Introduction; Foreword; Responsibility; Inspection - Liebert CBH 017 Service Manual

1 --- Introduction

1.1 --- Foreword

This handbook is aimed at enabling 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 equipment for the correct installation, opera-
tion and maintenance in compliance with the local regulations
in force.
The MATRIX S [017 ---032] water chillers can be identified as fol-
lows:
CBH023

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 freecooling 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 its representa-
tive.

1.4 --- General description

MATRIX S units with air cooled condensers have been designed
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 S" product line has been designed utilising the
state ---of ---the ---art techniques available nowadays in the indus-
Cooling Capacity "kW"
Nominal cooling capacity x 10
Compressor:
H Hermetic Scroll
Version:
B Base
L Low Noise
Q Quiet
Execution:
C Chiller
S Superchiller
try, and includes all the components necessary for automatic
and efficient operation.
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.
All the units are equipped with one or two independent refrigerat-
ing circuits, each one composed of: an air cooled condenser, a
hermetic Scroll compressors 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 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 hermetic scroll compressors are complete with the following
protection/safety devices: oil heater, electronic protection moni-
toring 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). The "MATRIX
S" water chillers are controlled by the "MICROFACE" micropro-
cessor, managing all the unit operating conditions. The user can
change and/or modify the operating parameters through the di-
splay 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 ranges (see
Tab. 7). These limits apply to new machines, subject to correct
installation and maintenance.
Ambient air minimum temperature: ---25ûC for Superchiller,
S
+15ûC for Chiller without fan speed control (Operation al-
lowed only in summer mode), ---10ûC for Chiller with contin-
uous fan speed control (Either Triac or EC fan);
Maximum outdoor air temperature is in relation to each mod-
S
el, as indicated in Tab. 7. In any case outdoor temperatures
aver 45ûC are not admitted; such limits are determined by
electrical and electronic components fitted on units;
Maximum water flow allowed: depending on the pressure
S
drop corresponding to the required thermal difference (usu-
ally not lower than 3.5ûC --- 4ûC);
Minimum allowed water flow: compatible with a sufficient
S
evaporation temperature, to avoid the intervention of the
safety devices (to be evaluated for a thermal difference not
higher than 8ûC);
Temperature range of the water exiting the evaporator: 4ûC
S
--- 15ûC;
Maximum temperature of the water entering the unit: 20ûC;
S
higher temperatures are allowed only at the system start---
up and not during normal operation;
Maximum glycol concentration: 50% (35% with the optional
S
pump assembly installed on the machine);
Minimum allowed glycol concentration: depending on the
S
minimum temperature of the ambient air expected at the
installation site (see Tab. a);
Maximum pressure of the hydraulic circuit: 5 bar;
S
Voltage range for the electric supply: 400 V
S
phase difference: 3%; tolerance on frequency: 1%.
Storage conditions: from ---20ûC to 45ûC for all MATRIX S mod-
els
Note:
Avoid positioning in areas with strong dominant winds that may
impair the operation and effect the indicated limits.
1
+
/ 10%; max.
---