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Stulz SCS Series, Инструкция по установке, эксплуатации и обслуживанию

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-SCS C

ONDENSER 

IOM

 

M

ANUAL

 

20 

               

               

  

 

 

R410A) or your summer maximum operating head pressure. 
Hold the pressure steady at this setting. You should observe 
that cycling “Off” on head pressure will not occur now or 

during warmer temperatures.

 

If a refrigerant level sight glass is included on the side of the 
receiver (optional), it may be used to assist in charging the air 
conditioning system. The proper charge can be confirmed by 
viewing the level of refrigerant in the receiver while the unit 
is running at an elevated discharge pressure (320 psig for 
R407C; 440 psig for R410A).  
Add refrigerant charge until the  refrigerant  appears  in  the 
sight glass indicating the receiver is 80% filled. When the 
level of refrigerant in the receiver reaches the sight glass, 
the unit is fully charged.

 

CAUTION

 

 

Remove the blockage to the air intake of the condenser.

 

2.7.4.2.2

 

Final Adjustment

 

Now you may adjust the condenser fan settings to assist 
with low ambient control. The following settings have proven 
effective:

 

R407C Refrigerant

 

Fan 1 - 320 psig cut-in; 240 psig cut-out 
Fan 2 - 330 cut-in; 250 cutout

 

Fan 3 - 340 cut-in; 260 cutout Fan 
Fan 4 - 345 cut-in; 265 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

 

2.8.1

 

Pressure/Temperature Settings

 

Table 8 is provided to assist with the normal settings of the 
system for R407C and R410A refrigerant. Where applicable, 

minimum and maximum settings are given along with normal 
operating pressures.

 

NOTE: The operating pressures for R410A refrigerator 

significantly higher than R407C. 

 

Table 8.  Refrigerant 

Pressure/Temperature Settings 

Refrigerant Pressure/Temperature Settings 

 
 
Sub-cooling °F

 

Normal

 

10

 

Min.

 

5

 

Max.

 

20

 

Superheat °F

 

15

 

10

 

20

 

Design Condensing Temp. @ 95 °F 

Ambient

 

125

 

105

 

140

 

Suction Pressure (psig)- R407C

 

70

 

55

 

85

 

Suction Pressure (psig)- R410A

 

130

 

105

 

155

 

Fan Cycling Control- Fan On (psig)- 

R407C

 

320

 

240

 

340

 

Fan Cycling Control- Fan On (psig)- 

R410A

 

440

 

330

 

480

 

Fan Speed Control (psig)- R407C

 

320

 

-

 

-

 

Fan Speed Control (psig)- R410A

 

440

 

-

 

-

 

 

2.8.2

 

Saturated Refrigerant Pressure Tables 

The following refrigerant vapor pressure tables are provided 
for reference for R407C and R410A refrigerant.

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Содержание SCS Series

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

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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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