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Instructions
• Never leave the filling cylinder connected to the
circuit.
• Suction, Liquid valves and Receiver Rotolock
valves as Schrader port for service operation like
Gas Charging, pressure measurement.
10 – 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 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 conden-
sing pressure, push the lower button (picture 2).
The electronic controller is factory preset for opera-
tion with refrigerant R449A. If another refrigerant is
used, the refrigerant setting must be changed. Pa-
rameter r12 must be set to 0 before (software main
switch= off).
• Push the upper button for a couple of seconds.
The first parameter code appears.
• Push the upper or lower button to find parameter
code o30.
• Push the middle button until the value for this pa-
rameter is shown.
• Push the upper or lower button to select the
new value: 17 = R507A, 19 = R404A, 21=R407A,
37=R407F, 40= R448A, 41= R449A.
• Push the middle button to confirm the selected
value.
• Go back to parameter r12 and change it to 1.
• If necessary change also parameter r23 to desired
suction pressure (°C/°F).
• Change parameter c33 for pump down value ac-
cording your needs.
• Push the middle button, default maximum
discharge temperature is 125°C
• If customer want to increase the valve, push the
upper button to select the new value: 130 push
middle button to confirm the selected value.
• Maximum allowable discharge temperature (r84)
should not exceed 130 °C
11 – Verification before commissioning
Use safety devices such as safety
pressure switch and mechanical re-
lief valve in compliance with both
generally and locally applicable regu-
lations and safety standards. Ensure
that they are operational and proper-
ly set.
Check that the settings of high-pres-
sure 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 local regula-
tions.
• The crankcase heater must be energized at least
12 hours before initial start-up and start-up after
prolonged shutdown to remove refrigerant in
liquid phase from the compressor. Remove DI1
plug from the controller to avoid compressor
start and turn ON the main switch during this
period.
• The unit is equipped with a main switch with
overload protection. Overload protection is pre-
4 |AN18718642524203-000601 - 118A5499A
set 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 wi-
ring diagram in the unit front door.
• Suction, Liquid valves and Receiver Rotolock
valves as Schrader port for service operation like
Gas Charging, pressure measurement.
12 – 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 sup-
ply.
• Check that the crankcase heater is working.
• Check that the fan can rotate freely.
• Balance the HP/LP pressure.
• Energize the unit. It must start promptly. If the
compressor does not start, check wiring confor-
mity and voltage on terminals.
• Reverse rotation of the 3-phase compressor will
be detected from the controller and can be de-
tected by following phenomena; the compres-
sor 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 pres-
sure 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 slug-
ging.
• The optimum compressor suction superheat is
around 6K. The maximum allowed superheat is
30K.
Observe the oil level at start and during operation
to confirm that the oil level remains visible. Excess
foaming in oil sight glass indicates refrigerant on
the sump.
• Monitor the oil sight glass for 1 hour after
system equilibrium to ensure proper oil re-
turn to the compressor. This oil check has to
be done over the speed range to guarantee:
- a good oil return at low speed with minimum
gas velocity.
- a good oil management at high speed with
maximum oil carry over.
• 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 compressor
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 clean-
liness, noise and leak detection.
• Record type and amount of refrigerant charge
as well as operating conditions as a reference for
future inspections.
Compressor failure to build up pressure: Check all
bypass valves in the system to ensure that none of
these has been opened. Also check that all solenoid
valves are in their proper position.
• Abnormal running noise: Ensure the absence
of any liquid flood-back to the compressor by
means of measuring the return gas superheat
and compressor sump temperature. The sump
should be at least 6K above the saturated suc-
tion temperature under steady-state operating
conditions.
• The high-pressure switch trips out: Check
condenser operations (condenser cleanliness,
fan operation, water flow and water pressure
valve, water filter, etc.). If all these are OK, the
problem may be due to either refrigerant over-
charging or the presence of a noncondensable
(e.g. air, moisture) in the circuit.
• The low-pressure switch trips out: Check evapo-
rator operations (coil cleanliness, fan operations,
water flow, water filter, etc.), liquid refrigerant
flow and pressure drops (solenoid valve, filter
dryer, expansion valve, etc.), refrigerant charge.
• Low refrigerant charge: The correct refrigerant
charge is given by the liquid sight glass indica-
tion, the condenser delta T in relation to the re-
frigerant pressure tables (pressuretemperature),
the superheat and the subcooling, etc. (if additio-
nal charge is deemed necessary, refer to section
9).
14 – Emergency running without controller
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 )
In case of controller failure, the condensing unit
can still be operated when the controller standard
wiring (WD1) is modified into a temporary wiring
(WD2) as described below.
• Contact of Room Thermostat must be possible to
switch 250VAC.
• Remove wire 22 (safety input DI3) and wire 6 (fan
supply) and put them together. A fan pressure
switch (e.g. KP5) or a fan speed controller (e.g.
XGE) can be connected in series to wire 6
• Remove wire 10 (drive start) and wire 24 (room
thermostat) and put them together
• Remove wire 11 (drive start) and wire 25 (room
thermostat) and put them together
• Remove wire 53 and 55 from drive terminals
and connect a 10kOhm potentiometer as below:
wire 1 to drive terminal 55
wire 2 to drive terminal 53
wire 3 to drive terminal 50
• Turn the knob of the potentiometer to middle
position, which corresponds approximately com-
pressor speed 50rps
• 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).
© Danfoss | Climate Solutions | 2022.03
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