To Insulate The Water Piping - Daikin EWAA008D2V3P-H Installation Manual

Packaged air-cooled water chillers and packaged air to water heat pumps

Hide thumbs Also See for EWAA008D2V3P-H:

Operation manual (20 pages)

User reference manual (60 pages)

Installer's reference manual (236 pages)

Table Of Contents

Table of Contents

5 Piping installation

WARNING

Due to the presence of glycol, corrosion of the system is

possible. Uninhibited glycol will turn acidic under the

influence of oxygen. This process is accelerated by the

presence of copper and high temperatures. The acidic

uninhibited glycol attacks metal surfaces and forms

galvanic corrosion cells that cause severe damage to the

system. Therefore it is important that:

▪ the water treatment is correctly executed by a qualified

water specialist,

▪ a glycol with corrosion inhibitors is selected to

counteract acids formed by the oxidation of glycols,

▪ no automotive glycol is used because their corrosion

inhibitors have a limited lifetime and contain silicates

which can foul or plug the system,

▪ galvanized pipes are NOT used in glycol systems since

the presence may lead to the precipitation of certain

components in the glycol's corrosion inhibitor.

NOTICE

Glycol absorbs water from its environment. Therefore do

NOT add glycol that has been exposed to air. Leaving the

cap off the glycol container causes the concentration of

water to increase. The glycol concentration is then lower

than assumed. As a result, the hydraulic components

might freeze up after all. Take preventive actions to ensure

a minimal exposure of the glycol to air.

Types of glycol

The following types of glycol are allowed:

▪ Ethylene glycol;

▪ Propylene glycol, including the necessary inhibitors, classified as

Category III according to EN1717.

Required concentration of glycol

The required concentration of glycol depends on the lowest

expected outdoor temperature, and on whether you want to protect

the system from bursting or from freezing. To prevent the system

from freezing, more glycol is required.

Add glycol according to the table below.

Lowest expected

Prevent from

outdoor

bursting

temperature

–5°C

10%

–10°C

15%

–15°C

20%

–20°C

25%

–25°C

30%

–30°C

35%

INFORMATION

▪ Protection against bursting: the glycol will prevent the

piping from bursting, but NOT the liquid inside the

piping from freezing.

▪ Protection against freezing: the glycol will prevent the

liquid inside the piping from freezing.

Installation manual

Glycol and the maximum allowed water volume

Adding glycol to the water circuit reduces the maximum allowed

water volume of the system. For more information, see the installer

reference guide (topic "To check the water volume and flow rate").

Glycol setting

Freeze protection by freeze protection valves

About freeze protection valves

When no glycol is added to the water, you can use freeze protection

valves to drain the water from the system before it can freeze.

▪ Install freeze protection valves (optional – field supply) at all

lowest points of the field piping.

▪ Normally closed valves (recommended – field supply) can prevent

that all water from indoor piping is drained when the freeze

protection valves open.

Prevent from

freezing

For more information, see the installer reference guide.

15%

5.2.4

25%

35%

The piping in the complete water circuit MUST be insulated to

prevent condensation during cooling operation and reduction of the

—

heating and cooling capacity.

—

Outdoor water piping insulation

—

For piping in free air, it is recommended to use the insulation

thickness as shown in below table as a minimum (with λ=0.039 W/

mK).

Piping length (m)

<20

20~30

30~40

40~50

NOTICE

▪ The required concentration might differ depending on

the type of glycol. ALWAYS compare the requirements

from the table above with the specifications provided by

the glycol manufacturer. If necessary, meet the

requirements set by the glycol manufacturer.

▪ The added concentration of glycol should NEVER

exceed 35%.

▪ If the liquid in the system is frozen, the pump will NOT

be able to start. Mind that if you only prevent the

system from bursting, the liquid inside might still freeze.

▪ When water is at standstill inside the system, the

system is very likely to freeze and get damaged.

NOTICE

If glycol is present in the system, setting [E-0D] must be

set to 1. If the glycol setting is NOT set correctly, the liquid

inside the piping can freeze.

NOTICE

When freeze protection valves are installed, set the

minimum cooling setpoint (default=7°C) at least 2°C higher

than the maximum opening temperature of the freeze

protection valve. If lower, freeze protection valves can

open during cooling operation.