Daikin EHYKOMB33AA2A [18/136] Preparing refrigerant piping
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Daikin EHYKOMB33AA2A [18/136] Preparing refrigerant piping

Daikin EHYKOMB33AA2A [18/136] Preparing refrigerant piping
6 Preparation
Installer reference guide
18
EVLQ05+08CAV3 + EHYHBH05AA + EHYHBH/X08AA +
EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1A – 2016.02
▪ Mind the measurement guidelines:
Maximum refrigerant piping length between indoor
unit and outdoor unit
20m
Minimum refrigerant piping length between indoor
unit and outdoor unit
3m
Maximum height difference between indoor unit and
outdoor unit
20m
Maximum equivalent piping length between the
3‑way valve and the indoor unit (for installations
with domestic hot water tank)
3m
(a)
Maximum equivalent piping length between the
domestic hot water tank and the indoor unit (for
installations with domestic hot water tank)
10m
(a)
(a) Piping diameter 0.75".
▪ Mind the following spacing installation guidelines:
>500
200
200
10 350 500
(mm)
Do NOT install the unit in places such as:
▪ In places where a mineral oil mist, spray or vapour may be
present in the atmosphere. Plastic parts may deteriorate and fall
off or cause water leakage.
▪ Sound sensitive areas (e.g. near a bedroom and the like), so that
the operation noise will cause no trouble.
▪ The foundation must be strong enough to bear the weight of the
unit. Take the weight of the unit with a domestic hot water tank full
of water into account.
Make sure, in the event of a water leak, water cannot cause any
damage to the installation space and surroundings.
▪ In places with high humidity (max. RH=85%), for example a
bathroom.
▪ In places where frost is possible. Ambient temperature around the
indoor unit should be >5°C.
▪ The indoor unit is designed for indoor installation only and for
ambient temperatures ranging 5~35°C in cooling mode and
5~30°C in heating mode.
6.3 Preparing refrigerant piping
6.3.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping diameter:
Liquid piping Ø6.4mm (1/4")
Gas piping Ø15.9mm (5/8")
▪ Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade Thickness (t)
(a)
6.4mm (1/4") Annealed (O) ≥0.8mm
t
Ø
15.9mm (5/8") Annealed (O) ≥1.0mm
(a) Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
6.3.2 Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052W/mK (0.035
and 0.045kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Pipe outer diameter
(Ø
p
)
Insulation inner
diameter (Ø
i
)
Insulation thickness
(t)
6.4mm (1/4") 8~10mm 10mm
15.9mm (5/8") 16~20mm 13mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher
than RH80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
6.4 Preparing water piping
6.4.1 Water circuit requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
▪ Connecting piping – Legislation. Make all piping connections in
accordance with the applicable legislation and the instructions in
the "Installation" chapter, respecting the water inlet and outlet.
▪ Connecting piping – Force. Do NOT use excessive force when
connecting the piping. Deformation of the piping can cause
malfunctioning of the unit.
▪ Connecting piping – Tools. Only use appropriate tooling to
handle brass, which is a soft material. If NOT, pipes will get
damaged.
▪ Connecting piping – Air, moisture, dust. If air, moisture or dust
gets into the circuit, problems may occur. To prevent this:
▪ Only use clean pipes
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall, to prevent
dust and/or particles entering the pipe.
▪ Use a decent thread sealant to seal connections.
▪ Closed circuit. Use the indoor unit ONLY in a closed water
system. Using the system in an open water system will lead to
excessive corrosion.
▪ Glycol. For safety reasons, it is NOT allowed to add any kind of
glycol to the water circuit.

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