6 Installation
Installer reference guide
15
07C2V3
ROTEX HPSU monobloc compact outdoor unit
4P501827-1 – 2017.08
drain the side of the circuit on which they are located. To be able to
only drain the unit, make sure the drain valves are positioned
between the shut‑off valves and the unit.
a
b
a
Water inlet
b
Water outlet
1
Screw the outdoor unit nuts on the shut-off valves.
2
Connect the field piping on the shut-off valves.
3
For how to connect the HPSU monobloc tank, see the
installation manual of the tank.
NOTICE
To protect the water circuit against freezing, add glycol.
For instructions, see the installation manual of the HPSU
monobloc tank.
NOTICE
Install a manometer in the system.
NOTICE
Install air purge valves at all local high points.
6.4.4
To insulate the water piping
The piping in the complete water circuit MUST be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity.
To prevent the freezing of the outdoor water piping during winter
time, the thickness of the sealing material MUST be at least 13 mm
(with λ=0.039 W/mK).
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.
During winter, protect the water piping and shut‑off valves against
freezing by adding heat tape (field supply). If the outdoor
temperature can drop below –20°C and no heat tape is used, it is
recommended to install the shut‑off valves indoors.
6.5
Connecting the electrical wiring
6.5.1
About connecting the electrical wiring
Before connecting the electrical wiring
Make sure the water piping is connected.
Typical workflow
Connecting the electrical wiring typically consists of the following
stages:
1
Making sure the power supply system complies with the
electrical specifications of the units.
2
Connecting the interconnection cable between outdoor unit and
HPSU monobloc tank.
3
Connecting the main power supply of the outdoor unit.
4
Connecting the power supply of the HPSU monobloc tank.
5
Connecting the power supply of the optional backup heater
(inside the HPSU monobloc tank; if applicable).
6
Connecting the remote outdoor sensor (if applicable).
7
Connecting the shut-off valve (if applicable).
INFORMATION
For instructions regarding the HPSU monobloc tank, see
the installation manual of the tank.
6.5.2
Precautions when connecting the
electrical wiring
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
6.5.3
Guidelines when connecting the electrical
wiring
Keep the following in mind:
▪ If stranded conductor wires are used, install a round crimp-style
terminal on the end of the wire. Place the round crimp-style
terminal on the wire up to the covered part and fasten the terminal
with the appropriate tool.
b
a
a
Stranded conductor wire
b
Round crimp-style terminal
▪ Use the following methods for installing wires:
Wire type
Installation method
Single-core wire
c b
c
a
a
A
AA´
A´
a
Curled single-core wire
b
Screw
c
Flat washer
