38
12 - FACTORY OPTIONS AND ACCESSORIES
■ Coil fi lling:
- The coil fi lling must be made with the bleeder valve open
until water runs through it, which is when it is time to close it.
- Cut off the water supply and let the bubbles generated go
up to the highest coil point, which is the same as the bleeder
valve, and eliminate by opening the purger.
- Pour more water into the circuit and repeat the previous steps.
- Activate the water pump (to be foreseen by the installer,
except with the “Very low outdoor temperature” option) and
repeat the previous steps until no air noises are heard in the
piping, which is when the fi lling of the installation will have
■ The pump of the water circuit has to be activated whenever
the 3-way valve is switched on. It is the installer’s responsibility
to connect the pump to the electronic control, except with the
factory-installed “Very low outdoor temperature” option. Please
refer to the wiring diagram provided with the unit.
Operation of the pump with the “Very low outdoor temperature”
option (upon request:
- Antifreeze protection: if the water temperature in the coil drops
below 4ºC, the control activates the pump and the 3-way valve
opens to 100%. The pump stops when 7°C are reached.
- Safety of minimum outdoor temperature: if the outdoor
temperature drops below 4ºC, the control activates the pump
and the 3-way valve opens to maintain, in the water coil, a
water outlet temperature of 10ºC in ON operating mode and
15ºC in OFF operating mode.
12.8 - Hot water coil
■ Hot water coil with a three-way valve managed by the electronic
control of the unit. The water coil could be activated in the
following cases:
- As a backup in HEATING mode, following the input of all the
available compressors (by default) or as fi rst control stage.
- As a backup in HEATING mode in accordance with the supply
temperature.
- During the defrosting operation if selected as backup.
- With the unit running or shut down if an anti-freeze alarm
is triggered.
- With the unit stopped when the outdoor temperature drops
below 4ºC. In this case the circulation pump of the water
circuit is connected.
- As a backup in COOLING mode in accordance with the return
and the outlet temperatures.
Note: the hot water coil is not compatible with the stop-drop in
the indoor coil or the heat recovery coil.
■ This option always incorporates an anti-
freeze thermostat as safety system.
This thermostat is located on the panel
next to he supply fans, if necessary to
reset the safety.
- “Very low outdoor temperature” option (upon request):
with additional anti-freeze technology based on the water
temperature. This protection is made up of a circulation
pump as well as two probes inserted in the input and the
output of the coil.
Important: this option is mandatory for an outdoor temperature
lower than -20ºC WB. Consult for percentages of glycol water
above 20%.
These connections can also be made via the base of the unit
using fl exible piping (for installation with pre-assembly roofcurb).
The position of the sheet metal precuts on the pre-assembly
roofcurb are shown in the following diagram.
C
AB
1
2
50FF/FC
Dimensions (mm)
ABCØ
100 to 280 322 100 184 2”
1
Outlet
2
Inlet
Note: With hot water coil (optional), the length of the supply
duct is reduced by 151 mm.
HOT WATER COIL
BATTERIE D’APPOINT
BATERÍA DE APOYO
HOT WATER COIL
BATTERIE D’APPOINT
BATERÍA DE APOYO
1
Outlet
2
Inlet
50FF/FC
Dimensions (mm)
ABC
100 to 280 289 100 262
■ The inlet/outlet connections of the hot water coil are located
inside the unit and the connection is made via the side panel.
The position of the sheet metal precuts on the side panel are
shown in the following diagram.
been fi nished successfully.
■ In case of long unit stops, and forcibly if they happen in the
winter season, the coil must be emptied.
■ To prevent the water from freezing, with this option the unit
always has an anti-freezing thermostat. Add glycol to the water
if necessary.
■ The direction of the water fl ow must be correct and so the
following indications must be observed:
C
B
1
2
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