4 | © Danfoss | Produced by Danfoss Redan A/S | 2022.03
145X2068
AQ40514397064001-000101
2. CONNECTION, SAFETY AND HANDLING
Instructions
This operating manual should be read carefully before installation and
start-up of the substation. The manufacturer accepts no liability for
damages or faults that result from non-compliance with the operating
manual. Please read and follow all the instructions carefully to prevent
accidents, injury and damage to property. The risk of persons being
injured and equipment damaged increases considerably if the recom-
mended permissible operating parameters are exceeded.
Installation, assembly work, first start-up and maintenance work may be
carried out only by qualified and authorized personnel in compliance
with the safety regulations (both heating and electrical work).
Energy source
The substation is designed for district heating as the primary source of
energy. However, also other energy sources can be used where the ope-
rating conditions allow it and always are comparable to district heating.
Application
The substation is designed only to operate with water and other heating
media may not be used.
Connect the substation to the house piping in a frost-free room, where
the temperature does not exceed 50 °C and the humidity does not ex-
ceed 80%. Do not cover or wall up the substation or in any other way
block the entrance to the station.
Choice of material
Choice of materials always in compliance with local legislation.
Corrosion protection
T
he risk of equipment corrosion increases considerably if recommended
permissible chloride compounds are exceeded.
All pipes are made of min. AISI 304 (heating) and min. AISI 316 (domestic
water) stainless steel as well as brass. Components for domestic water,
however, primarily in dezincification-resistant brass. Heat exchangers
are made of stainless steel and are copper-soldered or steel-soldered.
Surfaces in contact with water can be subject to two problems, limescale
formation and corrosion.
The nature of the water will be of great importance in this context, where
the pH value, chlorides, gases, etc., have a decisive effect on how much
lime is deposited and how aggressive the water is.
The temperature also has a great influence in this context. For example
the corrosion rate increases by a factor of 2 to 3 for every 10° C tem-
perature rise.
With knowledge of the chemical water composition and operating
conditions of a heating system, the risk of scaling and corrosion can be
assessed. Based on that, recommendations can be made to avoid scaling
and/or corrosion problems in the components.
See item 19, page 43 for more detailed Guidelines for Water Quality in Dan-
foss brazed heat exchangers and recommended Chloride concentration
to avoid Stress Corrosion Cracking.
Safety valve(s)
We recommend mounting of safety valve(s), however, always in com-
pliance with local regulations.
Noise level
≤ 55 dB
Storage and Handling
If thesubstation is stored before installation, make sure that the place is
dry and heated. Humidity max. 80% and storage temperature 5-70 °C).
Do not stack the unit higher than factory shipped. Units that are shipped
in cardboard packaging are to be lifted by the carrying handles of the
packaging. Transport / removals over great distances should be carried
out on pallets.
During and after unpacking, the water heater can be lifted by hand
in the mounting plate. Note that lifting in the pipes can cause leaks.
ALWAYS re-tighten.
Handling
When working on the water heater suitable safety shoes must be worn.
Connections
The substation must be equipped with features that ensure that the
water heater can be separated from all energy sources (also power
supply).
Warning of hot surfaces
Parts of the water heater may become hot and hot surfaces can
cause serious burns. Please be extremely cautious in close proxi-mi-
ty to the water heater.
Warning of high pressure and high temperature
The stations work at a maximum supply temperature from the dis-
trict heating network of 120°C and the stations work with a operat-
ing pressure of 16 bar, which may put the user at risk of burns from
touching the surface or from the emissions of hot media (water/
steam). The risk of persons being injured and equipment damaged
increases considerably if the recommended permissible operating
parameters are exceeded.
Emergency
In case of danger or accidents - fire, leaks or other dangerous circum-
stances - interrupt all energy sources to the station if possible, and
seek expert help.
In case of discoloured or bad-smelling domestic hot water, close all
shut-off valves on the water heater, inform the operating personnel
and call for expert help immediately.
Warning of transport damage
Before water heater installation, please make sure that the water
heater has not been damaged during transport. Always transport
the water heater with the utmost care and caution.
IMPORTANT - Tightening of connections
Due to vibrations during transport all flange connections, screw
joints and electrical clamp and screw connections must be check-ed
and tightened before water is added to the system. After water has
been added to the system and the system has been put into opera-
tion, re-tighten ALL connections.
(Do not overstrain! - See page
10, Test and connections
)
NOTE:
Interventions/rework on our components results in loss of
warranty.
Montage- und Betriebsanleitung / User manual
VXe SLS
