Instructions
© Danfoss | Climate Solutions | 2022.02
4 | AN37261865152501-010301 - 118A2176C
Do not use any Hand tools to modify
the Potentiometer setting. This
operation must be done by Hands
with proper PPE.
Do not rotate this Potentiometer
setting screw in Counter-clockwise
direction. This can potentially
reduce the fan speed, risking the
performance and compressor safety
8 – Safety
Electrical box door should be in
closed condition before connecting to
power supply.
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.
Units will be with 3/8" NPT adapter plug. 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.
• As per EU F-gas regulation, R1234yf, R454C &
R455A are considered as A2L refrigerant. Optyma™
Slim Pack units are qualified with R1234yf, R454C
& R455A. All precaution and safety measure to be
taken care before and after installation.
• All Optyma™ Slim pack condensing units are
supplied with adjustable dual pressure switch
(KP-17WB) with maximum 0.5A current rating.
• In order to avoid electric arc between hermetic
connector pins, compressor must not start or
electrical tests such dielectric strength must not
be performed while the refrigerating system
under vacuum.
• All components should be compatible to use with
specified refrigerants according to Optyma™ Slim
Pack condensing units codes .Refer Annex A.
• Optyma™ Slim Pack condensing units have pre
ventilation via condenser fan prior to compressor
starting (30 seconds). Never disconnect or modify
timer settings.
• Beware of hot and extremely cold components.
• Beware of moving components. Power supply
should be disconnected while servicing.
•
Danfoss always recommend to main IP54
electrical box. In case of any damage to rubber
gasket, customer should replace immediately.
• Compressor has Internal overload protector (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
• Before filling the refrigerant into the Optyma™
Slim Pack condensing unit wear appropriate
Personal Protective Equipment (PPE).
• Never start the compressor under vacuum. Keep
the compressor switched off.
• If additional oil is required please refer to the
compressors label for type of oil. Check the
Compressor application guideline for minimum
oil level limit before refilling.
• Use only the refrigerant for which the unit is
designed for. Check unit name plate for more
details.
•
For glide refrigerants such as R454C, R455A,
R448A, R449A, R452A use liquid valve in the
refrigerant cylinder to charge.
•
Fill the refrigerant in liquid phase into the
condenser or liquid receiver. Ensure a slow
charging of the system to 4 – 5 bar for R448A,
R449A, R452A, R407A, R407F, R507, R404A, ,
R454C or R455A and approx. 2 bar for R134a,
R513A. R1234yf.
• 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.
• When charging A2L refrigerant make sure that
the charging area is well ventilated
• The Liquid receiver is fitted with Rotolock Valve
for service purpose. As a factory setting, the
valve will be in completely OPEN position. During
maintenance and Pump down, the Valve must
be Rotated in Clockwise direction until it is in
completely CLOSED position.
•
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 (not supplied) in
compliance with both International
and local 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 properly
fastened and in compliance with international
and 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.
•
Crankcase heater must be firmly fixed with
compressor shell. Ensure that it does not fall
down.
• Electrical panel door must be firmly closed using
the knob in door panel. For W09 version only, the
front door of the Electrical box is fastened by 4
screws on each corners.
•
All interconnecting tubes with (liquid and
suction) Optyma™ Slim pack condensing unit
must be sized properly depending upon the
evaporator location.
• Pressure drop in the suction and liquid line pipes
must be evaluated as per evaporator location
and distance (refer coolselector2).
• Optyma™ Slim Pack condensing units suction/
discharge pressure and temperatures must be
within the operating envelope, never operate
condensing unit suction pressure below absolute
pressure (vacuum).
11 – Start-up
•
Never start the unit when no refrigerant is
charged.
• 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
removed from the backside of condenser.
• Balance the HP/LP pressure.
•
Energize the unit. Condenser fan must start
promptly and after 30 seconds of time delay the
compressor starts (pre ventilation).
• If the fan motor 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.
• Ensure you have read the installation guideline
that is delivered with the condensing unit
• Only use the correct refrigerant(s) as detailed on
the data plate
• Check compressor oil level
• Check all mechanical connections are tight
• Check all electrical overload settings are correct
(See Annex D - Wiring Drawing).
12 – Check with running unit
• Check the fan rotation direction. Air must flow
from the condenser towards the fan.
• Check current drawn and voltage.
• Check suction superheat to reduce risk of liquid
slugging.
• For glide refrigerants use temperature difference
between saturated dew point at suction pressure
and Suction line temperature on the tube.
•
When a compressor 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.
•
Optyma™ Slim Pack condensing units are
designed to operate up to 43°C. During normal
operation or peak operation, saturated dew
point condensing temperature not to exceed
corresponding to 63 °C for R448A, R449A, R452A,
R454C, R455A. Saturated dew point condensing
temperature not to exceed corresponding to
65 °C for R134a, R513A & R1234yf.
• Check all interconnecting tubes are free from
abnormal vibrations. If in case of excess vibrations,
require corrective measures such as supporting
brackets, clamps.
•
When needed, additional refrigerant in liquid
phase may be added in the low-pressure side
as slow and far away as possible from the
compressor. The compressor must be operating
during this process.
• Do not overcharge the system.
• Follow the local regulations for restoring the
refrigerant from unit.
• Never release refrigerant to free 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.
• Check refrigerant charge and running currents of
motors to ensure correct operation
• Check compressor suction superheat to reduce
risk of liquid slugging
• Allow the system to run for 3 – 4 hours. Check
compressor oil level and top up with the correct
