Carrier 50EY User Manual

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

Table 1 — Physical Data (cont)UNIT 50EJ,EK,EW,EY 038 044 048NOMINAL CAPACITY (tons) 35 40 45OPERATING WEIGHT (lb)*UnitAl/Al† 4282 4508 4795Al/Cu† 4567

Table 2 — Evaporator Fan Motor DataUNITSIZEMOTORHPMOTORSHAFTDIAMETER(in.)FANSHAFTSPEED(rpm)MOTORSHEAVEMOTORSHEAVEPITCHDIAMETER(in.)BUSHINGDIAMETER(in.

Step 6 — Controls Options — The control optionsthat the units can provide are based on the following param-eters: CV (constant volume) or VAV (variabl

Features with sensor control of unit with computer accessare:• 365 day timeclock with backup (supports minute, hour,day of week, date, month, and year

Fig. 12 — Control Board DiagramLEGENDCCN — Carrier Comfort Network R—RelayCOM — Common SIO — Serial Input/OutputD—Diode SW — SwitchN.C. — Normally Clo

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

A31⁄2-in. NPT coupling for field power wiring and a3⁄4-in. NPT coupling for 24-v control wiring are provided inbasepan. In the side post, there are two

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER SUPPLYNo

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER S

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER S

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 t

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER S

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER S

Table 4 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER S

Table 3 — Electrical Data — 50EJ,EK,EW,EY024-048 (cont)UNITSIZENOMINALVOLTAGE(3 Ph 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWEREXHAUSTELECTRICHEAT*POWER S

DIP — Dual In-Line PackagePEC − Power Exhaust ControllerFig. 14 — Control Box Diagram (Sizes 024-034)DIP — Dual In-Line PackagePEC — Power Exhaust Con

Remote Field Control (Units Running Version 2.0 of UnitControl Software) — A switch closure across terminals Rand W1 on TB-3 will initiate the Occupie

NOTE: Before assembly of the economizer hood, check alongthe outer edges of the economizer assembly for any seal stripprotruding past the flanges. Trim

HOOD TOPHOOD SIDEFig. 21 — Adding Seal Strip toHood Top Mounting FlangeCROSS MEMBERGRAY FOAM STRIPFig. 22 — Adding Foam Strip to Cross MemberHOOD SIDE

Minimum Damper Position Setting — Setting of the out-door air damper position is performed in conjunction with ashortened version of the field-run test

Step 9 — Position Power Exhaust/BarometricRelief Damper Hood —All electrical connections havebeen made and adjusted at the factory. The power exhaustb

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 t

Step 10 — InstallAccessories — After all the factory-installed options have been adjusted, install all field-installed accessories. Refer to the access

Fig. 33B — MotormasterT III Sensor Location(Sizes 038 and 044)Fig. 33C — Motormaster III Sensor Location(Size 048)31

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

Power Exhaust — The optional non-modulating powerexhaust (CV only) is a two-stage design where the operationof the exhaust fans is linked to economize

Table 10A — DIP Switch Configuration (Version 1.0 of Unit Control Software)SETTING 1 2 3 4 5 6 7 8OPEN VAVCCN/SensorsExpansionI/O BoardFieldTestONModul

DIP switch configurations for Version 1.0 of the Unit Con-trol Software are as follows:• DIP switch 1 configures the unit to operate as a variableair vo

Table 12 — Fan Performance, 50EJ/EK024-034 — Vertical Discharge UnitsFOR EW/EY UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.3 IN. WGAIRFL

Table 13 — Fan Performance, 50EJ038,044 and 50EK044 — Vertical Discharge UnitsFor EW/EY UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.5 IN

Table 14 — Fan Performance, 50EJ048 — Vertical Discharge UnitsFOR EW UNITS, REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0.5 IN. WGAIRFLOW(Cfm)AVA

Table 16 — Motor LimitationsSTANDARD EFFICIENCY MOTORSNominalHpMaximumBhpMaximum AmpsMaximumWattsMotorEfficiency208 230 460 57555.9 17.94 16.99 — — 5,

NOTES:1. Weights include economizer (Std)2. Center of gravity.3. Do not locate adjacent units with dis-charge facing economizer inlet. Mini-mum cleara

The control module will operate economizer, run diag-nostics to monitor alarms/alerts at all times, and respond toCCN communications to perform any co

interlock relay signals for the air terminals to fully open. SeeFig. 35. In the Occupied mode, the indoor-fan motor willoperate continuously and the o

CAPACITY CONTROL, COOLING — The cooling capac-ity staging tables are shown in Tables 18 and 19.Table 18 — Cooling Capacity Staging TableCV Units with

Cleaning — Inspect unit interior at beginning of each heat-ing and cooling season and as operating conditions require.Remove unit top panel and/or sid

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.

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

TROUBLESHOOTINGTypical refrigerant circuiting diagrams are shown in Fig. 43-45.LEGENDFPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low

LEGENDFPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure SwitchFig. 44 — Typical Refrigerant Circuiting(50EJ,EK,EW,EY038,044)4

LEGENDFPS — Freeze Protection SwitchHPS — High-Pressure SwitchLPS — Low-Pressure SwitchFig. 45 — Typical Refrigerant Circuiting(50EJ,EW048)48

Diagnostic LEDs (Light-Emitting Diodes) — Thereare 3 LEDs (red, yellow, and green) on the lower right handside of the control board. The red light is

NOTES:1. Weights include economizer (Std)2. Center of gravity.3. Do not locate adjacent units with discharge facing economizer inlet. Mini-mum clearan

Tables 21-23 show the input and output channel designations.Table 21 — I/O Channel DesignationsBase Module — CVTERMINALNO.ASSIGNMENTT1-2 SPT (CCN) — 1

Table 23 — I/O Channel Designations ExpansionModule — CV and VAVTERMINALNO.ASSIGNMENTT1-2 —T3-4 —T5-6 —T7-8 —T9-10 —T11-12 IAQ Indoor — AI (2-10 vdc)T

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. 15)DATE:SERIAL NO.:TECHNICIAN:PRE-START-UP:M VERIFY THAT DIP SWITCH SETTINGS ARE CORRECTM VERIF

START-UP CHECKLIST (cont)GENERALM ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTSM ENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERF

NOTES:1. Weights include economizer (Std)2. Center of gravity.3. Do not locate adjacent units with discharge facing econo-mizer inlet. Minimum clearan

NOTES:1. Weights include economizer (Std)2. Center of gravity.3. Do not locate adjacent units with discharge facing economizer inlet.Minimum clearance

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. U

Table 1 — Physical DataUNIT 50EJ,EK,EW,EY 024 028 030 034NOMINAL CAPACITY (tons) 20 25 27 30OPERATING WEIGHT (lb)*UnitAl/Al† 4016 4102 4102 4102Al/Cu†