Water Content Per Linear Metre Of Pipeline; Installation Technical Notes; Cleaning And Filling The Hydraulic Circuits; Water Quality - Mitsubishi Electric w-MEXT Serie Manual De Instalación, Uso Y Mantenimiento

w-MEXT
2.3.4

WATER CONTENT PER LINEAR METRE OF PIPELINE

Pipe diameter 1/2" 3/4" 1"
Litres 0.2 0.37 0.58
2.3.5

INSTALLATION TECHNICAL NOTES


The connection pipes must be suitably supported so that they do not weigh
down on the machine.

Avoid rigid connections between the machine and the pipes, and install
vibration dampers.

For the temperatures values, the minimum and maximum water flow rates
and the volumes of water in the heat exchanger hydraulic circuit refer to the
technical bulletin.

Any heating elements installed to prevent the pipes from freezing must be
kept away from devices, sensors and materials that the heating elements
could damage or cause to malfunction (for example, temperature sensors,
plastic components and power cables).
2.3.6

CLEANING AND FILLING THE HYDRAULIC CIRCUITS

OBLIGATION
Wash the pipes of the hydraulic circuits to remove any
processing residues and other dirt inside.
This operation must be performed to avoid damaging the parts
of the machine.
After washing, check the hydraulic circuits for any leaks. To do this, load the circuits at a
pressure higher than atmospheric pressure and check that there are no pressure leaks over
time.
INFORMATION
The thermal insulation of the pipes outside the machine is the
responsibility of the INSTALLER and must only be completed after
ascertaining that there are no leaks.
Do not use fluids other than water or ethylene glycol/propylene glycol water solutions in the
hydraulic circuit.
OVER UNDER air relief valve
OVER UNDER DF air relief valve
OVER DL air relief valve
UM_w-MEXT_01_Z_10_20_ML
1 1 2
2" 3"
1/4" 1/2" 1/2"
1.02 1.38 2.21 3.85 5.28
2.3.7

WATER QUALITY

OBLIGATION
The valuesshown in the table must be guaranteed during the entire
life cycle of the machine.
Description
1 Hydrogen ions
2 Presence of calcium (Ca) and
magnesium (Mg)
3 Chloride ions
4 Iron ions
5 Manganese ions
6 Carbon dioxide
7 Hydrogen sulphide
8 Oxygen
9 Chlorine
10 Ammonia NH
3
11 Ratio between carbonates and
sulphates
12 Sulphate ions
13 Phosphate ions
where: 1/1.78°D = 1°Fr with 1°Fr = 10 gr CaCO
parts per billion
Explanatory notes:
ref. 1: Concentrations of hydrogen ions greater than those indicated implies a high
risk of deposits, whereas concentrations of hydrogen ions lower than those
indicated implies a high risk of corrosion;
ref. 2: The hardness measures the amount of Ca and Mg carbonate dissolved in the
water with a temperature lower than 100°C (temporary hardness). A high
hardness implies a high risk of deposits.
ref. 3: Concentrations of chloride ions higher than those indicated causes corrosion;
ref. 4 - 5 - 8: The presence of iron and manganese ions and oxygen leads to corrosion
ref. 6 - 7: Carbon dioxide and hydrogen sulphide are impurities that promote corrosion
ref. 9: In water from the waterworks it is a value of between 0.2 and 0.3 ppm. High
values cause corrosion
ref. 10: The presence of ammonia reinforces the oxidising power of oxygen
ref. 11: Below the value shown in the table, there is a risk of corrosion due to the
trigger of galvanic currents between copper and other less noble metals.
ref. 12: The presence of sulphate ions leads to corrosion
ref. 13: The presence of phosphate ions leads to corrosion
Checks should be carried out on a regular basis, taking samples at various points of the
hydraulic system.
During the first year of operation, it is recommended to perform checks every 4 months.
Checks can then be performed once every six months as from the second year of
operation.
OBLIGATION
Parameter values outside the indicated ranges may lead to the
formation of deposits and scale, and/or encourage the occurrence
of corrosive phenomena inside the system. In case of service fluids
other than water (e.g. ethylene or propylene glycol), it is advisable
to always use special inhibitors that offer thermal stability within
the operating temperature ranges and protection against corrosion
phenomena.
It is absolutely essential that, in the presence of dirty and/or
aggressive water, an intermediate heat exchanger is placed
upstream of the heat exchangers.
2.3.8

ANTI-FREEZE MIXES

In systems not adequately protected by electric heaters, protect the hydraulic circuit with an
anti-freeze solution when the outside air temperature can fall below 5°C.
Minimum external air temperature
ETHYLENE GLYCOL
(% suggested by weight)
Minimum external air temperature
PROPYLENE GLYCOL
(% suggested by weight)
The values shown are indicative and may vary depending on the manufacturer. Refer to
your glycol supplier for more details.
The values indicated consider a precautionary difference of 5°C between the minimum
outside air temperature and the freezing temperature of the solution.
Do not use fluids other than water or ethylene glycol/propylene glycol water solutions in the
hydraulic circuit.
24
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
English
Symbol Range values
pH 7.5 to 9
Hardness 4 ÷ 8.5 °D
Cl - < 150 ppm
Fe < 0.5 ppm
3+
Mn 2+ < 0.05 ppm
CO < 10 ppm
2
H S < 50 ppb
2
O < 0.1 ppm
2
Cl < 0.5 ppm
2
NH < 0.5 ppm
3
HCO -/SO > 1
2-
3 4
SO -- < 100 ppm
4
PO 3- < 2.0 ppm
4
/ m 3 - ppm = parts per million - ppb =
3
°C 5 0 -5 -10 -15 -20 -25 -30
% 0 12 20 30 35 40
°C 5 2 -3 -9 -13 -17 -23 -29
% 0 10 20 30 35 40
45 50
45 50