Emerson Liebert SRC18 User Manual
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Emerson Liebert SRC18 User Manual

Mini-split cooling system
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Liebert
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User Manual—Mini-Split Cooling System

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Summary of Contents for Emerson Liebert SRC18

  • Page 1 Liebert ® ™ User Manual—Mini-Split Cooling System...

  • Page 3: Table Of Contents

    Table of Content Important Safety Instructions........1 Safety Symbols .
  • Page 4 5.2 Piping Materials and Handling..........38 5.2.1 Brazing Practices .
  • Page 5 6.4 Connecting Indoor Unit Electrical Wiring........75 6.4.1 Terminal-block Connection for SRC18 .
  • Page 6 8.6 Function Settings............97 8.6.1 Setting Louver Angle Control .
  • Page 7 List of Figures Figure 1-1: Product Nomenclature ............. . 9 Figure 2-1: Indoor Unit Parts and Functions .
  • Page 8 Figure 5-19: Correct slope angle for drain hose ..........53 Figure 5-20: Incorrect methods of routing drain hose .
  • Page 9 Figure 8-1: On/Off button location ............. 91 Figure 9-1: Cleaning the outside of the indoor unit .
  • Page 10 List of Tables Table 2-1: Unit electrical data..............16 Table 5-1: Flared-connection dimensions .

  • Page 11: Important Safety Instructions

    Important Safety Instructions Important Safety Instructions SAVE THESE INSTRUCTIONS Do not throw away, destroy or lose this manual. Please read carefully and store in a safe place for future reference. Content familiarity required for proper installation. The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or other people.
  • Page 12 Important Safety Instructions WARNING Risk of improper installation. Can cause equipment and building damage, injury or death. Utilize a structural engineer to evaluate the mounting surface and environmental risks and recommend the safest fastening method. WARNING Risk of protective safety devices not operating properly. Can cause electrical short circuit, electric shock, explosion, fire, injury or death.
  • Page 13 Important Safety Instructions WARNING Risk of electric shock. Can cause injury or death. Secure all hazardous voltage field wiring connections with appropriate wire strain relief. Improperly secured wires will create excessive stress on electrical power connection lugs. Improper or loose connections may generate excessive heat and cause smoke and fire. WARNING Risk of damaged electrical components and short circuits.
  • Page 14 Important Safety Instructions CAUTION Risk of contact with extremely hot and cold surfaces. Can cause injury. Refrigerant piping is extremely hot or cold during unit operation. Do not touch the refrigerant piping during or after operation. Wear thermally insulated gloves and arm protection or allow the piping to cool or warm to a safe handling temperature before working on the piping.
  • Page 15 Important Safety Instructions NOTICE Risk of using the wrong refrigerant. Can cause equipment damage Do not make refrigerant substitutions. Use R410A only. If a different refrigerant is used, or air mixes with original refrigerant, the unit will malfunction and be damaged. NOTICE Risk of excessive vibration and water leakage.
  • Page 16 Important Safety Instructions NOTE Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable U.S. Environmental Protection Agency (EPA) rules. NOTE Don’t store or use flammable gas / combustibles near the unit. There is risk of product failure.

  • Page 17: Safety Symbols

    Safety Symbols Safety Symbols The following symbols may appear within the documentation or on the product. Symbol Meaning High Temperature Alerts the user where the enclosure temperature may exceed 158°F (70°C) while operating under high- ambient temperature and at maximally rated load. Instructions Signifies the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
  • Page 18 Safety Symbols Page intentionally left blank. ® ™ Liebert User Manual...

  • Page 19: Model Number And Nomenclature

    Model Number and Nomenclature 1.0 Model Number and Nomenclature Figure 1-1 Product Nomenclature Example: SRC24 HPN000 Placeholder Placeholder Voltage Nominal Capacity (in Btu/h) P = 208 – 230/1/60 12 = 12,000 18 = 18,000 24 = 24,000 36 = 36,000 Unit Type Revision AHRI Type...
  • Page 20 Model Number and Nomenclature Page intentionally left blank. ® ™ Liebert User Manual...

  • Page 21: Product Introduction

    Product Introduction 2.0 Product Introduction Suggestions for Energy Saving when Operating the Liebert SRC: • Do not cool excessively indoors. This may be harmful for your health and may consume more electricity. • Block sunlight with blinds or curtains while you are operating the unit. •...

  • Page 22: Figure 2-3 Thermostat Parts And Functions

    Product Introduction NOTE The number and location of operation lamps may vary by unit model. The features may vary by model. Figure 2-3 Thermostat parts and functions Description Description Operation indication Air-flow button Set temperature button Cooling temperature setpoint Fan speed button Function setting button Set back button Up, down, left and right buttons...

  • Page 23: Figure 2-5 Icon Descriptions And Functions

    Product Introduction NOTE Some options and functions may not be displayed or the menu name may be different depending on your system and model. Figure 2-5 Icon descriptions and functions Section Icon Description Auto—change to cooling or heating mode automatically. Operating in cooling mode.
  • Page 24 Product Introduction Section Icon Description Current temperature. 3 Temperature Cooling temperature setpoint. Heating temperature setpoint. 4 Fan Speed Fan-speed settings. Swing louvers up/down. 5 Air-flow/Louvers Swing louvers left/right. Swing louvers for “swirl” (paired, opened cross swing). Operate in schedule mode. Temporarily operate in a mode.
  • Page 25 Product Introduction Section Icon Description Day of Week: • SUN = Sunday • MON = Monday • TUE = Tuesday • WED = Wednesday • THU = Thursday • FRI = Friday • SAT = Saturday Number of the weekly-schedule event. 9 Schedule Set-up Schedule time AM/PM.

  • Page 26: Electrical Data

    Product Introduction Section Icon Description Louver set-up. 1, 2, 3, 4, All = louver number. STD = standard louver angle setting. Angle of the louver. Elevation grill set-up. Grill up. Grill closed. Grill down. Display lock set-up 10 Function Settings Display is locked.

  • Page 27: R410A Refrigerant

    Product Introduction 2.2 R410A Refrigerant R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant and, therefore, all piping-system materials installed must have a higher resisting pressure that the materials traditionally used in R22 systems. R410A refrigerant is an azeotrop of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is zero.
  • Page 28 Product Introduction Page intentionally left blank. ® ™ Liebert User Manual...

  • Page 29: Installation

    Installation 3.0 Installation 3.1 Selecting the Location for the Outdoor Unit WARNING Risk of improper installation. Can cause serious injury or death. • To avoid the possibility of fire, do not install the unit in an area where combustible gas may generate, flow, stagnate, or leak.

  • Page 30: Ambient Air Conditions

    Installation Installation location of the outdoor unit can affect indoor-unit operation. The indoor unit may take longer to provide heat, or heating performance will be reduced in winter in the outdoor unit is installed: • In a narrow, shady location. •...

  • Page 31: Figure 3-1 Oceanside Placement Using A Windbreak

    Installation Figure 3-1 Oceanside placement using a windbreak Description Windbreak Sea wind ® Liebert SRC™ User Manual...

  • Page 32: Figure 3-2 Oceanside Placement Using A Building

    Installation Using a Building to Shield the Unit from Sea Wind If a windbreak is not possible, a building or larger structure must be used to shield the outdoor unit from direct exposure to the sea wind. The unit should be placed on the side of the building directly opposite to the direction of the wind as shown in Figure 3-2.

  • Page 33: Mounting The Outdoor Unit

    Installation 3.2 Mounting the Outdoor Unit Securely attach the outdoor unit to a condenser pad, base rails, or another mounting platform that is securely anchored to the ground or building structure. Attach the outdoor unit with a bolt and nut on a concrete or rigid mount.

  • Page 34: Snow And Ice Conditions

    Installation 3.2.3 Snow and Ice Conditions In climates that experience snow build-up, place the unit on a raised platform to ensure condenser air flow. The raised support platform must be high enough to allow the unit to remain above possible snow drifts. Mount the unit on a field-provided snow stand at a minimum height that is equal to the average annual snowfall plus 20 inches.

  • Page 35: Figure 3-5 Outdoor-Unit Sunroof/Awning Clearances

    Installation Figure 3-5 Outdoor-unit sunroof/awning clearances More than More than More than More than Unit: Inch Figure 3-6 Clearances when there are obstacles on both air-inlet and air-outlet sides Unit: Inch NOTE In Figures 3-6 and 3-7, the obstacle on the outlet side is lower than the outdoor unit.

  • Page 36: Indoor Unit Clearance

    Installation 3.3.2 Indoor Unit Clearance Follow recommended practices when choosing an indoor location for the wall-mounted indoor unit. • Keep unit away from any indoor steam or excessive heat. • No obstacles should be placed around the unit. • Condensation drain (leakage piping) should be routed away from the unit. •...

  • Page 37: Figure 3-9 Installation-Plate Screws For Src18

    Installation 1. Before installation of the plate, confirm the position of the screw types (A or B) between the chassis and the installation plate, Figure 3-9. Figure 3-9 Installation-plate screws for SRC18 A-Type B-Type 2. Depending on indoor-unit model refer to Figure 3-10 and mount the plate as follows: •...

  • Page 38: Mounting The Installation Plate To The Wall (Src24, Src36)

    Installation 3.4.2 Mounting the Installation Plate to the Wall (SRC24, SRC36) WARNING Risk of electrical shock. Can cause injury or death. • When choosing a location for the wall-mount plate, be sure to take into consideration routing of wiring for power outlets within the wall. Avoid contact with hazardous voltage wiring. •...

  • Page 39: Drilling A Piping Hole In The Wall

    Installation 3.4.3 Drilling a Piping Hole in the Wall Follow the left or right piping-clearance recommendations. 1. Using a 2-5/8 in. (0.65 mm) hole-core drill bits, drill a hole at either the right or left side of the wall mounting, Figure 3-13. •...

  • Page 40: Prepare For Piping/Electrical Connection

    Installation 3. Move the bottom of the unit toward the installation plate to anchor to wall, Figure 3-15. • It helps to press the lower-left and -right sides of the unit against the installation plate until the hooks engage in their slots. •...

  • Page 41: Pump Down Procedure

    Installation 3. Refer to 5.0 - Piping, to continue with the piping connections to the indoor unit. – or – Refer to 6.0 - Electrical Connections, to continue with the conduit/electrical wiring to the indoor unit. Figure 3-17 Rear view of indoor unit Installa on Plat e Drain Hose Drain Hose Holder...
  • Page 42 Installation 3. Purge the air in the manifold hose using the refrigerant. 4. Close the liquid line service valve completely. 5. Turn on the cooling-unit’s power switch and start cooling-mode operation, 8.3 - Enabling Cooling- only Mode. 6. Observe the pressure gauge reading. •...

  • Page 43: Installation Checklist

    Installation Checklist 4.0 Installation Checklist Major Component Rough-in ___ 1. Unit was connected properly per local code and the product installation procedures. ___ 2. All literature and bagged accessories have been removed from the fan discharge. ___ 3. Indoor unit was installed, properly supported, and located indoors in a non-corrosive environment. ___ 4.
  • Page 44 Installation Checklist Power Wire and Communication Cables ___ 1. Power wiring was connected to a single-phase 208 – 230-V source. ___ 2. Ground wire was installed and properly terminated at the unit. ___ 3. The power supplied was clean with voltage fluctuations with specifications. (±10% of nameplate). ___ 4.

  • Page 45: Piping

    Piping 5.0 Piping 5.1 Piping Preparation WARNING • Do not allow the refrigerant to leak during brazing. If the refrigerant is combusted, it generates a toxic gas that can cause physical injury or death. • Do not braze in an enclosed location, and always test for gas leaks before/after brazing. •...

  • Page 46: Figure 5-1 Creating A Flared Fitting

    Piping Figure 5-1 Creating a flared fitting Figure 19: Creating a Flare Fitting Copper Slanted Uneven Rough tube 90° Pipe Flare nut Copper Reamer tube Point down Handle "A" Yoke Cone Copper pipe Clamp handle Red arrow Inside is shiny with no scratches Smooth Incorrect Flares Slanted...

  • Page 47: Tightening Flare Nuts

    Piping 4. Carefully inspect the flared pipe end. • Compare the geometry with Figure 5-1 and the dimensions detailed in Figure 5-2 and Table 5-1. Figure 5-2 Flared-connection dimensions 90° R=0.4~0.8 Table 5-1 Flared-connection dimensions Pipe “A” Thickness Vapor (in. O.D.) Liquid (in.

  • Page 48: Loosening Flare Nuts

    Piping 5.1.3 Loosening Flare Nuts Always use 2 wrenches to loosen the flare nuts. 5.2 Piping Materials and Handling Pipes used for the refrigerant piping system must include the specified thickness, and the interior must be clean. While handling and storing, do not bend or damage the pipes, and take care not to contaminate the interior with dust, moisture, etc.

  • Page 49: Brazing Practices

    Piping 5.2.1 Brazing Practices NOTE It is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust during installation. Contaminants can result in mechanical failure of the system. All joints are brazed in the field. Refrigeration-system components contain very small capillary tubes, small orifices, electronic expansion valves, oil separators, and heat exchangers that can easily become blocked.

  • Page 50: Refrigerant-Piping System Insulation

    For specific insulation procedures, see 5.4 - Piping Insulation. 5.2.3 Selecting Field-supplied Copper Tubing Copper is the only approved refrigerant-pipe material for use with the Liebert SRC, and Emerson recommends seamless phosphorous deoxidized ACR type copper pipe, hard-drawn rigid type “K” or “L,” or annealed-tempered, copper pipe.

  • Page 51: No Pipe Size Substitutions

    Piping Table 5-5 Piping-tube thickness OD (in.) 1-1/8 1-3/8 1-5/8 Material Rigid type “K” or “L” and a soft ACR acceptable Rigid type “K” or “L” only Min. Bend .563 .9375 2.25 Radius (in.) Min. Wall Thickness .035 .040 .042 .045 .050 .050...

  • Page 52: Obstacles

    Piping 5.2.5 Obstacles When an obstacle, such as an I-beam or concrete T, is in the path of the planned refrigerant-pipe run, it is best practice to route the pipe over the obstacle. If adequate space is not available to route the insulated pipe over the obstacle, then route the pipe under the obstacle.

  • Page 53: Table 5-7 Linear Thermal Expansion Of Copper Tubing, In Inches

    Piping 3. Calculate the difference in the two expansion distance values. The result is the anticipated change in pipe length. Table 5-7 Linear thermal expansion of copper tubing, in inches Fluid Temperature, °F Pipe Length 35° 40° 45° 50° 55° 60°...

  • Page 54: Pipe Bends

    Piping Figure 5-7 Coiled expansion loops and offsets Large Tubing U-bend (>3/4 in.) Loop Small Tubing U-bend (<3/4 in.) Table 5-8 Radii of coiled expansion loops and developed lengths of expansion offsets Anticipated Linear Nominal Tube Size (OD) in. Expansion (LE) (in.) 1-1/2 2-1/2...

  • Page 55: Field-Provided Isolation Ball Valves

    5.2.9 Field-provided Isolation Ball Valves Emerson allows the installation of field-supplied ball valves with Schrader ports at each indoor unit. Full- port isolation ball valves with Schrader ports (positioned between valve and indoor unit) rated for use with R410A refrigerant should be used on both the liquid and vapor lines.

  • Page 56: Figure 5-9 Typical Pipe-Support Location For A Change In Pipe Direction

    Piping A properly-installed pipe system has sufficient supports to prevent pipes from sagging during the life of the system. As necessary, place supports closer for segments where potential sagging could occur. Maximum spacing of the pipe supports must meet local codes. If local codes do not specify pipe-support spacing, support the pipes as follows: •...

  • Page 57: Pipe Sleeves At Penetrations

    Piping 5.2.12 Pipe Sleeves at Penetrations Emerson requires that all pipe penetrations through walls, floors, and pipes buried underground be properly-insulated and routed through an appropriate wall sleeve of sufficient size to prevent compression of refrigerant-pipe insulation and free movement of the pipe withing the sleeve, Figure 5-10.

  • Page 58: Underground Refrigerant Piping

    Piping 5.2.13 Underground Refrigerant Piping Refrigerant pipe installed underground should be routed inside a vapor-tight protective sleeve to prevent deterioration of the insulation and water infiltration. Refrigerant pipe installed inside underground casing must be continuous without any joints. Underground refrigerant pipe must be located at a level below the frost line.

  • Page 59: Piping Connections

    Piping 5.3 Piping Connections 5.3.1 Connection Limitations Liebert SRC systems consist of one outdoor unit and one indoor unit. One of the most critical elements of a system is the refrigerant piping. Table 5-12 lists pipe-length limits that must be followed in the design of an SRC system.

  • Page 60: Piping Connections Layout

    Piping 5.3.2 Piping Connections Layout Liebert SRCs are a 1-to-1 system. There is a direct piping connection between the outdoor unit and the indoor unit. Figure 5-13 illustrates the basic pipe connections between the outdoor and indoor unit. Refer back to this illustration as you proceed with pipe connection. Figure 5-13 shows the indoor unit installed at a higher position than the outdoor unit.

  • Page 61: Pipe Bundling

    Piping 5.3.2.1 Pipe bundling Refer to Figure 5-15 for proper cable and pipe bundling. Note the placement of the piping along with the necessary insulation material. Figure 5-15 Proper pipe and cable bundling—cut-away Vapor Line Insulation Material Liquid Line Pipe Sleeve Insulation Material Min.

  • Page 62: Bundling And Trap When Indoor Unit Is Above Outdoor Unit

    Piping 5.3.2.2 Bundling and Trap when Indoor Unit is above Outdoor Unit 1. Refer to Figure 5-17, and tape the piping, drain hose, and connection cable from down to up. 2. Secure the taped piping along the exterior wall using pipe clamps. 3.

  • Page 63: Routing The Drain Hose For Indoor Unit

    Piping 5.3.3 Routing the Drain Hose for Indoor Unit Drain hose is routed from the indoor unit, through the structure (wall) to the outdoors. The hose should slope at an angle where it is higher at the indoor unit and lower at the outdoor area, letting gravity push condensation down and out.

  • Page 64: Installing A Drain Hose On The Outdoor Unit

    Piping 5.3.4 Installing a Drain Hose on the Outdoor Unit Depending on the installation site, it may be necessary to install a drain plug (factory-supplied). 1. Depending on your unit model, refer to Figure 5-21 or 5-22 and to Table 5-13 for the drain-connection components.

  • Page 65: Connecting Piping On The Scr18 Outdoor Unit

    Piping 5.3.5 Connecting Piping on the SCR18 Outdoor Unit 1. Remove the tubing cover by loosening the fastening screws, Figure 5-23. NOTE Do not thread liquid or gas piping through bracket used to hold main power cables. Figure 5-23 Removing connection cover from SRC18 outdoor unit Tubing Cover Bracket for Main Power Cables...

  • Page 66: Figure 5-25 Correct Piping Attachment For Src18 Outdoor Unit

    Piping 5. Following the torque guidelines in Figure 5-14, finish tightening the flare nut with a torque wrench until the wrench clicks referring to Table 5-25 for correct connection points. NOTE When tightening the flare nut with a torque wrench, make sure the direction for tightening follows the arrow on the wrench.

  • Page 67: Connecting Piping On The Scr24 And Scr36 Outdoor Unit

    Piping 5.3.6 Connecting Piping on the SCR24 and SCR36 Outdoor Unit 1. Remove the tubing cover by loosening the fastening screws, Figure 5-26. NOTE When tightening the flare nut with a torque wrench, make sure the direction for tightening follows the arrow on the wrench. Figure 5-26 Removing connection cover from SRC24 and SRC36 outdoor unit Terminal Block Terminal...

  • Page 68: Figure 5-28 Correct Piping Attachment For Src24 And Src36 Outdoor Unit

    Piping 5. Following the torque guidelines in Table 5-15, finish tightening the flare nut with a torque wrench until the wrench clicks referring to Figure 5-28 for correct connection points. NOTE When tightening the flare nut with a torque wrench, make sure the direction for tightening follows the arrow on the wrench.

  • Page 69: Connecting Piping On The Indoor Unit

    Piping 5.3.7 Connecting Piping on the Indoor Unit While following this procedure, refer to 5.3.2.1 - Pipe bundling for specific bundling instructions, and to 5.3.3 - Routing the Drain Hose for Indoor Unit for proper drainage slope during piping. 1. Pull the screw cap at the bottom of the indoor unit. 2.

  • Page 70: Figure 5-30 Bending Drain Tubing At Rear Of Indoor Unit

    Piping 3. From the rear of the indoor unit, pull the tubing holder away from the unit as shown in Figure 5-30. 4. Remove the pipe port cover. 5. Position the tubing by unfolding the tubing and bending the tubing slowly downward first, as shown in Figure 5-30.

  • Page 71: Figure 5-32 Correct Cutting Line Placement

    Piping 7. Make sure the tube cutting line is placed upward, Figure 5-32. Figure 5-32 Correct cutting line placement Cutting Line Cutting Line Gas Pipe Liquid Pipe Correct Incorrect 8. Use narrow type vinyl tape, and make sure that the section placed in the rear pipe housing is wrapped sufficiently.

  • Page 72: Figure 5-34 Bundling Pipe And Drain Hose At Rear Of Indoor Unit

    Piping 10. Using a wider vinyl tape, bundle the piping and the drain hose together, Figure 5-34. • The tape should cover the piping and fit into the rear pipe housing on the back of the indoor unit as shown in Figure 5-35. Figure 5-34 Bundling pipe and drain hose at rear of indoor unit Wrap with vinyl tape Pipe...

  • Page 73: Piping Insulation

    Piping 5.4 Piping Insulation To prevent heat loss/heat gain through the refrigerant piping, all refrigerant piping, including liquid lines and vapor lines, must be insulated separately. Insulation must be a minimum 1/2-in. thick, and the thickness may need to be increased based on ambient conditions and local codes. All refrigerant piping, including field-supplied isolation ball valves, service valves, and elbows must be completely insulated using closed- cell pipe insulation.

  • Page 74: Figure 5-37 Typical Butt-Joint Insulation At Indoor Unit

    Piping Figure 5-37 Typical butt-joint insulation at indoor unit Surface of Field-Provided Indoor Unit Casing Pipe Insulation Figure 5-38 Typical refrigerant flare-fitting insulation Field-Provided Pipe Insulation ® ™ Liebert User Manual...

  • Page 75: Minimum Requirements For Wall Thickness Of Ethylene Propylene Diene Methylene (Epdm) Pipe Insulation

    Piping 5.4.1 Minimum Requirements for Wall Thickness of Ethylene Propylene Diene Methylene (EPDM) Pipe Insulation NOTE Follow local codes when selecting EPDM insulation wall thickness. Table 5-16 Insulation guidelines for typical and special circumstances Air-conditioned location Non-air-conditioned location 1. Typical 2.

  • Page 76: Air Purging

    Piping 5.5 Air Purging Air purging is performed after all piping is connected between the indoor and the outdoor unit. This step is necessary to be sure that air refrigerant can flow through the system without the danger of leakage or pressure issues.

  • Page 77: Piping Leak Test

    Piping 4. Set-up the purging-hose connections, Figure 5-40. Figure 5-40 Evacuation set up Indoor Unit Outdoor Unit Piping Bundl e Manifold Valve Pressure Lo Hi Gauge Lo=Open Hi=Close Charge Hose Vacuum Pum p 5. Do a leak test per 5.5.1 - Piping Leak Test. •...

  • Page 78: Connecting The Pressure Gauge

    Piping 5.5.1.1 Connecting the pressure gauge NOTE • To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be higher than its bottom when you pressurize the system. • Be sure the cylinder is used in a vertical standing position. 1.

  • Page 79: Ambient Temperature For Leak Test

    Piping 5.5.1.3 Ambient Temperature for Leak Test If the ambient temperature changed between the time when the pressure was applied and when the pressure-drop was checked, adjust the results by factoring-in approximately 1.45 psi for each 2°F of temperature difference. Correction formula = (Ambient temperature when pressure was applied –...

  • Page 80: Removing Purge And Test Equipment

    Piping 5.5.3 Removing Purge and Test Equipment When evacuation is completed, turn-off all valves a t the outdoor unit and safely disengage the manifold valve and vacuum pump using the following steps. 1. Using a wrench, turn the valve of the liquid stem counter-clockwise to fully open the valve, Figure 5- 40, page 67.

  • Page 81: Electrical Connections

    Electrical Connections 6.0 Electrical Connections WARNING Arc flash and electric shock hazard. Can cause serious injury or death. Open all local and remote electric power disconnect switches, verify with a voltmeter that power is off and wear personal protective equipment per NFPA 70E before working within the electric control enclosure. WARNING Risk of electric shock and overheated wiring.

  • Page 82: Figure 6-1 Indoor And Outdoor Wiring And Communications Cable Diagram

    Electrical Connections Figure 6-1 Indoor and Outdoor wiring and communications cable diagram Line Voltage (208/230V) For 9/12K Indoor Units: AWG 14 For 18K Indoor Units: AWG 12 Power Wiring, Ground to Outdoor Unit For 9/12/18K Indoor Units: AWG 18 Power Wiring, Ground, Communication Cable From Outdoor Unit To Indoor Unit...

  • Page 83: Figure 6-3 Proper And Improper Power-Wiring Connections

    Electrical Connections If ring terminals or space clips are not available then: WARNING Risk of improper electrical connection termination. Can cause building and equipment damage, excessive heat at the terminations, smoke, fire, electric shock, serious injury and death. Do not terminate different gauge wires to the power terminal block. Slack in the wiring may generate heat and fire.Do not ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building.

  • Page 84: Communication-Cable Specifications

    Electrical Connections 6.2 Communication-cable Specifications • Use a 4 conductor, shielded, stranded cable between the outdoor unit and the indoor unit. • Minimum 18-gauge shielded CVVS or CPEVS cable. • Insulation materials as required by local code. • Rated for continuous exposure of temperatures up to 140°F. •...

  • Page 85: Connecting Indoor Unit Electrical Wiring

    Electrical Connections 6.4 Connecting Indoor Unit Electrical Wiring The general guidelines for connecting electrical and communication cables to the indoor unit are the same for each system. However, the actual connections on the terminal block will differ. Refer to the figures for the model that you are wiring for correct contact on each terminal block.

  • Page 86: Figure 6-5 Remove Screws From Bottom Panel

    Electrical Connections 2. Using a Phillips-head screwdriver, remove the screws from the bottom panel of the indoor unit, Figure 6-5 and set the bottom panel aside, Figure 6-6. • The electrical/communication wiring is usually routed through the back/bottom of the indoor unit through a knockout panel, Figure 6-7.

  • Page 87: Terminal-Block Connection For Src18

    Electrical Connections 3. Using a screwdriver, connect the wires as shown in Figure 6-8. • Attach each wire securely to the terminal block. • Pay attention to the location/connection of the green/yellow ground cable. Figure 6-8 Indoor-unit terminal block with grounding cable (example only) 6.4.1 Terminal-block Connection for SRC18 NOTE...

  • Page 88: Terminal-Block Connection For Src24, Src36

    Electrical Connections 6.4.2 Terminal-block Connection for SRC24, SRC36 Figure 6-10 SRC24 and SRC36 indoor unit terminal-block connections Control Cover Indoor Unit Electrical Wiring Knockout Bottom Panel 1(L1) 2(L2) Grounding Cable 1(L ) 2 (N ) Power Connection Cable 6.5 Connecting Outdoor Unit Electrical Wiring The general guidelines for the electrical and communication cables to the outdoor unit are the same for each system.

  • Page 89: Figure 6-11 Src18 Outdoor-Unit Terminal-Block Connections

    Electrical Connections 5. Using a screwdriver, refer to Figure 6-11 or Figure 6-12, and connect the wires as follows: • Securely attach each wire to the terminal block. • Bundle cabling using a cable restrainer. • Pay attention to the location/connection of the green/yellow grounding cable. In some models, the connection is located on the side of the actual terminal block.

  • Page 90: Figure 6-12 Src24 And Src36 Outdoor-Unit Terminal-Block Connections

    Electrical Connections Figure 6-12 SRC24 and SRC36 outdoor-unit terminal-block connections 1(L1) 2(L2) 1(L1) 2(L2) Outdoor Unit Terminal Block Ov er 0.2” Power Cord Conduit Panel Connection/Communication Cable (Leading to Indoor Unit) Conduit Panel Cover 6. Use a recognized circuit breaker between the power source and the unit. A disconnecting device to adequately disconnect all supply lines must be fitted.

  • Page 91: Thermostat Installation And Wiring

    Electrical Connections 6.6 Thermostat Installation and Wiring NOTICE Risk of improper thermostat installation. Can cause unit malfunction. • Installation work must be performed in accordance with the national wiring standards and local code by authorized personnel only. • If local electric and building code requires plenum(CMP) cable, use an enclosed, non- combustible conduit (metal raceway) or FT-6 rated or above cable.

  • Page 92: Figure 6-15 Cable-Entry Hole/Guide Grooves

    Electrical Connections 1. Once the proper location for the thermostat is determined, determine the cable-entry location from one of three options: • Back • Top • Right 2. If you use top or right-side entry, remove the cable-guide groove from the back plate with long-nose pliers, Figure 6-15.

  • Page 93: Figure 6-17 Mounting Thermostat Onto Back Plate

    Electrical Connections 4. Making sure that the cable does not interfere, place the upper part of the thermostat on the back plate as shown in Figure 6-17, and press the lower part onto the back plate to connect it. • Leave no gaps between the thermostat and the back plate. •...

  • Page 94: Figure 6-19 Thermostat Cable Prep

    Electrical Connections Figure 6-19 Thermostat cable prep 0.394 inch(10mm) ± 0.118 inch(3mm) 7. Connect the wires to the thermostat terminal block and the indoor-unit terminal block as shown in Figure 6-20. • Tighten securely and make sure wires are not touching each other. Figure 6-20 Thermostat and Indoor unit terminal-block connections Thermostat PCB Indoor unit...

  • Page 95: Installation Set-Up And System Start-Up

    Installation Set-up and System Start-up 7.0 Installation Set-up and System Start-up NOTICE Risk of improper thermostat installation. Can cause unit malfunction. The Installer setting mode sets up the detailed function of the thermostat. If the installation is not set correctly, it can cause problems for the product, user injury, or property damage.

  • Page 96: Running Test Mode

    Installation Set-up and System Start-up Table 7-1 General unit functions—Installer set-up codes (continued) Function Code Description Value 00 = Slave 01 = Master Master setting (only “Plus 1 series models) 00 = Group 01 = Single 00 = Slave Override setting 01 = Master 00 = Auto-off Dry contact...

  • Page 97: Setting The Address Of Central Control

    Installation Set-up and System Start-up 2. Press The test run starts. • During the test run, pressing any of the following buttons will exit the test: Oper Mode, Temp up/down, Fan Speed, Wind Direction, or Start/Stop. 7.3 Setting the Address of Central Control Refer to Table 7-1 for the specific function-setting values.

  • Page 98: Setting The Thermistor

    Installation Set-up and System Start-up 5. Press then to select the next Step. 6. Press to select the Value, then use to select the setting. 7. Repeat Steps 5 to 6 until the strength is set for each wind level. 8.

  • Page 99: Setting The Ceiling Height

    Installation Set-up and System Start-up 7.6 Setting the Ceiling Height Refer to Table 7-1 for the specific function-setting values. 1. On the thermostat, press for at least 3 seconds. The function code blinks in the lower-middle of the display. NOTE A press less than 3 seconds enters “user”...

  • Page 100: Setting Optional Functions

    Installation Set-up and System Start-up 7.8 Setting Optional Functions Used when options are added or removed. Refer to Table 7-1 for the specific function-setting values. 1. On the thermostat, press for at least 3 seconds. The function code blinks in the lower-middle of the display. NOTE A press less than 3 seconds enters “user”...

  • Page 101: Operation

    Operation 8.0 Operation 8.1 Operating the Unit Use the ON/OFF button on the indoor unit to operate the system. 1. Depending on the type of unit, Type 1 or Type 2 (Figure 8-1), open the front cover. 2. Press the ON/OFF button. NOTE •...

  • Page 102: Automatic Unit Restart

    Operation 8.2 Automatic Unit Restart When the unit is turned-on after a power failure, this function restores the previous settings. NOTE Auto-restart may be changed depending on the type of model. Disabling Auto Restart 1. Open the front cover of the indoor unit. 2.

  • Page 103: Disabling Cooling-Only Mode

    Operation 8.4 Disabling Cooling-only Mode Cooling-only mode is used when performing the Pump Down procedure. Once pump-down is complete, disable cooling-only and return to normal operation using the following procedure. 1. Completely shut-down system power. 2. At the thermostat, access Installer mode by pressing for at least 3 seconds.

  • Page 104: Selecting Heating Mode

    Operation 8.5.3 Selecting Heating Mode 1. On the thermostat, press to power-on the indoor unit. 2. Press until displays in the operation-mode section. 3. Adjust the temperature setting by pressing NOTE The temperature range varies depending on Installer set-up. • Factory default is 64~86°F (18~30°C). 8.5.4 Selecting Dehumidification Mode Dehumidification removes moisture from a highly-humid environment, especially during the rainy season,...

  • Page 105: Selecting Timed Override

    Operation 3. Set the cooling setpoint by pressing COOL then adjust the temperature displayed under Cool-temperature setpoint in the Temperature section of the display by pressing 4. Set the cooling setpoint by pressing HEAT then adjust the temperature displayed under Heat-temperature setpoint in the Temperature section of the display by pressing 8.5.7 Selecting Timed Override Timed override temporarily overrides the current schedule (occupied/unoccupied).

  • Page 106: Setting The Temperature

    Operation 8.5.9 Setting the Temperature You can adjust the temperature simply by pressing NOTE In Auto mode, both setpoints adjust automatically when you set the temperature in this way. To adjust the cooling or heating setpoint individually, press the appropriate button before adjusting the temperature.

  • Page 107: Selecting Fan Auto

    Operation 8.5.13 Selecting Fan Auto Operates the fan when the outdoor unit is running. 1. Press until is displayed in the sub-function section of the display. 2. Press The setting is saved. 3. Press to exit the sub-function set-up. 8.6 Function Settings 8.6.1 Setting Louver Angle Control Adjusts the angle of airflow.

  • Page 108: Setting The Minimum Difference Between The Cooling And Heating Setpoints

    Operation 8.6.3 Setting the Minimum Difference between the Cooling and Heating Setpoints 1. Press repeatedly until flashes in the Function Settings section of the display. 2. Press to select the temperature, then press The minimum difference is set. 3. Press to exit the function set-up.

  • Page 109: Clearing The "Clean Filter" Alarm

    Operation 8.6.7 Clearing the “Clean Filter” Alarm 1. Press repeatedly until flashes in the Function Settings section of the display. 2. Press The display is cleared. 3. Press to exit the function set-up. 8.7 Schedule Set-up 8.7.1 Simple Schedule A simple schedule automatically runs for a specified time then stops. 1.

  • Page 110: Copy/Paste A Schedule

    Operation 8. Press to select Occupied or Unoccupied, then press to move to the Operation Mode section. The operating-mode icon blinks. 9. Press to select the operating mode, then press COOL 10. Set the cooling setpoint for the schedule, then press HEAT 11.

  • Page 111: Maintenance

    Maintenance 9.0 Maintenance WARNING Arc flash and electric shock hazard. Can cause serious injury or death. Open all local and remote electric power disconnect switches, verify with a voltmeter that power is off and wear personal protective equipment per NFPA 70E before working within the electric control enclosure. If the unit will not be used for an extended period of time, dry the unit to maintain it in the best condition.

  • Page 112: Cleaning The Air Filter

    Maintenance 9.1 Cleaning the Air Filter Clean the air filter once every 2 weeks or more if necessary. NOTE • Bending the air filter can break it. • If the air filter is not assembled correctly, dust and other substances can enter the indoor unit.

  • Page 113: Figure 9-5 Removing The Air Filter From Type 2 Unit

    Maintenance 3. Remove them from the unit, Figure 9-5. Figure 9-5 Removing the air filter from Type 2 unit 4. Clean the filters with a vacuum cleaner or lukewarm water with a neutral detergent. 5. Dry the filters in the shade. 6.

  • Page 114: Cleaning The Optional 3M Or Triple Filter

    Maintenance 9.2 Cleaning the Optional 3M or Triple Filter 1. Turn off power and unplug the power cord. 2. Remove the air filters from the unit. 3. Remove the 3M and/or Triple filters from the unit, Figure 9-8. Figure 9-8 Removing 3M/Triple filters from indoor unit Type1 Type2 4.

  • Page 115: Troubleshooting

    Troubleshooting 10.0 Troubleshooting 10.1 Self-diagnosis at the Indoor Unit The Liebert SRC has a built-in self-diagnosis function. If an error occurs, the lamp of the indoor unit blinks in 2-second intervals. If this occurs, contact your dealer or service center. 10.2 Before Calling for Service Please check the following before contacting service.

  • Page 116: Self-Diagnosis At The Thermostat

    Troubleshooting 10.3 Self-diagnosis at the Thermostat If the unit has a problem, it will self-diagnose with Troubleshooting mode and display “CH” and an error code in the Temperature section of the display, Figure 10-1. NOTE Verify the thermostat function settings after recovery from an error. The settings could have changed because of communication with the controller in group mode.

  • Page 117: Figure 10-2 Error-Code Display For Src18

    Troubleshooting Figure 10-2 Error-code display for SRC18 Decoding Error Display for SRC24 and SRC36 Refer to Figure 10-3. The digital display blinks “CH” then the error number. Figure 10-3 Error-code display for SRC24 and SRC36 ® Liebert SRC™ User Manual...

  • Page 118: Table 10-1 Error Codes

    Troubleshooting Table 10-1 Error Codes SRC18 LED blinks Indoor SRC24 and LED 1 Error Unit SRC36 LED 2 Unit Description displays digit) digit) Indoor unit room-temperature sensor error  — CH01 Indoor unit inlet pipe sensor error  — CH02 Wired remote-control error —...

  • Page 119: Troubleshooting Table

    Troubleshooting 10.5 Troubleshooting Table Table 10-2 lists problems, possible causes, and a corrective action. Table 10-2 Troubleshooting problems, causes and correction Problem Possible Causes Corrective Action • Make sure that there are not curtains, blinds, Air is not circulating properly. or furniture blocking the front of the unit.

  • Page 120: Refrigerant Leaks

    Troubleshooting Table 10-2 Troubleshooting problems, causes and correction (continued) Problem Possible Causes Corrective Action When Heating Mode starts, the vane is almost • This is normal. Please wait until the unit has closed and no air comes out, even thought the generated enough warm air to blow through outdoor unit is operating.

  • Page 121: Figure 10-4 Refrigerant Concentration Limit (Rcl) Calculations Equation

    Troubleshooting 4. If the calculation indicates that the potential refrigerant concentration level is higher than the allowed RCL, increase the cubic volume of the smallest occupied space or modify the piping system design. 5. The allowable RCL limit for most applications must be equal to or less than 0.026 lbs/ft .
  • Page 122 Troubleshooting Page intentionally left blank. ® ™ Liebert User Manual...
  • Page 124 © 2016 Liebert Corporation All rights reserved throughout the world. Specifications subject to changewithout notice. ® Liebert is a registered trademark of Liebert Corporation. All names referred to are trademarks or registered trademarks of their respective owners. SL-11055_REV0_6-16 590-1318-501A Emerson Network Power www.emersonnetworkpower.com...

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