WATER FIRED SINGLE-EFFECT ABSORPTION …

1 WATER FIRED single -EFFECTABSORPTION CHILLER AND CHILLER-HEATERThis product is a WATER FIRED ABSORPTION unit which provides chilled WATER for cooling or hotwater for heating in central plant type air conditioning systems. Units with nominal refrigeration capacities of 10, 20, and 30 tons are complete with operating and safety controls. The ABSORPTION chiller or chiller-heater is energized by a heat medium (hot WATER ) at 158oF to 203oFfrom a process, cogeneration, solar or other waste heat source. When this equipment is applied correctly, installed in accordance with Yazaki INSTALLATION INSTRUCTIONS and properly maintained, it will provide many years of troublefree ABSORPTION PRINCIPLE2 COOLING OPERATION2 HEATING OPERATION3 CONTROLS GENERAL INFORMATION5 CONTROL ADJUSTMENTS8 CONTROL SEQUENCE8 OPERATION COOLING10 HEATING10 REMOTE CONTROL10 WINTER SHUTDOWN10 Page SAFETY CONTROLS10 PRECAUTIONS10 MAINTENANCE GENERAL INFORMATION11 ROUTINE MAINTENANCE11 WINTERIZING11 WATER QUALITY12 TROUBLESHOOTING GUIDE12 ERROR CODES13 WARRANTY YAZAKI LIMITED EXPRESSWARRANTY15 OPERATING INSTRUCTIONSWFC-SC10, 20, 30 WFC-SH10, 20.

2 30 GENERAL2 These instructions are intended to acquaintthe Owner/End User with the operation and general maintenance requirements of YazakiWater FIRED SINGLE-EFFECT ABSORPTION Chiller orChiller-Heater read ALL instructions carefully andobserve precautions. Failure to operate and maintain this equipment in accordance with theOPERATING INSTRUCTIONS may affect theequipment performace and product the equipment does not operate as expected, check the Troubleshooting Guide inthese instructions BEFORE calling yourAuthorized Yazaki Service Provider. Thisapproach will not only save cost but also avoidany unnecessary PRINCIPLEY azaki ABSORPTION chillers or chiller-heatersuse a solution of lithium bromide and WATER , under a vacuum, as the working fluid.

3 WATER is the refrigerant and lithium bromide is theabsorbent. During cooling operation, refrigerantliquid boils under the influence of a deep vacuum in the evaporator and creates a refrigerating effect which removes heat from thechilled WATER circuit. The SINGLE-EFFECT absorptioncycle has one generator heated by an externalsource of hot WATER , a condenser, evaporator and absorber. The absorber and condenser arewater cooled and heat is normally rejectedthrough a cooling OPERATIONG eneratorWhen the heat medium inlet temperatureexceeds (203oF max.) the solution pump forces dilute lithium bromide solution intothe generator. The solution boils vigorously under a vacuum and droplets of concentratedsolution are carried with refrigerant vapor to theprimary separator.

4 After separation, refrigerantvapor flows to the condenser and concentratedsolution is precooled in the heat exchanger before flowing to the the condenser, refrigerant vapor is condensed on the surface of the cooling coil andlatent heat, removed by the cooling WATER , isrejected to a cooling tower. Refrigerant liquidaccumulates in the condenser and then passesthrough an orifice into the the evaporator, the refrigerant liquid isexposed to a substantially deeper vacuum than in the condenser due to the influence of theabsorber. As refrigerant liquid flows over the surface of the evaporator coil it boils and removes heat, equivalent to the latent heat of the refrigerant, from the chilled WATER circuit.

5 Therecirculating chilled WATER is cooled to and the refrigerant vapor is attracted to deep vacuum in the absorber is maintained by the affinity of the concentratedsolution from the generator with the refrigerantvapor formed in the evaporator. The refrigerantvapor is absorbed by concentrated lithium bromide solution flowing across the surface of the absorber coil. Heat of condensation and dilution are removed by the cooling WATER andrejected through a cooling tower. The resultingdilute solution is preheated in the heat exchanger before returning to the generator where the cycle is OPERATIONG eneratorWhen the heat medium inlet temperatureexceeds (203oF max.) the solution pump forces dilute lithium bromide solution intothe generator.

6 The solution boils vigorously under a vacuum to generate refrigerant vapor and droplets of concentrated solution. Since the changeover valve is open during heating operation, the mixture of refrigerant vapor andconcentrated solution flows directly into the evaporator. Some refrigerant vapor flows through the condenser before reaching the SINGLE-EFFECT ABSORPTION CYCLE (COOLING) SINGLE-EFFECT ABSORPTION CYCLE (HEATING)EvaporatorHot refrigerant vapor condenses on the surface of the evaporator coil and heat, equivalent to the latent heat of the refrigerant, istransferred to the hot WATER circuit. The recirculating hot WATER is heated to liquid mixes with concentrated lithium bromide solution and the resulting dilutesolution returns to the generator where the cycleis INFORMATIONA control panel, shown in Fig.

7 3, is builtinto each ABSORPTION chiller or chiller-heater and is located on the control box, behind the frontpanel as shown in Fig. 4. After inspecting the control panel or changing the mode of operation,make sure that the front panel is replaced andsecured with screws to prevent rain from entering the cabinet and unauthorized tamperingwith the controls. The chiller or chiller-heater may also besupervised and controlled by external control systems when the necessary interconnections are installed. Additional controls and interlockscan be explained by your Authorized YazakiService COOLING or HEATING operation isselected and the unit is started, the chiller orchiller-heater will function automatically andremain in operation as long as there is a demand for chilled WATER or hot WATER .

8 The heatmedium pump or bypass valve is cycled ON and OFF to control flow of heat medium through the generator in response to thechilled/hot WATER temperature. When the chilledwater temperature is satisfied, the solution isautomatically diluted and the cooling WATER pump is stopped after 4 Mode Switch (chiller-heater only) CONTROL PANELH eating Operation Lamp(chiller-heater only)Cooling Operation LampHeating Mode Switch(chiller-heater only)Power ON LampAlarm ResetError CodeRun LampStop LampStandby Mode LampFreeze Protection ON LampREMOTE-STOP-RUN SwitchERROR RUNPRETIME6 Chiller or Chiller-HeaterFig. 4 LOCATION OF CONTROLSFuse PanelREPLACEMENT FUSESSYMBOLRATINGTYPEFT1, FT25 AFuji ModelF11, F122 AFGAO-2 ratedF42A250V ACBussmannF23 AModel GLQ-3,GMQ-3 orGMQ-32/10 Fuses must be replaced with the samemodel and rating.

9 DO NOT USE a PUMP THERMALOVERLOAD SETTINGS (A) 208V, 60Hz, 3 ph. power supplymust be within voltage tolerances of+10% and -5%.7 Adjustment ScrewPush and release to RESETS olution Pump Thermal OverloadCAUTIONFOR YOUR SAFETY DO NOT TOUCH ANYLIVE ELECTRICAL PARTS. ELECTRICSHOCK CAN CAUSE INJURY OR 4 LOCATION OF CONTROLSC ontrol BoxSolution Pump Thermal Overload (THRP)Fuse Panel (FT1, FT2, F2, F4, F11 and F12)CPU BoardI/O BoardWFC-TRUL1 MPTHRPC ontrol HarnessTR-LV8 CONTROL ADJUSTMENTSThe leaving chilled WATER and hot WATER temperature controls are set at the factory to theStandard Specifications shown in Fig. 5. YourAuthorized Yazaki Service Provider can adjust the setpoints with the ACT-3 maintenance checker to accommodate step control onmultiple units or satisfy alternative design temperatures, however, the differential is standard factory setpoints are adjustablefrom to (leaving chilled WATER ) to (leaving hot WATER ).

10 WATER Outlet Temperature (oF) Standard Rating Point Standard Control SettingsFig. 5 TEMPERATURE CONTROL ADJUSTMENTSCONTROL SEQUENCEA built in microprocessor in the chiller orchiller-heater controls the external pumps andheat medium bypass valve (if installed) inresponse to the cooling and heating load. Theoperating sequence of each pump and the coolingtower fan after start-up, during normal operationand after a normal stop or abnormal shutdown isshown in Fig. 6. It is important that the chiller orchiller-heater have control over the pumps toallow for controlled shutdown under normal andabnormal conditions. Capacity (%)COOLING1007550250 Capacity (%)Minimum LimitMaximum WATER Outlet Temperature (oF)Minimum LimitMaximum LimitNormal StopBy Temp ControlStartHM PumpOn (Note)C/H WaterPump OnC/HWTR/PumpOPGNoYe sStopC/HWaterTempOperationHeatingCLG/HTG C oolingCW Pump OnNoCWPumpOPGYe sHeatingCLG/HTGCWTempLowCoolingNoCTF OnNormalOperationYe sHM Pump Onor HM BypassValve OpenCooling WATER Temp.