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12 - FACTORY OPTIONS AND ACCESSORIES
12.12 - 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.
■ This option always incorporates an anti-freeze thermostat as
safety system.
■ There are two confi guration types available:
- Standard (HAS),
the unit 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 (HAF), with adittional freeze
protection 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%.
Note: on units with the "Very low outdoor temperature" option,
air supply only may be lateral (factory-confi gured).
■ 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:
- 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.
■ 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 diagrams.
"Standard" assemblies
1 2
C
A B
"In-line" assemblies
1 2
B
Dimensions (mm)
020 to 047
Standard
052 to 062
070 to 099
052 to 062
In-line
070 to 093
In models 052 to 093 it can also be made via the base of the
unit using fl exible piping (only available for units without pre-
assembly roofcurb).
The position of the sheet metal precuts on the base are shown
in the following diagrams.
"Standard" assemblies
B
2
1
A
C
"In-line" assemblies
2
1
B
Dimensions (mm)
052 to 062
Standard
070 to 099
052 to 062
In-line
070 to 093
■ 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.
Outlet
Inlet
1
2
Outlet
Inlet
1
2
C
A
A
B
C
142
160
158
159
245
158
159
245
158
934
280
158
1314
280
158
Outlet
Inlet
1
2
Outlet
Inlet
1
2
C
A
A
B
C
280
100
140
280
120
180
1597
270
170
1851
200
170
Ø I/O
1 ¼"
2"
2"
2"
2"
Ø I/O
2"
2"
2"
2"
47
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