Bedienungsanleitung REMKO KWK ZW serie (Seite 23 von 40) (Englisch)

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2-conductor system for cooling and heating

As the 2-conductor system must cool and heat

equally, for reasons of convection during winter

operation, a valve assembly is stipulated for all

installation methods for this system operation to

avoid undesirable heat emission.

4-conductor system for cooling and heating

As the 4-conductor system must cool and heat

equally, two valve assemblies are stipulated for this

system operation for the cooling and heating reg-

ister.

Connection of the medium pipings

nThe connection of the lines on-site takes place

on the rear or underside of the unit.

nFor the purpose of servicing, connections must

be equipped with shut-off valves and the

medium flow rate adjusted using valves for

hydronic balancing.

nAdditional automatic bleed valves are to be

provided in the supply and return flow at the

installation’s highest point.

nThe medium pipings may not exert any struc-

tural load on the unit.

nThe line connections may not generate any

thermal or mechanical stresses on the unit. If

necessary, cool the piping or support with the

second tool.

Necessary system components

Valve assembly for 2 or 4-conductor systems

(accessory)

In 2 or 4-conductor systems, cold or warm medium

is fed through the heat exchanger(s) into the unit

and cold or warm air can be discharged. Regula-

tion is provided by a 3-way valve assembly. It con-

sists of the electrically actuated valve head and the

valve body. If the head is electrically activated, it

actuates the body, which routes the medium into

the register. If the temperature is reached, the

head is switched off and the medium is fed past

the heat exchanger through the bypass. The

bypass serves to ensure the minimum medium

flow rate for the chiller.

The time between being fully open and fully

closed can be approx. three minutes.

Valves for hydronic balancing

The calculated individual pressure losses in the

pipeline network layout for each individual unit are

adjusted to the entire system with hydronic bal-

ancing valves to be provided by the customer. The

nominal flow rates for the medium adjust to the

values needed as a consequence of the pressure

loss.

Anti-freeze protection (accessories)

A water glycol mix is generally used as the medium

for a cold water system. Depending on the glycol

type and quantity used, the viscosity changes, the

pressure loss increases and the unit's cooling or

heating capacity reduces.

All system components must be approved for use

with glycol.

NOTICE!

The product and safety data sheets of the

glycol type used must be observed during use

and disposal.

Diaphragm expansion vessel (MAG)

To avoid pressure fluctuations during standstill

because of temperature changes, diaphragm

expansion vessels filled with nitrogen (moisture

neutral) must be integrated in the system.

No moisture can condense in the nitrogen filler.

Safety valve

Safety valves limit excess operating pressure due

to excess warming or overfilling of the operating

medium. The valve outlet requires unobstructed

draining into a drain line. Applicable local disposal

ordinances must be observed if glycol is used.

Automatic bleed valves

The unit has one or two manual bleed valves on

the collector pipe of the register. The unit can be

bled separately after the system has been filled.

Automatic bleed valves must also be installed at

the next highest point in the collective lines.

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REMKO KWK ZW serie Seite 23

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