Installation, Operation and Maintenance Manual
D–EIMAC01511-17EN
Installation, Operation and Maintenance Manual
Air cooled chiller with
screw compressor
EWAD~T~B
Refrigerant: R-134a
Original Instructions
Contents
Description ................................................................................................................................................................ 6
General Information .................................................................................................................................................. 6
Receiving the unit ..................................................................................................................................................... 6
Operating limits ........................................................................................................................................................ 6
Storing Storage .............................................................................................................................................................. 6
Operation ........................................................................................................................................................................ 6
Mechanical Installation............................................................................................................................................. 8
Safety ............................................................................................................................................................................. 8
Noise .............................................................................................................................................................................. 8
Moving and lifting ........................................................................................................................................................... 8
Positioning and assembly ............................................................................................................................................... 8
Minimum space requirements ...................................................................................................................................... 11
Sound protection .......................................................................................................................................................... 14
Water piping ................................................................................................................................................................. 14
Water treatment ............................................................................................................................................................ 14
Evaporator and recovery exchangers anti-freeze protection ........................................................................................ 14
Installing the flow switch ............................................................................................................................................... 14
Heat recovery ............................................................................................................................................................... 15
Electrical Installation .............................................................................................................................................. 16
General specifications .................................................................................................................................................. 16
Operation ................................................................................................................................................................. 16
Operator’s responsibilities ............................................................................................................................................ 16
Maintenance ............................................................................................................................................................ 16
Routine maintenance.................................................................................................................................................... 16
Unit Maintenance and Cleaning ................................................................................................................................... 18
Microchannel Coil Maintenance ................................................................................................................................... 18
Service and limited warranty ................................................................................................................................. 19
Periodic obligatory checks and starting up of appliances under pressure ....................................................... 19
Important information regarding the refrigerant used ........................................................................................ 19
Disposal ................................................................................................................................................................... 19
Factory and Field charged units instructions ...................................................................................................... 20
List of figures
Figure 1 - Typical refrigerant circuit ............................................................................................................................ 3
Figure 2 - Typical refrigerant circuit with heat recovery .............................................................................................. 4
Figure 3 - Description of the labels applied to the electrical panel .............................................................................. 7
Figure 4– Lifting .......................................................................................................................................................... 9
Figure 5– Unit Levelling ............................................................................................................................................ 11
Figure 6- Minimum clearance requirements.............................................................................................................. 12
Figure 7 – Multiple Chiller Installation ................................................................................................ ....................... 13
Figure 8 - Water piping connection for evaporator .................................................................................................... 15
Figure 9 - Water piping connection for heat recovery exchangers ............................................................................ 15
D–EIMAC01511–17EN - 2/21
Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connections.
Figure 1 - Typical refrigerant circuit
D-EIMAC01511-17EN - 3/21
Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connections.
Figure 2 - Typical refrigerant circuit with heat recovery
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Legend
1
Compressor
2
Evaporator
3
Condenser coil & Axial fan
4
Electronic expansion valve
5
Economizer
6
Dehydration filter
7
Liquid and humidity indicator
8
Sution valve
9
Economizer electronic expansion valve
10
Low-pressure safety valve
11
High-pressure safety valve
12
Heat exchanger (VFD cooling)
13
Heat exchanger (VFD cooling) solenoid valve
14
Discharge shut off valve
15
Liquid line isolating valve
16
¼” SAE Flare valve
17
Evaporator water inlet connection
18
Evaporator water outlet connection
19
2 Way charging valve
20
Heat Recovery (Optional)
21
Heat Recovery water outlet connection
22
Heat Recovery water inlet connection
F13-F13A
High pressure switch
DT
Discharge temperature sensor
CPT
Condenser pressure transducer
EPT
Evaporator pressure transducer
ST
Suction temperature sensor
PTeco
Economizer pressure transducer
TTeco
Economizer temperature transducer
TTvfd
VFD Temperature transducer
EEWT
Evaporator Entering Water Temperature probe
ELWT
Evaporator Leaving Water Temperature probe
D-EIMAC01511-17EN - 5/21
This manual is an important supporting document for qualified personnel but it is not intended to replace such personnel.
READ THIS MANUAL CAREFULLY BEFORE INSTALLING AND STARTING UP THE UNIT.
IMPROPER INSTALLATION COULD RESULT IN ELECTRIC SHOCK, SHORT-CIRCUIT, LEAKS, FIRE OR OTHER DAMAGE TO
THE EQUIPMENT OR INJURE TO PEOPLE.
THE UNIT MUST BE INSTALLED BY A PROFESSIONAL OPERATOR/TECHNICIAN
UNIT STARTUP HAS TO BE PERFORMED BY AUTHORIZED AND TRAINED PROFESSIONAL
ALL ACTIVITIES HAVE TO BE PERFORMED ACCORDING TO LOCAL LAWS AND REGULATION.
UNIT INSTALLATION AND START UP IS ABOSOLUTELY FORBIDDEN IF ALL INSTRUCTION CONTAINED IN THIS MANUAL
ARE NOT CLEAR.
IF CASE OF DOUBT CONTACT THE MANUFACTURER REPRESENTATIVE FOR ADVICE AND INFORMATION.
Thank you for purchasing this chiller
Description
The unit you bought is an “air cooled chiller”, a machine aimed to cool water (or water-glycol mixture) within the limits described in the
following. The unit operation is based on vapour compression, condensation and evaporation according to reverse Carnot cycle. The main
components are:
- Screw compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure
- Evaporator, where the low pressure liquid refrigerant evaporates to cool the water
- Condenser, where high pressure vapour condensate rejecting heat removed from the chilled water in the atmosphere thanks to an
air cooled heat exchanger.
- Expansion valve allowing to reduced the pressure of condensed liquid from condensation pressure to evaporation pressure.
General Information
All units are delivered with wiring diagrams, certified drawings, nameplate; and DOC (Declaration Of Conformity); these
documents show all technical data for the unit you have bought and they MUST BE CONSIDERED ESSENTIAL DOCUMENTS OF
THIS MANUAL
In case of any discrepancy between this manual and the equipment’s documents please refer to on board documents. In case of any
doubt contact the manufacturer representative.
The purpose of this manual is to allow the installer and the qualified operator to ensure proper installation, commissioning and maintenance
of the unit, without any risk to people, animals and/or objects.
Receiving the unit
The unit must be inspected for any possible damage immediately upon reaching final place of installation. All components described in
the delivery note must be inspected and checked.
Should the unit be damaged, do not remove the damaged material and immediately report the damage to the transportation company and
request they inspect the unit..
Immediately report the damage to the manufacturer representative, a set of photographs are helpful in recognizing responsibility.
Damage must not be repaired before the inspection of the transportation company representative.
Before installing the unit, check that the model and power supply voltage shown on the nameplate are correct. Responsibility for any
damage after acceptance of the unit cannot be attributed to the manufacturer.
Operating limits
Storing Storage
Environmental conditions must be within the following limits:
Minimum ambient temperature : -20°C
Maximum ambient temperature : 57°C
Maximum R.H. : 95% not condensing
Storing below the minimum temperature may cause damage to components. Storing above the maximum temperature causes opening
of safety valves. Storing in condensing atmosphere may damage electronic components.
Operation
Operation is allowed within the following limits:
D-EIMAC01511-17EN - 6/21
Operational envelope can be extended through selection of specific options (such as high ambient kit, brine version, etc) which allow the
unit to operate with evaporator leaving water temperature below +4°C and/or ambient temperature at full load above 45°C.
The above mentioned values represent a guideline, please refer to the chiller selection software for real operating limits for the specific
model.
As a general rule, the unit should be operated with an evaporator water flow rate between 50% and 120% of nominal flow rate (at standard
operating conditions), however check with the chiller selection software the correct minimum and maximum allowed values for the specific
model.
Operation out of the mentioned limits may damage the unit.
In case of doubts contact manufacturer representative.
Figure 3 - Description of the labels applied to the electrical panel
Double circuits unit
D-EIMAC01511-17EN - 7/21
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