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Thermozone AD300 W, AD400 W
27
Water regulation
VR20/25, Valve set
For the facility to isolate the air-curtain from the water
supply pipe-work (should removal of the air-curtain or
heating coil be necessary) a set of valves are required.
An integral thermostat controls the water low / heat
output.
Use of a bypass valve ensures a small water low is
maintained, the valve quickly responds to heating requi
-
rements as dictated by the thermostat.
The VR20 is suitable for DN20 (
3
/
4
”) pipe-work and the
VR25 for DN25 (1”) pipe-work.
• AV20/25 Stop valve
The stop valve (AV20/25) consists of a ball valve which
is either open or closed.
• JVF20/25, Adjustment valve
Enables adjustment of the water low to the required
level.
KV-value: JVF20, 3,5
JVF25, 7,0
•
TRV20/25, On/off 3-way motor valve
Pressure class PN16, maximum pressure 2000kPa
(20Bar),
Max pressure drop:
TRV20, 100kPa (1,0Bar)
TRV25, 62kPa (0,62Bar).
Kv-value:
TRV20
3,5
TRV25
5,5
• SD20, Valve motor on/off 230V
A thermostat determines if the two position motorised
valve is open or shut, thereby regulating the supply of
heat to the Thermozone.
A 5 second closing of the valve prevents sudden pressure
changes in the pipe system.
The motor is rated at insulation class IP40.
• BPV10, By-pass valve
The BPV10 bypass valve ensures a small water low
is maintained, the valve quickly responds to heating
requirements as dictated by the thermostat even when
the regulation valve (TVV20/25) is closed. To adjust the
valve: close completely and then open it one turn. If the
air curtain is sited at the end of long supply pipe-work
resulting in a low supply pressure, the bypass valve may
be opened even more.
TVV20/25, regulation valve + SD20, actuator + room
thermostat
This combination allows water low regulation and hence
heat output to be controlled by a thermostat, but without
the option of manual adjustment or isolation of the water
supply.
GB
