MuB_xx_FBC-HC_EN_2011-08-16
Subject to technical modifications!
page 4
EN
Valve drive
NR230-00
ARA 661
Power supply:
230 VAC ±15 %, 50/60 Hz
230 VAC, 50 Hz
Power consumption:
2,5 VA
5 VA
Degree of protection:
n/a
IP 41
Protection class:
II
II
Connection:
Wires, 3 × 0,75 mm²
Wires, 3 × 0,75 mm²
Angle of rotation:
90° electrically limited
90°
Torque:
5 Nm
6 Nm
Running time:
140 s (50 Hz)
120 s / 90°
Direction of rotation:
selectable on terminals
Manual operation:
mechanical disengagement
Indication of position:
yes, reversible scale
Ambient temperature:
0…+50 °C
-5…+55 °C
EMC:
CE accord. 89/336/EWG
EMC 86/336/EEC
Low voltage directive:
CE accord. 73/23/EWG
LVD 2006/95/EC
Maintenance:
maintenance free
n/a
7. MATERIALS
Valves / fittings:
Brass Ms 58
Pipes:
Precision steel pipe, coated
Plastic:
Impact- and temperature resistant
Gaskets:
EPDM-Elastomers or AFM 34
O-Rings:
EPDM
8. TROUBLE SHOOTING
X. PROBLEM
X.X
Possible cause
Solution
1. HEATING CIRCUIT IS NOT GETTING WARM
1.1
The optional temperature limiter (TB) has switched off
the pump (UWP).
Cause: TB is set to a very low value.
Set the TB by approximately 10 K higher than the re-
quired flow temperature.
Take into consideration the max. admissible flow
temperature!
Differential gap of the TB: approx. 5 - 10 K.
The control unit may be ready for operation sooner
if the TB is removed for a short time to allow it to cool
down more quickly to reach the switching temperature.
1.2
The temperature of the boiler’s supply water is lower
than the required flow temperature of the UFH.
Set the boiler's supply water temperature to a higher
value.
2. THE SUPPLY WATER TEMPERATURE CANNOT BE SET TO THE REQUIRED VALUE OR IT FLUCTU-
ATES WITHIN A VERY WIDE RANGE
2.1
The control unit’s SUPPLY and RETURN are not cor-
rectly connected.
Check all inlets and outlets of the control unit for cor-
rect connection. Please take into account Fig. 3.
2.2
The circulating pump’s pressure head/pump stage is
set at a very low value.
Increase the rotation frequency, the pump’s pressure
head/pump stage, respectively.
2.3
The heating load is too big for the control unit used,
i.e., the heat consumption exceeds the rated power of
the control unit. This state may set in temporarily, e.g.,
in case of heating a “cold” floor for the first time.
Check the maximum heat consumption and compare it
with the rated power. If necessary, distribute the heat-
ing circuits to a second control unit / heating circuit.
If the cause is in the initial heating up of a given floor
heating system, the function may be normalized after
the heating up phase. This is possible when the heat-
ing load is at maximum and will then take longer to
achieve the required temperature.
