14 DKDHR
VI.GP.P2.02
Danfoss District Energy
Instructions for installation and use
VX Solo II substations
4.0 Enduser instructions, General
Instructions
Please read these instructions carefully before installing and commis-
sioning this substation. The manufacturer accepts no liability for loss
or damage resulting from failure to comply with these instructions
for use. Read and follow these instructions carefully to prevent the
risk of physical injury and/or damage to property. Exceeding the
recommended operating parameters appreciably increases the risk
of personal injury and/or damage to property.
Installation, commissioning and maintenance must be carried out
by qualified and authorised personnel (both plumbing and electri-
cal work).
Once the station has been installed and is operating, there is
nor-
mally
no need to alter the settings or other functions. The district
heating substation is very reliable and easy to operate.
For more detailed information about the substation, see the sec-
tions concerning installation and commissioning.
Description
These instructions apply to substation types VX Solo II, which are dis-
trict heating substations for indirect heating for single-family houses,
semi-detatched and terraced houses as well as flats. With one or two
heating circuits for radiator and/or floor heating and with connec-
tion pipes for domestic hot water cylinder on primary or secondary
side. For wall-mounting and with variable connection possibilities.
The HE supply temperature is controlled either by a self-acting ther-
mostat T°C 200 or by a Danfoss ECL controller in combination with an
electronic actuator. The ECL controller acts as the brain of the heating
system. It lets you easily control and optimise system performance
and operation.
We recommend regular inspections of the substation - ideally in
connection with readings of the district heating meter.
Pay special attention to any leaks and an excessively high return
temperature in the district heating circuit (poor cooling of the district
heating water). Cooling – i.e. the difference between the supply and
return temperature of the district heating water – has a significant ef-
fect on the overall energy economy. Therefore, it is important to focus
on the supply and return temperature in the heating system.
The difference should typically be 30–35°C in systems that operate
with radiators. In systems that feature floor heating, the difference
is typically 5–10°C. In these systems, it is important that the supply
temperature does not exceed 35°C.
Irregularities
When reading the meters, check all joints and connections for leaks.
If you identify any irregularities/leaks, contact your professional
provider for assistance.
Check the troubleshooting section before contacting your
professional provider.
Warning! Hot surfaces
Parts of the substation may be very hot and can cause burn in-
juries. Be very careful when you are in the immediate vicinity of
the unit.
Warnings about high pressure and high temperature
The maximum supply temperature in the district heating net-
work can be up to 120°C and the operating pressure can be up
to 16 bar. This may result in a risk of scalding from touching the
substation and from outflow of the medium (water/steam). Ex-
ceeding the substation design data and operating parameters for
pressure and temperature carries an appreciable risk of personal
injury and/or damage to property.
Emergencies
In the event of fire, leaks or other hazards, immediately shut off
all sources of energy to the substation, if possible, and call for
appropriate assistance.
If the domestic hot water is discoloured or malodorous, shut off
all ball valves on the substation and the storage cylinder, notify
all users and call for professional assistance without delay.
