44
FA ROTEX HPSU monobloc compact • 09/2017
7
x
Service and maintenance
With KFE filling connection or with installed
solar
system (see also chap. 6.1)
Ɣ
Without solar system: mount KFE filling connection
(accessory KFE BA,
16 52 15)
on the filling and
draining connection of the ROTEX HPSU monobloc compact
(fig. 3-1 to fig. 3-2, item 10)
or
With solar system:
mount KFE filling connection
(accessory KFE BA,
16 52 15)
on the connection
bracket of the
control and pump unit (RPS4).
Ɣ
Connect the
filling hose
with non-return valve (1/2")
to
the
previously installed
KFE cock
.
Ɣ
Fill the storage tank of the ROTEX HPSU monobloc compact
until water
emerges at the connection
(fig. 7-1,
item 23
)
that was connected
as a
safety overflow
.
Ɣ
Remove the filling hose with non-return valve (1/2").
7.4
Filling, topping up the heating system
7.4.1 Protecting the water circuit against freezing
Frost can damage the system. To prevent the hydraulic compo-
nents from freezing, the software is equipped with special frost
protection functions, that include the activation of pump, internal
heaters, and/or backup heater operation in case of low tempera-
tures.
However, in case of a power failure, these functions cannot guar-
antee protection. It is therefore recommended to add glycol to the
water circuit. The required concentration depends on the lowest
expected outdoor temperature, and on whether you want to pro-
tect the system from bursting or from freezing. To prevent the
system from freezing, more glycol is required. Add glycol accord-
ing to the table below.
Tab. 7-1 Required glycol concentration
1
Solar inflow
2
Safety overflow
Fig. 7-1
Filling buffer storage - without connected DrainBack solar
system
2
1
1
1
RKHWMX(B)500C
RKHWMX(B)300C
DANGER!
During the filling process water may escape
from any leaking points that can cause an elec-
tric shock if it comes into contact with live parts.
Ɣ
Before the filling process, de-energise the
ROTEX HPSU monobloc compact.
Ɣ
After initial filling, check whether all electrical
parts and connecting points are dry before
switching on the power supply for the ROTEX
HPSU monobloc compact.
WARNING!
Polluted domestic water is hazardous to health.
Ɣ
When filling the heating system, make sure
that heating water cannot flow back into the
domestic water pipe.
Observe the notes on the water connection and water
quality according to chap. 2.4 and 4.4.
Ɣ
Protection against bursting: the glycol protects the
pipes against bursting, but does NOT protect the
fluid in the pipes against freezing.
Ɣ
Protection against freezing: the glycol protects the
fluid in the pipes against freezing.
Lowest anticipated
outside temper-
ature
Protection against
bursting
Protection against
freezing
-5 °C
10%
15%
-10 °C
15%
25%
-15 °C
20%
35%
-20 °C
25%
-25 °C
30%