andrews WHX56 User manual

Working towards
a cleaner future
FASTflo (external)
Installation Guide, Operation and Maintenance Manual
This manual must be kept with the appliance October 2010
Part No E799
Continuous Flow Wall Hung Balanced Flue
Water Heaters for Natural Gas and LPG
WHX56, LWHX56

SECTION XX •
2
Reproduction of any information in this publication by any method is not permitted
unless prior written approval has been obtained from Andrews Water Heaters.
Andrews Storage Water Heaters have been designed and manufactured to comply
with current international standards of safety. In the interests of the health and safety of
personnel and the continued safe, reliable operation of the equipment, safe working
practices must be employed at all times. The attention of UK users is drawn to their
responsibilities under the Health and Safety Regulations 1993.
All installation and service on Andrews Water Heaters must be carried out by properly
qualified personnel and, therefore, no liability can be accepted for any damage or
malfunction caused as a result of intervention by unauthorised personnel.
Andrews Water Heaters’ policy is one of continuous product improvement and,
therefore, the information in this manual, whilst completely up to date at the time of
publication, may be subject to revision without prior notice.
Further information and assistance can be obtained from:
Andrews Water Heaters
Wood Lane, Erdington,
Birmingham B24 9QP
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.andrewswaterheaters.com
Copyright Andrews Water Heaters 2010
INTRODUCTION
2

3
CONTENTS
PAGE
GENERAL AND SAFETY INFORMATION 4
SECTION 1 INCLUDED ACCESSORIES 7
SECTION 2 OPTIONAL ACCESSORIES 7
SECTION 3 QUICK CONNECT MULTI SYSTEM INSTALLATION 8
SECTION 4 BEFORE INSTALLATION 9
SECTION 5 CHOOSING INSTALLATION SITE 10
SECTION 6 INSTALLATION CLEARANCES 11
SECTION 7 INSTALLATION 12
SECTION 8 GAS PIPING 13
SECTION 9 WATER PIPING 14
SECTION 10 ELECTRICAL WIRING 15
SECTION 11 COMMISSIONING 17
SECTION 12 DIMENSIONS 19
WIRING DIAGRAM 20
SECTION 13 REMOTE CONTROLLER INSTALLATION 21
SECTION 14 SERVICING 22
SECTION 15 DISASSEMBLY 22
SECTION 16 SERVICING PARTS LIST 32
SPECIFICATIONS 39
3

The Andrews Water Heater has been designed for use
with NATURAL GAS OR LPG and is manufactured to give
an efficient, reliable and long service life.
To ensure the continued, trouble-free operation of your
heater at maximum efficiency, it is essential that correct
installation, commissioning, operation and service
procedures are carried out strictly in accordance with the
instructions given in this manual. By law, installation and
commissioning of the heater must be carried out by
properly qualified personnel.
The heater(s) must be installed in accordance with the
following requirements:
The current GAS SAFETY (INSTALLATION AND USE)
REGULATIONS
The current BUILDING REGULATIONS
The WATER SUPPLY (WATER FITTINGS)
REGULATIONS 1999
Additionally, installation should be performed in
accordance with all relevant requirements of the Gas
Supplier, Local Authority and recommendations of the
British Standards and Codes of Practice detailed below.
BRITISH STANDARDS AND CODES
OF PRACTICE
BS 6700: 1997 Specification for design, installation,
testing and maintenance of services supplying water for
domestic use within buildings and their curtilages. This
standard supersedes the following British Standards and
Codes of Practice: CP99, CP310, CP324, 202, CP342
Part 2, Centralised Hot Water Supply.
BS 5440:1990 Installation of flues and ventilation for gas
appliances of rated output not exceeding
60kW.
Part 1 Specification for installation of flues.
Part 2 Specification for installation of ventilation
for gas appliances.
BS 5546:1990 Installation of gas hot water supplies for
domestic purposes.
BS 6891 Installation of low pressure gas pipework
of up to 28mm in domestic premises.
BS 6644 Installation of gas fired water boilers of
rated inputs between 60kW and 2mW
BS 7206:1990 Specification for unvented hot water
storage units and packages.
I/M2 Purging procedures for non-domestic gas
installations.
I/M5 Soundness testing procedures for
industrial and commercial gas
installations.
I/M11 Flues for commercial and industrial gas
fired boilers and air heaters.
I/M16 Notes on installation of gas pipework
(excluding 25mm and below).
LPGA Code of practice 7:
Storage of full and empty LPG cylinders
and cartridges. Highly Flammable Liquids
and Liquid Petroleum Gases Regulations
1972.
IGE/UP/10 Part 1 Edition 2:
Installation of Gas Appliances in Industrial
and Commercial Premises.
Terms:
a. Andrews Water Heaters accepts no liability for any
damage resulting from failing to accurately follow the
instructions.
b. When replacing parts during maintenance, only original
parts from Andrews Water Heaters should be used;
these can be recognised by the name of the
manufacturer printed on them.
HEALTH AND SAFETY REGULATIONS
1993
It is the duty of manufacturers and suppliers of products
for use at work to ensure, so far as is practicable, that
such products are safe and without risk to health when
properly used, and to make available to users adequate
information about their safe and proper operation.
Andrews Water Heaters should only be used in the
manner and purpose for which they are intended and in
accordance with the instructions in this manual. Although
the heaters have been manufactured with paramount
consideration to safety, certain basic safety precautions
highlighted in this manual must be observed by the user.
It is imperative that all users of the heaters must be
provided with all the information and instruction necessary
to ensure correct and safe operation.
GENERAL SAFETY INFORMATION
4
GENERAL AND SAFETY INFORMATION

GENERAL SAFETY INFORMATION
EFFECTIVENESS IN COMBATING
LEGIONELLA
Water systems in buildings have been associated with
outbreaks of Legionnaires’ Disease, particularly in health
care facilities where occupants are significantly more
susceptible to infection.
In recognition of the risks in hospitals, a Code of Practice
for the Control of Legionella in Health Care premises has
been issued by the Department of Health (1991). Codes of
Practice applicable to other premises have been published
by other organisations, principally the Health and Safety
Executive (HS)(G70) and the Chartered Institute of Building
Services Engineers (CIBSE, TM13).
All Codes of Practice draw attention to the design and
operation of water systems with reference to avoidance of
factors that favour colonisation by Legionella bacteria.
These factors include stagnation, lukewarm conditions
(20°C to 45°C) and the accumulation of debris, scale and
corrosion in the base of tanks and calorifiers.
Andrews Water Heaters have commissioned an
independent evaluation of their products to investigate
their resistance to build-up of Legionella bacteria.
Experiments were conducted to determine whether,
following a substantial challenge by legionella
pneumophilia. After overnight and stagnation, the system
was rendered free from viable recoverable legionella. It
was found that at 61°C, following a challenge of
approximately 107 organisms per litre, within one hour,
more than 99.999% of organisms had been killed. After a
subsequent stagnation period, sampling did not reveal any
residual contamination. The design of the base of the
water heater precludes legionella colonisation, even after
build-up of debris. The burner positioning ensures that the
water at the bottom of the heater reaches the same, or
higher, temperatures as in the rest of the heater.
Based on data obtained through experiment, the Andrews
Water Heater can be described as legionella resistant as it
is considered unlikely that, at the temperature tested, the
organism would colonise the water heater and present a
possible health risk.
5
WARNING: If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury or death.
- Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service
agency or the gas supplier.

Potential dangers from accidents during installation and use are divided into the following three
categories. Closely observe these warnings, they are critical to your safety.
Prohibited Disconnect
Power Earth Be sure to do
• Failures and damage caused by erroneous work or work not as instructed in this manual are not
covered by the warranty.
• Check that the installation was done properly in accordance with this Installation Manual upon
completion.
• After completion of installation, be sure to hand the Operation Manual to the customer upon filling
in all of the required items.
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully,
and follow the installation instructions.
Caution
WARNING: If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Installation Manual
GAS WATER HEATER
WHX56, LWHX56 (External)
Warning
Caution
Danger Danger of serious injury or even death as well as danger of fire when the
product is misused by ignoring this symbol.
Possibility of serious injury or even death as well as possibility of fire when
the product is misused by ignoring this symbol.
Possibility of bodily injury or damage to property when the product is
misused by ignoring this symbol.
• The appliance must be installed in accordance with the Gas Safety (Installation and Use) Regulations
and the rules in force in the country of installation.
• The manufacturer's instructions supplied.
• The Gas Safety (Installation and Use) Regulations.
• The appropriate Buildings Regulations either The Building Regulations, The Building Regulations
(Scotland), The Building Regulations (Northern lreland).
• In IE, the installation must be carried out by a competent person and installed in accordance with the
current edition of I.S.813 "Domestic Gas Installations", the current Building Regulations and reference
should be made to the current ETCI rules for Electrical Installation.
SAR8285-2
*SAR8285 C*
GENERAL SAFETY INFORMATION
6

INCLUDED & OPTIONAL ACCESSORIES 7
2. Optional Accessories
The accessories listed below are not
included with the units, but may be necessary
for installation.
Part Shape Q’ty
1. Included Accessories
The following accessories are included with the unit.
Check for any missing items before starting installation.
Q’tyShapePart
Tapping Screw
1
Part Shape Q’ty
5
Installation Manual
(this document)
1
Owner's Guide
Part Shape Q’ty
Quick Connect
Cord 1
1
Remote Controller
*One remote controller per controller per application is required
*

3.
Quick Connect Multi System Installation
• The Quick Connect Multi System allows the installation of two units together utilizing only the Quick
Connect Cord.
Typical Plumbing
The Quick Connect Cord is 2m. long. Install the two units 470mm-950mm apart at the center to
ensure the cord will be able to reach between the units. (See Typical Plumbing diagram).
(If the distance between the two units is too great, not only will the cord not be able to reach,
but the water temperature may also become unstable because of the difference in pipe length
between the two units.)
* When connecting 2 devices, use only a
single remote controller.
Note: Connect the remote
controller to only one
of the devices.
System Diagram
• Insulate the hot water piping to prevent heat loss. Insulate and apply heating materials to the cold
water supply piping to prevent heat loss and freezing of pipes when exposed to excessively cold
temperatures.
G
Quick Connect
Cord
Remote Controller Cord Gas Supply Piping
Cold Water Supply
Hot Water
Remote Controller
Terminal Block
Cord
Connector
Cord
Connector
Leave enough clearance around the plumbing
to apply insulation. It will be necessary to add
bends to the piping to ensure that this
clearance is available.
Size the piping to allow for the maximum
flow rates of the units.
Union
Distance at center: 470 - 950mm.
Quick Connect
Cord Union
Gas Valve
Union
Shutoff
Valve Shutoff Valve
Hot Water
Shutoff
Valve
Cold Water
Distance on sides
5 - 480mm.
Make this distance as short as possible.
* The hot water temperature will
become unstable as the pipe
length increases.
QUICK CONNECT MULTI SYSTEM INSTALLATION
8

BEFORE INSTALLATION 9
4
Check the Gas
• Check that the rating plate indicates the correct type of gas.
Check that the gas supply line is sized
for 62.3 kW(or 49.0 kW) for this unit.
Check the Power
• The power supply required is 230V AC,
at 50Hz. Using the incorrect voltage
may result in fire or electric shock.
Do Not Use Equipment for Purposes Other Than Those Specified
• Do not use for purposes other than increasing the temperature of the water supply,
as unexpected accidents may occur as a result.
Check Water Supply Quality
• If the water supply is hard, acidic or otherwise impure, treat the water with approved methods in
order to ensure full warranty coverage.
Use Extreme Caution if Using With A Solar Pre-Heater
• Using this unit with a solar pre-heater can lead to unpredictable output temperatures and
possibly scalding. If absolutely necessary, use mixing valves to ensure output temperatures do
not get to scalding levels. Do not use a solar pre-heater with the quick-connect multi-system.
Checkup
• Check the fixing brackets yearly for damage or wear. Replace if necessary.
4. Before Installation
Caution

Caution
• The water heater is designed for external installation only. Never
install it indoors or in a bathroom.
• Consult with the customer concerning the location of installation.
• Avoid places where fires are common, such as those where
gasoline, benzene and adhesives are handled, or places in which
corrosive gases (ammonia, chlorine, sulfur, ethylene compounds,
acids) are present.
This may cause incomplete combustion or failures.
• Locate the water heater so that there are no obstacles around the
termination and so that exhaust can't accumulate. Do not enclose the
termination with corrugated metal or other materials.
• Install the water heater in an area that allows for the proper clear-
ances to combustible and noncombustible construction. Consult the
rating plate on the appliance for proper clearances.
• Do not install the water heater in a place where it may be threatened
by falling objects, such as under shelves.
• Do not install the water heater where the exhaust will blow on outer
walls or material not resistant to heat. Also consider the surro-
unding trees and animals.
The heat and moisture from the water heater may cause discolo-
ration of walls and resinous materials, or corrosion of aluminum
materials.
• Avoid installation in places where dust or debris will accumulate.
Dust may block the air-supply opening, causing the performance of
the fan motor to drop and incomplete combustion to occur as a result.
• Install in a location where the exhaust gas flow will not be
affected by fans or range hoods.
• Take care that noise and exhaust gas will not affect neighbors.
• Avoid installation in places where special chemical agents
(e.g., hair spray or spray detergent) are used.
Ignition failures and malfunction may occur as a result.
5. Choosing Installation Site
* Locate the appliance in an area where leakage from the unit or connections will not result in damage
to the area adjacent to the appliance or to the lower floors of the structure. When such locations
cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed
under the appliance. The pan must not restrict combustion air flow.
Internal
installation
CHOOSING AN INSTALLATION SITE
10

INSTALLATION CLEARANCES 11
6. Installation Clearances
Item
Distance from combustibles
• Maintain the following clearances
from both combustible and
non-combustible materials.
• There must be a clearance of 600mm or
more in front of the exhaust terminal.
• This restriction will not be applied to an
area where an effective shield makes a
clearance of 600mm or more in front of
the exhaust outlet.
Check Illustration
Caution
Clearances to Opening
into Any Building
Combustibles
300 mm
or more
Combustibles
Combustibles
Combustibles
Combustibles
150 mm
or more
150 mm or more
600 mm
or more
10 mm
or more
There must be no
building opening
within this area.
150 mm
or more 150 mm or more
150 mm
or more
300 mm
or more
Before installing, check for the following:
Install in accordance with relevant building and mechanical codes, as well as any local, state or
national regulations.

Illustration
7. Installation
Check
4. Drill holes for the remaining four screws.
5. Hang the unit again by the first screw, and then
insert and tighten the remaining four screws.
6. Take waterproofing measures so that water does
not enter the building from screws mounting the
device.
• Make sure the unit is installed securely so that it will
not fall or move due to vibrations or earth-quakes.
Securing to the wall
Mounting Bracket
(upper)
Tapping Screw
Location of Screw Hole
1. Drill a single screw hole, making sure to hit a stud.
2. Insert and tighten the screw and hang the unit by
the upper wall mounting bracket.
3. Determine the positions for the remaining four screws
(two for the top bracket and two for the bottom), and
remove the unit.
• The weight of the device will be applied to the wall. If the strength of the wall is not suffi-
cient, reinforcement must be done to prevent the transfer of vibration.
• Do not drop or apply unnecessary force to the device when installing. Internal parts may
be damaged and may become highly dangerous.
• Install the unit on a vertical wall and ensure that it is level.
Locating Screw Holes
Locating Screw Holes
Mounting
Structure
Caution
• When installing with bare hands,
take caution to not inflict injury.
• Be careful not to hit electrical
wiring, gas, or water piping while
drilling holes.
Item
Part number:E528, Stainless Mesh Guard
Manufacturer Details: KDS Engineering Limited
Unit 7, Moor Street Industrial Estate
Moor Street
Brierley Hill
West Midlands
England
DY5 3ST
Terminal Guards
A terminal guard is required if persons could come into contact with the terminal or the terminal
could be subject to damage.
If a terminal guard is required, it must be positioned to provide minimum of 50 mm clearance from
any part of the terminal and be central over the terminal.
INSTALLATION
12

GAS PIPING 13
Measuring Gas Pressure
In order to check the gas supply pressure to the unit, a
tap is provided on the gas inlet. Remove the hex head
philips screw from the tap, and connect a manometer
using a silicon tube.
Follow the instructions from the gas supplier.
8. Gas Piping
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressures in excess of 35 mbar.
The Appliance must be isolated from the gas supply piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply piping system at test pressures equal to or less than
35 mbar.
The appliance and its gas connections must be leak tested before placing the appliance in operation.
The inlet gas pressure must be within the range specified. This is for the purposes of input adjustment.

9. Water Piping
This appliance is suitable for potable water. Do not use this appliance if any part has been underwater. Immediately
call a qualified service technician to inspect the appliance and replace any part of the control system and gas control
which has been under water.
If the water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold
water supply line, means shall be provided to control thermal expansion. Contact ANDREWS WATER HEATERS
TECHNICAL DEPARTMENT FOR ADVICE.
Piping and components connected to the water heater shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment, shall not be introduced into the potable water.
A water heater used to supply potable water may not be connected to any heating system or components previously
used with a nonpotable water heating appliance.
When water is required in one part of the system at a higher temperature than in the rest of the system, means such
as a mixing valve shall be installed to temper the water to reduce the scalding hazard.
• Flush water through the pipe to clean out metal powder, sand and dirt before connecting it.
• Take appropriate heat insulation measures (e.g., wrapping with heat insulation materials, using electric heaters)
according to the climate of the region to prevent the pipe from freezing.
•
Use a union coupling or flexible pipe for connecting the pipes to reduce the force applied to the piping.
• Do not use piping with a diameter smaller than the coupling.
• When feed water pressure is too high, insert a depressurizing valve, or take water hammer prevention measures.
• Avoid using joints as much as possible to keep the piping simple.
• Avoid piping in which an air holdup can occur.
• Use approved piping materials.
• If installing the unit on a roof:
If the unit is installed on a roof to supply water to the levels below, make sure that the water pressure supplied to
the unit does not drop below 2000 mbar. It may be necessary to install a pump system to ensure that the water
pressure is maintained at this level.
Check the pressure before putting the unit into operation.
Failing to supply the proper pressure to the unit may result in noisy operation, shorter lifetime of the unit, and
may cause the unit to shut down frequently.
Supply water piping
• Do not use PVC piping.
• Mount a check valve and a shut off valve (near
the inlet).
• In order for the client to use the water heater
comfortably, 1000 mbar to 5000 mbar of pres-
sure is needed from the water supply.
Be sure to check the water pressure. If the water
pressure is low, the water heater cannot perform
to its full capability, and may become a source of
trouble for the client.
Drain piping
• Expansion water may drop from the pressure
prevention device and wet the floor. If neces-
sary, provide drain piping or use a drain hose to
remove the water.
Hot water piping
• Do not use lead or PVC piping.
• The longer the piping, the greater the heat loss.
Try to make the piping as short as possible.
• Use a mixing valve with a low water resistance.
Use shower heads with low pressure loss.
• If necessary, use a pump or other means to en-
sure that the supply water pressure to the inlet
of the heater does not fall below 2000 mbar when
the maximum amount of water is being de-
manded. Also install a pressure meter on the in-
let. If this is not done, local boiling will occur in-
side the water heater causing abnormal sounds
and decreasing the durability of the heat ex-
changer.
Ask a qualified plumber to perform the installation
of the plumbing. Observe all applicable codes.
WATER PIPING
14

ELECTRICAL WIRING 15
Do not connect electrical power to the unit until all electrical wiring has been completed.
Consult a qualified electrician
for the electrical work.
10. Electrical Wiring
Do not turn on the power until the electrical wiring is finished.
This may cause electrical shock or damage to the equipment to occur.
Caution
• The electrical supply required by the water
heater is 230V AC at 50 Hz.
The power consumption may be up to 135W.
Use an appropriate circuit.
• Do not disconnect the power supply when not
in use. When the power is off, the freeze
prevention in the water heater will not acti-
vate, resulting in possible freezing damage.
• Do not let the power cord contact the gas piping.
Tie the redundant power cord outside the
water heater. Putting the redundant length of
cord inside the water heater may cause elec-
trical interference and faulty operation.
Ground
• To prevent an electric shock, always plug power
lead into an earth powerpoint.
i) "A means of disconnection from the supply mains having a contact separation in all poles must be pro-
vided to allow for full disconnection".
ii) Under voltage Cat III conditions should be incorporated in the fixed wiring in accordance with the wiring
regulations.
iii) "If the supply cord is damaged, it must be replaced by the manufacturer or its service agent".
This appliance must be electrically grounded in accordance with Electrical Authority Regulations.
External wiring must be correctly earthed, polarised and in accordance with the relevant standards.
In GB this is BS 6891.
In IE this is the current edition of I.S.813 "Domestic Gas Installations".
The boiler must be connected to a permanent 230 V ac, 50Hz supply.
Connection of the whole electrical system of the boiler, including any heating controls, to the electrical supply
must be through one common isolator and must be fused 10 Amp maximum.
Isolation should be by a double pole switched fused spur box, with a minimum gap of 3 mm for both poles.
The fused spur box should be readily accessible and preferably adjacent to the appliance. It should be
identified as to its use.
Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.
Verify proper operation after servicing.
Field wiring to be performed at time of appliance installation.
THE APPLIANCE MUST BE EARTHED

1. Remove the front cover of the heater (4 screws).
2. Pass the remote controller cord through the wiring
throughway and into the unit.
3. Connect the Y terminals at the end of the remote
controller cord to the terminal block.
4. Secure the remote controller cord with a clamp.
5. Replace the front cover.
Remote controller cord
Remote controller cord
• Use Remote controller cord for any extensions.
• Install according to the National Electrical Code and all applicable local codes.
Connecting Remote Controller Cord to Unit
• Keep the remote controller cord away from the freeze prevention heaters in the unit.
• Tie the redundant cord outside the water heater. Do not put the extra length inside the equipment.
• The remote controller cord can be extended up to 100m with Remote controller cord.
• Use a Y type terminal with a resin sleeve. (Without the sleeve, the copper wire may corrode and
cause problems).
• Be sure to hand tighten when screwing to the terminal block. Power tools may cause damage to the
terminal block.
Clamp
Terminal Block
Wiring
Throughway
• Applicable Model
Remote Controller
Remote controller RC-7508M
WHX56, LWHX56
Main
* Up to three remote controllers can be connected. Additional remote controllers cannot be con-
nected by themselves.
•The remote controller must be installed in accordance with the installation manual enclosed in the
package.
•Cannot be used without a remote controller.
ELECTRICAL WIRING
16

COMMISSIONING 17
Handling after trial operation
• In Freezing areas: If the unit will not be used immediately, close off all gas and water shutoff
valves, drain all of the water out of the unit and the plumbing system to prevent the unit
and system from freezing, and bleed the gas out of the gas line.
Freezing is not covered by the warranty.
Caution
(1) Open a hot water fixture and confirm that the "Burner On" lamp comes on, and that hot water is
being produced. (If necessary, repeat until the air in the gas piping is bled out).
* White smoke may be noticed from the exhaust vent during cold weather. However, this is not a
malfunction of the unit.
* If an “11” error code appears on the remote controller, turn the unit off and then back on again,
and then open a hot water fixture again.
(2) Change the temperature setting on the remote controller and check that the water temperature changes.
(3) Check the secondary gas pressure.
The regulator on products is electronically controlled and pre-set in factory.
It does not require adjustment on installation under normal condition.
Perform the following procedure only if the unit is operating incorrectly and all other possible
causes have been eliminated.
1) Turn off the gas supply.
2) Turn off power supply.
3) Remove the front panel from the appliance.
4) Attached pressure gauge to gas pressure checking point. (Fig.1)
5) Turn on the gas supply
6) Turn on power supply
7) If remote controllers are fitted, turn the unit “ON” at the remote
controller; open a hot water tap fully.
Caution: Do not touch hot water outlet during this procedure.
8) Check the gas pressure at gas pressure checking point.
Refer to “Specification” on page 2.
• If the water heater does not operate normally, refer to “Troubleshooting”
in the Operation Manual.
* After the trial operation, clean the filter in the cold water inlet.
11. Commissioning
The installer should test operate the unit, explain to
the customer how to use the unit, and give the owner
this manual before leaving the installation
• Preparation ... (1) Ensure all lines are purged / flushed of debris prior to connection to appliance.
(2) Open the shut off valve on the water supply, check that water passes through the
valve and close the valve.
(3) Open the gas supply valve, turn on the power supply, and turn on the Operation
switch on the remote controller (the Operation lamp turns on) .
NOTE: The appliance has been factory set and no adjustment is necessary.
<If installed with a quick connect multi-system>
• Turn the system power on with the remote controller.
• Slowly open a hot water fixture and check that the units ignite sequentially. Check to see that the
hot water temperature is the same as the temperature displayed on the remote controller. (*1)
* If inlet water temperature is high, and both units do not ignite at the same time, switch which
unit will ignite first by pressing the Max. or Min. Manifold Pressure Set Button on the circuit
board and then confirm each unit can ignite. (*2)
* If an 11 or F11 error code flashes on the remote controller, hit the Power Button on the remote
controller off and on 2-3 times.
* If (*1) and (*2) cannot be done, the Quick Connect Cord may not be properly connected.
Check that the cord is properly connected.
Unit A Ignites
Unit B Doesn't Ignite
Press Max. or Min. Manifold
Pressure Set Button on Unit B Unit A Doesn't Ignite
Unit B Ignites
(Fig.1)

Lighting Instructions
This water heater does not have a pilot. It is equipped with an ignition device that automatically lights
the burner.
1. Read the safety information in the installation manual or on the front of the water heater.
2. Turn off all electrical power to the unit.
3. Do not attempt to light the burner by hand.
4. Turn the gas control manual valve (external to the unit) clockwise to the off position.
5. Wait five minutes to clear out any gas. If the smell of gas remains, stop, and follow the instructions
on page 4 of this manual.
6. Turn the gas control manual valve counterclockwise to the on position.
7. Turn on electric power to the unit.
8. The unit will now operate whenever hot water is called for. If the unit will not operate, follow the
shutdown instructions and call a service technician.
Shutdown Instructions
1. Stop any water demand.
2. Turn off electric power.
3. Turn the gas control manual valve clockwise to the off position.
Should overheating occur, or the gas supply fail to shut off, turn off the gas control manual valve to the
appliance.
COMMISSIONING
18

DIMENSIONS 19
4
12. Dimensions
WHX56, LWHX56 (unit: mm)
LOWER WALL MOUNT
BRACKETS
COLL
GROUND
GAS
HOT
WATER DRAIN VALVE
WATER DRAIN VALVE
(WATER FILTER)
HOT WATER OUTLET
GAS INLET
COLD WATER INLET
WIRING THROUGHWAYS
WATER DRAIN VALVES
39.7
665.2
361
70
450
2345
257 60
450
464
87
170
140
100
70
36
70
170
140
100
36
AIR INLET
BOTTOM
OF CASE
BOTTOM
OF CASE
FLUE COLLAR
HOT WATER OUTLET (3/4)
WIRING THROUGHWAYS
COLD WATER INLET (3/4)
GAS INLET (3/4)
(VIEW FROM TOP)
10 6240
44
51
55
615
10
169
140
60
50
244
UPPER WALL MOUNT
BRACKETS

Wiring Diagram ( WHX56, LWHX56 )
(VACANT CONNECTOR)
BURNER THERMISTOR
BYPASS WATER FLOW
SENSOR
MAIN WATER
FLOW SENSOR
BL
W
G
BL
BL
G
W
BL
R
R
BKBK
GAS VALVE UNIT
EARTH
GAS MANIFOLD
NEUTRAL
VARISTOR
PRIMARY
FREEZE PREVENTION
HEATER
CURRENT LEAKAGE SAFETY DEVICE ARRESTER
10A(FUSE)
HIGH LIMIT
SWITCH
SECONDARY
AC100V
IGNITER
SOLENOID VALVE Q4
SOLENOID VALVE Q3
SOLENOID VALVE Q2
SOLENOID VALVE Q1
SOLENOID VALVE 0
DC90V
A
B
FAN
PULSE
CONTROL
CIRCUIT
FAN MOTOR
A
B
FAN
FAN ROTATION
SPEED INPUT
FAN CONTROL
OUTPUT
DC140V
Sub-CPU
SUB
CONTROL
UNIT
D
INLET WATER THERMISTOR
C
CPU
CENTRAL
PROCESSING
UNIT
FREEZE PROTECTION
THERMISTOR
D
BURNER THERMISTOR
HEAT EXCHANGER
THERMISTOR
OUTLET WATER THERMISTOR
GND
C
5V POWER CIRCUIT
R
W
R
W
R
Y(Pulse)
(VCC)
Y
BL
R
(Pulse)
(VCC)
(GND)
(GND)
BL
Y
R
Y
BL
BL
R
R
BL
<CN63>
BL
R
BL
R
BL
BR
W1
1
2
2
3
3
2
1
12
34
56
78
9
10
12 11
14 13
16 15
15
14
13
12
11
10
9
8
7
5
4
3
2
1
6
18 17
20 19
22 21
24 23
26 25
28 27
30 29
32 31
BR
<CN102>
BL
BL
<CN89>
(UN-USED)
(VACANT CONNECTOR)
MAIN CIRCUIT
BOARD
BL
BL
(G)BK
(BK)G
(W)R
(R)W
BL
BL
G(BK)
BK(G)
W(R)
R(W)
Quick Connect Cord(Optional)
BL
W
W
R
BL
BL
GY
O
BR
BK
W
R
R
BLBL
<CN75>
W
G
R
BK
BK
W
R
G
R
<CN10>
<CN184>
BLBL
(For Quick Connect Multi System Only)
BK
BL
W
GY
BL
O
BR
Minimum Manifold Pressure Set Button
Maximum Manifold Pressure Set Button
Increase Button
Manifold Gas Pressure
Decrease Button
Manifold Gas Pressure
BK
BK
GY
O
BR
O
GY
FREEZE PROTECTION
THERMOSTAT
LIVE
BR
WYO
<CN104>
W
BK
<CN27>
<CN101>
<CN92>
BL
R
R
<CN78> <CN1>
<CN
89A>
R
RBL
BK
GG
<CN160>
<CN102>
POWER CIRCUIT
BOARD
<CN38>
OO
R
11
1
2
3
4
5
6
7
3
2
1
3
4
2
1
2
1
2
1
2
1
4
3
6
5
8
7
2
1
1
1
4
3
6
5
8
7
22
R
O
AIRFLOW CHANGE
-OVER CONNECTOR
(VACANT CONNECTOR)
W
W
W
W
W
W
W
W
W
W
W
W
WW
W
V
BK
W
BK
BK
V
W
BL
R
O
Y
BK
V
BL
Y
O
R
V
BK
GG
BK
W
(VCC)
SM
LS
SM
LS
(GND)
(VCC)
(Fully open)
HEAT EXCHANGER
THERMISTOR
OUTLET WATER
THERMISTOR
MAIN WATER
FLOW CONTROL
VALVE
OPERATING LED
R
Y
G
O
BL
BL
R
O
G
Y
BL
BLBL
R
BL
(VCC)
(GND)
(Fully open)
BLBL
BLBL
REMOTE CONTROLLER
THERMAL FUSE
BYPASS WATER
FLOW CONTROL
VALVE
(VCC) WW
INLET WATER
THERMISTOR
RELAY 9
RELAY 1
RELAY 5
RELAY 2
RELAY 4
RELAY 10
RELAY 3
DC90V
SECONDARY
PRIMARY
DC15V(2)
DC15V(1)
DC140V
BL
W
BL
W
O
Y
O
Y
BKBK W
RR
RELAY 2
RELAY 1
GND
THERMAL FUSE
BYPASS WATER FLOW SENSOR
MAIN WATER FLOW CONTROL VALVE
BYPASS WATER FLOW CONTROL VALVE
MAIN WATER FLOW SENSOR
RELAY 7
RELAY 5
RELAY 9
RELAY 10
DU
FLAME DETECTING CIRCUIT
GAS PROPORTION VALVE
POWER CONTROL CIRCUIT
COLOR CODING
W : White
O : Orange
V : Violet
BK : Black
R : Red
GY : Gray
Y : Yellow
BR : Brown
G : Green
BL : Blue
15V POWER CIRCUIT
EARTH
WW
WW
BL
W
BL
W
GY
BR
BL
BR
BL
GY
TRANSFORMER
WWWW W
WW WWW
WBL/W
WW
W
W
(VACANT CONNECTOR)
EARTH
FLAME ROD
FR
FREEZE PREVENTION HEATER
R
BK
BL
W
W
BL
W (Vs)
BL(GND)
O
Y
BK
W
BR
BR
Y
O
Y (FG)
O (Vsp)
W
W
R
R (Vcc) R
FLAME ROD
(OPTIONAL)
ELECTRODE
FAN MOTOR
HIGH-LIMIT SWITCH
SYSTEM CONTROLLER
BR
BR
BL
W
Y/G
BL
BR
W
BL
BL
BL
EARTH
URRENT LEAKAGE
A
FETY DEVICE
G
FCI)
Y/G
<AC230V>
EARTH
Y/G
EARTH
BR
BL
FREEZE PROTECTION
THERMOSTAT
FREEZE PROTECTION
THERMOSTAT
GY
BR
(UN-USED)
BK
W
BL
IGNITER
RC TERMINAL
RELAY
DRIVING
CIRCUIT
POWER
CONTROLLER
SV3
SV4
AC230V
SV0
SV1
SV2
VARISTOR
IG
Other Unit in Quick Connect Multi System
MAIN CIRCUIT
BOARD
<CN184>
56
1234 561234 897
1
21
B5
IG
1
2
2
1
QS
QS
1
2
11
22
2
3
2
4
5
6
3
2
4
5
6
11
184
6
4
1
2
3
5
6
4
1
2
3
5
6
4
5
3
1
2
5
4
6
2
1
3
FM
1
2
3
1
2
3
1
2
3
5
6
4
1
2
3
5
6
4
2
1
3
DU
10
11
12
SV
0
SV
Q1
SV
Q2
SV
Q3
SV
Q4
13
14
1
2
3
3
2
1
5
6
7
8
4
1
2
3
5
6
7
4
1
1
1
2
3
2
12345123
1
135
246
23
4
1234
657
8765
4321
9
2
3
2
1
1
12122 1121 2
WIRING DIAGRAM
20