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NOTE
Be aware of the hygroscopic property of glycol: it
absorbs moisture from its environment.
Leaving the cap off the glycol container causes the
concentration of water to increase. The glycol
concentration is then lower than assumed. And in
consequence, freezing can happen after all.
Preventive actions must be taken to ensure minimal
exposure of the glycol to air.
Also refer to
"Checks before initial start-up" on page
Charging water
1
Connect the water supply to a drain and fill valve (see
components" on page
12).
2
Make sure the automatic air purge valve is open (at least 2
turns).
3
Fill with water until the manometer indicates a pressure of
approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves. Air present in the water
circuit might cause malfunctioning of the backup heater.
4
Check that the backup heater vessel is filled with water by
opening the pressure relief valve. Water must flow out of the
valve.
NOTE
During filling, it might not be possible to remove all
air in the system. Remaining air will be removed
through the automatic air purge valves during first
operating hours of the system. Additional filling
with water afterwards might be required.
The water pressure indicated on the manometer
will vary depending on the water temperature
(higher pressure at higher water temperature).
However, at all times water pressure should
remain above 1 bar to avoid air entering the
circuit.
The unit might dispose some excessive water
through the pressure relief valve.
Water quality must be according to EN directive
98/83 EC.
If no glycol is in the system in case of a power supply
failure or pump operating failure, drain the system (as
suggested in the figure below).
A
When water is at standstill inside the system, freezing is
very likely to happen and damaging the system in the
process.
Installation manual
17
27.
"Main
<A
Piping insulation
The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity as well as prevention of freezing of the
outside water piping during winter time. The thickness of the sealing
materials must be at least 13 mm with 0.039 W/mK in order to
prevent freezing on the outside water piping.
If the temperature is higher than 30°C and the humidity is higher than
RH 80%, then the thickness of the sealing materials should be at
least 20 mm in order to avoid condensation on the surface of the
sealing.
Field wiring
WARNING
A main switch or other means for disconnection,
having a contact separation in all poles, must be
incorporated in the fixed wiring in accordance with
relevant local laws and regulations.
Switch off the power supply before making any
connections.
Use only copper wires.
For W1
Make sure to connect power supply cables in normal
phase. If connected in reverse phase, the remote
controller of the indoor unit indicates " U1 " and the
equipment cannot operate. Change any two of the
three power supply cables (L1, L2, L3) to correct
phase.
Never squeeze bundled cables and make sure that it
does not come in contact with the piping and sharp
edges.
Make sure no external pressure is applied to the
terminal connections.
All field wiring and components must be installed by a
licensed electrician and must comply with relevant
local laws and regulations.
The field wiring must be carried out in accordance
with the wiring diagram supplied with the unit and the
instructions given below.
Be sure to use a dedicated power supply. Never use a
power supply shared by another appliance.
Be sure to establish an earth. Do not earth the unit to
a utility pipe, surge absorber, or telephone earth.
Incomplete earth may cause electrical shock.
DANGER
Be sure to install an earth leakage circuit
breaker in accordance with relevant local
and national regulations. Failure to do so
may cause electrical shock.
Be sure to install the required fuses or circuit
breakers.
E(D/B)(H/L)Q011~016BA6V3+W1
Unit for air to water heat pump system
4PW57621-1A
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