33
HM 6Split
HM 12Split
7 Commissioning and
adjusting
Preparations
1. Check that the switch for the control module is
in position „ ”.
2. Check that the draining valve is fully closed and
that the thermal circuit breaker (FD1) has not de-
ployed.
1. Open the vent valves at the highest point of the
climate system.
2. Set all mixing valves to a position which allows
flow in all heating/cooling circuits.
3. Open the valve for filling the climate system and
fill it with the heating medium, vent the system.
4. Close the vent valve after the system has been
completely filled.
5. Check the pressure gauge, on which an increase
in pressure will be visible. Fill the system to the
required pressure (1,5 - 2,5), then close the filling
valve. The maximum operating pressure of the
system is 2,5 bar.
6. Start the climate system circulation pump. The
automatic vent valves located on the heating/
cooling circuit will begin venting the system.
7. If during venting the pressure falls below 1 bar,
extra heating medium must be added to the cli-
mate system.
Filling and venting
Filling and venting the climate system
and HM 6Split / HM 12Split
Section 7 |
Commissioning and adjusting
Heating water parameters
If the heating circuits are filled with heating water,
the water must comply with the requirements of VDI
Guideline 2035 parts 1 and 2.
To prevent corrosion damage, three basic parameters
of water composition must be controlled:
1. dissolved oxygen content,
2. electrical conductivity and
3. pH.
Oxygen content and electrical conductivity are re-
lated such that lower conductivity allows higher O2
content without fear of increased corrosion. Similarly,
higher conductivity can result in increased suscepti-
bility to corrosion even at relatively low O2 saturation
levels.
The following guidelines are therefore recommend-
ed:
1. Heating water with a low salt concentration - i.e.
where the electrical conductivity of the system
water is less than 100 µS/cm - the dissolved O2
content should be less than 0.1 mg/l.
2. Heating water with a high salt concentration - i.e.
where the electrical conductivity of the system
water is between 100 µS/cm and 1500 µS/cm
- the dissolved O2 content should be less than
0.02 mg/l.
In both cases, the pH value of the heating water
should remain between 8.2 and 10.
In order to prevent damage due to boiler scale, the
following water composition parameters must be
controlled:
System
thermal
output
[kW]
System
capacity
[l/kW]
Alkali earth
element
content
[mol/m3]
Hardness
[
°
d]
≤ 50
≤ 20
no
require-
ments
no
require-
ments
between
20
and 50
≤ 2.0
≤ 11.2
between
50
and 200
≤ 20
≤ 2.0
≤ 11.2
between
20
and 50
≤ 1.5
≤ 8.4
