Instruction/ maintenance manual of the product 50EW Carrier
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Installation, Start-Up and Service Instructions CONTENTS Page SAFETY CONSIDERA TIONS .................. 1 INST ALLA TION ............................ 1-31 Step 1 — Provide Unit Support .............. 1 • ROOF CURB • AL TERNA TE UNIT SUPPOR T Step 2 — Rig and Place Unit .
NOTES: 1. Unless otherwise specified, all dimensions are to out- side of part. 2. Roof curb accessory is shipped disassembled. 3. All roof curb parts are to be 16 ga galvanized steel. 4. Dimensions are in inches. Fig. 1 — Roof Curb (Sizes 024-034) UNIT LEVELING TOLERANCES DIMENSIONS* (Degrees and Inches) AB Deg.
NOTES: 1. Unless otherwise specified, all dimensions are to out- side of part. 2. Roof curb accessory is shipped disassembled. 3. All roof curb parts are to be 16 ga galvanized steel.
NOTES: 1. Weights include economizer (Std) 2. Center of gravity . 3. Do not locate adjacent units with dis- charge facing economizer inlet. Mini- mum clearances to be: Adjacent Units: 15 8 -0 9 T op of Units: No overhang Condenser Coil: 4 8 -0 9 Economizer Side: 6 8 -0 9 Filter Access Side: 10 8 -0 9 (for re- moval of evaporator coil) 4.
NOTES: 1. Weights include economizer (Std) 2. Center of gravity . 3. Do not locate adjacent units with discharge facing economizer inlet. Mini- mum clearances to be: Adjacent Units: 15 8 -0 9 T op of Units: No overhang Condenser Coil: 4 8 -0 9 Economizer Side: 6 8 -0 9 Filter Access Side: 10 8 -0 9 (for removal of evaporator coil) 4.
NOTES: 1. Weights include economizer (Std) 2. Center of gravity . 3. Do not locate adjacent units with discharge facing econo- mizer inlet. Minimum clearances to be: Adjacent Units: 15 8 -0 9 T op of Units: No overhang Condenser Coil: 4 8 -0 9 Economizer Side: 6 8 -0 9 Filter Access Side: 10 8 -0 9 (for removal of evaporator coil) 4.
NOTES: 1. Weights include economizer (Std) 2. Center of gravity . 3. Do not locate adjacent units with discharge facing economizer inlet. Minimum clearances to be: Adjacent Units: 15 8 -0 9 T op of Units: No overhang Condenser Coil: 4 8 -0 9 Economizer Side: 6 8 -0 9 Filter Access Side: 10 8 -0 9 (for removal of evaporator coil) 4.
Step 2 — Rig and Place Unit — Inspect unit for trans- portation damage. File any claim with transportation agency . Keep unit upright, and do not drop. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof.
T able 1 — Physical Data UNIT 50EJ,EK,EW ,EY 024 028 030 034 NOMINAL CAP ACITY (tons) 20 25 27 30 OPERA TING WEIGHT (lb)* Unit Al/Al† 4016 4102 4102 4102 Al/Cu† 4236 4322 4322 4322 Roof Curb (14-in.
T able 1 — Physical Data (cont) UNIT 50EJ,EK,EW ,EY 038 044 048 NOMINAL CAP ACITY (tons) 35 40 45 OPERA TING WEIGHT (lb)* Unit Al/Al† 4282 4508 4795 Al/Cu† 4567 4793 5175 Roof Curb (14-in.
T able 2 — Evaporator Fan Motor Data UNIT SIZE MOTOR HP MOTOR SHAFT DIAMETER (in.) FA N SHAFT SPEED (rpm) MOTOR SHEA VE MOTOR SHEA VE PITCH DIAMETER (in.) BUSHING DIAMETER (in.) FA N SHEA VE FA N SHEA VE PITCH DIAMETER (in.) BUSHING DIAMETER (in.) BEL T OUTSIDE BEL T LENGTH BEL T TENSION (Lb @ .
Step 6 — Controls Options — The control options that the units can provide are based on the following param- eters: CV (constant volume) or V A V (variable air volume) operation; stand-alone unit .
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 • occ.
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).
For units running V ersion 1.0 of the unit control software, network access software is required to enable occupied heat- ing. For units running V ersion 2.0 of the unit control soft- ware, occupied heating is enabled or disabled by the posi- tion of DIP switch no.
A3 1 ⁄ 2 -in. NPT coupling for field power wiring and a 3 ⁄ 4 -in. NPT coupling for 24-v control wiring are provided in basepan. In the side post, there are two 2 1 ⁄ 2 -in. (024-034) or 3-in. (038-048) knockouts for the field power wiring. See Fig.
T able 4 — Electrical Data — 50EJ,EK,EW ,EY024-048 UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 024 208/230 187 254 39.
T able 4 — Electrical Data — 50EJ,EK,EW ,EY024-048 (cont) UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 028 208/230 187 254 39.
T able 4 — Electrical Data — 50EJ,EK,EW ,EY024-048 (cont) UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 030 208/230 187 254 57.
T able 4 — Electrical Data — 50EJ,EK,EW ,EY024-048 (cont) UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 034 208/230 187 254 57.
T able 4 — Electrical Data — 50EJ,EK,EW ,EY024-048 (cont) UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 038 208/230 187 254 57.
T able 4 — Electrical Data — 50EJ,EK,EW ,EY024-048 (cont) UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 044 208/230 187 254 69.
T able 3 — Electrical Data — 50EJ,EK,EW ,EY024-048 (cont) UNIT SIZE NOMINAL VOL T AGE (3 Ph 60 Hz) VOL T AGE RANGE COMPRESSOR OFM IFM POWER EXHAUST ELECTRIC HEA T* POWER SUPPL Y No. 1 No. 2 Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP† 048 208/230 187 254 82.
DIP — Dual In-Line Package PEC − Power Exhaust Controller Fig. 14 — Control Box Diagram (Sizes 024-034) DIP — Dual In-Line Package PEC — Power Exhaust Controller Fig.
Remote Field Control (Units Running V ersion 2.0 of Unit Control Software) — A switch closure across terminals R and W1 on TB-3 will initiate the Occupied mode.
NOTE: Before assembly of the economizer hood, check along the outer edges of the economizer assembly for any seal strip protruding past the flanges. T rim the excess seal strip so that it is flush with the economizer assembly flanges. 1. Apply black seal strip (provided in package) to outside top-edge of hood sides.
HOOD TOP HOOD SIDE Fig. 21 — Adding Seal Strip to Hood T op Mounting Flange CROSS MEMBER GRA Y FOAM STRIP Fig. 22 — Adding Foam Strip to Cross Member HOOD SIDE (SLOTTED) HOOD TOP Fig. 23 — Adding Foam Strip to Hood Side BLOCKOFF BAFFLE GRA Y FOAM STRIP Fig.
Minimum Damper Position Setting — Setting of the out- door air damper position is performed in conjunction with a shortened version of the field-run test. This is performed by first opening DIP (Dual In-Line Package) switch no. 6 then no. 4. See Fig.
Step 9 — Position Power Exhaust/Barometric Relief Damper Hood — All electrical connections have been made and adjusted at the factory . The power exhaust blowers and barometric relief dampers are shipped as- sembled and tilted back into the unit for shipping.
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 LOCA TION — Motor- master III sensor locations are shown in Fig.
Fig. 33B — Motormaster T III Sensor Location (Sizes 038 and 044) Fig. 33C — Motormaster III Sensor Location (Size 048) 31.
ST ART -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.
Power Exhaust — The optional non-modulating power exhaust (CV only) is a two-stage design where the operation of the exhaust fans is linked to economizer position. When the supply fan is running and the economizer is 25% open, the base module closes contacts, activating 2 exhaust fans.
T able 10A — DIP Switch Configuration (V ersion 1.0 of Unit Control Software) SETTING 1 2 3 4 5 6 7 8 OPEN VAV CCN/ Sensors Expansion I/O Board Field T est ON Modulated Power Exhaust T ime Guard Override ON/ Set Min.
DIP switch configurations for V ersion 1.0 of the Unit Con- trol Software are as follows: • DIP switch 1 configures the unit to operate as a variable air volume (V A V) or constant volume (CV) uni.
T able 12 — Fan Performance, 50EJ/EK024-034 — V ertical Discharge Units FOR EW/EY UNITS, REDUCE NET A V AILABLE EXTERNAL ST A TIC PRESSURE BY 0.3 IN. WG AIRFLOW (Cfm) A V AILABLE EXTERNAL ST A TIC 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 4,000 322 0.
T able 13 — Fan Performance, 50EJ038,044 and 50EK044 — V ertical Discharge Units For EW/EY UNITS, REDUCE NET A V AILABLE EXTERNAL ST A TIC PRESSURE BY 0.5 IN. WG AIRFLOW (Cfm) A V AILABLE EXTERNAL ST A TIC PRESSURE (in. wg) 0.2 0.4 0.6 0.8 1.0 1.2 1.
T able 14 — Fan Performance, 50EJ048 — V ertical Discharge Units FOR EW UNITS, REDUCE NET A V AILABLE EXTERNAL ST A TIC PRESSURE BY 0.5 IN. WG AIRFLOW (Cfm) A V AILABLE EXTERNAL ST A TIC 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 13,000 683 7.
T able 16 — Motor Limitations ST ANDARD EFFICIENCY MOTORS Nominal Hp Maximum Bhp Maximum Amps Maximum W atts Motor Efficiency 208 230 460 575 5 5.9 17.94 16.99 — — 5,348 82.3 5.9 — — 8.50 5.78 5,240 84.0 7.5 8.7 25.52 24.36 — — 7,717 84.
The control module will operate economizer , run diag- nostics to monitor alarms/alerts at all times, and respond to CCN communications to perform any configured network POC (product outboard control) functions such as time/ outdoor-air temperature broadcast and global occupancy broad- cast.
interlock relay signals for the air terminals to fully open. See Fig. 35. In the Occupied mode, the indoor-fan motor will operate continuously and the outdoor-air dampers will be in the minimum position. In the Unoccupied mode, the indoor- fan motor will be of f, but will energize upon the call for heat.
CAP ACITY CONTROL, COOLING — The cooling capac- ity staging tables are shown in T ables 18 and 19. T able 18 — Cooling Capacity Staging T able CV Units with 2 Compressors ST AGES 0 1 ECONOMIZER 23.
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 unit interior . EV APORA TOR COIL — Clean as required with a commer- cial coil cleaner .
Belt T ension Adjustment — T o adjust belt tension: 1. Remove power to unit. 2. Remove motor mount nuts and bolts. 3. Loosen fan motor nuts. See Fig. 39. 4. T urn motor jacking bolts to move motor mounting plate left or right for proper belt tension.
Crankcase Heater — Each compressor has a crankcase heater to 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 , main unit power must be on for the heaters to be energized.
TROUBLESHOOTING T ypical refrigerant circuiting diagrams are shown in Fig. 43-45. LEGEND FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch Fig.
LEGEND FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch Fig. 44 — T ypical Refrigerant Circuiting (50EJ,EK,EW ,EY038,044) 47.
LEGEND FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch Fig. 45 — T ypical Refrigerant Circuiting (50EJ,EW048) 48.
Diagnostic LEDs (Light-Emitting Diodes) — There are 3 LEDs (red, yellow , and green) on the lower right hand side of the control board. The red light is used to check unit operation and alarms. A constant pulse is normal unit operation. A series of quick blinks indicates an alarm.
T ables 21-23 show the input and output channel designations. T able 21 — I/O Channel Designations Base Module — CV TERMINAL NO. ASSIGNMENT T1-2 SPT (CCN) — 10K V Thermistor T3-4 STO (CCN) — 1.
T able 23 — I/O Channel Designations Expansion Module — CV and V A V TERMINAL NO. ASSIGNMENT T1-2 — T3-4 — T5-6 — T7-8 — T9-10 — T1 1-12 IAQ Indoor — AI (2-10 vdc) T13-14 IAQ Outdoor .
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P ACKAGED 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 • Installation Overview • Maintenance • Operating Sequence A lar ge selection of product, theory , and skills programs is available.
ST ART -UP CHECKLIST MODEL NO.: SOFTW ARE VERSION (SEE FIG. 15) DA TE: SERIAL NO.: TECHNICIAN: PRE-ST ART -UP: M VERIFY THA T DIP SWITCH SETTINGS ARE CORRECT M VERIFY THA T ALL P ACKING MA TERIALS HA .
ST ART -UP CHECKLIST (cont) GENERAL M ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS M ENSURE DRIVES OPERA TE WITHIN LIMITS OF F AN PERFORMANCE T ABLES HIGH-PRESSURE SWITCH SETTING PSIG LOW -PRESSURE SWITCH SETTING PSIG MOTOR PULLEY P AR T NUMBER F AN PULLEY P AR T NUMBER BEL T P AR T NUMBER BEL T SIZE in.
An important point after buying a device Carrier 50EW (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Carrier 50EW yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Carrier 50EW - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Carrier 50EW you will learn all the available features of the product, as well as information on its operation. The information that you get Carrier 50EW will certainly help you make a decision on the purchase.
If you already are a holder of Carrier 50EW, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Carrier 50EW.
However, one of the most important roles played by the user manual is to help in solving problems with Carrier 50EW. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Carrier 50EW along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
