MTD 400 Manuel de service télécharger pdf (Page 9)

9GB 01/2009 AWR MTD - AWR MTD/B

WATER CIRCUIT DATA

I A

Water content in the system

Size 0011 0025 0031 0041 0031 0041 0051 0061

Minimum water content l 24 31,5 40 46 40 46 57 74

cPf

cdp

12%

0,985

1,02

1,07

20%

0,98

1,04

1,11

28%

0,974

1,075

1,18

35%

0,97

1,11

1,22

40%

0,965

1,14

1,24

Ethylene glycol solutions

Water and ethylene glycol solutions used as a heat carrier in

the place of water reduce the performance of the unit.

Multiply the performance figures by the values given in the

following table.

0 -5 -10 -15 -20 -25

Freezing point (°C)

Percentage of ethylene glycol in weight

cPf: cooling capacity correction factor

cQ flow rate correction factor

cdp: pressure drop correction factor

f1: capacity correction factor

fk1: compressor power input correction factor

fx1: total power input correction factor

Fouling factors

The performance data given refer to conditions with clean

evaporator plates (fouling factor=1).

For different fouling factors, multiply the figures in the perfor-

mance tables by the coefficient given in the following table.

4,4 x 10

-5

0,86 x 10

-4

1,72 x10

-4

0,96

0,93

0,99

0,98

0,99

0,98

Fouling factors

°C/W) f1

Evaporator

fk1 fx1

FILLING THE SYSTEM

- Before starting to fill, place the unit mains

switch QF1 in the OFF position.

- Before filling, check that the system drain

valve is closed.

- Open all system and terminal air vents.

- Open system shut off valves.

- Start filling by slowly opening the system water fill valve out-

side the unit.

- When water begins to leak out of the terminal air vent valves,

close them and continue filling until the pressure gauge indi-

cates a pressure of 1.5 bar.

The system must be filled to a pressure of between 1

and 2 bars.

It is recommended that this operation be repeated after

the unit has been operating for a number of hours. The

pressure in the system should be checked regularly and

if it drops below 1 bar, the water content should be

topped-up.

Check the tightness of the joints.

EMPTYING THE SYSTEM

- Before starting to empty, place switch QF1

in the “OFF” position

- Make sure the system fill/top-up water

valve is closed.

- Open the drain valve outside the unit and

all the installation and terminal air vent

valves..

If the fluid in the circuit contains antifreeze, it should

not be allowed to drain freely, as it is pollutant.

It should be collected for possible reuse.

When draining after heat pump operation, take care as

the water may be hot (up to 50°).

OFF

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MTD 400 Manuel de service Page 9

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