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SECTION II: INSTALLATION AND MAINTENANCE
II.7
START-UP PROCEDURE
IMPORTANT!
Machine commissioning or the first start up (where
provided for) must be carried out by skilled
personnel from workshops authorised, qualified to
work on this type of products.
IMPORTANT!
The use and maintenance manuals for the pumps,
fans and any safety valves are attached to this
manual and should be read throughout.
DANGER!
Before starting up, make sure that the installation
and electrical connections conform to the wiring
diagram. Also make sure that no unauthorised
persons are near the unit during the above-
mentioned operations.
DANGER!
The units are equipped with safety valves located
inside the technical compartment and coil
compartment. When they trip, they cause a loud
noise and violent refrigerant and oil leaks. Do not
approach the safety valve tripping pressure value.
The safety valves can be channelled in accordance
with that stipulated by the valve manufacturers.
IMPORTANT!
A few hours before starting up the unit (at least 12),
supply power to the machine in order to power the
electrical resistances designed to heat up the
compressor crankcase. Each time the unit starts up
the crankcase resistances switch off automatically.
Before starting the unit, perform the following checks:
o
The electrical supply must comply with the specifications on the data
plate and/or the wiring diagram and it must fall within the following
limits:
variation of the power supply frequency. ±2 Hz;
variation of the power supply voltage: ±10% of the nominal voltage;
unbalance between the supply phases: <2%.
o
The electrical supply must supply adequate current to withstand the
load.
o
Open the electric panel and make sure the terminals of the power
supply and of the contactors are tightened (they may loosen during
transport, which could lead to malfunctions).
IMPORTANT!
The electrical connections must be made in
compliance with the installation regulations in force
in the place where the unit is installed, and with the
wiring diagram supplied with the unit.
When all the connections have been made, the unit may be
commissioned after the following points have been checked.
II.7.1.1
Adjusting the number of revolutions of the
fan
Instructions for adjusting the number of revolutions of the fans
according to the residual head request.
The fans are adjustable with a 0-10V signal but the flow rate / head at
10 V can be higher than necessary as the fan is adjustable with a wide
range of available head (from 50 to 250 Pa).
The unit is factory-set with an available head of 250 Pa.
When the available head required is less than that available it is
appropriate to limit the maximum rotation speed of the fan to prevent
the flow rate, and therefore the noise as well as power consumption,
from exceeding the design values.
The following operations must be carried out with the compressors
switched off:
The limitation must be carried out during machine installation with the
final channels already installed.
Calibration must be performed on site as follows:
Install a differential pressure switch, measuring the pressure in the
intake and outlet channels of the machine immediately before and after
the unit, making sure that the capacity indicated in the technical
documentation corresponds with the detected value.
Or in summer, adjust with the nominal condition (12/7 35°C amb) and
Dt between condensation and air between 15-17°C.
The identified signal value must be saved as the maximum outlet value
from the control.
The condensation/evaporation control will then adjust the fan speed
between this maximum value and 0.
Summary of Contents for EQU-PF 2100
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