Bedienungsanleitung REMKO KWG750 (Seite 27 von 60) (Englisch)

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Minimum / maximum volume

ﬂow rate

The circulation pump of the chiller

generates a constant medium

volume ﬂow rate; a pressure loss

in the system and in the chiller is

the result. The differential pres-

sure switch / ﬂow monitor in the

chiller measures the medium pres-

sure loss through the evaporator

and switches off the unit in case

the minimum volume ﬂow rate is

undershot.

In addition, a medium volume ﬂow

rate that is too high must not be

exceeded (maximum volume ﬂow

rate).

To guarantee a constant volume

ﬂow rate, three way valves with a

bypass, a hydraulic switch for the

setup of a primary and secondary

circuit, or a bypass that depends

on the volume ﬂow rate are re-

quired.

Pressure and temperature indica-

tors

The pressure and temperature in-

dicators to be installed in the inlet

and outlet on site are used to set

the medium volume ﬂow rate. The

indicators should be lockable.

The chiller contains temperature

sensors in the medium inlet, me-

dium outlet, and condenser. Using

the controller, the sensor values

can be queried.

Line regulating valves

Using line regulating valves

provided on site, the individual

pressure losses calculated in the

pipe network design are adapted

to each individual unit in the

overall system. Due to the pressure

loss, the nominal volume ﬂow

rates of the medium are adapted

to the required values.

Flow monitor / differential pres-

sure monitor

Flow monitors are used to monitor

the minimum medium volume

ﬂow rate and are installed in the

standard version of units with the

medium storage tank (KWG...SP/

KWP...SP).

For units without a medium stor-

age tank (KWG, KWG...P, KWP,

KWP...P), ﬂow monitors must

be installed on site and adjusted

according to the nominal volume

ﬂow rate in the pipe network.

Electrically, the monitors must be

connected to the terminals pro-

vided in the switch cabinet (see the

separate wiring diagram).

Minimum medium volume, sys-

tem

A minimum medium volume of

the system of 4.0 l/kW per output

stage must not be undershot. For

units with a heat pump function

(KWP), a minimum medium vol-

ume of 6.0 l/kW is required.

To guarantee more constant tem-

peratures in the medium circuit,

higher volumes may be required.

Pressure switch for medium circuit

(only for KWG...SP and KWP...SP)

A pressure switch in the medium

circuit monitors the current me-

dium pressure and switches off the

circulation pump and thus the unit

when the plant pressure is too low.

For the adjustment of the circula-

tion pump, we recommend that a

main line regulating valve be pro-

vided in the vicinity of the unit.

NOTE

Guarantee of the minimum volume ﬂow rate through a three-way valve

Correct

installation

Incorrect

installation

Two-way

valve

Three-way

valve

External medium storage tank for

KWG (...P) and KWP (...P)

For the KWG, KWG...P, KWP, and

KWP...P units, additional medium

storage tanks are required.

If, for example, the required out-

put of the cold water consumers is

considerably lower than the gener-

ated cooling capacity of the chiller,

we recommend that the medium

contents be increased. The me-

dium pipes, for example, could be

oversized or an additional storage

tank could be used to increase the

compressor operating time.

If the minimum medium volume

of the system is not reached, a

storage tank must generally be

provided.

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