WY-14 WY ELECTRICAL WIRING DIAGRAMS WY REFRIGERANT CIRCUIT DIAGRAMS AND THERMAL SENSORS WY SYSTEM DESIGN GUIDE WY-20

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1 WY SERIES R0A Data G CITY MULTI HEAT SOURCE UNITS WY SERIES WY SERIES. SPECIFICATIONS. CAPACITY TABLES WY WY5. Correction by temperature WY5. Correction by total indoor WY9. Correction by refrigerant piping length WY0. Temp. range of running WY. SOUND LEVELS WY. EXTERNAL DIMENSIONS 5. CENTER OF GRAVITY WY WY6 6. ELECTRICAL WIRING DIAGRAMS WY7 7. REFRIGERANT CIRCUIT DIAGRAMS AND THERMAL SENSORS WY8 8. SYSTEM DESIGN GUIDE WY0 Heat pump: PQHYPY(S)GMA HP 0HP HP HP 6HP 8HP 0HP HP HP 6HP 8HP 0HP HP HP 6HP 8HP 0HP HP HP 6HP 8HP 50HP WY Heat pump HEAT SOURCE UNITS R0A WY

2 . SPECIFICATIONS R0A Data G Model Power source Cooling capacity (Nominal) Temp. range of cooling Heating capacity (Nominal ) External finish Power input Current input COP ( / ) Indoor Circulating water Power input Current input COP ( / ) Temp. range of Indoor heating Circulating water Indoor unit Total capacity connectable Model / Quantity Noise level (measured in anechoic room) Diameter of Liquid (High press.) refrigerant pipe Gas (Low press.) kcal / h Btu / h A kcal / h Btu / h A db <A> mm (in.) mm (in.) PQHYP00YGMA PQHYP50YGMA phase wire 80005V 50 / 60Hz. 9,00 76, ,500 85, P0 ~ P50 / ~ 6 / 6 ø9.5 (ø/8 ) Flare ø9.05 (ø/ ) Brazed 5 ~ CWB (59 ~ 75 FWB) 0 ~ 5 C (50 ~ F) 5 ~ 7 CDB (59 ~ 8 FDB) 0 ~ 5 C (50 ~ F) 50 ~ 0% of Heat source unit capacity Acrylic painted steel plate 8.0,00 95, ,00 07, P0 ~ P50 / ~ 6 7 / 7 ø9.5 (ø/8 ) Flare (ø.7 (ø/ ) Flare, total length >= 90m) ø. (ø7/8 ) Brazed External dimension H x W x D Net weight Heat exchanger Compressor Circulating water HIC circuit (HIC: Heat InterChanger) Protection Refrigerant Drawing Standard attachment Optional parts Remark Water volume in coil Water pressure Max. Type Manufacturer Starting method Motor output Case heater Lubricant Water flow rate Pressure drop Operating volume range mm in. kg (lb) l MPa m / h L / min cfm kpa m / h High pressure protection Inverter circuit Compressor Type x Original charge Control External Wiring Refrigerant circle Document Accessory,800 x 990 x /8 x 9 x 5/8 7 (600) Pipeinpipe coil R0A x 7.0 kg (6 lb) Joint : CMYY0SG Header : CMYY0/08/00G LEV and HIC circuit,800 x 990 x /8 x 9 x 5/8 75 (607) Pipeinpipe coil Inverter scroll hermetic comp. Inverter scroll hermetic comp. AC&R Works, MITSUBISHI ELECTRIC CORPORATION Inverter x (0V) 0.05 x (0V) MEL MEL Pipeinpipe structutre High pressure sensor, High pressure switch.5 MPa (60 psi) Overcurrent protection, Thermal protection Overcurrent protection, Overheat protection R0A x 9.5 kg ( lb) OUW665 OUW76 RC_WYNA Installation Manual Details refer to External Drw. YGMCM0EUC_P8(W665) Joint : CMYY0S/LG Header : CMYY0/08/00G a. The ambient temperature of the Heat Source Unit PQHYPYGMA needs to be kept below 0 CDB. b. The ambient relative humidity of the Heat Source Unit PQHYPYGMA needs to be kept below 80%. c. The Heat Source Unit PQHYPYGMA should not be installed at outdoor. d. Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to the Installation Manual. Note : Nominal cooling conditions Indoor : 7 CDB/9 CWB (8 FDB/66 FWB) Water temperature: 0 C (86 F) Pipe length : 7.5 m (9/6 ft) Level difference : 0 m (0 ft) Nominal heating conditions 0 CDB (68 FDB) 0 C (68 F) 7.5 m (9/6 ft) 0 m (0 ft) * Nominal conditions, are subject to JIS B865. * Due to continuing improvement, above specifications may be subject to change without notice. HEAT SOURCE UNITS Unit converter kcal/h = x 860 Btu/h = x, cfm = m /min x 5. lb = kg / 0.56 *Above specification data is subject to rounding variation. Ref. : Spec_wy_p00_50ygm R0A WY

3 . SPECIFICATIONS R0A Data G Model (Set name) Power source Cooling capacity (Nominal) Temp. range of cooling Heating capacity (Nominal ) Power input Current input COP ( / ) Indoor Circulating water kcal / h Btu / h A kcal / h Btu / h A PQHYP00YSGMA phase wire 80005V 50 / 60Hz 5.0 8,700 5, ~ CWB (59 ~ 75 FWB) 0 ~ 5 C (50 ~ F) 50.0,000 70, Power input Current input COP ( / ).5 Temp. range of heating Indoor Circulating water 5 ~ 7 CDB (59 ~ 8 FDB) 0 ~ 5 C (50 ~ F) Indoor unit connectable Total capacity Model / Quantity 50 ~ 0% of Heat source unit capacity P0 ~ P50 / ~ Noise level (measured in anechoic room) db <A> 50 / 50 Diameter of refrigerant pipe Liquid (High press.) mm (in.) ø.7 (ø/ ) Flare Gas (Low press.) mm (in.) ø8.58 (ø/8 ) Brazed The Set model is a combination of Compressor unit and Sub unit as follows. Model (Compressor unit and Sub unit ) External finish PQYP0YGMA (Compressor unit) Acrylic painted steel plate PQHYP00YGMA (Sub unit) External dimension H x W x D Net weight Heat exchanger Compressor Circulating water Remark Water volume in coil Water pressure Max. Type Manufacturer Starting method Motor output Case heater Lubricant Water flow rate Pressure drop Operating volume range mm in. kg (lb) l MPa m / h L / min cfm kpa m / h HIC circuit (HIC: Heat InterChanger) Protection High pressure protection Inverter circuit Compressor Refrigerant Type x Original charge Control Refrigerant piping diameter (between comp. & sub) Drawing External Wiring Refrigerant circle Standard Document attachment Accessory Optional parts,800 x 990 x /8 x 9 x 5/8 08 (59) Inverter scroll hermetic comp. AC&R Works, MITSUBISHI ELECTRIC CORPORATION Inverter x (0V) MEL Pipeinpipe coil Pipeinpipe structure High pressure sensor, High pressure switch.5 MPa (60 psi) Overcurrent protection, Thermal protection Overcurrent protection, Overheat protection R0A x 7.0 kg (6 lb) R0A x 9.5 kg ( lb) LEV and HIC circuit ø9.5 (ø/8") Flare / ø9.05 (ø/") Flare / ø8.58 (ø/8") Brazed OUW667 OUW76 RC_WYNA Installation Manual Details refer to External Drw. YSGMCM0EUC_P9(W66 Joint : CMYY0S/LG Header : CMYY0/08/00G,800 x 990 x /8 x 9 x 5/8 (58) a. The ambient temperature of the Heat Source Unit PQHYPYSGMA needs to be kept below 0 CDB. b. The ambient relative humidity of the Heat Source Unit PQHYPYSGMA needs to be kept below 80%. c. The Heat Source Unit PQHYPYSGMA should not be installed at outdoor. d. Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to the Installation Manual. Note : Nominal cooling conditions Indoor : 7 CDB/9 CWB (8 FDB/66 FWB) Water temperature: 0 C (86 F) Pipe length : 7.5 m (9/6 ft) Level difference : 0 m (0 ft) Nominal heating conditions 0 CDB (68 FDB) 0 C (68 F) 7.5 m (9/6 ft) 0 m (0 ft) * Nominal conditions, are subject to JIS B865. * Due to continuing improvement, above specifications may be subject to change without notice. HEAT SOURCE UNITS Unit converter kcal/h = x 860 Btu/h = x, cfm = m /min x 5. lb = kg / 0.56 *Above specification data is subject to rounding variation. Ref. : Spec_wy_p00ysgm R0A WY

4 . SPECIFICATIONS R0A Data G Model (Set name) Power source Cooling capacity (Nominal) Temp. range of cooling Heating capacity (Nominal ) Power input Current input COP ( / ) Indoor Circulating water kcal / h Btu / h A kcal / h Btu / h A PQHYP500YSGMA phase wire 80005V 50 / 60Hz ,00 9, ~ CWB (59 ~ 75 FWB) 0 ~ 5 C (50 ~ F) 6.0 5,00 5, Power input Current input COP ( / ).6 Temp. range of heating Indoor Circulating water 5 ~ 7 CDB (59 ~ 8 FDB) 0 ~ 5 C (50 ~ F) Indoor unit connectable Total capacity Model / Quantity 50 ~ 0% of Heat source unit capacity P0 ~ P50 / ~ Noise level (measured in anechoic room) db <A> 5 / 5 Diameter of refrigerant pipe Liquid (High press.) mm (in.) ø5.88 (ø5/8 ) Flare ø8.58 (ø/8 ) Brazed Gas (Low press.) mm (in.) The Set model is a combination of Compressor unit and Sub unit as follows. Model (Compressor unit and Sub unit ) External finish PQYP0YGMA (Compressor unit) Acrylic painted steel plate PQHYP500YGMA (Sub unit) External dimension H x W x D Net weight Heat exchanger Compressor Circulating water Remark Water volume in coil Water pressure Max. Type Manufacturer Starting method Motor output Case heater Lubricant Water flow rate Pressure drop Operating volume range mm in. kg (lb) l MPa m / h L / min cfm kpa m / h HIC circuit (HIC: Heat InterChanger) Protection High pressure protection Inverter circuit Compressor Refrigerant Type x Original charge Control Refrigerant piping diameter (between comp. & sub) Drawing External Wiring Refrigerant circle Standard Document attachment Accessory Optional parts,800 x 990 x /8 x 9 x 5/8 08 (59) Inverter scroll hermetic comp. AC&R Works, MITSUBISHI ELECTRIC CORPORATION Inverter x (0V) MEL Pipeinpipe coil Pipeinpipe structure High pressure sensor, High pressure switch.5 MPa (60 psi) Overcurrent protection, Thermal protection Overcurrent protection, Overheat protection R0A x 7.0 kg (6 lb) R0A x 9.5 kg ( lb) LEV and HIC circuit ø9.5 (ø/8") Flare / ø9.05 (ø/") Flare / ø8.58 (ø/8") Brazed OUW667 OUW76 RC_WYNA Installation Manual Details refer to External Drw. YSGMCM0EUC_P9(W66 Joint : CMYY0S/LG Header : CMYY0/08/00G,800 x 990 x /8 x 9 x 5/8 8 (57) a. The ambient temperature of the Heat Source Unit PQHYPYSGMA needs to be kept below 0 CDB. b. The ambient relative humidity of the Heat Source Unit PQHYPYSGMA needs to be kept below 80%. c. The Heat Source Unit PQHYPYSGMA should not be installed at outdoor. d. Details on foundation work, duct work, insulation work, electrical wiring, power source switch, and other items shall be referred to the Installation Manual. Note : Nominal cooling conditions Indoor : 7 CDB/9 CWB (8 FDB/66 FWB) Water temperature: 0 C (86 F) Pipe length : 7.5 m (9/6 ft) Level difference : 0 m (0 ft) Nominal heating conditions 0 CDB (68 FDB) 0 C (68 F) 7.5 m (9/6 ft) 0 m (0 ft) * Nominal conditions, are subject to JIS B865. * Due to continuing improvement, above specifications may be subject to change without notice. HEAT SOURCE UNITS Unit converter kcal/h = x 860 Btu/h = x, cfm = m /min x 5. lb = kg / 0.56 *Above specification data is subject to rounding variation. Ref. : Spec_wy_p500ysgm R0A WY

5 . CAPACITY TABLES. Correction by temperature R0A Data G CITY MULTI TM could have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. PQHY Nominal Cooling kcal/h Btu/h P00YGM. 9,00 76, Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_C Watervolume [m /h] Waterpressure drop Ref.:WYNB00_C..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CWB] Ref.:WYNB00_C Watervolume [m /h] Ref.:WYNB00_5 PQHY Nominal Heating kcal/h Btu/h P00YGM 5.0,500 85, Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_H Watervolume [m /h] Waterpressure drop Ref.:WYNB00_H..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CDB] 7 Ref.:WYNB00_H Watervolume [m /h] Ref.:WYNB00_5 HEAT SOURCE UNITS R0A WY 5

6 . CAPACITY TABLES. Correction by temperature R0A Data G CITY MULTI TM could have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. PQHY Nominal Cooling kcal/h Btu/h P50YGM 8.0,00 95, Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_C Watervolume [m /h] Waterpressure drop Ref.:WYNB00_C..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CWB] PQHY Nominal Heating kcal/h Btu/h P50YGM.5 7,00 07, Ref.:WYNB00_C Watervolume [m /h] Ref.:WYNB00_5. Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_H Watervolume [m /h] Waterpressure drop Ref.:WYNB00_H..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CDB] 7 Ref.:WYNB00_H Watervolume [m /h] Ref.:WYNB00_5 HEAT SOURCE UNITS R0A WY 6

7 . CAPACITY TABLES. Correction by temperature R0A Data G CITY MULTI TM could have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. PQHY Nominal Cooling kcal/h Btu/h P00YSGM 5.0 8,700 5, Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_C Watervolume [m /h] Waterpressure drop Ref.:WYNB005_C..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CWB] PQHY Nominal Heating kcal/h Btu/h P00YSGM 50.0,000 70,600.0 Ref.:WYNB00_C Watervolume [m /h] Ref.:WYNB005_5. Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_H Watervolume [m /h] 0 Waterpressure drop Ref.:WYNB005_H..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CDB] Ref.:WYNB00_H Watervolume [m /h] Ref.:WYNB005_5 HEAT SOURCE UNITS R0A WY 7

8 . CAPACITY TABLES. Correction by temperature R0A Data G CITY MULTI TM could have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. PQHY Nominal Cooling kcal/h Btu/h P500YSGM ,00 9, Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_C Watervolume [m /h] Waterpressure drop Ref.:WYNB006_C..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CWB] PQHY Nominal Heating kcal/h Btu/h P500YSGM 6.0 5,00 5, Ref.:WYNB00_C Watervolume [m /h] Ref.:WYNB006_5. Inletwater temp.. Water volume Inletwater temp. [ C]. Intake air temp. Ref.:WYNB00_H Watervolume [m /h] 0 Waterpressure drop Ref.:WYNB006_H..0 Waterpressure drop [kpa] Intake air temp. (Room temp.) [ CDB] 7 Ref.:WYNB00_H Watervolume [m /h] Ref.:WYNB006_5 HEAT SOURCE UNITS R0A WY 8

9 . CAPACITY TABLES. Correction by total indoor R0A Data G CITY MULTI TM system has different capacity and input at different total capacity of indoor unit connected. Using following tables, the maximum capacity can be observed so as to ensure the system having enough capacity. PQHYP00,50YGM () () 5.0 P00 P50 Cooling Cooling Heating Heating Total capacity of indoor units PQHYP00,500YSGM Ref: WYNB0, () () P00 P500 Cooling Cooling Heating Heating Total capacity of indoor units Ref: WYNB06,7 HEAT SOURCE UNITS R0A WY 9

10 . CAPACITY TABLES. Correction by refrigerant piping length a. Cooling capacity correction R0A Data G CITY MULTI TM system can extend the piping flexibly within its limitation for the actual situation. Yet, a decrease of cooling/heating capacity could happen correspondently. Using following correction factor according to the equivalent length of the piping shown at.a and.b, the capacity can be observed..c shows how to obtain the equivalent length of piping. PQHYP00YGM PQHYP00YSGM Cooling capacity correction factor Piping equivalent length (m) Ref.: WYNB00_C PQHYP50YGM Cooling capacity correction factor Total capacity of indoor unit Total capacity of indoor unit Piping equivalent length (m) Ref.: WYNB00_C Cooling capacity correction factor Piping equivalent length (m) Ref.: WYNB005_C PQHYP500YSGM Cooling capacity correction factor Total capacity of indoor unit Total capacity of indoor unit Piping equivalent length (m) Ref.: WYNB006_C HEAT SOURCE UNITS R0A WY 0

11 . CAPACITY TABLES. Correction by refrigerant piping length R0A Data G CITY MULTI TM system can extend the piping flexibly within its limitation for the actual situation. Yet, a decrease of cooling/heating capacity could happen correspondently. Using following correction factor according to the equivalent length of the piping shown at.a and.b, the capacity can be observed..c shows how to obtain the equivalent length of piping. b. Heating capacity correction PQHYP00,50YGM, PQHYP00,500YSGM.00 Heating capacity correction factor Piping equivalent length (m) Ref.: WYNB00_H c. How to obtain the equivalent length of piping PQHY, PQRYP00YGM Equivalent length = (Actual piping length to the farthest indoor unit) + (0.5 x number of bent on the piping) m PQHY, PQRYP50YGM Equivalent length = (Actual piping length to the farthest indoor unit) + (0. x number of bent on the piping) m PQHY, PQRYP00YSGM Equivalent length = (Actual piping length to the farthest indoor unit) + (0.50 x number of bent on the piping) m PQHY, PQRYP500YSGM Equivalent length = (Actual piping length to the farthest indoor unit) + (0.50 x number of bent on the piping) m HEAT SOURCE UNITS R0A WY

12 . CAPACITY TABLES. Temp. range of running R0A Data G Cooling FWB CWB 86 0 Indoor temperature Circulating water temperature C F Heating FDB CDB 86 0 Indoor temperature Circulating water temperature C F Ref.: trygmw HEAT SOURCE UNITS R0A WY

13 . SOUND LEVELS R0A Data G Measurement condition PQHYP00,50YGM PQHYP00,500YSGM m Measurement location m Sound level of PQHYP00YSGMA Octave band sound level (db) Approximate minimum audible limit on continuous noise Standard Ref. : PQHYP00YSGMWYNB05 NC0 Overall K K K 8K Octave band central frequency (Hz) NC70 NC60 NC50 NC0 NC0 NC0 6Hz 5Hz 50Hz 500Hz 000Hz 000Hz 000Hz 8000Hz db(a) Standard 50Hz Hz Night mode 50/60Hz * When Night Mode is set, the A/C system's capacity is limited. The system could return to normal operation from Night Mode automatically in the case that the operation condition is severe. Sound level of PQHYP00YGMA Octave band sound level (db) Approximate minimum audible limit on continuous noise Standard Ref. : PQHYP00YGMWYNB057 NC0 Overall K K K 8K Octave band central frequency (Hz) NC70 NC60 NC50 NC0 NC0 NC0 6Hz 5Hz 50Hz 500Hz 000Hz 000Hz 000Hz 8000Hz db(a) Standard 50Hz Hz Night mode 50/60Hz * When Night Mode is set, the A/C system's capacity is limited. The system could return to normal operation from Night Mode automatically in the case that the operation condition is severe. Sound level of PQHYP500YSGMA Octave band sound level (db) Approximate minimum audible limit on continuous noise Standard Ref. : PQHYP500YSGMWYNB05 NC0 Overall K K K 8K Octave band central frequency (Hz) NC70 NC60 NC50 NC0 NC0 NC0 6Hz 5Hz 50Hz 500Hz 000Hz 000Hz 000Hz 8000Hz db(a) Standard 50Hz Hz Night mode 50/60Hz * When Night Mode is set, the A/C system's capacity is limited. The system could return to normal operation from Night Mode automatically in the case that the operation condition is severe. Sound level of PQHYP50YGMA Octave band sound level (db) Approximate minimum audible limit on continuous noise Standard Ref. : PQHYP50YGMWYNB058 NC0 Overall K K K 8K Octave band central frequency (Hz) NC70 NC60 NC50 NC0 NC0 NC0 6Hz 5Hz 50Hz 500Hz 000Hz 000Hz 000Hz 8000Hz db(a) Standard 50Hz Hz Night mode 50/60Hz * When Night Mode is set, the A/C system's capacity is limited. The system could return to normal operation from Night Mode automatically in the case that the operation condition is severe. HEAT SOURCE UNITS R0A WY

14 . EXTERNAL DIMENSIONS R0A Data G PQHYP00,50YGMA Drw. : OUW665 Unit : mm ø8 Knockout hole <Hole for the power supply> ø6 Knockout hole <piping hole> ø8 Knockout hole <piping hole> ø0 <piping hole> ø7 Knockout hole <Hole for the control wiring> ø70<piping hole> ø8 Knockout hole <Hole for the power supply> ø7 Knockout hole <Hole for the control wiring> XX0 Oval hole (mounting hole) ø7 Knockout hole <Hole for the control wiring> ø8 Knockout hole <Hole for the power supply> B 95 A (800) (mounting pitch) (mounting pitch) Note Water inlet (PT / screw) 60 Water outlet (PT / screw) Water inlet (PT / screw) Note Plane view Water outlet (PT / screw) Conn. pipe<liquid> 00:ø9.5<flare> 50:ø9.5<flare> Conn. pipe<gas> 00:ø9.05<brazed> 50:ø.<brazed> Refrig. service valve<gas> Refrig. service valve<liquid> Piping space (left side pipe) Piping space (left side pipe) Knockout hole Drain Note (PT screw) Drain(PT screw) 00 Plane view Service space (front side) Front view Fig. A Piping space (upside pipe) [Accessories] Refrigerant (gas) conn. pipe... pc. (Already installed on the unit) Packing for conn. pipe... pc. (Attached near the ball valve) Bushing... pcs. Model A B P P Left side view Front view Right side view Rear view Note. Close a hole of the water piping, the refrigerant piping, the power supply, and the control wiring and unused knockout holes with the putty etc. so as not to infiltrate rain water etc. (field erection work).. At the time of product shipment, the front side piping specification serves as the local drainage connection. When connecting on the rear side, please remove the rear side plug sealing corks, and attach a front side. Ensure there is no leak after the attachment has been fitted.. Take notice of service space as Fig. A. (In case of single installation, 600mm or more of back space as front space makes easier access when servicing the unit from rear side.). In case the temperature around the Heat source unit has possibility to drop under 0 C, be careful for the following point to prevent the pipe burst by the water pipe freezeup. Circulate the water all the time even if the Heat source unit is not in operation. Drain the water from inside of the Heat source unit when the Heat source unit will not operate for a long term. HEAT SOURCE UNITS R0A WY

15 . EXTERNAL DIMENSIONS PQHYP00,500YSGMA R0A Data G Drw. : OUW667 Unit : mm 600 XX0 Oval hole (mounting hole) (mounting pitch) 0 XX0 Oval hole (mounting hole) ø70<piping hole> A 585 (800) (mounting pitch) Water inlet (PT screw) (mounting pitch) Water outlet (PT screw) 5 Piping space (left side pipe) Plane view Service space (front side) Piping space (upside pipe) ø56 <piping hole> ø8 Knockout hole <Hole for the power supply> ø7 Knockout hole <Hole for the control wiring> Front view Piping space (left side pipe) Fig. A Water outlet (PT screw) Water inlet (PT screw) Knockout hole <piping hole> Left side view [Accessories] Refrigerant (gas) conn. pipe... (Already installed on the unit) Refrigerant (liquid) conn. pipe... (P00 Only : Packaged in the accessory kit) Refrigerant conn. pipe between Heat exchanger unit and Compressor unit ø (Packaged in the accessory kit) ø (Packaged in the accessory kit) ø (Already installed on the unit) Packing for conn. pipe... (Attached near the ball valve) Bushing... External heater adapter... pc. pc. pcs. pcs. pcs. pcs. pcs. set Plane view Heat exchanger unit Conn. pipe<gas> P00:ø8.58<brazed> P500:ø8.58<brazed> Conn. pipe<liquid> P00:ø.7<braze+flare> P500:ø5.88<braze+flare> Refrig. service valve <liquid> Compressor unit Knockout hole ø7 Knockout hole <Hole for the control wiring> Refrig. service valve<gas> Drain (PT screw) ø8 Knockout hole <Hole for the power supply> Model A Connecting pipes are not provided with the 500 models. Drain (PT screw) Field piping ø9.5 <braze+flare> ø9.05 <braze+flare> ø8.58 <brazed> Front view Right side view Conn. wire between Heat exchanger unit and Compressor unit (External heater adapter) Control signal wire <connector, field connected> Note. Close a hole of the water piping, the refrigerant piping, the power supply, and the control wiring and unused knockout holes with the putty etc. so as not to infiltrate rain water etc. (field erection work).. At the time of product shipment, the front side piping specification serves as the local drainage connection. When connecting on the rear side, please remove the rear side plug sealing corks, and attach a front side. Ensure there is no leak after the attachment has been fitted.. Take notice of service space as Fig. A. (In case of single installation, 600mm or more of back space as front space makes easier access when servicing the unit from rear side.). In case the temperature around the Heat source unit has possibility to drop under 0 C, be careful for the following point to prevent the pipe burst by the water pipe freezeup. Circulate the water all the time even if the Heat source unit is not in operation. Drain the water from inside of the Heat source unit when the Heat source unit will not operate for a long term 5. Use the external heater adapter for water Heat source (option) to take length (more than m) between Heat exchanger unit and Compressor unit. HEAT SOURCE UNITS R0A WY 5

16 5.CENTER OF GRAVITY R0A Data G PQHYP00, P50YGMA PQYP0YGMA PQHYP00, P500YGMA Z Model X Y Z PQHYP00YGMA PQHYP50YGMA PQYP0YGMA PQHYP00YGMA PQHYP500YGMA X Y Ref. : PQHY_YGMA_COG_EUDB_ALL HEAT SOURCE UNITS R0A WY 6

17 6. ELECTRICAL WIRING DIAGRAMS R0A Data G 5 CN0B CN0B 5 TH8, 5 TH 6LS 6HS CN0B CN0B CN0A CN0A R R Compressor ON/OFF CNTYP CN06 CN0 CN09 CN0 CNL CNH CNTYP CNTYP5 CNLVC CNLVB NIGHT MODE or STEP DEMAND red yellow green black yellow red CND ) CNN blue Auto change over HEAT COOL SW5 SW SW SW SW Maintenance setting Function setting ~ red ~ + DCL C + ~ CN8 CN0A CN0B 9 SV 7a SV 7b 0 0 SV 7c <Symbol explanation> 5 Symbol Name ACCT AC Current Sensor DCCT DC Current Sensor DCL DC reactor (Power factor improvement) 5C Magnetic contactor (Inverter main circuit) MF CH Sa SV SVa,b,c,d SV5a,b SV7a,b,c LEV Electronic expansion valve (Subcool coil bypass) LEV Electronic expansion valve (Heat exchanger for inverter) TH TH5 TH6 TH7 TH8 TH9 THINV THHS 6H 6HS 6LS L,L Z0 Fan motor (Radiator panel) Case heater (Compressor) way valve Solenoid valve (Dischargesuction bypass) Solenoid valve (Heat exchanger capacity control) Solenoid valve (Heat exchanger capacity control) Solenoid valve (Heat exchanger capacity control) Thermistor Discharge pipe temp. detect Pipe temp.detect Water temp.detect Liquid outlet temp.detect at subcoolcoil Bypass outlet temp.detect at subcoolcoil Freeze prevention sensor Outlet temp.detect of heat exchanger for inverter. Radiator panel temp. detect High pressure switch High pressure sensor Low pressure sensor Choke coil(transmission) Function device Earth terminal <Difference of appliance> :exist X:not exist Model name PQRYP00/P50YGMA PQRYP00/P500YSGMA PQHYP00/P50YGMA PQHYP00/P500YSGMA.Function according to switch operation. (SW7:CND P,and CND P, SW:CN5 5P) SW7:OFF (Compressor ON/OFF and NIGHT MODE) CND P Compressor ON/OFF CND P NIGHT MODE OPEN ON OPEN OFF SHORT OFF SHORT ON SW7:ON (STEP DEMAND) CND P CND P OPEN OPEN 00% SHORT 75% SHORT 0% 50% SW CN5 5P ON water freeze signal OFF trouble signal.auto change over(cnn P,P):PQHY only CNN P CNN P OPEN SHORT OPEN Auto change over:off SHORT Auto change over:on COOL HEAT 5 is on the Heat exchanger unit side for P00/500 type. NOTE:The broken lines indicate field wiring red white black black white red SV b SV a L L L PE TH9 TH7 TH6 TH5 THINV LEV Sub box detection circuit detection circuit X5 CN0A CN0A detection circuit X 0 Control circuit board OFF ON OFF ON OFF ON OFF ON OFF ON 0 LD SWU SWU SWU Address setting Refer to the service handbook about the switch operations. LD CN6PW blue CNPW blue X X X L L L L L L CN8 TB8 (Terminal Block) 6PW Unit ON/OFF Pump interlock N N N white white blue red 6H SV SV c SV d SV 5b S a SV 5a CH CENTRAL CONTROL TRANSMISSION LINE INDOOR/OUTDOOR TRANSMISSION LINE Power source N ~ 80/00/5V 50/60Hz Z0 LEV 5C CN5C yellow X5 CN8 green CN5 red CN6 CN red CN CN X09 X08 X07 X06 X05 X0 X0 X0 X0 V CNOUT yellow CNAC black CN5 Compressor ON/OFF Water freeze signal or trouble signal CNOUT yellow CNAC RELAYBOARD detection circuit CNRSB F0 50VAC 6.A T CN blue 5 F0 50VAC 6.A T CN0 CNS blue CNS blue CNVCC CNOUT green FILTER BOARD CNIN blue TB7 (Terminal Block) CNFG blue CNL CNL shield M M L L TB (Terminal Block) M M shield TB (Terminal Block) red white black blue ACNF (Noise Filter) red white black blue DS (Diode stack) black ZNR C5 R R 5C C R R DCCT red black C P N ACCTU CNDC ACCT IPM red U V W ACCT W white black CNDC black CNDR CNCT blue CNDC black CNDR F0 700VDC A T 8 CNVCC ON OFF Power circuit board LED operation LED error 6 SW ON OFF SW CNRS 7 CNFG blue Gate amp board CN5V CN5V CNAC 5 Function setting F0 50VAC A T CNCT X0 CNTH green CNFAN red MF THHS MC W Motor (Compressor) S E U V PQHYP00,50YGMA,P00,500YSGMA Drw. : OUW76 Inverter controller box HEAT SOURCE UNITS R0A WY 7

18 7. REFRIGERANT CIRCUIT DIAGRAMS AND THERMAL SENSORS R0A Data G PQHYP00,50YGMA Drw. : RC_WYNA way valve High pressure switch CJ TH Oil separator Compressor ST5 High pressure sensor CP ST6 SV SV7c Accumulator ST ST0 THINV LEV Air heat exchanger ST Solenoid Valves Block SVa SVb SVc CJ 6LS 0HP only Water heat exchanger (Double coil type) Water circulating TH9 ST ST5 ST6 CV8a CV9a CV0a Check Valves Block Y SVd CV SV7b TH6 SV7a CV7a CVa CV6a Orifice TH8 CVa TH5 LEV ST8 ST BV TH7 ST BV HEAT SOURCE UNITS R0A WY 8

19 7. REFRIGERANT CIRCUIT DIAGRAMS AND THERMAL SENSORS R0A Data G PQHYP00,500YSGMA Drw. : RC_WYNA CJ High pressure switch TH Oil separator Compressor High pressure sensor CP ST6 SV Compressor Unit Sub Unit (Heat exchanger) BV way valve Solenoid Valves Block CV ST SV7c SVa SVb SVc SVd CV SV7b Solenoid Valves Block TH9 ST LEV ST Accumulator ST0 THINV Air heat exchanger CJ Low pressure sensor ST BV BV5 Water circulating 0HP only ST ST5 ST6 CV8a Water heat exchanger (Double coil type) CV9a CV0a SV7a CVa CV7a CV6a 0HP only CVa ST8 Check Valves Block Y Orifice SV5a SV5b CV7b ST9 CVb CV6b TH8 ST BV TH6 Check Valves Block Y CVb TH7 ST TH5 BV LEV ST8 HEAT SOURCE UNITS R0A WY 9

20 8. SYSTEM DESIGN GUIDE R0A Data G 8. Designing of water circuit system ) Example of basic water circuit The water circuit of the water heat source CITY MULTI connects the heat source unit with the cooling tower/auxiliary heat source/heat storage tank/circulation pump with a single system water piping as shown in the figure below. The selector valve automatically controls to circulate water toward the cooling tower in the cooling season, while toward the heat storage tank in the heating season. If the circulation water temperature is kept in a range of 0~5 C* regardless of the building load, the water heat source CITY MULTI can be operated for either cooling or heating. Therefore in the summer when only cooling load exists, the temperature rise of circulation water will be suppressed by operating the cooling tower. While in the winter when heating load increases, the temperature of circulation water may be dropped below 0 C. Under such situation, the circulation water will be heated with the auxiliary heat source if it drops below a certain temperature. When the thermal balance between cooling and heating operation is in a correct proportion, the operation of the auxiliary heat source and cooling tower is not required. In order to control the above thermal balance properly and use thermal energy effectively, utilizing of heat storage tanks, and nighttime discounted electric power as a auxiliary heat source will be economical. Meantime as this system uses plural sets of heat source unit equipped with water heat exchangers, water quality control is important. Therefore it is recommended to use closed type cooling towers as much as possible to prevent the circulation water from being contaminated. When open type cooling towers are used, it is essential to provide proper maintenance control such as that to install water treatment system to prevent troubles caused by contaminated circulation water. *0~5 C : 50%~0% of indoor units can be connected Example of basic water circuit for water heat source CITY MULTI C.T E.H way valve S.T P T T C.T.P S.T C.T C.T.P P T E.H : Heating tank (Heat storage tank) : Cooling tower : Cooling water pump : Circulation water pump : Thermostat for water : Electric heater : Heat source unit for cooling operation : Heat source unit for heatin operation The indoor unit and refrigerant piping system are excluded in this figure. HEAT SOURCE UNITS R0A WY 0

21 8. SYSTEM DESIGN GUIDE R0A Data G ) Cooling tower a) Types of cooling tower The cooling towers presently used include the open type cooling tower, open type cooling tower + heat exchanger, closed type cooling tower, and aircooled type cooling tower. However, as the quality control of circulation water is essential when units are installed in decentralized state inside a building, the closed type cooling tower is generally employed in such case. Although the circulation water will not be contaminated by atmospheric air, it is recommended to periodically blow water inside the system and replenish fresh water instead. In a district where the coil may be frozen in the winter, it is necessary to apply antifreeze solution to the circulation water, or take freeze protection measures such as to automatically discharge water inside the cooling coil at the stopping of the pump. When the open type cooling tower is used, be sure to install a water quality control device in addition to the freeze protection measures, as the water may be deteriorated by atmospheric contaminants entered into the cooling tower and dissolved into the circulation water. Types of cooling towers Closed type Aircooled type b) Calculation method of cooling tower capacity All units of the water heat source CITY MULTI may possibly be in cooling operation temporarily (at pulling down) in the summer, however, it is not necessary to determine the capacity according to the total cooling capacity of all CITY MULTI units as this system has a wide operating water temperature range (0~5 C). It is determined in accordance with the value obtained by adding the maximum cooling load of an actual building, the input heat equivalent value of all CITY MULTI units, and the cooling load of the circulating pumps. Please check for the values of the cooling water volume and circulation water volume. Cooling tower capacity = Qc x ( Qw + Pw),900 (Refrigeration ton) Qc : Maximum cooling load under actual state (kcal/h) Qw : Total input of water heat source CITY MULTI at simultaneous operation under maximum state () Pw : Shaft power of circulation pumps () HEAT SOURCE UNITS R0A WY

22 8. SYSTEM DESIGN GUIDE ) Auxiliary heat source and heat storage tank When the heating load is larger than the cooling load, the circulation water temperature lowers in accordance with the heat balance of the system. It should be heated by the auxiliary heat source in order to keep the inlet water temperature within the operating range (0 C or more) of the water heat source CITY MULTI. Further in order to operate the water heat source CITY MULTI effectively, it is recommended to utilize the heat storage tank to cover the warming up load in the morning and the insufficient heat amount. Effective heat utilization can be expected to cover insufficient heat at the warming up in the next morning or peak load time by storing heat by installing a heat storage tank or operating a low load auxiliary heat source at the stopping of the water heat source CITY MULTI. As it can also be possible to reduce the running cost through the heat storage by using the discounted nighttime electric power, using both auxiliary heat source and heat storage tank together is recommended. R0A Data G The effective temperature difference of an ordinary heat storage tank shows about 5deg. even with the storing temperature at 5 C. However with the water heat source CITY MULTI, it can be utilized as heating heat source up to 5 C with an effective temperature of a high 0deg. approximately, thus the capacity of the heat storage tank can be minimized. a)auxiliary heat source The following can be used as the auxiliary heat source. Boiler (Heavy oil, kerosine, gas, electricity) Electric heat (Insertion of electric heater into heat storage tank) Outdoor air (Airheat source heat pump chiller) Warm discharge water (Exhaust water heat from machines inside building and hot water supply) Utilization of nighttime lighting Solar heat Please note that the auxiliary heat source should be selected after studying your operating environment and economical feasibility. Determining the auxiliary heat source capacity For the CITY MULTI water heat source system, a heat storage tank is recommended to use. When employment of the heat storage tank is difficult, the warming up operation should be arranged to cover the starting up heating load. Since the holding water inside the piping circuit owns heat capacity and the warming up operation can be assumed for about one hour except that in a cold region, the heat storage tank capacity is required to be that at the maximum daily heating load including the warming up load at the next morning of the holiday. However the auxiliary heat source capacity should be determined by the daily heating load including warming up load on the week day. For the load at the next morning of the holiday, heat storage is required by operating the auxiliary heat source even outside of the ordinary working hour. When heat storage tank is not used QH = HCT ( ) 000 x Vw x ΔT 860 x Pw COPh QH : Auxiliary heat source capacity (kcal/h) HCT : Total heating capacity of each water heat source CITY MULTI (kcal/h) COPH : COP of water heat source CITY MULTI at heating VW : Holding water volume inside piping (m ) ΔT : Allowable water temperature drop = TWH TWL ( C) TWH : Heat source water temperature at high temperature side ( C) TWL : Heat source water temperature at low temperature side ( C) PW : Heat source water pump shaft power () HEAT SOURCE UNITS R0A WY

23 8. SYSTEM DESIGN GUIDE R0A Data G When heat storage tank is used; HQT = ( ) 860 x Pw x T COPh QH = x K (Kcal) T QHT : Total of heating load on weekday including warming up (kcal/day) T : Operating hour of auxiliary heat source (h) T : Operating hour of heat source water pump (h) K : Allowance factor (Heat storage tank, piping loss, etc.).05~.0 HQT is calculated from the result of steady state load calculation similarly by using the equation below. HQT =.5 x ( Q'a + Q'b + Q'c + Q'd + Q'f) T ψ ( Qe + Qe + Qe) (T ) Q'a : Thermal load from external wall/roof in each zone (kcal/h) Q'b : Thermal load from glass window in each zone (kcal/h) Q'c : Thermal load from partition/ceiling/floor in each zone (kcal/h) Q'd : Thermal load by infiltration in each zone (kcal/h) Q'f : Fresh outdoor air load in each zone (kcal/h) Q'e : Thermal load from human body in each zone (kcal/h) Q'e : Thermal load from lighting fixture in each zone (kcal/h) Q'e : Thermal load from equipment in each zone (kcal/h) ψ : Radiation load rate 0.6~ T : Air conditioning hour b) Heat storage tank Heat storage tank can be classified by types into the open type heat storage tank exposed to atmosphere, and the closed type heat storage tank with structure separated from atmosphere. Although the size of the tank and its installation place should be taken into account, the closed type tank is being usually employed by considering corrosion problems. The capacity of heat storage tanks is determined in accordance with the daily maximum heating load that includes warming up load to be applied for the day after the holiday. When auxiliary heat source is operated during operation and even after stopping of water heat source CITY MULTI unit V = HQT ( COPh ) 860 x Pw x T QH x T ΔT x 000 x ηv (ton) When auxiliary heat source is operated after stopping of water heat source CITY MULTI unit V = HQT ( ) 860 x Pw x T COPh ΔT x 000 x ηv (ton) HQT : Maximum heating load including load required for the day after the holiday (kcal/day) ΔT : Temperature difference utilized by heat storage tank (deg) ηv : Heat storage tank efficiency HQT :. x ( Q'a + Q'c + Q'd + Q'f) T ψ( Qe + Qe) (T ) HEAT SOURCE UNITS R0A WY

24 8. SYSTEM DESIGN GUIDE ) Piping system The following items should be kept in your mind in planning / designing water circuits. a) All units should be constituted in a single circuit in principle. b) When plural numbers of the water heat source CITY MULTI unit are installed, the rated circulating water flow rate should be kept by making the piping resistance to each unit almost same value. As an example, the reverse return system as shown below may be employed. c) Depending on the structure of a building, the water circuit may be prefabricated by making the layout uniform. d) When a closed type piping circuit is constructed, install an expansion tank usable commonly for a makeup water R0A Data G tank to absorb the expansion/contraction of water caused by temperature fluctuation. e) If the operating temperature range of circulation water stays within the temperature near the normal temperature (summer : 0 C, winter : 0 C), thermal insulation or antisweating work is not required for the piping inside buildings. In case of the conditions below, however, thermal insulation is required. When well water is used for heat source water. When piped to outdoor or a place where freezing may be caused. When vapor condensation may be generated on piping due to an increase in dry bulb temperature caused by the entry of fresh outdoor air. System example of water circuit Backflow prevention valve Pump Strainer way valve Cooling tower Heating tank Flexible joint way valve Indoor unit Indoor unit Indoor unit Indoor unit Refregerant piping Valve Joint Heat source unit Heat source unit Heat source unit Heat source unit Yshape strainer Drain HEAT SOURCE UNITS R0A WY

25 8. SYSTEM DESIGN GUIDE R0A Data G 5) Cleaning of water heat exchanger For the water heat exchanger, scale adheres in less amount generally in the case of closed type cooling towers. However in a long period of use, scale will adhere that may lower the heat exchange capacity and increase the water resistance. In such case, conduct cleaning work under the procedure given below. The cleaning work procedure generally used is as follows. However as the cleaning agents have various differences in their cleaning effect, corrosion characteristics, processing time, and condensation for use, conduct the work after consulting the relating maker. Acid washing Water washing Neutralization Water washing Applying inhibitor a)still standing method This method feeds the raw liquid or diluted solution of cleaning agent into the water circuit and leave it for a while, and requires only a simple device. Since the cleaning time required differs by the agent of each maker, be sufficiently careful for the time and not to exceed the time specified. Fully recover the cleaning liquid through the water discharge plug of the heat exchanger, and then fully clean the water circuit with clean water. If the water washing can not be made sufficiently, neutralization processing will be effective. Still standing cleaning device Cleaning agent Hose To be closed Tjoint : When no exclusive Tjoint is available, use the connection of the thermometer or the like. Water discharge plug HEAT SOURCE UNITS R0A WY 5

26 8. SYSTEM DESIGN GUIDE b)circulation method Although this method can clean in shorter time than that required by the still standing method, be careful that the circulation pump may be damaged if using cleaning agent with strong corrosive characteristics. After completing washing work, fully recover the washing liquid through the water discharge plug installed at the bottom of the piping and that at the heat exchanger. Conduct water washing for three times or more after removing cleaning agent. If this can not be made satisfactorily, apply neutralization treatment. Full replacement of water can be ascertained by measuring the PH of the water. Note that it may be required to control the cleaning time depending on the scale generation or water quality. At cleaning work, remove or shut down the instruments like water pressure gauges so that the cleaning liquid will not enter into them. R0A Data G Check for the connections of piping beforehand so that cleaning agent will not leak from the piping during cleaning work. Start cleaning operation after fully mixing the cleaning agent with water. Cleaning at the earlier timing is recommended as the removal of scale will be difficult if it has accumulated seriously. Periodical cleaning is necessary in a district with inferior water quality. Conduct water washing sufficiently with clear water after cleaning work as all cleaning agents own strong acidity. To verify the completion of cleaning, remove the hose and observe the inner wall of the piping whether it is clean. Be sufficiently careful for fire when using inflammable cleaning agent (GOSPEL R). Circulation method cleaning device Filtration net Hose Cleaning agent Tank To be closed Hose Tjoint To be closed Tjoint Pump Water discharge plug Water discharge plug Example of cleaning agents Name Shape Condensation Time Makers CLEARLITE RK Powder/Liquid 0~0% ~Hr. Koei Kagaku CLEARLITE ACE Powder/Liquid ~5% ~Hr. Koei Kagaku GOSPEL R GOSPEL SR ADDITION DR SS00 NEOLUX F Liquid Powder Powder Liquid Powder 7% ( ) Upper limit 0%, lower limit 5% ~Hr. Gospel Kako Marusan Seiwa kogyo DISCALER Powder ~7% Saver Kagaku HEAT SOURCE UNITS R0A WY 6

27 8. SYSTEM DESIGN GUIDE 6) Practical System Examples and Circulation Water Control Since the water heat source CITY MULTI is of water heat source system, versatile systems can be constituted by combining it with various heat sources. The practical system examples are given below. Either cooling or heating operation can be performed if the circulation water temperature of the water heat R0A Data G source CITY MULTI stays within a range of 0~5 C. However, the circulation water temperature near C for cooling and 0 C for heating is recommended by taking the life, power consumption and capacity of the air conditioning units into consideration. The detail of the control is also shown below. Example Combination of closed type cooling tower and hot water heat storage tank (using underground hollow slab) Cooling water pump Expansion tank Closed type cooling tower Circulation water pump V XS T Heat source unit T V Heat exchanger EH MG T~T : Thermostat V~V : Proportional type motordriven way valve V : Motordriven way valve XS : Auxiliary switch MG : Magnetic switch EH : Electric heater Heat storage tank pump T V Auxiliary heat source Heat storage tank T By detecting the circulation water temperature of the water heat source CITY MULTI system with T (around C) and T (around 0 C), the temperature will be controlled by opening/closing V in the summer and V in the winter. In the summer, as the circulation water temperature rises exceeding the set temperature of T, the bypass port of V will open to lower the circulation water temperature. While in the winter, as the circulation water temperature drops, V will open following the command of T to rise the circulation water temperature. The water inside the heat storage tank will be heated by the auxiliary heat source by V being opened with timer operation in the nighttime. The electric heater of the auxiliary heat source will be controlled by T and the timer. The start/stop control of the fan and pump of the closed type cooling tower is applied with the step control of the fan and pump following the command of the auxiliary switch XS of V, that operates only the fan at the light load while the fan and pump at the maximum load thus controlling water temperature and saving motor power. HEAT SOURCE UNITS R0A WY 7

28 8. SYSTEM DESIGN GUIDE R0A Data G Example Combination of closed type cooling tower and hot water heat storage tank T : Proportional type, insertion system thermostat T : Proportional type, insertion system thermostat T : Proportional type, insertion system thermostat V : Proportional type, motordriven way valve V : Proportional type, motordriven way valve XS : Auxiliary switch (Duplex switch type) SC : Step controller R : Relay MG : Magnetic Closed type cooling tower SC MG Hot water heat storage tank T CV V XS V Heat source unit R Pump interlock T Heat source water pump In the summer, as the circulation water temperature rises exceeding the set temperature of T, the bypass port of V will open to lower the circulation water temperature. In the winter, if the circulation water temperature stays below 5 C, V will open/close by the command of T to keep the circulation water temperature constant. The temperature of the hot water inside the heat storage tank will be controlled through the step control of the electric heater by step controller operation following the command of T. During the stopping of the heat source water pump, the bypass port of V will be closed fully by interlocking thus preventing the high temperature water from entering into the system at the starting of the pump. The start/stop control of the fan and pump of the closed type cooling tower is applied with the step control of the fan and pump following the command of the auxiliary switch XS of V, that operates only the fan at the light load while the fan and pump at the maximum load thus controlling water temperature and saving motor power. HEAT SOURCE UNITS R0A WY 8