Carrier 50EJ - Manuals

Table 1 — Physical Data UNIT 50EJ,EK,EW,EY 024 028 030 034 NOMINAL CAPACITY (tons) 20 25 27 30 OPERATING WEIGHT (lb)* Unit Al/Al† 4016 4102 4102 4102 Al/Cu† 4236 4322 4322 4322 Roof Curb (14-in. curb) 365 365 365 365 COMPRESSOR Type Ckt 1 06D328 06D328 06D537 06D537 Ckt 2 06D818 06D328 06D328 06D537...

Table 2 — Evaporator Fan Motor Data UNIT SIZE MOTOR HP MOTOR SHAFT DIAMETER (in.) FAN SHAFTSPEED (rpm) MOTOR SHEAVE MOTOR SHEAVE PITCH DIAMETER (in.) BUSHING DIAMETER (in.) FAN SHEAVE FAN SHEAVE PITCH DIAMETER (in.) BUSHING DIAMETER (in.) BELT OUTSIDE BELT LENGTH BELT TENSION (Lb @ .24 in.) 024 5 1....

Step 6 — Controls Options — The control options that the units can provide are based on the following param-eters: CV (constant volume) or VAV (variable air volume)operation; stand-alone unit with field-supplied sensors in-stalled (CV or VAV); as a system via the Carrier ComfortSystem (TEMP or VVT);...

Features with sensor control of unit with computer access are: • 365 day timeclock with backup (supports minute, hour, day of week, date, month, and year) • daylight savings time function• occupancy control with 8 periods for unit operation• holiday table containing up to 18 holiday schedules• abili...

Fig. 12 — Control Board Diagram LEGEND CCN — Carrier Comfort Network R— Relay COM — Common SIO — Serial Input/Output D— Diode SW — Switch N.C. — Normally Closed T— T erminal N.O. — Normally Open *Where X is the unit control software version (1 or 2). 14

For units running Version 1.0 of the unit control software, network access software is required to enable occupied heat-ing. For units running Version 2.0 of the unit control soft-ware, occupied heating is enabled or disabled by the posi-tion of DIP switch no. 5. Additional features may be provided ...

Remote Field Control (Units Running Version 2.0 of UnitControl Software) — A switch closure across terminals Rand W1 on TB-3 will initiate the Occupied mode. This canbe done manually as well as through a field-suppliedtimeclock.Service Tool, Building Supervisor, and Comfort Works —Access to the cont...

NOTE: Before assembly of the economizer hood, check alongthe outer edges of the economizer assembly for any seal stripprotruding past the flanges. Trim the excess seal strip so thatit is flush with the economizer assembly flanges. 1. Apply black seal strip (provided in package) to outside top-edge o...

Step 10 — Install 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 SENSOR LOCATION — Motor- master III sensor locations are shown in Fi...

START-UP Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up. Unit Preparation — Check that unit has been installed in accordance with these installation instructions and appli-cable codes. Compressor Mounting — Loosen the compressor hold- down bolts...

Power Exhaust — The optional non-modulating power exhaust (CV only) is a two-stage design where the operationof the exhaust fans is linked to economizer position. Whenthe supply fan is running and the economizer is 25% open,the base module closes contacts, activating 2 exhaust fans.When the economiz...

Table 12 — Fan Performance, 50EJ/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 Bhp...

Table 14 — Fan Performance, 50EJ048 — Vertical Discharge Units FOR EW 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 13,000 68...

interlock relay signals for the air terminals to fully open. SeeFig. 35. In the Occupied mode, the indoor-fan motor willoperate continuously and the outdoor-air dampers will be inthe minimum position. In the Unoccupied mode, the indoor-fan motor will be off, but will energize upon the call for heat....

CAPACITY CONTROL, COOLING — The cooling capac-ity staging tables are shown in Tables 18 and 19. Table 18 — Cooling Capacity Staging Table CV Units with 2 Compressors STAGES 0 1 ECONOMIZER 2 3 Compressor 1 Off Off On On Compressor 2 Off Off Off On NOTE: On CV units that require additional unloading, ...

Cleaning — Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require.Remove unit top panel and/or side panels for access to unitinterior. EVAPORATOR COIL — Clean as required with a commer-cial coil cleaner. CONDENSER COIL — Clean condenser coil annua...

Belt Tension Adjustment — To adjust belt tension: 1. Remove power to unit.2. Remove motor mount nuts and bolts.3. Loosen fan motor nuts. See Fig. 39.4. Turn motor jacking bolts to move motor mounting plate left or right for proper belt tension. A slight bow shouldbe present in the belt on the slack ...

TROUBLESHOOTING Typical refrigerant circuiting diagrams are shown in Fig. 43-45. LEGEND FPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure Switch Fig. 43 — Typical Refrigerant Circuiting (50EJ,EK,EW,EY024-034) 46

LEGEND FPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure Switch Fig. 44 — Typical Refrigerant Circuiting (50EJ,EK,EW,EY038,044) 47

LEGEND FPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure Switch Fig. 45 — Typical Refrigerant Circuiting (50EJ,EW048) 48

Diagnostic LEDs (Light-Emitting Diodes) — There are 3 LEDs (red, yellow, and green) on the lower right handside of the control board. The red light is used to checkunit operation and alarms. A constant pulse is normal unitoperation. A series of quick blinks indicates an alarm. Refer to Table 20 belo...

Tables 21-23 show the input and output channel designations. Table 21 — I/O Channel Designations Base Module — CV TERMINAL NO. ASSIGNMENT T1-2 SPT (CCN) — 10K V Thermistor T3-4 STO (CCN) — 10K V Thermistor T5-6 OAT — 5K V Thermistor T7-8 SAT — 5K V Thermistor T9-10 — T11-12 SAT Reset — AI (2-10 vdc)...

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

START-UP CHECKLIST (cont) GENERAL M ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS 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 ...