Manuals / Carrier / Household Appliance / Air Conditioner

Carrier 48AW, 48EW, 48EK, 48AK Start-Up, Wiring Field-SuppliedUnloaders for, Constant Volume Units

Models: 48EJ 48AJ 48AK 48EK 48AY020-060 48AW 48EY024-068 48EW

1 118

Download 118 pages 46.64 Kb

Page 58

START-UP

LOCATION BAROMETRIC RELIEF OR POWER EXHAUST “SIDE #2”

23.28”

TYP

“END #2”

“END #1”

42.62

TYP

ALTERNATE LOCATION (END)

ECONOMIZER

HOOD

“SIDE #1”

23.28” 42.62”

R/AS/A

42.56”

ECONOMIZER

HOOD

42” MIN.

12.94

R/A(UNIT

OPENING)

S/A

J BOX

PLENUM RATED CABLE

(FIELD SUPPLIED)

J BOX

NOTE: 024-048, 020-050 SIZES SHOWN (2 POWER EXHAUST FANS) 060, 054-068 SIZES HAVE 3 POWER EXHAUST FANS. ALL UNIT SIZES HAVE THE SAME SIZE POWER EXHAUST.

Fig. 55 — Power Exhaust Relocated to Side Return Duct

BASE MODULE

START-UP

Use the following information and Start-Up Checklist on pages CL-1 and CL-2 to check out unit PRIOR to start-up.

DISCRETE OUTPUTS

COMP #2 UNLOADER COM COMP #1 UNLOADER

CYCLIC COND FAN COM CONT COND FAN

POWER EXHAUST

COM POWER EXHAUST

ELEC HEAT 2

COM

ELEC HEAT 1

T39

T38

T37

T36

T35

T34

T31

T32

T33

T30

T29

T28

UL2

UL1

Unit Preparation — Check that unit has been installed in accordance with these installation instructions and applicable codes.

Compressor Mounting — Loosen the compressor hold-down bolts until sidewise movement of the washer under each holddown bolt head can be obtained. Do not loosen com- pletely as bolts are self-locking and will maintain adjustment.

Service Valves — Ensure that the suction, discharge, and liquid line service valves are open. Damage to the compressor could result if they are left closed.

ECONOMIZER

4-20 mA OUPUT

T26

Internal Wiring — Check all electrical connections in unit control boxes; tighten as required.

Fig. 56 — Wiring Field-Supplied Unloaders for

Constant Volume Units

Refrigerant Service Ports — Each refrigerant system has one suction port located in the top of the compressor motor casing. All units also have one service port on the liquid line valve and one on the compressor discharge valve. Be sure that caps on the ports are tight.

58

Image 58

Carrier 48AW, 48EW, 48EY024-068, 48AY020-060, 48EK, 48AK Start-Up, Wiring Field-SuppliedUnloaders for, Constant Volume Units

Contents

INSTALLATION Step 1 — Provide Unit Support CONTENTSSAFETY CONSIDERATIONS Step 11 — Position Power Exhaust/BarometricStep 4 — Make Unit Duct Connections Page Page Page NOTES Fig. 5 - Base Unit Dimensions - 48AJ,AK020-030 Fig. 6 — Base Unit Dimensions — 48AJ,AK035-050 Fig. 7 — Base Unit Dimensions — 48AJ,AK060 Fig. 8 — Base Unit Dimensions — 48AW,AY020-030 Fig. 9 — Base Unit Dimensions — 48AW,AY035-050 Fig. 10 — Base Unit Dimensions — 48W,AY060 Fig. 11 — Base Unit Dimensions — 48EJ,EK024-034 Fig. 12 — Base Unit Dimensions — 48EJ,EK038-048 Fig. 13 — Base Unit Dimensions — 48EJ,EK054-068 Fig. 14 — Base Unit Dimensions — 48EW,EY024-034 Fig. 15 — Base Unit Dimensions — 48EW,EY038-048 Fig. 16 — Base Unit Dimensions — 48EW,EY054-068 Fig. 17 — Rigging Information Fig. 17 — Rigging Information cont Table 1A — Physical Data — 48AJ,AK,AW,AY Units UNIT 48AJ,AK,AW,AY Table 1B — Physical Data — 48EJ,EK,EW,EY Units UNIT 48EJ,EK,EW,EY UNIT 48EJ,EK,EW,EY 48AJ,AK,AW,AY Units Table 2 — Operating Weights48EJ,EK,EW,EY Units Fig. 18 — Air Distribution — Thru-the-Bottom Table 3 — Evaporator Fan Motor DataFig. 19 — Air Distribution — Thru-the-Side Step 5 — Install Flue Hood Fig. 23 — Field Gas Piping Table 4 — 48A,E Series Staged Gas ImplementationTable 6 - Thermistor Designations Fig. 24 — Supply-AirThermistor Connections Fig. 25 — Indoor Air Quality Sensor Configuration Fig. 26 — Field Control Remote Start/StopStep 9 - Make Electrical Connections Fig. 27 — Control Board Diagram Table 7 — Electrical Data — 48AJ,AK,AW,AY Units UNIT SIZE 30.8/28.0 236.3/230.9 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units 30.8 0.96 UNIT Fig. 28 - Field Power Wiring Connections LEGEND Thermostat Wiring CV Only- Install a Carrier-approvedaccessory thermostat assembly per current price pages according to the installation instructions included with the ac- cessory or these instructions. Locate the thermostat on a solid interior wall in the conditioned space to sense the average temperature LEGEND Wiring CV or VAV Units Fig. 32 — Field Control Thermostat WiringFig. 33 — Field Control Temperature Sensor Table 9 — CCN Connection Approved Shielded CablesFig. 34 - Space Temperature Averaging Wiring Step 10 — Make Outdoor-AirInlet AdjustmentsFig. 35 — Field HIR Heat Interlock Relay Wiring Fig. 36 — Adding Seal Strip to Top of Hood Sides Fig. 37 - Economizer Hood AssemblyRight Side/Center Economizer Hood Shown Fig. 39 — Adding Seal Strip to Back of Hood Top Fig. 38 — Adding Seal Strip to Sides of Hood TopMounting Flange Fig. 40 — Adding Foam Strip to Cross MemberFig. 43 - Mounting Angle Without Tabs Attached to Filter Track AssemblyFilter Track Assembly Fig. 44 — Mounting Angle With Tabs Attached toEnthalpy Control HH57AC077 Fig. 47 - Wiring Connections for Solid-StateSave screws CONTROL POINT Fig. 49 - Economizer DetailsCONTROL CURVEFig. 51 - Pressure Transducer Locations 48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068Fig. 53A — Motormaster III Sensor Location Fig. 52 - Motormaster III Control Baffle Details48AJ,AK,AW,AY020-030and 48EJ,EK,EW,EY024-034 Fig. 53C — Motormaster III Sensor Location Fig. 53B — Motormaster III Sensor Location48AJ,AK,AW,AY035 and 48EJ,EK,EW,EY038 48AJ,AK,AW,AY040, 050 and 48EJ,EK,EW,EY048Step 13 — Field Modifications Fig. 54 — Side Return Air ConversionConstant Volume Units Fig. 56 — Wiring Field-SuppliedUnloaders forSTART-UP Factory-InstalledJumpers Fig. 57 — Toshiba TOSVERT130-E3VFD13.Replace jumper across terminals ST and CC 13.Replace jumper across terminals R and CC LEGEND Typical Factory Wiring Optional Field WiringSee below for building pressure to signal level Table 17 — DIP Switch Configuration Table 18 — DIP Switch Factory Settings AIRFLOW AIRFLOW AIRFLOW 1.06 2.15 3.18 4.81 AIRFLOW AIRFLOW AIRFLOW AIRFLOW AIRFLOW AIRFLOW Table 33 — Motor Limitations Table 34 — Air Quality LimitsSequence of Operation Table 35 — User Defined Set Points Table 36 - Software Control Link PointsThe Time Guard function maintains a minimum off time of 5 minutes, a minimum ON time of 10 seconds, and a minimum delay before starting the second compressor of 10 seconds Fig. 59 — Heat Interlock Relay Wiring Table 37 — Staged Gas System Components Table 38 — Stage Gas System Inputs/OutputsFig. 60 — Navigator Display Table 39 — Navigator Display Menu StructureTable 40 — Occupied Heat and Morning Warm-Up Fig. 61 — Space Temperature Reset WiringOperation and Controlling Factors Fig. 62 - Field-SuppliedSmoke Detector Wiring Table 42 — Cooling Capacity Staging Table, CV Table 41 — Smoke Control ModesUnits with 2 Compressors Fig. 64 — Spark Gap Adjustment SERVICEFig. 63 — Door Latch Fig. 65 — Typical Gas Heating Section Fig. 66 — Gas Heat Section DetailsLubrication Fig. 67 — Evaporator-FanAlignment and AdjustmentFig. 68 — Evaporator Fan Coupling Evaporator-FanMotor Replacement Evaporator Fan Service and ReplacementBelt Tension Adjustment — To adjust belt tension Condenser-FanAdjustmentFig. 72 — Cooling Charging Chart Gas Valve AdjustmentFig. 71 — Cooling Charging Chart 48EJ,EK,EW,EY024-03448EJ,EK,EW,EY054-068 Fig. 73 — Cooling Charging ChartFig. 74 — Cooling Charging Chart 48AJ,AK,AW,AY020-060LEGEND for Fig. 77-83— Typical Wiring Schematics Protective DevicesTABLE 1A Fig. 78 — Typical 48EK VAV 24-VControl Circuit Fig. 79 — Typical CV 24-VControl Circuit Fig. 80 — Typical 48EK VAV 115-VControl Circuit Fig. 81 — Typical 48EJ CV 115-VControl Circuit Page Page TROUBLESHOOTING LPS - Low-PressureSwitch FPS — Freeze Protection SwitchHPS - High-PressureSwitch LEGENDcompressor HPS — High-PressureSwitch LEGEND FPS — Freeze Protection SwitchLPS — Low-PressureSwitch 8-Pass HPS — High-PressureSwitch LEGEND FPS — Freeze Protection SwitchLPS — Low-PressureSwitch LPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitchTXV — Thermostatic Expansion Valve LEGEND HPS - High-PressureSwitchLPS — Low-PressureSwitch TXV — Thermostatic Expansion ValveLPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitchTXV — Thermostatic Expansion Valve LPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitchTXV — Thermostatic Expansion Valve LEGEND IDM — Induced-DraftMotor Fig. 94 — IGC Control Heating and CoolingIGC — Integrated Gas Unit Controller Table 44 - IGC Control Board LED Alarms Table 45 — Control Board LED AlarmsPage SERVICE TRAINING CALL FOR FREE CATALOGPRE-START-UP START-UPCHECKLISTTEMPERATURES ELECTRICALGENERAL