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Instructions
• Ensure refrigerant is released safely to the
atmosphere directly.
• Incase of hazard,
additional spare kit has
been designed in order to collect the released
refrigerant. Kit should be installation with
proper piping routing
for discharge of
refrigerant safely. (See picture below)
• PRV should not be installed on service valve.
• Replace PRV after clean out of system or bared
out.
• No Detachable joints and valves should not
accessible to public. All brazing joints should
comply with EN 14276-2 and other permanent
joints should comply with EN-16084.
4 – Installation
• The installation in which the condensing unit is
installed must comply to EEC Pressure directive
(PED) no. 97/23/EC. The condensing unit itself
is not a "unit" in the scope this directive.
• The unit must be securely installed on a stable
and rigid support, and fixed from the begin-
ning. See picture 2.
• It is recommended to install the unit on rub-
ber grommets or vibration dampers (not sup-
plied).
• Slowly release the nitrogen holding charge
through the schrader port.
• Connect the unit to the system as soon as pos-
sible to avoid oil contamination from ambient
moisture.
• Avoid material entering into the system while
cutting tubes. Never drill holes where burrs
cannot be removed.
• Braze with great care using state-of-the-art tech-
nique and vent piping with nitrogen gas flow.
• Connect the required safety and control de-
vices. When the schrader port is used for this,
remove the internal valve.
• It is recommended to insulate the suction pipe
up to the compressor inlet with 19 mm thick
insulation.
• Copper piping material should comply with
EN12735-1. And all pipe joints should comply
with EN14276-2
• At filed installation, support to added according
to size and weight. Recommended maximum
spacing for pipe support as per EN12735-1 &
EN12735-2
• Connecting pipes shall be made before
opening the valves to permit refrigerant to flow
between the refrigerating system parts.
5 – Leak detection
Never pressurize the circuit with
oxygen or dry air. This could cause
fire or explosion.
• Do not use dye for leak detection.
• Perform a leak detection test on the complete
system.
• The maximum test pressure is 31*
• When a leak is discovered, repair the leak and
repeat the leak detection.
*
)
25 bar for OP-.......AJ.... & OP-.......FH.... models
© Danfoss | Climate Solutions | 2022.08
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 can not be switched
on during installation.
• All electrical components must be selected as
per local standards and unit requirements.
• Refer to wiring diagram for electrical connec-
tions 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 stan-
dards and legal requirements.
• The unit is equipped with high and low pressure
switches, which directly cut the power sup-
ply to the compressor and provides 230V a.c.
alarm signals (max. 50VA) in case of activation.
Parameters for high and low pressure cut outs
should be set by installer considering compres-
sor model, refrigerant and application. Units
with Danfoss MLZ and LLZ compressors are also
equipped with phase sequence relay to protect
the unit against phase loss/sequence/ asym-
metry and under-/over-voltage.
For units with a 3-phase scroll compressor, cor-
rect 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 swit-
ch terminals T1, T2 and T3 respectively.
8 – Safety
Discharge tube temperature will
go upto 120°C during unit running
condition.
Recommended to install PRV inside
unit and release of refrigerant should
routed to atmosphere directly.
Fusible Plug is not available in unit, it is
replaced with adapter plug.
Unit has liquid receiver with an Adapter Plug
with 3/8" NPT connection. installer/end user can
select various options as mentioned in EN378-2 :
2016 Article § 6.2.2.3
• The unit/installation into which the condensing
unit is mounted/integrated, must be in
accordance with the PED.
• Beware of hot and extremely cold components.
• Beware of moving components. Power supply
should be disconnected while servicing.
• Compressor has Internal overload protector
)
bar.
(OLP). Its will protect compressor pressure
going beyond 32 bar pressure.
• No valves and detachable joints shall be located
in areas accessible to the general public except
when they comply with EN 16084
• Refrigerant piping shall be protected or
enclosed to avoid damage.
• Field piping should be installed such that it will
be free from corrosive or salty environment to
avoid corrosion in copper /Aluminum piping.
• In case of fire incidence, pressure increases due
to increasing in temperature at receiver. Hence
it is very important to install the PRV.
9 – Filling the system
• Wear protective stuff like goggles and protec-
tive 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 for R404A
/ R507A/R407A/R407F/R448A/R449A or R452A
and approx. 2 bar for R134a/R513A.
• 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 instal-
lation has reached a level of stable nominal
condition during operation.
• Never leave the filling cylinder connected to
the circuit.
• Suction, Liquid valves and Receiver Rotolock
valves as Schrader port for service operation
like Gas Charging, pressure measurement.
10 – 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-pres-
sure switches and relief valves don't
exceed the maximum service pres-
sure of any system component.
• Verify that all electrical connections are 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.
• Pressure drop in the suction and liquid line
pipes must be evaluated as per evaporator
location and distance (refer coolselector2).
11 – Start-up
• Never start the unit when no refrigerant is char-
ged.
• All service valves must be in the open position.
See picture 3.
• 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 re-
moved from the backside of condenser.
• Balance the HP/LP pressure.
118A5381B - AN40143613378401-010201 | 3
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