5
FRCC.EI.019.A2.02 © Danfoss Commercial Compressors 06/12
Instructions
condition during operation.
• Never leave the illing cylinder connected to
the circuit.
9 – Setting the electronic controller
• The unit is equipped with an electronic control-
ler which is factory programmed with parame-
ters for use with the actual unit. Refer to Ma-
nual RS8GDxxx 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 (picture 3).
The electronic controller is factory preset for
operation with refrigerant R404A. If another re-
frigerant is used, the refrigerant setting must be
changed. Parameter r12 must be set to 0 before
(software main switch= of).
• Push the upper button for a couple of seconds.
The column with parameter codes appears.
• Push the upper or lower button to ind parame-
ter 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, 13 = User dei-
ned, 17 = R507, 19 = R404A, 20 = R407C.
• Push the middle button to conirm the selected
value.
10 – Verification before commissioning
Use safety devices such as safety pressure
switch and mechanical relief valve in com-
pliance with both generally and locally appli-
cable 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 maxi-
mum service pressure of any system component.
• Verify that all electrical connections are pro-
perly fastened and in compliance with local
regulations.
• When a crankcase heater is required, the unit
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 ope-
ration. The overload protection value can be
found in the wiring diagram in the unit front
door.
11 – Start-up
• Never start the unit when no refrigerant is
charged.
• All service valves must be in the open position.
• 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 re-
moved 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 com-
pressor can be detected by following pheno-
mena; the compressor doesn’t build up pres-
sure, 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 pres-
sure indication on the controller (or low pres-
sure gauge) shall show a declining pressure
and the high pressure indication (or high pres-
sure gauge) shall show an increasing pressure.
12 – Check with running unit
• Check the fan rotation direction. Air must low
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 conirm
that the oil level remains visible.
• Respect the operating limits.
• Check all tubes for abnormal vibration. Move-
ments 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 com-
pressor must be operating during this process.
• Do not overcharge the system.
• 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.
13 – Emergency running without controller
In case of controller failure, the condensing unit
can still be operated when the controller stan-
dard wiring (picture 4) is modiied into a tempo-
rary wiring (picture 5) as described below.
This modiication may be done by authorized
electricians only. Country legislations have to be
followed.
Disconnect the condensing unit from power
supply (turn hardware main switch of)
• Contact of Room Thermostat must be pos-
sible 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.
• H1, H2, H3 : 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.
• H4 : Remove wire U2 from fan speed control-
ler and connect it with wire 11 and 25.
• Remove wire 14 (crankcase heater) and
connect it to the compressor contactor termi-
nal 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).
14 – Maintenance
Always switch of the unit at main switch be-
fore 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.
• Conirm that the system is operating in a way
consistent with previous maintenance re-
cords 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. Mi-
crochannel coils tend to accumulate dirt on the
surface rather than inside, which makes them
easier to clean than in-&-tube coils.
• Switch of the unit at main switch before ope-
ning the fan door.
• Remove surface dirt, leaves, ibres, etc. with
