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Instructions
oil level limit before refilling.
• 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 R404A/
R507,R407A,R407F,R448A/R449A,R452A,
R454C, R455A and approx. 2 bar for R134a,
R513A & R1234yf.
• 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.
• Do not put liquid refrigerant through suction
line.
• It is not allowed to mix additives with the oil
and/or refrigerant.
• When charging A2L refrigerant make sure that
the charging area is well ventilated.
10 – Setting the electronic controller
Change
controller
o37 to 1 in case of SPPR (Supply
monitoring relay) retrofit. In case
you add the SPPR option to protect
the compressor please change the
setting o37 from 0 to 1
• The unit is equipped with an electronic
controller which is factory programmed with
parameters for use with the actual unit. Refer to
Manual 118U3808 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 Annex A; Picture 3.
• Remove
controller
terminal
thermostat input) to avoid any unwanted
compressor start. Put it back after settings been
done.
The electronic controller is factory preset for
R404A / R449A / R452A / R134a / R454C / R1234yf
depending on the model of compressor mounted
and application (Refer Optyma™ Controller
installation manual 118U3808). If another
refrigerant is used, the refrigerant setting must be
changed.
• Push the upper button for a couple of seconds.
The column with parameter codes appears.
• Parameter r12 must be set to 0 before (software
main switch= off ).
• Push the upper or lower button to find
parameter code o30.
• Push the middle button until the value for this
parameter is shown.
• Push the upper or lower button to select
the new value: 2 = R22. 3 = R134a.17 = R507.
19 = R404A. 20 = R407C. 21 = R407A. 36 =
R513A. 37 = R407F. 40 = R448A. 41 = R449A. 42
= R452A. 39 = R1234yf. 51 = R454C. 52 = R455A
• Push the middle button to confirm the selected
4 | AN37261897352601-010202 - 118A2177B
value.
• Push the upper or lower button to find parame-
ter code r84.
• Push the middle button until the value for this
parameter is shown as 125
• Push the upper button to select the new value:
130 push middle button to confirm the selected
value.
11 – Verification before commissioning
Use safety devices such as safety
pressure switch and mechanical
relief
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-
pressure switches and relief valves
don't exceed the maximum service
pressure of any system component.
• Verify that all electrical connections inside the
condensing unit are properly fastened as they
could have worked loose during transportation.
• When a crankcase heater is required, the unit
parameter
must be energized at least 12 hours before
initial start-up and start-up after prolonged
shutdown for belt type crankcase heaters.
• Crankcase heater must be firmly fixed with
compressor shell. Ensure that it does not fall
down and energizes in air.
• Electrical panel door must be firmly closed
using the knob in door panel.
• All interconnecting tubes with (liquid and
suction) Optyma™ Plus condensing unit
must be sized properly depending upon the
evaporator location.
• Pressure drop in the liquid line pipes must
be evaluated as per evaporator location and
DI1
(room
distance (refer coolselector2).
• Optyma™ Plus condensing units suction
/ discharge pressure must be within the
operating envelope, never operate condensing
unit suction pressure below absolute pressure
(vacuum).
• The unit is equipped with a main switch
with overload protection and short circuit
protection. Overload protection is preset from
factory, but it is recommended to check the
value before taking the unit in operation. The
overload protection value can be found in the
wiring diagram in the unit front door.
• Check if discharge temperature sensor is firm
and has proper contact with discharge pipe.
• Ensure that 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 that all service valves are open
• Ensure the high pressure transmitter is open to
the system
• Check all mechanical connections are tight
valve
(not
supplied)
in
• Check all electrical overload settings are correct
12 – Start-up
• Never start the unit when no refrigerant is
charged.
• All service valves must be in the open position.
• Rotalock valve on the receiver must be
turned 1 round to close direction to get the
right condensing pressure for the pressure
transmitter
• 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).
• Eventual reverse rotation of a 3-phase
compressor can be detected by following
phenomena; the compressor doesn't build up
pressure, it has abnormally high sound level
and abnormally low power consumption. In
such case, shut down the unit immediately and
connect the phases to their proper terminals.
• If the rotation direction is correct the low
pressure indication on the controller (or
low pressure gauge) shall show a declining
pressure and the high pressure indication (or
high pressure gauge) shall show an increasing
pressure (only during startup).
13 – 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
slugging.
• 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™ Plus condensing units are designed
to operate upto 43 degree Celsius. During
normal operation or peak operation saturated
dew point condensing temperature not to
exceed corresponding to 63 deg Celsius for
R404A/R507, R448A, R449A, R452A, R454C,
R455A. Saturated dew point condensing
temperature not to exceed corresponding to
65 deg Celsius for R134a, R513A & R1234yf.
• Check all tubes for abnormal vibration.
Movements in excess of 1.5 mm require
corrective measures such as tube brackets.
• When needed, additional refrigerant in liquid
phase may be added in the low-pressure side
as far as possible from the compressor. The
compressor must be operating during this
process.
• Do not overcharge the system.
© Danfoss | Climate Solutions | 2021.08
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