Danfoss Optyma Plus OP-LPQM Manual page 4

Instructions
must be energized at least 12 hours before
initial start-up and start-up after prolonged
shutdown for belt type crankcase heaters.
• The unit is equipped with a main switch with
overload 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.
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. It must start promptly. If
the compressor does not start, check wiring
conformity and voltage on terminals.
• 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. P05
models are equipped with a phase-reversal
relay and compressor doesn't start, the
compressor doesn't build up pressure, in case
of wrong phase sequences. 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.
13 – Check with running unit
• Check the fan rotation direction. Air must flow
from the condenser towards the fan.
• Check current draw and voltage.
• Check suction superheat to reduce risk of
slugging.
• When a 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.
• 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
4 | AN363632996019en-ZA0101 - 118A2221A
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.
• Follow the local regulations for restoring the
refrigerant from unit.
• Never release refrigerant to 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.
14 – Emergency running without controller
In case of controller failure, the condensing unit
can still be operated when the controller standard
wiring (picture 4) is modified into a temporary
wiring (picture 5) as described below.
This modification may be done by authorized
electricians only. Country legislations have to be
followed.
Disconnect the condensing unit from power
supply (turn hardware main switch off )
• Contact of Room Thermostat must be possible
to switch 250VAC.
• Remove wire 22 (safety input DI3) and wire 24
(room thermostat DI1) and put them together
with an insulated 250 Vac 10mm² terminal
bridge.
• Remove wire 25 (room thermostat DI1) and
wire 11 (compressor supply) and put them
together with an insulated 250VAC 10mm²
terminal bridge.
• Remove wire 6 and connect it with terminal
bridge for wire 11 and 25. A fan pressure switch
or fan speed controller can be connected in
series to wire 6.
• Remove wire 14 (crankcase heater) and connect
it to the compressor contactor terminal 22.
• Remove wire 12 (supply crankcase heater),
extend this wire by using an 250 Vac 10mm²
terminal bridge and 1,0mm² brown cable and
connect it to compressor contactor terminal 21
• Remove the large terminal block from the
controller terminals 10 to 19.
• Connect the condensing unit to power supply
(turn hardware main switch on).
15 – Maintenance
Always switch off the unit at main switch
before opening the fan door (s).
Internal pressure and surface temperature
are dangerous and may cause permanent injury.
Maintenance operators and installers require
appropriate skills and tools. 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.
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 door.
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
opening the fan door.
• Remove surface dirt, leaves, fibres, etc. with
a vacuum cleaner, equipped with a brush or
other soft attachment. Alternatively, blow
compressed air through the coil from the inside
out, and brush with a soft bristle. Do not use
a wire brush. Do not impact or scrape the coil
with the vacuum tube or air nozzle.
• Before closing the fan door, turn the fan blade
in a safe position, to avoid that the door hits the
fan.
If the refrigerant system has been opened, the
system has to be flushed with dry air or nitrogen
to remove moisture and a new filter drier has to
be installed. If evacuation of refrigerant has to
be done, it shall be done in such a way that no
refrigerant can escape to the environment.
16 – Declaration of incorporation
• Pressure Equipment Directive 2014/68/EU
EN 378-2:2016 - Refrigerating systems and Heat
Pumps - Safety and environmental requirements-
Parts 2: Design, construction, testing, marking
and documentation.
Low Voltage Directive 2014/35/EU
60335-1:2012 + A11:2014- Household and
similar electrical appliances-Safety-Part
General requirements-for all above mentioned
condensing units Eco-design
2009/125/ EC, establishing a framework for the
setting of Eco-design requirements for energy-
related products.
REGULATION (EU) 2015/1095, implementing Eco-
design Directive 2009/125/EC with regard to Eco-
design requirements for professional refrigerated
storage cabinets, blast cabinets, condensing units
and process Chiller.
• Condensing unit measurements are made
according to standard "EN
© Danfoss | DCS (CC) | 2020.12
EN
1:
DIRECTIVE
13771-2:2017"