Thermann 26NG50C User guide

INSTALLER'S
MANUAL
Gas Continuous Flow Condensing Water Heaters
Models
26NG50C/26LP50C
26NG60C/26LP60C
Installation Details
Warranty

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters

33
Important Safety Instructions 4
Electrical Connection 5
Introduction 6
Exploded Diagram of Unit 7
Dimensions 8
Technical Data 9
Cold Water Connection 10
Hot Water Connection 10
Gas Connection 11
Electrical Connection 11
Condensate Drain 12-14
Checking Operation 14
Remote Controllers 14-20
Cascade Installation 21-22
Cascade Set Up 22
Cascade Installation Flowchart 23
Wiring Diagram and Remote Controllers
Installation Schematic 24
Fault Monitor 25-26
CONTENTS

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
4
IMPORTANT SAFETY INSTRUCTIONS
DO NOT INSTALL INDOORS
These units are designed for outdoor installation and
should never be installed indoors as this can cause
oxygen deficiency and incomplete combustion.
WATCH FOR GAS LEAK
When gas leak is noticed, stop using the unit
immediately and close the gas valve.
CONFIRM TYPE OF GAS AND POWER SUPPLY
Make sure to use the gas type as well as power supply
(voltage/frequency) as indicated on the label located
on the cabinet side.
Natural Gas or Propane will be printed on the
gas type label.
FREEZE PREVENTION
This unit comes equipped with anti-frost heaters that prevent the water heater from freezing.
To enable this freeze prevention system to operate there must be an electrical power supply
connected to the unit.
The freeze prevention devices will not operate if the electrical power source is not connected.
The anti-frost heaters are installed inside the water heater only. All external hot and cold water
supply pipes, drain pipe and fittings connected to the water heater should be properly insulated
to prevent freezing. Freezing of the drain pipe can cause clogging and cause the unit to stop
operating.
SECURE SERVICE SPACE
Make sure there is enough space around the
unit for checking, service and maintenance.
Close
5
Caution
Pull
No wet hand
CloseClose
Danger
Warning
No Fire Prohibited
Check

555
ELECTRICAL CONNECTION
DO NOT REPLACE POWER CORD, REMOTE CONTROLLER CABLE OR CASCADE CABLE
If the cord or cable is damaged, it should be replaced by a cord or cable available
from your local Reece branch. The cord or cable must be replaced by an authorised
tradesperson.
DO NOT USE POWER CORD BUNDLED
Never use power cord in a bundled condition.
It can cause heat generation and fire.
DO NOT PULL POWER CORD
Do not remove the power plug by pulling the cord as
it may generate heat by wire breakage and cause fire.
Hold the plug when removing the power cord.
INSERT POWER PLUG FULLY INTO POWERPOINT
Check that the power plug is clean and undamaged,
then fully insert into the power point.
DANGER OF WET HANDS
Do not touch power plug with wet hands. It can cause
electric shock.
5
5
5
5
Prohibited
Prohibited
Warning
Check
WARNING:
For continued safety of this appliance it must be installed, operated and maintained in
accordance with the manufacturer's instructions.

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
6
GENERAL
The Thermann Continuous Flow must be installed in accordance with the following:
(1) These instructions;
(2) National Construction Code and Local authority regulations;
(3) AS/NZS 3500.4 “Plumbing and Drainage - Heated Water Services”,
(4) The Australian standard for gas installations AS/NZS 5601;
(5) Any other statutory regulation that may apply;
(6) A notice of intention to install shall be lodged with the relevant local Gas Authority
prior to installation.
DELIVERY INSPECTION
The Thermann Gas Continuous Flow hot water heater unit is supplied fully assembled and
ready for installation.
The installer, upon delivery of the unit, should immediately remove all packing materials
and inspect the unit for damage, and ensure that the unit supplied is correct for the
gas supply to which it is to be connected. If any concerns, please report any damage or
discrepancies to Reece, quoting the serial number and model number, which can be found
on the outside of the cabinet.
INSTALLATION MUST BE CARRIED OUT ONLY BY AN AUTHORISED AND
APPROPRIATELY LICENSED PERSON.
This product is an external electronic gas hot water heater.
These units are factory set to deliver 50°C or 60°C depending on the model purchased.
If the unit has a factory setting temperature higher than 50°C and is intended to deliver
water directly to sanitary fixtures used primarily for the purposes of personal hygiene,
it must be fitted with an approved tempering valve into the hot water piping to any
bathroom and/or ensuite.
Up to three optional remote controllers can be provided for complete hot water
temperature selection. If this option is used an approved temperature limiting device
must be installed on any units with a delivery temperature above 50°C.
INTRODUCTION
THIS HOT WATER UNIT IS NOT FOR POOL OR SPA HEATING

777
EXPLODED DIAGRAM OF UNIT
PARTS DESCRIPTION
1. FLUE OUTLET
2. GAS VALVE
3.CIRCUIT BOARD
4.BURNER CASE
5.HOT WATER OUTLET
6.COLD WATER INLET
7. GAS SUPPLY INLET
8.DRAIN OUTLET
9.PRIMARY HEAT
EXCHANGER
10. SECONDARY HEAT
EXCHANGER
11. WATER VOLUME
PROPORTIONAL VALVE
12. NEUTRALIZER
9
4
10 1
5
3
2
68
11
12
7

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
8
DIMENSIONS
6868
6868
637
573 25
366
599 12
15
20521
350
DRAIN OUTLET
WATER INLET FILTER
COLD WATER INLET
R3/4 /20
GAS SUPPLY INLET
R3/4 /20
POWER CABLE ENTRY
HOT WATER OUTLET
R3/4 /20
PRESSURE RELIEF VALVE
6868
6868
637
573 25
366
599 12
15
20521
350
DRAIN OUTLET
WATER INLET FILTER
COLD WATER INLET
R3/4 /20
GAS SUPPLY INLET
R3/4 /20
POWER CABLE ENTRY
HOT WATER OUTLET
R3/4 /20
PRESSURE RELIEF VALVE

999
TECHNICAL DATA
MODEL 26
Nominal hourly gas consumption by
proportional electronic gas control MJ/h 173
Test point pressure (NG) kPa 0.84
Test point pressure (Propane) kPa 1.27
Water heating capacity @ 40°C rise L/min 16.25
Minimum working pressure kPa 115
Maximum working pressure kPa 1200
Gas injectors diameter (NG) mm 1.00 / 1.50
Gas injectors diameter (Propane) mm 0.7 / 1.0
Input voltage single phase 50Hz V240
Maximum output current (incl. anti-frost heater) A0.44 (0.66)
Ingress protection rating IPX4
Inlet gas connection male thread R3/4” (20mm)
Cold water connection male thread R3/4” (20mm)
Hot water connection male thread R3/4” (20mm)
Condensate connection male thread R1/2" (15mm)
Relief valve pressure setting kPa 1400
Weight dry kg 20.5
Dimensions (DxWxH) mm 205 x 366 x 573
IAPMO Approval certificate no. GMK10408. Watermark Certificate of compliance WM-000506
DATA PLATE
Left outside of cabinet.
GAS TYPE
The gas label is located on the left outside of cabinet. The label will be either Natural Gas
or Propane. The nominated gas is the gas that this appliance is designed to operate with.
DO NOT OPERATE WITH ANY OTHER GAS TYPE.
WARNING LABELS
Located on the side of the cabinet. PLEASE READ THESE LABELS CAREFULLY.
INSTALLATION LOCATION
THIS HEATER IS APPROVED FOR OUTDOOR INSTALLATION ONLY.
IT IS NOT SUITABLE FOR INDOOR USE.
Refer to AS/NZS 5601 for clearance requirements of flue termination. In addition, ensure
that the appliance installation location permits easy access for maintenance and operation.
MOUNTING THE APPLIANCE
The heater must be installed by using a fixing method which is sucient to support the
weight of the unit. Refer to diagrams on page 8 for dimensions of mounting brackets and
positions. The top bracket has a centre hole so that the appliance can be positioned
by hanging it on one screw, then other screws can be secured.

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
10
COLD WATER SUPPLY TO WATER HEATER
Refer to the Dimensions diagrams on page 8 for the position of connections.
Copper tube of a minimum size of 3/4" (DN20) should be connected to the appliance.
The water inlet connection is R3/4" (20mm) male BSP and require a union to allow for
removal of the water heater.
Pipe sizing from the cold water supply should be sized according to local BY LAWS
for water supply.
This appliance is intended to be connected permanently to the water supply and not
connected by a temporary method such as a garden hose.
ISOLATING VALVE
A full flow isolation valve such as a gate valve or ball valve together with a disconnection
union must be used on the cold water inlet to the water heater.
THIS REQUIREMENT IS AN AUSTRALIA WIDE REQUIREMENT UNDER
THE NATIONAL PLUMBING CODE.
If the above instruction is not carried out, all warranties on the unit will be voided.
Stop taps or combination stop taps and non-return valves are not to be used.
NOTE: No pressure reduction valve is required unless the inlet water pressure exceeds
1200kPa at any time.
COLD WATER CONNECTION
Refer to Dimensions diagrams on page 8 for the position of connection.
The outlet connection is male thread R3/4" (20mm) and requires union connection to
allow for removal of the unit.
Install the hot water supply line from the unit with a minimum size
of 3/4" (DN20) copper tube.
For units set at 50°C, a minimum of 1.8 metres of 20mm pipe must be run before the first outlet.
Keep the pipe lengths to a minimum and make sure that the pipework is well insulated,
as correct performance of the appliance is dependent on properly insulated pipework.
DO NOT FIT ANY VALVES OR RESTRICTORS TO THE OUTLET OF THE WATER HEATER.
DO NOT FIT ANY OBSTRUCTION TO THE PRESSURE RELIEF LOCATED ON THE HOT
WATER OUTLET CONNECTION.
After purging the air from the system using the hot water supply taps, remove the water
inlet strainer located on the cold water supply inlet connection.
Remove any debris from the filter and replace. When replacing the filter do not
over-tighten the “O”ring seal.
HOT WATER CONNECTION

111111
GAS CONNECTION
ELECTRICAL CONNECTION
Fit a union to the water heater gas inlet for easy connection and removal. The thread
diameter is R3/4” (20mm).
THIS DOES NOT INDICATE THE SIZE OF THE GAS SUPPLY. Refer to AS/NZS 5601 for
guidance on pipe sizing.
Fit an approved isolating gas valve and a disconnection union into the supply line
adjacent to the water heater gasconnection.
Ensure that the supply pipe and the gas pressure regulator (Propane or Natural Gas) has
sucient flow capacity for this and other appliances connected to the fitting line.
For Propane appliances ensure that gas cylinders are of sucient size. The water heater
alone will require a regulator of 4KG per hour capacity.
Before connecting the appliance to the gas service, purge any debris or air from the gas
service. Venting of purged gas must occur in an area free of sources of ignition.
Close the isolating gas valve prior to connection of the appliance.
After connection, check all joints for leaks with an approved leak tester.
Refer to AS/NZS 5601 Installation Code for pipe sizing details.
The unit has a maximum hourly gas consumption of 173 MJ/h.
If the gas pipe sizing is insucient, the customer will not obtain the full performance
benefit. Gas pipe sizing must consider the gas input to this appliance as well as all the
other gas appliances in the premises.
Service calls are chargeable for units installed with incorrect pipe sizes.
The appliance is equipped with a three pinned earthed plug to be connected to a 240V
50Hz power supply. The electrical rating of the appliance is 0.66 Amp/0.44 Amp for the
anti-frost heater active/inactive respectively.
The appliance requires a 240V 50Hz weatherproof power outlet installed in a protected
position adjacent to the appliance.
IMPORTANT: The appliance should always be disconnected from the power supply before
any maintenance is carried out.
Danger: In the case that the water piping is accidentally connected to gas connection port, all
parts of gas circuit must be replaced. If the unit is operated without replacement, it may cause
gas leakage, explosion or fire.

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
12
This unit generates condensate continuously at a rate of up to 5 litres per hour as a by-
product of the highly ecient gas burner system.
This condensate must be drained via a pipe to a suitable point of discharge. As the
condensate is a by-product of gas combustion, it is mildly acidic.
For this reason, copper tube and fittings MUST NOT be used, as they will corrode.
The unit has an in-built condensate neutralizer to make the condensate safe for discharge.
It is recommended to use DN15 high pressure PVC pipe and fittings for the condensate
drain line.
CONDENSATE DRAIN
IMPORTANT CONSIDERATIONS FOR THE CONDENSATE DRAIN PIPE
The content of AS/NZS 3500 'Temperature/Pressure Relief and Expansion Control Valve
Drain Lines' has been used as a guide in preparing these considerations.
DRAINAGE OF CONDENSATE WATER
Condensate drain outlet connection, R1/2" (15mm) BSP male nylon.
Note: the white plastic shipping cap MUST BE removed from the condensate drain outlet
prior to water heater operation. In the case that white-ish stone pieces (calcium carbonate)
comes out of the neutralizer when the cap is removed, they should be discarded.
The condensate drain line must have a continuous fall (of at least 2°) from the water
heater to the discharge point. Lengths and bends must be in accordance with 'Length and
changes of direction' diagram below.
LENGTHS AND CHANGES OF DIRECTION
Max relief drain length (m) 9 8 7 6
Max numbers of changes of direction (greater than 45°) 3 4 5 6
Drain outlet
2° fall
Fix with pipe clip
PVC piping

131313
CONDENSATE DRAIN
INSTALLATION
1. The drain line MUST NOT discharge onto electrical connections, earth stakes, copper
pipes, concrete paths or into a pond.
2. The point of discharge from each drain line shall be located so that the release of
condensate does not cause a nuisance, is readily discernable and incurs no risk of damage
to the building.
In view of (1) and (2), suitable points of discharge are deemed to be drains or sewers.
3. There shall be no tap, valve, or other restrictions in any line.
4. The drain line shall fall continuously to the approved point of discharge.
5. Where discharging over a tundish or gully trap, drain lines shall have an air gap of a size
at least twice the diameter of the drain line.
INTERCONNECTION OF CONDENSATE DRAIN LINES
Condensate drain lines from multiple water heaters may be joined together provided they
conform with the 'GENERAL' requirements on page 6.
COMMON STACK DISCHARGE
Where individual water heaters are installed in a multi-story building, the condensate drain
line may discharge into a common stack, subject to the following:
(a) The discharge from the common stack is to a tundish, having a discharge line that is not
less than the size of the common stack, directly connected to a fixture trap, and installed in
connection with any adjacent soil or waste stack.
(b) The discharge point of the common stack is such that any discharge is readily visible
and not cause any nuisance.
(c) The common stack is vented by extending the pipe upwards above the roof level.
TUNDISH DRAIN LINES
The drain line from any tundish shall not be less than DN20 or less than one size larger than
that of the largest drain line discharging into the tundish. Tundish drain lines shall comply
with the 'GENERAL' requirements on page 6.
PLEASE NOTE
The warranty will not cover any failures or operating diculties due to the following:
• improper installation and maintenance (including but not limited to):
• condensate damage or any other consequential loss either directly or indirectly
• removal of the neutralizer
• not replacing the neutralizer at the end of it's life

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
14
3. CONNECTION OF THE CABLE TO THE THERMANN UNIT
1. Remove the front cover from the unit.
2. Install the cable to the Thermann main unit using conduit or by concealing the cables in
the wall cavity.
3. Install the cable into the cabinet through the conduit in accordance with the following
table.
4. Based on 'How to fix the cables', attach the cable to the plate adjacent to the terminal
block, using the cable clamp provided.
5. Attach the cables to the terminals for the remote controllers.
6. Replace the front cover of the water heater.
IMPORTANT
DO NOT locate the remote controllers where they may come into contact with water.
DO NOT position the remote controllers in the vicinity of chemicals.
DO NOT position the remote controllers over a cooker, grill oven or toaster.
DO NOT position the remote controllers where materials may spill onto them.
1. NUMBER OF CONTROLLERS
One, two or three remote controller panels can be installed as optional extras.
2. CONTROLLER LOCATIONS
The remote controllers allow the water temperature to be set from the various locations
where they are installed at kitchen, laundry, bathroom and ensuite.
REMOTE CONTROLLERS
CONDENSATE DRAIN
AREAS SUBJECT TO FREEZING
In areas where water pipes are prone to freezing, the drain pipe from any valve shall be
insulated and not exceed 300mm in length. It shall discharge into a tundish through an
air gap of not less than 75mm and not more than 150mm measured from the outlet of the
drain pipe to the rim of the tundish.
TESTING THE WATER HEATER AFTER INSTALLATION IS COMPLETED.
Turn on power supply to the heater and allow approximately 30 seconds for the computer to
perform a safety check. Open a hot water tap and check the temperature of the hot water supplied.
The burners will not light if the flow rate is less than 3L/min.
IF THE UNIT FAILS TO OPERATE, CONSULT THE FAULT MONITOR (LAST TWO PAGES).
The installer must check appliance operation at the completion of installation.

151515
REMOTE CONTROLLERS
L SM SMS
180mm
270mm
KNOT
KNOT
180mm
KNOT
180mm
KNOT
KNOT
270mm
KNOT
270mm
KNOT
KNOT
3. CONNECTION OF CABLE TO THE THERMANN UNIT
1. Remove the front cover from the unit.
2. Install the cable to the Thermann main unit using conduit or by concealing the cables
in the wall cavity.
3. Install the cable into the cabinet through the conduit in accordance with the table below.
4. Based on “How to fix the cables”, attach the cable to the plate adjacent to the terminal block,
using the cable clamp provided.
5. Attach the cables to the terminals for the remote controllers.
6. Replace the front cover of the water heater.
How to fix the cables (Remote controller cable(s) and cascade cable)
Number of cable
How to tie the
cable(s) at the
power cable
entry
Required cable clamp
How to fix the
cable(s)
The length
between the knot
and the cable
terminal
How to connect
the cable(s) to
the terminal
1 2 3 4*
Make a knot Tie two cables
Tie two cables and
make a knot on the
rest cable
Tie the cables
two by two
Clamp (small) Clamp (medium) 1 cable:clamp (small)
2 cables:clamp (medium)
1 cable:clamp (small)
3 cables:clamp (large)
180mm 180mm 1 cable:270mm
2 cables:180mm
2 cables:270mm
2 cables:180mm
Attach the cable to
underside of terminal
Attach the cables to
underside of terminal
Attach the cable(180mm)
to underside of terminal
Attach the cables(270mm)
to upperside of terminal
Attach the cables(180mm)
to underside of terminal
Attach the cables(270mm)
to upperside of terminal
* Up to three remote controller can be installed. In this case, three remote controller cables and one cascade cable shall be connected.
4. HOW TO FIX THE CABLES (REMOTE CONTROLLER CABLE(S) AND
CASCADE CABLE)
*Up to three remote controllers can be installed. In this case, three remote controller cables
and one cascade cable is being connected.

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
16
REMOTE CONTROLLERS
5. INSTALLATION OF REMOTE CONTROLLERS
Safety precautions
• Disconnect the heater from the power supply before connecting remote
controller cables.
• Do not install a remote controller above a heat source such as a hot plate
or a kitchen range. The heat will cause electrical component problems,
or deform the exterior.
• Do not install the main remote controller where it will
be subjected to splashing water or steam from appliances.
• Do not install the remote controller in a position that will be exposed to direct sunlight.
• Do not install the remote controller where any commercial chemicals such as
ammonia, sulfur, chlorine, ethylenic compound and acids etc are used.
• The remote controller cables carry low voltage, 12VDC.
Chemicals
Do Not

171717
Installation
• Before remote controller installation, check the hole position considering
wall stud location.
• Drill a 12mm hole in a wall for the remote controller cable.
• Feed remote controller cable to remote controller wall location. Pull cable end connector
through hole.
• After passing the remote controller cable through the hole, connect to the quick
connector on rear of remote controller and feed spare cable back into wall.
• Detach face plate from the remote controller.
• Fix the remote controller to the wall with screws (2pcs) in the screw holes provided.
Do not tighten the screws excessively, as the screw hole may be damaged. In case of
mounting the remote controller on tile, cement or mortar, use appropriate wall anchors.
Then attach the face plate again.
*Seal the remote controller against the wall by running a bead of suitable sealant
around it. Failure to adequately seal against the wall may result in water intrusion
into the remote controller causing damage.
REMOTE CONTROLLERS
Remote controller
*Sealant
(Only for bathroom)
Wall
Screw
Face Plate
Remote controller cable
Wall anchor
Quick connector

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
18
REMOTE CONTROLLERS
beep
6. INITIAL SETTING OF REMOTE CONTROLLERS
Before using, the following initial setting procedure is necessary for all remote controllers.
The first time the remote controller is connected,
``Lo´´ is indicated on the display.
Select ``Lo´´ or ``Hi´´ by pushing or button.
Hi(temp.) : Kitchen Controller
(Only one controller can be set to ``Hi´´)
Lo(temp.) : Bathroom or Ensuite Controller(s)
After selecting ``Lo´´ or ``Hi´´, press ``ON/OFF´´ button for 5 seconds until a beep is heard.
``Fin´´ will appear on the display after the setting is completed.
When all initial settings have been set, all connected remote controllers will be powered on
automatically indicating ``40°C´´ on the display.
The remote controllers cannot be turned on until the initial setting of ALL connected
remote controllers has been completed.
NOTE: To Reset Remote Controllers
• When completing the kitchen controller’s setting and repeating this procedure for other
(bathroom or ensuite) controllers, ``Hi´´ cannot be selected (only ``Lo´´ is displayed).
• When turning on the remote controller after the initial setting, make sure the hot water
supply temperature is displayed on each remote controller.
• If Bathroom or Ensuite controller is set to ``Hi´´ by mistake, the initial setting will need to
be cancelled to change the setting back to ``Lo´´.
• To cancel the initial setting, push ``ON/OFF´´ button and ``Priority´´ button
simultaneously for 5 seconds. When the setting is cancelled, ``Lo´´ is indicated on
the display. Then perform the initial setting procedure again.

191919
REMOTE CONTROLLERS
7. COMMISSIONING AND TESTING
After completing the installation of the unit, turn the water, power and gas supplies
on to theunit.
8. OPERATION OF REMOTE CONTROLLERS
Turn the remote controller in a kitchen ON by pressing the ON/OFF button. The ON
indicator will illuminate.
The digital monitor will indicate 40°C and the priority indicator will illuminate.
Using the or buttons select the hot water temperature required. Turn on the hot
water supply tap. The ``In Use´´ indicator will show that hot water is being supplied.
Move to the remote controller in a bathroom and/or ensuite (if fitted). Press the PRIORITY
BUTTON and repeat the procedure.
THERE ARE NO MINOR ADJUSTMENTS THAT CAN BE MADE TO THE UNIT.
CONFIRM IGNITION, COMBUSTION AND EXTINCTION.
Check ignition, combustion and extinction of the unit by the ``In Use´´ indicator
light of the remote controllers.

Thermann Installer's Manual
Gas Continuous Flow Condensing Water Heaters
20
REMOTE CONTROLLERS
YST-2807
(Universal Controller)
This remote controller is intended to be used in the kitchen, laundry room, bathroom
and ensuite.
The unit will deliver the selected temperature as follows:
Kitchen Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49*, 50*, 55*, 60*, 65*, 70* and 75°C*
Bathroom Controller:
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48°C
*Only for 60°C model
ON Indicator
Indicates power is on
to the system.
UP/DOWN Button
Increase or decrease the
desired water temperature.
ON/OFF Button
Power switch to operate
this remote controller.
In Use Indicator
Indicates that a hot
water tap is open.
High Temp. Indicator
Indicates the setting
temperature is higher
than 50゜ C.
Digital Monitor
Indicates the selected water temperature.
Error messages flash in the event of failure.
PRIORITY Indicator
Indicates this remote
controller has priority
control over the other
remote controllers.
PRIORITY Button
PRIORITY Button to set the
water temperature on this
remote controller.