Carrier 48EJ - Manuals

Step 5 — Trap Condensate Drain — See Fig. 3-6 for drain location. Condensate drain is open to atmosphereand must be trapped. Install a trapped drain at the drain lo-cation. A trap at least 4-in. deep must be used. See Fig. 12.Trap must be installed to prevent freeze-up. Condensate pans are sloped so...

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 system and can also beintegrated into a Carrier Comfort Network. When the unit is accessed via a PC equipped with Com- fortWorks™, Building Supervisor...

When a VAV unit with a space temperature sensor is ac- cessed via a computer, the following additional features areavailable:• ability to initiate timed override from T-55 sensors• temperature compensated start to calculate early start time before occupancy • provide space temperature reset to reset...

LEGEND CCN — Carrier Comfort NetworkCOM — CommonD — Diode LED — Light-Emitting Diode N.C. — Normally Closed N.O. — Normally OpenR — Relay SIO — Serial Input/Output SW — Switch T — Terminal Fig. 16 — Control Board Diagram *Where X is the unit control software version number. 17

Table 4 — Electrical Data UNIT SIZE 48E NOMNAL VOLTAGE (3 Ph 60 Hz) VOLTAGE RANGE COMPRESSOR OFM IFM POWER EXHAUST COMBUSTION FAN MOTOR POWER SUPPLY No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP* 024 208/230 187 254 39.1 228 25.6 160 2 1 5.3 5 16.7/15.2 — — 0.96 101...

IMPORTANT: THE VAV (variable air volume) unitsuse variable frequency drives, which generate, use andcan radiate radio frequency energy. If units are not in-stalled and used in accordance with these instructions,they may cause radio interference. They have been testedand found to comply with limits o...

LEGEND Fig. 20 — Field Control Thermostat Wiring NOTE: Sensor part numbers are as follows: T-55 — CEC0121448-01T-56 — CEC0121503-01 Fig. 21 — Field Control Temperature Sensor Wiring (CV or VAV Units) C — Contactor/Compressor CB — Circuit Breaker DIP — Dual In-Line PackageFU — Fuse HR — Heater Relay ...

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 a field-suppliedtimeclock.Service Tool, Building Supervisor, and ComfortWorks™Software — Access to the control board can be achieved throughthe termin...

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 andcheckout. See Table 6. Table 6 — Color Code Recommendations SIGNAL TYPE CCN BUS CONDUCTOR INSULATION COLOR CCN PLUG PIN NO. Positive (+) RED 1 Grou...

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 contactor will energize. Theoutdoor-air damper will remain at 0% for 30 seconds. It willthen move to the 10% position for another 30 seconds. Thiswill b...

Differential Enthalpy Sensor Installation — To install the con-trol, perform the following procedure: 1. Turn off all power. Ensure disconnect is locked out.2. Remove the economizer inlet filters from the bottom of the right hand economizer hood. See Fig. 24. 3. Remove the factory-installed, 620-ohm...

NOTE: Switches shown in high enthalpy state. Terminals 2 and 3 closeon enthalpy decrease. Fig. 34 — Wiring Connections for Solid-State Enthalpy Control (HH57AC077) CONTROL CURVE CONTROL POINT (APPROX. DEG.) AT 50% RH A 73 (23) B 70 (21) C 67 (19) D 63 (17) RH — Relative Humidity Fig. 35 — Psychromet...

Step 11 — Install All Accessories — After all the factory-installed options have been adjusted, install all field-installed accessories. Refer to the accessory installation in-structions included with each accessory. MOTORMASTER t III INSTALLATION Install Field-Fabricated Wind Baffles — Wind baffles...

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 fan, perform the follow-ing procedure: 1. Open the indoor fan circuit breaker.2. Remove the jumper between CC and ST on the terminal strip of the VFD...

At the upper right corner of the board is a set of 5 pins and jumper, which determines the time constant for the control.The time constant is the delay in response built into the con-trols. The jumper should be on the middle or bottom twopins, for the maximum time constant. The delay can bedecreased...

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) AIRFLOW (Cfm) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm B...

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) AIRFLOW (Cfm) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm B...

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 (Cfm) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp 9...

Table 15 — Fan Performance — Power Exhaust 48EJ,EK,EW,EY024-048 (20 THRU 45 TONS) Airflow (Cfm) Low Speed Medium Speed High Speed 208 v 230, 460, 575 v 208 v 230, 460, 575 v 208 v 230, 460, 575 v ESP Bhp Watts ESP Bhp Watts ESP Bhp Watts ESP Bhp Watts ESP Bhp Watts ESP Bhp Watts 6,500 0.32 2.82 3160...

Table 17 — Air Quantity Limits UNIT 48EJ,EK,EW,EY MINIMUM HEATING AIRFLOW (Low Heat) MINIMUM HEATING AIRFLOW (High Heat) MINIMUM COOLING AIRFLOW (VAV) AT FULL LOAD OPERATION MINIMUM COOLING AIRFLOW (CV) MAXIMUM AIRFLOW 024 5730 5950 2000 6,000 10,000 028 5730 5950 2500 7,500 12,500 030 5730 5950 275...

Table 18 — User Defined Set Points SET POINT NAME FORMAT DESCRIPTION LIMITS DEFAULT OHSP xx.xF Occupied Heat Set Point 55 to 80 F 68 F OCSP xx.xF Occupied Cool Set Point 55 to 80 F 78 F UHSP xx.xF Unoccupied Heat Set Point 40 to 80 F 55 F UCSP xx.xF Unoccupied Cool Set Point 75 to 95 F 90 F SASP xx....

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 in Occupiedmode and return-air temperature (RAT) is below 68 F. Warm-upwill not terminate until the RAT reaches 68 F. The heat in-terlock relay output ...

• When the outdoor air quality is greater than the outdoor air quality set point (ppm) High priority — When the priority is set to high, the IAQset point controls the outside air damper exclusively, withno regard to comfort conditioning. TIME GUARD t CIRCUIT — The Time Guard function (built into the...

To open, loosen the latch bolt using a 7 ⁄ 16 -in. wrench. Pivot the latch so it is not in contact with the door. Open the door.To shut, reverse the above procedure.NOTE: Disassembly of the top cover may be required underspecial service circumstances. It is very important that theorientation and pos...

Evaporator Fan Performance Adjustment (Fig. 49) — Fan motor pulleys are designed for speed shown in Table 1 (factory speed setting). IMPORTANT: Check to ensure that the unit drivematches the duct static pressure using Tables 12-14. To change fan speeds, change pulleys.To align fan and motor pulleys:...

Evaporator-Fan Motor Replacement 1. Shut off unit power supply.2. Remove upper outside panel and open hinged door to gain access to motor. 3. Fully retract motor plate adjusting bolts.4. Loosen the two rear (nearest the evaporator coil) motor plate nuts. 5. Remove the two front motor plate nuts and ...

Main Burners — For all applications, main burners are factory set and should require no adjustment.MAIN BURNER REMOVAL (Fig. 55) 1. Shut off (field-supplied) manual main gas valve.2. Shut off power to unit.3. Remove heating access panel.4. Disconnect gas piping from gas valve inlet.5. Remove wires f...

Crankcase Heater — Each compressor has a crankcase heaterto prevent absorption of liquid refrigerant by oil in the crank-case when the compressor is idle. Since power for the crank-case heaters is drawn from the unit incoming power, mainunit power must be on for the heaters to be energized. IMPORTAN...

LEGEND and NOTES for Fig. 56-60 — Typical Wiring Schematics AHA — Adjustable Heat Anticipator BP — Building Pressure BR — Burner Relay C — Contactor, Compressor CAP — Capacitor CB — Circuit Breaker CC — Cooling Compensator CCB — Controller Circuit Breaker CCH — Crankcase Heater COM — Communication C...

TROUBLESHOOTING Typical refrigerant circuiting diagrams are shown in Fig. 61-63. An algorithm diagram of the IGC (Integrated Gas Unit Con-troller) control is shown in Fig. 64. LEGEND FPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure Switch Fig. 61 — Typical Refrigerant Circu...

The alarm codes for the IGC control board are shown in Table 22. Table 22 — IGC Control Board LED Alarms INDICATION ERROR MODE ON Normal Operation OFF Hardware Failure 1 FLASH Fan ON/OFF Delay Modified 2 FLASHES Limit Switch Fault 3 FLASHES Flame Sense Fault 4 FLASHES 4 Consecutive Limit Switch Faul...

Tables 24-26 show the input and output channel designations. Table 24 — I/O Channel Designations Base Module — CV TERMINAL NO. ASSIGNMENT TERMINAL NO. ASSIGNMENT T1-2 SPT (CCN) — 10K V Thermistor T23-25 Compressor 2 Safety — DI (24 vac) T3-4 STO (CCN) — 10K V Thermistor T24-25 Outside Air Enthalpy —...

PACKAGED SERVICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of the equipment discussed in this manual. Product programs cover: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theo...

START-UP CHECKLIST MODEL NO.: SOFTWARE VERSION (SEE FIG. 16) DATE: SERIAL NO.: TECHNICIAN: PRE-START-UP: M VERIFY THAT DIP SWITCH SETTINGS ARE CORRECT M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT M REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS M VERIFY INSTALLAT...

GENERAL M SET ECONOMIZER MINIMUM VENT POSITION TO JOB REQUIREMENTS M ENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERFORMANCE TABLES HIGH PRESSURE SWITCH SETTING psig LOW PRESSURE SWITCH SETTING psig MOTOR PULLEY PART NUMBER FAN PULLEY PART NUMBER BELT PART NUMBER BELT SIZE in. FILTER QUANTITY FILTER ...