77
Danfoss District Energy
VI.HE.A1.02
DKDHR
Instructions for installation and use
Akva Lux II TDP-F
4.0 Enduser instructions, General
Instructions
Please read these instructions carefully.
The manufacturer accepts no liability for loss or damage resulting from
failure to comply with these instructions. Read and follow these instruc-
tions carefully to prevent the risk of physical injury and/or damage to
property. Exceeding the recommended operating parameters appreci-
ably 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 electrical
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.
If necessary, you can change the temperature settings as described
on page 8. For more detailed information about the substation, see
the sections concerning installation and commissioning.
Description
These instructions apply to substation types Akva Lux II TDP-F, which
are district heating substations for direct heating for single-family,
semi-detached and terraced houses as well as flats. With one heating
circuit and instantaneous water heater for domestic hot water heating.
The Akva Lux II TDP-F, Type 004U8264 is fully enclosed in an EPP insula-
tion box as a standard.
Akva Lux II TDP-F substations are fitted with a differential pressure con-
troller that maintains a constant pressure in the heating circuit(s). The
supply temperature to the radiators is always identical to the district
heating supply temperature. The room temperature is adjusted solely
using the radiator thermostats.
The Akva Lux II TDP-F variants are designed for wall mounting and
are available as built-in variant with a recess box or as wall-mounted
variant.
The Akva Lux II TDP-F, types 004U8264 and 004U8089 are supplied
with bypass thermostat mounted before heat meter (bypass con-
sumption is registered by the heat meter).
For fully insulated Akva Lux II TDP-F, type 004U8264, please note that
a fitting set can be ordered separately to enable a change of feature,
so that bypass consumption is not registered by the heat meter.
Akva Lux II TDP-F, type 004U8044 is supplied with bypass thermostat
mounted after heat meter (bypass consumption is not registered by
the heat meter).
We recommend regular inspections of the substation - ideally in con-
nection with readings of the district heating meter.
Pay special attention to any leaks and an excessively high return tem-
perature in the district heating circuit (poor cooling of the district heat-
ing water). Cooling – i.e. the difference between the supply and return
temperature of the district heating water – has a significant effect on
the overall 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.
Please note
that a low district heating return temperature is directly
related to the return temperature from the heating/floor heating circuit
and the return temperature of the domestic hot water recirculation (in
systems with domestic hot water recirculation). It is therefore important
to focus on these return temperatures.
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 90°C and the operating pressure can be up
to 10 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 notify all users and call for profes-
sional assistance without delay.
Cooling from the water heater alone:
During tapping, the level of cooling will typically be 30–35°C. When
domestic hot water is not being tapped, it is completely normal for the
return temperature from the water heater to rise slightly. In this situa-
tion, the district heating meter will register very modest consumption
as the volume of water is very small.
On substations with recirculation, the heat meter registers the heat
loss in the recirculation pipe.
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.
