Yazaki Aroace WFC-SC10 Installation Instructions Manual
Also see for Aroace WFC-SC10: Installation instructionsInstallation
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16Figure 13 – Heat Medium PipingCAUTION1. DO NOT EXCEED 30 – 120% OFSTANDARD HEAT MEDIUM FLOW.2. DO NOT EXCEED 85.3 PSI (588 kPa) IN THEHEAT MEDIUM CIRCUIT AT THEABSORPTION CHILLER.3. DO NOT INSTALL ANY VALVES IN THEEXPANSION LINE.The key device required for the properoperation of the unit is a Heat MediumBypass Valve. When the unit requires heatmedium, it will send a signal to this valve toopen. When the unit does not require heatmedium, for whatever reason, this valve willbe commanded to move into bypassposition.Figure 14 – Heat Medium BypassValve (HMV) InstallationValves and actuators are available inaccessory kits and those kit items are usedin the illustration in Figure 14. The fact that aparticular brand or type of valve and actuatoris used in the accessory kit should not betaken as an endorsement or preference forthe brand of components used in theaccessory kit. Specific wiring instructionsare included in the accessory kit.A balancing valve should be installed atthe heat medium outlet to facilitate flow rateadjustments. An isolation valve should beinstalled at the heat medium inlet and mustremain fully open at all times when the unit isintended to operate.A balancing valve, usually a ball valve,should be used in the bypass line. Thisvalve should be used to set the pressuredrop through the bypass line to be equal tothe pressure drop through the heat mediumcircuit of the unit.AFTER LEAK TESTING, insulate thepiping to help prevent heat loss. Ensure thatall stop valves, balancing valves, andthermowells are accessible.FREEZE PROTECTIONWhen the chiller/chiller-heater and/orassociated piping are installed in a locationthat may be subjected to freezing conditions,appropriate freeze protection steps must betaken. Many methods are available but themost common method is the use of glycol.Glycol may be permitted for use in Yazakichiller-heaters with certain precautions:1. Do not use automotive glycol (Antifreeze) sinceit may contain chemical additives that could beinappropriate and potentially damaging to theYazaki chiller-heater. Use only glycolappropriate for use with copper tubing andbrass fittings.Exception: The heat medium circuit isconstructed of stainless steel so glycol used inthis circuit must not corrode that material.There is no copper or brass in this circuit.2. Do not exceed a mixture of 50% by weight.3. Be aware that loss of performance will resultwhen glycol is used. The impact can becomevery significant.4. Propylene Glycol is preferred over EthyleneGlycol. There is little difference in anti-freezecharacteristics, PG is non-toxic, and PG isalso less viscous than EG, reducing therequired pump power.5. Use of glycol can cause the unit to operate athigher internal temperatures. This may causefaster depletion of inhibitor than what may beperceived as normal. |
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