Related Manuals for Stulz SCS Series
Summary of Contents for Stulz SCS Series
- Page 1 SCS Series Installation, Operation and Maintenance Manual Remote Air Cooled Condensers For Indoor Cooling Systems...
- Page 2 SA - Variable Speed Control EC - Variable Speed Control (Electronically Commutated Fans) Single Dual Dual 1366 SCS Series Micro-Channel Condensers Nomenclature SCS-MC-XXX-XXX-XX Single AA - Fan Cycle Control SA - Variable Speed Control Single D EC - Variable Speed Control O - Standard...
- Page 3 Unpublished — rights reserved under the copyright laws of the United States and of other countries. Other brands and tradenames are trademarks of their respective owners. Copyright 2017 by STULZ Air Technology Systems, Inc. Printed in the United States of America. All rights reserved.
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Page 4: Table Of Contents
-SCS C IOM M ONDENSER ANUAL Table of Contents 2.6.1.2 Receiver Heater Wiring ..........14 System Charging ............14 2.7.2 Estimating Refrigerant Charge ........ 15 Introduction…………………...…..………………….1 2.7.3 Preparing System For Charging ....... 17 General................1 2.7.4 Refrigerant Charging Procedures ......18 Product Description ............ - Page 5 SCS C IOM M ONDENSER ANUAL Tables Figures Table 1. Fan Cycling Pressure Control Settings ..... 6 Figure 1. Typical Layout- SCS Condenser ......4 Table 2. Variable Fan Speed Control Settings....6 Figure 2. Typical Layout- SCS-MC Condenser ....4 Table 3.
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Page 6: Introduction
Any use beyond this is 1.2.1 Capabilities and Features deemed to be not intended. STULZ is not liable for any damage • All aluminum cabinet construction resulting from improper use. The unit is designed to be installed •... -
Page 7: Safety
A lock- out tag-out procedure should be 1.3.1 General followed to ensure that power is not inadvertently STULZ Air Technology Systems, Inc. uses NOTES reconnected. along with CAUTION and WARNING symbols All personnel working on or near equipment should be throughout this manual to draw your attention to familiar with hazards associated with electrical maintenance. -
Page 8: General Design
1–2 CFM (.03 - .06 M³/minute). General Design STULZ SCS series remote air cooled condensers are housed in an aluminum frame cabinet and are rated for outdoor use. The figures that follow depict the two types of condensers and identifies the major components. - Page 9 -SCS C IOM M ONDENSER ANUAL Figure 1. Typical Layout- -SCS Condenser Figure 2. Typical Layout- -SCS-MC Condenser...
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Page 10: Fan Assembly
A/C unit. The STULZ SCS-MC condenser design differs in that receivers 1.5.2 Variable Condenser Fan Speed are integrally mounted to the condenser Frame (See Figure 2). -
Page 11: Flooded Head Pressure Control
-SCS C IOM M ONDENSER ANUAL Table 1. Fan Cycling Pressure Control Settings 1st Fan 2nd Fan 3rd Fan 4th Fan Refrigerant Type Cut-in Cut-out Cut-in Cut-out Cut-in Cut-out Cut-in Cut-out R407C 320 psig 240 psig 330 psig 250 psig 340 psig 260 psig 345 psig... -
Page 12: Flooded Head Pressure Control Diagram
SCS C IOM M ONDENSER ANUAL Figure 3. Flooded Head Pressure Control Diagram... -
Page 13: Installation
The unit should always be stored STULZ ships all equipment FOB factory. STULZ is not liable in a dry location prior to installation. To prevent damage for any equipment damage while in transit. STULZ can assist when lifting the unit, all available lifting eyes on the cabinet in the claim filing process with the freight carrier. -
Page 14: Side Clearance
SCS C IOM M ONDENSER ANUAL such as trees and buildings to provide a shaded location. This will minimize the solar load on the unit. Avoid ground level sites that are accessible to the public. Ensure the mounting location can support the weight of the equipment. Refer to the installation drawing for the non- charged system weight. -
Page 15: Receiver
-SCS C IOM M ONDENSER ANUAL outlet pipes within one foot of the condenser header to prevent undue stress on soldered connections (see Figure 4). The STACK refrigerant piping should be isolated by vibration isolating 10 FT. MAX. FLOW supports. Provide supports (clamps or hangers) as necessary every 5 to 10 feet along piping runs to minimize vibration and noise transmission. -
Page 16: Discharge Line
SCS C IOM M ONDENSER ANUAL Discharge line velocities must be a minimum of 500 fpm for condenser with consideration to elevation changes. Each horizontal runs and 1,000 fpm for vertical risers to ensure oil is valve, fitting and bend in the refrigerant line must also be returned to the compressor at both full and partial load considered in this calculation. -
Page 17: Liquid Line
-SCS C IOM M ONDENSER ANUAL 2.5.1.2 Liquid Line The velocity of refrigerant in the liquid line is less critical because liquid refrigerant and oil are mixed thoroughly in the liquid state. The main concern when sizing the liquid line is to maintain a solid head of liquid refrigerant entering the thermostatic expansion valve (TXV). -
Page 18: Receiver Pipe Installation (Scs Condenser Only)
SCS C IOM M ONDENSER ANUAL 2.5.3 Receiver Pipe Installation (FLA), the current that the unit will draw under full design load, the minimum circuit ampacity (MCA) for wire sizing, and (SCS condenser only) the maximum fuse or HACR (Heating, Air Conditioning, Receiver inlets and outlets are equipped with RotoLock Refrigeration) breaker size (MAX FUSE/CKT BKR) for valves that must have brazed pipe connections. -
Page 19: Condenser Enable Feature
-SCS C IOM M ONDENSER ANUAL the remote condenser terminal board. If control wires aren’t installed (and the jumper remains in place), the condenser is always enabled and will turn on and off based on the condenser’s pressure control switch setting(s). The condenser enable feature may be used in high ambient temperature locations to prevent the condenser from running unnecessarily. -
Page 20: Estimating Refrigerant Charge
SCS C IOM M ONDENSER ANUAL higher pressures than R407C, which must be considered when checking the operating temperatures/pressures while charging or troubleshooting the system. 2.7.2 Estimating Refrigerant Charge When charging a system with R407C or R410A refrigerant it will be necessary to weigh in the refrigerant. Calculate the amount of refrigerant needed by adding the amount of refrigerant required for the A/C unit (shown in the A/C unit IOM provided separately) plus the refrigerant for the condenser (Table 5 and Table 6) plus the refrigerant piping (Table 7). -
Page 21: Table 6. -Scs-Mc Condenser Refrigerant Charge Figure 6. Weights (Lb)
-SCS C IOM M ONDENSER ANUAL Table 6. SCS-MC Condenser Refrigerant Charge Weights (lb) R407C Charge R407C Charge R410A Charge R410A Charge (Condenser (Condenser (Condenser (Condenser Less Receiver) With Receiver) Less Receiver) With Receiver) Model Number -20°F Ambient & -20°F Ambient & -30°F Ambient -30°F Ambient Higher... -
Page 22: Preparing System For Charging
SCS C IOM M ONDENSER ANUAL NOTE: Use high quality hoses ensuring they are free of Example: Estimate the amount of refrigerant required for a defects and don’t leak. It is recommended to use system using R407C refrigerant consisting of a 5 ton A/C unit copper tubing instead of hoses if possible due to the connected with a 1/2”... -
Page 23: Refrigerant Charging Procedures
Information for you on the Warranty Registration and Start- pressures are correct for the type of refrigerant used. Refer to up Checklist and ensure it is filed with STULZ for your the tables in section 2.8 for the operating temperatures and warranty protection. -
Page 24: F Flooded Head Pressure Control
SCS C IOM M ONDENSER ANUAL Block off the intake air to the condenser with cardboard NOTE: It is important not to exceed 80% of the total until a constant discharge pressure can be obtained. This condenser and receiver volume to allow room for expansion. will lower the possibility of overcharging (for units with The most accurate way to determine the total system fan cycling only). -
Page 25: Final Adjustment
-SCS C IOM M ONDENSER ANUAL NOTE: The operating pressures for R410A refrigerator R410A) or your summer maximum operating head pressure. significantly higher than R407C. Hold the pressure steady at this setting. You should observe that cycling “Off” on head pressure will not occur now or during warmer temperatures. - Page 26 SCS C IOM M ONDENSER ANUAL R410A Refrigerant R410A Refrigerant Tempera Pressure -ture (ºF) (psid) Tempera Pressure Saturated Evaporating -ture (ºF) (psid) Temperature Saturated Evaporating Temperature 78.4 Dew Point Saturated 81.9 Vapor 85.5 37.9 89.2 40.1 93.1 42.3 97.0 44.7 47.1 49.6 52.1...
- Page 27 -SCS C IOM M ONDENSER ANUAL The refrigerant then flows to the condenser coil. The high temperature, high-pressure gas from the compressor is cooled by the flow of air through the condenser coil and is condensed into a high-pressure liquid. For cold weather applications using flooded head pressure control, the low temperature high-pressure liquid refrigerant flows to a receiver.
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Page 28: Start-Up/Commissioning
NOTE: A Warranty Registration and Start-Up Checklist is provided with the unit data package. It should be completed during start-up and sent to STULZ. This checklist should be used as a guideline for items that need to be confirmed during start-up. -
Page 29: Periodic General Maintenance
3. Inspect the unit’s components visually. Use copies of the Periodic General Maintenance Checklist in this manual (see Appendix A) to record periodic general maintenance inspections. For assistance, contact STULZ Product Support. Ensure your adherence to all safety statements while performing any type of maintenance. -
Page 30: Refrigerant Piping
SCS C IOM M ONDENSER ANUAL refrigerant charge before attempting repairs. Adjacent piping All electrical connections should be checked to be sure that must be thoroughly cleaned by removing all paint, dirt and oily they are tight and properly made. Check all switches, film. - Page 31 -SCS C IOM M ONDENSER ANUAL Symptom Probable Cause Recommendation Low condenser airflow. (Indicated Open air passages. by excessive warm air leaving the Clean coil. condenser fan). Check condenser fan(s). Air or other non-condensable gas Reclaim system and recharge. Install a new drier strainer. Head Pressure Too in system High...
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Page 32: Product Support
SCS C IOM M ONDENSER ANUAL • Purchase Order Number PRODUCT SUPPORT • Date of Order STULZ Product Support offers technical support and parts as well • STULZ Stated Part Price as these services: • Billing Address • Performance Evaluations •... - Page 33 -SCS C IOM M ONDENSER ANUAL Checklists Installation Checklist Tasks Comments Proper clearances for service access have been maintained around equipment. Equipment is level and mounting fasteners are tight. If required, piping completed to refrigerant or coolant loop. All field installed piping leak tested. If required, refrigerant charge added.
- Page 34 SCS C IOM M ONDENSER ANUAL Maintenance Checklist Model Prepared by Number Title Item Number Serial Date Number Monthly Filters Fans Condensate Drain Fan(s) rotate Cleanliness Drain is open No obstructions Condensate pan safety switch operates freely Additional Check chilled water/hot water circuits for air (bleed as required) Coils clean and clear of obstructions Semi- Humidifier cylinder and controls operate properly...
- Page 35 Thermal Resistance Refrigeration Horse Power Safety Data Sheet Hertz SPDT Single Pole, Double Throw Indoor Air Quality STULZ STULZ Air Technology Systems, Inc. in. w.g. Inches of Water Gauge Volt Kilo Volt Amps Volt, Alternating Current Kilowatt Variable Frequency Drive...
- Page 36 North American Headquarters 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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Questions and answers
what are the procedures used in nitrogen pressure testing after gas leakage has been dictated in the system
If a gas leak is detected in the Stulz SCS Series system, follow these nitrogen pressure testing procedures:
1. Pressurization: Pressurize the system with dry nitrogen to 150 psig.
2. Observation: Monitor the standing pressure over time.
3. Slow Pressure Rise: If the pressure rises slowly (up to 200 microns in 15 minutes), ensure all service and solenoid valves are open, as moisture may still be present in the system.
4. Rapid Pressure Rise: If the pressure rises rapidly (more than 50 microns per minute) up to atmospheric pressure, this indicates an undetected leak.
5. Leak Detection: Identify leaks by checking for changes in standing pressure after 12 hours. A significant drop in pressure confirms a leak.
6. Repair and Retest: Repair any leaks found, then restart the initial evacuation process from step #3.
These steps ensure the system is properly sealed before proceeding with further operations.
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