Rointe DALIS Series User manual

INSTRUCTION MANUAL
Information, operation & installation
DALIS
Digital electric unvented heat pump

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CONTENTS
1. Introduction ....................................................................................................................................... 2
2. Disclaimer ......................................................................................................................................... 3
3. Regulations ....................................................................................................................................... 3
4. Mandatory installation kits ............................................................................................................... 3
5. Safety information and warnings ..................................................................................................... 4
6. Technical information ....................................................................................................................... 6
7. Before installation ............................................................................................................................. 8
8. Installation ....................................................................................................................................... 12
9. Commissioning ............................................................................................................................... 24
10. Programming ................................................................................................................................. 25
11. Maintenance .................................................................................................................................. 39
12. Troubleshooting ..............................................................................................................................41
13. Product disposal .............................................................................................................................41
14. Guarantee conditions .................................................................................................................... 42
15. Commissioning record .................................................................................................................. 44
16. Guarantee certificate ..................................................................................................................... 45
17. Service record ............................................................................................................................... 47
1. Introduction
Thank you for choosing Rointe. The Dalis heat pump is designed to produce sanitary domestic hot
water, through the use of heat pump technology. This model consists of a compressor, evaporator,
condenser and a throttle valve. A liquid / refrigerant gas flows inside this product.
The product is manufactured from high quality components and meets all health and safety require-
ments. Before installing and / or using this product, carefully read this manual. This manual must be
kept with the product at all times, even if the ownership of the product changes.
If you have any questions on this product, please contact our Technical Support department by phon-
ing 0203 321 5929 or send an email to [e-mail].
IMPORTANT: This product has been manufactured for domestic hot water as part of a pressur-
ised water heating system. Rointe will not take responsibility for safe operation of this product
outside of the scope of intended use.
The symbol represents important information or a warning. Please read these carefully.
Please read this instruction manual carefully to ensure correct installation and operation.
It is important that the installer reads and understands these instructions and unpacks and
familiarises themselves with the equipment before commencing the installation. Failure to
observe these instructions will make the guarantee invalid.

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DALIS
Digital electric unvented heat pump
2. Disclaimer
This manual has been thoroughly verified, however in some instances non-compliance can occur.
Therefore we (Rointe) accept no liability for complete conformity.
We reserve the right to carry out modifications to the product’s construction, characteristics or its
data at any time. Therefore, we do not accept any liability claims attributable to instructions, figures,
drawings or descriptions, without prejudice to errors of any kind.
We will not be held responsible for damages attributable to incorrect installation, product misuse or
improper use, or as a consequence of unauthorised repairs, modifications or replacement.
3. Regulations
The equipment can only be installed and commissioned for use within domestic water closed heating
systems, according to the BS EN 12828 standard. It adheres to the following directives:
• Directive 2011/65/UE on use of hazardous substances in electronic equipment (RoHS).
• Directive 2014/30/UE Electromagnetic compatibility (EMC).
• Directive 2014/35/EU Low Voltage Directive (LVD).
• Directive 2009/125/CE Ecodesign requirements.
• Directive 2010/30/UE Energy labelling.
• Directive 2012/19/UE on waste electrical and electronic equipment (WEEE).
3.1. Protection degree
The product has a Protection Degree of IPX4.
3.2. Refrigerant/coolant used
The type of refrigerant used is: HFC-R134a. This device contains fluorinated greenhouse gases
included in the Kyoto protocol. Do not discard these gases into the environment. Maintenance and
disposal operations must be carried out by qualified personnel only.
4. Mandatory installation kits
IMPORTANT
As this product is an unvented domestic hot water heater, it is mandatory that it be
installed using a Rointe installation kit and by a professional with a valid Unvented
Water Heater Installer certification. The installation kits are NOT supplied with this
product. They must be purchased separately. They comply with Building Regulations
Section G3.
Please contact us on 0203 321 5929 if you have not purchased an appropriate
installation kit for this product BEFORE installation.
The T/P valve is factory fitted with the product as standard.

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Fittings supplied with installation kit (sold separately) KITW03
Expansion vessel 18 litres
(0.1 Mpa)
Tundish 15 - 22 mm
Pressure reducing valve 0.35 Mpa
Safety relief valve 0.60 Mpa
EAN CODE 8436045914354
5. Safety information and warnings
Please read this information carefully. If you have any questions, please contact us.
This symbol indicates a safety warning or a hazard of an electrical nature.
This symbol indicates general warnings of actions that could result in damage to the
product or injury to the installer/user/person.
This symbol indicates information or advice for operation of the product.
Do not open or disassemble the product when it is connected to a power supply. Isolate
all electrical supplies from the product before commencing work. Danger of electric
shock!
The maintenance of this appliance must be carried out by suitable qualified persons
only. It is recommended to maintain the product on an annual basis. Isolate all power
supplies from the product before commencing work. Danger of electric shock!
It is important that the tundish is positioned away from any electrical components.
Means for electrical disconnection must be incorporated in the fixed wiring in
accordance with wiring rules.

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DALIS
Digital electric unvented heat pump
Before removing the cover from the product isolate the appliance using the isolating
switch. Danger of electrical shock! Only use suitable electrically insulated equipment
when working inside product housing.
Do not touch the equipment when barefoot or with wet or damp body parts.
This product must only be installed and operated by competent adults. Children must
not play with the product. The product must not be cleaned, nor any maintenance
made by children.
No isolating device may be fitted between the inlet group and the cold water inlet on
the cylinder, as by doing so important safety devices could be isolated.
Do not sit on, rest anything on, move from an upright position or place anything inside
the product.
The cylinder must be filled with water before switching on. Failure to do so will damage
the heating element and the guarantee will be invalid.
The appliance should be installed in a place where it is not exposed to damp, frost or
ice and is not at risk of being splashed with water. Do not spray or pour water into the
product.
This product has not been designed, nor is it intended for use within hazardous
environments (due to the presence of potentially explosive atmospheres – according to
ATEX standards or with a requested IP level exceeding that of the product) or in
applications that require (fault-tolerant, fail-safe) safety characteristics such as in
circuit-breaking systems and/or technologies or in any other context in which the
malfunctioning of an application could cause death or injury to people or animals or
serious damage could be caused to objects or the environment.
If the product fails, it could cause damage to people or animals, or cause damage to
objects or the environment. If necessary, please provide an independent monitoring
system with alarm functions to avoid such damages.
We (Rointe) are not responsible, under any circumstances, if the product is used for
purposes other than those for which it is intended, or improper use of the product.

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6. Technical information
6.1. Construction characteristics
1 Heat pump 1.6 Kw
2 Control panel
3 ABS casing
4Steel tank (water heater) enamelled according to EN
standards (capacity: 200 / 260 litres)
5 Upper probe
6 Lower probe
7 Refrigerant recharge
8 Air recirculation fan
9 Throttle valve with double capillary tube
10 High-efficiency finned evaporator coil. Volume of
liquid deposited is regulated by a thermostatic valve.
11 Air inlet (160 mm)
12 Air outlet (160 mm)
13 Hermetically-sealed rotary compressor
14 Replaceable magnesium anode
15 Electric heating element
16 Condensation pump discharge line
17 Condensation return
18 Replaceable magnesium anode
19 Hot water outlet connection joint (G 1”)
20 Recirculation mounting (G ¾”)
21 Input coil for solar thermal power system
(G 1”1/4; 1 m2exchange surface)
22 Condensatation discharge pipe (G 1/2”)
23 Ouput coil for solar thermal power system
(G 1”1/4; 1 m2surface)
24 Cold water inlet connection joint (G 1”)
25 50 mm polyurethane insulation
26 ½”G fitting for probe immersion sleeve
27 Pressure and temperature relief valve G1/2”
Description Unit of
measure
Dalis
200DHW4
Dalis
200DHWI4
Dalis
260DHW4
Dalis
260DHWI4
Thermal power yield kW 1.6
Total thermal power kW 3.1
Heating time (1) h:m 07:16 09:44
Heating time in BOOST mode (1) h:m 03:48 04:57
Thermal losses (2) W 105 76
Dimensions (diameter x height x depth) mm 650 x 1,714 x 600 650 x 2,004 x 600
Ø mm 650 650

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DALIS
Digital electric unvented heat pump
Description Unit of
measure
Dalis
200DHW4
Dalis
200DHWI4
Dalis
260DHW4
Dalis
260DHWI4
Electrical data
Power supply V 1/N/230
Frequency Hz 50
Degree of protection - IPX4
Max. absorption kW 0.50
Average power absorption kW 0.37
Heating element + max. absorption kW 2
Power kW 1.5
Max. current A 2.3
Overload protection A
16A T fuse / 16A automatic switch, characteristic C
(to be expected during installation on power supply
systems
Internal protection - Single safety thermostat with manual reset
Functions
Temperature min. ÷ max. air intake 90% R.H. °C 4 ÷ 43
Min. ÷ max temperature installation site °C 4 ÷ 43
Working temperature
Max. programmable temperature - ECO °C 56
Max. programmable temperature - AUTO °C 70
Compressor (rotary) & fan (centrifugal)
Compressor protection - Thermal circuit breaker with automatic reset
Ejection outlet diameter mm 160
Revolutions per minute RPM 1,420
Nominal air capacity m3/h 350
Max. pressure head available Pa 100
Motor protection - Internal thermal circuit breaker with automatic reset
Condenser Wrapped externally, not in contact with water
Refrigerant R134a (load) g 900
Water storage
Capacity litres 200 260
Actual water storage capacity Vm litres 199 194 254 246
Max. volume hot water Vmax (3) litres 276 342
Connection coil solar thermal power system m2 n/a 0.9 m2n/a 0.9 m2
Cathodic protection mm 2 x Mg anode Ø33 x 250; G1 1/4”
Insulation - 50mm high density polyurethane foam
Defrosting - Passive with air
Empty weight / when filled with water Kg 81 / 280 92 / 286 93 / 347 110 / 356
Sound power indoors Lw(A) (4) dB (A) 59
Automatic anti-legionella cycle (5) - YES
Maximum working pressure bar 7
(1) temperature of incoming air supply 20°C (max.15°C), temperature of water heater storage environment 20°C, water heated from
10°C to 55°C, (according to EN 16147-2011). (2) measurements carried out according to EN 12897-2006. (3) measurements carried
out according to EN 16147-2011. (4) measurements carried out according to EN 12102-2013. (5) Automatic activation - 30 day cycle.

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7. Before installation
IMPORTANT
Failure to observe these instructions will invalidate the guarantee. Handling / instal-
lation of this product is subject to the Health & Safety At Work act. This product must
be installed by a qualified professional that is certified for Unvented Water Heater
installation. Do not attempt to install this product yourself if you are not qualified.
7.1. Handling and transport
• You must not put any type of pressure on the upper part of the device, as it is not structural in
nature. The product must be transported and handled in the upright position only. The screen
should be facing the upper side. If tipped, the centre of gravity will shift. Please handle with care.
• The equipment can only be transported horizontally during the last kilometre, taking care to
place some supports on the underside of the product in order not to lean against upper parts.
Positions allowed for transport/handling:
Positions NOT allowed for transport / handling:

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DALIS
Digital electric unvented heat pump
7.2. Packaging
• If the product is not installed immediately, it should remain in its protective packaging with all
pipe/end caps in place to prevent damage or dirt deposits.
• The equipment is supplied in a cardboard box, fixed to a pallet with screws. When removing the
screws from underneath the pallet, DO NOT tilt the product.
• Use a forklift or pallet truck to unload the equipment: these should have a load capacity of at
least 250 kg. Do not drop or lower the product suddenly.
• Unpacking the product must be carried out with care so the product does not become damaged.
Ensure all the supplied fittings have been removed from the packaging.
• Keep packaging out of reach of children. Make sure that the appliance is intact and not damaged.
If in doubt, do not use or install the product and contact us.
7.3. Location
Please adhere to the following conditions when choosing a location to install the product:
• Must be installed in a damp, frost-free environment, with containment systems in case of serious
water leaks.
• Must have structural integrity that is sufficiently robust to support the product weight when the
tank is full of water, plus a flat and level surface on which to install the product.
• Must allow access to water mains supply, hot and cold water pipework and a suitable electrical
supply.
• Be readily available for connection to condensation discharge pipe.
• Be sufficiently ventilated and illuminated (if necessary) and in a space of at least 20m3.
Figure 2 - minimum installation space

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The product MUST NOT be installed in locations where:
• The air intake contains solvents, explosive matter, grease, dirt or dust/aerosol particles.
• It is outdoors, in rooms exposed to frost, ice or damp, or in rooms where there is a lot of steam/
vapour (e.g. a bathroom).
• It is sat on floor slabs containing wooden beams e.g. attics, to avoid mechanical vibrations.
• It is prohibited to connect vented exhaust hoods to ventilation systems.
Care must be taken when installing the product in a garage or outbuilding. All exposed pipework must
be sufficiently insulated to avoid frost or ice damage.
When installing the product, ensure that all labels are visible and pipework does not restrict any work
that needs to be carried out on the various components.
Ensure the product sits flat and level on a horizontal surface as shown in figure 2.
7.4. Ventilation
The product requires adequate ventilation (see figure 3). Install air ducts ensuring each one:
• Does not weigh down the product itself and allows for maintenance work.
• Is suitably protected to avoid foreign objects or materials getting inside the product.
• Does not exceed the recommended maximum length of 6 metres (with 2 x 90º elbow junctions).
• The total maximum allowable pressure drop for all components, including feed-throughs for
mounting on an external wall, in the pipe system does not exceed 100 Pa.
Figure 3 - Air duct for model with upper outlets

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DALIS
Digital electric unvented heat pump
• During operation, the heat pump tends to lower the ambient temperature if the external air duct
is not carried out.
• An appropriate protection grid must be installed in line with the discharge pipe conveying air
to the outside, with the aim of avoiding foreign bodies from entering the equipment. In order to
guarantee maximum device performance, the grid chosen must ensure low pressure loss.
• In order to avoid the formation of condensate, insulate the air discharge pipes and the air duct
cover connections with steam-tight thermal cladding of an adequate thickness.
• If it is considered necessary in order to prevent flow noise, sound mufflers can be mounted. Fit
the pipes and connections to the heat pump with vibration damping systems.
WARNING
The simultaneous operation of an open flue firebox (e.g. an open flue fireplace) or
combustion chamber together with the product will cause a dangerous drop in am-
bient pressure. This could cause the blackflow of exhaust gas into the environment
itself.
Do not use the product with an open flue firebox or combustion chamber. Use only
sealed (approved) chamber fireboxes or combustion chambers with a separate duct
for combustion air.
Keep the doors of the room closed and hermetically sealed if they do not have a
supply of combustion air in common with inhabited areas.
7.4.1. Ventilation accessories
Suitable ventilation accessories are available on the market, which are designed for simple and
efficient heat pump water connections. See below for ventilation accessories required for successful
and correct installation:
Item Part
1Semi-rigid pipe - 160mm Ø lg 2m
290º insulated elbow - 160mm Ø
3Collars for attaching to wall
4Connectors for insulated pipe
5Horizontal terminal for insulated pipe

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8. Installation
8.1. Installation diagram
Figure 5 - installation
Water flow
Cold water inlet
CW
to tap
Hot water outlet
1
2
5
3
4
9
8
7
10
300 mm MIN
100 mm MAX
6
11
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DESCRIPTION OF INSTALLATION ITEMS
1Mains cold water supply 7Drain valve (not supplied)
2Stop cock (not supplied) 8Tundish - (supplied in mandatory installation kit,
see section 4)
3Pressure reducing valve - (supplied in mandatory
installation kit, see section 4) 9Expansion vessel - (supplied in mandatory installation kit, see section 4)
4-5 Check valve & expansion relief valve - (supplied
in mandatory installation kit, see section 4) 10 T/P relief valve (included)
6Discharge pipe 22 mm 11 Electrolytic fittings (included)
When carrying out the installation you must take care, so that:
• Extra pressure is not applied to the product e.g. by leaning on it.
• Foreign bodies and materials cannot enter inside the product.
• The selected pressure protection grid ensures low pressure loss.
• The air discharge pipes and roof connections are isolated with steam-tight thermal coating to
avoid condensation.

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DALIS
Digital electric unvented heat pump
8.2. Non-standard installations
One of the unique features of heat pump heating systems is that they create a considerable drop in
air temperature usually expelled outdoors. The expelled air, in addition to being colder than the air in
the environment, is also fully dehumidified. This means that the flow of air can be fed back inside the
building again to cool rooms or spaces during warmer months, such as the summer. A dual air outlet
pipe should be installed, with 2 dampers attached, so that the expelled air flow can be directed either
indoors or outdoors - see figure 6a and 6b.
Figure 6a - installation in summer Figure 6b - installation in winter
8.3. Cold water supply
For safe performance of the product, the tank should be directly fed by an uninterrupted supply pipe
that connects to the pressure reducing valve with a maximum supply pressure of 0.9 MPa - see figure
5. The product should not be used with a supply pressure below 0.15 MPa and a flow rate of less than
20 litres per minute. The following criteria must also be met:
• Cold water supply must come directly from the cold water mains after the mains stop valve to
the proper ty.
• The inside diameter of the cold water pipework must be at least 19mm.
• Pipework should meet the water supply regulations for wholesome water.

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8.4. Connections
8.4.1. Overall dimensions
Figure 7 - overall dimensions
Dimensions
(+/- 5mm) 200 litres model 260 litres model Dimensions (+/- 5mm) 200 litres model 260 litres model
a1,717 2,004 i1,000 1,286
b1,001 1,286 j716 931
c769 1,065 k287 287
d769 839 R1,751 2,025
e674 674 ØD 650 650
f644 644 ØDF 160 160
g287 287 M380 380
h202 202
8.4.2. Water supply connections
Connect the cold water inlet and outlet pipes to the appropriate connection points (see figure 8).

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DALIS
Digital electric unvented heat pump
Figure 8 - overall dimensions
A dirt/impurities filter must be installed in the cold water pipe inlet. The product must not operate with
a water hardness below 12ºF or hardness above 25ºF. If this is the case, then a suitably calibrated and
monitored water softener must be used.
This product is equipped with a pressure and T/P valve that complies with the BS EN 1490:2000
standard. It is factory set to operate on 7 bars pressure and a temperature of 90ºC.
The T/P safety valve for protection against over pressure and temperature must be operated regularly
to remove lime scale deposits and check it is not blocked. For more information on the T/P valve
please see section 8.9.
In case an expansion vessel is not installed, make sure that the cold water intake does not contain
any non-return valves.
WARNING
This product is capable of producing domestic hot water over 60ºC. To protect
against burns, we recommend a thermostatic mixing valve (sold separately) be in-
stalled in the hot water pipe. Also ensure there is no human burn risk at drain pipe
connecting T/P valve.
See figures 9a and 9 b for an example of a water supply connection.
No. Description Connection
1CW: cold water inlet pipe G1”
2HW: hot water outlet pipe G1”
3CD: condensation drain 1/2”
4R: recirculation pipe G 3/4”
5IS1: Solar thermal power inlet coil
OS1: Solar thermal power outlet coil G1”
6P&T: T/P valve G1/2”
7TS1: immersion sleeve probe G 1/2”
-V1 / V2: protective anodes
EE: Heating element
G1 1/4”
G1 1/2”

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Figure 9a - water supply connection
Figure 9b - T/P safety valve to drainage
1Water inlet pipe
2Shut-off valve
3Automatic thermostat mixing valve
4 Heat pump
5Recirculation pump
6Spring check valve
7Hot water outlet pipe
8Drain tap
9Expansion vessel
10 T/P safety valve
11 Inspectable end of discharge pipe

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DALIS
Digital electric unvented heat pump
8.4.3. Solar power system integration
Figure 10 - example of a solar power system integration
8.5. Pipework and taps
The pipe runs should be executed as short as possible. Unused pipework should be removed and all
remaining lagged in accordance with regulatory requirements to prevent heat loss and condensation.
All pipework connections must be made according to figure 5. A drain cock (not supplied) should be
fitted in the position shown in figure 5. All taps and fittings should have a rated operating pressure of
0.6 Mpa (bar) or above.
8.6. Pressure reducing valve
The pressure reducing valve should be installed in the cold water supply to the product, above the
tundish and pointing in the direction as shown in figure 5. The pressure reducing valve can be con-
nected to a maximum supply pressure of 0.9 Mpa.
1Cold water intake pipe
2Solar power system pump and accessories
3Solar collectors/panels
4 Heat pump
5Recirculation pump
6Spring check valve
7Drain tap
8Solar thermal power coil
9Hot water outlet pipe

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8.7. Expansion vessel
The expansion vessel is mandatory on this product and is available within the installation kit (sold
separately) described in section 2. It MUST be fitted to the safety group and positioned with the
entry point at the bottom (see figure 5). We recommend to mount the expansion vessel higher than
the water heater to avoid draining the water heater when maintaining and replacing the expansion
vessel. It is important to check the pre-charge pressure of the expansion vessel membrane before
filling the cylinder. The expansion vessel should be pressurised to 0.15 or 0.3 MPa at all times.
8.8. Expansion relief valve
The expansion relief valve must be installed between the pressure reducing valve and the product
(see figure 5). No other valve should be fitted between this valve and the cylinder. The expansion
relief valve contains a non return valve. The discharge pipework from the expansion relief valve must
be installed constantly falling to an open point of discharge. It is recommended to combine it with
the discharge of the T/P valve (see figure 5).
8.9. T/P valve
The T/P valve (temperature and pressure relief valve) is supplied factory fitted as part of the product,
to meet the requirements of the G3 building regulations. It complies with the BS EN 1490 standard.
The valve is pre-calibrated to lift at 0.7 MPa or 90ºC. The T/P valve should not be removed or modified
in any way and if done so, will render the guarantee invalid.
The outlet of the T/P valve should be routed in 15mm copper piping, in a downward direction along-
side the product to the tundish. The outlet of the expansion relief valve must be T’d into this pipe
before the tundish. This is so any water exiting either valve can drain through the tundish (see figure
11).
The T/P valve must be discharged directly or by way of a manifold via a short length of pipe (D1) into a
tundish. The discharge pipe must be installed in a continuous downward direction and in a frost free
environment. Water may drip from the discharge pipe and this pipe must be left open to the
atmosphere. The diameter of the discharge pipe (D1) should not be less than the nominal outlet size
of the safety device e.g. T/P valve.
Where a manifold is used it should be sized to accept and discharge the total discharge from all D1
discharge pipes connected.
8.10. Tundish
The tundish should be vertical and located in the same space as the product and clearly visible to
the user. It must be fitted in close proximity to the safety device and close to the electrical current
carrying the wiring. There should be no more than 600mm of pipe between the valve outlet and the
tundish (see figure 11).

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DALIS
Digital electric unvented heat pump
Figure 11 - tundish and discharge pipe
8.11. Discharge pipe arrangement (D2)
WARNING
Discharge will consist of scalding water and steam. Asphalt, roofing felt and
non-metallic rainwater goods may be damaged by such discharges.
Please see figure 11 for diagram of discharge (D2) pipe arrangement. The discharge pipe from the
tundish should:
• Terminate in a safe place, where there is no risk to persons in the vicinity of the discharge.
• Be manufactured of metal or other material that is clearly demonstrated to be capable of safely
withstanding temperatures of the water discharged.
• Be clearly and permanently labelled to identify the product and its performance standard.
• Be at least one size larger than the normal outlet size of the safety device, unless its total
hydraulic resistance exceeds that of a straight pipe 9m long, i.e. discharge pipes between 9m
and 18m equivalent resistance length should be at least two sizes larger than the normal outlet
size of the safety device, between 18m and 27m and at least three sizes larger and so on.
• Have a vertical section of pipe at least 300mm long below the tundish, before any elbows or
bends in the pipework and installed in a continuous fall.
• Have discharges visible at both the tundish and the final point of discharge. Where this is not
possible or practical, here are some examples of acceptable discharge arrangements:
- Ideally below a fixed grating and above the water seal in a trapped gully.

20
- External surfaces such as car parks, hard standings, grassed areas etc. are acceptable
providing that where children play or humans/animals otherwise come into contact with
discharges, a wire cage or similar guard is positioned to prevent contact whilst maintaining
visibility.
- Discharge at high level, e.g. into a metal hopper and metal down pipe with the end of the
discharge pipe clearly visible (tundish visible or not) or onto a roof capable of withstanding
high temperature discharges of water and 3 m from any plastic guttering system that would
collect such discharges (tundish visible).
- Where a single pipe serves a number of discharges such as in blocks of flats, the number
served should be limited to not more than six systems so that any installation discharging
can be traced reasonably easily. The single common discharge pipe should be at least one
pipe size larger than the largest individual discharge pipe to be connected. If unvented hot
water storage systems are installed where discharges from safety devices may not be appar-
ent (i.e. in dwellings occupied by blind, or disabled people), consideration should be given to
the installation of an electrically operated device to warn when discharge takes place.
IMPORTANT
Rointe do not take responsibility for any damage caused from discharges.
Figure 12 - sizing table for copper discharge (D2) pipe for common temperature relief valve outlets
Valve outlet size
(diameter, inches)
Min. size of discharge pipe
before tundish (mm)
Min. size of discharge pipe
D2 after tundish (mm)
Max. allowed length of pipe
after tundish (m)
G 1/2 15
22 9
28 18
35 27
G 3/4 22
28 9
35 18
42 27
8.11.1. Calculated example
The example below is for a 1/2” diameter temperature relief valve with a discharge pipe (D2) having
4 x 22mm elbows and a length of 7m from the tundish to the point of discharge.
The maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from a
1/2” diameter temperature relief valve is 9.0m. Subtract the resistance for 4 x no 22mm elbows at
0.8m each = 3.2m.
The maximum permitted length equates to: 5.8m, which is less than the actual length of 7m, there-
fore, calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a 1/2” diameter tempera-
ture relief valve equates to: 18m. Subtract the resistance for 4 x 28mm elbows at 1.0 each = 4m.
Therefore the maximum permitted length equates to: 14m. As the actual length is 7m, a 28mm
diameter copper pipe will be satisfactory.