Installation, Operation and Maintenance manual 803 C – 01/05 A Date: May 2001 Supersedes: none PFS 106.1÷314.
Introduction Purpose of the manual The manual allows the installer and the operator to perform correctly all the operations required for the installation and maintenance of the chiller without provoking any damages to the unit or to the qualified personnel. Therefore the manual is essential to help qualified personnel that have to arrange the equipment to provide the correct installation in accordance with local codes and regulation.
Installation Before any operation please check the instruction for use. Warning Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations, and who are experienced with this type of equipment. Must be avoided the installation of the unit in places that could be considered dangerous for maintenance operations. Receiving and Handling Inspect the unit immediately after receipt for possible damage.
recommended. McQuay International is not responsible for damage or faulty operation from untreated or improperly treated water. Head pressure control, tower system The minimum entering water temperature to the condenser must not be lower than 18 °C at full tower water flow. If lower temperature water is used, the flow must be reduced proportionally. Use a three-way bypass valve around the tower to modulate the condenser water flow.
• When using a cooling tower, add glycol solution to the chilled water system. Freeze point should be approximately 6°C below minimum design ambient temperature. • Insulate field water piping, especially on the chilled water side. Note: Freeze damage is not considered a warranty failure and is not the responsibility of McQuay International. Water piping Due to the variety of piping practices, it is advisable to follow the recommendations of local authorities.
Flow direction marked on switch NPT flow switch connection Tee NOMINAL PIPE SIZE INCHES (MM) MINIMUM REQUIRED FLOW TO ACTIVATE SWITCH – LITERS PER SECONDS 5 (127) 6 (152) 8 (203) 3.7 5.0 8.8 Figure 4 – Flow Switch Table 1 Glycol Solutions Use industrial grade glycols only. Do not use an automotive grade antifreeze. Automotive antifreeze contains inhibitors that will cause plating on the copper tubes within the chiller evaporator.
PFS SE 2 passes evaporator water pressure drop PFS SE 2 passes condenser water pressure drop 803 C – 01/05 A – pag.
PFS XE 2 passes evaporator water pressure drop PFS XE 2 passes condenser water pressure drop 803 C – 01/05 A – pag.
Physical data PFS SE (standard efficiency) HFC 134a “PFS SE” Unit size Cooling capacity (1) Power input (1) COP (1) McQuay Screw compressors Refrigerant circuits Min % of capacity reduction Refrigerant charge HFC 134a Oil charge Evaporator Evaporators / water volume Max water operating pressure Condenser Condensers / water volume Max water operating pressure Weight and dimensions Shipping weight Operating weight Unit length Unit width Unit height 106.1 127.1 157.1 209.2 230.2 251.2 282.2 314.
803 C – 01/05 A – pag.
Screw compressors The newest StargateTM single-screw compressor has a well balanced compression mechanism which cancels the screw rotor load in both the radial and axial directions. Inherent to the basic single-screw compressor design is the virtually load-free operation, that gives main bearing design life of 3-4 times greater than twin-screws, and eliminates expensive and complicated thrust balancing schemes. The two exactly opposed gaterotors create two exactly opposed compression cycles.
Compressor maintenance The screw Frame 4 compressor does not required frequent maintenance. However, vibration is an excellent check for proper mechanical operation. Compressor vibration is an indicator of the requirement for maintenance and contributes to a decrease in unit performance and efficiency. It is recommended that the compressor be checked with a vibration analyzer at or shortly after start-up and again on an annual basis.
When the evaporator pressure reaches 0,3 bar, move switch Q0 to the “off” position. Remove the jump. Close the suction line valve. Remove and replace the filter-drier. Evacuate the lines through the liquid line manual shutoff valve to remove non condensables that may have entered during filter replacement. Open the suction line valve. A leak check is recommended before returning the unit to operation.
Preventive maintenance schedule PERIODICITY Operation Ref. No.
Charging the refrigerant 1. Connect the refrigerant bottle with a filling pipe to the filling valveon the evaporator head. Before firmly tightening the refrigerant botlle valve, open it and force the air out from the filling pipe. Tighten the charcing valve connection. 2. When the refrigerant stops to enter the system, start the compressor and complete the refrigerant charge. 3. When the exact quantity of refrigerant has been predetermined, check the liquid sight glass.
In warranty return material procedure Material may not be returned except by permission of McQuayService department. A "Return Goods" tag will be included with the returned material. This tag will all informations required to expedite handling at our factory. Return of the parts does not constitute an order for replacement. Therefore, a purchase order must be entered through our nearest Sales Representative.
We reserve the right to make changes in design and construction at any time without notice, thus the cover picture is not binding. McQuay Italia S.P.A. S.S. Nettunense, km 12+300 – 00040 Cecchina (Roma) Italia – Tel. (06) 937311 – Fax (06) 9374014 – E-mail: mcquay.italia @pcg.telpress. it.
