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Instructions

• Perform a leak detection test on the

complete system.

• The maximum test pressure is 32 bar.

• When a leak is discovered, repair the leak

and repeat the leak detection.

6 – Vacuum dehydration

• Never use the compressor to evacuate the

system.

• Connect a vacuum pump to both the LP &

HP sides.

• Pull down the system under a vacuum of

500 μm Hg (0.67 mbar) absolute.

• Do not use a megohmmeter nor apply

power to the compressor while it is under

vacuum as this may cause internal damage.

7 – Electrical connections

• Switch off and isolate the main power

supply.

• Ensure that power supply cannot be

switched on during installation.

• All

electrical

components

selected as per local standards and unit

requirements.

• Refer to wiring diagram for electrical

connections details.

• Ensure that the power supply corresponds

to the unit characteristics and that the

power supply is stable (nominal voltage

±10% and nominal frequency ±2,5 Hz).

• Dimension the power supply cables

according to unit data for voltage and

current.

• Protect the power supply and ensure

correct earthing.

• Make the power supply according to local

standards and legal requirements.

• The unit is equipped with high- and low-

pressure switches, which directly cut the

power supply to the compressor in case of

activation.

• For units with a 3-phase scroll compressor,

correct phase sequence for compressor

rotation direction shall be observed.

• Determine the phase sequence by using a

phase meter in order to establish the phase

orders of line phases L1, L2 and L3.

• Connect line phases L1, L2 and L3 to main

switch terminals T1, T2 and T3 respectively.

8 – Filling the system

• Wear protective stuff like goggles and

protective gloves.

• Never start the compressor under vacuum.

Keep the compressor switched off.

• Before charging the refrigerant, verify that

the oil level is between ¼ and ¾ on the

compressor oil sight glass. If additional oil

is required please refer to the compressors

label for type of oil.

• Use only the refrigerant for which the unit

is designed for.

• Fill the refrigerant in liquid phase into the

condenser or liquid receiver. Ensure a slow

charging of the system to 4 – 5 bar.

2 | AN343545366322-000101

• Do not put liquid refrigerant through

suction line.

• It is not allowed to mix additives with the

oil and/or refrigerant

• The remaining charge is done until the

installation has reached a level of stable

nominal condition during operation.

• Never leave the filling cylinder connected

to the circuit.

9 – Verification before commissioning

Use safety devices such as safety pressure

switch and mechanical relief valve in

compliance with both generally and locally

applicable regulations and safety standards.

Ensure that they are operational and

properly set.

Check that the settings of high-pressure

switches and relief valves don't exceed the

maximum service pressure of any system

component.

• Verify that all electrical connections are

must

properly fastened and in compliance with

local regulations.

• When a crankcase heater is required, it

must be energized at least 12 hours before

initial start- up and start-up after prolonged

shut-down period.

10 – Start-up

• Never start the unit when no refrigerant is

charged.

• All service valves must be in the open

position.

• Check compliance between unit and

power supply.

• Check that the crankcase heater is working.

• Check that the fan can rotate freely.

• Check that the protection sheet has been

removed from the backside of condenser.

• Balance the HP/LP pressure.

• Energize the unit. It must start promptly.

If the compressor does not start, check

wiring conformity, voltage on terminals

and sequence phase.

• Eventual reverse rotation of a 3-phase

compressor can be detected by following

phenomena; unit doesn't start, the

compressor doesn't build up pressure,

it has abnormally high sound level and

abnormally low power consumption. In

such case, shut down the unit immediately

and connect the phases to their proper

terminals.

• If the rotation direction is correct the low

pressure indication on the low pressure

gauge shall show a declining pressure and

the high pressure indication on the high

pressure gauge shall show an increasing

pressure.

11 – Check with running unit

• Check the fan rotation direction. Air must

flow from the condenser towards the fan.

• Check current draw and voltage.

• Check suction superheat to reduce risk of

slugging.

• When a sight glass is provided observe the

oil level at start and during operation to

confirm that the oil level remains visible.

• Respect the operating limits.

• Check all tubes for abnormal vibration.

Movements in excess of 1.5 mm require

corrective measures such as tube brackets.

• When needed, additional refrigerant in

liquid phase may be added in the low-

pressure side as far away as possible from

the compressor. The compressor must be

operating during this process.

• Do not overcharge the system.

• Never release refrigerant to atmosphere.

• Before leaving the installation site, carry

out a general installation inspection

regarding cleanliness, noise and leak

detection.

• Record type and amount of refrigerant

charge as well as operating conditions as a

reference for future inspections.

12 – Maintenance

Always switch off the unit at main switch

before remove fan panel.

Internal pressure and surface temperature

are dangerous and may cause permanent

injury. Maintenance operators and installers

require appropriate skills and tools. Tubing

temperature may exceed 100°C and can

cause severe burns.

Ensure that periodic service inspections to

ensure system reliability and as required by

local regulations are performed.

To prevent system related problems,

following

Periodic

maintenance

recommended:

• Verify that safety devices are operational

and properly set.

• Ensure that the system is leak tight.

• Check the compressor current draw.

• Confirm that the system is operating in a

way consistent with previous maintenance

records and ambient conditions.

• Check that all electrical connections are still

adequately fastened.

• Keep the unit clean and verify the absence of

rust and oxidation on the unit components,

tubes and electrical connections.

The condenser must be checked at least

once a year for clogging and be cleaned if

deemed necessary. Access to the internal

side of the condenser takes place through

the fan panel. Microchannel coils tend to

accumulate dirt on the surface rather than

inside, which makes them easier to clean

than fin-&-tube coils.

• Switch off the unit at main switch before

remove any panel from the condensing

unit.

• Remove surface dirt, leaves, fibers, etc. with

a vacuum cleaner, equipped with a brush

or other soft attachment. Alternatively,