4
FRCC.EI.019.A2.02 © Danfoss Commercial Compressors 06/12
Instructions
1 – Introduction
These instructions pertain to Optyma Plus
condensing units OP-LPHM, OP-MPHM, OP-
MPUM and OP-MPGM used for refrigeration
systems. They provide necessary information re-
garding safety and proper usage of this product.
The condensing unit includes following:
• Microchannel heat exchanger
• Reciprocating or scroll compressor
• Receiver with stop valve
• Ball valves
• Sight glass
• High & low pressure switches
• Filter drier
• Electronic controller
• Main circuit breaker (Main switch with over-
load protection)
• Fan and compressor 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 inal place for installa-
tion.
• Handle the unit with care. The packaging al-
lows for the use of a forklift or pallet jack. Use
appropriate and safe lifting equipment..
• Store and transport the unit in an upright po-
sition.
• Store the unit between -35°C and 50°C.
• Don’t expose the packaging to rain or corro-
sive atmosphere.
• After unpacking, check that the unit is com-
plete and undamaged.
3 – Installation precautions
Never place the unit in a lammable atmos-
phere
Place the unit in such a way that it is not bloc-
king or hindering walking areas, doors, windows
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
periods.
• 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 elimi-
nate vibrations and interference.
• The unit ambient temperature may not ex-
ceed 50°C during of-cycle.
• Ensure that the power supply corresponds to
the unit characteristics (see nameplate).
• When installing units for HFC refrigerants,
use equipment speciically reserved for HFC
refrigerants 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 com-
pressor must be lexible in 3 dimensions to
dampen vibrations. Furthermore piping has
to be done in such a way that oil return for the
compressor 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 EEC Pressure directive
(PED) nr. 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).
• It is possible to stack units on top of each
other.
Unit
Maximum
stacking
Housing 1
(Code no. 114X31-- or 114X41--)
3
Housing 2
(Code no. 114X32-- or 114X42--)
2
Housing 3
(Code no. 114X33-- or 114X43--)
2
Housing 4
(Code no. 114X34-- or 114X44--)
• When stacking, the topmost unit must be se-
cured to the wall, as shown in picture 2.
• 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
low.
• 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.
5 – Leak detection
Never pressurize the circuit with oxygen or
dry air. This could cause ire 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 of 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 accor-
ding 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 an electronic control-
ler. Refer to Manual RS8GDxxx for details.
• The unit is equipped with a main switch with
overload protection. The overload protec-
tion is factory preset but it is recommended
to check the value before taking the unit in
operation. The value for the overload protec-
tion 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
compressor installed in the unit.
For units with a 3-phase scroll compressor (OP-
MPUMxxxxxxxxE), 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
• Never start the compressor under vacuum.
Keep the compressor switched of.
• 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
and approx. 2 bar for R134a.
• The remaining charge is done until the instal-
lation has reached a level of stable nominal
