Rotex GW User Manual

39
FA ROTEX GW - 09/2012
8 x Hydraulic connection
8 Hydraulic connection
8.1 Important information on the hydraulic
connection
To avoid injury to persons and material damage, observe the
following instructions for the hydraulic system connection of the
ROTEX GW.
Protection against scalding
When operating the ROTEX GW, the hot water temperature can
exceed 60 °C. For this reason, install a scald protection
(domestic hot water mixing construction, e.g. VTA32,
15 60 16) when installing the system.
Prevention of emission of exhaust gas
In order to prevent escape of exhaust gas, the condensate siphon
must be adequately filled before commissioning the ROTEX GW
(see chapter ROTEX GW 5.1.2).
Protection against corrosion
In a few regions, the water supply companies supply aggressive
drinking water, which can cause corrosion damage, even with
high-quality stainless steels. Ask your water utility whether using
heating units made from stainless steel can result in corrosion
problems in your area.
Also take into account the requirements of quality of heating
water (see chapter 2.5.4).
Suitable water treatment may be required.
Maximum energy utilisation
The device achieves the most effective energy utilisation when
the return flow temperatures are as low as possible. This requires
hydraulic balancing of the heating system, which is often also a
prerequisite for conveying equipment.
8.2 Equipment information
Procedure
The burner installed in the ROTEX GW heats the heating water
directly via the boiler heat exchanger (direct circuit).
In the event of hot water demand, the 3-way diverter valve
integrated in the ROTEX GW switches the direct circuit as
follows. The water heated by the burner no longer flows into the
heating installation, but circulates internally via the hot water
plate heat exchanger (stainless steel). This diverts the useful
heat to the hot water circuit.
This ensures constant hot water delivery, even with long draw-off
processes.
Water hygiene
The direct hot water heating in the drinking water plate heat
exchanger (continuous-flow water heater) ensures water hygiene
in the ROTEX GW:
– There are no zones with a low flow rate or zones that are not
heated on the hot water side.
– It is impossible for sludge, rust or other sediments to be
deposited, as can be the case with other tanks.
8.3 Hydraulic system connection
8.3.1 Short names in the connection schemes
8.3.2 Connection schematic ROTEX GW
Short
name
Meaning Comment Order
No.
GW Gas condensing boiler
GW 22C 15 00 28
GW 26C 15 00 29
1Cold water
2 Domestic hot water
3 Heating inflow
4 Heating return flow
CW Cold water connection
DHW Hot water draw-off point
H
1
Heating circuit Provided by customer
MAGi
Diaphragm expansion ves-
sel
Supplied with GW.
P
K
Boiler circuit pump
PWTi Plate heat exchanger
t
AG
Flue gas temperature probe Supplied with GW.
t
AU
External temperature sensor accessories 15 00 42
t
V
Heating inflow temperature
probe
Supplied with GW.
t
R
Heating return temperature
sensor
t
W0
Domestic hot water temper-
ature sensor
3UV1 3-way switch valve
Tab. 8-1 Abbreviations on hydraulics plans
Fig. 8-1 Standard connection schematic drawing ROTEX GW
H
1
t
V
t
AG
t
AU
t
W0
t
R
3UV1
PWTi
GW
CW
DHW
P
K
MAGi
1
M
4
3
2

Rotex GW Specifications

General

Brand	Rotex
Model	GW
Category	Boiler
Language	English