Stulz SCS Series Installation, Operation And Maintenance Manual Download | Manualshive

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-SCS C

ONDENSER

IOM

M

ANUAL

26

Symptom

Probable Cause

Recommendation

Head Pressure Too
High

Low condenser airﬂow. (Indicated
by excessive warm air leaving the
condenser fan).

Open air passages.

Clean coil.

Check condenser fan(s).

Air or other non-condensable gas
in system

Reclaim system and recharge. Install a new drier strainer.

Overcharge of refrigerant

Reclaim excess refrigerant from system

Condenser fan not on.

Check main voltage power source to unit.

Check fan, contactor, fan cycling switch or fan speed
controller

Erratic Fan Operation

Dirty or blocked condenser coil.

Clean coil or remove blockage

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Summary of Contents for SCS Series

Page 1: ... SCS Series Installation Operation and Maintenance Manual Remote Air Cooled Condensers For Indoor Cooling Systems ...

Page 2: ...al 252 276 312 447 525 597 683 940 1366 D Dual SCS Series Micro Channel Condensers Nomenclature SCS MC XXX XXX XX Condenser Section with Micro Channel Coil 015 018 S Single AA Fan Cycle Control SA Variable Speed Control EC Variable Speed Control Electronically Commutated Fans LN Low Noise Variable Speed Control Electronically Commutated Fans O Standard F Flooded Head Pressure Control with Receiver...

Page 3: ...ULZ This document contains confidential and proprietary information of STULZ Air Technology Systems Inc Distributing or photocopying this document for external distribution is in direct violation of U S copyright laws and is strictly prohibited without the express written consent of STULZ Unpublished rights reserved under the copyright laws of the United States and of other countries Other brands ...

Page 4: ...uid Line 12 2 5 2 Head Pressure Control Valve Installation SCS condenser only 12 2 5 3 Receiver Pipe Installation SCScondenser only 13 2 6 Utility Connections 13 2 6 1 Main Power andControl Wiring 13 2 6 1 1 Condenser Enable Feature 14 2 7 2 Estimating Refrigerant Charge 15 2 7 3 Preparing SystemFor Charging 17 2 7 4 Refrigerant Charging Procedures 18 2 7 4 1 0 ºF Fan Cycling and 20 ºF Variable Sp...

Page 5: ...lb 16 Table 7 Weight of Refrigerant lb 100 ft of Type L Tubing 16 Table 8 Refrigerant Pressure Temperature Settings 20 Figures Figure 1 Typical Layout SCS Condenser 4 Figure 2 Typical Layout SCS MC Condenser 4 Figure 3 Flooded Head PressureControl Diagram 7 Figure 4 Ground Mounting 9 Figure 5 Side Clearance 9 Figure 6 Walled Areas or Pits 10 Figure 7 Receiver Assembly 10 Figure 8 Piping Installati...

Page 6: ...densers are also available SCS MC condensers are equipped with micro channel coils which offer greater refrigerant to air heat transfer The total heat rejection in BTU hr will depend on the unit size Refer to the unit nameplate to identify the model number of your unit The system will consist of a single refrigeration circuit or dual circuit coil The coil is a closed loop refrigerant condensing he...

Page 7: ...bservethiswarning may result in injury to personnel and damage to the equipment Do not allow anyone under the equipment suspended from a lifting sling Never work on electrical equipment unless another person who is familiar with the operation and hazards of the equipment and competent in administering ﬁrst aid is nearby When working on electrical equipment remove all jewelry watches rings etc Keep...

Page 8: ... s MSDS provided with the unit Avoid skin contact or inhaling fumes from anyacid formed by burn out of oil and refrigerant Wear gas mask if area is not thoroughly ventilated Wear protectivegoggles orglassesto protecteyes Wear rubber gloves to protect hands Use care to avoid spilling compressor burnout sludge If sludge is spilled clean area thoroughly When performing soldering or de soldering opera...

Page 9: ... SCS CONDENSER IOM MANUAL 4 Figure 1 Typical Layout SCS Condenser Figure 2 Typical Layout SCS MC Condenser ...

Page 10: ...ng control settings on a case by case basis This is due in part to site speciﬁc heat loads and varying BTU capacities of indoor evaporator A C units Contact STULZ Product Support for assistance On single circuit condensers each fan is controlled with its own fan cycling switch Multiple fans are staged to operate sequentially as discharge pressure rises The primary fan closest to the header turns o...

Page 11: ...ins to operate the discharge pressure rises When the pressure reaches the 1st Fan pressure control setting Table1 the condenser fan is cycled on as described in 1 5 1 If multiple fans are used they will operate by pressure fan cycling When ambient temperature drops the discharge pressure drops also When the discharge pressure drops the head pressure control valve diverts discharge gas away from th...

Page 12: ...SCS CONDENSER IOM MANUAL 7 Figure 3 Flooded Head Pressure Control Diagram ...

Page 13: ...utine operation servicing and for necessary maintenance The components on outdoor condensersareaccessedthroughthetopby removingthefan assembly panel The electric box is accessed at the header end ofthe unit Locatethe unitwherethefan s are not likelyto draw dirt and debris into the coil ﬁns Refer to the installation drawing provided with your unit forthe dimensions NOTE Working clearance requiremen...

Page 14: ...recommended that vibration isolators ﬁeld supplied by others be inserted between the mounting rails and the base as shown in Figure 4 Figure 4 Ground Mounting The clearance around the unit to the nearest wall or obstruction should be at least 1time s 1 the unit swidth to ensure adequate airﬂow to the coil s see Figure 5 and Figure 6 Space multiple units at least 2 times 2 the unit s width when pla...

Page 15: ...erantpipingshouldbeinstalledwithhightemperature soldered joints Use standard refrigeration practices for piping supports leak testing dehydration and charging of the refrigeration circuits NOTE Refer to the Copeland Applications Data Guide for more detailed information regarding installation of refrigerant piping The condenser is shipped with a dry nitrogen holding charge which must be removed bef...

Page 16: ...g conditions It s important that the discharge line is sized with a certain degree of pressure drop This will ensuretherefrigerantﬂowsat a velocity high enough for the refrigerant vapor to carry the oil with it to the condenser and to prevent the oil from returning to the compressor Compressor discharge pressure is always higher than condensing pressure due to the line pressure drop The line press...

Page 17: ...ss than 300 fpm to avoid liquid hammering during solenoid operation If the condenser is installed below the evaporator section the installer must observe the pressure changes that occur iftheelevationchange SeeTable4 that follows forthe vertical pressure drops for the two typesofrefrigerantused Table 4 Pressure Drops Refrigerant Type Pressure Drop in PSI ft Risers R407C 0 47 R410A 0 43 NOTE When a...

Page 18: ...e main power supply coincides with the voltage phase and frequency information speciﬁed on the system nameplate see Figure 11 The supply voltage measuredat the unit must bewithin 10 ofthevoltage speciﬁed onthe nameplate The nameplate also provides the full load amps FLA the current that the unit will draw under full design load the minimum circuit ampacity MCA for wire sizing and the maximum fuse ...

Page 19: ... for SCS condensers itwillbenecessaryto providea2 conductor cable for the heating pad s Connect the wires from the terminals inside the junction box on the receiver base see Figure 7 to the terminal block in the condenser electric box Drill an entrance hole inthe condenser electric box or use an available knock out if furnished See the wiring diagram for the correct wire terminalpositions 2 7 Syst...

Page 20: ...ch circuit The values shown in Table 5 and Table 6 are conservative for the purpose of preventing the system from being overcharged Table 5 SCS Condenser Refrigerant Charge Weights lb SCS Model Number R407C Charge Condenser Less Receiver R407C Charge Condenser with Receiver R410A Charge Condenser Less Receiver R410A Charge Condenser with Receiver 20 F Ambient Higher 30 F Ambient 20 F Ambient Highe...

Page 21: ... 2 6 12 8 056 S 2 0 11 8 2 1 11 0 056 D 2 6 13 8 2 6 12 8 071 S 3 8 19 1 3 9 17 8 071 D 4 8 24 4 4 8 22 6 111 S 3 8 19 1 3 9 17 8 111 D 4 8 24 4 4 8 22 6 128 D 5 8 36 4 6 0 33 8 142 D 7 6 38 2 7 8 35 6 223 D 7 6 38 2 7 8 35 6 264 D 10 4 41 0 10 8 38 6 334 D 10 4 41 0 10 8 38 6 Dual refrigeration circuits Table 7 Weight of Refrigerant lb 100 ft of Type LTubing Line Size O D Liquid Line 105 F Discha...

Page 22: ...se copper tubing instead of hoses if possible due to the low vacuum that must be attained when evacuating the system The use of short large diameter hoses helps reduce evacuationtime 3 After ensuring there are no leaks relieve pressure and evacuate the entire system while maintaining all the solenoids and hot gas reheat valves open Pull aninitial vacuum of 1500 microns or lower using the suction a...

Page 23: ...rotection WARNING If refrigerant gas is released in an enclosed area it may accumulate in low areas and near the ﬂoor displacing available oxygen If a major leak occurs there is a risk of asphyxiation Insuchcasethearea should be immediately evacuated and ventilated Personnel should remain away from the area until it is determined to besafe INITIAL SYSTEM CHARGE Followthestepbystepinstructionsbelow...

Page 24: ...al condenser and receiver volume to allow room for expansion The most accurate way to determine the total system refrigerantchargeisbycalculatingitasdiscussedinSection 2 7 2 Thisprocedurewillassistincharginga ﬂoodedsystem to achieve proper operation during low ambient conditions Perform the initial system charge as described in Section 2 7 4 steps1 3 Energizeallsolenoids hotgasbypass hot gas rehea...

Page 25: ...5 cutout EC Fan Fan 1 on SCS Condenser 240 psig start 65 psig differential R410A Refrigerant Fan 1 440 psig cut in 330 psig cut out Fan 2 460 cut in 355 cutout Fan 3 475 cut in 365 cut out Fan 4 485 cut in 375 cutout EC Fan Fan 1 on SCS Condenser 340 psig start 100 psig differential Fill out the applicable sections of the Warranty Registration and Start Up Checklist 2 8 Refrigerant Characteristics...

Page 26: ...80 236 85 255 90 274 95 295 100 318 105 341 110 365 115 391 120 418 125 446 130 477 135 508 140 541 R410A Refrigerant Tempera ture ºF Pressure psid Saturated Evaporating Temperature Dew Point Saturated Vapor 20 37 9 22 40 1 24 42 3 26 44 7 28 47 1 30 49 6 32 52 1 34 54 8 36 57 5 38 60 3 40 63 2 42 66 1 44 69 2 46 72 3 48 75 5 Bubble Point Saturated Vapor 50 78 8 95 209 100 78 8 Saturated Condensin...

Page 27: ...uid refrigerant ﬂows to a receiver The receiver acts as a storage tank for the liquid refrigerant that is not in circulation 3 The refrigerant ﬂows through a liquid sight glass This device shows the presence of air moisture and the condition of the refrigerant in thesystem 4 The low temperature high pressure liquid refrigerant then ﬂows to the evaporator where it removes heat and evaporates back i...

Page 28: ...a package with your unit Test cooling operation by adjusting the temperature setpoint at the system controller The compressor should come on and the suction line temperature should gradually drop Ensure the fan s are rotating correctly and freely without any unusual noise Operational Description When used with a STULZ indoor evaporator unit the A C system compressor starts then the condenser fan s...

Page 29: ...round the air inlet and outlet grills fans motors and coils Use a vacuum cleaner with a soft bristle brush to clean dirt from components Clean the coil of all debris that will inhibit airﬂow This can be done with a vacuum cleaner soft brush and compressed air or a mild neutral PH detergent may be used if needed Chemical coil cleaners not speciﬁcally formulated for micro channel coils are not recom...

Page 30: ...y using a pair of channel lock pliers to turn the shaft of the main power disconnect switch to the On position When the switch is turned on high voltage will be present inside the box Exercise caution to prevent injury Keep hands clothingandtoolsclearoftheelectricalterminalsandrotating components Verify that yourfooting is stable WARNING This equipment should be serviced and repaired by a journeym...

Page 31: ...il Check condenser fan s Air or other non condensable gas in system Reclaim system and recharge Install a new drier strainer Overcharge of refrigerant Reclaim excess refrigerant from system Condenser fan not on Check main voltage power source to unit Check fan contactor fan cycling switch or fan speed controller Erratic Fan Operation Dirty or blocked condenser coil Clean coil or remove blockage ...

Page 32: ...s responsible for the shipping charges If you do not have established credit with STULZ you must give a freight carrier account number A written or faxed purchase order is required on warranty parts and must be received prior to 2 00 p m for same day shipment The purchase order must contain the following items Purchase Order Number Date of Order STULZ Stated PartPrice BillingAddress Shipping Addre...

Page 33: ...alled open valve 9 Humidifier On Off Drain switch is in the on position 10 Filter s installed 11 Duct plenums sealed 12 Incoming line voltage matches equipment nominal nameplated rating tolerances 13 Main power wiring connections to the equipment including earth ground have been properly installed 14 Customer supplied main power circuit breaker HACR type or fuses have proper ratings for equipment ...

Page 34: ... freely Additional Check chilled water hot water circuits for air bleed as required Coils clean and clear of obstructions Humidifier cylinder and controls operate properly Y N Y N Tighten electrical connections Clean coils Check contacts on contactors for pitting Clean condensate pump Heat reheat operational Inspect and clean CW screen Clean unit Y N Inspect chilled water unit for leaks and corros...

Page 35: ... National Fire Protection Agency ESD Electrostatic Discharge PH Phase ºF Degrees Fahrenheit PSI Pounds Per Square Inch FLA Full Load Amps PSIG Pounds Per Square Inch Gauge FOB Freight on Board RLA Run Load Amps HACR Heating Air Conditioning Refrigeration R Value Thermal Resistance HP Horse Power SDS Safety Data Sheet Hz Hertz SPDT Single Pole Double Throw IAQ Indoor Air Quality STULZ STULZ Air Tec...

Page 36: ...quarters STULZ Air Technology Systems Inc 1572 Tilco Drive Frederick MD 21704 301 620 2033 Fax 301 662 5487 info stulz ats com Technical Support 888 529 1266 www stulz usa com ORS0014F Nov 2018 STULZ Air Technology Systems Inc Specifications subject to change without notice ...

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