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SCW-410-QS (05/12) 

 

Page 13 

Antifreeze Protection 

When 

SCW compressor units 

are applied to radiant panel hydronic heating and/or chilled water 

cooling systems, the water circulating system must be protected from potential damage due to 
freeze-up by utilizing an adequate antifreeze solution. The antifreeze protection is provided by the 
installer prior to the EarthLinked

®

 system start-up. 

 

Propylene-glycol antifreeze solution with an inhibitor is the type of antifreeze solution required for 
Earthlinked

®

 products utilized in radiant panel hydronic heating and/or chilled water cooling 

systems. These systems shall be freeze protected consistent with the application -specific 
minimum temperature, as shown in the table below. Propylene-glycol antifreeze solutions should 
always be in the range of 20% to 50% by volume, as indicated in the table. 

 

TEMPERATURE, °F 

PROPYLENE GLYCOL, % 

WATER SOLUTION 

MULTIPLIER FACTOR (WSMF) 

18 

20 

x 1.03 

30 

x 1.07 

-7 

40 

x 1.11 

-29 

50 

x 1.16 

 Propylene Glycol Freeze Protection Table 

 

 

Propylene-glycol can be purchased in the straight form and mixed with an inhibitor prior to filling 
the system, or it can be purchased as inhibited propylene-glycol. The following are examples of 
manufacturers for the above: 

 

Straight propylene-glycol: Chemical Specialties, Inc. (

www.chemicalspec.com/spg.html

) 

Inhibitor: Nu-Calgon Products, Ty-lon B20  (

www.nucalgon.com/products

 

Inhibited propylene-glycol: Houghton Chemical Corp., SAFE-T-THERM

®

www.houghton.com/fluids/safe-t-therm/index.html

 

 

Summary of Contents for SCW Series

Page 1: ...ENTS PAGE Pre Installation 3 Placement Mechanical Information 5 System Application Options 12 Antifreeze Protection 13 Electrical and Sound Data 14 230 1 60 Internal Wiring 15 230 3 60 Internal Wiring...

Page 2: ...lure to provide installation and service by an authorized trained installer in a manner consistent with the subject manuals will void and nullify the limited warranty coverage for the system READ THE...

Page 3: ...W Contained in each compressor package compressor unit four L shaped hold down brackets service valves liquid and vapor adapters for service valves and earth loop line set product literature 2 All ser...

Page 4: ...SCW 410 QS 05 12 Page 4 Figure 2a General System Layout Figure 2b Typical SCW Compressor Unit Primary Circuit Plumbing...

Page 5: ...ompressor unit may be located in garage basement crawl space or utility room Avoid placing compressor unit in kitchen bedroom family living dining room areas In a condensate pan On vibration pads Atti...

Page 6: ...her than the earth loop manifolds Compressor unit may be located lower than the earth loop manifolds See Figure 2a For SCW compressor units providing radiant panel hydronic hot water or chilled water...

Page 7: ...the compressor unit using the adapters to right size to the proper earth loop line set Installation of the service valves will provide isolation of the earth loop system from the compressor unit and p...

Page 8: ...SCW 410 QS 05 12 Page 8...

Page 9: ...SCW 410 QS 05 12 Page 9 Figure 5 SCW Connections for R 410A...

Page 10: ...SCW 410 QS 05 12 Page 10 Figure 6 SCW Internal Flow Schematic...

Page 11: ...SCW 410 QS 05 12 Page 11 Figure 7 SCW Piping...

Page 12: ...SCW 410 QS 05 12 Page 12 System Application Options Figure 8 SCW Radiant Panel Hydronic Heating and Air Chilled Water Cooling...

Page 13: ...t with the application specific minimum temperature as shown in the table below Propylene glycol antifreeze solutions should always be in the range of 20 to 50 by volume as indicated in the table TEMP...

Page 14: ...e liquid concentration to assure that the correct mixture is obtained Electrical and Sound Data Compressor Model Voltage Phase Hz Voltage LRA RLA MCA MFS Sound Pressure Level 10 ft dB A Min Max 024 1C...

Page 15: ...SCW 410 QS 05 12 Page 15 Figure 10 SCW Electrical Ladder Diagram 230 1 60...

Page 16: ...SCW 410 QS 05 12 Page 16 Figure 11 SCW Electrical Schematic 230 1 60...

Page 17: ...SCW 410 QS 05 12 Page 17 Figure 12 SCW Series 230 3 60 Electrical Ladder Diagram...

Page 18: ...SCW 410 QS 05 12 Page 18 Figure 13 SCW Series 230 3 60 Electrical Schematic...

Page 19: ...SCW 410 QS 05 12 Page 19 Figure 14 Part 1 of 2 SCW Field Wiring Diagram Reference Figure 8...

Page 20: ...SCW 410 QS 05 12 Page 20 Figure 14 Part 2 of 2 SCW Field Wiring Diagram Reference Figure 9...

Page 21: ...hey are sealed Check the Pressure gage after 15 minutes and verify the original pressure has not decreased Repair any leaks and re test as appropriate 3 After venting the pressurized system connect th...

Page 22: ...tem pressure must not exceed 280 MICRONS WITHIN 5 MINUTES If pressure rises to greater than 280 microns open LP and HP valves crack the refrigerant valve and allow just enough refrigerant into the sys...

Page 23: ...e refrigerant container valve and disconnect the refrigerant hose from the charging port Note and document the amount of refrigerant 11 The system has now been initially charged Disconnect the Digital...

Page 24: ...ystem on in the COOL mode The charging process is detailed in the flow chart illustrated in Figure 21 When complete return to step 8 below 5 Initiate final charging by opening the refrigerant containe...

Page 25: ...ed to provide 10 F to 20 F or less superheat while running in cooling mode The first step is to utilize the access port and LP gage in Figure 19 to measure suction pressure Next apply a thermocouple a...

Page 26: ...re indicator read the suction temperature at the compressor suction port Read the suction pressure at the access port on the LP gage 11 Enter the Pressure Temperature Table in Figure 20 and for the su...

Page 27: ...eat is greater than 20 F wait for the ground surrounding the earth loops to warm up The TXV valve is factory set at MINIMUM superheat and the TXV cannot be further adjusted to decrease the superheat u...

Page 28: ...SCW 410 QS 05 12 Page 28 Figure 21 Charging and Superheat Adjustment Process...

Page 29: ...or 6 Adding liquid refrigerant will raise the liquid level in the ACC Continue to add liquid refrigerant to the system until the liquid level has reached the middle sight glass as shown in Figure 22 7...

Page 30: ...the Warranty Registration Card and inside the compressor unit on the electrical diagram for future reference This is the full system charge The system is now fully operational and needs no further ad...

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