WFC-SC10, 20, 30 WFC-SH10, 20, 30 OPERATING INSTRUCTIONS WATER FIRED SINGLE-EFFECT ABSORPTION CHILLER AND CHILLER-HEATER This product is a water fired absorption unit which provides chilled water for cooling or hot water 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.
GENERAL These instructions are intended to acquaint the Owner/End User with the operation and general maintenance requirements of Yazaki Water Fired Single-Effect Absorption Chiller or Chiller-Heater units. Please read ALL instructions carefully and observe precautions. Failure to operate and maintain this equipment in accordance with the OPERATING INSTRUCTIONS may affect the equipment performace and product Warranty.
Fig.1 SINGLE-EFFECT ABSORPTION CYCLE (COOLING) HEATING OPERATION Generator When the heat medium inlet temperature exceeds 154.4oF (203oF max.) the solution pump forces dilute lithium bromide solution into the generator. 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 and concentrated solution flows directly into the evaporator.
Evaporator Hot refrigerant vapor condenses on the surface of the evaporator coil and heat, equivalent to the latent heat of the refrigerant, is transferred to the hot water circuit. The recirculating hot water is heated to 131oF. Refrigerant liquid mixes with concentrated lithium bromide solution and the resulting dilute solution returns to the generator where the cycle is repeated. Fig.
CONTROLS GENERAL INFORMATION A control panel, shown in Fig. 3, is built into each absorption chiller or chiller-heater and is located on the control box, behind the front panel as shown in Fig. 4. After inspecting the control panel or changing the mode of operation, make sure that the front panel is replaced and secured with screws to prevent rain from entering the cabinet and unauthorized tampering with the controls.
Chiller or Chiller-Heater F11 F2 208V 2A 24V 3A F12 F4 208V 2A 24V 2A REPLACEMENT SYMBOL RATING FT1, FT2 5A F11, F12 2A F4 2A FT1 F2 208V 5A FT2 3A FUSES TYPE Fuji Model FGAO-2 rated 250V AC Bussmann Model GLQ-3, GMQ-3 or GMQ-32/10 Fuses must be replaced with the same model and rating. DO NOT USE a substitute. 208V 5A Fuse Panel Fig.
Solution Pump Thermal Overload (THRP) Fuse Panel (FT1, FT2, F2, F4, F11 and F12) WFC-TRUL1 MP THRP CPU Board Control Harness I/O Board TR-LV Control Box SOLUTION PUMP THERMAL OVERLOAD SETTINGS (A) MODEL SYMBOL 208V WFC-SC10 THRP 0.4 WFC-SH10 WFC-SC20 THRP 0.7 WFC-SH20 WFC-SC30 THRP 2.0 WFC-SH30 Adjustment Screw Push and release to RESET Solution Pump Thermal Overload The 208V, 60Hz, 3 ph. power supply must be within voltage tolerances of +10% and -5%.
CONTROL ADJUSTMENTS The leaving chilled water and hot water temperature controls are set at the factory to the Standard Specifications shown in Fig. 5. Your Authorized Yazaki Service Provider can adjust the setpoints with the ACT-3 maintenance checker to accommodate step control on multiple units or satisfy alternative design temperatures, however, the differential is fixed. The standard factory setpoints are adjustable from 59.9oF to 41.9oF (leaving chilled water) and 122.9oF to 140.
START-UP OPERATION Normal Operation Start HM Pump On (Note) C/H Water Pump On C/H WTR/Pump OPG OL Normal Abnormal Stop Stop Normal Stop By Temp Control Yes No C/H Water Temp Yes C/H Water Temp No Operation Stop Operation Chilled Water Temp. Control (Std) 50.9oF On WT1 Off Hot Water Temp. Control (Std) 126.5oF On WT4 o 43.7 F WFC-SC/SH Heating Off 135.
OPERATION COOLING HEATING 1. Select STOP on the REMOTE-STOP-RUN switch to stop heating operation. (If currently operating in the heating mode.) 2. Push COOLING on the control panel to select cooling mode. (Automatic selection on chillers.) 3. Select RUN on the REMOTE-STOP-RUN switch to start cooling operation. (Cooling operation will commence 30 minutes after heating operation is stopped.) 1. Select STOP on the REMOTE-STOP-RUN switch to stop cooling operation. (If currently operating in the cooling mode.
MAINTENANCE GENERAL INFORMATION ALL MAINTENANCE SHOULD BE PERFORMED BY SKILLED, EXPERIENCED PERSONNEL. Your Authorized Yazaki Service Provider can help you establish a standard maintenance procedure. For your safety, keep the area around the equipment clear and free of combustible materials, gasoline and other flammable substances. DO NOT obstruct service access to the equipment.
WATER QUALITY It is the Owner/End User’s responsibility to have the cooling water analyzed and chemically treated (as often as necessary) so that it conforms to the limits specified in Table 1. The CHILLED/ HOT WATER HEAT MEDIUM COOLING WATER MAKE-UP WATER 6.8 - 8.0 7.0 - 8.0 6.5 - 8.2 6.8 - 8.
SYMPTOM: Poor cooling capacity POSSIBLE CAUSE Poor vacuum Low heat medium inlet temperature High cooling water inlet temperature Low cooling water flow Fouling in the condenser and absorber REMEDY Evacuate noncondensible gases from the vacuum section through service valves A and B. Check the heat medium inlet temperature. Increase the temperature if it is below the original design conditions (max. 203oF). Check for Error Code E37 on the control panel.
ERROR CODE DESCRIPTION E29-E32 NA E33 CTI (cooling water temperature sensor) wire open circuit E34-E36 NA REMARKS Shutdown when open circuit (<14.4oF) detected for 5 sec. anytime 10 min. after P2 starts. Automatic reset after repair (>39.2oF). High cooling water inlet temperature Shutdown when high temp. exceeds 95oF for 5 sec. anytime 3 min. after P2 starts. Manual reset required after cause eliminated. E38 High heat medium inlet temperature Shutdown when high temp. exceeds 204.8oF for 5 sec.
WARRANTY YAZAKI LIMITED EXPRESS WARRANTY 1. 2. 3. 4. 5. 6. 7. 8. 9. Scope of Coverage. The Limited Express Warranty of Yazaki Energy Systems, Inc ( Company ) applies to the initial retail purchaser and assigns ( Customer ) of Yazaki water fired chillers and chiller-heaters ( Product ) installed in the U.S.A., Canada and Mexico. General Express Warranties.
AUTHORIZED YAZAKI SERVICE PROVIDER For information concerning service, operation or technical assistance, please contact your Authorized Yazaki Service Provider or the following: YAZAKI ENERGY SYSTEMS, INC. 701 E. PLANO PARKWAY, SUITE 305, PLANO, TEXAS 75074-6700 Phone: 469-229-5443 Fax: 469-229-5448 Email: yazaki@yazakienergy.com Web: www.yazakienergy.com This symbol on the product’s nameplate means it is listed by UNDERWRITERS LABORATORIES, INC.
