Power of the VKL water radiator
Pressure loss in the valve
(valve Danfoss RA-N 10 angle)
Cooling of water in the radiator
5
VALLOX 75/95
POST-HEATING
J
T
P
L
Y
Y
ø 12mm
V
Post-heating radiator
Water radiator (VKL model)
VKL models come standard with a water radiator (P). Temperature of air going from the unit
is adjusted by a self-actuated thermostat valve (T). Heat pipes coming to the unit are connected
within the unit with 12 mm clamps (L) to the radiator.
Water radiator defrosting
Defrost thermostat (T) of the post-heating radiator (P) stops the unit when the temperature
of the water radiator goes below the setpoint, thereby preventing the freezing risk of the
water radiator. This also causes self-actuated one-way dampers (Y) to close, preventing the
flow of outdoor air to the unit. The unit starts automatically as soon as the risk of freezing
has passed. The threshold temperature of the risk of freezing can be set at the thermostat
(J) of the water radiator.
Though VALLOX 75/95 VKL units incorporate efficient freezing protection, at least detached
houses should be equipped with a separate heating circuit, with a water-glycol mixture (or
other non-freezing solution) as the heat transfer fluid. The system may be equipped with an
optional heat exchanger (V). Without non-freezing water-glycol mixture, there is a risk of
freezing in the post-heating radiator because it is in direct contact with outdoor air.
VALLOX 75 / 95 VKL radiator performance curves
Pressure loss in the VKL water radiator
Pr
essur
e
loss p kPa
0
5
10
15
20
25
30
35
0
0,01
0,03
0,05
0,07
0,09
Water flow dm
3
/s
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
0,05
0,06
0,08
0,1
0,15
0,12
5
10 15 20 30 4050 70 100
7
1
2
3 4
N
kv=0,56
7
kv=0,38
6
kv=0,33
5
kv=0,25
4
kv=0,19
3
kv=0,12
2
kv=0,08
1
kv=0,04
