E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
Installation manual
20
7.
C
HARGING
WATER
1
Connect the water supply to a drain and fill valve (see
"5.2. Main
components" on page 10
).
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.
8.
P
IPING
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.
9.
E
LECTRICAL
WIRING
WORK
9.1.
Precautions on electrical wiring work
INFORMATION
■
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 EU directive
98/83 EC.
NOTICE
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).
When water is at standstill inside the system, freezing is
very likely to happen and damaging the system in the
process.
A
<A
WARNING: Electrical installation
All field wiring and components must be installed by an
installer and must comply with the applicable legislation
DANGER: ELECTRICAL SHOCK
See
"2. General safety precautions" on page 2
.
WARNING
■
All field wiring must be carried out in accordance with
the wiring diagram supplied with the unit and the
instructions given below.
■
Electrical connections shall be made to fixed wiring.
■
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.
■
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 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. Secure the electrical
wiring with cable ties as shown in
figure 2
so that it
does not come into contact with the piping
(particularly on the high-pressure side) or sharp
edges.
Make sure no external pressure is applied to the
terminal connections.
■
Power supply wires must be attached securely.
■
If the power supply has a missing or wrong N-phase,
equipment will break down.
■
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.
■
Be sure to install an earth leakage circuit breaker in
accordance with the applicable legislation. Failure to
do so may cause electric shock or fire.
■
When installing the earth leakage circuit breaker
make sure that it is compatible with the inverter
(resistant to high frequency electrical noise) to avoid
unnecessary opening of the earth leakage circuit
breaker.
■
As this unit is equipped with an inverter, installing a
phase advancing capacitor not only will deteriorate
power factor improvement effect, but also may cause
capacitor abnormal heating accident due to high-
frequency waves. Therefore, never install a phase
advancing capacitor.
■
Be sure to use a dedicated power circuit; never use a
power supply shared by another appliance.
■
Be sure to install the required fuses or circuit
breakers.
NOTICE
The earth leakage circuit breaker must be a
high-speed type breaker of 30 mA (<0.1 s).
