Eurodifroid ERI Manuel D'installation Et D'utilisation page 7

 HYDRAULIC CONNECTIONS
SPECIFICATIONS :
- Fit valves at chiller's inlets/outlets so that it can be insulated in case of maintenance
- Install a pressure gauge (if not fitted as standard) on the cooler outlet so that the pump delivery pressure can be read
and the flow rate established
- Should the hydraulic circuit be closed, then, fit an automatic valve to prevent pump's breakage (Avalaible option).
The required process flow rate can then be easily set using this valve.
1/ Connect the chiller's inlets/outlets to the pipes of the process or machine to be cooled (after checking compatibility
between process head loss and pump pressure).
2/ To avoid condensation on the pipes and reduce energy loss, lag the network pipes using insulating sheath with a
suitable thermal insulation ratio.
3/ Chiller's connections must comply with the required dimensions; to avoid increasing the head loss, do not install the
cooler too far from the process. In any case, establish pressure head loss of the circuit and be sure that the pump is
OK; (In any doubt, contact our technical service.)
4/ Ensure the fluid to be cooled flows in the correct direction.
5/ Fit venting systems at high points so that any air in the cooling circuit can be removed.
 ELECTRICAL CONNECTIONS
REFER TO THE ENCLOSED ELECTRICAL DIAGRAM
Check that power supply voltage and frequency complies with the values indicated on the chiller. Use a suitable power
lead for the total power and voltage of the equipment. To comply with electrical rules, the power lead must be correctly
sized, and protected by a circuit breaker of suitable capacity.
The circulation pump must operate continuously. The regulation switch actuates the compressor. Should the
compressor operates while there is no flow (pump stopped), the frigorific and hydraulic equipment will be damaged.
Our chillers are provided with free voltage contact allowing user to controle it by distance. To see where connection
has to be done, please refer to electrical diagram.
DO NOT OPERATE THE COMPRESSOR WITHOUT WATER FLOW
THE PUMP MUST OPERATE CONTINUOUSLY
 PLEASE NOTE
For air condensing units, fan and compressor operates simultaneously.
For water condensing units, user must ensure that the condenser is continuously connected to water flow. Securities
must be instored to ensure that the power supply is cutted in case of very low water flow.
For an integrated chiller (ERI type), some configurations (usually three-phase) require wiring of each component.
The user must make the connections on the appropriate terminal block. The above principles must be observed.
Selection of protection devices for actuators (motor fans, compressors, pumps, resistors, etc.) and wiring must be
carried out by qualified personnel in accordance to electrical standards.
For more information, please contact our customer services :
 COOLANT PREPARATION
FILTRATION
Coolant liquid must be clean. If necessary, install a filtering unit on inlet chiller.
ANTIFREEZE PROTECTION
Wintering (option EXTT)
It is necessary to put antifreeze in the hydraulic circuit from a negative
temperature ambient.
Cooling power >30KW
For all units upper at 30KW, it is necessary to put antifreeze in the
hydraulic circuit.
Maintenance
The addition of antifreeze will stop the spread of algae and corrosion in
the circuit. We recommend replacing the antifreeze every year.
Low temperature's production
For output temperatures desired below 5°C, it is essential to put
antifreeze in the hydraulic circuit in proportions defined in the table below
cons. (Sticker on the cooler). To produce chilled water at low temperature some modifications has to be made on the
chiller. Check that your machine was built to allow this possibility.
In case of non-conformity, Components destroyed as the result of setting an excessively low output temperature on a
standard cooler will not be replaced under the guarantee.
EURODIFROID sells ready-to-use coolant containing glycol, specifically for low temperature's chillers. Please contact
our technical department for analysis and quotation.
If users decide not to use this antifreeze they must realize that consequences such as the freezing up of the
evaporator or pump will under no circumstances be covered by guarantee.
Note: Frigorific performances may be reduced by addition of not adapted glycol.
Direct line : +33 (0) 241 766 706
Standard : +33 (0) 241 762 840
: eurodifroid.service@eurodifroid.fr