Instructions
4 | © Danfoss | DCS (CC) | 2018.06
FRCC.PI.041.A4.02
1 – Introduction
These instruction pertain to Optyma
™
Plus
condensing units OP-MPLM, OP-MPPM used for
refrigeration systems. They provide necessary in-
formation regarding safety and proper usage of
this product.
The condensing unit includes following:
• Microchannel heat exchanger
• Variable speed scroll compressor
• Receiver with stop valve
• Oil separator
• Ball valves
• Sight glass
• High & low pressure switches
• Filter drier
• Electronic controller
• Compressor drive with EMC filter
• Main circuit breaker (Main switch with overload
protection)
• Fan capacitors
• Compressor contactor
• Robust weather proof housing
2 – Handling and storage
• It is recommended not to open the packaging
before the unit is at the final place for installa-
tion.
• Handle the unit with care. The packaging allows
for the use of a forklift or pallet jack. Use appro-
priate and safe lifting equipment..
• Store and transport the unit in an upright posi-
tion.
• Store the unit between -35°C and 50°C.
• Don’t expose the packaging to rain or corrosive
atmosphere.
• After unpacking, check that the unit is com-
plete and undamaged.
3 – Installation precautions
Never place the unit in a flammable atmos-
phere
Place the unit in such a way that it is not
blocking or hindering walking areas, doors, win-
dows or similar.
• Ensure adequate space around the unit for air
circulation and to open doors. Refer to picture
1 for minimal values of distance to walls.
• Avoid installing the unit in locations which are
daily exposed to direct sunshine for longer pe-
riods.
•
Avoid installing the unit in aggressive and
dusty environments.
• Ensure a foundation with horizontal surface
(less than 3° slope), strong and stable enough
to carry the entire unit weight and to eliminate
vibrations and interference.
• The unit ambient temperature may not exceed
50°C during off-cycle.
• Ensure that the power supply corresponds to
the unit characteristics (see nameplate).
• When installing units for HFC refrigerants, use
equipment specifically reserved for HFC refri-
gerants which was never used for CFC or HCFC
refrigerants.
• Use clean and dehydrated refrigeration-grade
copper tubes and silver alloy brazing material.
• Use clean and dehydrated system components.
• The suction piping connected to the compres-
sor must be flexible in 3 dimensions to dampen
vibrations. Furthermore piping has to be done
in such a way that oil return for the compres-
sor is ensured and the risk of liquid slug over in
compressor is eliminated.
4 – Installation
• The installation in which the condensing unit is
installed must comply to EC Pressure directive
(PED) no. 97/23/EC. The condensing unit itself is
not a ”unit” in the scope this directive.
• It is recommended to install the unit on rubber
grommets or vibration dampers (not supplied).
• 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
technique 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 in-
sulation.
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 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 sys-
tem.
• 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 sup-
ply is stable (nominal voltage ±10% and nomi-
nal 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.
•
The earth leakage current exceeds 3.5mA.
DC current can be supplied to the protective
conductor. Where a residual current device
(RCD) is used for protection in case of direct or
indirect contact, only a RCD of Type B is allowed
on the supply side of this product.
• Make the power supply according to local stan-
dards and legal requirements.
• For IT power supply systems open the RFI swit-
ch by removing the RFI screw on the left side of
the frequency converter (see Quick Guide MG-
18Mxxx §1.2.3).
• The unit is equipped with an electronic control-
ler. Refer to Manual RS8GDxxx for details.
• The unit is equipped with a main switch with
overload protection. The overload protection is
factory preset but it is recommended to check
the value before taking the unit in operation.
The value for the overload protection can be
found in the wiring diagram in the front door of
the unit.
• The unit is equipped with high and low pres-
sure switches, which directly cut the power
supply to the compressor in case of activation.
Parameters for high and low pressure cut outs
are preset in the controller, adapted to the com-
pressor installed in the unit.
• The Unit is equipped with compressor drive for
speed regulation. It is mandatory to connect
compressor via it’s drive as it is shown on the WD
of this instruction.
Correct phase sequence for compressor rotation
direction shall be observed.
• correct compressor supply phase sequence is
assured from the frequency converter and fac-
tory wiring
•
connections from frequency converter to
compressor terminals are shown in the wiring
diagram
8 – Filling the system
•
Never start the compressor under vacuum.
Keep the compressor switched off.
• Use only the refrigerant for which the unit is de-
signed for.
• Fill the refrigerant in liquid phase into the
condenser or liquid receiver. Ensure a slow
charging of the system to 4 – 5 bar.
• The remaining charge is done until the instal-
lation has reached a level of stable nominal
condition during operation.
• The charge must be as closed as possible to
the nominal system charge to avoid low pres-
sure operation and excessive superheat. For
VLZ028-044, the refrigerant charge limit is
3.6kg.Above this limit; protect the compressor
against liquid flood-back with a pump-down cy-
cle not lower than 2.3 bar (g) for R448A/R449A/
2.3 bar(g) for R407F / 2.3 bar(g) for R407A /
2.3 bar(g) for R404A / or a suction line accumu-
lator.
• Never leave the filling cylinder connected to
the circuit.
9 – Setting the electronic controller
• The unit is equipped with an electronic control-
ler which is factory programmed with parame-
ters for use with the actual unit. Refer to Manual
RS8GDxxx for details.
•
By default, the electronic controller display
shows the temperature value for the suction
pressure in °C. To show the temperature value for
the condensing pressure, push the lower button
(picture 2).
