Metro Therm 15 pipe downwards 905 User manual

Manual
Models 15, 30 and 35
Type 611, 905, 906, 907, 909 and 910
ELECTRICAL
WATER HEATERS
08:008-1902
TANKS

2
Model 15 pipe downwards
Type 905
METRO number: 119051004
Plumbing number: 345166200
Model 15 pipe upwards
Type 906
METRO number: 119061004
Plumbing number: 345167200
Model 30 pipe downwards
Type 907
METRO number: 119071004
Plumbing number: 345166400
Model 30 pipe upwards
Type 910
METRO number: 119101004
Plumbing number: 345167400
Model 35 pipe upwards
Type 909
METRO number: 119091001
Plumbing number: 345161034
Model 35 pipe downwards
Type 611
METRO number: 116111004
Plumbing number: 345121100
Type 905, 907
Type 906, 910
Type 611
Type 909

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Contents
Transport 4
Position 4
Diagram 5
Plumbing installation 6
Electrical installation 8
User Guide 10
Maintenance 12
Troubleshooting 14
Guarantee terms 16
Declaration of compliance 18

4
Transport
Inspect the water heater for damage and missing parts immediately upon receipt. Report any
damage or missing parts to the carrier immediately. All carriage is the responsibility of the
recipient unless otherwise agreed.
Position
Installation can only be performed by an authorised plumbing installer, and in accordance
with the Danish Building Code.
Tank and pipes cannot be exposed to freezing. Position the tank close to its water supply and
a floor drain. Ensure that there is sufficient room for service and maintenance.
Important!
Check that the wall can bear the weight of the tank when full of water.
Type 906, 909 and 910 (pipe upwards) must stand on a firm, level surface.

5
Type no. Pipe
connection
Model Volume
(litres)
Net
weight
a a1 b c e f h i
905 i15 14 16 450 35 300 390 70 110 103 255
906 h15 14 16 450 35 300 390 70 110 103 255
907 i30 26 22 525 65 345 460 70 138 103 255
909 h35 33 25 380 25 540 380 100 105 - -
910 h30 26 22 525 65 345 460 70 138 103 255
611 i35 33 23 700 30 300 300 70 50 183 160
Dimensioned diagram
All dimensions are in mm.
B Hot water outlet
C Cold water inlet
H Holes in mounting plate
J Drain spout
N Control box
O Indicator light
Q Electrical connection
W Removable plate
I CC measurements for mounting plate
Models 15-30 (type 905, 907) Models 15-30 (type 906, 910)
Model 35 (type 611) Model 35 (type 909)
Diagram

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Plumbing installation
Note following for installation
Installation can only be performed by an authorised plumbing/electrical installer, and in
accordance with the Danish Building Code.
• Installations shall comply with the Danish Building Code and all other relevant regulations
and provisions, including those for electrical and water installations.
• Check all technical data and information on the type plate.
• Check that all accessories are removed from the packaging.
• Check that there is easy access to the hot water tank.
• Flush all water pipes carefully before connection.
• Always perform pressure testing at water pressure of 10 bar when replacing a water heater
or service has been performed on pressurised parts.
• Never expose the heater to water pressure exceeding 1 MPa (10 bar).
• The heater is fitted with nylon bushings for the cold water connection and PEX pipes for the
hot water connection. These parts protect the enamel coating and must not be removed.
The installer shall instruct the user of the heater’s function, care and disposal.
Approvals
VA no. 3.23/DK 19559
Approved by DEMKO
Hot water tank
Test pressure 13.5 bar
Operating pressure 10 bar
Energy labels at www.METROTHERM.dk
Risk of corrosion
METRO THERM hot water tanks are made of enamelled steel, and protected by a magnesium
anode. If connections and pipes are copper or stainless steel, there can be risk of galvanic
corrosion at the point of connection.
The risk can be mitigated by using a PEX pipe adapter between tank and pipe installation.
Using softened water in a METRO THERM tank
Water softened using salt can be used in a METRO THERM hot water tank. Conductivity must
be kept under 100 mS/m (millisimiens per m), to be able to use the anode. Water pH value
must be between 6 and 9, and chloride content must be under 250mg Cl/l.
If this level of conductivity is exceeded, the anode current will be too high, degrading the
anode too rapidly. That will cause the water to smell. It may be necessary to remove the anode
to remedy this, which will invalidate the METRO THERM 5-year corrosion guarantee on the
inner tank.
Do not use demineralised water (double ion exchange), which will rapidly corrode the tank.
Demineralised water is also referred to as totally desalinated or deionised water.

7
1. Water supply (cold) 3/4” shut-off valve
2. Non-return valve (integrated)
3. Safety valve
4. Overflow 3/4”
5. Drain tap
B Hot water out 3/4”
C Cold water in 3/4”
Installation as pressurised tank
The water heater can be installed as a pressurised tank with shut-off, non-return and safety
valves. The safety valve used must comply with the Danish Working Environment Authority's
specifications. Opening pressure must be 10 bar.
Safety device
The safety and non-return valves must be positioned as shown in figure 1.
• The safety valve must be mounted on the cold water supply pipe close to the tank, and easily
accessible for service and testing/activation to prevent limescale accumulation.
• It must be impossible to shut-off the pipe connecting safety valve and tank and the overflow
from the safety valve. The diameter must be min. 3 /4” (20 mm).
• The overflow outlet must be visible, and run to a drain. Do not run the overflow out into the
open air to prevent the risk of freezing.
• The safety valve must be able release the rated output of the water heater at least. The use of
a METRO THERM safety device (figure 2) fulfils this requirement.
Because water expands when heated (approx. 2%), the safety valve must drip during heating.
When filling (or emptying) the tank, allow air to vent, e.g. by opening a hot water tap.
Non-pressurised installation
When installed non-pressurised, the heater can only supply one tap.
Mixer taps B2 and B3 are used for water heaters with pipe upwards (type 906, 909 and 910)
(figure 3). When installing, the pipes from the mixer tap cannot project more than 30 mm
down into the tank pipe connections. Failure to observe the above can form air pockets that
can cause breakdown. The overflow mixer tap must be mounted directly connected to the
water heater with 3/4” connectors (ordered separately).
Mixer tap B71 is used for water heaters with pipe downwards (type 905, 907 and 611)
(figure 4).
The diameter of the overflow pipe (drain spout) cannot be reduced by aerators, water-savers
or the like. Long pipe installations can mean long run-on.
Figure 2
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7
7
Figure 3 – with pipe upwards
1. Water supply
2. Drain spout (overflow)
3. Handle for hot water
4. Handle for cold water
5. Tank inlet
6. Tank outlet
7. Non-return valve Figure 4 – with pipe downwards
Figure 1
CB
4
5
321
C
5
3
1
4

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Electrical installation
Electrical installation can only be performed by an authorised
electricalinstaller.
The water heater has splashproof IP24 encapsulation and must always be extra-
protected in accordance with the LVD directive.
The standard heating element can be connected to 400 V (3.6 kW) or 230 V (1.2 kW)
(type 909 230V (1.5 kW) only), see wiring diagram.
The water heater is supplied from the factory with a 3-wire cable (with no plug) to be
connected to mains electricity. If the cable is damaged, it must be replaced (can be
purchased as a spare part).
The water heater is fitted with a thermal fuse to prevent overheating, and that can be
reconnected. The fuse can only be reconnected by an authorised electrician. The fuse is
located behind a black screw in the control box (figure 5). The thermostat has a working
range of 5-65°C and an on/off function to replace the switch at the mains.
The thermostat and thermal fuse are combined, and mounted in the grey control box on
the water heater, along with the indicator light.
Remember that the copper sensor tube from the thermostat and thermal fuse must
extend as far from the spade terminal on the heating element as possible.
Remember!
The water heater must be
filled with water before
connecting electricity.
Screw with access
to thermal fuse
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Off 5°C
Max.
Heating on
Figure 5

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1. Connection to mains electricity
2. Cable penetration with strain relief
3. On/off switch, thermal fuse (110°C)
and thermostat (65°C)
4. Indicator light – comes on when the
thermostat opens up for heat
5. Tubular heating element, type 909
steatite heating element
8. Terminal, earth wire (tank)
9. Terminal, earth wire (cabinet)
10. Terminal block on baseplate
* When connected to 230V~ blue wire
must be connected to neutral (230V on
type 909 only).
Y/GR = yellow/green
BR = brown
BL = blue
B = black
Wiring diagram 3.6 kW – 400V/1.2 kW – 230 V/1.5 kW – 230 V (type 909)
Type 611, 905, 906, 907, 909 and 910
BR (SILICONE)
B (SILICONE)
INTERNAL
EXTERNAL
FOR 230V see*
Y/GR
Y/GR Y/GR Y/GR

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User Guide
Read this manual carefully before installation and using the water heater.
Safety regulations
Installation, first activation and maintenance of this product can only be performed by an autho-
rised plumber/electrician, who will be responsible for observance of the relevant standards and
installation regulations. We cannot be held liable for damage or injury caused by failing to
observe the safety regulations.
Risk of flooding and freezing
If the water heater is mounted in a holiday home, or a house which is uninhabited for long peri-
ods, we recommend draining the entire water installation to damage caused by freezing. If there
is no risk of freezing, shutting-off the water supply at the mains cock will be sufficient.
Setting temperature
The water heater is fitted with a grey control box. Set the desired water temperature using the
thermostat dial. The thermostat will then control heating of the water to the desired tempera-
ture. See figure 7 for thermostat scale markings. The indicator light (Heating on, figure 6) comes
on when electricity is connected and the heating element is activated.
NB:
Pipes and fittings near the water heater can reach temperatures over 60˚C.
The water heater is fitted with a thermal fuse that will cut-out in the event of overheating.
The fuse can only be reconnected by an authorised electrician.
Figure 6
Heating times 10-50°C (minutes)
Type 1.2kW 3.6kW 1.5 kW
611 81 27
905 35 11
906 35 11
907 70 23
909 65
910 70 23
Setting the thermostat
Relationship between thermostat scale and desired tank temperature.
Set as a time on a clock face. All values are indicative.
Setting Min. 13.00 15.00 18.00 19.00 20.00 max.
5 10 25 35 45 55 65°C
Figure 7
Screw with access
to thermal fuse
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Off 5°C
Max.
Heating on