Bryant 588A, 589A user manual III. Start UP Cooling Section and Make Adjustments

Page 26

F. Heating Sequence of Operation

See Fig. 26-33 and unit wiring label.

On a call for heating, terminal ``W'' of the thermostat is en- ergized, starting the induced-draft motor. When the hall- effect sensor on the induced-draft motor senses that it has reached the required speed, the burner sequence begins. This function is performed by the integrated gas control (IGC). The evaporator-fan motor is energized 45 seconds after ¯ame is established. When the thermostat is satis®ed and ``W'' is deen- ergized, the burners stop ®ring and the evaporator-fan motor shuts off after a 45-second time-off delay.

A LED (light-emitting diode) indicator is provided on the con- trol board to monitor operation. The control board is located by removing the burner access panel. During normal opera- tion, the LED is continuously on. See Table 7 for error codes.

Table 7 Ð LED Indications

ERROR CODE

LED INDICATION

Normal Operation

On

Hardware Failure

Off

Fan On/Off Delay Modi®ed

1 Flash

Limit Switch Fault

2 Flashes

Flame Sense Fault

3 Flashes

Four Consecutive Limit Switch Faults

4 Flashes

Ignition Lockout Fault

5 Flashes

Induced-Draft Motor Fault

6 Flashes

Rollout Switch Fault

7 Flashes

Internal Control Fault

8 Flashes

 

 

NOTES:

1.There is a 3-second pause between error code displays.

2.If more than one error code exists, all applicable error codes will be displayed in numerical sequence.

3.This chart is on the wiring diagram located inside the burner access panel.

G. Limit Switches

Normally-closed limit switch (LS) completes the control cir- cuit through the thermostat R circuit. Should the leaving-air temperature rise above the maximum allowable tempera- ture, the limit switch opens and the R control circuit ``breaks.'' Any interruption in the R control circuit instantly closes the gas valve and stops gas ¯ow to the burners and pilot. The blower motor continues to run until LS resets.

When the air temperature at the limit switch drops to the low-temperature setting of the limit switch, the switch closes and completes the R control circuit. The electric-spark igni- tion system cycles and the unit returns to normal heating operation.

H. Auxiliary Limit Switch Ð Rollout

The function of the switch is to close the main gas valve in the event of ¯ame rollout. The switch is located above the main burners. When the temperature at the auxiliary switch reaches the maximum allowable temperature, the R control circuit trips, closing the gas valve and stopping gas ¯ow to the burners. The indoor (evaporator) fan motor (IFM) and in- duced draft motor continue to run until switch is reset.

III.START UP COOLING SECTION AND MAKE ADJUSTMENTS

CAUTION: Complete the required procedures given in the Pre-Start-Up section on page 22 before starting the unit.

Do not jumper any safety devices when operating the unit.

Do not operate the compressor when the outdoor tem- perature is below 40 F (unless accessory low-ambient kit is installed).

Do not rapid-cycle the compressor. Allow 5 minutes be- tween ``on'' cycles to prevent compressor damage.

Checking Cooling Control Operation

Start and check the unit for proper cooling control operation as follows:

1.Place room thermostat SYSTEM switch in OFF posi- tion. Observe that blower motor starts when FAN switch is placed in ON position and shuts down when FAN switch is placed in AUTO. position.

2.Place SYSTEM switch in COOL position and FAN switch in AUTO. position. Set cooling control below room tem- perature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycle shuts down when control setting is satis®ed. The evaporator fan will continue to run for 30 seconds.

3.When using an auto.-changeover room thermostat, place both SYSTEM and FAN switches in AUTO. positions. Observe that unit operates in heating mode when tem- perature control is set to ``call for heating'' (above room temperature) and operates in cooling mode when tem- perature control is set to ``call for cooling'' (below room temperature).

IMPORTANT: Three-phase, scroll compressor units (588A048,060 and 589A036-060) are direction-oriented. These units must be checked to ensure proper compressor 3-phase power lead orientation. If not corrected within 5 minutes, the internal protector will shut off the compressor. The 3-phase power leads to the unit must be reversed to correct rotation. When turning backwards, scroll compressors emit elevated noise levels, and the difference between compressor suction and discharge pressures may be dramatically lower than normal.

(Text continued on page 35.)

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Contents General ContentsSafety Considerations 588A018-042 Without Base Rail, Unit Dimensions Ð2Ð588A018-042 With Optional Base Rail, Unit Dimensions Ð3Ð588A048,060 Without Base Rail, Unit Dimensions Ð4Ð588A048,060 With Optional Base Rail, Unit Dimensions Ð5Ð589A024-036 Without Base Rail, Unit Dimensions Ð6Ð589A024-036 With Optional Base Rail, Unit Dimensions Ð7Ð589A042-060 Without Base Rail, Unit Dimensions Ð8Ð589A042-060 With Optional Base Rail, Unit Dimensions Ð9ÐIII. Ð Field Fabricate Ductwork Receiving and Installation Check EquipmentII. Ð Provide Unit Support IV. Ð Provide ClearancesCurb Ð11ÐPart Number Unit WeightUnit MAX Units With Optional Base Rail VII. Ð Install Flue HoodVIII. Ð Install GAS Piping VI. Ð Connect Condensate DrainPhysical Data Ð Unit 588A Ð14ÐPhysical Data Ð Unit 589A Ð15ÐIX. Ð Install Duct Connections Conguring Units for Down¯ow Vertical DischargeInternal Length of PIPE, FT² Iron Pipe Diameter Size Maximum Gas Flow CapacityÐ17Ð Install Electrical Connections High-Voltage ConnectionsÐ Electrical Data Ð Unit 588A Ð19ÐRLA LRA FLA Ð Electrical Data Ð Unit 589AÐ20Ð Special Procedures for 208-V Operation High- and Control-Voltage ConnectionsTransformer Protection PRE-START-UPSTART-UP Check for Refrigerant Leaks II. Start UP Heating Section and Make AdjustmentsAdjust Gas Input Check Heating ControlPressure Rated Gas Inputs at Indicated Manifold PressuresGAS Supply Pressure Manifold Natural GAS Propane Number OrificesÐ25Ð Heating Temperature Rise F InputCheck Burner Flame III. Start UP Cooling Section and Make Adjustments 208/230-1-60 Wiring Diagram, Units 588A018-060 Ð27Ð208/230-3-60 Wiring Diagram, Units 588A030-060 Ð28Ð460-3-60 Wiring Diagram, Units 588A036-060 Ð29Ð208/230-1-60 Wiring Diagram, Units 589A024-042 Ð30Ð208/230-1-60 Wiring Diagram, Units 589A048,060 Ð31Ð208/230-3-60 Wiring Diagram, Units 589A036-042 Ð32Ð208/230-3-60 Wiring Diagram, Units 589A048,060 Ð33Ð460-3-60 Wiring Diagram, Units 589A036-048 Ð34ÐSpeed Checking and Adjusting Refrigerant ChargeIndoor Air¯ow and Air¯ow Adjustments Ð36Ð Ð Superheat Charging Table, 588A018Ð Superheat Charging Table, 588A024 Ð Superheat Charging Table, 588A042 Ð Superheat Charging Table, 588A030Ð Superheat Charging Table, 588A036 Ð37ÐÐ Superheat Charging Table, 588A060 Ð38ÐÐ Superheat Charging Table, 589A036 Ð Superheat Charging Table, 589A024Ð Superheat Charging Table, 589A030 Ð39ÐÐ Superheat Charging Table, 589A060 Ð Superheat Charging Table, 589A042Ð Superheat Charging Table, 589A048 Ð40ÐRequired Suction-Tube Temperature F Ð41ÐÐ42Ð Ð43Ð Unit 589ACooling Sequence of Operation MaintenanceWet Coil Pressure Drop Unit Size Airflow Pressure DropIII. Evaporator Blower and Motor AIR FilterII. Unit TOP Removal IV. Flue GAS PassagewaysVII. Burner Ignition VI. Limit SwitchCOMBUSTION-AIR Blower VIII. Main BurnersXII. Refrigerant Circuit XI. Electrical Controls and WiringCondenser FAN XIII. GAS InputTroubleshooting Symptom Cause RemedyIntegrated control IFM runs when itPoor ¯ame characteristics MotorService Training LED OFFPage Preliminary Information START-UP ChecklistTemperatures III. START-UP Electrical
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