Start-Up; Configuration; Maintenance; Scheduled Maintenance - RHOSS CMA/E 14 Gebrauchsanweisung

II.3

START-UP

II.3.1

CONFIGURATION

The units are factory tested, where they are also calibrated and the
default parameter settings are inserted. These guarantee that the
appliances run correctly in rated working conditions. The configuration
of the machine is set up at the factory and should never be altered.
Calibration of safety components
High pressure switch
Low pressure switch
Configuration parameters
Maximum defrost time (*) 8 min.
Minimum time between two consecutive defrosting procedures (*)
Low pressure switch lockout period on startup
Minimum time between two compressor startups
Minimum timelag on compressor startup
(*) CMR/E only
II.3.2 START-UP
IMPORTANT!
The user and service manual for the safety valve is
enclosed with this manual and must be read in their
entirety.

DANGER!

At any time when the gas charge is being topped
up, do NOT approach the preset blowoff levels of
the safety valves. When they are set off, there is a
loud and violent outburst of gas and oil.
Before starting up the unit, make the following checks:
• the power supply must correspond to the value shown on the rating
plate, with variation within ±10%, and with phase differences within 3%;
• the electrical power supply system must be able to supply adequate
current and be suitably sized to handle the load;
• open the electric panel and make sure the power supply terminals
and contactors are tightened (they may have loosened during transport,
with the consequent risk of malfunction);
• make sure the heat exchanger is properly ventilated and clean.
Several hours before starting, switch on the power to the unit in
order to supply the electrical heater to heat up the compressor
crankcase.
II.4

MAINTENANCE

DANGER!
Maintenance work must only be carried out by
qualified technicians authorised to work on air-
conditioning and refrigeration systems.
Use suitable work gloves.
DANGER!
Do not introduce pointed objects through the air
delivery intake grilles.
DANGER!
Always disconnect the unit from the mains power
supply using the disconnect switch before carrying
out maintenance work or checks. Make sure that no
one accidentally switches on the machine: secure
the main switch in the Off position.
II.4.1

SCHEDULED MAINTENANCE

II.4.1.1 Cooling circuit
○ Checking the refrigerant charge
Fit a pressure gauge on the test point on the outlet side and another on
the test point on the suction side. Start up the unit and check both
pressure readings once the pressure has stabilised.
○
Checking for refrigerant leaks
Use a leak detector or soapy water to check the refrigerant circuit.
○
Checking the condition of the heat-exchanger
Switch off the unit, check the heat exchanger and, depending on its
condition, proceed as follows:
• remove any foreign bodies from the finned surface which may
obstruct air flow;
• remove dust deposits with a jet of compressed air; wash with water,
using a brush to gently clean the surfaces;
• dry with compressed air.
SECTION II: INSTALLATION AND MAINTENANCE
Cutin
26.9 bar
0.7 bar
Default setting
12 min
45 min
120 sec.
360 sec
180 sec.
II.4.1.2 Electrical circuit
DANGER!
Maintenance work must only be carried out by
qualified technicians authorised to work on air-
conditioning and refrigeration systems.
Use suitable work gloves.
DANGER!
Always disconnect the unit from the mains power
supply using the disconnect switch before carrying
out maintenance work or checks.
Make sure that no one acidentally switches the
machine on; secure the main switch in the Off
position.
The following checks must be performed on the electrical circuit:
• check the unit power absorption using a clamp meter and compare
the reading with the values shown in the enclosures (A1);
• inspect and, if necessary, tighten the electrical contacts and
terminals.
II.4.2

NON-SCHEDULED MAINTENANCE

DANGER!
Maintenance work must only be carried out by
qualified technicians authorised to work on air-
conditioning and refrigeration systems. Use
suitable work gloves.
DANGER!
Do not introduce pointed objects through the air
delivery intake grilles.
II.4.2.1 Instructions for the replacement of
components
Before replacing components, discharge refrigerant from both the high
and low pressure sides. If the refrigerant is discharged from the high
pressure side only, the compressor may close the circuit thereby
preventing pressure equalisation. In this way, the low pressure side of
the casing and the suction line may remain pressurised. If, in this
situation, a brazing torch is applied to one of the unit's low pressure
components, the pressurised mixture of coolant and oil discharged from
the circuit may ignite on contact with the flame.
To avoid this hazard, make sure both the high and low pressure sides
of the circuit have been correctly depressurised before applying brazing
torches, etc..
24
Reset
20.0 bar
2.2 bar