Bryant manual SEQUENCE OF OPERATION cont, Normal Cooling, Reheat1 Subcooling Mode - 580J04-16

Page 82
SEQUENCE OF OPERATION (cont.)

SEQUENCE OF OPERATION (cont.)

580J

On the initial power to the EconoMi$er IV control, it will take the damper up to 2 1/2 minutes before it begins to position itself. After the initial power-up, further changes in damper position can take up to 30 seconds to initiate. Damper movement from full closed to full open (or vice versa) will take between 1 1/2 and 2 1/2 minutes. If free cooling can be used as determined from the appropriate changeover command (switch, dry bulb, enthalpy curve, differential dry bulb, or differential enthalpy), then the control will modulate the dampers open to maintain the mixed air temperature setpoint at 50_F (10_C) to 55_F (13_C). If there is a further demand for cooling (cooling second stage - Y2 is energized), then the control will bring on compressor stage 1 to maintain the mixed air temperature setpoint. The EconoMi$er IV damper will be open at maximum position. EconoMi$er IV operation is limited to a single compressor.

Heating

The sequence of operation for the heating is the same as an electromechanical unit with no economizer. The only difference is how the economizer acts. The economizer will stay at the Economizer Minimum Position while the evaporator fan is operating. The outdoor air damper is closed when the indoor fan is not operating.

Optional Perfect Humidity System

Units with the factory equipped Perfect Humidity option are capable of providing multiple modes of improved dehumidification as a variation of the normal cooling cycle. The Perfect Humidity option includes additional valves in the liquid line and discharge line of each refrigerant circuit, a small reheat condenser coil downstream of the evaporator, and Motormaster

variable-speed control of some or all outdoor fans. Operation of the revised refrigerant circuit for each mode is described below.

NOTE: x = refrigerant circuit A, B, or C.

Normal Cooling

Refrigerant flows from the outdoor condenser through the normally open Cooling Valve (CV.x) to the expansion device. Reheat1 Valve (RH1.x) and Reheat2 Valve (RH2.x) are closed.

Reheat1 (Subcooling Mode) - 580J04-16

This mode increases latent cooling and decreases sensible cooling compared to normal cooling. Refrigerant flows from the outdoor condenser, through the normally open Reheat1 Valve (RH1.x), and through the reheat condenser coil to the expansion device. Cooling Valve (CV.x) and Reheat2 Valve (RH2.x) are closed.

Reheat2 (Hot Gas Reheat Mode) - 580J04-16

This mode provides maximum latent cooling with little to no sensible capacity. This mode can operate to provide dehumidification when there is no cooling demand. Like Reheat1 mode, refrigerant flows from the outdoor condenser, through the normally open Reheat1 Valve (RH1.x), and through the reheat condenser coil to the expansion device. The Cooling Valve (CV.x) is closed. Reheat2 Valve (RH2.x) is open which provides some compressor discharge gas to the reheat condenser to further increase the reheat of the evaporator airstream.

RH2.x

 

 

RH1.x

COND COIL

PERFECT HUMIDITY

COMP

COIL

 

CV.x

OUTDOOR AIR

 

EVAP COIL

Optional Perfect Humidity System CLOSED VALVE

OPEN VALVE

METERING DEVICE

INDOOR ENTERING

AIR

a48-8172

 

 

C09455

Normal Cooling Mode - Perfect Humidity System (580J04-16)

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Contents Unit shown with optional louvered hail guard Product Data580J the environmentally sound refrigerantEasy to maintain TABLE OF CONTENTSEasy to install Easy to useFEATURES AND BENEFITS 580JMODEL NUMBER NOMENCLATURE 580J580J CATEGORYFACTORY OPTIONS AND/OR ACCESSORIES FACTORY OPTIONS AND/OR ACCESSORIES cont LEGEND Table 2 – AHRI COOLING RATING TABLE580J NOTES580J AL/SS HEAT EXCHANGERTable 5 – SOUND PERFORMANCE TABLE 580JTable 4 - HEATING RATING TABLE - LOW NOx1 dB ---DecibelCOOLING 580JUNIT HEATINGCOOLING 580JTable 7 – PHYSICAL DATA 3 - 6 TONSHEATING Heat Anticipator setting AmpsTable 8 – PHYSICAL DATA 3 - 6 TONSCOOLING 580JTable 9 – PHYSICAL DATA 7.5 - 8.5 TONS7.5 - 8.5 TONS Table 10 – PHYSICAL DATAHEATING 580J10 - 15 TONS Table 11 – PHYSICAL DATACOOLING 580J10 - 15 TONS Table 12 – PHYSICAL DATAHEATING 580JFig. 1 - Dimensions 580J CURBS & WEIGHTS DIMENSIONS - 580J580J Fig. 3 - Service Clearance CURBS & WEIGHTS DIMENSIONS - 580J 04-07contFig. 2 - Dimensions 580J 580JACCESSORY CURBS & WEIGHTS DIMENSIONS - 580J 04-07contACCESSORY 580J580J CURBS & WEIGHTS DIMENSIONS - 580JFig. 5 - Dimensions 580J C101217580J CURBS & WEIGHTS DIMENSIONS - 580J 08-12contFig. 7 - Service Clearance Fig. 6 - 580J580J CURBS & WEIGHTS DIMENSIONS - 580JACCESSORY Fig. 8 - Roof Curb Details580J CURBS & WEIGHTS DIMENSIONS - 580JFig. 9 - Dimensions 580J-14 C101223Fig. 10 - Service Clearance CURBS & WEIGHTS DIMENSIONS - 580J 14 cont580J 580J CURBS & WEIGHTS DIMENSIONS - 580JC101231 580J CURBS & WEIGHTS DIMENSIONS - 580J 16 contC101232 580J CURBS & WEIGHTS DIMENSIONS - 580JC10772 OPTIONS & ACCESSORY WEIGHTS 580JAPPLICATION DATA Low ambient applications APPLICATION DATA contSizing a rooftop 580JI.Determine cooling and heating loads SELECTION PROCEDURE WITH 580J*07A EXAMPLE1580J II.Make an initial guess at cooling tons3 TONS Table 13 - COOLING CAPACITIES1-STAGECOOLING 580J1-STAGECOOLING 580JTable 14 – COOLING CAPACITIES 3 TONS4 TONS Table 15 – COOLING CAPACITIES1-STAGECOOLING 580J1-STAGECOOLING 580JTable 16 – COOLING CAPACITIES 4 TONS5 TONS Table 17 – COOLING CAPACITIES1-STAGECOOLING 580J1-STAGECOOLING 580JTable 18 – COOLING CAPACITIES 5 TONS6 TONS Table 19 – COOLING CAPACITIES1-STAGECOOLING 580J1-STAGECOOLING 580JTable 20 – COOLING CAPACITIES 6 TONS7.5 TONS Table 21 – COOLING CAPACITIES1-STAGECOOLING 580J2-STAGECOOLING 580JTable 22 – COOLING CAPACITIES 7.5 TONS7.5 TONS Table 23 – COOLING CAPACITIES2-STAGECOOLING 580J1-STAGECOOLING 580JTable 24 – COOLING CAPACITIES 8.5 TONS8.5 TONS Table 25 – COOLING CAPACITIES2-STAGECOOLING 580J2-STAGECOOLING 580JTable 26 – COOLING CAPACITIES 8.5 TONS10 TONS Table 27 - COOLING CAPACITIES1-STAGECOOLING 580J2-STAGECOOLING 580JTable 28 – COOLING CAPACITIES 10 TONS10 TONS Table 29 – COOLING CAPACITIES2-STAGECOOLING 580J2-STAGECOOLING 580JTable 30 - COOLING CAPACITIES 12.5 TONS12.5 TONS Table 31 – COOLING CAPACITIES2-STAGECOOLING 580J2-STAGECOOLING 580JTable 32 – COOLING CAPACITIES 15 TONSFig. 14 - Horizontal Power Exhaust Performance ECONOMIZER, BAROMETRIC RELIEF AND PE PERFORMANCEHorizontal Power Exhaust PERFECT HUMIDITYFig. 15 - Barometric Relief Flow Capacity Fig. 18 - Vertical Power Exhaust Performance580J Fig. 19 - Barometric Relief Flow-Horizontal15 TonGeneral fan performance notes Fig. 23 - Horizontal Power Exhaust Performance580J 1 PHASE FAN PERFORMANCE1 PHASE 580J3 PHASE FAN PERFORMANCE cont3 PHASE Table 36 - 580J**04FAN PERFORMANCE cont 1 PHASE1 PHASE 580JFAN PERFORMANCE cont 3 PHASE3 PHASE Table 40 – 580J**05FAN PERFORMANCE cont 1 PHASE1 PHASE 580JFAN PERFORMANCE cont 3 PHASE3 PHASE Table 44 – 580J**06FAN PERFORMANCE cont 3 PHASE3 PHASE 580JFAN PERFORMANCE cont 3 PHASE3 PHASE Table 48 – 580J**08FAN PERFORMANCE cont 3 PHASE3 PHASE 580JFAN PERFORMANCE cont 3 PHASE3 PHASE Table 52 – 580J**12FAN PERFORMANCE cont 3 PHASE3 PHASE 580JTable 56 – 580J*16 3 PHASE3 PHASE 15 TON VERTICAL SUPPLYFAN PERFORMANCE cont Table 58 - PULLEY ADJUSTMENTFactory settings 580J1-StageCooling ELECTRICAL INFORMATIONTable 59 – 580J*04A 3 TONSTable 62 – 580J*07A ELECTRICAL INFORMATION cont580J 1-StageCooling1-StageCooling ELECTRICAL INFORMATION contTable 65 – 580J*09A 8.5 TONSTable 68 – 580J*12D ELECTRICAL INFORMATION cont580J 2-StageCooling580J COMBUSTION580J COMBUSTIONTable 72 – MCA/MOCP DETERMINATION W/ PWRD C.O 580JTABLE 68 cont. MCA/MOCP DETERMINATION W/ PWRD C.O 580JFig. 24 - 1-StageCooling Typical Power Diagram TYPICAL WIRING DIAGRAMS580J 580J Fig. 25 - 2-StageCooling Typical Power DiagramC08577B 580J Fig. 26 - 1-StageTypical Wiring DiagramC08524 580J Fig. 27 - 2-StageTypical Wiring DiagramC08578 Electromechanical units with an economizer SEQUENCE OF OPERATIONElectromechanical units with no economizer Cooling —Reheat1 Subcooling Mode - 580J04-16 SEQUENCE OF OPERATION contNormal Cooling Reheat2 Hot Gas Reheat Mode - 580J04-16580J RH2.x580J GUIDE SPECIFICATIONS - 580J**04-16Gas Heat/Electric Cooling Packaged Rooftop Size Range23 81 19 Self-ContainedAir Conditioners 23 09 93 Sequence of Operations for HVAC Controls23 40 13 Panel Air Filters 580J580J 3.Unit shall be designed to conform to ASHRAE 15,5.Base Rail 580J580J 3.Standard Heat Exchanger construction5.Standard All Aluminum Novation Coils 580J580J 2.Belt-drivenEvaporator Fan3.Manual damper 580Jc.Disconnect Switch Bracket 580J21.Winter start kit 580JPrinted in U.S.A 580JCatalog No. PDS580J---10 Edition Date: 01/11
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