Thermann TIHP 300 User manual

INSTALLATION
INSTRUCTIONS
INTEGRATED HEAT PUMP 300 L
FOR MODEL
TIHP 300
OPERATION AND

2 INSTALLATION INSTRUCTIONS

INSTALLATION INSTRUCTIONS 3
GENERAL INFORMATION
The chapter "Operaon" is intended for both the user and qualied contractors.
The chapter "Installaon" is intended for qualied contractors.
NOTE
Read these instrucons carefully before using the appliance and retain them for future reference.
Pass on the instrucons to a new user if required.
SAFETY INSTRUCTIONS
STRUCTURE OF SAFETY INSTRUCTIONS
!
KEYWORD TYPE OF RISK
Here, possible consequences are listed that may result from failure to observe the safety instrucons.
 Steps to prevent the risk are listed.
SYMBOLS, TYPE OF RISK
SYMBOL TYPE OF RISK
Injury
Electrocution
Burns
(burns, scalding)
KEYWORDS
KEYWORD MEANING
DANGER Failure to observe this information will result in serious injury or death.
WARNING Failure to observe this information may result in serious injury or death.
CAUTION Failure to observe this information may result in non-serious or minor injury.
OTHER SYMBOLS IN THIS DOCUMENTATION
NOTE
General informaon is idened by the symbol shown on the le.
 Read these texts carefully.
SYMBOL MEANING
Material losses
(appliance and consequential losses, environmental pollution)
Appliance disposal
 This symbol indicates that you have to do something. The acon you need to take is described step by step.
UNITS OF MEASUREMENT
NOTE
All measurements are given in mm unless stated otherwise.
!
!

4 INSTALLATION INSTRUCTIONS
SAFETY
INTENDED USE
The device is designed for extracng heat from the ambient air and the ulisaon of that energy for heang domesc
hot water (DHW). The DHW heat pump can be installed in the open as well as in enclosed spaces.
This appliance is intended for domesc use. It can be used safely by untrained persons. The appliance can also be
used in a non-domesc environment, e.g. in a small business, as long as it is used in the same way.
Any other use beyond that described shall be deemed inappropriate. Observaon of these instrucons and of in-
strucons for any accessories used is also part of the correct use of this appliance.
GENERAL SAFETY INSTRUCTIONS
!
WARNING INJURY
The appliance may be used by children aged 8 and up and persons with reduced physical, sensory or mental

 Children must
 

WARNING BURNS

-
-

!
MATERIAL LOSSES
The following are not permied:
-The heang of liquids other than domesc hot water.
-The installaon of the equipment in rooms where the temperature is below the freezing point.
-Operaon of the device with an empty cylinder.
NOTE
Always operate the unit with a full water tank, otherwise high pressures will develop in the refrigeraon
system, causing it to shut down. A manual reset will be necessary aerwards to restart the unit.
TEST SYMBOLS
See type plate on the appliance.
DEVICE DESCRIPTION
This device is a domesc hot water (DHW) heat pump.
It works as a DHW generator that operates automacally and has a capacity of approx. 300 l. The water temperature
is permanently set to 60 °C.
FUNCTION DESCRIPTION
The device extracts heat from the ambient air.
This energy is used to heat the water inside the cylinder. Where the device is installed inside a room, this is cooled
down through the heat extracon by approx. 1 to 3 °C. The device also extracts moisture from the ambient air that
creates condensate, which must be drained o. For this purpose, a condensate drain is integrated into the unit.

INSTALLATION INSTRUCTIONS 5
HEAT PUMP OPERATION
This is the standard operang mode, to which the limits of scope of the heat pump apply (see: Specicaon). To heat
up the cylinder capacity of approx. 300 litres of water in accordance with EN 255 part 3 to 60 °C, the device requires:
τHeat-up ϑRoom Frel ϑCold water COP (t)
10.1 h 15 °C 70 % 15 °C 3.19
5 h 42 °C 70 % 15 °C 5.61
NOTE
If the heat pump is switched OFF and ON again, for instance aer a power failure, the compressor will only
re-start (aer approx. 3 minutes), when the pressure inside the refrigerant circuit has normalised again.
OPERATION WITH ACTIVE DEFROST FEATURE
NOTE
The heat pump must not be installed in areas where ambient temperatures frequently exceed 42 °C or areas
where temperatures frequently drop below 0 °C.
Subject to the relave humidity and the DHW temperature, the evaporator begins to build up hoar frost at an am-
bient temperature of below 6 °C.
If the evaporator is covered in hoar frost, the frost monitor N2 (see wiring diagram) switches the fan OFF, whilst the
compressor connues to run, and the changeover valve V2 routes the hot gas directly to the evaporator. For this, the
condenser is shut o by changeover valve V1 (see Fig. 4). When the temperature at the evaporator ns rises above
3 °C, the fan is started again, and DHW heang connues.
The DHW heat pump can be operated at ambient temperatures as low as 0 °C. The evaporator is defrosted according
to demand in the temperature range 0 °C to +6 °C. This extends the heat-up me.
MAINTENANCE AND CLEANING
!
MATERIAL LOSSES
The sacricial anode must be checked by a qualied contractor 12 months aer the unit has been installed
and checked periodically thereaer as advised by the qualied contractor.
Failure to do so may void your warranty.
NOTE
Maintenance work, e.g. checking the electrical safety, must only be carried out by a qualied contractor.
The device is generally maintenance free, with the excepon of cleaning the condensate drain and having an author-
ised contractor check the sacricial anode.
A damp cloth is sucient for cleaning all plasc parts. Never use scouring or solvent-based cleaning agents.
-Check at least monthly the condensate drain at the middle of the unit and at the top the condensate pan drain
(visual check). Remove contaminants and blockages immediately.
-Ask your local contractor to regularly check the safety assembly and the electric booster heater.
-The device is subject to mains water pressure. The expansion water drips from the safety valve during heat-up.
Inform your local contractor of water drips from the system aer the heat-up process has ended.
-To protect the steel cylinder against corrosion, the interior is coated with a special enamel and is furthermore
equipped with a protecve anode. Ask your local contractor to check the protecve anode 12 months aer in-
stallaon and periodically thereaer as advised by your local contractor. A sacricial anode maintenance log is
located at the end of this manual for your local contractor to ll in.
-Your local contractor, who is familiar with the local water quality, should idenfy for you the ming of the next
service.

6 INSTALLATION INSTRUCTIONS
TROUBLESHOOTING
NO HOT WATER
Should you fail to obtain hot water at any me, you can take the following steps to remedy that situaon:
NO ELECTRICAL POWER
 Check the fuse/circuit breaker in your fuse box. If it has blown/tripped, replace/reset the fuse/MCB. If it should
blow/trigger repeatedly, nofy your local contractor.
STILL NO HOT WATER, EVEN THOUGH POWER IS AVAILABLE
!
MATERIAL LOSSES
The high limit safety pressure limiter must only be reset by your contractor aer he has removed the cause
of the relevant fault.
 Check, whether the air inlet/outlet is blocked.
The thermoswitch trips out or the high limit safety pressure limiter switches the compressor OFF if the compressor
is overloaded due to excessive ambient temperature or excessive air temperature (>42 °C), or because of a fault in
the refrigerant circuit. Ask your local contractor to remove the fault.
Aer a short cooldown phase, the thermoswitch will restart the compressor automacally.
OTHER ISSUES
SAFETY VALVE OF THE COLD WATER SUPPLY LINE DRIPS
This may occur during the heat-up phase and is completely normal.
THE CONDENSATE DRAIN DRIPS
This always happens when the surface temperature of the evaporator is lower than the ambient dew point temper-
ature.
If you cannot remedy the fault, nofy your qualied contractor.
Type: TIHP300
Heat pump:
PN (Air 42°/ Water 60°):
IN (Air 42°/ Water 60°):
Type of Refrigerant:
Refrigerant charge:
Max. operating pressure:
DHW-cylinder:
Max. operating pressure:
Max. operating temperature:
Type of cylinder material:
Cylinder capacity:
Observe the installation manual!
Made in Germany
Voltage / Frequency:
Fuse:
PNmax (rated power input):
Limits for heat pump operation:
Protection class:
1/N/PE~240 V,
50/60 Hz
1 x 16 A
0,7 kW
0 °C / +42 °C
IP 24
*233892887501923400*
*233892887501923400*
No.: 233892-8875-019234
700kPa
76 °C
St em
300 l
0.5 kW
2.17 A
R134a
900 g
2,4 MPa
*233892887501923400*
282209-37727
STA222422-019234
Tested for leaks!
TM
To facilitate and speed up your request, provide the serial number from the type plate (xxxxxx-xxxx-xxxxxx).
REGULATIONS AND STANDARDS
-The installaon (water and electrical work) and commissioning, as well as the maintenance of this equipment,
must only be carried out by an authorised qualied contractor in accordance with these instrucons.
-Perfect funcon and safe operaon can only be assured when using original accessories and spare parts intend-
ed for this equipment.
-DIN VDE 0100 / DIN VDE 0701
-Regulaons of your local electricity supply ulity
-DIN 1988 / DIN 4109
-Regulaons of your local water supply ulity

INSTALLATION INSTRUCTIONS 7

-AS 4234, AS 3498, AS 4020, AS 1056.1
-AS/NZS 2712, AS/NZS 3350.2.40/30/30.2
-IEC 60335-1-2-40, IEC 61000-3-2; 1995
-IEC 61000-3-3, IEC 55014-1 IEC 55014-2
-EMC Direcve 89/336/EEC
-EN 255 T3

-The equipment type plate
-The specicaon
-Water installaon: Observe the AS/NZS 3500 [local regulaons]
-Material of the cold water line: Steel, copper or plasc pipe systems.
-Material of the hot water line: Copper or plasc pipe systems.
OVERVIEW
DHW
Cold Water
48°
30°
26_03_13_0015
10 12
11
68
9
8
7
3
1
2
5
4
5
3
13
1 Cold water supply G 1 (G ¾ female with adapter)
2 Hot water connecon G 1 (G ¾ female with adapter)
3 Condensate drain G ¾ hose connecon (20 mm
male)
4 Connecon for P&T relief valve G ¾ (on-site)
5 Electrical cable (without plug)
6 Drain valve (on-site)
7 Expansion control valve (if required*, on-site)
8 Straight-through shut-o valve (on-site)
9 Pressure gauge test connector ** (on-site)
10 Non-return valve (on-site)
11 Test valve connecon **
12 Pressure reducing valve (on-site)
13 Condensate spillover
* Not all local regulaons mandate the use of an ex-
pansion control valve (ECV).
** Oponal, depending on installaon requirements

8 INSTALLATION INSTRUCTIONS
TRANSPORT
!
MATERIAL LOSSES
It is vital that the following transport informaon is observed to ensure the appliance is transported safely.
NOTE
We recommend transporng the appliance in a vercal posion.
 Transport the appliance in its packaging to protect it against damage.
 Transport the appliance in an upright posion.
TRANSPORT IN A HORIZONTAL POSITION
The appliance can also be transported horizontally over short distances on good roads. Observe the following in-
formaon:
-Ensure that no pressure is applied to the packaging.
-Even in its packaging, never place other devices or objects on the appliance.
POSITION OF THE AIR INTAKE SIDE
The air intake side of the appliance is idened on the packaging with a label.
 Ensure that the air intake side of the appliance is facing downwards if the appliance is transported horizontally.
INSTALLATION
MINIMUM CLEARANCES
≥ 400
≥ 400
≥ 400
≥ 100
670
26_03_01_1618
POSITIONING
!
MATERIAL LOSSES
Ensure that the casing panel in the lower area of the device is not damaged during posioning.
D0000040883
1

INSTALLATION INSTRUCTIONS 9
1 Feet with locking nut
 Posion the device in the installaon locaon.
 Remove packing straps and polystyrene mouldings.
 Level the device by adjusng the equipment feet.
 Aer leveling the device x the nut of the rubber feet to provide a maximum of structural safety.
EXTERNAL INSTALLATION
!
MATERIAL LOSSES
The heat pump must not be installed in areas where ambient temperatures frequently exceed 42 °C or areas
where temperatures frequently drop below 0 °C.
!
MATERIAL LOSSES
Installaon locaons with aggressive air (e.g. air loaded with ammonia, chlorine, metals, oil, ...) are inadmis-
sible because they can cause damage to the device.
Where possible select an installaon locaon that has limited exposure to extreme rain or snow.
Mount the unit so that it is not exposed to direct strong wind, but is well venlated. The air inlet and outlet
must be free. Protect your device with possibly a canopy, a base and baes to weather.
The locaTion where The device is To be insTalled musT meeT The following condiTions:
-Load-bearing oor (wet weight of the device approx. 430 kg).
-Never operate the device in rooms at a risk from explosion due to dust, gases or vapours.
-It is preferred that the locaon of the unit is not near a bedroom or a neighbour's bedroom. Ideally a unit may
be mounted near a kitchen or laundry. Opposite a neighbours garage is always preerred.
-The water heater should be located as close as possible to the most frequently used hot water tap connecon.
-Ensure that the data plate is clearly visible.
-Ensure that the ambient temperature lies within the applicaon limits for heat pump operaon.
INTERNAL INSTALLATION
!
MATERIAL LOSSES
The heat pump must not be installed in areas where ambient temperatures frequently exceed 42 °C or areas
where temperatures frequently drop below 0 °C.
!
MATERIAL LOSSES
When installing the heat pump in a boiler room, ensure that the boiler operaon will not be impaired.
!
MATERIAL LOSSES
Do not place the device near high frequency machines.
The room where The device is To be insTalled musT meeT The following condiTions:
-Load-bearing oor (wet weight of the device approx. 430 kg).
-Never operate the device in rooms at a risk from explosion due to dust, gases or vapours.
-Include in your consideraons the ulisaon of waste heat, for example from a boiler, tumble drier or
refrigerator/freezer.
-The available oor area in the installaon room must be at least 6 m². Never install this equipment in rooms
with a volume of less than 13 m³.
-Never restrict the clearances of the device through walls and ceilings further than illustrated in the gure
below.
-In case of indoor installaon and min. installaon room volume, the room temperature might be reduced by
approx. 1-3 °C through the heat pump operaon. The inial temperature is reached again approx. ½ h aer the
heat pump has been switched OFF.

10 INSTALLATION INSTRUCTIONS
UNPACKING THE WATER HEATER
NOTE
Ensure that the casing material in the lower secon will not be damaged.
NOTE
The longer you keep the packaging foil wrapped around the water heater, the longer it will be protected
against damage.
 Remove the packaging straps.
 Push the packaging foil far enough upwards that the pallet is freely accessible.
 Remove the water heater carefully with the polystyrene® packaging from the pallet.
!
WARNING INJURY


D0000040884
 Slide the packaging foil far enough upwards to be able to remove the rst polystyrene® proles from the sides.
These polystyrene® proles on the sides are used as installaon aids in the following steps.

INSTALLATION INSTRUCTIONS 11
26_03_01_1395
 Ensure that all packaging is removed other than the base as illustrated.
 Separate the lower packaging secon at the dividing line. For this, make an incision of approx. 30 mm (1.25”)
into both sides of the dividing line.
!
WARNING INJURY

26_03_01_1396
 Slightly lt the water heater.
 Push a wooden support underneath the lower part of the packaging.
 Break out the free semi-shell of the lower secon of the packaging.

12 INSTALLATION INSTRUCTIONS
1.
2.
3.
26_03_01_1387
 Keep the water heater slightly lted.
 Wind out the free leveling foot, but not by more than 30 mm (1.1”).
 Turn the locking nut on the thread of the leveling foot towards the boom cover. When the locking nut is ght
against the boom cover, it stabilizes the leveling foot.
26_03_01_1384
 Push two polystyrene® installaon aids with the step-shaped corner underneath the water heater. The water
heater is subsequently set and lted onto this prole. Ensure that you do not set the water heater down in the
area of the joint edge of the sheet steel jacket, but at least 150 mm (6”) along.

INSTALLATION INSTRUCTIONS 13
26_03_01_1388
 Tilt the water heater that has been set down on the polystyrene® installaon aids.
 Remove the remaining oor semi-shell.
 In the lted state of the water heater, wind out the second and third leveling foot, but not by
more than 30 mm (1.1”).
 In both cases, ghten the locking nut against the boom cover.
 Posion the water heater on the three leveling feet.
 Level the water heater vercally by adjusng the three leveling feet.
 Remove any packaging that remains on the water heater.
REMOVING THE TRANSPORT LOCK
There is a two-part transport lock aached to the heat pump unit of the appliance. The transport lock must be re-
moved before the appliance is installed.
NOTE
In its delivered condion, the appliance cover is held in place with only 4 screws.
The remaining screws for the appliance cover can be found in a plasc bag supplied with the appliance, in
the lower secon of the appliance packaging.
 Undo the 4 screws in the appliance cover and remove the cover to open the appliance.
 Remove the noce about secure transport which is xed between the appliance casing and cover.

14 INSTALLATION INSTRUCTIONS
26_03_01_1879
1
2
3
1 Transport lock part I
2 Transport lock part II
3 Air intake
 Carefully remove transport lock part II by pulling it gently out of the spring of transport lock part I.
 Remove transport lock part I.
 Ensure that there is no packaging le in the appliance.
 Check the heat pump unit for transport damage.
!
MATERIAL LOSSES
Never commission the appliance immediately aer removing the transport lock.
 Fill tank with water.
 Wait at least 1 hour before commissioning the appliance.
 Posion the appliance cover on the appliance and secure it with the screws supplied.

INSTALLATION INSTRUCTIONS 15
WATER CONNECTION
26_03_01_1403
4
6
3
1
15
14
13
11
10 9
8
7
12
5
2
1 Capacitor
2 Electrical cable
3 Strain relief
4 Power terminals
5 Frost monitor
6 Heat pump control thermostat
7 Fan
8 Heat pump terminal
9 Protecve anode (maintenance required)
10 Solenoid valve V1
11 Safety high pressure limit
12 Condensate pan drain (maintenance required)
13 High press. compress.
14 Compressor motor protecon (Klixon)
15 Solenoid valve V2
WARNING BURNS





!
MATERIAL LOSSES
To protect against the risk of corrosion, make the connecon as at packing seal. The use of hemp, teon,
or thread seal tape on connecons is not acceptable.
!
MATERIAL LOSSES
Supply and drain pipe sizes should be equal to safety valve sizes. The drain outlet must not be able to be
closed and must always remain open to atmosphere.
 Size the drain so that water can drain o, even if the safety valve has been fully opened.
 Remove the protecve caps (white discs) from the connectors.
 With a sharp knife, cut an “X” into the protecve caps and invert over the pipe to be connected.
 Connect the pipe and ret the protecve caps.
 Insulate the DHW line in accordance with local regulaons.
 Accurately maintain the order of ngs on the cold water side.
 Flush the line prior to installaon.

16 INSTALLATION INSTRUCTIONS
 Install a drain valve at the lowest point of the cold water supply inlet for future maintenance of the tank.
 Install a 700 kPa pressure and temperature relief valve (PTRV).
 Observe the requirements for expansion control valve (ECV) . In such case, use a 550 kPa valve.
 A pressure reducon valve (PRV) must be ed and adjusted to a maximum of 500 kPa. If the ECV is required,
set PRV to a maximum of 420 kPa
CONDENSATE DRAIN
< 889 (35“)
26_03_01_1127
1
2
3
4
5
6
1 Condensate drain elbow or
2 Drain pan connected to drain
3 T&P valve
4 Cold water connecon
5 Hot water connecon
6 Condensate spillover
 Install the condensate drain elbow.
 When installing the unit outdoors, the condensate can drain o freely.
 For indoor installaon, the condensate can be routed into a oor drain or routed through the wall up to
889 mm (35”) (see diagram above).
 If required, install a condensate pump.
NOTE
To ensure the condensate drains correctly, never kink the hose
POWER SUPPLY
WARNING ELECTROCUTION
 
-Only qualied electricians must carry out the installaon in accordance with these instrucons.
-Observe VDE 0100 [or local regulaons] and the regulaons of your local power supply ulity.
-The appliance is intended to be permanently connected to xed wiring. For the connecon to the power supply
the ed supply cord has to be used.
-The DHW heat pump must be able to be separated from the mains power supply by an addional isolator,
which disconnects all poles with at least 3 mm contact separaon. For this purpose, use contactors, mains iso-
lators, fuses, etc. on site.
-Terminals are located inside the control panel and become accessible by removing the equipment lid and the
cover of the wiring chamber).

INSTALLATION INSTRUCTIONS 17
COMMISSIONING
!
MATERIAL LOSSES
Never operate the equipment outside the temperature range 0 °C to + 42 °C.
NOTE
At temperatures below - 10 °C (e.g. transport/storage), the safety temperature cut-out may respond. Press
the reset buon aer the temperature is much higher than -10 °C.
Only approved contractors may commission this equipment and instruct the owner in its use.
 Fill, vent and thoroughly ush the device.
 Check the safety assembly.
Inform the user that water may drip from the safety valve whilst the water is being heated up.
 Switch ON the power supply
SAFETY EQUPMENT AND MAINTENANCE
Only qualied contractors must carry out the installaon in accordance with these instrucons.
WARNING ELECTROCUTION


NOTE
You may remove the air intake grille if there is not enough room for maintenance work above the appliance
even aer its cover has been removed (Refer chapter “Installaon”, secon “Minimum clearances”for min-
imum clearance area).
The air intake grille is secured with spring nuts. The inside of the air intake grille features an all-round ad-
hesive sealing strip.
 Never remove the sealing strip.
 Always use the spring nuts during reassembly.
 Ret the air intake grille aer compleng the maintenance and repair work.
26_03_01_1877
1
1 Removeable air intake grille with an all-around adhesive sealing strip on the inside

18 INSTALLATION INSTRUCTIONS
26_03_01_1878
CLEANING THE EVAPORATOR
!
WARNING INJURY
Th

Maintaining the full output of the water heater at all mes requires an occasional professional cleaning of the evap-
orator.
 Undo the screws that connect the water heater cover and remove.
 Carefully clean the evaporator ns. Only use water and a so brush. Never use acidic or alkaline cleaning
agents.
ON THE EQUIPMENT
WARNING ELECTROCUTION
 
In case of a fault, the safety equipment of the device interrupts the relevant power circuit.

The safety high pressure limiter shuts down the compressor, if the pressure inside the refrigerant circuit exceeds the
permissible maximum value. The safety high pressure limiter may also respond, if the appliance is operated above
its permissible limit (>42 °C air temperature) or the control thermostat of the heat pump fails to respond. Reset the
high pressure limit safety cut-out by pressing the reset buon, aer the cause of the fault has been removed.
PROTECTIVE MOTOR THERMOSWITCH
The protecve motor switch will shut down the compressor, if it is overloaded because of excessive thermal load.
Remove the relevant fault. Aer a short cool-down phase, the protecve motor switch restarts the compressor
automacally.

INSTALLATION INSTRUCTIONS 19
PROTECTIVE ANODE
NOTE
The sacricial anode must be checked by a qualied contractor 12 months aer the unit has been installed
and checked periodically thereaer as advised by the qualied contractor. Failure to do so may void your
warranty.
An anode for the protecon of the DHW cylinder is inserted centrally from the top into the DHW cylinder of the
appliance. The anode ed at the factory (anode rod) is approximately 1.26 m long.
 Replace the anode with a new one if the installed one has been consumed.
A cap over the anode terminal prevent the ingress of water between the anode terminal and the condensate pan.
 Remove the cap if you need to remove the anode.
When installing the anode, ensure that the metallic conductor connecon is correctly made. It's recommended for
rst anode inspecon to happen one year aer installaon.
Consult with your water specialist, or contractor, for the opmum ming for inspecons thereaer. Should it be
impossible to insert a rod anode, you may have a sectional anode installed instead. In areas where total dissolved solids
(TDS) in the water is outside the range 40-400 mg/l, the magnesium alloy anode supplied, M2, must be replaced. Use a
high potential, M1, anode if TDS<40 or an aluminium A5 alloy anode if TDS>400, before installing the unit.
 Push the cap back over the anode terminal.
 Fill in sacricial anode replacement log.
CLEANING THE EVAPORATOR
!
WARNING INJURY
The evaporator has many sharp-edged ns. When cleaning the evaporator, proceed with cauon and wear
protecve clothing, in parcular safety gloves.
Maintaining the full output of the device requires an occasional professional cleaning of the evaporator. Clean the
evaporator only with water and a brush. Never use acidic or alkaline cleaning soluons.
DRAINING THE CYLINDER
!
WARNING INJURY
Hot water can be expelled during draining.
 Close the shut-o valve in the cold water supply.
 Fully open the hot taps at all draw-o points.
 The cylinder is drained via the cold water inlet line. Open the drain valve. If no drain valve was installed, undo
the ng on the cold water supply of the appliance. Residual water remains in the lower part of the cylinder.
ON THE SYSTEM
!
MATERIAL LOSSES
If the hot water unit is not used for two or more weeks, an amount of highly flammable hydrogen gas may accu-
mulate in the water tank. To dissipate this gas safely, it is recommended that a hot tap be turned on for several
minutes or until discharge of gas ceases. Use a sink, basin or bath outlet, but not a dishwasher, clothes washer
or other appliance. During this procedure, there must be no smoking, open flame or any electrical appliance
operating nearby. If hydrogen is discharged through the tap, it will probably make an unusual sound as with
air escaping.

This valve opens when the water pressure exceeds the preset value of 0.7 MPa thereby relieving the pressure. It
is adjusted so that no water will be expelled when heang is switched OFF. Should it connue to drip excessively,
either the valve seat has become contaminated, the water pressure is too high or the pressure reducing valve has
become faulty.

 Check the valve for perfect funcon. Replace it, if required.

20 INSTALLATION INSTRUCTIONS
REGULAR VALVE MAINTENANCE
Safety requires that valves are regularly checked for perfect funcon.
 Regularly vent the safety valve unl a full stream of water ows from it. Close the safety valve aer checking.
How quickly limescale builds up depends on the local water quality.
 As your local contractor is familiar with your local water quality, let him determine the ming of this check.
SPECIFICATION
DIMENSIONS AND CONNECTIONS
1840
30-60
670
1638
185
1267
b01 g02
g01
c01
c06
c13
d45 d43
30°
12°
16°
D0000018053
TIHP 300
b01 Entry electrical cables
c01 Cold water inlet Male thread G 1
c06 DHW outlet Male thread G 1
c13 T&P valve Female thread G 3/4
d43 Condensate overflow
d45 Condensate drain Male thread G 3/4
g01 Air intake
g02 Air discharge