STI DrainMaster V 1190, DrainMaster V 2090 Assembly Instruction Manual

Technical data
Installation

Assembly instruction DrainMaster
V-Series

2

It is essential to read through this
instruction carefully prior to the
assembly and initial operation.

General safety instructions

Any installation activities have to be executed by
authorised professional staff. Please pay increased
attention to:

– the conditions on site
– the local regulations
– the recognized rules of engineering (especially
DIN 4757 Part 1 and 3)
– the proper state of the existing roof construction
– the safety rules concerning roof works
– the safety regulations for safety equipment
– the assembly instructions for components given
by your supplier
– the safety instructions of VDE and DVGW

Solely the constructor of the installation is resposible
for a proper assembly.

Functioning of the DrainMaster

The patented DrainMaster is an innovative solution
for draining solar systems. In doing so, only the

collector eld as well as the pipes above the

DrainMaster will be drained.
In a state of rest, the DrainMaster collects the heat
transfer medium. Thereby the installation is unable
to overheat and as a result, the heat transfer medium
and the system components will be protected. The
maintenance charges can be minised and running
the installation becomes safer.
The regulation of the DrainMaster is carried out by
the solar controller.
If there is a temperature measured at the collector
which differs by DeltaT from the temperature
measured in the tank, the circulating pump activates

automatically. The collectors will be lled with the

heat transfer medium which had been collected
in the DrainMaster and in the course of this, the
DrainMaster takes up the air pressed out. The
liquid which has been heated inside the collectors
circulates and heats the tank.
If DeltaT will be undershot or if a maximum
temperature will be reached in the collector, the
circulating pump deactivates, the collectors drain
and the liquid will be collected in the DrainMaster.

The covering of the DrainMaster is a particularly

manufactured aluminium prole for the assembly

with the collectors even outside of the roof cladding.

Any component which gets in contact with the heat
transfer medium is made of stainless steel. Please
make sure to not use material in the solar circuit
which might damage the stainless steel.

Construction of the DrainMaster

The collectors have to be self-draining. The piping
of the collectors has to enable an entire draining.

In the whole solar circuit (ow and backow), ap

valves must not be assembled. As the DrainMaster
enables a low system pressure, a safety valve of

3 bar is sufcient provided that the overall system
height permits it. Flow as well as backow should be

equipped with a syphon as closely as possible at the
heat exchanger so that a thermic pipe circulation can
be excluded.

System requirements

Operation Draining

3

FKA 240

1190

1160

1190

1160

FKA
240

2090

2060

1190

2060

FKA 240FKA 240

FKA 240

60

60

30

30

FKA 240

Volume DrainMaster V-series
V 1190 (1190 mm) 7 l
V 2090 (2090 mm) 12,8 l

Example dimensioning:
Field of six collectors FKA 240V in two rows

Six collectors à 2,65 l
plus connection line ca. 1 l / m

= 16,9 l volume collector eld

Selection of DrainMasters:
Roof-mounted / 1 Basic module V 1190
bottom support: 3 Extension module V 1190

Roof-integrated 1 Basic module V 2090
3 Extension module V 1190

Dimensioning

The DrainMaster always has to be able to take
the whole quantity of liquid of the collector
eld including the connection line above the
DrainMaster.
If there are any insecurities, please contact your
specialist retailer.

Beside the basic module with a degassing and
perfusion zone, extension modules are available for
installations with a higher volume.
These extensions increase the usable volume range
if the installation is in stagnation.

Grid dimension

The DrainMaster series had been adjusted to the
collector FKA 240. Two different lengths can be
offered which refer to the collector types FKA 240 V
(2,2 l) abd FKA 240 H (2,65 l).

When assembling roof-integrated installations with
a sheet metal surrounding, the two DrainMaster
versions can be combined by a modular construction.

(Combination is possible
for roof-integrated installati­ons.)

4

min. 50 cm

Roof-integrated installation

The DrainMaster is suitable for an assembly directly
below the collectors. In doing so, it is necessary to
observe that the DrainMaster always has to be as­sembled below the lowest edge of the collectors, but
at least 50 cm higher than the circulating pump and
the heat exchanger.

Alignment of the connections

The DrainMaster has to be adjusted in such a way
that the inow and outow can be arranged as verti­cal as possible (turn the DrainMaster so that the con­nections are perperndicular).

The connection which is marked with the red label is
the opening of the DrainMaster on top.

Connecting pipes

Please pay increased attention that the connecting

pipes from the collector eld to the DrainMaster do

not present any counter inclination (or syphon).

When installing the backow and the ow above the
lowest edge of the collector eld (e. g. above the
ridge sheet), please pay attention that the backow

(cold side) will be led to the level of the DrainMaster
by a syphon and that it will be piped with a pipe dia­meter up to the highest point in accordance with the
table below.

Number of collectors - wire cross section [mm]

1 12
2 12
3 18
4 20
5 22
6 22