Ventilation unit with heat recuperation
DUOVENT
®
COMPACT RV
16
5.2.5 WATER COOLER CONNECTION
A unit equipped with a water cooler (DCC unit code) is connected to the cooling medium by means of a three - way mixing unit (see "Types of
ESUCH control units"). The water cooler outlets are located on the front or top part of the unit and are threaded. The exchanger must be
connected in counter-current to the flow of air passing through (in concurrent connection, the exchanger loses approx. 25 % of its output).
When tightening the heat exchanger connections, it is necessary, for example, to hold the heat exchanger neck with a second wrench so that
the tightening torque is not transmitted to the heat exchanger body.
For the correct connection of cooling water, the direction of water flow is indicated on the casing of the unit by auxiliary labels (the exchanger
must be connected in counter-current):
cooling
water
inlet
cooling
water
outlet
air flow
direction
air flow
direction
cooling
water
inlet
cooling
water
outlet
For the water cooler to function properly, the cooler must be vented after connecting and filling the system with cooling water. The vent screws
are located directly at the heat exchanger connection necks. The vent screws are accessible from the outer operating side of the unit.
Before starting service work on the heat exchanger (when replacing it), it is necessary to drain the heating water distribution system connected to
the heat exchanger and drain the heat exchanger itself using the drain screws on the heat exchanger collectors. The heat exchanger can then be
disconnected from the cooling water distribution system and removed from the unit.
Max. operating water pressure of water coolers:
1.6 MPa
Hydrogen exponent of heating water: pH 7-9
Heating water hardness: 1.0 mval / l
The water cooler section is equipped with a drip eliminator, which must always be installed in the unit during cooler operation.
All piping must be installed independently of the heat exchangers - the cooling water piping must not act on the necks of the heat exchangers due
to its weight and expansion. We recommend the antifreeze mixture as a heat transfer medium for all outdoor units.
Units taken out of service must be protected against freezing by draining water from all parts of the unit. Residual water from the exchanger can
be expelled with compressed air.
CAUTION!
DCA/DCB/DCC water exchanger can be used also for water with antifreeze mixture (based on
propylene-glycol, ethylene-glycol etc.). We recommend e.g. concentrated antifreeze liquid
!
FRITERM E STABIL or FRITERM P PLUS (recommended dilution for temperature resistance to
-18 °C 1:2 = 1 part FRITERM E STABIL: 2 pats of water). The recommended dilution for each type
of coolant and the required frost resistance is included in the packaging of these antifreeze
concentrates. For DCA/DCB/DCC water exchangers, we always recommend filling with antifreeze
mixture with min. concentration of 20:80 as the liquids contain also other corrosion inhibitors and at
least minimum resistance of the mixture to the frost of ca -5 °C.
Size unit
cooler type
thread
800
IKW-DUOVENT
®
RV 800-ErP2018
3/4"
1800
IKW-DUOVENT
®
RV 1800-ErP2018
3/4"
3000
IKW-DUOVENT
®
RV 3000-ErP2018
1 1/2"
4200
IKW-DUOVENT
®
RV 4200-ErP2018
1 1/2"
6000
IKW-DUOVENT
®
RV 6000-ErP2018
1 1/2"
7800
IKW-DUOVENT
®
RV 7800-ErP2018
1 1/2"
