1 – Introduction
These instructions pertain to Optyma
TM
Slim
Pack condensing units OP-LPQE/MPVE/MPME
(R22, R404A, R507, R134a, R513A, R448A, R449A,
R452A) used for refrigeration systems. They
provide necessary information regarding safety
and proper usage of this product.
The condensing unit includes following:
• Scroll/reciprocating compressor
• Microchannel heat exchanger
• Dual pressure switches
• Service valves suction/ liquid
• Weather proof housing (IP 54)
• Filter drier
• Receiver with stop valve
• Sight glass
• Solenoid valve
• Phase sequence relay *
)
• Fully pre-wired electrical panel (including main
switch, compressors contactor, overload relay)
• Crankcase heater (OP-LPQE units in W04 and
W10 only)*
)
Fan speed controller (W10 only)
*
)
Refer version control for components details in
all versions
2 – Handling and storage
• It is recommended not to open the packaging
before the unit is at the final place for installation.
•
Handle the unit with care. The packaging
allows for the use of a forklift or pallet jack. Use
appropriate and safe lifting equipment.
• Store and transport the unit in an upright position.
• 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
complete and undamaged.
3 – Installation precautions
Do not braze as long the condensing unit is
under pressure.
Never place the unit in a flammable atmosphere
Place the unit in such a way that it is not blocking
or hindering walking areas, doors, windows or similar.
• Ensure adequate space around the unit for air
circulation and to open doors. Refer to picture1
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 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
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
compressor must be flexible 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) no. 2014/68/EU. The condensing unit itself
is not a ”unit” in the scope this directive. Under all
circumstances local safety regulations must be
fulfilled.
•
The unit must be securely installed on a
stable and rigid support, and fixed from the
beginning. See picture 2.
•
It is recommended to install the unit on
rubber grommets or vibration dampers .
Rubber pads with mounting bolts are supplied.
• Slowly release the nitrogen holding charge
through the schrader port.
• Connect the unit to the system as soon as possible
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
devices. 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 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 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 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
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 and provides 230V a.c. alarm
signals (max.50VA) in case of activation. Version
W04 is also equipped with phase sequence relay
to protect the unit against phase loss/sequence/
asymmetry and under-/over-voltage.
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.
DGT protection is required if the high and
low pressure switch settings do not protect
the compressor against operations beyond its
specific application envelope. Please refer to
the examples below, which illustrate where DGT
protection is required (n°1) and where it is not
(n°2).
The compressor must not be allowed to cycle
on the discharge gas thermostat. Continuous
operations beyond the compressor’s operating
range will cause serious damage to the
compressor!
Discharge line
Thermostat
Bracket
Insulation
A DGT accessory is available from Danfoss: refer
to section “Spare parts & accessories”.
8 – Safety
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
Picture 2
Mounting bolts
Picture 3
Anticlockwise (open)
Clockwise (Close)
Schrader valve
Instructions
2 | AN238286441930en-001401 - 118A0665C
© Danfoss | DCS (CC) | 2020.06
