Technical Data
Commercial / Industrial Water Heat Source Eco Cute CO2 Hot Water Supply Heat Pump Unit
MAYEKAWA-HWW-2HTC Ver.1
!
・Before installing the unit, read carefully and understand the contents of this manual. ・Any procedure which disregards the instructions given in this manual could result in a serious accident. Read this manual carefully and have a thorough understanding of all the safety precautions.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. Table of Contents Table of Contents
1. Safety Information ...... - 3 - 2. Warnings ...... - 4 - 3. Specifications ...... - 5 - 3-1. Specifications of the Unit ...... - 5 - 3-2. Range of Use ...... - 5 - 3-3. Water Quality ...... - 6 - 3-4. Performance Chart ...... - 7 - 3-5. Performance Diagrams ...... - 8 - 3-6. Outer Dimensions ...... - 11 - 4. Instructions for Installation ...... - 12 - 4-1. Location of Installation Check Sheet ...... - 12 - 4-2. Base Drawing (Anchor Location) ...... - 14 - 4-3. Soundproof Treatment ...... - 15 - 5. Construction at Job Site ...... - 16 - 5-1. Power, Input / Output Signals ...... - 16 - 5-2. Pump Selection ...... - 18 - 5-3. Installation Procedures ...... - 19 - 5-4. Piping Guidelines ...... - 20 - 6. Operation Instructions ...... - 21 - 6-1. When Starting Up ...... - 21 - 6-2. When Stopping ...... - 22 - 6-3. Alarm Stops and Auto-Stop ...... - 24 - 7. Maintenance ...... - 26 - 7-1. Maintenance of Plate Heat Exchanger ...... - 26 - 7-2. Maintenance Plan ...... - 27 -
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 2 - 1. Safety Information
1. Safety Information
Read this manual carefully and familiarize yourself with the structure, the operating principles and procedures before installing this product. Safety and precautionary warnings provided in this instruction manual are classified into the following categories:
! DANGER:
“DANGER” indicates a hazardous situation in which failure to observe all safety precautions will lead to death or serious injury and or major damage to the system.
WARNING:
!
“WARNING” indicates a hazardous situation in which failure to observe all safety precautions may lead to death or injury and or major damage to the system.
CAUTION:
!
“CAUTION” indicates a hazardous situation in which failure to observe all safety precautions could lead to injury and or damage to the system. “CAUTION” also points out the unsafe practices around the machinery.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 3 - 2. Warnings
2. Warnings
This manual has been prepared in order to assure a safe and effective operation of the system. Keep this manual in a convenient, easily-accessible location near the system and study it frequently.
DANGER
!
・Flammable: When this unit is exposed in a high temperature for a long period of time, the refrigerant gas could relieve, or the container could explode. Keep fire away from the unit. ・Shock Hazard: Do not touch the terminal without shutting down the main switch
and locking it out. Keep water away from the controller and all electrical
equipment. ・Placing a Warning Sign: Place the warming sign where it can be easily seen on the outside of the machine. (Read P.33)
WARNING !
y This manual must be kept in a convenient, easily-accessible location near the system and should be studied periodically by those working with the system. y Any inspection or operation on this product should not be undertaken without a thorough understanding of the instructions given in this manual y Prior to commencing any inspection work on the product, read the safety warnings provided at the beginning of this manual. y Safety and warning labels are attached to the product. Do not remove these labels or allow them to become dirty and unreadable. y If this manual is lost or damaged, a replacement should be obtained immediately from the nearest Mayekawa / Mycom office in your area. y Any questions regarding this manual or the product should be addressed to the nearest Mayekawa / Mycom office in your area. y Do not climb on the product. y The refrigerant could cause frostbite or blindness, when it comes in contact with the skin or the eyes. Handle it with care. y Mayekawa Mfg. Co., Ltd reserves the right to make changes or improvements to its products without notice. It is possible, therefore, that some explanations given in this manual may not apply to a particular machine. If any uncertainty exists on the part of the unit operator, contact Mayekawa Mfg. Co., Ltd. or the nearest Mayekawa / Mycom office in your area.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 4 - 3. Specifications
3. Specifications 3-1. Specifications of the Unit Water Heat Type PG Cooling Cooling Recovery Model HWW-2HTC Type - R-744 (CO2) Refrigerant Fill ration lbs 24.25 Heating Ability kW 50.0 82.0 101.9 Performance Cooling Ability kW 350 61.7 82.3 Power Consumption kW 18.4 21.8 23.1 Power Supply 3ø AC200V 50Hz/60Hz Semi Hermetic 2 Cylinder Reciprocating Model - Compressor MAYEKAWA 2HT Compressor Star-up Method - Inverter (No volume control) Motor Designated kW 25 Output Oil Heater W 100 Model - 3 Cylinders Hot Water Condition °F 63/149 Water Water Amount L/min 15 24 30 Heater Material - Copper Connecting Bore - Rc3/48 (20A) Diameter Model - BRAZED TYPE Plate Heat Exchanger Cool Water Condition °F 23/15.8 53.6/44.6 71.6/62.6 Water Water Amount L/min 125 177 236 Cooler Material - SUS316 Connecting Bore - Rc2B (50A) Diameter Outer Dimensions inch W 44.88 x L 50.90 x H 75.55 Weight lbs Product Weight 2491 (Operating Weight 2520) Refrigerating Ton - 8.3
High pressure, low pressure, oil pressure, Protection equipment: - compressor overload, discharge temperature, differential pressure, freeze-up, water failure
Paint Color - Munsell 5Y 7/1 Noise dB(A) 60
3-2. Range of Use Items Unit Conditions Heat Exchanger - Water Heater Water Cooler Type - - Brine cooling Water Cooling Heat Recovery Liquid Type - Water Brine Brine or Water Brine or Water 11 ~ 88.18 Inlet Temperature °F -11 ~ 81.57 22 ~ 81.57 11 ~ 70.54 (11 ~ 143*2) Outlet (exit) Temperature °F 143 ~ 198 -19.8 ~ 70.5 11 ~ 70.5 11 ~ 70.5 Inlet Water Pressure Psi 21.75 ~ 71.06 (When open) Flow Rate L/min 8 ~ 35 ≥100
Temperature Difference °F ≥ 77 Recommended : 11 between Inlet and Outlet
*1. Read section 3-3 Water Quality for detail. *2. When the water from the outlet is at 194 °F Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 5 - 3. Specifications
3-3. Water Quality
The heat exchanger equipped on this unit has a body that is replaceable; however, its structure does not allow any further disassembly to clean or to replace any other parts.
It is ideal that treated water with a high quality comes in contact with the heat exchanger and the piping equipped on this unit. Using the tap water could shorten the life of the heat exchanger. Using water whose quality is below the standard can lead to scaling or damage on the piping.
When choosing brine for cooling water, there is no limitation on its type or its density as long as the brine is not the type that leads to corrosion of the heat exchanger (Copper SUS316) such as calcium chloride. However, brine can lose its effectiveness when it absorbs the moisture in the air. With the increase of moisture within the brine it can create freeze-ups. Therefore, it is important to keep the area of contact between the brine and the air to a minimum. Check the quality of the brine regularly. Refill the brine as needed in order to maintain the quality.
ater Quality for Refrigerating and Air-Conditioning Values of Standard Water Quality for Cooling Water / Refrigerated Water / Heated Water / Makeu JRA-GL-02-1994 Cooling Water (4) Heated Water (3) Refrigerated Water Tendency (2) Cycle System 一過式 低位 medium temp water高位 medium temp water Items (1) (6) Circulating Circulating Makeup Circulating Makeup rculating WaMakeup Wate 一過水 Makeup Wate Corrosion Scale Water Water [bet. Water Water [bet. Water pH (25 C) 6.5 ~ 8.2 6.0 ~ 8.0 6.8 ~ 8.0 6.8 ~ 8.0 6.8 ~ 8.0 7.0 ~ 8.0 7.0 ~ 8.0 7.0 ~ 8.0 7.0 ~ 8.0 ○○ Electric Conductivity (25 C, mS/ below 80 below 30 below 40 below 40 below 30 below 30 below 30 below 30 below 30 ○○ Chrolide Ion (mgCI/L) below 200 below 50 below 50 below 50 below 50 below 50 below 50 below 30 below 30 ○ Sulphate Ion (mgSO42-/L) below 200 below 50 below 50 below 50 below 50 below 50 below 50 below 30 below 30 ○ Acid Consumption (pH4.8) (mgCbelow 100 below 50 below 50 below 50 below 50 below 50 below 50 below 50 below 50 ○ Calcium Hardness (mgCaCO3/Lbelow 200 below 70 below 70 below 70 below 70 below 70 below 70 below 70 below 70 ○
Standard Items Standard Total Hardness (mgCaCO3/L) below 150 below 50 below 50 below 50 below 50 below 50 below 50 below 50 below 50 ○ Ionic Status Silica (mgSD2/L) below 50 below 30 below 30 below 30 below 30 below 30 below 30 below 30 below 30 ○ Iron (mgFe/L) below 1.0 below 0.3 below 1.0 below 1.0 below 0.3 below 1.0 below 0.3 below 1.0 below 0.3 ○○ Copper (mgCu/L) below 0.3 below 0.1 below 1.0 below 1.0 below 0.1 below 1.0 below 0.1 below 1.0 below 0.1 ○ Sulphade Ion (mgS2-/L) Should NOT be detected ○ Ammonium Ion (mgNH4+/L) below 1.0 below 0.1 below 1.0 below 1.0 below 0.1 below 0.3 below 0.1 below 0.1 below 0.1 ○ Residual Chloride (mgCI/L below 0.3 below 0.3 below 0.3 below 0.3 below 0.3 below 0.25 below 0.3 below 0.1 below 0.3 ○
References* Free Carbon Dioxide (mgCO2/L below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 ○ Stability Index 6.0 ~ 7.0 ------○○
Notes: (1) The standards and units are from JISK0101. (2) ◯suggests that there may be corrosion and scaling. (3) Generally, when the temperature is high (over 40 °C), there tend to be drastic corrosions. When steel is exposed to the water without any protection, use anticorrosive agents and other treatments. (4) The cooling water on the direct vent cooling tower: The circulating water in the closed circuit and the makeup water should be compared to the heated water’s quality standard. Also, the spray water and its makeup water should be compared to the circulating cooling water’s quality standard. (5) The supply and makeup water should not be purified, or water that has been through softening treatment. It should be treated water (tap water), construction water, or underground water. (6) The 5 items listed above are the major factors for corrosion and scaling.
CAUTION
! Accordin g to a schedule check the water quality.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 6 - 3. Specifications
3-4. Performance Chart
149 F Hot water supply temperature Heat Source F Inlet water Temperature Capacity Inlet outlet 50 F 63 F 77 F 86 F 104 397,048 380,320 348,569 330,817 286,093 Heating BTU BTU BTU BTU BTU 98.6 89.6 Cooling 29 TR 27 TR 24 TR 22 TR 18 TR Power 21.6Kw 22.2Kw 24.2Kw 24.5Kw 26.Kw 362,908 347,887 319,209 299,066 255,367 Heating BTU BTU BTU BTU BTU 71.6 62.6 Cooling 25 TR 23 TR 21 TR 19 TR 15 TR Power 22.5Kw 23.1Kw 24.Kw 24.3Kw 25.6Kw 279,948 260,830 245,808 213,034 Heating 295,311 BTU BTU BTU BTU BTU 53.6 44.6 Cooling 19 TR 19 TR 16 TR 14 TR 11 TR Power 21.2Kw 21.8Kw 23.2Kw 23.8Kw 24.4Kw 177,528 170,700 157,385 148,850 134,170 Heating BTU BTU BTU BTU BTU 23 15.8 Cooling 11 TR 10 TR 9 TR 8 TR 1 TR Power 17.3Kw 18.4Kw 18.2Kw 18.8Kw 19.7Kw
194 F Hot water supply temperature Heat Source F Inlet water Temperature Capacity Inlet outlet 50 F 63 F 77 F 86 F 104 371,443 345,497 317,843 243,077 136,560 Heating BTU BTU BTU BTU BTU 98.6 89.6 Cooling 25 TR 23 TR 21 TR 14 TR 5 TR Power 27.3Kw 26.7Kw 26.9Kw 27.1Kw 27.2Kw 340,034 316,136 291,556 220,886 133,829 Heating BTU BTU BTU BTU BTU 71.6 62.6 Cooling 22 TR 20 TR 18 TR 12 TR 4 TR Power 27.Kw 26.4Kw 26.6Kw 27.Kw 27.1Kw 284,386 260,830 245,125 191,184 120,173 Heating BTU BTU BTU BTU BTU 53.6 44.6 Cooling 17 TR 14 TR 14 TR 9 TR 3 TR Power 24.8Kw 24.9Kw 24.9Kw 25.3Kw 25.7Kw 171,383 165,579 130,415 Heating BTU BTU BTU 98,323 BTU 71,011 BTU 23 15.8 Cooling 10 TR 10 TR 6 TR 3 TR 1 TR Power 19.4Kw 19.6Kw 19.Kw 19.6Kw 20.2Kw
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 7 - 3. Specifications
3-5. Performance Diagrams
1. Heating Capacity and the amount of Produced Hot Water
a. Produced Hot Water at 65 °C
b. Produced Hot Water at 90 °C
Operation of the product with the condition beyond the maximum hot water supply value, for a long period of time will damage the equipment.
Set the hot water supply temperature at 90 °C, or use equipment that limits the inlet (heated water inlet) temperature. Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 8 - 3. Specifications
2. Cooling Capacity and the Amount of Produced Chilled Water
a. Produced Hot Water at 65 °C
Heat Source Water Inlet Temperature (°C) For reference only
b. Produced Hot Water at 90° C
Heat Source Water Inlet Temperature (°C) For reference only
The amount of chilled water indicates the amount when the differential temperature between the inlet and the outlet is fixed at 5 °C. Please note that In order to maintain the amount of 100L/min when operating with the condition below the minimum chilled water amount, the differential temperature must be below 5 °C. Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 9 - 3. Specifications
3. Power Consumption
c. Produced Hot Water at 65 °C
Heat Source Water Inlet Temperature (°C) For reference only
d. Produced Hot Water at 90 °C
Heat Source Water Inlet Temperature (°C) For reference only
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 10 - 3. Specifications
3-6. Outer Dimensions
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 11 - 4. Instruction for Installation
4. Instructions for Installation
4-1. Location of Installation Check Sheet
The location of installation should be considered in the designing stage. Use the check list below to see if there is any problem with the planned location.
Items Y/N Notes
The floor can support the weight of Structural reinforcement may be 1 the Eco-Cute in operation. required.
The shape and location of the base is 2 Refer to the base drawing. compatible with Eco-Cute.
The floor requires anti vibration device 3 or flexible joint in order to keep the noise from transmitting.
4 There is enough safety space.
The location is suitable for an install, Secure safety space, aisles, and 5 operation, and daily maintenance. handrails.
Make sure the snow will not cover 6 There is snow protection, if necessary. the fresh air inlet.
Refer to the law related to the noise 7 There are soundproof walls. and put soundproof walls accordingly.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 12 - 4. Instruction for Installation
During the installation, secure a maintenance space for maintenance checks. The recommended maintenance check space is specified in the drawing below. If you cannot secure the recommended space, contact a Mayekawa / Mycom office.
Maintenance Space for 1 Eco-Cute
Space to pull out the heat exchanger
Safety space
Gas cooler
Compressor
Space to pull out the compressor
DANGER !
Secure the escape route and safety space!
Secure a large enough area of space to pull out the compressor. (Minimum 900mm.)
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 13 - 4. Instruction for Installation
4-2. Base Drawing (Anchor Location)
Anchor bolt for M12
The holes on Eco-Cute for the anchor bolts are φ14. Use the chemical anchors for M12 (the depth over 6cm when horizontal seismic coefficient 1.5G).
*1: See the installation drawing for the actual outer dimension. *2: The dimension will change if there are changes made on the product. Make sure to go over the installation drawing. *3: When the location of installation is rather peculiar, consult with a Mayekawa / MYCOM office.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 14 - 4. Instruction for Installation
4-3. Soundproof Treatment
(1) Noise
The noise value of this product is 60dB(A). If the noise from Eco-Cute compromises the living conditions of the neighboring people, you need to provide a sufficient soundproofing plan. In particular, this product is designed to give more benefits by storing the heat during the night when a discount for industrial use of electricity is given (*in Japan). The regulation for the noise during this time period is especially strict. Make sure to provide a sufficient soundproofing plan for this time period as well.
(2) Regulations Related to Noise Control (Japan)
Noise Control Standard
The City by-laws and regulations are required to determine the maximum allowable noise ([Noise Control Standard]) levels of each area, please consult them at time of install.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 15 - 5. Construction at Job Site
5. Construction at Job Site
5-1. Power, Input / Output Signals
The drawing below describes the basic distribution diagram.
ELB 250AF/200AT
Power 3φ 200V 50/60Hz Rated current: 92.7A
Product Supply Range Water Source Eco-Cute
Produced chilled water Chilled Water Pump
Cold supply water Temperature control Two-way valve Produced hot water Supply Water Pump
Water Supply
Output signals to outside Input signals from outside
Outside Main Power Control
Power for Pump
(1) Main Power The power supply is indicated below. Place the circuit breaker in areas required by the law.
Main Power 3φ AC200V 50/60Hz Rated Current 92.7 (A) Cable size for the main power 60sq (below 20M), E8sq Circuit breaker 250AF / 200AT
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 16 - 5. Construction at Job Site
(2) Output Signals to Outside The diagram below describes the output signals from Eco-Cutes.
EcoCute Outer Panel
Chilled water auto-shutoff (7)
Water supply auto-shutoff (6)
Chilled water pump command (5)
Water supply pump command (4)
Unit Damage (3)
Unit Operation (2)
Chilled water auto-shutoff; outputs that signal the chilled water condition is satisfied and shuts off the chilled water. Water supply auto-shutoff outputs that signal the hot water condition is satisfied and shuts off the hot water . Chilled water pump command output signal from Eco-Cute to start the chilled water pump. Water supply pump command outputs signal from Eco-Cute to start the water supply pump. Unit damage outputs to the panel that the unit is damaged and stopped. Unit Operation outputs to the panel to indicate that the unit is in operation.
(3) Input signals from outside The below diagram describes the input signals from the outside to Eco-Cute.
Eco-Cute Outer Panel
Emergency Stop (X6)
Chilled water pump confirmation (X5)
Water supply pump confirmation (X4)
Produced hot water request (X3)
Chilled water request (X2)
Operation Command (X1)
N24
Emergency stop can be used as the outer connection for emergency stops. When the circuit is set to [CLOSE], Eco-Cute will be stopped. Chilled water pump confirmation is an interlock. When the confirmation cannot be made, it will set off the alarm. Water supply pump confirmation is an interlock. When the confirmation cannot be made, it will set off the alarm. Hot water request: When the circuit is set [OPEN], it indicates that the hot water is not required, and therefore the unit will not operate. If the produced hot water is always required, use a bypass. Chilled water request: When the circuit is set [OPEN], it indicates the chilled water is not required, and therefore the unit will not operate. If the chilled water is always required, use a bypass. Operation Command start and stop. [OPEN] indicates operation, and [CLOSE] indicates stop.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 17 - 5. Construction at Job Site
5-2. Pump Selection
The loss of pressures in the unit by the pumps is described below. Take the piping at the job site into consideration when selecting a pump.
(1) Loss in hydraulic head pressure of hot water
35 Produced Hot WaterProduced Hot [L/min] Amount 30 17.8 n] 25 12.9
20 8.7 出湯量 [L /m i
15 5.3
10 0 5 10 15 20 Loss in水頭損失 [m Hydraulic Head ] [m]
(2) Loss in hydraulic head pressure of chilled water
300
250
Chilled Water Amount [L/min] 5.5 4.4 200
n] 3.5
2.8 150 2.0 1.4
冷水量 [L /m100 i 0.9
50
0 0123456 Loss in水頭損失 [m Hydraulic Head ] [m]
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 18 - 5. Construction at Job Site
5-3. Installation Procedures
1. Unloading Use proper equipment to load and unload this product. Keep the weight and dimensions (listed below) in mind. Damage to the Eco Cute at this point will require inspection from a Mayekawa branch closest to you.
Specifications Weight 2491 lbs
Outer Dimensions W44.88 inch x L50.90 inch x H75.55 inch
2. Installation This product can be installed on a rooftop. In that case, a crane will be used to lift it. Plan the installation with extreme care to avoid any physical injury. Make sure to use the proper lifting equipment.
When transferring or lifting the product, keep it level.
Over 60° Over 60°
Anchoring point Gravity point
Left Side Front
! WARNING Do not stand under the product.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 19 - 5. Construction at Job Site
5-4. Piping Guidelines
1. General guide x The piping work and thermal insulation treatment should be done after the installation of the product. x Do not confuse the inlet and the outlet of the hot water with those of the chilled water. x Install a stop valve and an air purging valve as required.
2. Piping for hot water inlet x Use a pipe that allows the flow rate of maximum 35L/min. x On an open system, set the water inlet pressure as 0.15 ~ 0.49MPa. x This construction should be considered a general construction method of inlet piping, with an SUS 604 pipe or a cupper pipe. x In order to keep the pipe surface dry, apply thermal insulation on the surface. x If the operation is stopped during the winter time or the night in locations where the temperature goes down below 0 °C, apply a protection against freeze-ups on the surface.
3. Piping for produced hot water outlet x Use a pipe made of SUS316 (with the temperature limit over 100°C). x Although it depends on the material of the thermal insulation, apply heat insulation work that is between 30 ~ 50mm. x Install a check valve to avoid reverse flow.
4. Piping for chilled water x Make sure to install a 1.5mm strainer to keep foreign substances out. x Install a gate valve in both inlet and outlet pipes. Install a connection port between the gate valve and the unit for chemical cleansers and treatments. x Make sure to use a pipe that can support more than the minimum chilled water flow amount of 100L/min. Also, install a manual control valve. x When it is an open system, set the inlet pressure for chilled water between 0.15 ~ 0.49 MPa. x Although it depends on the material of the thermal insulation, apply heat insulation work that is between 30 ~ 50mm. x Again if the operation is stopped during the winter time or the night in locations where the temperature goes down below 0 °C, apply a protection against freeze-up on the surface. (same has hot water inlet)
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 20 - 6. Operation Instructions
6. Operation Instructions
6-1. When Starting Up
１． Select [Local] or [Remote] on the touch panel. ２． Eco-Cute receives both Hot Water and Chilled Water request signals. The unit will not start up with only 1 signal. (Read P.17.) ３． On [Local] mode, press [ON] on the touch panel. On [Remote] mode, the operation signal is released from a remote site. ４． When the water supply (inlet water) temperature is below 65 °C and when chilled water temperature at the outlet is higher than 4 °C, the water supply two-way valve will open. ５． Eco-Cute receives operation confirmation signals from the water supply pump and chilled water pump (interlock). ６． The flow of heated water and chilled water is confirmed. When the flow is not confirmed in 10 seconds, the water failure alarm or chilled water alarm is set off. Eco-Cute will not start. ７． The compressor starts up at 10 seconds after the pumps start running. Then Eco-Cute will start up.
*Reboot Timer(Reboot prevention timer) A timer to prevent the hunting. Under any condition (both on Local and Remote), the system will not reboot until 3 minutes have passed after the compressor stops.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 21 - 6. Operation Instructions
6-2. When Stopping
Local Stop １． Press [OFF] on the touch panel. (When [Local] is on display.) ２． The compressor will stop. The water supply pump and the chilled water pump will stop 1 minute after the compressor. ３． The water supply two-way valve will close, and the whole operation will stop. ４． The system will not re-start, till the Reboot timer expires.
Remote Stop １． Eco-Cute receives an Operation Stop signal from a remote site, or Eco-Cute requests either [Hot Water] or [Chilled Water]. ２． The compressor will stop. The water supply pump and the chilled water pump will stop 1 minute after the compressor. ３． The water supply two-way valve will close, and the operation will stop.
Auto-Stop due to rising temperature of supplied water １． When the temperature of supply water (inlet water) becomes over 65 °C, the compressor will stop. ２． After 1 minute, the water supply pump and the chilled water pump will stop. ３． The water supply two-way pump will close, and the system will be in auto-stop. ４． The system will recover automatically in 30 minutes.
Auto-Stop due to lowering temperature of chilled water １． When the temperature of chilled water at the inlet becomes below 4 °C, the compressor will stop. ２． After 1 minute, the water supply pump will stop (the chilled water pump will continue working). ３． The water supply two-way valve will close, and the system will be in auto-stop. ４． Until the recovery conditions are satisfied, the system will not signal the operation command to the chilled water pump. The unit will not start during this time. ５． When the recovery conditions are satisfied, the operation command from the system to the Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 22 - 6. Operation Instructions
unit, will signal automatically. Without this operation command, the chilled water pump will not start.
※ If you wish to stop the chilled water pump during an auto-stop, send Stop Command before the pump stops due to lowering temperature of the chilled water.
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 23 - 6. Operation Instructions
6-3. Alarm Stops and Auto-Stop
(1) Alarm Stops There are a few Alarm Stops programmed to protect the system. The Alarm Stops are listed below. After Alarm Stops, the system will start again after the alarm is cancelled (reset) and the operation command is received.
Alarm Names Initial Value Description The Causes
Rising discharge System stop due to abnormal Auto-stop due to the values 15 [MPa] beyond set value is repeated 5 pressure rising in discharge pressure times Lowering suction System stop due to abnormal Auto-stop due to the value below 1.5 [MPa] pressure lowering in suction pressure. set value is repeated 3 times. Lowering differential System stop due to abnormal (Feeding pressure – Suction 0.1 [MPa] lowering in differential feeding pressure) is below the set feeding pressure pressure. value for 60sec. Rising differential System stop due to abnormal rising Auto-stop due to the values 11 [MPa] in differential pressure between beyond set value is repeated pressure discharge and suction pressure 3 times. High pressure System stop or operation denied 1.3 [MPa] due to abnormal lowering in Below the set value sensor error discharge pressure (Lowering suction Operation denied due to abnormal Below the set value for 1.3 [MPa] pressure) Refrigerant leak rising in suction pressure 20 sec. Auto-stop due to the values Rising discharge System stop due to abnormal beyond set value is repeated 150 [ ] rising in discharge temperature temperature 3 times. Compressor System stop due to 114 [A] Beyond the set value overload compressor overload. System stop due to abnormally Motor overheat - high temperature of compressor - motor
System stop due to compressor / pump error, or operation denied Operation jam - due to compressor / pump start - failure
System stop due to abnormal Below the set value for Chilled water failure 100 [L/min] lowering in chilled water flow. 10 sec.
Heated water System stop due to abnormal Below the set value for 7 8 [L/min] failure ～ lowering in hot water flow. 10 sec.
Operation denied due to Damaged pump - damaged pump. -
Operation denied due to break in Damaged SHC - expansion valve or heating - temperature control
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 24 - 6. Operation Instructions
(2) Auto-Stops There are a few Auto-Stops programmed to protect the system. When the conditions are satisfied, the unit will recover automatically. When the number of retry reaches the set value, Alarm Stop will not allow the unit to start. However, when the unit operates continuously for 30 minutes, retry count will be reset. Rising in the water supply (inlet water) temperature and lowering in the chilled water temperature has no set value for retry (no alarm stops programmed).
Initial Retry Auto-Stops Names Auto-Stop Conditions Recovery Conditions Value Allowed Rising in discharge 180 sec after reboot 2175 [Psi] Beyond the set value 5 pressure time sets off Lowering in suction Below the set value for 30 180 sec after reboot 217 [Psi] 3 pressure seconds time sets off
(Discharge pressure – Rising in differential 180 sec after reboot 1595 [Psi] Suction pressure) is below 3 pressure time sets off the set value for 5 sec.
Rising in discharge 180 sec after reboot 302 [F] Beyond the set value 3 temperature time sets off Rising in water Beyond the set value for 10 Inlet temperature supply (inlet water) 149 [F] - seconds. 140 °F for 30mins temperature
Lowering in chilled Below the set value for 30 Chilled water temperature 39.2 [F] at 50 °F, and 180 sec after - water temperature seconds reboot time sets off
Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice. - 25 - 7. Maintenance
7. Maintenance
7-1. Maintenance of Plate Heat Exchanger
（1） Inspection items before season ① Test water quality ② Clean strainer ③ Check flow rate ④ Confirm operating conditions (pressures, flow rates, inlet/outlet temperature, etc.)
（2） Cleaning methods ① Make sure there is a pipe connecting port on the water inlet pipe for treatments. Also, make sure there is a valve in front of inlet connecting port and behind outlet connecting port. ② Connect the pipe to circulate the treatments into the inlet/outlet pipe of the heat exchanger. Fill the heat exchanger with the treatments (at 50 ~ 60 °C), and let it circulate for about 2 ~ 5 hours. The circulating time depends on the temperature of the treatments and the amount of scales. Use the changing color of the treatments to judge the circulation and cleaning time. ③ After finishing the cleaning fill the heat exchanger with a treated water solution of 1~2% sodium hydrate (NaOH) or bicarbonate of soda (NaHCO3) for about 15~20 minutes in order for neutralization. ④ After the neutralization, rinse the inside of the heat exchanger with clean water. ⑤ Confirm that the heat exchanger operates properly after the cleaning.
z Treatments used to clean the scale, formic acid, citric acid, oxalic acid, acetic acid, or phosphoric acid dilute to 5%. Do not use hydrochloric acid, sulfuric acid, and nitric acid, as they are highly corrosive. Before using a cleaning treatment, make sure it is not corrosive to stainless steel and copper. Contact the maker of the treatments for details of proper cleaning methods.
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7-2. Maintenance Plan
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MFG. Co., Ltd.
(2008-10) Ver.1 C600001-0