Liebert CRH 004, Руководство по обслуживанию

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1
1 --- Introduction
1.1 --- Foreword
Thishandbook isaimed atenabling both the installer and the op-
erator to carry out the correct installation, operation and mainte-
nance of the refrigerating machine, without damaging it or caus-
ing injuries to the relevant staff.
The handbook is thus an aid for the qualified staff in the arrange-
ment of the specific equipmentfor the correct installation, opera-
tion and maintenance in compliance with the local regulations
in force.
The
MATRIX R
water chillers can be identified as follows:
CRH004
Version:
R
Radial
Execution:
C
Chiller
S Superchiller
Compressor:
H
Hermetic Scroll
Cooling Capacity “kW”
Nominal cooling capacity / 10
1.2 --- Responsibility
Liebert Hiross accepts no present or future responsibility for
damage to persons, things or to the machine itself due to opera-
tors’ negligence, failing to comply with the installation, operation
and maintenance instructions of this handbook, failed applica-
tion of the safety norms in force for the system and the qualified
staff charged with the operation and maintenance.
1.3 --- Inspection
All units are fully assembled and wired in the manufacturing
plant. Before shipment they are charged with the necessary
quantities of refrigerant and oil and then tested at the operating
conditions normally required by the customer. The machine’s
hydraulic circuit is equipped with drain plugs and open vent
valves; the free---cooling coils are supplied dry to avoid possible
problems due to frost in the storage period. Immediately inspect
the machine carefully on delivery to check for damage during
transportation or missing components; possible claims must be
made immediately to the carrier and the factory or itsrepresenta-
tive.
1.4 --- General description
MATRIX R units with air---cooled condensers have been de-
signed and manufactured for producing chilled water.
They are also available in versions with a built---in freecooling
module, in versions with heat recovery for simultaneous heating
of thermal circuit water, with a pump assembly installed on the
machine and/or inertial buffer tank inside the machine; the chill-
ing units can be equipped with several options indicated in the
price list.
The ”MATRIX R” product line has been designed utilising the
state---of---the---art techniques available nowadays in the indus-
try, and includes all the components necessary for automatic
and efficient operation.
The Matrix R units are specifically designed for indoor installa-
tion (protected from weather agents), for the connection with
ducts of condensation air in machine intake (if present) and
outlet.
Each unit is completely factory assembled; after evacuation, the
necessary quantity of refrigerant is added to the refrigerant cir-
cuit(s) and the unit is tested.
Allthe unitsare equipped with one or two independentrefrigerat-
ing circuits, each one composed of: an air---cooled condenser,
a hermetic Scroll compressor and a braze---welded plate evapo-
rator. The components of the liquid line are the charging valves,
filters---dryers, solenoid valve, shut---off valve, moisture indicator
and thermostatic expansion valve.
The hydraulic circuit --- with max. working pressure 5 bar --- is
made up on mod. 004---016 of hydraulic lines both in steel and
flexible EPDM rubber, connected by fittings and threaded joints,
on mod. 017---032 of carbon steel pipes connected with
grooved---end (Victaulic) fittings and couplings and include also
a flow switch (optional) and, in the freecooling versions, chilled
water coils and a three---way valve.
The hermeticscroll compressorsare complete with the following
protection/safety devices: oil heater (if necessary), electronic
protection monitoring the temperature of the motor windings
and the direction of rotation (the latter may be enclosed in the
electronics of the compressor or external, depending on the
model).
Fans are radial type, with aluminum reverse curved blades and
structure, statically and dynamically balanced, directly coupled
to a motor with external rotor. It is always available the fan speed
control which normally is achieved through an adjuster with con-
tinuous speed modulation.
By simply modifying the parameters (of the Microface micropro-
cessor control), limiting the fan max. rotation speed, it ispossible
to change the useful air static pressure (equal to the difference
of the static pressure between the delivery and suction ducts
connected with the unit).
The ”MATRIX R” water chillers are controlled by the ”MICROFA-
CE” microprocessor, managing all the unit operating conditions.
The user can change and/or modify the operating parameters
through the display keyboard installed on the electrical panel.
The electrical control board is equipped with all the safety and
operating devices required for reliable operation. The compres-
sor motors are equipped with protection on all three phases and
are started by three---pole contactors.
2 --- Preliminary Operations
2.1 --- Operating limits
The units can operate within the indicated operating limits (see
Tab. 6). These limits apply to new machines, subject to correct
installation and maintenance.
S
Ambient air minimum temperature: ---25 û C for Superchiller,
---10 û C for Chiller (either Triac or EC fan);
S
Maximum outdoor air temperature is in relation to each mod-
el, as indicated in Tab. 6. In any case outdoor temperatures
aver 45 û C are not admitted; such limits are determined by
electrical and electronic components fitted on units;
S
Maximum water flow allowed: depending on the pressure
drop corresponding to the required thermal difference (usu-
ally not lower than 3.5 û C --- 4 û C);
S
Minimum allowed water flow: compatible with a sufficient
evaporation temperature, to avoid the intervention of the
safety devices (to be evaluated for a thermal difference not
higher than 8 û C);
S
Temperature range of the water exiting the evaporator: 4 û C
--- 15 û C;
S
Maximum temperature of the water entering the unit: 20 û C;
higher temperatures are allowed only at the system start---
up and not during normal operation;
S
Maximum glycol concentration: 50% (35% with the optional
pump assembly installed on the machine);