PAW K35 Owner's manual

PAW GmbH & Co. KG
Böcklerstr. 11, D-31789 Hameln, Germany
Phone: [phone], Fax: [phone]
E-mail: [e-mail], Web: www.paw.eu
Installa
InstallaInstalla
Installation and Operation Instructions
tion and Operation Instructionstion and Operation Instructions
tion and Operation Instructions
K35 Modular Heating Circuit
K35 Modular Heating CircuitK35 Modular Heating Circuit
K35 Modular Heating Circuit
with 3
with 3with 3
with 3-
--
-temperature mixing valve
temperature mixing valvetemperature mixing valve
temperature mixing valve

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1 General information
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Contents
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1 General information
General informationGeneral information
General information ................................
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1.1 Scope of these instructions .......................................................................................... 3
1.2 Designated use ............................................................................................................ 3
2
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2 Safety instructions
Safety instructionsSafety instructions
Safety instructions ................................
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3
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3 Product description
Product descriptionProduct description
Product description ................................
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5
3.1 Equipment .................................................................................................................... 5
3.2 Function ....................................................................................................................... 6
3.2.1 3-temperature mixing valve [specialist] .................................................................. 7
3.2.2 Change of the flow line [specialist] ........................................................................ 8
3.2.3 Check valve and non return valve [specialist] ...................................................... 11
3.3 Optional equipment: actuator [specialist] .................................................................... 12
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4 Assembly and installation [specia
Assembly and installation [speciaAssembly and installation [specia
Assembly and installation [specialist]
list]list]
list] ................................
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1313
13
4.1 Accessories: compression fitting (not included in delivery) ......................................... 13
4.2 Assembly of the heating circuit ................................................................................... 14
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5 Scope of delivery [specialist]
Scope of delivery [specialist]Scope of delivery [specialist]
Scope of delivery [specialist] ................................
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6 Technical data
Technical dataTechnical data
Technical data ................................
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6.1 Pressure drop and pump characteristics .................................................................... 18
Item no. 9936092x – Version V04 – Issued 2012/02
Translation of the original instructions
We reserve the right to make technical changes without notice!
Printed in Germany – Copyright by PAW GmbH & Co. KG
PAW GmbH & Co. KG
Böcklerstr. 11
31789 Hameln, Germany

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1 General information
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1
11
1General information
General informationGeneral information
General information
1.1
1.11.1
1.1 Scope of these instructions
Scope of these instructionsScope of these instructions
Scope of these instructions
These instructions describe the installation, commissioning and operation of the K35 modular
heating circuit with 3-way mixing valve. For other components of the heating system such as
pumps, controllers or distribution manifolds, please observe the instructions of the
corresponding manufacturer. The chapters called [specialist] are intended for specialists only.
1.2
1.21.2
1.2 Designated use
Designated useDesignated use
Designated use
The modular heating circuit may only be used in hydronic heating closed-loop systems taking
into consideration the technical limit values indicated in these instructions. The heating circuit
must not
notnot
not be used in domestic water applications. Improper usage excludes any liability claims.
Only use PAW accessories with the modular heating circuit.
The wrapping materials are made of recyclable materials and can be disposed of with
recyclable materials.

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2 Safety instructions
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2
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2Safety instructions
Safety instructionsSafety instructions
Safety instructions
The installation and commissioning as well as the connection of electrical components require
technical knowledge commensurate with a recognised vocational qualification as a fitter for
plumbing, heating and air conditioning technology, or a profession requiring a comparable level
of knowledge [specialist]. The following must be observed during installation and
commissioning:
•relevant local and national regulations
•accident prevention regulations of the professional association
•instructions and safety instructions mentioned in this manual
CAUTION
CAUTIONCAUTION
CAUTION
Personal injury and damage to property!
Personal injury and damage to property!Personal injury and damage to property!
Personal injury and damage to property!
The modular heating circuit must only be used in hydronic heating closed-loop
systems filled with heating water according to VDI 2035 / Ö-Norm H 5195-1.
The heating circuit must not
notnot
not be used in domestic water applications.
NOTICE
NOTICENOTICE
NOTICE
Material damage due to mineral oils!
Material damage due to mineral oils!Material damage due to mineral oils!
Material damage due to mineral oils!
Mineral oil products cause lasting damage to seals made of EPDM, whereby the sealant
properties are lost. We do not assume liability nor provide warranty for damage to property
resulting from sealants damaged in this way.
It is imperative to avoid that EPDM gets in contact with substances containing mineral
oils.
Use a lubricant based on silicone or polyalkylene and free of mineral oils such as
Unisilikon L250L and Syntheso Glep 1 of the Klüber company or a silicone spray.

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3
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3Product description
Product descriptionProduct description
Product description
The heating circuit K35 is a preassembled fitting group for hydronic heating closed-loop
systems.
The heating circuit is designed such that it can be directly mounted onto a mounting plate with
thread connections or onto a distribution manifold. The distance between the pipe axis and the
wall must be at least 10 cm, as the connection C-3 is on the back side of the mixing valve.
3.1
3.13.1
3.1 Equipment
EquipmentEquipment
Equipment
Rear view of the mixing valve
A-1 Flow to the consumer circuit
A-2 Full metal thermometer with
immersion sleeve
integrated in the ball valve (flow)
B Heating pump
C 3-temperature mixing valve
C-1 High-temperature flow
from the buffer tank
C-2 Return to the buffer tank
C-3 additional connection on the back
side of the mixing valve, for supply
of the low-temperature flow
C-4 Non return valve, can be opened
D-1 Check valve, can be opened
D Return pipe
E Design insulation
with optimised function
F-2 Full metal thermometer with
immersion sleeve
integrated in the ball valve (return)
F-1 Return from the consumer circuit

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3.2
3.23.2
3.2 Function
FunctionFunction
Function
Assembly with radiator circuit
K35
K35 K35
K35 -
--
- 3
33
3-
--
-temperature mixing valve with additional
temperature mixing valve with additional temperature mixing valve with additional
temperature mixing valve with additional
connection for
connection forconnection for
connection for a second flow temperature
a second flow temperaturea second flow temperature
a second flow temperature
The 3-temperature mixing valve is used in
combination with a buffer tank, which can be
heated by either a solar thermal installation, a
solid fuel boiler or a conventional boiler.
If the consumer only needs a low temperature
level, such as radiant panel heating systems, the
3-T mixing valve first takes the the flow water
from the intermediate part of the storage tank.
When the temperature in this part is no longer
sufficient, the hot water from the upper part of
the tank is used.
By using two parts of the storage tank for two
different flow temperatures, the energy from the
buffer tank can be used more efficiently. The
return temperatures are low and the stratification
in the tank is maintained.
Applications:
Applications:Applications:
Applications:
•Heating systems with buffer tank and
solar heating support
•Control of radiant floor or wall heating

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3.2.1
3.2.13.2.1
3.2.1 3
33
3-
--
-temperature mixing valve [specialist]
temperature mixing valve [specialist]temperature mixing valve [specialist]
temperature mixing valve [specialist]
The 3-temperature mixing valve driven by an electric motor adjusts the flow temperature of the
consumer circuit to the desired value in combination with a flow sensor and the controller.
The 3-temperature mixing valve is equipped with a second flow connection (C-3) on the back
side. This connection allows to take water with a low flow temperature from the intermediate
part of the tank (for example a buffer tank).
Position 0-5: The flow temperature is
attained by mixing return
water and water from the
intermediate part of the tank
Position 5: 100% supply from the
intermediate part of the tank
Position 5-10: The flow temperature is
attained by mixing water
from the intermediate part
and the upper part of the
tank

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3.2.2
3.2.23.2.2
3.2.2 Change of the flow line [specialist]
Change of the flow line [specialist]Change of the flow line [specialist]
Change of the flow line [specialist]
Dismounting the mixing valve
Dismounting the mixing valveDismounting the mixing valve
Dismounting the mixing valve
1. Take off the thermometer handles (A-2, F-2) and remove the insulating front shell.
2. Take the heating circuit out of the insulating back shell.
3. Dismount the mixing valve (C).
Conversion of the mixing valve
Conversion of the mixing valveConversion of the mixing valve
Conversion of the mixing valve
1. Unscrew the screw (1).
2. Take the rotary knob (2) off the rod of the cock.
3. Unscrew the screw (3).
4. Take off the cover plate (4).
5. Unscrew the two screws (5).
6. Remove the front plate (6).
7. Extract the sealing bush (7) and the valve cock (8) from the mixing valve body.
8. Unscrew the screws (10) on the back side of the mixing valve and take off the cover (9).
9. Pull the sealing plug (11) to the front using pliers. Remove the flow-reducing plate (12)
by pushing from front to back.

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16. Turn the cover plate (4) such that the designation PAW is at the bottom and the scale is
located as can be seen in the figure above.
17. Fix the cover plate (4) with the screws (3).
18. Put the rotary knob (2) onto the cock rod.
19. Fix the rotary knob (2) to the cock (8) with the screw (1).
Assembly position
for mixing valve with flow on the left
10. Turn the body of the mixing valve by 180°.
11. Mount the flow-reducing plate (12) on the back
side and the sealing plug (11) on the front.
12. Mount the cover (9) on the back side of the mixing
valve. The letters on the cover indicate the correct
assembly position:
flow on the left: L points upwards
flow on the right: R points upwards
13. Fix the cover (9) using the screws (10).
14. Insert the sealing bush (7) and the valve cock (8)
into the channel of the mixing valve.
15. Fix the front cover (6) with the screws (5).
Mixing valve with flow on the right Mixing valve with flow on the left
Flow
Flow

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Modification and
Modification andModification and
Modification and commissioning of the heating circuit
commissioning of the heating circuitcommissioning of the heating circuit
commissioning of the heating circuit
1. Interchange the return pipe (D) and the flow pipe and the pump (B).
Consider the flow direction of the pump!
Consider the flow direction of the pump!Consider the flow direction of the pump!
Consider the flow direction of the pump!
Turn the pump head such that the terminal head is directed to the top or to the centre of the
heating circuit.
2. Dismount and interchange the ball valves.
3. Mount the heating circuit and connect it to the installation.
4. Check all union nuts before commissioning and firmly tighten them if necessary.
5. Mount the insulation after the pressure test. Mount the thermometer handles (A-2, F-2).

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3.2.3
3.2.33.2.3
3.2.3 Check valve and non return valve [specialist]
Check valve and non return valve [specialist]Check valve and non return valve [specialist]
Check valve and non return valve [specialist]
The heating circuit is equipped with a check valve (D-1, opening pressure 200 mm wc) in the
return pipe and a non return valve (C-4, opening pressure 50 mm wc) in the mixing valve return.
They can be opened manually.
Operation
OperationOperation
Operation During operation, both marks must point to "Z" (closed).
 The check valve and the non return valve are closed.
 Flow only in the direction of the arrow
Filling, emptying, bleeding
Filling, emptying, bleedingFilling, emptying, bleeding
Filling, emptying, bleeding For filling, emptying and bleeding the mark must be
directed to "A".
 The check valve and the non return valve are open.
 Flow in both directions

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3.3
3.33.3
3.3 Optional equipment: actuator [specialist]
Optional equipment: actuator [specialist]Optional equipment: actuator [specialist]
Optional equipment: actuator [specialist]
The PAW actuator for weather-compensated control is available as an accessory. For mixing
valves with flow on the left, the scale must be turned by 180°.
for mixing valves with flow on the right for mixing valves with flow on the left
Assembly of the actuator for mixing
Assembly of the actuator for mixing Assembly of the actuator for mixing
Assembly of the actuator for mixing
valves with flow on the right:
valves with flow on the right:valves with flow on the right:
valves with flow on the right:
1. Turn the rotary knob of the mixing
valve to position 0.
2. Set the actuator to manual mode
by turning the selector switch.
3. Turn the rotary lever of the
actuator to the left to the position
shown in the figure.
4. Put the actuator onto the rotary
knob of the mixing valve and the
two stop bolts.
5. Set the actuator to automatic
mode.
Stop bo
lt

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4Assembly and installation [specialist]
Assembly and installation [specialist]Assembly and installation [specialist]
Assembly and installation [specialist]
The K35 modular heating circuit must be either installed on a set of wall bracket and mounting
plate or a modular distribution manifold. The wall bracket and the mounting plate (item no.
3422SET) or the distribution manifold are not included in delivery.
The distance between the pipe axis and the wall must be at least 10 cm, as the connection C-3
is on the back side of the mixing valve.
NOTICE
NOTICENOTICE
NOTICE
Damage to
Damage toDamage to
Damage to property!
property!property!
property!
The location of installation must be dry, load-carrying and frost-proof to prevent material
damage to the installation.
4.1
4.14.1
4.1 Accessories: compression fitting (not included in delivery)
Accessories: compression fitting (not included in delivery)Accessories: compression fitting (not included in delivery)
Accessories: compression fitting (not included in delivery)
The connection to the heating installation can be carried out fast, pressure-proof and without
soldering when you use the optionally available compression fittings.
Not included in the scope of
delivery!
1. Push the union nut ② and the cutting ring ③ onto the
copper pipe ①. The pipe must protrude at least 3 mm
from the cutting ring in order to ensure the force
transmission and the sealing.
2. Insert the support sleeve ④ into the copper pipe.
3. Insert the copper pipe with the plugged-on individual
parts (②, ③ and ④) all the way into the housing of the
compression fitting ⑤.
4. First screw the union nut ② manually.
5. Tighten the union nut ② by rotating one full turn.
Secure the housing of the compression fitting ⑤
against distort in order to avoid damaging the sealing
ring.

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4.2
4.24.2
4.2 Assembly of the heating circuit
Assembly of the heating circuitAssembly of the heating circuit
Assembly of the heating circuit
1. Mount the wall bracket with mounting
plate.
2. Take off the thermometer handles and
remove the insulating front shell of the
heating circuit.
3. Unscrew the nuts on the lower
connections of the heating circuit and
take out the sealing rings.
4. Flip the two nuts over the flanges.
5. Insert the sealing rings into the nuts.
6. Put the heating circuit onto the two
nuts.
7. Tighten the nuts. Take care that the
nuts do not get jammed and that the
sealing rings do not slip.
Flange
(top view)
Nut
1
2
3
Flange
(side view)
Sealing ring

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8. Connect the heating circuit to the
installation. The connections to the
installation must be stress-free.
① - flow from the upper part of the
storage tank
② - return to the storage tank
③ - flow from the intermediate part of the
storage tank (connection on the back of
the mixing valve)
④ - return from the consumer
⑤ - flow to the consumer
9. Connect the pump.
10. Carry out the pressure test and check
all thread connections.
11. Mount the insulating front shell and
the thermometer handles.

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5Scope of delivery [specialist]
Scope of delivery [specialist]Scope of delivery [specialist]
Scope of delivery [specialist]
Item no.
Item no.Item no.
Item no. Equipment
EquipmentEquipment
Equipment
37013 Sealing set for mixing valve
3422SET Wall bracket set (wall bracket and mounting plate)
36092KS2
Pipe set for connecting the connections on the back of the
mixing valves of two K35 modular heating circuits (for
example for assembly on a PAW distribution manifold).
36092KS3
Pipe set for connecting the connections on the back of the
mixing valves of three or more K35 modular heating
circuits

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6Technical data
Technical dataTechnical data
Technical data
K35
K35K35
K35 DN 25 (1")
DN 25 (1")DN 25 (1")
DN 25 (1")
Dimensions
DimensionsDimensions
Dimensions
Centre distance (1) 125 mm
Width insulation (2) 250 mm
Height insulation (3) 396 mm
Installation length (4) 345 mm
Connections
ConnectionsConnections
Connections
Upper connections (A-1, F-1) 1" internal thread
Lower connections (C-1, C-2) 1½" external thread
Connection on the back (C-3) 1" external thread
Technical data
Technical dataTechnical data
Technical data
Opening pressure check valve (D-1) 200 mm wc, can be opened
Opening pressure non return valve (C-4) 50 mm wc, can be opened
Materials
MaterialsMaterials
Materials
Valves and fittings Brass
Gaskets EPDM / NBR
Insulation EPP

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K35
K35K35
K35 DN 25 (1")
DN 25 (1")DN 25 (1")
DN 25 (1")
Hydraulics
HydraulicsHydraulics
Hydraulics
Maximum pressure 8 bars
Maximum temperature 110 °C
6.1
6.16.1
6.1 Pressure drop and pump characteristics
Pressure drop and pump characteristicsPressure drop and pump characteristics
Pressure drop and pump characteristics
Pressure [m wc]
Pressure [kPa]
Flow rate [l/h]
(1)
(1)(1)
(1) 100% return, Kvs value = 4.1
(2)
(2)(2)
(2) 100% low-temperature flow, Kvs value = 4.35
(3)
(3)(3)
(3) 100% high-temperature flow, Kvs value = 4.65

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PAW GmbH & Co. KG
Böcklerstraße 11
D-31789 Hameln, Germany
www.paw.eu
Phone: [phone] - 0
Fax: [phone]
9936092x – V04 2012/02