HITACHI DHWT-200S-3.0H2E Domestic Hot Water Tank Instruction Manual

HITACHI DHWT-200S-3.0H2E Domestic Hot Water Tank

Product Specifications

The specifications mentioned in this manual are subject to change without prior notice to ensure HITACHI can provide the latest innovations to its customers.
While every effort is made to ensure the accuracy of all specifications, printing errors are beyond HITACHI’s control, and thus HITACHI cannot be held responsible for such errors.

General Information
No part of this publication may be reproduced, copied, filed, or transmitted in any shape or form without the permission of Johnson Controls- Hitachi Air Conditioning Spain, S.A.U.
Johnson Controls-Hitachi Air Conditioning Spain, S.A.U. reserves the right to make changes to its products at any time without prior notification as part of its continuous improvement policy. This document may have been subject to amendments during the product’s lifespan.

Safety
Ensure to follow all safety guidelines provided in the manual to prevent any accidents or injuries during installation or usage of the Domestic Hot Water Tank DHWT-(200/300)S-3.0H2E.

Installation
Refer to the installation section of the manual for detailed instructions on how to correctly install the DHWT-(200/300)S-3.0H2E domestic hot water tank.

Basic Troubleshooting
If you encounter any issues with the product, consult the troubleshooting section of the manual for guidance on identifying and resolving common problems.

Dimensional Drawings
Find detailed dimensional drawings in the manual to assist you in understanding the physical dimensions of the DHWT-(200/300)S-3.0H2E hot water tank.

Name of Parts
Learn about the different parts and components of the DHWT-(200/300)S-3.0H2E hot water tank in the designated section of the manual.

Unit Installation
Follow the instructions provided for unit installation to ensure proper setup and functioning of the DHWT-(200/300)S-3.0H2E domestic hot water tank.

Hydraulic Circuit
Understand the hydraulic circuit of the product by referring to the relevant section in the manual which explains how fluids move within the system.

Electrical Wiring
For information on electrical wiring requirements and connections, consult the electrical wiring section of the manual for step-by-step instructions.

Safety Summary & Control Device Setting
Ensure to review the safety summary and control device setting instructions to operate the DHWT-(200/300)S-3.0H2E hot water tank safely and efficiently.

General Standard for Hydraulic Installation
Refer to this section for general standards related to hydraulic installations and best practices to follow when setting up the DHWT-(200/300)S-3.0H2E.

Frequently Asked Questions (FAQ)

• Q: Can I use this hot water tank for commercial purposes?
  A: The DHWT-(200/300)S-3.0H2E is designed for domestic use only and should not be used for commercial applications.

• Q: What is the voltage and frequency requirement for this hot water tank?
  A: The DHWT-200S-3.0H2E operates on 1~ 230V 50Hz power supply, while the DHWT-300S-3.0H2E has similar specifications.

Specifications in this manual are subject to change without notice in order that HITACHI may bring the latest innovations to their customers.
Whilst every effort is made to ensure that all specifications are correct, printing errors are beyond HITACHI’s control; HITACHI cannot be held responsible for these errors.

CAUTION

• This product shall not be mixed with general house waste at the end of its life and it shall be retired according to the appropriated local or national regulations in a environmentally correct way.
• Contact to the corresponding authorities for more information.

Important note : Please, check, according to the model name, which is your air conditioner type, how it is abbreviated and referred to in this Instruction Manual. This Instruction Manual is only related to Domestic hot water tank (DHWT(200/300)S-3.0H2E).

GENERAL INFORMATION

No part of this publication may be reproduced, copied, filed or transmitted in any shape or form without the permission of Johnson Controls-Hitachi Air Conditioning Spain, S.A.U.
Within the policy of continuous improvement of its products, Johnson Controls- Hitachi Air Conditioning Spain, S.A.U. reserves the right to make changes at any time without prior
notification and without being compelled to introducing them into products subsequently sold. This document may therefore have been subject to amendments during the life of the product.
HITACHI makes every effort to offer correct, up-to-date documentation. Despite this, printing errors cannot be controlled by HITACHI and are not its responsibility.
As a result, some of the images or data used to illustrate this document may not refer to specific models. No claims will be accepted based on the data, illustrations and descriptions included in this manual.

SAFETY

APPLIED SYMBOLS
During normal heat pump system design work or unit installation, greater attention must be paid in certain situations requiring particular care in order to avoid injuries an damage to the unit, the installation or the building or property.
Situations that jeopardise the safety of those in the surrounding area or that put the unit itself a risk will be clearly indicated in this manual.
To indicate these situations, a series of special symbols will be used to clearly identify these situations.
Pay close attention to these symbols and to the messages following them, as your safety and that of others depends on it.

DANGER

• The text following this symbol contains information and instruc-tions relating directly to your safety and physical wellbeing.
• Not taking these instructions into account could lead to serious, very serious or even fatal injuries to you and others in the proximities of the unit.

In the text following the danger symbol you can also find information on safe procedures during unit installation.

CAUTION

• The text following this symbol contains information and instructions relating directly to your safety and physical wellbeing.
• Not taking these instructions into account could lead to minor injuries to you and others in the proximities of the unit.
• Not taking these instructions into account could lead to unit damage.

In the text following the caution symbol you can also find information on safe procedures during unit installation.

NOTE

• The text following this symbol contains information or instructions that may be of use or that require a more thorough explanation.
• Instructions regarding inspections to be made on unit parts or systems may also be included.

ADDITIONAL INFORMATION ABOUT SAFETY

DANGER

• DO NOT CONNECT THE POWER SUPPLY TO THE INDOOR UNIT AND DHW TANK PRIOR TO FILLING BOTH CIRCUITS WITH WATER AND CHECKING WATER PRESSURE AND THE TOTAL ABSENCE OF ANY WATER LEAKAGE.
• Do not pour water over the electrical parts. If the electrical components are in contact with water a seri ous electrical shock will take place.
• Do not touch or adjust the safety devices inside the air to water heat pump. If these devices are touched or adjusted, a serious accident can take place.
• In case of fire Turn OFF the main switch, put out the fire at once and contact your service contractor.
• It must ensure that the DHW tank cannot op erate accidentally without water neither with air inside hydraulic system.

CAUTION

• Do not use any sprays such as insecticide, lacquer, hair spray or other flammable gases within approximately one meter from the system.
• If installation circuit breaker or the unit fuse is often activated, stop the system and contact your service contractor.
• Do not make service or inspections tasks by yourself. This work must be performed by a qualified service person.
• This appliance must be used only by adult and capable people, having received the technical information or instructions to handle this appliance properly and safely.
• Children should be supervised to ensure that they do not play with the appliance.
• Do not let any foreign body into the water inlet and outlet piping of the DHW tank.

IMPORTANT NOTICE

• The supplementary information about the purchased products is supplied in a CD-ROM, which can be found bundled with the indoor unit. In case that the CD-ROM is missing or it is not readable, please contact your HITACHI dealer or distributor.
• PLEASE READ THE MANUAL AND THE FILES ON THE CD- ROM CAREFULLY BEFORE STARTING TO WORK ON THE INSTALLATION OF THE AIR TO WATER HEAT PUMP SYSTEM. Failure to observe the instructions for installation, use and operation described in this documentation may result in operating failure including potentially serious faults, or even the destruction of the air to water heat pump system.
• This document contains the information referred to the HITACHI DHW tank. The HITACHI DHW tank can be connected with the YUTAKI S, YUTAKI S80 indoor unit TYPE 1 or YUTAKI M. Please, refer to the Instruction manual (space heating information) or to the CD‑ROM bundled with the unit for the complete information of the system.
• Verify, in accordance with the manuals which appear in the outdoor, indoor unit and DHW tank, that all the information required for the correct installation of the system is included. If this is not the case, contact your distributor.
• HITACHI pursues a policy of continuous improvement in product design and performance. The right is therefore reserved to vary specifications without notice.
• HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
• No part of this manual may be reproduced without written permission.
• If you have any questions, contact your service contractor of HITACHI.
• Check and make sure that the explanations of each part of this manual correspond to your DHWT model.
• Refer to the models codification to confirm the main characteristics of your system.
• Signal words (NOTE, DANGER and CAUTION) are used to identify levels of hazard seriousness. Definitions for identifying hazard levels are provided in initial pages of this document.
• The operation modes of these units are controlled by the unit controller.
• This manual should be considered as a permanent part of the system. It gives a common description and information for this system which you operate as well as for other models.
• Keep the water temperature of the system above the freezing temperature.

• This manual should be considered as a permanent part of the DHWT. This manual gives a common description and information for this DHWT
• The secondary circuit (domestic water circuit) should be fitted with a pressure and temperature relief valve (pressure setting 7 bar; temperature setting 90ºC).
• The safety valve evacuating pipe must lead to a drain but this pipe must not be directly connected to the drain.
• The primary circuit (heating water circuit) should be fitted with a safety valve which is set at 3 bar, maximum Once the tank has been installed, firstly fill the secondary circuit (domestic water) and pressurise it.
• Once step 4 has been carried out, fill the primary circuit.
• lf the main pipe is not a stainless steel pipe then dielectric bushes must be fitted at secondary circuit connections.
• lf the cold water entry pressure is higher than the equipment’s design pressure a pressure reducer must be fitted with a pressure setting of less than the design pressure.
• To prevent heat loss through the hot water pipe in night rate storage systems, an anti-thermal siphon should be fitted at the storage tank outlet. The hot water pipe should be lagged (at least up to the anti-thermal siphon).
• Return circuits should be avoided when made of copper.
• This installation is subject to building regulations approval, notify local authority of intention to install.
• Please, leave the manual with the householder after installation.
• Cylinder relief valve connections should not be used for any other purpose.
• Siphoning the water from the secondary circuit (instructions):
  • Isolate the tank from the net pressure, i.e. through a cut-off valve in the cold water inlet.
  • Open the relief valve of the tank.
  • The hot sanitary water tank is emptied by siphon effect, through the discharge tube of the relief valve attached to the cold water inlet tube at the bottom of the tank.

INSTALLATION

PRODUCT GUIDE

GENERAL NOTES
Components at receipt

• DHWT-(200/300)S-3.0H2E is a stainless steel indirect water heater. The product is designed for heating domestic hot water from an external heat source such as heat pump.
• Unwrap the product carefully to avoid damage. Install the product on a flat, even surface designed to carry the full weight of the product when filled with water. Adjust the factory fitted adjustable feet as needed. The product must be installed in an upright, level position. All piping and electrical work must be performed by an authorized installer.
• Before filling unit with water it is recommended to fit the electric power cable, see “9.5 Electric heater”.
• On tilted floors the appliance must be installed upright and level by adjusting the built-in feet. Units must be securely fastened to the wall.
• This appliance is intended to be permanently connected to the main water supply.
• Only safety valve approved to NBI 06870/387 is allowed for use with this product.

INSTALLATION EXAMPLES

NOTE
For more information refer to Installation Manual of Yutaki System.

 BASIC TROUBLESHOOTING

CAUTION

• When water leakage occurs, stop the operation and contact your contractor.
• When you smell or white smoke occurs from the DHWT, stop the system and contact your contractor.

NO OPERATION

• Check whether the SET TEMPERATURE of YUTAKI system is set at the correct temperature.
• Check electrical connection from Unit and DHWT (Fuse or Circuit Breaker operation)
• Check Water Temperature and possible Thermostat Cut-Out activation (if higher than 90ºC > thermostat Cut-Out)
• Check Water Pressure and Water Flow (at least 0.1MPa.)
• Check that manual thermostat of DHWT are set at maximum water set point by YUTAKI System control (Check water set point by Anti-Legionella)

NOT HEATING WELL

• Check for obstruction of water flow inside Water Circuit.
• Check if the water pressure conditions is not within the operating range.
• Check electrical connection from Controller System and DHWT.
• In case of non-functioning heater should be checked.

IF TROUBLE STILL REMAINS…
If the trouble still remains even after checking the above items, contact your service contractor and inform the following data:

• Unit Model Name
• Trouble description

DIMENSIONAL DRAWINGS

DHWT(200/300)S‑3.0H2E

Code| Model| Capacity persons| Weight kg.| Freight vol m³| Heat‑up time

hrs ∆t 65°C

| Volume L| Heat loss W| Rating ErP
---|---|---|---|---|---|---|---|---
70544002| DHWT-200S-3.0H2E –

3kW/1x230V+coil 1,4m²

| 3,0| 53| 0,46| VP ≤ 10kW| 194| 47.3| B

70544003

| DHWT-300S-3.0H2E –

3kW/1x230V+coil 1,8m²

|

5,0

|

63

|

0,62

|

VP ≤ 12kW

|

284

|

62.8

|

B

NAME OF PARTS

DHWT(200/300)S‑3.0H2E

UNIT INSTALLATION

Transport the products as close as possible to the installation location before unpacking. Check the contents of the package:

• DHWT Model
• Installation and Operation Manual & Documents

SELECTION PROCEDURE FOR DHWT UNITS

CAUTION

• DHWT appliance is intended to be installed in an indoor place.
• DHWT installation must be done by professional installers.
• Install the DHWT with sufficient clearance around it for operation and maintenance as shown in the following figures.
• Install the DHWT where good ventilation is available. Do not install the DHWT where there is a high level of oil mist, salty air or sulphurous atmosphere.
• Working with no sufficient ventilation, in an enclosed space, should cause oxygen deficiency. Toxic gas should be produced when cleaning agent is heated to high temperature by, e.g., being exposed to fire.
• Do not install DHWT near any flammable substance.
• When installing some device next to DHWT, keep clearance between DHWT and any other obstacle of more than 500mm.

WORKING SPACE

• Check that DHWT are installed vertically.
• For cleaning, use no flammable and no toxic cleaning liquid. The use of flammable agents should cause explosion or fire.
• Cleaning liquid shall be collected after cleaning.
• Pay attention do not trap cables when closing the electrical box cover. It could cause a electric shock.

WATER SUPPLY CONTROL WARRANTY
Well water or river water could, in most cases, contain suspended solid matter, organic matter, and scales in big quantities.
Therefore, the water should be subjected to a filtration process or to a softener treatment by using chemical products before it’s application as a DHWT water.
It is also necessary to analyse the quality of the water by checking pH, electrical conductivity and others.The following is the recommended standard water quality:

NOTE
Water range will be according s/UNE 112076:2004 IN.

HYDRAULIC CIRCUIT
When Piping connections are performed:

1. Connect all pipes as close as possible to the unit, so that disconnection can be easily performed when required.

2. It is recommended to use flexible joints for the piping of water inlet and outlet, so vibration will not be transmitted.

3. Whenever possible, sluice valves should be installed for water piping, in order to minimise flow resistance and to maintain sufficient water flow.

4. It is recommended to apply ball valves in both water pipe connections to make easier any maintenance work.

5. Proper inspection should be performed to check for leaking 4 It is recommended to apply ball valves in both water pipe connections to make easier any maintenance work.
   5 Proper inspection should be performed to check for leaking

6. This DHWT must be fully air purged to avoid heating elements radiating the tank case without water.

7. Apply thermal insulation on the hydraulic system pipes in order to avoid accidental injure due to excessive heat on piping surfaces and also to avoid heat losses.

8. When the unit is stopped during shutdown periods and the ambient temperature is very low, it is possible that the water in the pipes and in the circulating pump freeze, thus damaging the pipes and the water pump. In order to prevent this, during shutdown periods it is useful to empty the water from the installation.

NOTE
Check periodically:

• Water flow and pressure
• Water leakage’s
• Fixing points tightening

CAUTION

• Inlet and outlet connection pipes must be 1G”
• It must be kept the water flow direction indicated in previous drawing.

PRESSURE DROPS

ELECTRICAL WIRING

GENERAL CHECK

1. Ensure that the field-supplied electrical components (mains power switches, circuit breakers, wires, connectors and wire terminals) have been properly selected according to the electrical data indicated. Make sure that they comply with national and regional electrical codes.
2. Electrical connection must be done by professional installer.
3. Check to ensure that the power supply voltage is within +/- 10% of the rated voltage.
4. Make ensure that power supply has an impedance low enough to warranty not reduce the starting voltage more than 85% of the rated voltage.
5. Check that the earth wire is securely connected, tagged and locked in accordance with national and local codes.
6. Connect a fuse of specified capacity.
7. Check periodically the electrical connection tightening.

CAUTION

• Check to ensure that screws for terminal block are tightly tightened.
• Protect the wires, drain pipe, electrical parts, from rats or other small animals. If not protected, rats may damage unprotected parts, and at the worst, a fire will occur.
• Wrap the accessory packing around the wires to protect the product from any condensed water and insects.
• Tightly secure the wires with the cord clamp inside the unit.
• Lead the wires avoiding any contact with water piping.
• Wrap the accessory packing around the wires from system controller.

DANGER

• Do not connect or adjust any wiring or connections unless the main power switch is OFF.
• When there are more than one power switch for ON/OFF, check and test to ensure that all are turned OFF.

WIRE SIZE
Recommended minimum sizes for field provided

__**Model| **Power Source| ** **Max Current| EH Power source cable size| Sensor cable size
---|---|---|---|---
EN60 335‑1| EN60 335‑1
DHWT| 1~ 230V 50Hz| 15A| 2.5mm2| 0.75mm2

NOTE

• Follow local codes and regulations when selecting field wires, Circuit Breakers and Earth Leakage Breakers.
• Use the wires which are not lighter than de ordinary polychloroprene sheated flexible cord (code designation H05RN-F).

ELECTRICAL WIRING CONNECTION
The electrical wiring connection between DHWT and YUTAKI system is as follows: Customer connection:

INTERNAL WIRING

ELECTRIC HEATER
The electric heater is made of Incoloy alloy 825 and complies with the European Low Voltage Directive 2006/95/EC.
It comprises a flange that holds three U-Shaped heating elements for 3.0kw power resistances.

ELECTRICAL INSTALLATION
Replacing the thermostat/element
Turn off power supply and remove electric central cover. Turn off water supply and drain unit. Unscrew wires on thermostat and element.
If only the thermostat is being replaced the wire on the element can be left on. The thermostat is removed by pulling it straight out from its sockets on the element.
The element can then be removed/replaced by using an element tool. Ensure the o-ring seal on the element is in place and undamaged before fitting the element.
Fill unit completely with water and make sure the element is not leaking. Fit wire to element. Install thermostat by pressing firmly.
Fit the electric wires to thermostat.

Tighten all wire connections thoroughly. Re-tighten after 3 months.
The electric central cover must be re-fitted and the unit must be filled with water before power is turned on.

SAFETY MEASURES

• Before any intervention, totally disconnect the DHWT from the main power supply. All the connections circuits must be disconnected.
• Installation, configuration, start up and maintenance of heating elements must be carried out by an authorised electrical fitter. All standards and regulations must be observed.
• The user is responsible of ensuring that the essential requirements of the European Low Voltage Directive are respected.
• Electric heating elements generates high temperatures. Precautions should be taken to protect goods and persons from accidental burns during the operation and after the equipment has been disconnected or installed.
• Note minimum cable section:
• Resistances of 3.0kw recommended cable: H05SJ-K accordance with UNE 21027, and will have at least 2.5mm² section.
• The tanks must be with a DHWT temperature control thermostat and an all-pole limiter thermostat (the setting of these two components must be compatible with the design parameters of storage tanks).
• We recommend installing appropriate safety devices (temperature safety device, safety level for heating liquids by natural convection, flow safety device for liquids in circulation, etc.)

SAFETY SUMMARY & CONTROL DEVICE SETTING

Protection
This switch cut out the operation on the DHWT when the water temperature inside DHWT exceed 90ºC.

GENERAL STANDARD FOR HYDRAULIC INSTALLATION

• The safety valve unit will fitted at the sanitary water installation.
• A pressure reducer must be placed in the DHWT installation. The nominal pressure of the safety unit will be 8 bar.
• When the main pressure is more than 6 bar a pressure reducer should be installed.
• The water discharge during heating (expansion) is normal. The volume of this discharge can be up to 3% of the storage tank’s capacity.
• The pressure regulator device must be working regularly, depending on the quality of water, in order to remove the lime’s deposits and verify that it is not blockade.
• A water leakage in the pressure protection device can exist. The discharge pipe should be always open to the atmosphere, free of frost and in continuous slope to the down side.
• Dielectric bushes must be fitted at the input and output sanitary water and at the tank circuit connections.
• Emptying the DHWT: Close the main inlet water valve and open the relief valve of the security water group.

Johnson Controls-Hitachi Air Conditioning Spain, S.A.U.
Ronda Shimizu, 1 – Políg. Ind. Can Torrella
08233 Vacarisses (Barcelona) Spain
© Copyright 2016 Johnson Controls-Hitachi Air Conditioning Spain, S.A.U. – All rights reserved.
Printed in Spain

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