Instructions For Startup - RHOSS TCHEY 115 Instrucciones De Uso

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II.7

INSTRUCTIONS FOR STARTUP

IMPORTANT !
Machine commissioning or the first start up (wh ere
provided for) must be car ried out b y skilled
personnel from workshops authorised b y RHOSS
S.p.A. qualified to work on this t yp e of product.
IMPORTANT !
The use and maintenance m anual r egarding the
pumps and safet y valves ( wher e present is attached
to this manual and must b e read thoroughly.
IMPORTANT !
Several hours befor e start-up (at least 12) apply
voltage to the machin e in ord er to po wer the
electrical resistances for heating the compr essor
guard. These r esistances disconnect automatically
at ever y mach ine start-up.
DANGER !
Before starting up, m ake sur e that the in stallation
and electrical connections conform with the
instructions in the wiring diagram . Also make sure
that there ar e no unauthorised per sons in the
vicinit y of the machine dur ing the above oper ations.
DANGER !
The 122÷240 units are equipped with safet y valves
positioned insid e the technical compartment; their
intervention causes a noise and violent sprays of
refrigerant and oil. It is prohib ited to approach the
safet y valves intervention pressur e valu e. The
safet y valves are conveyable accord ing to that
prescr ibed b y the manufacturer f the valves
themselves.
II.7.1
CONFIGURATION
Safet y component calibration settings
Interventio
Pressure switch
high pressure
low pressure
water differential
safety val ve
on the high press ure
DANGER ! (122÷240)
The safet y valve on the high pr essure side is
calibr ated at 41.7 bar. This could intervene if the
calibr ation value is r eached during the loading
operations of the r efriger ant, inducing a leak that
could cau se burn s (as the other valves in the
circuit).
Configuration parameter s
Summer worki ng temper ature set-point
Winter working temperature s et-point (THHEY)
Wor king temperature differential
Antifreeze temper ature set-point
Antifreeze temper ature differential
Water differenti al press ure s witch time upon start-up
Water differential pressure switch exclusion time upon start-up
Circulation pump s witch off time delay
Minimum time between two c onsec uti ve compress or start-ups
The units are tested in the fac tor y, where they are also c alibrated and
the default par ameter s ettings are put in. These guarantee that the
appliances r un c orrectly in rated wor king conditions . Machi ne
configuration is carried out in the factor y and should never be altered.
Reset
n
40.2 bar
28 bar - Automatic
2 bar
3.3 bar - Automatic
80 mbar
105 mbar - Automatic
41.7 bar
-
Standard setting
II.7.2
STARTING THE UNI T
Befor e starti ng the unit, perfor m the following chec ks :
○ The el ectricity power suppl y must c ompl y with the specifications on
the data plate and/or the wiring diagram and it must fall within the
followi ng limits:
 Variation of the power suppl y frequenc y: ±2 Hz;
 variation of the power suppl y voltage: ±10% of the nominal voltage;
 imbal ance between the suppl y phas es: <2% .
○ the electrical power s uppl y s ys tem must be able to suppl y adequate
current and be suitabl y sized to handle the load;
○ open the electric panel and make s ure the terminals of the power
suppl y and of the c ontactors are tight (they may have c ome loose
during trans port, which c ould lead to malfunctions);
○ chec k that the water s ystem i nlet and outlet pipes ar e connected in
accordance with the arrows next to the mac hine water inlet/outl et;
Electrical connec tions must be made in compliance with the l ocal
installation standards i n force in the plac e where the unit is i nstalled,
and with the i nstructions in the wiring diagram provided with the unit.
For the sizing of the s uppl y cables, r efer to what is s et out i n the wiring
diagram.
The mac hine c an be started by pressing the ON/OFF key on the
keyboard built into the machine. Using the MODE key, s elect an
operating mode (chiller or heat-pump). Any probl ems the s ystem
encounters will be i mmediatel y s hown on the dis play on the control
keyboard. At start-up, the first device to s tart in the s ystem is the pump,
which has priority over the rest of the s ystem. During this phase, the
minimum water flow differential pr essure s witc h and the low pr essure
switch are ignored for a preset time, i n order to avoid variations c aus ed
by air bubbles or turbulenc e in the water circuit or by press ure
fluctuations in the c ooling circuit. Onc e these time-delays are over, final
enabling is given to the mac hine, followed after another safety time-lag
by the compressor.
II.7.3
PROLONGED SHUTDOWN
7°C
45°C
2°C
2.5°C
2°C
When the machine is out of use for long periods of time, it is nec essar y
120"
to disc onnect it from the mains by opening the master s witch.
15"
All the water c ontained in the circuit must be drai ned in good ti me.
15"
During installation, consider mi xing the water in the circuit with the
360"
correct proportion of ethylene gl ycol to guarantee protec tion against
freezing.
II.7.4
STARTUP AFTER PROLONGED SHUTDOWN
Befor e starti ng up again, make s ure that:
 there is no air in the water s ystem (bleed it if necess ary);
 water in the heat exchanger is circulati ng in the required amount.
37
SECTION II: INST ALL ATION AND MAINTEN ANCE
DANGER !
Always use the m aster switch to isolate the unit
from the mains before carr ying out an y
maintenance wor k on the unit, even if it is for
inspection purposes only. Make sure that no one
accidentally supplies po wer to the mach ine – lock
the master switch in the z ero position.
IMPORTANT !
If a unit is used for the production of chilled water,
check the adjustment of the thermostatic valve.
IMPORTANT !
On three-phase models, b efore conn ecting the m ain
power supply cables L1-L2-L3+N to the termin als of
the general isolator, m ake sur e that they ar e in the
right order.
IMPORTANT !
If the unit is not used during the winter period, the
water contained in the system may freez e.
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