About this document
If the safety valve is working, CO2 gas can concentrate inside the casing of the outdoor unit. After the refrigerant is fully charged, DO NOT turn off the operation switch and power supply of the outdoor unit.
Instructions for safe operation
DO NOT operate the unit until the service technician confirms that the leaking part has been repaired. To prevent any quality degradation, DO NOT use the unit to cool precision instruments or artwork.
Field piping pressure
Recommended maintenance and inspection
- To unpack the outdoor unit
- To handle the outdoor unit
- To remove the accessories from the outdoor unit
- Labels on outdoor unit
To avoid personal injury, DO NOT touch the unit's air intake or aluminum fins. Always use guards to prevent belt damage and be aware of the unit's center of gravity.
System layout
To cut off the spun pipe ends To cut off the spun pipe ends When the product is shipped, a. For safety reasons, it is necessary to release the coolant before cutting the threaded pipe ends.
Indoor unit constraints
Installation site requirements of the outdoor unit
Additional installation site requirements of the
Additional installation site requirements for CO₂
Install the unit ONLY in locations where the doors of the occupied space do NOT fit tightly. If the unit is installed indoors (eg in a machine room), ALWAYS use a portable CO2 detector. If not installed securely, the safety valve may cause damage to the pipes or the unit.
If the unit is installed indoors, ALWAYS install a CO2 detector according to the specifications of standard EN378.
Opening and closing the unit
To open the outdoor unit
To open the electrical component box of the outdoor
To close the outdoor unit
Mounting the outdoor unit
- To provide the installation structure
- To install the outdoor unit
- To remove the transportation stay
- To provide drainage
- Refrigerant piping requirements
- Refrigerant piping material
- Refrigerant piping length and height difference
- To select refrigerant branch kits
- To select expansion valves for refrigeration
If the unit is operated with the transport rod attached, abnormal vibrations or noise may occur. The compressor's transport strut, located in the middle compressor (INV2), protects the unit during transport. When outside temperatures are negative, the drained water from the outdoor unit will freeze.
If water drainage is not taken care of, the area around the unit can be very slippery. If it is desired to be able to close the shut-off valves for field pipes, the installer MUST install a pressure relief valve on the liquid pipe between the outdoor unit and the cooling indoor units. If the outdoor unit is installed higher than the cooling indoor unit, an oil trap must be installed in the gas pipe every 5 meters.
If the outdoor unit is installed lower than the cooling indoor unit, install the riser near the indoor unit. When the compressor of the outdoor unit starts, a correctly installed riser will prevent liquid from flowing back to the outdoor unit. The following nominal conditions are valid for the liquid pipes at the outlet of the outdoor unit.
Using stop valves and service ports
To handle the stop valve
To handle the service port
When installing the service port cap, apply screw lock compound or silicone sealant to the threads.
Tightening torques
Connecting the refrigerant piping
To cut off the spun pipe ends
To connect the refrigerant piping to the outdoor unit
Guidelines to connect T-joints
Guidelines to install a dryer
Guidelines to install a filter
About safety valves
To install safety valves
When the product is shipped, a small amount of refrigerant gas is kept in the product. Prerequisite: If you do not route the discharge pipe in the same way as the refrigerant pipe, remove the other knockout piece (in the small front plate or the bottom plate of the outdoor unit). 2 Solder the accessory safety valve pipe for front or bottom connection to the outdoor unit pipe.
4 Connect the safety valve piping to a fixed structure to avoid vibrations from breaking the pipe when the safety valve opens. 6 It is recommended to apply 20 wraps of PTFE tape to the thread of the threaded part. 7 It is recommended to screw the safety valve into the threaded piece and tighten it between 35 and 60 N•m.
The safety valve must be installed vertically so that water cannot enter the discharge hole.
About changeover valves
Safety valve reference information
Checking the refrigerant piping
Checking refrigerant piping: Setup
A Nitrogen (N2) B R744 refrigerant tank C Weighing scales D Vacuum pump E Outdoor unit a Pressure regulator b Filling hose c Gas side d Gas side e Liquid side. The connections to the indoor units and all the indoor units should also be leak and vacuum tested. Leakage testing and vacuum drying should be performed before setting the power supply to the unit.
To perform a strength pressure test and leak test
To perform vacuum drying
Insulating the refrigerant piping
To insulate the gas stop valve
3 Insulate the back of the stop valve by applying an insulating tape (supplied) around the fixing screws. The distance between high voltage and low voltage cables must be at least 50 mm. If the equipment is installed closer than 30 m from a residential place, the professional installer MUST evaluate the EMC situation before installation.
EN/IEC 61000‑3‑11 provided that the system impedance Zsys is less than or equal to Zmax at the interface point between the user's supply and the public system. EN/IEC European/International Technical Standard defining limits for voltage changes, voltage fluctuations and vibrations in public low-voltage supply systems for equipment with rated current ≤75 A. It is the responsibility of the installer or user of the equipment to ensure: consulting the distribution network operator if necessary, that the device is ONLY connected to a supply with a system impedance Zsys less than or equal to Zmax.
EN/IEC provided that the short-circuit power Ssc is greater than or equal to the minimum Ssc value at the interface point between the user's supply and the public system. EN/IEC European/International technical standard setting the limits for harmonic currents produced by equipment connected to public low-voltage systems with input current >16 A and ≤75 A per phase. It is the responsibility of the installer or user to ensure, after consultation with the distribution network operator if necessary, that the equipment is ONLY connected to a supply with a short-circuit power Ssc greater than or equal to the minimum Ssc value.
Field wiring: Overview
Guidelines when knocking out knockout holes
Guidelines when connecting the electrical wiring
Specifications of standard wiring components
Transmission wiring specification and limits(a) Use only harmonized wire which provides double insulation and is suitable. a) If the total transmission wiring exceeds these limits, communication errors may occur.
Connections to the outdoor unit
Low voltage wiring – Outdoor unit
High voltage wiring – Outdoor unit
To enable or disable quiet operation remotely, you must install a quiet switch. The outdoor unit is equipped with a terminal (X4M class II construction) that can send 4 different signals. P1/P2: operating signal – connection required – when the expansion valves of the connected display cases and fan coils are controlled.
The operation output P1/P2 of the outdoor unit MUST be connected to all expansion valves of the connected showcases and fan coils. This connection is required because the outdoor unit must be able to control the expansion valves during start-up (to prevent liquid refrigerant from entering the compressor and to prevent the safety valve on the low pressure side of the refrigeration cabinet from opening) . Check instead that the case or fan coil expansion valve can ONLY open when the P1/P2 signal is ON.
Connections to the capacity up unit
Low voltage wiring – Capacity up unit
High voltage wiring – Capacity up unit
The outdoor unit is equipped with a terminal (X2M class II construction) that can send out 3 different signals. The fan will continue to rotate for a while even after the power switch is turned off. When the triple point is reached (5.2 bar absolute pressure or 4.2 bar gauge pressure), you can continue charging with R744 in liquid state.
If the power of some units is turned off, the charging process cannot be completed properly. Only when charging the unit for the first time, turn the power ON 6 hours before operation to power the case heater and protect the compressor. Without the front panel attached, the unit cannot properly judge whether it is working properly or not.
In case of maintenance and the system (outdoor unit+field pipes+indoor units) contains no more refrigerant (e.g. after refrigerant recycling), the unit must be filled with its original amount of refrigerant and the set additional refrigerant amount. DO NOT completely close the field pipe shut-off valve after the refrigerant has been filled into the unit. Furthermore, keep a constant connection between the safety valve and the field fluid pipe to prevent the pipe from bursting (if pressure builds up too much).
To determine the refrigerant amount
To charge refrigerant
- About making field settings
- To access the field setting components
- Field setting components
- To access mode 1 or 2
- To access field setting [2-21]
If the local piping length is long, the outdoor unit will automatically stop when refrigerant is added while the liquid stop valve is fully closed. After charging refrigerant, keep the power supply and operation switch of the outdoor unit ON to prevent pressure increase on the low pressure side (suction pipe) and pressure increase on the pressure side of the liquid receiver. After charging, add the total amount of refrigerant to the rating plate on the front panel of the unit.
To configure the outdoor unit and the capacity unit, you need to provide input to the main PCB (A1P) of the outdoor unit and the capacity unit. Use DS2 to define a system layout with or without Capacity up unit. a)If there is no physical connection to the Capacity Up unit, an error code will be displayed on the outdoor unit. Turn ON power 6 hours before use to allow power to the crankcase heater and protect the compressor.
Turn on the power supply of the outdoor unit, capacity increase unit and all indoor units. If you get confused in the middle of the process, press BS1 to return to the default situation. When you perform the test operation, NOT ONLY the outdoor unit but also the connected indoor unit will work.
Checklist before commissioning
Make sure that the preparations of all indoor units are complete (field pipes, electrical wiring, air purification,.
About the test run
If a capacity up unit is installed, its test run must AFTER the test run of the outdoor unit.
To perform a test run (7-segment display)
Test run checks
Subcool: 27 times To return to the initial state, for example if you pushed the wrong number of times, press BS1 once.
Correcting after abnormal completion of the test run
Logbook
Error codes: Overview
Check the upstream communication cable connection between the capacity unit and the outdoor unit. After turning on the operation switch, wait at least 1 minute before turning the power OFF. A subset of the latest technical data is available on the regional Daikin website (publicly available).
The complete set of latest technical data is available on the Daikin Business Portal (authentication required).
Piping diagram: Capacity up unit
Wiring diagram: Outdoor unit
