Instructions
© Danfoss | DCS (CC) | 2021.03
4 | AN37261865152501-010101 - 118A2176A
designed for.
• 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 & R455A or R452A 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.
10 – Verification before commissioning
Use safety devices such as safety
pressure switch and mechanical
relief valve 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 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™ Slim pack 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
distance (refer coolselector2).
• Optyma™ Slim Pack condensing units suction/
discharge pressure 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 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 service valves are open
• 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 any 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
oil type as identified on the data plate of the unit
and compressor
• Recheck the compressor oil level again after 24
hours operation
• Carry out final leak test and ensure all covers are
fitted and all screws fastened
• Complete refrigerant labelling to comply with
local standard
• Ensure maintenance is carried out in accordance
with the installation instructions
13 – Maintenance
Always switch off the unit at main
switch before remove fan panel.
Internal pressure and surface
temperature are dangerous and
may cause permanent injury.
Maintenance operators and
installers require appropriate
PPEs, skills, tools to carryout the
maintenance activity. Tubing
temperature may exceed 100°C and
can cause severe burns.
Ensure that periodic service
inspections to ensure system
reliability and as required by local
regulations are performed.
To prevent system related problems, following
periodic maintenance is recommended:
• Verify that safety devices are operational and
properly set.
• Ensure that the system is leak tight.
• Check the compressor current draw.
• Confirm that the system is operating in a way
consistent with previous maintenance records
and ambient conditions.
• Check that all electrical connections are still
adequately fastened.
• Keep the unit clean and verify the absence of
rust and oxidation on the unit components,
tubes and electrical connections.
•
Micro channel heat exchanger surface
adequately cleaned to avoid clogging.
•
Timer setting are set at 30 seconds during
normal running condition.
•
Optyma™ Slim Pack condensing units are
factory fitted with flare type filter drier. While
changing the filter drier ensure that proper
model designation and direction of flow. Ensure
to conduct the leakage check after replacement.
The condenser must be checked at least once
a year for clogging and be cleaned if deemed
necessary. Access to the internal side of the
condenser takes place through the fan panel.
Microchannel coils tend to accumulate dirt on
the surface rather than inside, which makes them
easier to clean than fin-&-tube coils.
•
Switch off the unit at main switch before
