enervent eWind LTR-2, Installation Instruction

Page: 15 / 96

15
Installation instructions
EN
• The actuator controls the brine flow to the
cooling coil as needed.
5. Isolate the pipes carefully with vapour proof
insulation to prevent condensation on the outside
of the pipes in warm and semi-warm spaces.
Figure 1. Valve and actuator open counter-clockwise and
close clockwise. The figure shows the valve and actuator
in the fully open position. Also, shown is the allowed direc-
tion of the liquid flow.
NOTE:
The valve and actuator must be in the
same position when connected. When the valve
is in the open position, the actuator is turned
counter-clockwise before connecting, and
when the valve is closed, the actuator is turned
clockwise before connecting. Figure 1 above
shows the valve and markings on valve spindle
in valve open (cooling/heating on max) position.
6. Prepare / connect the wiring between the
ventilation unit, the geothermal pump and the
actuator.
Installing CHG geothermal pre-
heating / pre-cooling equipment
A geothermal pre-heating / pre-cooling coil for
improving the system energy efficiency can be installed
in the ventilation system. A duct coil is always used
when a hydronic pre-heating coil is needed. The coil is
installed in the outdoor air duct before the ventilation
unit. The duct or the coil must have a filter to keep dirt
out of the coil.
To avoid freezing the coil, the brine used in the coil
system must meet the local rated temperature value.
• For example in Helsinki, the brine must still
be functional at -26°C whereas in Lapland the
temperature value is -38°C.
It is also possible to use earth to air heat exchangers
(earth tubes) for pre-heating or pre-cooling. The earth
tube must be combined with a normal outside air
duct and a damper that switches the outside air flow
between the earth tube and the normal outside air
duct depending on the actual need for pre-cooling and
pre-heating. The damper can be controlled from the
same relay that controls the circulation pump for the
hydronic pre-cooler / heater.
The CHG pre-heating / pre-cooling system can be built
as a separate system (option 1) or as a part of the geo-
thermal heat system (option 2).
Detailed principal charts are found at the end of this
manual.
Option 1
A ground loop is built for the pre-heating / cooling
coil. To avoid freezing of the system, brine in the
loop must meet the local rated temperature value.
The ventilation unit automatic control regulates the
system’s temperature. The ventilation unit controls the
circulation pump and the 3-way valve.
To install:
1. Install the cooling / heating coil in the outside air
duct.
2. Connect the condense water outlet.
3. Build a separate pump group for circulating cool
brine adjacent to the ventilation unit cooling /
heating coil.
4. Isolate the pipes carefully with vapour proof
insulation to prevent condensation on the outside
of the pipes in warm and semi-warm spaces.
5. Prepare / connect wiring between the ventilation
unit, the circulation pump and the actuator.
6. Install and connect the outside air temperature
sensor (TE01) in the outside air duct before the
duct coil.
•
Refer to the electrical connection diagrams at
the end of this manual.
Option 2
A separate loop is isolated from the geothermal pump
brine loop for the cooling coil. To avoid freezing the coil,
brine in the loop must meet the local rated temperature
value. In addition to this, a heat exchanger is installed
in the coil system to ensure the functionality of the
geothermal pump. For the pre-heating / pre-cooling
coil to yield any benefits there must be some flow in the
collector of the geothermal pump.