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Instructions
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 and WD2) is modified into a tempora-
ry wiring (WD3 and WD4 respectively) as described
below.
• Contact of Room Thermostat must be possible to
switch 250VAC.
• For OP-MPPM028-035-044 models
- Remove wire 22 (safety input DI3) and wire 6
(fan supply) and put them together. A fan pres-
sure switch (e.g. KP5) or a fan speed controller
(e.g. XGE) can be connected in series to wire 6
• OP-MPPM065 model
- Remove wire from controller terminal 22 (safety
input) and controller terminal 16 (fan relay) and
put them together
- Remove the wire from terminal 4 to controller
terminal 55. Remove the wire from terminal 5 to
controller terminal 54. Connect Terminal 4 and
Terminal 5
- Remove the wire from terminal 5 to EC-Fan Gnd
terminal. Connect Terminal 5 to EC-Fan 10VDC
terminal
• 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 | 2024.06
• Adjust the potentiometer to get the desired
speed.
• Replace the controller as soon as possible.
15 – Maintenance
Always switch off the unit at main
switch and wait 4 minutes (capacitor
discharge time) before opening the
fan door (s) to avoid electric shock.
Even when main switch is OFF vol-
tage is available on the income ter-
minals of main switch and this should
be considered during maintenance
and service.
Internal pressure and surface tempe-
rature are dangerous and may cause
permanent injury.Maintenance ope-
rators and installers require appro-
priate skills and tools. Tubing tem-
perature may exceed 100°C and can
cause severe burns.
Ensure that periodic service inspec-
tions to ensure system reliability and
as required by local regulations are
performed.
To prevent system related problems, following pe-
riodic 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 ade-
quately 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 neces-
sary. 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.
If the refrigerant system has been opened, the sys-
tem has to be flushed with dry air or nitrogen to
remove moisture and a new filter drier has to be ins-
talled. If evacuation of refrigerant has to be
done, it shall be done in such a way that no
refrigerant can escape to the environment.
Fig A: Fully opened condition, Port 2 and 3 is fully
opened and port 4 is fully closed
Fig B: Fully closed condition, Port 3 and 4 is partially
open and port 2 is fully closed
Fig C: Partially Opened Condition (5.5 turns clock
wise from fully opened condition. Port 2, 3, 4 is fully
opened).
16 - Warranty
Always transmit the model number and serial nu-
mber with any claim filed regarding this product.
The product warranty may be void in following
cases:
• Absence of nameplate.
• External modifications; in particular, drilling, wel-
ding, broken feet and shock marks.
• Compressor opened or returned unsealed.
• Rust, water or leak detection dye inside the com-
pressor.
• Use of a refrigerant or lubricant not approved by
Danfoss.
• Any deviation from recommended instructions
pertaining to installation, application or mainte-
nance.
• Use in mobile applications.
• Use in explosive atmospheric environment.
• No model number or serial number transmitted
with the warranty claim.
17 – Disposal
Danfoss recommends that condensing units and
oil should be recycled by a suitable company at its
site.
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