Thermann 25THMS124P User guide

INSTALLER’S
MANUAL
25L and 50L
Electric Storage Water Heaters
Models
25THMS124P | 25THMS136
50THMS124P | 50THMS136

Thermann Installer’s Manual
25L & 50L Electric Storage Water Heaters
Specifications and materials may change without notice.
Eective for all Thermann 25L & 50L Electric Storage Water Heaters
manufactured and sold after 1st July 2016.

1
CONTENTS
Installation Requirements 2
Technical Data 3
Plumbing Connections 4
Filling and Draining 6
Electrical Connection 7
Handover to the Customer 8

2
Thermann Installer’s Manual
25L & 50L Electric Storage Water Heaters
INSTALLATION REQUIREMENTS
General:
This water heater must be installed
by a licensed tradesperson, and in
accordance with:
• AS/NZS 3500.4 Plumbing and
Drainage – Heated Water Services.
• Clause G12 of the NZ Building Code
(in New Zealand).
• AS/NZS 3000 Electrical Installations
(known as the Australian / New
Zealand Wiring Rules).
• Local authority regulations.
• Outside Australia and New Zealand,
please refer to local plumbing and
building codes and regulations.
Failure to comply with these
requirements may aect the warranty.
Note for Victoria:
This water heater must be installed by
a licensed person as required by the
Victorian Building Act (1993).
Only a licensed person will provide a
compliance certificate, showing that
the work complies with all the relevant
Standards. Only a licensed person
will have insurance protecting their
workmanship.
Pool Heating:
This water heater must not be used for
pool heating.
Location:
The water heater should be located as
close as possible to the most frequently
used hot water outlet.
Ensure the compliance plate and
associated warnings are clearly visible.
The water heater must be accessible
without the use of a ladder or scaold.
Adequate clearance must be available
for service to the element, thermostat,
relief valve and anode. All models
are equipped with a sacrificial anode,
accessed through the top cover.
Electric storage water heaters may be
installed indoors. A properly drained
safe tray must be installed where
property damage could occur from
water spillage. Refer to AS/NZS 3500.4
for further information.
Note - the warranty will not cover
damage due to leakage of the water
heater if a properly drained safe tray
has not been installed.
Refer to local regulations before
installing the water heater in a roof
space.
Water Heater Support:
The water heater must be installed on
a flat, solid supporting surface. The
pipework must not be used to support
the water heater.
Where the water heater is subjected
to wet conditions, a plinth should be
installed under the water heater.

3
TECHNICAL DATA
Specifications 25L 50L
Storage Capacity (L) 31 50
Hot Water Delivery (L) 25 50
Net Weight Empty (kg) 17 23
Element Sizes (kW) 2.4, 3.6 2.4, 3.6
Relief Valve:
Pressure (kPa) 1000
Temperature (°C) 99
Power Rating (kW) 10
Nominal Dimensions 25L 50L
Total Height (A) 455 670
Total Width (B) 405 405
Outlet Height (C) 275 490
Inlet Height (D) 145 145
Electrical Entry (E) 70 70

4
Thermann Installer’s Manual
25L & 50L Electric Storage Water Heaters
PLUMBING CONNECTIONS
Relief Valve:
The Pressure & Temperature Relief (PTR)
Valve, along with a brass reducer, is
supplied loose with the water heater.
The PTR Valve rating is 1,000 kPa.
The PTR Valve rating is also shown on
the compliance plate. The PTR Valve
must be installed with the brass reducer
directly into either of the RP¾”(DN20)
sockets marked “RELIEF VALVE”. Ensure
that a sealing material is applied to the
PTR Valve and the brass reducer to
prevent water leaks.
The unused socket marked “RELIEF
VALVE” is to be plugged with one of the
brass plugs supplied loose with the water
heater. Ensure that a sealing material
is applied to the brass plug to prevent
water leaks.
The drain line from the PTR Valve
must be made of copper and run in
accordance with the requirements of
AS/NZS 3500.4. It must be installed in
a continuously downward direction in a
frost free environment.
The PTR Valve and its drain line must
not be sealed or blocked. Generally a
separate drain line must be run for the
valve although it may be joined with the
drain line from the expansion control
valve under certain circumstances.
Care must be taken when attaching
pipe saddles to the water heater.
Self-drilling screws no longer than 12 are
recommended.
It is normal for the valve to leak a small
amount of water during heating cycles.
The PTR Valve is not intended to enable
connection of the water heater to
supplementary energy sources such as
solar panels or slow combustion stoves.
Refer to AS/NZS 3500.4 for guidance on
these types of installations.
Hot Water Connection:
The hot water pipe is to be connected to
either of the RP¾”(DN20) sockets with
red surrounds at the top of the water
heater.
The unused socket with red surrounds
is to be plugged with one of the brass
plugs supplied loose with the water
heater. Ensure that a sealing material
is applied to the brass plug to prevent
water leaks.
It is recommended that all hot water
pipes are insulated. Hot water pipes
installed outdoors should be insulated
with UV stabilised insulation.
Plastic pipes or fittings shall not be used
within 1 metre of the outlet although
they may be used downstream of a
temperature control valve. Refer to
AS/NZS 3500.4 for further details.
Temperature Protection:
Water heaters can produce very hot
water. To reduce the risk of scald injury,
it is mandatory under the requirements
of AS/NZS 3500.4 that an approved
temperature control device is fitted to
the hot water supply to outlets used
primarily for personal hygiene. This
device should be checked at regular
intervals to ensure its operation and
settings remain correct.

5
PLUMBING CONNECTIONS
Water Supply:
This water heater has been manufactured
to suit the water conditions of most
Australian metropolitan supplies.
Please note certain water supplies can
have a detrimental eect on the water
heater and its life expectancy. If you are
unsure about the water supply you can
obtain information from the local water
supply authority.
The water heater is designed for use in
areas where the Total Dissolved Solids
(TDS) content of the water supply is
less than 2500 mg/L. The Tank Failure
Warranty (see Owner’s Guide) does not
apply in areas where the TDS exceeds
2500 mg/L.
In areas where the TDS exceeds
600mg/L, it is possible the magnesium
alloy anode (supplied in standard water
heaters) may become over-reactive. To
alleviate this, the magnesium alloy anode
should be replaced with an aluminium
alloy anode. Aluminium alloy anodes are
available from your local Reece branch.
Water can also be very corrosive, the
measure of this is the saturation index. If
the water saturation index is greater than
0.40, an expansion control valve should
be fitted. If the index is greater than 0.80,
the electrical heating element should
be replaced with a low power density
Incoloy heating element. Please consult
Customer Service on 1300 412 612 for
advice if required.
Cold Water Connection:
The water heater is intended to be
permanently connected to the water
supply main, and not connected by a
hose-set.
An approved isolating valve, non-return
valve, line strainer (optional but
recommended) and union must be fitted
between the water supply main and
either of the RP¾”(DN20) sockets with
blue surrounds at the bottom of the
water heater. See the diagram on page 6
for details.
All fittings must be approved by the
relevant Authority. Plastic pipes or
fittings shall not be used between the
isolating valve and the inlet.
The unused socket with blue surrounds
is to be plugged with one of the brass
plugs supplied loose with the water
heater. Ensure that a sealing material
is applied to the brass plug to prevent
water leaks.
Water Supply Pressure:
This water heater is designed for direct
connection to water supply pressures of
up to 800 kPa .
Where the mains pressure can exceed
or fluctuate beyond this pressure, a
pressure reducing valve must be fitted in
the cold water inlet supply.
Note for New Zealand, South Australia
and Western Australia:
It is a requirement in these locations that
an expansion control valve be fitted on
the cold water supply line between the
non-return valve and the water heater.

6
Thermann Installer’s Manual
25L & 50L Electric Storage Water Heaters
FILLING AND DRAINING
Filling the Water Heater:
The water heater must be filled with
water before turning on the electrical
supply.
1. Open all hot water taps.
2. Open the isolating valve at the cold
water inlet slowly and allow the
water heater to fill until water flows
through the system.
3. Close each hot water tap after the
air is expelled from its line.
4. Open the Pressure & Temperature
Relief Valve for approximately 10
seconds by lifting the easing lever
on the valve. Confirm water is
relieved to waste through the relief
valve drain pipe.
5. Lower the lever gently and check it
closes correctly.
Draining the Water Heater:
1. Turn o the electricity supply to the
water heater.
2. Turn o the cold water supply to the
water heater at the isolating valve.
3. Gently operate the easing lever on
the Pressure & Temperature Relief
(PTR) Valve to release the pressure
in the water heater.
4. Disconnect the cold water inlet
union and attach a drain hose to the
water heater.
5. Gently operate the easing lever
on the PTR Valve to let air into the
water heater and allow water to
escape through the hose.
Note: a combined isolating valve/non-return valve/line strainer may be used.
The expansion control valve is only required where local regulations demand,
although it is recommended in areas where the water saturation index is greater
than 0.40.
Cold Water Connection Diagram:

7
ELECTRICAL CONNECTION
General:
This water heater is designed for
single phase 240V a.c. supply only. The
electrical connection must comply with
Local Supply Authority Regulations and
AS/NZS 3000.
Pre-Wired Models:
Water heaters with the letter “P” at the
end of their model number are factory
fitted with a power supply cord. These
water heaters may be plugged into a
standard general purpose power outlet.
If the power supply cord is damaged, it
must be replaced by the manufacturer,
a service agent or a similarly qualified
person in order to avoid a hazard.
“Hard Wired” Models:
Water heaters without the letter “P” at
the end of their model number are not
factory fitted with a power cord.
Connection of the electrical wiring
must only be carried out by a licensed
tradesperson. Before removing the
electrical cover, ensure the electrical
power supply is safely isolated.
Connections are made at the terminal
block under the water heater electrical
cover, and a means for disconnection
must be incorporated in the fixed
wiring in accordance with the Wiring
Rules.
The electrical cover may be removed
by undoing the two screws at the
bottom of the cover and sliding the
cover downwards to disengage the top
edge.
Cable entry to the connection area is
through the hole in the case beneath
the electrical cover, designed to accept
a 20mm conduit. Ensure the conduit
entry is well sealed to achieve the
correct weatherproofing.
When the supply wiring has been
connected, ensure the wires are kept
lower than the terminal block.
Before replacing the electrical
cover, press the reset button on
the thermostat to ensure the over-
temperature energy cut-out is set.
Ensure the water heater is filled with
water before turning on the electricity
supply.

8
Thermann Installer’s Manual
25L & 50L Electric Storage Water Heaters
HANDOVER TO THE CUSTOMER
Owner’s Guide:
Ensure the customer receives the
Owner’s Guide supplied with the water
heater.
Victorian Installations:
Ensure you provide the customer with
a Compliance Certificate as required
by the Victorian Building Act (1993).
Also ensure you lodge the Compliance
Certificate with the VBA within five
days of completing the installation.
Disposal of Packaging:
Dispose of the packaging and other
transit protection responsibly using
recycling facilities where they exist.

028661 Rev.A