radistat mk2 1976.09 - TA Hydronics

The AHA thermostat-controlled radiator valve is intended
for 2-pipe systems provided with pump circulation. This
valve is very effective when it comes to keeping the air
temperature at the value set on the regulator scale. Valves of
this type shall not be preset.
This valve is delivered with a plastic hand regulator that
protects it during the final phases of construction work.
After construction work 'is finished, the regulator body can
easily be added when the installation is put into use.
W Radistat M k2 is provided with a die-cast AMETAP body
and with a brass bonnet and spindle. The coordinating
dimensions of this valve comply in full with Swedish SMS
standards. In principle, the thermostat section comprises a
liquid-filled sensing element with large contact surfaces. The
movements of this sensing element control the valve. It is
provided with a thermally insulated casing which acts as a
radiation shield, easy to clean. The regulator scale is provided
with relative temperature graduations, easy to read. No calibration
is required on the site. One digit on the scale corresponds
to a temperature change of about ca 2,5O C (5O F) in
the room. The number 5 corresponds to a room temperature
of ca + 21° C (70' F).
At the end of the scale marked r~ the valve is closed,
although it will open in response to low temperature (freez-
ing protection).
Flow is regulated by a spring-loaded spindle provided with
a rubber seal. The valve can be locked with a catch pin when
a suitable setting has been arrived at, thus preventing any
A H ANDERSSON & C0 AB
Postal address Box 120, S-501 03 BOR AS, SWEDEN
Telephone 033-1 0 02 30
Te lex 36134 ahab s
Telegrams ahaarmatur
AUTOMATIC RADIATOR VALVE
RADISTAT Mk2
unauthorized person from changing the setting (useful in
schools and other public places for example). The catch pin
can easily be unlocked if the valve setting needs to be
changed.
The AHA KOMBI compression coupling consists of a thrust
screw, internal sleeve and olive (double-taper olive or adapter
olive). The thrust screw has external pipe threads. See flap 4,
sheet 3. For information about applications and fitting, see
the sheet entitled "AHA compression coupling" under flap 4
in the AHA catalogue.
AHA
Straight
Straight with elbow
Angle
Straight with rernote sensing head
Straight with elbow - remote sensing head
Angle with rernote sensing head
All types of Radistat Mk2 can be connected to smooth tubes
by means of the AHA KOMBI coupling.
Information about different connections is presented on the
following pages.
Sheet 5
Page 1
76.09 1

TECHNICAL DESCRIPTION
1
Sheet 5
Page 2
76.09
Appl ication :
Temperature range:
Regulation accuracy:
Max. static pressure:
Max. differential pressure:
Max. working temperature:
Freezing protection :
Surface treatment:
Length of capillary tube:
Testing:
Packing:
Heating systems. Used primarily in 2-pipe systems with
pump circulation.
10-28O C (50-82O F)
1" C (k 1.8' F)
l.OMPa= 10 bar 150 psi
20 mWG ..L 200 kPa = 2 bar
+ 10oO C (21 2O F)
(Serising element must not be exposed to higher surface
temperature than + 60' C (140' F)
With standard temperature range this valve opens at + 8O C
(46.4O F)
Each valve is individually tested before despatch, both for
seat sealing and overall teak-tightness.
Delivered in corrugated board package which protects valve
during delivery.
The thermostat section should be stored in a cool place until
it is to be fitted, Le. after the final phase of the construction
work is finished and the pipes are clean. Fitting directions
and instructions for adding the regulator body are inserted in
the package.
Capacity and pressure drop: The rate of flow and the associated pressure drop across the
valve can be obtained from the capacity diagram. The lines
marked with temperatures refer to the temporary deviations
in air temperature relative to the setting which affects the
regualting mechanism in such a way as to restore the desired
temperature level.
Björsell, Boras

R = Cy lindrical pipe thread
KR K = Short tapered pipe thread
D = Outside tubing diameter
Example showing how to order:
AHA 50 324-204
RADISTAT Mk2
In this example 50 indicates the product group, 324 indicates
the catalogue no. and 204 (variety and size no.) indicates the
desired conn.no. 10, for clamp connection to plain pipes of
10 mm 0.d.
Approximate insertion length in KOMBI coupling after Dimension desiqnation D for the KOMBI shall be the same as
tightening appears under column headed "I" in the table. the outside diameter of the tubing.
AHA 50 321 Article Nurnber Size R
KRK
-
AHA 50 324
*)H = Fully open valve
A H ANDERSSON & C0 AB
Postal address Box 120, S-501 03 BOR AS, SWE DEN
Telephone 033-10 02 30
Telex 361 34 ahab s
Telegrams ahaarmatur
1 o
15
20
3/8
1 12
314
Neight
kg

RADISTAT Mk2
--- -
AHA 50 322 Article number
AHA 50 325
, - -0 38- ,
AHA 50 323 L@ 384
m-
AHA 50 326
*)H = Fully open valve
Size
1 o
15
20
1 o
15
20
-
10
15
20
10
15
20
Neight
kg
0.35
0,43
0.57
0.38
0.48
0,65

1 o
15
20
1 o
15
20
RADISTAT Mk2
AHA 50 331 Article number Size R
Weight
KRK
kg
AHA 50 334
AHA 50 332 1-0 44-1
AHA 50
*) H = fully open valve
A H ANDERSSON & C0 AB
Postal address Box 120, S-501 03 BOR AS, SWEDEN
Telephone 033-10 02 30
Telex 36134 ahab s
Telegrams ahaarmatur
318
1 12
314
318
1 12
314
Sheet 5
Page 5
76.09 1

RADISTAT Mk2
AHA 50 333 Article number size
AHA 50 336
*)H = Fully open valve
- -
AHA 50 341 -001
p P
Fixed sensing head.
For easy connection to mounted valve
"prepared for thermostatic control", m72 or S74,
without draining the heating system.
AHA 50 342-001 , 044 , 25 Remote sensing head.
For easy connection to mounted valve "prepared for
thermostatic control", m72 or S74, and for changing Radistat M k2
with fixed sensing head, without draining the heating system.
Length of capillary tube: 1.8 m.
The remote sensing head is protected by a discreet plastic
casing. Details for mounting the remote sensing head
and capillary tu be are enclosed.
AHA 50 343-201
1
Sheet 5
Page 6
76.09
Bonnet for thermostatic control
Fitted for AHA'S hand operated radiator vavles m72 and S74.
This bonnet is protected by a plastic wheel which can
be used as a hand operating wheel during the time
of building.

Setting Knob M s
Thermostatic Bellows M
Regulating spring M
Inletforliquid M
Valve operating stem P
Setting Pin (2 pes) M
Mounting stem P
Over stem M
Supporting washer P
Gland carrier M
Material r
M = Metal
P = Plastic
R = Rubber
A H ANDERSSON & C0 AB
Postal address Box 120, S-501 03 BOR AS, SWEDEN
Telephone 033-1 0 02 30
Telex 361 34 ahab s
Telegrams ahaarmatur
Radistat Mk2
Sheet 5
Page 11
76.05
Partspecif ication