Valeo spheros thermo 230 Instruction manual

Rev. 05/2017
Id.No. 9003656C
Thermo 230
Thermo 300
Thermo 350
with control unit 1572
model .30 and up
Thermo 230
Thermo 300
Thermo 350
with control unit 1572D
model .30 and up
Thermo 231
Thermo 301
model .01 and up
Thermo Rail
Workshop Manual
HEATING SYSTEMS

I
Thermo 230 / 231 / 300 / 301 / 350 1 Table of Contents
Table of contents
1 Introduction 101
1.1 Content and purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.2 Effectivity of the workshop manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.3 Meaning of highlighted content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.4 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.5 Further documentation to be used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.6 Safety information and regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.6.1 General safety regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
1.7 Suggestions for improvement and change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
2 General Description 201
2.1 Combustion Air Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
2.2 Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
2.2.1 Nozzle block preheater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.3 Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.4 Combustion Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.5 Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.6 Flame Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.7 Igniter Box with Igniter Electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
2.8 Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
2.9 Temperature Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
2.10 Overheat Thermostat for burner (Thermo 231 and 301 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
2.11 Circulation Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
2.11.1 Aquavent 5000 (U4814) and Aquavent 5000S (U4854) circulating pumps . . . . . . . . . 205
2.11.2 Aquavent 6000C (U4855) and Aquavent 6000SC (U4856) circulating pumps . . . . . . 205
2.12 Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
3 Functional Description 301
3.1 Switch On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
3.2 Heating Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
3.3 Switch Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
3.4 Power Save . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
3.5 Auxiliary Heating Operation (heaters with control unit 1572D only) . . . . . . . . . . . . . . . . . . . . . . 303
3.6 Heater Lockout (heaters with control unit 1572D only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
3.7 Switch-off upon Failure (heaters with control unit 1572) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
3.8 Switch-off upon Failure (heaters with control unit 1572D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
3.9 Error Code Output (heaters with control unit 1572D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
4 Technical Data 401
4.1 Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401
4.2 Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401
5 Troubleshooting 501
5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
5.2 General Fault Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
5.3 Fault Symptoms during Functional Checkouts and Error Code Output or Tests with
Diagnostic Computer, Components Tester or PC Heater Diagnosis . . . . . . . . . . . . . . . . . . . . . . 503
5.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
5.3.2 Fault Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504

II
Thermo 230 / 231 / 300 / 301 / 350 1 Table of Contents
6 Functional Checkouts 601
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601
6.2 Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601
6.2.1 Adjustment of CO2 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601
6.3 Components Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602
6.3.1 Temperature Sensor Resistance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602
6.3.2 Flame Sensor Resistance Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602
6.3.3 Igniter Electrodes Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602
6.3.4 Igniter Box Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602
6.3.5 Fuel Pump Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603
6.3.6 Fan Motor Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604
6.3.7 Solenoid Valve Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604
6.3.8 Nozzle Block Preheater Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604
7 Circuit Diagrams 701
7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701
8 Servicing 801
8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801
8.2 Heater Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801
8.3 Vehicle Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801
8.4 Heater Test Run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801
8.5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801
8.5.1 Inspection and Attachment of the Exhaust Muffler (only heaters from
year of production 1996 and up to production date 1996, calendar week 36; 3G......) . 801
8.5.2 Burner Head Opening and Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 803
8.6 Visual Inspections and Regulations for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 804
8.6.1 Connection to Vehicle Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 804
8.6.2 Connection to Vehicle Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 804
8.6.3 Combustion Air Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 806
8.6.4 Exhaust Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807
8.7 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807
8.7.1 Heater, Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807
8.7.2 Temperature Limiter, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807
8.7.3 Temperature Sensor, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 807
8.7.4 Burner, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
8.7.5 Igniter Box, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
8.7.6 Flame Sensor, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
8.7.7 Combustion Chamber, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
8.8 First Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
8.8.1 Water Circuit, Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 808
8.8.2 Fuel Supply System, Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 809
9 Repair 901
9.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 901
9.1.1 Work on Components after Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 902
9.1.2 Incorporation of Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 902
9.2 Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904
9.2.1 Temperature Limiter, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904
9.2.2 Temperature Sensor, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904
9.2.3 Burner, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904
9.2.4 Combustion Air Fan, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906
9.2.5 Control Unit, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908
9.2.6 Fuel Pump, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908

III
Thermo 230 / 231 / 300 / 301 / 350 1 Table of Contents
9.2.7 High Pressure Nozzle, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908
9.2.8 Igniter Box, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908
9.2.9 Flame Sensor, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 910
9.2.10 Heat Exchanger, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912
9.2.11 Combustion Chamber, Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912
10 Packaging, Storage and
Shipping 1001
10.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001
Appendix
Periodic heater maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

101
Thermo 230 / 231 / 300 / 301 / 350 1 Introduction
1Introduction
1.1 Content and purpose
This workshop manual is used during maintenance and
repair of water heaters (further referred to as heaters)
Thermo 230, 231, 300, 301 and 350.
ATTENTION:
Work on the heater may only be performed by briefed
and/or trained by Spheros personnel.
1.2 Effectivity of the workshop manual
The workshop manual applies to heaters listed on the title
page of this document.
It may be subjected to modifications and amendments.
The respectively currently effectife version is binding. This
version can be found on the Spheros homepage under
Service/Downloads/Heating systems.
1.3 Meaning of highlighted content
Throughout this manual the emphasized words Warning!,
Caution!, ATTENTION: and NOTE: used as follows:
This caption is used to indicate possible severe inju-
ries or fatal accidents if instructions or procedures
are carried out incorrectly or entirely disregarded.
This caption is used to indicate possible minor inju-
ries if instructions or procedures are carried out
incorrectly or entirely disregarded.
ATTENTION:
This caption points to actions which may cause ma-
terial damage.
NOTE:
This caption is used to draw attention to an important
feature.
1.4 Symbols
1.5 Further documentation to be used
The use of additional service literature is required.
References are provided in the workshop manual at
appropriate locations.
Use the following documents during operation and main-
tenance of the heaters:
• Operating and Service Instructions
• Installation Instructions
• Technical Information (TI)
• Spare Parts List
1.6 Safety information and regulations
Basically, general accident pevention provisions and the
valid industrial safety directions must be adhered to.
"General Safety Regulations" which exceed the frame-
work of these provisions are listed below.
The specific safety regulations which affect the present
manual are issued highlighted in the individual sections or
procedures.
1.6.1 General safety regulations
Read the Thermo Operating and Service Instructions
before operating the heater for first time.
Familiarize yourself with the Thermo Installation
Instructions before you make any modifications to the
existing heater installation.
NOTE:
The Thermo Operating and Service Instructions contain
safety instructions and regulations to be followed for safe
operation of the heater.
The Thermo Installation Instructions contain the statutory
regulations and other safety hints and regulations for the
proper installation of the heater.
Danger to life and health!
Warning!
Hazardous to health!
Caution!
Symbol tightening torque value:
Identifies in graphics parts (eg nuts, bolts)
that are to be mounted with a specific tigh-
tening torque. The torque values are shown
at the symbol and are binding.
Danger to life and health!
Warning!

102
Thermo 230 / 231 / 300 / 301 / 350 1 Introduction
1.7 Suggestions for improvement and
change
Please direct any complaints, improvement or modifica-
tion suggestions regarding this manual to:
[e-mail]

201
Thermo 230 / 231 / 300 / 301 / 350 2 General Description
2 General Description
The water heaters Spheros Thermo 230, 231, 300, 301
and 350 are used in combination with the vehicle’s own
heating installation to
– heat the passenger compartment
– defrost the windscreen
– preheat water-cooled engines
The heaters Thermo 231 and 301 are variants for vertical
installation. The difference in appearance are the different
identification label and the Z profiles on the installation in-
terface.
The water heater operates independent from the vehicle
engine and is connected to the vehicle cooling system,
the fuel system and the electrical system.
The heater designed to the heat exchanging principle
operates intermittently controlled by the temperature
sensor.
The heaters Thermo 230, 231, 300, 301 and 350 basically
consist of
– the combustion air fan
– the fuel pump with nozzle block and nozzle
– the heat exchanger and
– the combustion chamber
– the igniter box with igniter electrodes
For control and monitoring the heater includes
– a control unit
– a flame sensor
– a temperature sensor
– a temperature limiter
– a temperature limiter without reset button for Thermo
231 and 301 and the Rail variant .126.
An external circulating pump is installed inside the vehicle,
or, in the case of compact units, directly at the heater.
5
6
7
8
9
10
1
2
4
3
11
Thermo 231/301
Thermo 231/301
1 Burner
2 Coolant inlet
3 Temperature limiter
4 Temperature sensor
5 Coolant outlet
6 Heat exchanger
7 Exhaust outlet
8 Fuel return
9 Combustion air inlet
10 Fuel delivery
11 Splash protection cover
(instead of screen)

202
Thermo 230 / 231 / 300 / 301 / 350 2 General Description
2.1 Combustion Air Fan
The combustion air fan supplies the air required for
combustion from the combustion air inlet to the combus-
tion chamber.
The fan consists of a fan motor with fan wheel. Air is taken
in through a splash protection cover or a screen and the
cap. The heaters Thermo 231 and 301 are provided with
a splash protection cover only.
2.2 Fuel Pump
The fuel pump is responsible for fuel supply.
The pump is driven by the burner motor via a coupling.
Fuel is compressed in the fuel pump to approx. 10 bar and
atomised via the atomiser nozzle.
The solenoid valve integrated into the fuel pump opens
and closes the fuel supply to the atomiser nozzle.
Three different fuel pumps are assigned to the different
heating capacity classes of the Thermo series.
These are identified by the heating capacity class
specification as well as colour dots:
• 16 KW: 1 color dot
• 23-35 KW: 2 color dots
• 40 KW: 3 color dots
The fuel pump can be used in dual-line operation (fuel
supply and return line).
If the heater is operated with
– a long fuel supply line
– check valves in the fuel supply and return line
– a fuel filter in the fuel supply line
– single-line operation
the fuel supply line must be filled prior to first heater
start-up.
Nozzle block
pre-heater (optional)
Solenoid valve
Fuel Pump
Screen
O-ring
Color dots for
identification
of the heating
capacity class
Fan motor
Fan wheel
Cap
Splash protection cover
Screen

203
Thermo 230 / 231 / 300 / 301 / 350 2 General Description
2.2.1 Nozzle block preheater
At extremely low temperatures malfunctions may occur
without a nozzle block preheater.
At a temperature of < 0°C a thermostat activates the
heater cartridge in the nozzle block. The heating period
depends on the heat reflected within the combustion
chamber. Preheating is deactivated when the thermostat
ambient temperature is +8°C.
If the heater is not equipped with a nozzle block preheater
a retrofit is possible.
2.3 Heat Exchanger
IThe heat exchanger transfers the heat generated by
com-bustion to the coolant circuit.
2.4 Combustion Chamber
The fuel/air mix is dispersed in the combustion chamber
for combustion to heat the heat exchanger.
2.5 Control Unit
The control unit 1572 or 1572D is the central component
to ensure controlled operation and monitoring of
combustion. If the heater has a control unit 1572 installed,
a retrofit of control unit 1572D is possible (see Section 9).
2.6 Flame Sensor
The flame sensor continuously monitors the flame
condition during operation. The flame sensor is a photo
transistor changing its resistance depending on the flame
intensity. The signals are supplied to the control unit for
processing.
2.7 Igniter Box with Igniter Electrodes
The igniter box generates the high voltage for igniting the
fuel/air mix by a high voltage ignition spark across the
electrodes.
Heat exchanger
Combustion chamber
Control Unit 1572
Control Unit 1572D
Flame sensor

204
Thermo 230 / 231 / 300 / 301 / 350 2 General Description
2.8 Temperature Sensor
The temperature sensor senses the coolant temperature
at the heat exchanger outlet as an electrical resistance.
This signal is supplied to the control unit for processing.
2.9 Temperature Limiter
The temperature limiter (bimetal) protects the heater
against undue high operating temperatures.
The temperature limiter can be reset manually.
The temperature limiter responds at a temperature in
excess of 125°C to switch off the heater.
In the case of Thermo 231 and 301 as well as the Rail
variant .126, the temperature limiter will trip at a
temperature in excess of 105°C.
After the temperature has dropped, an automatic reset will
occur.
2.10 Overheat Thermostat for burner
(Thermo 231 and 301 only)
The overheat thermostat is screwed onto the disk and
electrically connected to the solenoid valve of the fuel
pump. When the burner overheats the thermostat causes
an error lockout.
2.11 Circulation Pump
The externally mounted circulation pump ensures proper
coolant circulation in the vehicle and heater circuit.
Depending on the application, the circulating pump is
switched on via the control unit or directly via the vehicle
electrical system and operated during the entire heater
operation duration.
The heaters can be operated with the circulation pumps
Aquavent 5000 (U4814), Aquavent 5000S (U4854),
Aquavent 6000C (U4855) or Aquavent 6000SC (U4856).
The circulating pump fuse may never be pulled, while the
pump is running, and may not be replaced, when the
pump is switched on.
Igniter electrodes
Igniter Box
Temperature sensor
Temperature
limiter
Circulating pump Delivery rate Rated voltage Operating voltage range Rated power consumption Weight
l/h V = V = W kg
U 4814
Aquavent
5000
5000
(against 0,2 bar)
12
or
24
10…14
or
20…28
104 2,1
U 4854
Aquavent
5000S
5000
(against 0,2 bar)
24 20…28 104 2,2
U 4855
Aquavent
6000C
6000
(against 0,4 bar)
24 20…28 210 2,4
U 4856
Aquavent
6000SC
6000
(against 0,4 bar)
24 20…28 210 2,5
Overheat Thermostat