Domestic Hot Water; Freeze Protection - Johnson Aurum R290 M Serie Guide D'utilisation

CAUTION
The installation of the Y-type strainer at the
water inlet is mandatory
Pay attention to the correct flow direction of
the Y-type strainer.
Sediment may damage the plate heat
exchanger, and there could be refrigerant
leakage risk without strainer.
It is recommended to use strainer with 60
mesh or higher.
NOTE
Problems caused by not installing a filter are
not covered by the warranty.

Domestic hot water

For the installation of the domestic hot water tank
(supplied on the site), refer to the specific manual of
the domestic hot water tank.
Others
NOTE
Air vent valves must be installed at
highest points of the system.
Drain taps must be installed at lowest
points of the system.
5.3 Filling water loop with water
NOTE
Before filling with water, please check 5.7
Water for the water quality requirements.
Pumps and valves may become stuck as a
result of poor water quality.
Connect the water supply to the filling valve and
open the valve. Follow applicable regulations.
Make sure the automatic air vent valve is open.
Ensure a water pressure of approximately 0.2
MPa(2 bar). Remove the air in the loop as much as
possible using the air vent valves. Air in the water
loop could lead to malfunction of the backup electric
heater.
Do not fasten the black
plastic cover on the vent
valve at the topside of
the unit when the system
is running. Open the air
vent valve, and turn it
anticlockwise at least 2
full turns to release air
from the system.
NOTE
The water pressure varies with the water
temperature (higher pressure at higher water
temperature). Always
pressure above 0.03 MPa(0.3 bar) to prevent
air from entering the loop.
Maximum water pressure
keep the water
0.3 MPa(3 bar)
20
5.4 Filling domestic hot water
tank with water
See the specific manual of the domestic hot water
tank.
5.5 Water pipe insulation
The complete water loop including all pipes, must be
insulated to prevent condensation during cooling
operation, heating and cooling capacity reduction,
and freezing of the outside water pipes in winter.
NOTE
The insulation material should be provided
with a fire resistance rating of B1 or above
and comply with all applicable regulations.
The thermal conductivity of the sealing
material should be below 0.039 W/mK.
Recommended thickness of the sealing material is
shown as below.
Piping length (m) between the
unit and the terminal device
< 20
20~30
30~40
40~50

5.6 Freeze protection

5.6.1 Protected by software
The software is equipped with specific functions to
protect the entire system from freezing by using the
heat pump and the backup heater (if available).
When the temperature of the water flow in the
system drops to a certain value, the unit will heat the
water using the heat pump, electric heating tape, or
backup heater.
The anti-freeze function is enabled only when the
temperature increases to a certain value.
Minimum insulation
thickness(mm)
19
32
40
50
V.1