WEGER WALTER GMBH DIWER EVO DP80 Series, Installation And Operating Manual

Page: 33 / 64

Installation and Operating Manual Page
31
Printed: 02/2015
6. Connections and operation
The electrical, hydraulic and air connections must be carried out by suitably trained
technicians. This also applies to the operation of the unit.
All connections, e.g. for hot water, cold water, steam and potable water to the air handling
unit must be installed in such a way that the connecting points of the individual components
are easily accessible so that these can be removed.
6.1. Connection of heat exchanger
Before connecting the heat exchangers, carefully clean the duct system.
To avoid damage to the heat exchanger connections, hold the fittings with a pipe wrench.
The heat exchangers must be connected so that they are not exposed to mechanical stress
from the pipeline system. The connecting adapters must not be exposed to any mechanical or
static load. In addition, take suitable measures to protect the heat exchanger against vibration
and the effects of thermal elongation between the air-conditioning unit and the pipeline
system.
When laying the pipes, ensure that they do not obstruct access to the heat exchangers for
maintenance and removal.
Permissible sealing material for threaded sleeves:
- For steam accumulators: special sealing paste
- For water-glycol mixtures: Teflon tape; do not use hemp
For the connection of the heat exchanger, observe the instructions on the unit. Unless
specified otherwise, the heat exchanger work according to the cross counterflow principle.
On request, the heat exchangers are equipped with additional threaded nipples for bleeding
and emptying. The respective valves can be connected to these nipples.
If the heat exchanger is not equipped with nipples for bleeding and emptying, these can be
installed in the connecting lines provided on site.
Additional requirements for air coolers with dehumidifier
It is not permissible to connect water drains directly to the waste water system
(see VDI 6022).