Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48EJ Spezifikationen

Installation, Start-Up andService InstructionsCONTENTSPageSAFETY CONSIDERATIONS ...1INSTALLATION ...1-31Step

Table 1 — Physical DataUNIT 48EJ,EK,EW,EY 024D/E 028D/E 030D/E 034D/ENOMINAL CAPACITY (tons) 20 25 27 30OPERATING WEIGHT (lb)*UnitAl/Al† (Lo Heat/Hi H

Table 1 — Physical Data (cont)UNIT 48EJ,EK,EW,EY 038D/E 044D/E 048D/ENOMINAL CAPACITY (tons) 35 40 45OPERATING WEIGHT (lb)*UnitAl/Al† (Lo Heat/Hi Heat

Table 2 — Evaporator Fan Motor Data (Units with Starting Serial Numbers 4197 and Later)UNITSIZE48EMOTORHPMOTORSHAFTDIA.(in.)FANSHAFTSPEED(rpm)MOTORSHE

Step5—TrapCondensate Drain — See Fig. 3-6for drain location. Condensate drain is open to atmosphereand must be trapped. Install a trapped drain at the

Table 3 — Controls Options and Configurations (Non-Thermostat Applications)UNIT CONFIGURATION DEFAULT COOLING DEFAULT HEATINGCV or VAV Unit with SPT Se

Features with Sensor Control of Unit (Network Applica-tions) — The base control board provides, as standard, a con-nection for use with a Carrier VVT

When a VAV unit with a space temperature sensor is ac-cessed via a computer, the following additional features areavailable:• ability to initiate time

LEGENDCCN — Carrier Comfort NetworkCOM — CommonD—DiodeLED — Light-Emitting DiodeN.C. — Normally ClosedN.O. — Normally OpenR—RelaySIO — Serial Input/Ou

Table 4 — Electrical DataUNITSIZE48ENOMNALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTCOMBUSTIONFAN MOTORPOWER SUPPLYNo. 1 No. 2Min Ma

Table 4 — Electrical Data (cont)UNITSIZE48ENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTCOMBUSTIONFAN MOTORPOWER SUPPLYNo. 1 No.

ALTERNATE UNIT SUPPORT — When the preferred curbor slab mount cannot be used, support unit with sleepers onperimeter, using unit curb support area. If

Table 4 — Electrical Data (cont)UNITSIZE48ENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTCOMBUSTIONFAN MOTORPOWER SUPPLYNo. 1 No.

IMPORTANT: THE VAV (variable air volume) unitsuse variable frequency drives, which generate, use andcan radiate radio frequency energy. If units are n

LEGENDFig. 20 — Field Control Thermostat WiringNOTE: Sensor part numbers are as follows:T-55 — CEC0121448-01T-56 — CEC0121503-01Fig. 21 — Field Contro

Remote Field Control — A switch closure across terminalsR and W1 on TB-3 will initiate the Occupied mode. Thiscan be done manually as well as through

IMPORTANT: When connecting the CCN communi-cation bus to a system element, use a color coding sys-tem for the entire network to simplify installation

HOOD SIDETOPFLANGESEALSTRIPBLACKFig. 23 — Adding Seal Strip to Top of Hood SidesNOTE: Left side economizer hood has mounting angle without tabsand filt

The outdoor-air damper closes. The control allows 90 sec-onds for the damper to close in case it is in the full openposition. Next, the indoor-fan con

Differential Enthalpy Sensor Installation — To install the con-trol, perform the following procedure:1. Turn off all power. Ensure disconnect is locke

NOTE: Switches shown in high enthalpy state. Terminals 2 and 3 closeon enthalpy decrease.Fig. 34 — Wiring Connections for Solid-StateEnthalpy Control

Step 10 — Position Power Exhaust/BarometricRelief Damper Hood —All electrical connections havebeen made and adjusted at the factory. The power exhaust

NOTES:1. All roof curb parts are to be 16 ga galvanized steel.2. Dimensions are in inches.3. To prevent standing water in the drain pan of the indoors

Step 11 — Install All Accessories — After all thefactory-installed options have been adjusted, install all field-installed accessories. Refer to the ac

START-UPUse the following information and Start-Up Checkliston page CL-1 to check out unit PRIOR to start-up.Unit Preparation — Check that unit has be

To set the VFD, the VFD must be powered up; however,since it is located near the indoor air fan, operation of thefan is not desirable. To disable the

At the upper right corner of the board is a set of 5 pins andjumper, which determines the time constant for the control.The time constant is the delay

Table 9 — Power Exhaust Default Set PointsSTAGE OFFSET DIFFERENTIAL OFF VOLTAGE ON VOLTAGEOFF STATIC PRESSURE(in. wg)1 50% 3% 6.0 6.3 0.002 55% 3% 6.5

Table 12 — Fan Performance, 48EJ/EK024-034 — Vertical Discharge Units(For EW/EY units, reduce net available external static pressure by 0.3 in. wg)AIR

Table 13 — Fan Performance, 48EJ,EK038,044 — Vertical Discharge Units(For EW/EY units, reduce net available external static pressure by 0.5 in. wg)AIR

Table 14 — Fan Performance, 48EJ,EK048 — Vertical Discharge Units(For EW/EY units, reduce net available external static pressure by 0.5 in. wg)AIRFLOW

Table 15 — Fan Performance — Power Exhaust48EJ,EK,EW,EY024-048 (20 THRU 45 TONS)Airflow(Cfm)Low Speed Medium Speed High Speed208 v 230, 460, 575 v 208

Table 17 — Air Quantity LimitsUNIT48EJ,EK,EW,EYMINIMUM HEATINGAIRFLOW(Low Heat)MINIMUM HEATINGAIRFLOW(High Heat)MINIMUM COOLINGAIRFLOW (VAV)AT FULL LO

NOTES:1. All roof curb parts are to be 16 ga galvanized steel.2. Dimensions are in inches.3. To prevent standing water in the drain pan of the indoors

Table 18 — User Defined Set PointsSET POINTNAMEFORMAT DESCRIPTION LIMITS DEFAULTOHSP xx.xF Occupied Heat Set Point 55 to 80 F 68 FOCSP xx.xF Occupied C

When cooling, the control will energize the power ex-haust enable output to the external power exhaust controller,when power exhaust is used.If occupi

MORNING WARM-UP (VAV Only) (Stand-Alone Opera-tion) — When the unit operates in stand-alone mode, morn-ing warm-up occurs when the unit is energized i

Space Temperature Reset Example — The occupied coolingset point is set to 73 F. The Reset Ratio is set to 5. The ResetLimit is set to 20° F. The Reset

• When the outdoor air quality is greater than the outdoorair quality set point (ppm)High priority — When the priority is set to high, the IAQset poin

To open, loosen the latch bolt using a7⁄16-in. wrench. Pivotthe latch so it is not in contact with the door. Open the door.To shut, reverse the above

Evaporator Fan Performance Adjustment(Fig. 49) —Fan motor pulleys are designed for speed shownin Table 1 (factory speed setting).IMPORTANT: Check to e

Evaporator-Fan Motor Replacement1. Shut off unit power supply.2. Remove upper outside panel and open hinged door togain access to motor.3. Fully retra

Main Burners — For all applications, main burners arefactory set and should require no adjustment.MAIN BURNER REMOVAL (Fig. 55)1. Shut off (field-suppl

Crankcase Heater — Each compressor has a crankcase heaterto prevent absorption of liquid refrigerant by oil in the crank-case when the compressor is i

VFD — Variable Frequency DriveNOTES:1. Weights include economizer (STD).2. Center of gravity.3. Do not locate adjacent units with flue dis-charge facin

LEGEND and NOTES for Fig. 56-60 — Typical Wiring SchematicsAHA — Adjustable Heat AnticipatorBP — Building PressureBR — Burner RelayC—Contactor, Compre

Fig. 56 — Typical Power Schematic; 48EJ,EK,EW,EY024-034; 208/230-3-60 and 460-3-6051

Fig. 57 — Typical VAV 115-v Control Circuit52

Fig. 58 — Typical CV 115-v Control Circuit53

Fig. 59 — Typical VAV 24-v Control Circuit54

Fig. 60 — Typical CV 24-v Control Circuit55

TROUBLESHOOTINGTypical refrigerant circuiting diagrams are shown in Fig. 61-63. An algorithm diagram of the IGC (Integrated Gas Unit Con-troller) cont

LEGENDFPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure SwitchFig. 62 — Typical Refrigerant Circuiting (48EJ,EK,EW,EY038,044)

LEGENDFPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure SwitchFig. 63 — Typical Refrigerant Circuiting (48EJ,EK,EW,EY048)58

NOTE: Thermostat Fan Switch in the ‘‘AUTO’’ position or sensor-equipped unit.Fig. 64 — IGC Control (Heating and Cooling)LEGENDIDM — Induced-Draft Moto

VFD — Variable Frequency DriveNOTES:1. Weights include economizer (STD).2. Center of gravity.3. Do not locate adjacent units with flue discharge facing

The alarm codes for the IGC control board are shown inTable 22.Table 22 — IGC Control Board LED AlarmsINDICATION ERROR MODEON Normal OperationOFF Hard

Tables 24-26 show the input and output channeldesignations.Table 24 — I/O Channel Designations Base Module — CVTERMINAL NO. ASSIGNMENT TERMINAL NO. AS

PACKAGED SERVICE TRAININGOur packaged service training programs provide an excellent way to increase your knowledge of theequipment discussed in this

START-UP CHECKLISTMODEL NO.:SOFTWARE VERSION (SEE FIG. 16)DATE:SERIAL NO.:TECHNICIAN:PRE-START-UP:M VERIFY THAT DIP SWITCH SETTINGS ARE CORRECTM VERIF

GENERALM SET ECONOMIZER MINIMUM VENT POSITION TO JOB REQUIREMENTSM ENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERFORMANCE TABLESHIGH PRESSURE SWITCH S

VFD — Variable Frequency DriveNOTES:1. Weights include economizer (STD).2. Center of gravity.3. Do not locate adjacent units with flue discharge facing

VFD — Variable Frequency DriveNOTES:1. Weights include economizer (STD).2. Center of gravity.3. Do not locate adjacent units with flue discharge facing

UNITWEIGHT A B Clb kg in. mm in. mm in. mm48EJ,EK,EW,EYD024 4176 189487.68 222772.4 1839 42.4 107248EJ,EWE024 4256 1930 73.3 1862 42.7 108548EJ,EK,EW,