ow for the system being in- stalled. See Table 17 for wet coil pressure drop.

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

WARNING: Shut off gas supply then disconnect elec- trical power to the unit before changing blower speed. Electrical shock can cause personal injury or death.

Air¯ow can be changed by changing the lead connections of the blower motor.

Unit 588A two- or 3-speed motors (except size 030) are fac- tory wired for low speed operation. Unit 588A030 is factory wired for medium speed. Units 589A024,036, and 048 (460 v) two- or 3-speed motors are factory wired for low speed; units 589A030 and 042 are factory wired for medium speed.

For 208/230-v and A.O. Smith 460-v Blower Motors

The motor leads are color-coded as follows:

 

3-SPEED

2-SPEED

black =

high speed

black = high speed

blue

=

medium speed

red = low speed

red

= low speed

 

To change the speed of the blower motor, remove the fan mo- tor speed leg lead from the blower relay (BR). This wire is attached to terminal BM for single-phase and 3-phase units. To change the speed, remove and replace with lead for de- sired blower motor speed. Insulate the removed lead to avoid contact with chassis parts.

For 460-v GE Motors

The motor leads are color coded as follows:

3-SPEED

2-SPEED

black

= high

black = high

blue

=

jumper

blue

=

jumper

orange = medium

red

=

low

red

= low

 

 

 

To change the speed of the blower motor, remove fan motor speed lead from the blower relay (BR) and replace with the lead for the desired blower motor speed. The motor speed lead is attached to terminal BM. Insulate removed lead end to avoid contact with chassis parts. On 3-speed motors only, connect orange lead to terminal BM of BR. To select high speed on 460-v GE motors, separate the black (female QC) from the blue lead (male QC) and connect the black lead to the BR. Insulate the blue lead to avoid contact with any chassis parts.

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Contents General ContentsSafety Considerations Ð2Ð 588A018-042 Without Base Rail, Unit DimensionsÐ3Ð 588A018-042 With Optional Base Rail, Unit DimensionsÐ4Ð 588A048,060 Without Base Rail, Unit DimensionsÐ5Ð 588A048,060 With Optional Base Rail, Unit DimensionsÐ6Ð 589A024-036 Without Base Rail, Unit DimensionsÐ7Ð 589A024-036 With Optional Base Rail, Unit DimensionsÐ8Ð 589A042-060 Without Base Rail, Unit DimensionsÐ9Ð 589A042-060 With Optional Base Rail, Unit DimensionsIV. Ð Provide Clearances Receiving and Installation Check EquipmentII. Ð Provide Unit Support III. Ð Field Fabricate DuctworkCurb Ð11ÐPart Number Unit WeightUnit MAX VI. Ð Connect Condensate Drain VII. Ð Install Flue HoodVIII. Ð Install GAS Piping Units With Optional Base RailÐ14Ð Physical Data Ð Unit 588AÐ15Ð Physical Data Ð Unit 589AConguring Units for Down¯ow Vertical Discharge IX. Ð Install Duct ConnectionsInternal Length of PIPE, FT² Iron Pipe Diameter Size Maximum Gas Flow CapacityÐ17Ð High-Voltage Connections Install Electrical ConnectionsÐ19Ð Ð Electrical Data Ð Unit 588ARLA LRA FLA Ð Electrical Data Ð Unit 589AÐ20Ð High- and Control-Voltage Connections Special Procedures for 208-V OperationPRE-START-UP Transformer ProtectionCheck Heating Control II. Start UP Heating Section and Make AdjustmentsAdjust Gas Input START-UP Check for Refrigerant LeaksOrifices Rated Gas Inputs at Indicated Manifold PressuresGAS Supply Pressure Manifold Natural GAS Propane Number PressureÐ25Ð Heating Temperature Rise F InputCheck Burner Flame III. Start UP Cooling Section and Make Adjustments Ð27Ð 208/230-1-60 Wiring Diagram, Units 588A018-060Ð28Ð 208/230-3-60 Wiring Diagram, Units 588A030-060Ð29Ð 460-3-60 Wiring Diagram, Units 588A036-060Ð30Ð 208/230-1-60 Wiring Diagram, Units 589A024-042Ð31Ð 208/230-1-60 Wiring Diagram, Units 589A048,060Ð32Ð 208/230-3-60 Wiring Diagram, Units 589A036-042Ð33Ð 208/230-3-60 Wiring Diagram, Units 589A048,060Ð34Ð 460-3-60 Wiring Diagram, Units 589A036-048Speed Checking and Adjusting Refrigerant ChargeIndoor Air¯ow and Air¯ow Adjustments Ð36Ð Ð Superheat Charging Table, 588A018Ð Superheat Charging Table, 588A024 Ð37Ð Ð Superheat Charging Table, 588A030Ð Superheat Charging Table, 588A036 Ð Superheat Charging Table, 588A042Ð38Ð Ð Superheat Charging Table, 588A060Ð39Ð Ð Superheat Charging Table, 589A024Ð Superheat Charging Table, 589A030 Ð Superheat Charging Table, 589A036Ð40Ð Ð Superheat Charging Table, 589A042Ð Superheat Charging Table, 589A048 Ð Superheat Charging Table, 589A060Ð41Ð Required Suction-Tube Temperature FÐ42Ð Unit 589A Ð43ÐUnit Size Airflow Pressure Drop MaintenanceWet Coil Pressure Drop Cooling Sequence of OperationIV. Flue GAS Passageways AIR FilterII. Unit TOP Removal III. Evaporator Blower and MotorVIII. Main Burners VI. Limit SwitchCOMBUSTION-AIR Blower VII. Burner IgnitionXIII. GAS Input XI. Electrical Controls and WiringCondenser FAN XII. Refrigerant CircuitSymptom Cause Remedy TroubleshootingMotor IFM runs when itPoor ¯ame characteristics Integrated controlLED OFF Service TrainingPage III. START-UP Electrical START-UP ChecklistTemperatures Preliminary Information
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589A, 588A specifications

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