Danfoss 73690010 Brazed Plate Heat Exchanger Installation Guide

Danfoss 73690010 Brazed Plate Heat Exchanger

Product Information

The Brazed Plate Heat Exchanger is a type of heat exchanger manufactured and supplied by Danfoss. The product is available in various languages and is equipped with safety features to prevent hazardous situations. The product is made in Slovenia and comes with a 12-month warranty from the date of installation, which can be extended up to 18 months from the date of delivery.

Product Usage Instructions

Installation

1. Ensure that all necessary assembly, start-up, and maintenance work is performed only by qualified and authorized personnel.
2. Connect the brazed plate heat exchanger according to the instructions provided in the manual.
3. Refer to Table 1 for the maximum allowable torque for copper (CU) PHE (fig. 3).
4. Refer to Table 2 for the maximum allowable torque for pin bolts.

Start-up

1. Close all valves connected to the heat exchanger.

Operation

• Ensure that the heat exchanger has good corrosion resistance.

Shutdown:

• Follow the instructions provided in the manual for proper shutdown of the heat exchanger.

Maintenance

• Perform necessary maintenance work only by qualified and authorized personnel.
• Refer to the manual for instructions on the maintenance of the heat exchanger.

Important Note

• Failure to comply with the warnings and instructions contained in the manual may void any warranty.

Identification label

Lifting Torque force

1-pass 2-pass

FOREWORD
Brazed plate heat exchanger This manual is applicable for all Brazed plate heat exchangers (below PHE) manufactured and supplied by Danfoss.

Warning!
All SAFETY ALERT notices are applicable to environment/health and safety regulations.

Warning!
The symbol indicates the type of Hazard. A dangerous situation that, may lead to moderate or serious injury and death.

Important note!
The symbol indicates a dangerous situation that, may lead to property damage if not avoided.

INTRODUCTION

Necessary assembly, start-up, and maintenance work must only be performed by qualified and authorized personnel. Danfoss offers as a standard 12-month warranty from the date of installation and not longer than 18 months from the date of delivery. The warranty is not valid if PHE is installed incorrectly and/or not applied to the instructions in this document. Danfoss cannot be held responsible for damages arising from incorrect installation or operation. Failure to comply with the warnings and instructions contained herein may void any warranty.

Important note!
Sudden pressure peaks beyond the normal operating pressure (or pressure surges) which can occur during starting up or stopping of the system can severely damage the PHE and should be prevented. Danfoss cannot be held responsible for any damage as a result of any operation deviating from the original design conditions.

SAFETY ALERT NOTICES
The following should be respected by installing/ running/servicing PHE: Keeping current local safety regulations.

Warning!
Before any maintenance begins ensure that the PHEs are pressure-less and cooled below 40 ºC to prevent the risk of burns.

Warning!
Use gloves for preventing any injury from sharp edges when handling PHE. In all cases ensure that all laws and regulations are strictly kept concerning human/ environment protection.

BEFORE INSTALLATION

The package containing PHE should be opened carefully. Check the specification and that all the components are included and they are undamaged.

Important note!
Max working pressure and temperature limits are marked on the label. These must be considered and shall never be exceeded. Always check the product identification label (Fig. 1) to make sure that PHE is suited for the operating conditions. The parameters given on the product label should not be exceeded during installation and operation. Lifting and handling the Brazed plate heat exchanger.

Warning!
To prevent personal injury, always use appropriate hoisting equipment. If you are to lift the PHE itself, straps should be used.

Warning!
To prevent personal injury, maintain a safe separation of 3 m when lifting PHE.

Warning!
To prevent personal injury from sharp edges when handling PHE use safety gloves. Please follow the below guideline for lifting the heat exchanger:

1. Place straps as shown in Fig. 2
2.  Lifting in vertical position.
3.  Lower the heat exchanger slowly to a vertical position and place it on its feet.
4. Remove the straps
5. Tighten the heat exchanger to the floor.

INSTALLATION

In general, the PHE is installed so that flows of the media through it is in the opposite direction (Fig. 4.1) Connecting the Brazed plate heat exchanger

Important note!
All safety equipment that is required by pressure and vessel regulation must be installed accordingly. When the pipe system is connected with the PHE make sure that no loads from the piping (including torque effects) are transferred from the piping system to the heat exchanger. The pipe system should be isolated against pressure pulsations, vibrations, and any thermal shock when connected to the heat exchanger. For single-phase applications, Danfoss PHE should be mounted in a vertical position or horizontal position with all connections facing To support the PHE, it is advisable to use a mounting bracket fitted at the bottom of the heat exchanger. The PHE has not been designed to withstand excessive forces from earthquakes, wind, fire, vibration, missing or failing support, excessive forces from the piping, etc. It is the system designer or end user’s responsibility to protect the plate heat exchanger and reduce the damage risk.

The space between adjacent PHE, walls, and other components, should be at least 100 mm to have enough space for service and maintenance (e.g. removing insulation, replacing and cleaning the PHE). Furthermore, there can be local standards and regulations which should be met. A safety valve should be installed between t heat exchanger and the shut-off valves on the secondary side of the PHE. If the safety valve is not installed, thermal expansion n of fluid might destroy the PHE when the shut-off valves are
closed. The pipes must be connected in a way that the stress caused by them (e.g., thermal expansion), does not harm the PHE. The pipes should be equipped with brackets to prevent any torsion stress to be concentrated at the heat exchanger’s pipe connections. The maximum allowable connection loads are given in Table 1 below and are valid for Cu brazed PHE. If additional fatigue stress is involved, additional analysis should be done. For products brazed with other than Cu brazing materials, please contact sales representative for clarification.

Connection| Mt

(Nm)

| Mb

(Nm)

| Ft

(kN)

| Fs

(kN)

---|---|---|---|---
3/4″| 80| 13| 2.2| 0.5
1″| 150| 40| 3.8| 1
5/4″| 200| 90| 6| 2
1 1/2″| 300| 110| 6.8| 4
2″| 500| 220| 11| 4.8
2 1/2″| 1000| 220| 11| 4.8

Table 1: Maximum allowable Torque force for Cu PHE (Fig. 3)
For PHE with welded-on mounting stud bolts follow the maximum allowable loads during assembly is given in Table 2:

Stud bolts| Mt

(Nm)

---|---
M6| 3
M8| 5
M10| 6

Table 2: Maximum allowable Torque force
STARTUP
If there is a need to pressure test the whole system, where the heat exchanger is installed, make sure the testing pressure and procedure is following PED testing requirements. During the installation and operation, PHE pressure shall never exceed the maximum allowable design pressure.

Startup sequence:

1. Close all valves connected to the heat exchanger.
2. Fill up and ventilate the coldest side first.
3. Open the valves gradually and start the circulation pump. Keep opening the valves gradually until they are open to designed values.
4. Repeat point 3 on the hot side.
5. Start the automatic control. The surface of PHE might reach the temperature,
6.  equal to the temperature of the working media.

Warning!
Apply necessary precautions on all contact surfaces to avoid hot burns.

OPERATION
For the highest efficiency of heat transfer, the media should flow in Counter current flow (Fig. 4). To prevent clogging of the heat exchanger by different mechanical particles, please make sure you have filters on each inlet of the PHE.

Table 3: Mesh size
Corrosion resistance For checking the corrosion resistance of the heat exchanger under different chemical compositions of working media in a single- phase application please use Danfoss water quality recommendations available at Danfoss.com. Please follow Danfoss.com / Products / Heat exchangers / Brazed heat exchangers / Documents / Declaration – BF: Guideline of Water Quality for copper brazed Plate Heat Exchangers On the above location you can find Product approvals and Declaration of conformity. Avoid any media, which could be corrosive to the materials of the Brazed plate heat exchanger.

Warning!
Flow rate changes must be implemented slowly in order to defend the PHE against sudden and extreme temperature and pressure variations

Important note!
In the case of hard water be advised that limescale starts actively depositing if the temperature of the water is above 60 °C. Protection against thermal or pressure stress should be ensured during the operation of the heat exchanger:

1. Adjustment of flow rate should be done slowly to prevent extreme changes in pressure and temperature.
2. The temperature sensor should be located as close as possible to the outlet connections of the heat exchanger
3. Control equipment (such as valves and controllers) should be able to give stable temperatures and pressures
4. To avoid water hammers don’t use quick closing valves (for example – on/off valves)
5. Programming of controls should ensure minimum amplitude and frequency of the pressure variation during the start/operation/ stop of the system.

Liquid evaporation warning: in case the temperature on the hot side of the heat exchanger is higher than 100 °C, make sure on the cold the circuit is high enough to avoid evaporation of liquid.

CLOSE DOWN

Important note!
Incorrect PHE operation stops may lead to water hammer damage. Close-down sequence:

1. Close the hot side by means of slow adjustment of the control valve. Full flow on the cold side should be kept.
2. When the control valve is totally shut down, the pump must be switched off.
3. Slowly close down the cold side, and stop the pump.
4. Close all shutoff valves.
5. If the PHE will be closed down for a long time, it should be drained. Also, it should be drained if there is a risk of freezing the heat transfer media inside the PHE due to low ambient temperature. Damages of PHE, made by frozen media inside are not covered by the warranty

CLEANING OF HEAT EXCHANGER
Warning!
Always use protective equipment as gloves and eye protection when using cleaning agents. Backwash water cleaning can be recommended to remove light adhesive particles from the heat exchanger. It should be performed with high- speed water flow, going in the direction, opposite to the direction of flow in normal operation.

In case the heat exchanger cannot be cleaned by backwash, CIP equipment should be used to chemically clean the PHE. Choose a cleaning compound based on the type of contamination inside the PHE. Please follow the user’s manual of the CIP machine and chemicals producer. Make sure selected cleaning compounds are not damaging the materials of the heat PHE (Stainless steel heat plates; copper or stainless-steel brazing materials). Make sure all safety measures are used in accordance to the user’s manual of the CIP producer. Before putting PHE back to operation please make sure it is flushed by fresh water, so no chemicals go in the system circuits.

STORAGE

If the PHE must be stored, make sure it is protected from the environment. No mechanical or thermal stresses should be applied to the PHE during storage. Storage temperature should be between -20 °C to +60 °C and humidity between 30 % to 90 %. Make sure foreign objects or liquids don’t get inside the heat exchanger during storage.

UTILIZATION
Warning!
This product should be dismantled and its components sorted, if possible, in various groups before recycling or disposal. Always follow the local disposal regulations. For any further information, please contact your local Danfoss representative or your local Danfoss company.

IMPORTER / ІМПОРТЕР
UK: Danfoss Ltd., 22 Wycombe End, HP9 1NB, GB Official language section for this operations manual is English, all the others are translations

DanfossA/S
ENGINEERING TOMORROW

• Climate Solutions climatesolutions.danfoss.com  +45 7488 2222  E-Mail: climatesolutions@danfoss.com
• Any information, including, but not limited to information on the selection of the product, its application or use, product design, weight, dimensions, capacity, or any other technical data in product manuals, catalogs descriptions, advertisements, etc., and whether made available in writing, orally, electronically, online or via download, shall be considered informative and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogs, brochures, videos, and other material.
• Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to the form, fit, or function of the product.
• All trademarks in this material are property of Danfoss A/5 or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/5. All rights reserved.

References

• Engineering Tomorrow | Danfoss
• Danfoss España: Soluciones innovadoras y ahorro de energía | Danfoss
• Danfoss Engineering Tomorrow - ontdek energie-efficiënte en innovatieve oplossingen voor uw branche | Danfoss

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