Rointe D SERIES User manual

Instruction Manual
Assembly, installation, start-up
and operating instructions
D Series with
Water Heater
DELTA Ultimate
technology

Many thanks for your confidence in our Rointe products. Before
you start to use the low-consumption digital electrical D Series
with Delta Ultimate technology water heater we recommend that
you read this manual carefully in order to use the product correctly
with the maximum guaranteed results.
Thank you.

3
INDEX OF CONTENTS
1. INTRODUCTION ......................................................................................4
2. TECHNICAL ESPECIFICATIONS .............................................................4
3. GENERAL REQUIREMENTS ...................................................................8
4. PLUMBING INSTALLATIONS.................................................................11
5. ELECTRICAL INSTALLATION ................................................................19
6. FILLING AND COMMISSIONING...........................................................22
7. DESCRIPTION OF THE D SERIES WATER HEATER .............................23
7.1. Description of the front panel .......................................................24
7.2. Switch On and Off (Stand By) ......................................................26
7.3. Select Temperature........................................................................27
7.4. Lock the Control Panel .................................................................27
7.5. Adjust Date and Time ...................................................................28
7.6. Main Menu ...................................................................................29
8. ADVANCED FUNCTIONALITY ..............................................................43
9. FUZZY LOGIC ENERGY CONTROL .....................................................44
10. RECOMMENDATIONS ........................................................................44
11. SERVICING AND MAINTENANCE ......................................................45
12. FOULDT FINDING ...............................................................................47
13. GUARANTEE .......................................................................................48
14. INSTALLATION, COMMISSIONING AND SERVICE RECORD ............53

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1. INTRODUCTION
The D Series electric water heater is a high quality unvented enam-
elled steel domestic hot water cylinder suitable for domestic hot
water systems where the cold mains water supply has a maximum
supply pressure of 0.9 MPa. Reduced performance is available at
lower pressures but the units are not suitable for pressures lower
than 0.15 MPa and flow rate of 20 litres per minute.
Rointe offers the possibility to acquire all the necessary safety
equipment to comply with legislation governing the installation of
such systems.
2. TECHNICAL ESPECIFICATIONS
TECHNICAL SPECIFICATIONS - 50L, 75L & 100L
MODEL NOMBER DWI050DHW2 DWI075DHW2 DWI100DHW2
Storage capacity (l) 50 75 100
Power (W) 2,400 2,400 2,400
Depth (mm) 404 404 404
Width (mm) 404 404 404
Overall height incl T/P valve 780 1,000 1,250
Height excl T/P valve 680 900 1,150
Weight when full (kg) 68 100 132
Cold feed/hot draw off
connections (mm) 15 15 15
Maximum water supply
pressure (MPa) 0.9 0.9 0.9

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D Series with DELTA Ultimate technology
TECHNICAL SPECIFICATIONS - 50L, 75L & 100L
MODEL NUMBER DWI050DHW2 DWI075DHW2 DWI100DHW2
System operating
pressure (pre-set)
(MPa)
0.6 0.6 0.6
Expansion vessel
charge pressure
(MPa)
0.15 0.15 0.3
Expansion relief valve
set pressure (MPa) 0.6 0.6 0.6
Temperature and pressure relief valve settings:
Lift pressure (MPa) 0.7 0.7 0.7
Lift temperature (ºC) 90 90 90
INSTALLATION KIT (OPTIONAL) - 50L, 75L & 100L
0.3 MPa pressure
reducing valve • • •
0.6 MPa expansion
relief valve • • •
Expansion vessel ltr 8 8 12
15mm to 22mm
Tundish • • •
Isolation valve • • •
PERFORMANCE - 50L, 75L & 100L
Heat up time 15 to 65
ºC (min) 73 110 117
Reheat time for 70%
of contents (min) 51 77 82

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TECHNICAL SPECIFICATIONS - 150L & 200L
MODEL NUMBER DWI150DHW2 DWI200DHW2
Storage capacity (l) 150 200
Power (W) 2,400 2,400
Depth (mm) 580 580
Width (mm) 580 580
Overall height incl T/P valve 1,060 1,220
Height excl T/P valve 960 1,120
Weight when full (kg) 194 256
Cold feed/hot draw off connections
(mm) 22 22
Maximum water supply pressure
(MPa) 0.9 0.9
System operating pressure (pre-set)
(MPa) 0.6 0.6
Expansion vessel charge pressure
(MPa) 0.3 0.3
Expansion relief valve set pressure
(MPa) 0.6 0.6
Temperature and pressure relief valve settings:
Lift pressure (MPa) 0.7 0.7
Lift temperature (ºC) 90 90
INSTALLATION KIT (OPTIONAL) - 150L & 200L
0.3 MPa pressure reducing valve • •

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D Series with DELTA Ultimate technology
INSTALLATION KIT (OPTIONAL) - 150L & 200L
MODEL NUMBER DWI150DHW2 DWI200DHW2
0.6 MPa expansion relief
valve • •
Expansion vessel ltr 12 18
15mm to 22mm Tundish • •
Isolation valve • •
PERFORMANCE - 150L & 200L
Heat up time 15 to 65 ºC
(min) 175 235
Reheat time for 70% of
contents (min) 123 165
2.1. Component Check List
The D Series water heater comes with the following components.
Please check through the components supplied and ensure that
all parts are present:
• Water Heater with sheathed heating elements, digital
thermostat, TFT screen and manual reset thermal cut-out
• T/P valve 0.7 MPa 90ºC and electrolytic fittings
• Installation and user manual
Please contact our customer service department to find out how
to acquire the safety fittings.

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3. GENERAL REQUIREMENTS
3.1. The D Series domestic hot water cylinder MUST be installed
by a competent person in accordance with section G3 of the
current Building Regulations.
3.2. Important
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 installation instructions could invalidate the warranty.
3.3. Water supply
The water supply to the cylinder should be potable water direct from
a public mains water supply with any water treatment equipment
functioning correctly.
For optimum performance the unit should be fed via a 15 mm or
22 mm diameter supply pipe direct from the mains water entry
point to the property with supplies a maximum pressure of 0.9
MPa. The unit can operate with a minimum supply pressure of 0.15
MPa and a flow rate of at least 20 litres per minute, but flow from
the outlets will be low if several outlets are used simultaneously.
The cylinder control equipment is factory set to limit the system
operating pressure to 0.3 MPa. The maximum supply pressure
into the pressure-reducing valve is 0.9 MPa.
3.4. Taps and fittings
All taps and fittings incorporated in the unvented system should
have a rated operating pressure of 0.7 MPa or above.

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D Series with DELTA Ultimate technology
3.5. Location
The unit is designed to be vertically wall mounted, indoors, in
a frost-free environment. When choosing a suitable location for
the cylinder, consideration should be given to the routing of the
discharge pipe to a convenient point and also the availability of
an adequate power supply for connecting the sheathed heating
elements.
The wall onto which the cylinder is mounted should be of good
sound masonry construction capable of holding the weight of the
cylinder when full of water (see technical specifications for weights).
The position of the cylinder should be such that easy access is
provided for servicing the controls and replacing the sheathed
heating element should the need arise.
Pipe runs should be made as short as possible and lagged to
prevent heat loss.
To allow for servicing and repairs the unit must be mounted at
least 540 mm above any surface or object, so that access can be
gained to electric connectors and the heating elements may be
removed (see Fig. 1).
The unit should be mounted close to an external wall so that the
discharge pipe D2 (Fig. 2 - Pt. 6) can be routed to a safe visible
place.
The tundish should be mounted in a visible location so that it may
easily be inspected.

10
150 mm
100 mm 100 mm
540 mm
H C
Figure 1 - Minimum margins for servicing and repairs.
The distance between holes for the wall mounting depends on the
model, see the following table for reference:
Model DWI050DHW2 DWI075DHW2 DWI100DHW2
Horizontal width between
holes 350 mm 350 mm 350 mm
Height between upper
and lower holes 340 mm 573 mm 768 mm
Model DWI150DHW2 DWI200DHW2
Horizontal width between holes 350 mm 350 mm
Height between upper and lower holes 595 mm 685 mm

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D Series with DELTA Ultimate technology
3.6. Storage and handling
If the cylinder is not being installed immediately, it should remain in
its box with all pipe end protective caps in situ to prevent damage.
We recommend that the cylinder be transported to its installation
position with the outer box in place.
3.7. Pipework connections
All pipework connections to the cylinder MUST be made in
accordance with Figure 2.
3.8. Safety
This water heater can be used by children aged from 8 years and
above and persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge if they are
supervised or have been given instruction concerning use of the
appliance in a safe way and understand the hazards involved.
Cleaning and user maintenance shall not be made by children
without supervision. Children must be supervised at all times to
ensure that they do not play with the product.
4. PLUMBING INSTALLATION
4.1. Connections
Connections MUST be made to the cylinder in accordance with
Figure 1 and Figure 2. A drain cock (not supplied) (Fig. 2 - Pt.
7) should be fitted in the position shown in Figure 2 to facilitate
draining of the cylinder.

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4.2. Electrolytic fittings
The electrolytic fittings (Fig. 2 - Pt. 11) must be fitted to the water
heater. If not, the guarantee will be void. Check the T/P Relief
Valve (Fig. 2 - Pt. 10) to ensure it is connected with the electrolytic
fittings. If not, please contact us.
4.3. Cold water supply
For best results, the cylinder should be fed by an uninterrupted
supply pipe into the pressure reducing valve (PRV) (Fig. 2 - Pt. 3)
with a maximum supply pressure of 0.9 MPa. The cylinder should
not be used on any system with a supply pressure below 0.15 MPa
and a flow rate of less than 20 litres per minute.
4.4. Temperature and pressure relief valve
The temperature and pressure relief valve (T/P Valve) is supplied
(Fig. 2 - Pt. 10). Once the T/P valve is fitted should not be removed
from the cylinder or tampered with in any way. The valve is pre
calibrated to lift at 0.7 MPa or 90 degrees centigrade and any
attempt to adjust it will invalidate the warranty and could affect the
safety performance of the unit.
The outlet of the T/P valve should be routed in 15 mm copper
piping in a downward direction alongside the water heating unit to
the tundish in a frost-free environment. The outlet of the expansion
relief valve must be T’d into this pipe before the tundish so that
any water exiting either valve can be seen draining through the
tundish– see figure 2 and 3.

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D Series with DELTA Ultimate technology
Water Flow
To tap
CW
to tap
Cold
water
inlet
Hot
water
Outlet
12
5
3
4
300 mm
MIN
100 mm
MAX
6
9
87
10
11
11
Figure 2
D Series Cylinder Connection
Arrangement

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Figure 2 - D Series Cylinder Connection Arrangement
1 Mains cold water supply
2 Stop cock (not supplied)
3 Pressure reducing valve *
4 Check valve *
5 Expansion relief valve *
6 Discharge pipe 22 mm
7 Drain cock (not supplied)
8 Tundish *
9 Expansion vessel *
10 T/P relief valve (included)
11 Electrolytic fittings (included)
* Available in optional Installation Kit
4.5. Pressure reducing valve
The pressure reducing valve (Fig. 2 - Pt. 3) should be installed
in the cold water supply to the water heating unit with the arrow
pointing in the direction of water flow as shown in figure 2. This can
be connected to a maximum supply pressure of 0.9 MPa.
4.6. Expansion relief valve
(Fig. 2 - Pt. 5) This must be installed between the pressure reducing
valve and the water heating unit in accordance with Figure 2. No
other valve should be fitted between this valve and the cylinder.
The expansion relief valve contains a non return valve.

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D Series with DELTA Ultimate technology
4.7. Expansion vessel
A suitable expansion vessel (Fig. 2 - Pt. 9) with a pre-charge
pressure of 0.15 or 0.3 MPa is available in an optional kit for fitting
to all water heating units in the range. The expansion vessel MUST
be fitted to the safety group. The expansion vessel MUST be
positioned with the entry point at the bottom – see Figure 2.
IMPORTANT: Regular checks must be carried out to ensure that
the expansion vessel is correctly pressurised to 0.15 or 0.3 MPa at
all times. – see Figure 2.
4.8. Tundish
The tundish (Fig. 2 - Pt. 8) must not be positioned above or in
close proximity of any electrical current carrying devices or wiring.
The installation should conform with the requirements of item 4.9
below.
4.9. Discharge arrangement
The tundish (Fig. 2 - Pt. 8) must be installed in a position so that
it is clearly visible by the user. In addition, the discharge pipe (Fig.
2 - Pt. 6) from the tundish should terminate in a safe place where
there is no risk to persons in the vicinity of the discharge, be of
metal, and:
(a) Be at least one pipe size larger than the normal outlet size of
the safety device unless its total equipment 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 then the normal outlet size of the safety
device, between 18m and 27m at least three sizes larger and

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so on. Bends must be taken into account in calculating the flow
resistance. Refer to the diagram, tables and worked example
detailed below.
TUNDISH
600mm
MAX
300mm MIN
Metal discharge pipe from
temperature relief valve to tundish
Safety device (Eg: Temp relief valve)
Discharge below
xed grating
Fixed Grating
Trapped Gullley
Discharge pipe (D2) from
tundish, with continuous fall.
Figure 3 - Typical discharge pipe arrangement.
(b) Have a vertical section of pipe at least 300 mm long below the
tundish before any elbows or bends in the pipework.
(c) Be installed with a continuous fall.

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D Series with DELTA Ultimate technology
(d) Have discharges visible at both tundish and the final point of
discharge, but where this is not possible or practically difficult,
examples of acceptable discharge arrangements are:
• Ideally below a fixed grating and above the water seal in a
trapped gully.
• External surfaces such as car parks, hard standings,
grassed areas, etc.) are acceptable providing that where
children play or 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 apparent (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.

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WARNING! The discharge will consist of scalding water and
steam. Asphalt, roofing felt and non-metallic rainwater goods may
be damaged by such discharges.
SIZING OF COPPER DISCHARGE PIPE “D2” FOR COMMON
TEMPERATURE RELIEF VALVE OUTLET SIZES
Valve outlet
size
(diameter,
inches)
Min size of
discharge
pipe D1
(mm)
Min size of
discharge
pipe D2
from
tundish
(mm)
Max
resistance
allowed,
expressed
as a length
of straight
pipe, i.e. no
elbows or
bends
Resistance
created by
each elbow
or bend (m)
15
22
28
35
up to 9
up to 18
up to 27
0.8
1.0
1.4
22
28
35
42
up to 9
up to 18
up to 27
1.0
1.4
1.7
28
35
42
54
up to 9
up to 18
up to 27
1.4
1.7
2.3
Worked example
The example below is for a ”diameter temperature relief valve

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D Series with DELTA Ultimate technology
with a discharge pipe (D2) having 4 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 ”diameter temperature relief
valve is: 9.0m.
Subtract the resistance for 4 No 22mm elbows at 0.8m each =
3.2m.
Therefore, the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m, therefore, calculate the
next largest size.
Maximum resistance allowed for a straight length of 28mm pipe
(D2) from a ”diameter temperature relief valve equates to: 18m.
Subtract the resistance for 4 No 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.
5. ELECTRICAL INSTALLATION
WARNING! THIS EQUIPMENT MUST BE EARTHED.
All electrical wiring must be carried out by a competent person
and in accordance with the current I.E.E. Wiring Regulations. All
pipework should be earthed!
5.1. The sheathed heating elements
Two parallel 1.2kW 230v 50Hz sheathed heating elements are pre
fitted to the cylinder at the factory. They are wired in accordance
with the instructions given in Figure 4.

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5.2. Wiring diagram
a) The power supply to the heater must be via a double pole isolator
switch or controller, having contact separation of at least 3 mm,
to comply with BS 6141 and must be fully earthed. In case of an
electric problem, check that the wiring follows the diagram below:
i. The Earth wire is connected to the terminal on the cylinder
marked with the earth symbol.
ii. The Live wire is connected to the high temperature cut-out
terminal.
iii. The Neutral wire is connected to the high temperature cut-out
terminal.
WARNING! DO NOT SWITCH ON THE ELECTRICITY
SUPPLY UNTIL INSTRUCTED TO DO SO IN THE COMMISSIONING
PROCEDURE AND ONCE THE UNIT IS FULL OF WATER.
Wiring diagram - D Series water heater.
COLD HOT
EARTH
CONNECTION
HEATING ELEMENTS
THERMAL
CUT OUT