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6 Preparation

Installer reference guide

RRLQ004~008CA + RHBH/X04+08CB

ROTEX HPSU low temperature Bi‑bloc

4P384979-1 – 2015.01

Outer diameter

(Ø)

Temper grade

Thickness (t)

(a)

6.4 mm (1/4")

Annealed (O)

≥0.8 mm

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

)

Insulation inner

diameter (Ø

)

Insulation thickness

(t)

6.4 mm (1/4")

8~10 mm

10 mm

15.9 mm (5/8")

16~20 mm

13 mm

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.

▪

Piping length.

It is recommended to avoid long runs of piping

between the domestic hot water tank and the hot water end point
(shower, bath,…) and to avoid dead ends.

▪

Piping diameter.

Select the water piping diameter in relation to

the required water flow and the available external static pressure
of the pump. See

"14 Technical data" on page 83

for the external

static pressure curves of the indoor unit.

▪

Water flow.

You can find the minimum required water flow for

indoor unit operation in the following table. In all cases, this flow
needs to be guaranteed. When the flow is lower, the indoor unit
will stop operation and display error 7H.

Minimum required flow rate during defrost/backup heater
operation

04+08 models

12 l/min

11+16 models

15 l/min

▪

Field supply components – Water.

Only use materials that are

compatible with water used in the system and with the materials
used in the indoor unit.

▪

Field supply components – Water pressure and temperature.

Check that all components in the field piping can withstand the
water pressure and water temperature.