WFC-SC10, 20, 30, 50 WFC-SH10, 20, 30 INSTALLATION INSTRUCTIONS WATER-FIRED SINGLE-EFFECT ABSORPTION CHILLER This product is a water-fired single-effect absorption unit which provides chilled water for cooling in central plant type air conditioning systems. WFC-SH model chillerheaters also provide hot water for heating in two-pipe central plant type systems. Units with nominal refrigeration capacities of 10, 20, 30, and 50 tons are complete with operating and safety controls.
GENERAL This equipment should only be installed by trained and qualified personnel who are familiar with absorption chillers. All precautions in these instructions, as well as on tags and labels attached to the unit, must be observed to ensure the safety of the personnel and maintain warranty validation. CAUTION THE YAZAKI WARRANTY WILL BE VOIDED IF THE FOLLOWING RESTRICTIONS ARE NOT OBSERVED: 1.
STANDARD SPECIFICATIONS Specifications Cooling Capacity Piping Construction Electrical Heat Medium Cooling Water Chilled/Hot Water Heating Capacity Cooling Heating Evaporator Pressure Loss Max Operating Pressure Rated Water Flow WFCMBTUh (kW) MBTUh (kW) Water Retention Volume Heat Rejection Temperature Cooling Absorber Pressure Loss °F (°C) °F (°C) PSI (kPa) PSI (kPa) GPM (l/s) % of Rated Gal (liters) MBTUh (kW) °F (°C) PSI (kPa) Condenser Pressure Loss PSI (kPa) Max Operating Pressure Rated Wa
EQUIPMENT DIMENSIONS (Drawings are not to scale) WFC-(SC,SH)10 WFC-(SC,SH)20 4
WFC-(SC,SH)30 WFC-SC50 5
TYPICAL SYSTEM DESIGN EXAMPLE OF A SINGLE MODULE EXAMPLE OF MULTIPLE MODULES 6
WIRING DIAGRAMS Figure 1 – Internal Wiring Diagram 7
SYMBOL TERMINALS LOCATION INTERNAL WIRING REMARKS SYMBOL Control Box Field wiring connections Junction Box Control Box (I/O Board) Molex Connector CVR Changeover valve Only on SH models F2, F4, F11, F12, FT1, FT2 Fuses Refer to Fuse Rating Table HWT TERMINAL 3 (P1E) 4 (P2E) 5 (FE) 6 (P3E) CM1 DESCRIPTION Chilled/hot water pump safety interlock Cooling water safety interlock Cooling tower fan safety interlock Heat medium pump safety interlock REMARKS Common to terminals CP, CTF, P, P3A, P3B
OPTIONAL CONTROL BOX CONNECTIONS TERMINAL 2, 3 on CN11 (FS2) S9, S10 (BO) TB1-7, TB1-8 (ST2) DESCRIPTION Cooling water flow switch Auxiliary boiler control relay Safety shut down TERMINAL REMARKS Field-installed option TB1-9, TB1-10 Dry contact, 24v, 60va max load. Closes at 185°F (85°C), Opens at 194°F (90°C). Shuts unit down in under 6 seconds. Configurable for NC or NO contacts.
Figure 3 – Field Wiring Diagram as Supplied in the Junction Box INSTALLATION RIGGING AND MOVING When the absorption chiller or chillerheater is delivered, it should be inspected for transit damage. Should any damage be found, do not proceed with installation until the Yazaki distributor has been notified and any required remedial actions have been completed. A B, C SC/SH10 93 (2060) 63 (1600) Remember to properly plan the route to the installation site.
3. Do not simply tip the unit over onto its back. It should be lifted and turned to the horizontal configuration while fully supported and suspended, though it only need be barely off the ground while turning. When rigging for overhead lift, attach shackle bolts to the lifting lugs. Bring the four individual rigging cables together at a point high enough that the angle between the rigging line and the top of the unit is no less than 60°, as shown in the Figure 4.
LOCATION AND CLEARANCES Particular care must be taken when placing the machine so as to provide adequate clearance for access to each side of the machine. Maintenance is mostly done through the front of the unit, but in a repair scenario, any panel on any side may need to be removed to access components behind them. The minimum space requirements shown below must be provided around and above each unit for installation and service access. Unit WFCSC10 SC20 SC30 SC50 SH10 SH20 SH30 Installation Area A B 67.
WFC-(SC,SH)10, 20, 30 WFC-SC50 Units Only Figure 7 – Securing the Unit to the Foundation LEVELING WFC-S Series units must be level in order for the fluids to be distributed properly over their respective tube bundles. There is a level bar mounted on the front of the main vessel of the machine, right above the control box. The unit must be level to both the longitudinal and transverse alignments. It is essential that all leveling be completed before any piping connections are attempted.
in this document. The values on the tag must be used in lieu of any other values. During the run test at the factory, the pressure drop listed on this tag was observed to be the exact pressure drop of the unit when all other conditions were at the design conditions. Each chiller in a group may have individual and unique values as no two tubing bundles are exactly alike.
supplied. It is recommended that balance valves be installed on the outlets of both the Condenser and Absorber in order to be able to properly balance the flow through each tubing bundle in accordance to the Pressure Drop in Unit tag. The crossover tubing sizes are listed below. COOLING WATER PIPING Figure 11 – Cooling Water Piping CAUTION 1. DO NOT EXCEED 100 – 120% STANDARD COOLING WATER FLOW. OF 2. DO NOT EXCEED 85.3 PSI (588 kPa) IN THE COOLING WATER CIRCUITS AT THE ABSORPTION CHILLER. 3.
A balancing valve should be installed at the heat medium outlet to facilitate flow rate adjustments. An isolation valve should be installed at the heat medium inlet and must remain fully open at all times when the unit is intended to operate. A balancing valve, usually a ball valve, should be used in the bypass line. This valve should be used to set the pressure drop through the bypass line to be equal to the pressure drop through the heat medium circuit of the unit.
ELECTRICAL Figure 15 – Junction Box Each absorption chiller/chiller-heater is factory-wired for the specific voltage listed on the Unit Nameplate. The standard field wiring connections are provided in the junction box located on the left side of the unit on all models except for the WFC-SC50 model which has the junction box located at the back. in areas where power supply voltage is known to be unstable. Phase rotation should be checked at these terminations as well.
CONTROLLING PUMPS AND VALVES The unit logic should control the pumps and/or heat medium bypass valve rather than any remote system such as BMS. Field-supplied voltage is provided to terminal CM1 in the junction box. This voltage is then controlled through dry-contact relays by the unit logic. See Figure 3 – Controls Wiring Diagram for further details. 1. Chilled Water Pump Control: The unit logic will output the voltage provided to terminal CM1 to terminal P when the chilled/hot water pump is demanded.
When the CTI sensor indicates the cooling water inlet temperature to be above 84.2°F (29°C), the unit logic will close the factory-supplied dry contacts that will allow the voltage provided to terminal CM1 to be output to terminal CTF. wired to the Normally Closed set of alarm contacts. If no method of pump safety interlock is available at all and/or the safety interlocks are to be jumped, it is highly recommended that the optional FS2 flow switch be installed in the cooling water circuit.
The rocker switch on the front of the Control Panel must be set to “REMOTE” in order for the unit to be controlled by the BMS in this manner. The LON Adapter installation and wiring instructions are included with the accessory package. The LON Adapter is a fieldinstalled option, though it could be factoryinstalled on the WFC-SC50 if ordered as such. It is recommended that field-supplied SPDT relays be used to prevent conflicting signals.
WATER QUALITY Water used in the chilled water, cooling water, and heat medium circuits may cause scaling and/or corrosion if not correctly maintained within specific limits. In some areas, the water supply may contain minerals that cause scaling or may be extremely soft and corrosive. Where these CHILLED WATER 6.8 - 8.0 COOLING WATER HEAT MEDIUM 6.5 - 8.2 7.0 – 8.0 MAKE-UP WATER 6.8 - 8.
INSTALLATION CHECK & REQUEST FOR STARTUP After the absorption chiller has been installed, piped, and wired as described in these instructions, but before any attempt is made to start the unit, the Yazaki Authorized Service Provider (ASP) should be advised so that the startup can be scheduled. The contractor is expected to provide personnel to assist the ASP with final adjustments to the system controls and fluid flow rates as may be necessary.
YAZAKI WFC-SC/SH SERIES CHILLER INSTALLATION CHECK AND REQUEST FOR START-UP Yazaki Authorized Service Provider: Address: Project Name: Project Address: Model No: Serial No: Anticipated Startup Date: A. CHILLER-HEATER 1. Unit placed properly on foundation □ 2. Unit leveled properly □ 3. Service clearance provided on all sides and top (40 in. front) □ 4. Chilled water flow switch piping connected □ C. POWER WIRING 1. Power supply, as indicated on the UNIT NAMEPLATE, is connected □ 2.
YAZAKI AUTHORIZED SERVICE PROVIDER For information concerning service, operation or technical assistance, please contact your Yazaki Authorized Service Provider or the following: YAZAKI ENERGY SYSTEMS, INC. 701 E PLANO PKWY, SUITE 305 PLANO, TEXAS 75074-6700 Phone: 469-229-5443 Fax: 469-229-5448 Email: yazaki@yazakienergy.com Web: www.yazakienergy.com LISTED This symbol on the product’s nameplate means it is listed by UNDERWRITERS LABORATORIES, INC.
