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SERVICE MANUAL
4SCU17LE
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer (or
equivalent), service agency or the gas supplier.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves
and protective clothing.
508260-01
WARNING
CAUTION
Table of Contents
Technical Specifications ..............................................2
Refrigerant Metering Device - Indoor Coil ...................7
Installation ...................................................................7
Refrigeration Piping ...................................................10
Electrical Wiring .........................................................19
Sequence of Operation..............................................20
Start-Up .....................................................................20
Maintenance ..............................................................21
Wiring Diagram ..........................................................22
Servicing Units Void of Charge ..................................24
System Refrigerant ....................................................24
Charge Labels ...........................................................27
Start-Up and Performance Checklist .........................28
Electric shock hazard.
Can cause injury or death. Before attempting
to perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
*P508260-01*
Issue 2237
WARNING
(P) 508260-01
Page 1 of 28
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Summary of Contents for Allied 4SCU17LE
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Page 1: Table Of Contents
SERVICE MANUAL 4SCU17LE This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. Table of Contents Technical Specifications ..........2 Refrigerant Metering Device - Indoor Coil ....7... -
Page 2: Technical Specifications
Technical Specifications MODEL NUMBER GUIDE 4 SCU 17 LE 1 36 P - 51 A Refrigerant Major Revision Code 4 = R410A Minor Revision Code Split Air Conditioner Electrical P - 208 - 230v/60hz/ 1-phase SEER Tonnage 18, 24, 30, 36, 41, 42, 47, 48, 59, 60 TIER LE = Louvered enhanced Region Restrictions... -
Page 3: Sound Ratings
SOUND RATINGS Estimated Sound Pressure (dBA) Approximate Distance Model Sound Power 3.3 Feet 6.6 Feet 9.8 Feet (1 Meter) (2 Meters) (3 Meters) 4SCU17LE118P 4SCU17LE124P 4SCU17LE130P 4SCU17LE136P 4SCU17LE141P 4SCU17LE142P 4SCU17LE147P 4SCU17LE148P 4SCU17LE159P 4SCU17LE160P 1 Rated in accordance with AHRI standard 270 (2015). AHRI Standard 270 establishes a method of rating outdoor unitary equipment in terms of Sound Power. -
Page 4: Refrigeration Data
REFRIGERATION DATA Outdoor Unit Indoor Unit Refrigerant Line Size Refrig. Connection Connection Model Piston Size Charge (oz.) * Suction Liquid Suction Liquid Suction Liquid 4SCU17LE118P 0.051 H4TXV01 4SCU17LE124P 0.059 H4TXV01 4SCU17LE130P 0.067 H4TXV01 4SCU17LE136P 0.072 H4TXV02 4SCU17LE141P H4TXV02 4SCU17LE142P 0.081 H4TXV02 4SCU17LE147P H4TXV02... - Page 5 FAN BLADE SPECS Fan Blade 4SCU17LE1*P Dia. #of Blades Pitch Part # 22" 23C06 22" 43W37 22" 27W58 22" 27W58 26" 32W31 26" 32W31 26" 32W31 22" 30W24 26" 23V43 26" 23V43 508260-01 Issue 2237 Page 5 of 28...
- Page 6 NOTE — Plumbing layout and compressor type may vary between model sizes. CONTROL COMPRESSOR DUAL RUN CAPACITOR THERMAL SWITCH GROUND LUG DISCHARGE LINE COMPRESSOR HARNESS CONNECTION CONTACTOR OUTDOOR COIL CUTOUT FOR HIGH VOLTAGE CONDUIT CONTROL WIRE LOOP CRANKCASE HEATER THERMOSTAT CRANKCASE HEATER SUCTION LINE SERVICE VALVE LIQUID LINE SERVICE VALVE...
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Page 7: Refrigerant Metering Device - Indoor Coil
Refrigerant Metering Device - Indoor Coil For correct metering device, refer to chart below. Indoor Indoor Outdoor Model Orifice Size Expansion Outdoor Model Orifice Size Expansion Device Device 4SCU17LE118P 0.051 H4TXV01 4SCU17LE142P 0.081 H4TXV02 4SCU17LE124P 0.059 H4TXV01 4SCU17LE147P H4TXV02 4SCU17LE130P 0.067 H4TXV01 4SCU17LE148P... -
Page 8: Elevate Unit
Discharge Air Building Structure 24” Mounting Slab 6”* Ground Level Mounting slab must slope slightly away from building, not to exceed 1/4” per foot. 30” around Control Figure 2. Slab Mounting NOTE: See Table 2 for specific minimum clearance guidelines. Elevate Unit Figure 3. -
Page 9: Torque Requirements
Torque Requirements Liquid and Suction Line Service Valves When servicing or repairing heating, ventilating, and The liquid line and suction line service valves (see Figure air conditioning components, ensure the fasteners are 4) and service ports are used for leak testing, evacuation, appropriately tightened. -
Page 10: Refrigeration Piping
Refrigeration Piping • Use only refrigerant grade copper tubes. • Split systems may be installed with up to 50 feet of line set (no more than 20 feet vertical) without special consideration (see long line set guidelines). • Ensure that vapor and liquid tube diameters are appropriate to capacity of unit. - Page 11 LINE SET IMPORTANT — Refrigerant lines must not contact structure. INSTALLATION REFRIGERANT LINE SET — INSTALLING Line Set Isolation — The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE — Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET —...
- Page 12 It is recommended that vertical suction risers not be up- STUB END sized. Proper oil return to the compressor should be TWO-PIECE PATCH PLATE LIQUID LINE (UNCASED COIL ONLY) maintained with suction gas velocity. ORIFICE EXPANSION HOUSING VALVE DISTRIBUTOR TUBES ®...
- Page 13 1. Connect gauges and equipment as shown in Figure 7. CYLINDER CONTAINING GAUGE CLEAN R-410A TO BE Set the recovery machine for liquid recovery and start MANIFOLD USED FOR FLUSHING the recovery machine. Open the gauge set valves to (Positioned to deliver liquid refrigerant) allow the recovery machine to pull a vacuum on the HIGH...
- Page 14 Refrigerant Piping - Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the Product Specifications for approved expansion valve kit match-ups and application information. The check expansion valve unit can be installed internal or external to the indoor coil.
- Page 15 Refrigerant Piping - Brazing Procedures CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the vapor and liquid line service of the line.
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Page 16: Braze Line Set
WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port. - Page 17 Leak Test and Evacuation LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port.
- Page 18 EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve...
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Page 19: Electrical Wiring
Ground unit at unit disconnect switch or to an earth Electrical Wiring ground. To facilitate conduit, a hole is in the bottom of the control box. Connect conduit to the control box All field wiring must be done in accordance with the National using a proper conduit fitting. -
Page 20: Sequence Of Operation
Refrigerant Charging Sequence of Operation CAUTION NOTE: The thermostat used may be electromechanical or electronic. Excessive amounts of liquid refrigerant entering the suction line can damage the compressor. When adding NOTE: Transformer in indoor unit supplies power (24 VAC) refrigerant, precautions must be taken to control the to the thermostat and outdoor unit controls. -
Page 21: Maintenance
cooling mode using the subcooling method and table NOTE: All unit table values are based on 70 to 80°F provided on the unit access panel. indoor return air temperature for cooling mode, and 65°F to 75°F return air temperature for heat mode. •... -
Page 22: Wiring Diagram
Wiring Diagram OUTDOOR DUAL TIMED OFF CAPACITOR TO 24 VAC POWER PURPLE CONTROL SOURCE BLACK 20 VA MINIMUM ORANGE NEC CLASS 2 YELLOW BLACK BLACK COMPRESSOR COMPRESSOR CONTACTOR GROUND CRANKCASE 208-230/ 60/ 1 HEATER GROUND YELLOW BLACK YELLOW YELLOW K1-1 208-230/ 60/ 1 HIGH PRESSURE... - Page 23 OUTDOOR DUAL TIMED OFF CAPACITOR TO 24 VAC POWER GREEN CONTROL SOURCE 20 VA MINIMUM NEC CLASS 2 YELLOW BLACK BLACK COMPRESSOR COMPRESSOR CONTACTOR GROUND CRANKCASE 208-230/ 60/ 1 HEATER GROUND YELLOW BLACK YELLOW YELLOW K1-1 208-230/ 60/ 1 HIGH PRESSURE SWITCH GROUND...
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Page 24: Servicing Units Void Of Charge
Servicing Units Void of Charge System Refrigerant If the outdoor unit is void of refrigerant, clean the system This section outlines procedures for: using the procedure described below. Connecting gauge set for testing and charging; Leak check system using procedure outlined on Page Checking and adjusting indoor airflow;... -
Page 25: Indoor Coil
Adding or Removing Refrigerant This system uses HFC-410A refrigerant which operates at much higher pressures than HCFC-22. The pre-installed liquid line filter drier is approved for use with HFC-410A only. Do not replace it with components designed for use with HCFC-22. This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device. - Page 26 °F °C Psig °F °C Psig -40.0 11.6 15.6 170.0 -37.2 14.9 18.3 185.0 -34.4 18.5 21.1 201.0 -31.7 22.5 23.9 217.0 -28.9 26.9 26.7 235.0 -26.1 31.7 29.4 254.0 -23.3 36.8 32.2 274.0 -20.6 42.5 35.0 295.0 -17.8 48.6 37.8 317.0 -15.0...
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Page 27: Charge Labels
Charge Labels Figure 12. 4SCU17LE Charge Label 508260-01 Issue 2237 Page 27 of 28... -
Page 28: Start-Up And Performance Checklist
Start-Up and Performance Checklist Job Name _________________________________________ Job no. _____________________________ Date ________________ Job Location ____________________________________________ City ______________________ State ____________________ Installer ________________________________________________ City ______________________ State ____________________ Unit Model No. _____________________ Serial No. __________________________ Service Technician ____________________ Nameplate Voltage __________________________________________________________________________________________ Rated Load Ampacity ________________ Compressor _______________________ Outdoor Fan ________________________ Maximum Fuse or Circuit Breaker _______________________________________________________________________________ □...
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