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7.8 Scroll compressors (size 2, 3, 4, 5, 6)
Refer to 7.11, 7.12, 7.13.
1. Define operation type
- maximum capacity available (MC)
- constant supply control (CS)
- high air flow (HA)
2. set air flow setpoint
3. set temperature setpoint
4. set humidity setpoint
5. confirm setting
7.10 Operation type setting
7 - START-UP
i
7.14 Start-up report
To detect the objective operational conditions is useful to
control the unit over time.
With the unit running, meaning in stable conditions and near
the work ones, detect the following data:
Overall absorptions and voltages with unit in full load
Absorptions of the various electric loads
(compressors, fans, pumps etc)
Temperatures and flow rates of the various fluids
(water, air) at input and output of the unit
Temperatures and pressures in the feature points of
the cooling circuit (compressor, liquid, suction drain/
unload)
The detections must be kept and made available during
maintenance interventions.
From Directive 97/23 EC PED derive the prescriptions for the
installers, the users and the maintenance operators of the unit
also.
Refer to the local implemented standards; in synthesis and for
merely indicative purposes:
Compulsory check of first system:
only for units assembled on site by the installer (e.g.
cond direct expansion unit)
Declaration of start-up:
for all units
Periodical checks:
to be carried out as frequently as defined by the
Manufacturer
(see MAINTENANCE section) .
7.15 EC Directive 97/23 PED
Check the air and water temperatures are within the
operational limits.
Start the unit; refer to the "Adjustment" section for indications
on the control system.
With the unit running, meaning in stable conditions and near
the work ones, check:
power supply voltage
unit overall absorption
absorption of the individual electric loads.
7.7 Voltages
Check the remote controls (ON-OFF, etc.) are connected
and, if necessary, enabled with relative parameters
(ELECTRIC CONNECTIONS sections and following pages)
Check the probes or optional components are connected and
enabled with the relative parameters.
7.9 Remote consents
The Scroll compressors have only one direction of rotation.
In the event that the direction is reversed, the compressor will
not be damaged, but its noisiness will increase and pumping
will be negatively affected.
After a few minutes, the compressor will stop because of the
activation of the thermal protection.
In this event, cut the power and reverse the 2 phases on the
machine power.
Prevent the compressor from working with in reverse rotation:
more than 2-3 anomalous starts up can damage it.
Make sure the direction of rotation is correct, measure the
condensation and suction pressure.
Pressure must clearly differ: at the start, the suction pressure
decreases whilst the condensation pressure increases.
