TCF ANL020, Installation Manual

ANL - ANLH 020-202

28

8. CHECKS AND FIRST START-UP

8. CHECKS AND FIRST START-UP

8.1. PREPARING FOR FIRST START-UP

It is reminded that for units of this se-

ries, if requested by the Aermec client 

or the legal owner and only on ITA-

LIAN territory, free start-up is provided 

by the regional Aermec technical as-

sistance service. The start-up must be 

previously agreed based on the inten-

ded time of completion of installation. 

Before the start-up all the works (elec-

trical and hydraulic connections, fi lling 

and venting of air in the system) must 

be completed.

8.2. START-UP

8.2.1. PRELIMINARY CHECKS

BEFORE POWERING UP
Check:

1.  All safety precautions have been 

followed.

2.  The unit has been appropriately 

fi xed to the support base.

3.  Minimum clearance spaces have 

been observed.

4.  Power supply cables are correct-

ly sized and capable of suppor-

ting the electrical requirements of 

the unit (see section on electrical 

data) and that the unit is correctly 

earthed.

5.  All electrical connections are co-

rrectly terminated and tightened.

8.2.2. CHECKS TO BE DONE 

WHEN POWERED UP

1.  Apply power to the unit by tur-

ning the main isolator to the ON 

position. The display will power 

up after several seconds after 

applying power, check that the 

operating status is on OFF (OFF 

BY KEYB on the lower part of the 

display).

2.  Check with a tester that the 

power supply voltages on the 

phases U-V-W are 400V ±10%, 

check that the phase imbalance 

is not greater than 3%.

3.  Check that the connections made 

by the installer comply with the 

documentation.

4.  Check that the compressor crank-

case heater(s) are operating by 

measuring the increase of oil 

sump temperature. The heater(s) 

must be in operation for at least 

12 hours before starting the com-

pressor, and in all cases the sump 

oil temperature must be 10-15 K 

above ambient temperature.

HYDRAULIC CIRCUIT

1.  Check that all hydraulic connec-

tions have been correctly insta-

lled, that the instructions on the 

labels have been followed, and 

that a mechanical fi lter has been 

installed on the inlet to the eva-

porator. (Mandatory component 

otherwise the warranty will be 

voided).

2.  Confi rm that the pump(s) are 

operating and that the fl ow rate 

is suffi cient to make the contact 

on the fl ow switch.

3.  Check  the water fl ow rate by 

measuring the differential pres-

sure across the evaporator inlet 

and outlet and calculating the 

fl ow from the evaporator pressu-

re drop diagram provided in the 

documentation.

4.  Check the correct functioning of 

any fl ow switch installed; close the 

isolating valve on the evaporator 

outlet and observe the result on the 

unit display panel; open the valve 

and reset the fl ow trip alarm.

WARNING

Before carrying out the following 

checks ensure the unit is discon-

nected from the power supply.

Ensure that the main isolator is 

in the OFF position and locked 

in that position with appropria-

te warning label attached. 

Before starting the procedures 

check for the absence of volta-

ge with a voltmeter or phase 

checker.

8.3. FIRST START-UP

After having rigorously followed the abo-

ve checks it is possible to start the unit:
1.  Close the electrical panel.
2.  Turn the main isolator to ON.
3.  Press the key ON     for 3 se-

conds to start the unit.

4.  Pressing the key ON      displays 

the water temperature and the 

operating mode of the unit.

5.  Check the operating setpoint pa-

rameters and reset any alarms 

present. After a few minutes the 

unit will start.

8.3.1. CHECKS WITH THE UNIT 

RUNNING 
REFRIGERANT CIRCUIT CHECK:

•  That  the  compress

or input current 

of the compressors is less than that 

indicated in the table of electrical 

data.

•  That  in  three  phase  models  the 

compressor noise is not abnormal, 

indicating a reverse rotation. In this 

case reverse one of the phases.

•  That the voltage values are within 

the determined limits and that the 

phase imbalance (three phase 

power) is less than 3%.

•  Presence of any refrigerant leaks, 

in particular from connections to 

gauges, pressure transducers and 

pressostats. (Vibrations during 

transportation may have loosened 

connections).

•  Superheat 

Compare the compressor suction 

temperature with a contact tempe-

rature sensor reading with the tem-

perature of the low pressure gauge 

(saturated

•  suction temperature corresponding 

to the evaporating pressure). The 

difference between these two tem-

peratures is the superheat value. 

The optimal values are between 4 

and 8 K.

•  Discharge temperature

  If the values of sub-cooling and 

superheat are normal the tempe-

rature measured in the discharge 

line from the compressor must be 

30/40 K above the condensing 

temperature.