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SterlingTEK A0551797 - page 1
Operation and Installation Manual SSC Series Central Chilling Stations Important! Read Carefully Before Attempting to Install or Operate Equipment Part No. A0551797 Revision: NEW Bulletin No. SC3 - 630 $30. 00 ...
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SterlingTEK A0551797 - page 2
Page 2 of 86 SSC Series Central Chilling Stations Write down your unit serial number(s ) ________________ ________________ here for future reference ________________ ________________ ________________ ________________ ________________ ________________ Sterling is committed to a continuing program of product improvement. Specifications, appearance, a ...
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SterlingTEK A0551797 - page 3
SSC Series Central Chilling Stations Page 3 of 86 Safety Considerations Sterling central chilling stations are designed to provide safe and relia ble operation when installed and operated within design specifications, following national and local safety codes. To avoid possible personnel injury or equipment damage when installing, operating, or mai ...
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SterlingTEK A0551797 - page 4
Page 4 of 86 SSC Series Central Chilling Stations Table of Contents 1 General Information ................................................. 7 1 - 1 Introduction ...................................................................................... 7 1 - 2 Necessary Documents .................................................................... 7 1 - ...
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SterlingTEK A0551797 - page 5
SSC Series Central Chilling Stations Page 5 of 86 Table of Contents 5 Startup Checklists ................................................. 33 5 - 1 Introduction .................................................................................... 33 5 - 2 Water - Coole d SSC Series Startup Checklist ................................. 33 5 - 3 Water - ...
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SterlingTEK A0551797 - page 6
Page 6 of 86 SSC Series Central Chilling Stations Charts and Figures 1 Typical Two - Circuit 60 - 100 Ton Water Cooled Chiller 11 2 Typical Two - Circuit 60 - 100 Ton Remote Air Cooled Chiller 13 3 Freezing Protection Curve 29 4 SSC Series Standard Control Panel 39 5 SSC Series Advanced Control Panel 39 6 SSC Series Standard Control Panel 44 7 SSC ...
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SterlingTEK A0551797 - page 7
SSC Series Central Chilling Stations Page 7 of 86 1 General Information 1 - 1 Introduction Sterling SSC Series central water chilling stations are available in water - cooled and remote air - cooled designs. They differ only in the condensing media used. The SSC Series units are configured with two independent circuits using multiple compressors fo ...
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SterlingTEK A0551797 - page 8
Page 8 of 86 SSC Series Central Chilling Stations 1 - 3 Models Covered This manual provides operation, installation, and maintenance instructions for the SSC Series central chilling stations. Model numbers are listed on the serial tag. A model number followed by Q indicates a specially constructed unit, and n ot all information in this manual may a ...
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SterlingTEK A0551797 - page 9
SSC Series Central Chilling Stations Page 9 of 86 1 - 5 Available Options SSC Series central chillers are available with options to tailor the unit to your requirements. Some are factory installed; some can be re tro - fitted in the field. Consult Sterling sales for more information. Available SSC Series options include: • Advanced control packag ...
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SterlingTEK A0551797 - page 10
Page 10 of 86 SSC Series Central Chilling Stations Model Number Nomecla ture SSC W 060 SSC – Scroll Compressor Central Chiller Condenser Type R – Remote Air Cooled W – Water Cooled Nominal Unit Size – Tons (kW) 030 – 30 (105.4) 070 – 70 (246.0) 040 – 40 (140.6) 080 – 80 (281.2) 050 – 50 (175.7) 090 – 90 (316.3) 060 – 60 (210.9 ...
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SterlingTEK A0551797 - page 11
SSC Series Central Chilling Stations Page 11 of 86 Figure 1 Typical Two - Circuit 60 - 100 Ton Water Cooled Chiller SSCW - xxx Model 30 40 50 60 Cooling Capacity (tons) @ 50°F (10°C) LWT • 32.4 41.4 50.2 64.8 Capacity stages (qty.) 2 4 EER (BTUH/W) 15.65 14.91 15.35 15.66 Evaporator ‚ 78 [295.3] 99 [374.8] 120 [454.2] 156 [590.5] Nominal wate ...
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SterlingTEK A0551797 - page 12
Page 12 of 86 SSC Series Central Chilling Stations SSCW - xxx Model 70 80 90 100 Cooling Capacity (ton s) @ 50°F (10 °C) LWT • 73.1 81.4 90.3 99.2 Capacity stages (qty.) 4 EER (BTUH/W) 15.15 14.63 14.90 15.16 Evaporator ‚ 175 [662.4] 196 [741.9] 217 [821.4] 238 [900.9] Nominal water flow (gpm) [lpm] Condensers ƒ 219 [829.0] 244 [923.6] 271 [ ...
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SterlingTEK A0551797 - page 13
SSC Series Central Chilling Stations Page 13 of 86 Figure 2 Typical Two - Circuit 60 - 100 Ton Remote Air Cooled Chiller SSCR - xxx Model 30 40 50 60 Cooling Capacity (tons) @ 50°F LWT • 29.8 38.4 46.2 59.6 Capacity stages (qty.) 2 4 EER (BTUH/W) 11.36 10.84 11.29 11.11 Nominal water flow (gpm) [lpm] Evaporator ‚ 72 [272.5] 92 [348.3] 111 [420 ...
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SterlingTEK A0551797 - page 14
Page 14 of 86 SSC Series Central Chilling Stations SSCR Series Remote Condenser Models Fan(s) Refrigeration ‚ Each Connections Charge Model Dia. Motor Amps Air flow Discharge Liquid R - 22 Number in. hp • 460V Fans cfm ƒ ODS(in.) ODS(in.) lbs. ƒ SSCR30 26 ¾ hp 3 ø 3.9 3 20,500 1 5 / 8 1 1 / 8 SSCR40 30 1 ½ hp 3 ø 7.0 2 23,200 1 5 / 8 1 5 ...
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SterlingTEK A0551797 - page 15
SSC Series Central Chilling Stations Page 15 of 86 2 Shipping Information 2 - 1 Unpacking and Inspection You should inspect your central chilling station for possible shipping damage. If the container and packing materials are in re - usable condition, save them for reshipment if necessary. Thoroughly check the equipment for any damage that might h ...
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SterlingTEK A0551797 - page 16
Page 16 of 86 SSC S eries Central Chilling Stations 2 - 3 If the Shipment is Not Complete Check the packing list. The apparent shortage may be inten tional. Back - ordered items are noted on the packing list. You should have: þ Sterling SSC Series central chilling station þ Bill of lading þ Packing list þ Operating and Installation packet þ El ...
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SterlingTEK A0551797 - page 17
SSC Series Central Chilling Stations Page 17 of 86 2 - 6 Uncrating Your New Chiller ! W ARNING ! DUE TO THE SIZE AND WEIGHT OF SSC SERIES CHILLERS, STERLING RECOMMENDS USING BONDED PROFESSIONAL MILLWRIGHTS TO UNLOAD AND MOVE SS C SERIES CHILLERS. Rig the chiller from the frame only, using spreader bars to prevent load transfer to any chiller compon ...
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SterlingTEK A0551797 - page 18
Page 18 of 86 SSC S eries Central Chilling Stations - Notes - ...
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SterlingTEK A0551797 - page 19
SSC Series Central Chilling Stations Page 19 of 86 3 Installation 3 - 1 Installation Location Considerations As with all equipment installations, follow all applicable codes and regulations. þ Locate close to the process to reduce piping expense. þ Locate adjacent to drain and city wat er sources. þ Consult a structural engineer to assure that t ...
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SterlingTEK A0551797 - page 20
Page 20 of 86 SSC S eries Central Chilling Stations ! DANGER Improper electrical connections can damage the unit and cau se serious operator injury or death! Bring properly sized power leads and ground from a fused disconnect (installed by your electrician) to the unit. Provide external overcurrent protection to the unit, using circuit breakers or ...
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SterlingTEK A0551797 - page 21
SSC Series Central Chilling Stations Page 21 of 86 Note: • Never switch contactor leads or motor leads for reversing rotation. • Do not use contactor or motor leads for phase matching. • Compressor noise from reverse rotation is noticeable. Do not run in this mode for more than ten (10) seconds. The compressor shuts off if it is run longer in ...
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SterlingTEK A0551797 - page 22
Page 22 of 86 SSC S eries Central Chilling Stations To Process The chilled water supply outlet leading to the process being controlled. From Process The ch illed water return for water returning back to the chiller from the process to be cooled and recirculated. 3 - 5 Making Tank Piping Connections If you have purcha sed the SSC Series central chil ...
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SterlingTEK A0551797 - page 23
SSC Series Central Chilling Stations Page 23 of 86 3 - 6 Water Connection Sizing Considerations Important! • Run all externa l chilled water connections with adequate size to the process. • Provide the largest possible openings and passages for the flow of chilled water through platens, dies, molds, or other pieces of equipment. • Minimum ext ...
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SterlingTEK A0551797 - page 24
Page 24 of 86 SSC S eries Central Chilling Stations Two connections are made to each SSC Series unit: Condenser Water In The city or tower water supply inlet is located at the side or rear of the chiller. • Water pressure ≥ 25 psi ( ≥ 172.4 kPa/ ≥ 1.72 bars) • Water temperature ≤ 85°F ( ≤ 29ºC) Condenser Water Out The return outlet, ...
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SterlingTEK A0551797 - page 25
SSC Series Central Chilling Stations Page 25 of 86 SSC Series condensing pressure with 95ºF (35ºC) condenser air R - 22 = 260 psi (1,793 kPa/17.93 bars) Note: Due to the variables involved in remote air - cooled condenser installations, no set or standard piping procedure exists. Each installation must be designed and installed by qualif ied pers ...
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SterlingTEK A0551797 - page 26
Page 26 of 86 SSC S eries Central Chilling Stations - Notes - ...
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SterlingTEK A0551797 - page 27
SSC Series Central Chilling Stations Page 27 of 86 4 Sequence Of Operation 4 - 1 Staging 1. The system uses a PID control algorithm to regulate the chilled water temperature. As the required control effort increases or decreases, the system compressors are turned on or off to keep the temperature at the specified set - point 2. Compressor anti - re ...
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SterlingTEK A0551797 - page 28
Page 28 of 86 SSC S eries Central Chilling Stations 4 - 5 Chilled Water Circuit If your central chilling station is equipped with the optional integral pump tank, make the process cooling water supply connection at the P1 manifold at the left side of the pump tank at the exposed connection. Bring the process cooli ng water return connection to the ...
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SterlingTEK A0551797 - page 29
SSC Series Central Chilling Stations Page 29 of 86 If you want lower chilled water temperatures, you’ll need to mix process water with industrial - (not automotive) grade ethylen e or propylene glycol with rust inhibitor to provide protection down to 20°F (12ºC) below the operating temperature you want. Figure 3 below shows the proper mixtures ...
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SterlingTEK A0551797 - page 30
Page 30 of 86 SSC S eries Central Chilling Stations 4 - 8 High Pressure Cutout This electro - mechanical safety feature opens the control cir cuit if the system condensing pressure exceeds a safe level. High pressure cutout setting Model psi kPa bars SSC Series water - cooled chilling stations 290 psi 2,000 kPa 20 bars SSC Series remote air - coole ...
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SterlingTEK A0551797 - page 31
SSC Series Central Chilling Stations Page 31 of 86 4 - 11 Control Nipple All SSC Series chilling station evaporators have two control nipples. The flow switch, freezestat, and flush port are locat ed in the control nipple. Optional pressure gages can be mounted in the control nipples to aid in achieving proper flow through the evaporator and balanc ...
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SterlingTEK A0551797 - page 32
Page 32 of 86 SSC S eries Central Chilling Stations - Notes - ...
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SterlingTEK A0551797 - page 33
SSC Series Central Chilling Stations Page 33 of 86 5 Startup Checklists 5 - 1 Introduction Important! These lists assume the installation information in this manual has been read and followed. Have new chillers started up and checked by a qualified refrigeration service technician. Sterling offers factory startup for SSC Series Series ch illing sta ...
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SterlingTEK A0551797 - page 34
Page 34 of 86 SSC S eries Central Chilling Stations þ Complete all piping leading to and from the pump tank. Observe all applicable codes. þ Complete all electrical wiring. Observe all applicable codes. þ Prepare all related equipment in the system for operation. Note: • Ne ver switch contactor leads or motor leads for reversing rotation. • ...
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SterlingTEK A0551797 - page 35
SSC Series Central Chilling Stations Page 35 of 86 þ Check the water level in the pump tank to be sure the pump does not run dry while the system piping is being filled. þ Check your work and proceed to the Startup procedure. 5 - 3 Water - Cooled SSC Series Startup 1. Start the chiller by pushing the Start button on the control panel of the unit. ...
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SterlingTEK A0551797 - page 36
Page 36 of 86 SSC S eries Central Chilling Stations þ Electrical connections must conform to all applicable code s. þ Complete the chilled water TO and FROM PROCESS connections. þ The optional or field installed chilled water supply and return valves must be open. þ Be sure the tank and chilled water circuit piping are filled with a water/glyco ...
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SterlingTEK A0551797 - page 37
SSC Series Central Chilling Stations Page 37 of 86 þ Check for proper pump rotation direction. To confirm proper rotation : 1. Observe a pump pressure gauge connected to the suction and discharge sides of the pump casing through two ¼” (approx. 6.4 mm) gauge cocks. 2. Close the gauge cock leading to the pump suction and open the gauge cock lead ...
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SterlingTEK A0551797 - page 38
Page 38 of 86 SSC S eries Central Chilling Stations Note: If the recirculation pump does not turn on (or that the flow switch is not satisfied) the compressors will not be allowed to turn on. 6. Check the pump(s) amp draws and pressures. The amp draws must be within the pump(s) running load and service factor amps. 7. Operate the chiller, looking f ...
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SterlingTEK A0551797 - page 39
SSC Series Central Chilling Stations Page 39 of 86 Figure 4 SSC Series Standard Control Panel Figure 5 SSC Series Advanced Control Panel ...
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SterlingTEK A0551797 - page 40
Page 40 of 86 SSC S eries Central Chilling Stations - Notes - ...
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SterlingTEK A0551797 - page 41
SSC Series Central Chilling Stations Page 41 of 86 6 Graphic Panel Devices 6 - 1 Indicator Lights and Control Switches (MMI) System On The green System On indicator lights when the main power switch is on and the control circuit is energized. Start The Start push - button lets you energize the unit. Stop The Stop push - button lets you de - energiz ...
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SterlingTEK A0551797 - page 42
Page 42 of 86 SSC S eries Central Chilling Stations - Notes - ...
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SterlingTEK A0551797 - page 43
SSC Series Central Chilling Stations Page 43 of 86 Using the Standard 7 Touchscreen Interface 7 - 1 Touchscreen Interface Introduction (MMI) The Standard touchscreen interfaces let you control your SSC Series central chilling station. You can do such things as: • Control compressors and optional pumps • View current statuses of operation, such ...
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SterlingTEK A0551797 - page 44
Page 44 of 86 SSC S eries Central Chilling Stations Figure 6 SSC Series Standard Control Panel 7 - 2 Using the SSC Series Standard Touchscreen Interface The SSC Series Standard touchscreen interface is the “manager” of your SSC Series cent ral chilling station. The screen contains screen buttons you can press to control system operation. For ex ...
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SterlingTEK A0551797 - page 45
SSC Series Central Chilling Stations Page 45 of 86 7 - 3 Getting Started on the SSC Series Standard Touchscreen Interface To start the SSC Series Standard touchscreen interface: n Push the ON/OFF button on the cabinet. The SSC Series control pa nel energizes and the System On indicator turns on. The Main Menu screen displays: Main Menu Screen The M ...
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SterlingTEK A0551797 - page 46
Page 46 of 86 SSC S eries Central Chilling Stations • “ CONFIGURATION MENU ” contains the chiller setup parameters (i.e. chiller setpoint, and high and low temperature alarm setpoints) The following sections in this chapter list the information you need to navigate t hrough these screens for operating and monitoring your SSC Series central ch ...
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SterlingTEK A0551797 - page 47
SSC Series Central Chilling Stations Page 47 of 86 2. READY – Indicates that the compressor is enabl ed and ready to run. However, the current loading does not require the compressor to be running. This compressor will be automatically started when needed. 3. RUNNING – Compressor is currently running. 4. FAULT – A safety on the compressor ind ...
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SterlingTEK A0551797 - page 48
Page 48 of 86 SSC S eries Central Chilling Stations The compressor enable screen displays: Compressor Enable Screen These screens allow the customer to toggle the compressors between ON - LINE and OFF - LINE. As the operator presses the F1 or F2 butto n, the corresponding compressor state changes between ON - LINE and OFF - LINE. Setting Compressor ...
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SterlingTEK A0551797 - page 49
SSC Series Central Chilling Stations Page 49 of 86 Viewing Compressor Run Times From the Main Menu, use the or buttons to highlight the “ HOURMETERS ” menu. Scroll to select the compressors. T hen press ↵ to display the hourmeter. Note: this is a complete list of all components that may be included in the system. Any component that is not inc ...
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SterlingTEK A0551797 - page 50
Page 50 of 86 SSC S eries Central Chilling Stations 7 - 5 Vie wing and Operating Chiller Pumps If your chiller system was configured to operate the pump(s) of the chilled water pump tank the user may view the status of the process and recirculation pumps. Viewing Chiller Pump Status To view the status of the pumps, start from the Main Menu, then: n ...
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SterlingTEK A0551797 - page 51
SSC Series Central Chilling Stations Page 51 of 86 Operating Chiller Pumps To turn on and off the pumps, start from the Main Menu, then: n Press the or buttons to highlight either “ CONFIGURATION MENU ”. n Press ↵ n Highlight “ PUMP ENABLES ” n Press ↵ n Highlight the pump you want to oper ate. The Pump Enables Screen appears Pump Enabl ...
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SterlingTEK A0551797 - page 52
Page 52 of 86 SSC S eries Central Chilling Stations The compressor lead/lag screen displays: Pump Lead/Lag Screen Viewing Pump Run Times From the Main Menu, use the or buttons to highlight the “ HOURMETERS ” menu. Scroll to select the pump. Then press ↵ to display the hourmeter. Note: this is a complete list of all pumps that may be incl uded ...
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SterlingTEK A0551797 - page 53
SSC Series Central Chilling Stations Page 53 of 86 Two hourmeters are kept for each compressor in the system. The first is a lifetime meter. Thi s measures the total time that the pump has been operational in the lifetime of the chiller. The second is a resettable hourmeter. This hourmeter can be cleared to monitor run time on specific intervals. I ...
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SterlingTEK A0551797 - page 54
Page 54 of 86 SSC S eries Central Chilling Stations To acknowledge the alarm, press F1 to clear the alarm. It will then appear in the alarm history screen. Except for High and Low Wa ter Temperature, and Low Refrigerant Pressure, these alarms are considered fatal and maintenance must be preformed in order to allow the chiller to fully run. Should a ...
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SterlingTEK A0551797 - page 55
SSC Series Central Chilling Stations Page 55 of 86 7 - 7 Vie wing and Setting System Temperatures To view the actual process temperature select any of the status screens from the main menu. The proces s temperature is located on the bottom of the screen. For example, the compressor status displays: Compressor Status Screen Note: If you have a metri ...
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SterlingTEK A0551797 - page 56
Page 56 of 86 SSC S eries Central Chilling Stations Once the value is co rrect, press the ↵ button to make the change. In the event that the value is outside the range specified by MAX or MIN, the value entered will be the corresponding MAX or MIN. ...
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SterlingTEK A0551797 - page 57
SSC Series Central Chilling Stations Page 57 of 86 Using the Adv anced 8 Touchscreen Interface 8 - 1 Touchscreen Interface Introduction (MMI) The Advanced touchscreen interfaces let you control your SSC Series central chilling station. You can do such things as: • Control compressors and optional pumps • View current statuses of operation, such ...
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SterlingTEK A0551797 - page 58
Page 58 of 86 SSC S eries Central Chilling Stations Figure 7 SSC Series Advanced Control Panel 8 - 2 Using the SSC Series Advanced Touchscreen Interface The SSC Series Advanced touchscreen interface is the “manager” of your SSC Series central chilling station. This screen contains screen buttons you can press to control system operation. For ex ...
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SterlingTEK A0551797 - page 59
SSC Series Central Chilling Stations Page 59 of 86 8 - 3 Getting Started on the SSC Series Advanced Touchscreen Interface To start the SSC Series St andard touchscreen interface: n Push the ON/OFF button on the cabinet. The SSC Series control panel energizes and the System On indicator turns on. The Main Menu screen displays: Figure 8 Main Menu Scr ...
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SterlingTEK A0551797 - page 60
Page 60 of 86 SSC S eries Central Chilling Stations • “ Compressor Hourmeters ” contains the lifetime and resettable hour meters to show the number of hours that the compres sors have been running • If the chiller was configured to operate the chilled water pump tank, there are three screens to configure and view the pump tank setup. The co ...
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SterlingTEK A0551797 - page 61
SSC Series Central Chilling Stations Page 61 of 86 Figure 9 Chiller Status Screen The Chiller Status screen shows the status for compressors within the system. Only compressors tha t are included in the system will be shown on this screen. Compressors will display one of the following states: 1. OFFLINE – This indicates that the compressor has be ...
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SterlingTEK A0551797 - page 62
Page 62 of 86 SSC S eries Central Chilling Stations state unless it is put in the OFFLINE state. The color code for this indication is red. Operating the chiller compressors To enable or disable the individual compress ors, start at the Main Menu, then: n Press the Up or Down buttons on the right side of the screen to highlight “ Chiller Configur ...
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SterlingTEK A0551797 - page 63
SSC Series Central Chilling Stations Page 63 of 86 Setting Compressor Lead/Lag Times and Activating Compressor Lead/Lag Operation While in the Configur ation Menu, the compressors can be setup in a lead/lag configuration using interval hours. By pressing the “ Compressor Rotation Interval ” button, a numeric keypad will be displayed and allow t ...
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SterlingTEK A0551797 - page 64
Page 64 of 86 SSC S eries Central Chilling Stations Figure 11 Compressor Run Time Display Screen Two hourmeters are kept for each compressor in the system. The first is a lifetime meter. This measures the total time that th e compressor has been operational in the lifetime of the chiller. The second is a resettable hourmeter. This hourmeter can be ...
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SterlingTEK A0551797 - page 65
SSC Series Central Chilling Stations Page 65 of 86 Viewing Chiller Pump Status To view the status of the pumps, start from the Main Menu, then: n Press the Up or Down buttons to highlight either “ System Information ”. n Press ↵ The Pump Status Screen appears Figure 12 Pump Status Screen Only pumps that are included in the system will be show ...
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SterlingTEK A0551797 - page 66
Page 66 of 86 SSC S eries Central Chilling Stations 2. READY – Indicates that the pump is enabled and ready to run. However, the current number of pumps specified to run does not require this pump to operate. The color code for this indication is yellow. 3. RUNNING – Pump is currently running. The color code for this indication is green. 4. FAU ...
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SterlingTEK A0551797 - page 67
SSC Series Central Chilling Stations Page 67 of 86 Any pump that is disabled to the OFF - LINE position will not be called to operate. Simply press th e button of the desired pump to toggle the state of the pump from the ON - LINE to OFF - LINE state. Setting Pump Lead/Lag Times and Activating Pump Lead/Lag Operation While in the Configuration Menu ...
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SterlingTEK A0551797 - page 68
Page 68 of 86 SSC S eries Central Chilling Stations Figure 14 Pump Run Time Display Scree n Two hourmeters are kept for each compressor in the system. The first is a lifetime meter. This measures the total time that the pump has been operational in the lifetime of the chiller. The second is a resettable hourmeter. This hourmeter can be cleared to m ...
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SterlingTEK A0551797 - page 69
SSC Series Central Chilling Stations Page 69 of 86 n Compressor Motor Protector Fault (One for each compressor) n Chilled Water Circuit Low Flow (One per chilled water circuit) n Chilled Water Circuit Freezestat (One per chilled water circuit) n Chilled Water Circuit High Pressure (One per chilled water circuit) n Chilled Water Circuit Low Pressure ...
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SterlingTEK A0551797 - page 70
Page 70 of 86 SSC S eries Central Chilling Stations pump turn off from an alarm condition the remaining will shut down and display FAULT in the status screen for the device. Once a device has gone offline you will need to con tact a licensed professional (electrician or refrigeration sevice company) to bring the device back online. ! CAUTION Never ...
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SterlingTEK A0551797 - page 71
SSC Series Central Chilling Stations Page 71 of 86 8 - 7 Vie wing and Setting System Temperatures To view the actual process temperature start at the Main Menu and n Use the Up or D own arrows to highlight “ System Information ” n Press ↵ The system status displays: Figure 16 System Status Screen Note: If you have a metric version of the SSC ...
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SterlingTEK A0551797 - page 72
Page 72 of 86 SSC S eries Central Chilling Stations Setting S ystem Temperatures The chiller setpoints are set through the compressor configuration menu. Starting from the Main Menu: n Press the Up or Down buttons to highlight “ Chiller Configuration ” n Press ↵ n Touch the “Process Set - point” button The input display screen app ears: F ...
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SterlingTEK A0551797 - page 73
SSC Series Central Chilling Stations Page 73 of 86 9 Routine Maintenance 9 - 1 Lubrication Grease all fan bearings, fan motors, and pump motors tha t do not have permanently sealed bearings. Remove the grease relief plug (motors only) before adding grease. Failure to do so may dislodge the bearing grease retainer which will eventually cause bearing ...
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SterlingTEK A0551797 - page 74
Page 74 of 86 SSC S eries Central Chilling Stations 9 - 3 Evaporator Maintenance The evaporator(s) may be accessed for back - flushing by removal of the 2” plug (approx. 51 mm) in the return control nipple and the flow switch in the supply control nipple. If the suggested piping recommendations have been followed, one circuit of a multiple circui ...
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SterlingTEK A0551797 - page 75
SSC Series Central Chilling Stations Page 75 of 86 9 - 7 Preventive Maintenance Service A systematic preventive maintenance program helps avoid costly down time. Call the Service Department at Sterling to arrange a schedule of inspections. This service, described in Sterling Bulletin No. 10 - 106.3 , is tailored to fit your maintenance requirements ...
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SterlingTEK A0551797 - page 76
Page 76 of 86 SSC S eries Central Chilling Stations - Notes - ...
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SterlingTEK A0551797 - page 77
SSC Series Central Chilling Stations Page 77 of 86 10 Troubleshooting Problem Possible Cause Solution No power. Check main disconnect, fuses, wiring, and power lead to unit. Wrong volt age supplied to unit. Voltage must be within plus or minus ten percent (±10%) of nameplate rating. Defective On/Off switch. Replace switch. Control circuit fuse blo ...
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SterlingTEK A0551797 - page 78
Page 78 of 86 SSC S eries Central Chilling Stations Problem Possible Cause Solution Allow time to cool and reset. Check for high/low voltage. Voltage must be within plus or minus ten percent (±10%) of nameplate rating. Check for poor compressor electrical connections. Compressor internal overload open. Check compressor rotation on scroll compresso ...
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SterlingTEK A0551797 - page 79
SSC Series Central Chilling Stations Page 79 of 86 Problem Possible Cause Solution Pump is running in reverse. Verify proper rotation; if incorrect, see Changing Rotation Direction on Page 25 for more informatio n. Pump pressure is too low. Check for foreign matter. Clean the system. You may also have to pull the pump and inspect the impeller. Chec ...
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SterlingTEK A0551797 - page 80
Page 80 of 86 SSC S eries Central Chilling Stations Service Notes ...
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SterlingTEK A0551797 - page 81
SSC Series Central Chilling Stations Page 81 of 86 I Index Alarms Advanced Controls, 68 Standard Controls, 53 Available options, 9 Checking Motor Direction, 25 Chiller Pumps Advanced Controls, 64 Chiller Shutdown, 38 Circuit Alarm Sequence, 27 Compressor Lead - Lag, 27 Compressor Staging Sequence, 27, 31 Condenser Maintenance, 73 Copyright informat ...
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SterlingTEK A0551797 - page 82
Page 82 of 86 SSC S eries Central Chilling Stations Water Cooled Startup Checklist, 33 Water Treatment Considerations, 23 Wa ter - Cooled Condenser Connections, 23 ...
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SterlingTEK A0551797 - page 83
SSC Series Central Chilling Stations Page 83 of 86 Service Notes ...
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SterlingTEK A0551797 - page 84
Page 84 of 86 SSC S eries Central Chilling Stations Service Notes ...
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SterlingTEK A0551797 - page 85
SSC Series Central Chilling Stations Page 85 of 86 Service Notes ...
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SterlingTEK A0551797 - page 86
Page 86 of 86 SSC S eries Central Chilling Stations Parts Department Call toll - free 7am – 6pm CST [ 800 ] 423 - 3183 or call [ 262 ] 641 - 8653 The Parts Department at Sterling is ready to provide the parts to keep your systems up and running. Sterling replacement parts ensure operation at design specifications. Please hav e the model and seria ...
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