99
Danfoss District Energy
VI.HE.M1.02
DKDHR
Instructions for installation and use
VX Solo HWS substations
8.0 Description of VX Solo HWS
Substation for indirect heating for single-family, semi-detatched
and terraced houses as well as flats. With one heating circuit for ra-
diator or floor heating and with connection pipes for domestic hot
water cylinder on the secondary side. For wall-mounting.
The temperature for the heating circuit is controlled by a self-acting
temperature controller Danfoss AVTB.
An applicable immersion control thermostat of your choice, used
to control the water temperature in the hot water cylinder must be
mounted on site.
Danfoss offers an immersion control thermostat type ITC, which must
be ordered separately and supplied loose with the substation for
mounting on site.
The substation is prepared for mounting of a programmable TP9000
controller, which allows heating and DHW operation according to
demand. The integrated room thermostat will open/close the zone
valve for heating operation and the DHW sensor in the cylinder or
the DHW timer will open/close the zone valve for DHW operation.
Please note:
Your substation may look different than the substation shown, as vari-
ants with other components may be supplied.
Supplier instructions for the fitted components will always be supplied
together with the substation.
9.0 Installation instructions, general
Installation
The installation, connection and maintenance of the substation must
be performed by qualified and authorised personnel.
Installation must always be performed in accordance with the ap-
plicable legislation and in compliance with these instructions.
The substation must be installed so that it is freely accessible and can
be maintained without unnecessary disruption. Lift the substation
by its mounting plate and secure it to a solid wall using 2 sturdy
bolts, screws or expansion bolts positioned in the two keyholes in
the mounting plate.
Before commissioning, rinse all the pipes in the household piping
system thoroughly to remove any impurities, and check and clean
the dirt strainers in the substation.
Connect the substation to the household piping in accordance with
the labelling at the bottom/top and/or in accordance with the instruc-
tions in this manual.
Test and connections
Before filling the system with water, retighten all the pipe connections
because vibrations and shocks during transport and handling may
have caused leaks. Once the system has been filled with water, tighten
all the pipe connections once more before performing pressure test
for leaks. After heating of the system, check all the connections and
retighten if necessary.
Please note that the connections feature EPDM rubber gaskets!
Therefore, it is important that you DO NOT OVERTIGHTEN the union
nuts. Over-tightening may result in leaks. Leaks caused by over-
tightening or failure to retighten connections are not covered by
the warranty.
Connections
Connection of pipes for DH supply and return, common return as well
as DHW cylinder is established in top of the substation, and connec-
tion of pipe for HE supply is established in bottom of the substation.
