Yazaki Aroace WFC-SC10 Installation Instructions Manual
Also see for Aroace WFC-SC10: Installation instructionsInstallation
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15COOLING WATER PIPINGFigure 11 – Cooling Water PipingCAUTION1. DO NOT EXCEED 100 – 120% OFSTANDARD COOLING WATER FLOW.2. DO NOT EXCEED 85.3 PSI (588 kPa) IN THECOOLING WATER CIRCUITS AT THEABSORPTION CHILLER.3. DO NOT INSTALL ANY VALVES INEXPANSION LINES, WHEN USED.If possible, the cooling tower should beinstalled at the same level or above the levelof the chiller-heater. If this is not possible,give careful consideration to the preventionof drain-back and loss of cooling water dueto overflow of the tower. Such matters mustbe given prior consideration by the designengineer.As with the chilled water connections, abalance valve should be installed on thecooling water outlet and a stop valveinstalled on the cooling water inlet. Bothvalves should be in close proximity to thechiller. After thoroughly testing for leaks,insulate the piping circuit, ensuring anadequate vapor barrier is obtained. Be sureto allow access to any valves, wells, andports that may be present.Additionally, there should be flush anddrain valves installed between the machineand the balance/stop valves so as to allowfor flushing of the absorber-condenser coilsshould it ever become necessary.One important element in the coolingwater piping is the Cooling Water Crossover(not used on 10 ton units). This is always field-supplied. It is recommended that balancevalves be installed on the outlets of both theCondenser and Absorber in order to be ableto properly balance the flow through eachtubing bundle in accordance to the PressureDrop in Unit tag. The crossover tubing sizesare listed below.Figure 12 – Crossover PipingMODELWFC-COPPER TUBING STEEL TUBINGA B A BSC/SH20 3" 2" 3-1/2" 2-1/2"SC/SH30 3" 2-1/2" 4" 3"SC50 4" 3" 5" 3-1/2"If piping size reduction is required, it should be done at the unit.All sizes listed are minimum sizes.Table 4 – Crossover Piping Tube SizesCROSSOVER PIPING NOTES:1. Installing flow balancing valves in each circuitoutlet is recommended.2. Install cooling water flow valves at least 5 pipediameters upstream and/or downstream oftheir respective “T” fittings.3. The crossover pipe configuration must allow forclear access to the rear of the chiller formaintenance.HEAT MEDIUM PIPINGThe Heat Medium Piping contains the hotwater to drive the absorption system.Provided this water remains between 158-203°F (70-95°C), refrigerant vapor can begenerated in a usable quantity. If a mixingvalve is to be used to control thistemperature, IT MUST NOT BE COMBINEDWITH THE HEAT MEDIUM BYPASSVALVE. It MUST be a separate and distinctcontrol. |
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