Airwell MQL 8M [5/40] Access to the unit
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Page 4
Safety
OPERATOR: means a person authorised by the own-
er to do on Itelco-Clima unit all the regulation and
control operations expressly described in this manu-
al, that must be strictly complied with, without ex-
ceeding the scope of the tasks entrusted to him.
ENGINEER: means a person authorised directly by
Itelco-Clima or, in all EC countries, excluding Italy,
under his full responsibility, by the distributor of Itel-
co-Clima product, to perform any routine and extra-
ordinary maintenance operations, as well as any
regulation, control, servicing operations and the re-
placement of pieces, as may be necessary during the
life of the unit.
2.3 Access to the unit
The unit must be placed in an area which can be ac-
cessed also by OPERATORS and ENGINEERS; oth-
erwise the unit must be surrounded by a fence at not
less than 2 meters from the external surface of the
machine.
OPERATORS and ENGINEERS must enter the fenced
area only after wearing suitable clothing (safety
shoes, gloves, helmet etc.). The INSTALLER personnel
or any other visitor must always be accompanied by
an OPERATOR.
For no reason shall any unauthorised personnel be
left alone in contact with the unit.
2.4 General precautions
The OPERATOR must simply use the controls of the
unit; he must not open any panel, other than the one
providing access to the control module.
The INSTALLER must simply work on the connections
between plant and machine; he must not open any
panels of the machine and he must not enable any
control.
When you approach or work on the unit, follow the
precautions listed below:
h
do not wear loose clothing or jewellery or any oth-
er accessory tat may be caught in moving parts
h
wear suitable personal protective equipment
(gloves, goggles etc.) when you have to work in
the presence of free flames (welding operations) or
with compressed air
h
if the unit is placed in a closed room, wear ear pro-
tection devices
h
cut off connecting pipes, drain them in order to
balance the pressure to the atmospheric value be-
fore disconnecting them, disassemble connections,
filters, joints or other line items
h
do not use your hands to check for any pressure
drops
h
use tools in a good state of repair; be sure to have
understood the instructions before using them
h
be sure to have removed all tools, electrical cables
and any other objects before closing and starting
the unit again
2.5 Precautions against residual risks
Prevention of residual risks caused by the
control system
h
be sure to have perfectly understood the operating
instructions before carrying out any operation on
the control panel
h
when you have to work on the control panel, keep
always the operating instructions within reach
h
start the unit only after you have checked its perfect
connection to the plant
h
promptly inform the ENGINEER about any alarm
involving the unit
h
do not reset manual restoration alarms unless you
have identified and removed their cause
Prevention of residual mechanical risks
h
install the unit according to the instructions provid-
ed in this manual
h
carry out all the periodical maintenance opera-
tions prescribed by this manual
h
before opening any panelling of the machine,
make sure that it is secured to it by hinges
h
do not touch air condensation coils without wear-
ing protective gloves
h
do not remove the guards from moving elements
while the unit is running
h
check the correct position of the moving elements’
guards before restarting the unit
Prevention of residual electrical risks
h
connect the unit to the mains according to the in-
structions provided in this manual
h
periodically carry out all the maintenance opera-
tions specified by this manual
h
disconnect the unit from the mains by the external
disconnecting switch before opening the electrical
board
h
check the proper grounding of the unit before start-
up
h
check all the electrical connections, the connecting
cables, and in particular the insulation; replace
worn or damaged cables
Manuale MQL-MQH 10.6.2005 12:26 Pagina 4
Содержание
- Mql mqh 4 17 1
- Dismantling demolition and scrapping 2
- English 2
- Foreword 2
- General description 2
- Installation 2
- Maintenance 2
- Minichiller control 2
- Safety 2
- Spare parts 2
- Start up 2
- Table of contents 2
- Technical data 2
- Transport lifting and positioning 2
- Troubleshooting 2
- An introduction to the manual 3
- Emergency stop normal stop 3
- Foreword 3
- Introduction 3
- Warranty 3
- Definitions 4
- English 4
- Foreword 4
- Safety 4
- Access to the unit 5
- General precautions 5
- Precautions against residual risks 5
- Safety 5
- English 6
- Precautions during maintenance operations 6
- Safety 6
- Aus outlet 7
- Ein inlet 7
- Entrée entrata 7
- Safety 7
- Safety labels 7
- Sortie uscita 7
- English 8
- Safety 8
- Safety regulations 8
- Safety 9
- English 10
- Safety 10
- Anchoring 11
- Inspection 11
- Storage 11
- Transport lifting and positioning 11
- Unit handling 11
- English 12
- Installation 12
- Installation advices 12
- Fixing dimensions 13
- Installation 13
- Maintenance access 13
- English 14
- Installation 14
- Safety differential pressure switch 14
- Water connections 14
- Water piping 14
- Draining the defrosting waste water for heat pump unit only 15
- Hydraulic connection 15
- If the terminal unit is on a lower level than the mql mqh water chiller make sure the water pressure in the chiller is at least 0 bar 15
- Installation 15
- Page 14 15
- Pressure drop in tubes and accessories 15
- Principle diagram of water circuit 15
- Tabella n 2 15
- Table n 1 15
- The grey area shows pressure drop in mm of water gauge m and the velocity in m s recommended for various flows and diameters intermediate values are determined through interpo lation values outside the grey area correspond to exces sive pressure drops and should be avoided table n 2 shows the equivalent length pipe with the same diameter of a few common accessories for this type of installation 15
- The heat pump units must be installed in positions where the defrosting water cannot create any dam age 15
- The mql mqh are to be connected with the termi nal units such as fan coil units cassettes or wall mounted units each terminal unit connected with the mql mqh water chiller and provided with its own control is therefore completely independent of the chiller see diagram of principle on the left 15
- The water inlet outlet fittings shall conform to the in structions provided by the plates affixed neat the connection points 15
- To determine the appropriated pipe section see table n 1 which shows the values of pressure drop for various water flows and the diameter of stan dard copper pipes for hydraulic installations 15
- When heat pump units work in heating mode dur ing defrosting cycles they may discharge water from the base 15
- Electrical connections 16
- English 16
- Installation 16
- Power supply 16
- Preliminary check 17
- Start up 17
- Checking the operation 18
- Delivery to the customer 18
- English 18
- Start up 18
- Before start up 19
- Control system 19
- Minichiller control 19
- Operating instructions 19
- Starting and using the unit 19
- Alarms table 20
- An anomalous noise in the compressor 20
- Control system 20
- English 20
- Failure diagnostics 20
- If the unit is powered by 3 phase current it is essential that the compressor turns in the correct direction the direction of rotation of scroll compressors is fixed the direction of rotation is wrong when while the unit is working you can feel 20
- If you exchange the connections of two out of three phases the compressor inverts the direc tion of rotation and these phenomena disappear suddenly 20
- In case of summer winter switching through re mote contact the unit will operate in cool ing mode when this contact is closed and in heating mode when it is open 20
- Meaning possible cause corrective action 20
- The lack of the correct differential between dis charge pressure and suction pressure i e if the discharge pressure is just above the suc tion pressure 20
- General description 21
- General specifications 21
- Introduction 21
- Air exchanger 22
- Compressors 22
- Coolant circuit 22
- English 22
- General description 22
- Water exchanger 22
- General description 23
- Outline refrigerator mqh hp 4 8 23
- Outline refrigerator mql 10 17 23
- Page 22 23
- English 24
- General description 24
- Outline refrigerator mqh 10 17 24
- Page 23 24
- Page 24 25
- Technical data 25
- English 26
- Page 25 26
- Technical data 26
- Page 26 27
- Technical data 27
- English 28
- Page 27 28
- Technical data 28
- Electrical data compressors 29
- Page 28 29
- Technical data 29
- Unit electrical data 29
- English 30
- Fans electrical data 30
- Page 29 30
- Technical data 30
- Mql mqh 10 17 31
- Mql mqh 4 8 31
- Overall dimensions 31
- Page 30 31
- Technical data 31
- Clearences 32
- English 32
- Technical data 32
- General requirements 33
- Maintenance 33
- Planned maintenance 33
- Compressor 34
- Condenser 34
- Dehydrating filter 34
- English 34
- Maintenance 34
- Refrigerant charge 34
- Evaporator 35
- Maintenance 35
- Thermostatic expansion valve only mql mqh 4 8 35
- English 36
- Troubleshooting 36
- Troubleshooting 37
- English 38
- Oil for compressors 38
- Spare part list 38
- Spare parts 38
- Wiring diagrams 38
- Dismantling demolition and scrapping 39
- Generalities 39
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