andrews WH42 User manual

Working towards
a cleaner future
FASTflo
Owner’s Guide
This manual must be kept with the appliance October 2010
Part No E800
Continuous Flow Wall Hung Balanced Flue
Water Heaters for Natural Gas and LPG
WH42, WH56, WHX56, LWH42, LWHX56, LWH56

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
OWNER’S GUIDE – CONTENTS
PAGE
General Safety Information 4
General Parts
Main Unit 10
Names and Functions of Each Parts 11
Initial Operation 12
How to Use
When using RC-7508M
Clock Adjustment 13
Running Hot Water 14
Setting Hot Water Temperature 15
Filling Up the Bath 17
Confirmation Beeper On/Off 18
Other Setting Options 19
Preventing Damage from Freezing 21
When Unused for an Extended Period 22
Regular Maintenance 24
Troubleshooting 26
Follow-up Service 30
Specifications 31
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.

GENERAL SAFETY INFORMATION
6
Prohibited Don’t
touch.
Don’t
disassemble
the equipment.
Don’t touch
with a wet
hand.
No flame.
High
Temperature.
To prevent damage to property and injury to the user, the icons shown below will be used to warn of
varying levels of danger.
Every indication is critical to the safe operation of the water heater and must be understood and
observed.
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.
Other icons
Danger
Warning
Caution
Denotes content that may result in instantaneous fire, serious injury
and even death when ignored.
Denotes content that may result in fire, serious injury and even
death when ignored.
Denotes content that may result in bodily injury and physical
damage when ignored.
The content following this icon is necessary to understand for safe
and easy use of this water heater.
Remarks
Be sure
to do. Earth
Electric
Shock.
Danger
If you detect a gas leak:
1. Do not try to light any appliance
2. Do not touch any electrical
switch; do not use any phone in
your building.
3. Immediately call your gas
supplier from a neighbor’s phone.
Follow the gas supplier’s
instructions.
4. If you cannot reach your gas
supplier, call the fire department.
Icons warning of risk level
Important Safety Information-1
[Internal installation]
Do not use the water heater if
the intake/exhaust pipe is
displaced,has holes,or is
corroded.
[External installation]
Do not install indoors.
Internal installation

GENERAL SAFETY INFORMATION 7
If you detect abnormal combustion
or abnormal odors, or during an
earthquake, tornado or fire:
1. Turn off the hot water supply
2. Turn off the power to the water
heater
3. Turn off gas and water at the
main
4. Consult the nearest Andrews
Water Heaters agent
Check the temperature of the
running hot water before
entering the shower.
Check the temperature before
stepping into the bath tub.
Do not turn off the water heater or
change the water temperature while
someone is using.
Be sure the gas/power
supplied matches the
gas on the rating plate.
Warning
Contact Andrews Water Heaters
before using with a solar pre-heater.
Contact a qualified service
technician for any necessary
repairs, service or maintenance.
Do not allow small children to play
unsupervised in the bathroom.
Do not allow small children to
bathe unsupervised.
Leave the proper clearance between
the water heater and nearby objects
(trees, timber, boxes with flammable
materials etc.).
Left side:
Min. 50mm Right side:
Min. 50mm
Do not place combustibles such as
laundry, newspapers, oils etc. near
the heater or the exhaust vent
terminal.
Front:
Sug. 600mm*
Do not use combustible chemicals
such as oil, gasoline, benzene etc.
in the vicinity of the heater or the
exhaust vent terminal.
Sug.75 mm
from vent pipe*
Internal installation
vent terminal
Upper:
Min. 50mm
Important Safety Information-2
Do not place or use a spray can
near the heater or the exhaust vent
terminal.
External installation
unit
[Internal installation]
[External installation]
Left side:
Min. 150mm
Right side:
Min. 150mm
*Indicates suggested clearances for
maintenance.
Front:
Sug. 600mm*
Upper:
Min. 300mm

Be sure to electrically ground the
unit.
Do not touch the power cord with
wet hands.
Keep power cord free of dust.
Do not use a broken or modified
power cord. Do not bind, bend or
stretch power cords.
Do not scratch, modify, or subject
them to impact or force.
Do not use the water heater for
other than hot water supply,
shower and bath.
Do not touch the exhaust vent
pipe during or immediately after
operation of the water heater.
Caution
Do not use hair spray or spray
detergent in the vicinity of the
heater.
Do not install in locations where
excessive dust or debris will be
in the air.
If this unit will be installed in a
salon or other location where hair
spray or aerosols will be used,
locate the unit away from where
these products are used.
[Internal installation]
[External installation]
GENERAL SAFETY INFORMATION
8

GENERAL SAFETY INFORMATION 9
Do not drink water that has been inside the
unit for an extended period of time. Do not
drink the first use of hot water from the
unit in the morning.
Clean the filter on the water inlet as fre-
quently as required by the quality of
your local water.
Keep the area around the unit clean.
If boxes, weeds, cobwebs, cockroaches etc. are in
the vicinity of the unit, damage or fire can result.
Do not install the equipment where the
exhaust will blow on walls or windows.
Treat hard, acidic or otherwise impure
supply water with approved methods to
ensure full warranty coverage.
Problems resulting from scale formation
are not covered by the warranty.
Check ignition during use and extinction
after use.
This unit is only approved for installation
up to 1300m. above sea level.
Do not use parts other than those specified
for this equipment.
Do not disassemble the remote controller.
Do not use benzene, oil or fat detergents to
clean the remote controller.
This may cause deformation.
Do not get the remote controller wet.
Although it is water resistant, too much water can
cause damage.
Do not splash water on the remote
controller. Do not expose the remote
controller to steam.
Do not locate the remote controller near stoves or
ovens, this may cause damage or failure.
If the mains electricity and gas are to be
turned off for any long periods during
severe weather, it is recommended that the
whole system, including the boiler, should
be drained to aviod the risk of freezing.
If it is snowing, check the exhaust gas vent
and exhaust vent terminal for blockage.
Remark
Important Safety Information-3

General Parts
Internal Wall Mounted, Power Vent/Sealed Model
WH56, LWH56, WH42, LWH42
*The above illustration shows an example of installation.
The exact installation configuration may be slightly different.
Main Unit
Flue Collar
Burner on indictor
Water Supply Valve
Gas Supply Valve
Water Drain Valve (with Water Filter)
(Inside Water Inlet) (p.22)
Intake pipe
Front Cover
If there is a problem with the unit,
a lamp will flash on the front of
the unit. (p.26)
External Wall Mounted, Power Vent/Sealed Model
WHX56, LWHX56, WHX42, LWHX42
Exhaust terminal
Front Cover
Water Supply Valve
Water Drain Valve (with Water Filter)
Air Inlet
Gas Supply Valve
Burner on indictor
(Ex. WH56)
(Ex. WHX56)
GENERAL PARTS
10

NAMES AND FUNCTIONS OF EACH PART 11
(This page)
Names and Functions of Each Part
Main Remote Controller (RC-7508M)
Display
Set Button
For other settings.
Speaker
Power On/Off Button
For turning the heater on
and off.
Selection Button
• Used to adjust the
temperature. ( P12)
• Used for other settings.
• Details are memorized
upon adjustment or
setting.
The illustration below shows the remote controller display. What is actually displayed depends
on how the water heater is set.
Display
Timer Display
When the hot water tem-
perature is set between 60
- 80°C, “hi-temp” blinks for
10 seconds. ( P13)
High Temperature Display
(Eg.: 40°C)
Selection switches that can
be operated are indicated
by the bar display lighting
up or blinking.
Selection Bar Display
Temperature Setting
This is displayed when
the burner is on.
Burner On Display
(Eg.: 10:15)
Error Display
Error is displayed when
malfunction occurs.
(P26)
< Scroll display > to prevent the remote controller screen from burn-in
* In order to prevent the screen burn-in, about 10 minutes after
any remote control operation, the screen display begins to
scroll sideways.
* As soon as the remote controller is used again, the scrolling
stops.
Current time (when the clock
is set), the hot water tempera-
ture scrolls sideways.
(This page)

Initial Operation
Before the first use of your water heater, make the following preparations.
Follow steps 1 through 4.
1Open the water supply valve.
Open a hot water fixture to confirm that
water is available, and then close the
fixture again.
3Open the gas supply valve.
Hot water fixture
2
Turn on the power.
CLOSED
4
OPEN
(Ex. WH56)
INITIAL OPERATION
12

CLOCK ADJUSTMENT 13
When using RC-7508M
Clock Adjustment
Press the
ON/OFF
button to turn it
“On”.
1
On this Display Operation Description
Press the
SET
button to change the
display until “time
set” is shown.
2
Use the buttons
to adjust the clock.
3
< Completion of setting >
* When the
SET
button is pressed,
or the console is left untouched for
about 20 seconds, the settings
screen ends.
(Eg.: AM 10:15)
* The time changes in 1-minute
increments with each press on the
button, and then in 10-minute
increments if the button is kept
pressed down.
(Eg.: 40°C)
In the event of a power cut or after disconnecting the power supply, when the
power is restored, the clock on the display screen shows “0:00”, so the clock
needs to be re-set.
* The
ON/OFF
is lit.

On this Display Operation Description
1
2
Running Hot Water
When using RC-7508M
(Display example)
Check
Press the
ON/OFF
button to turn it
“On”.
* This is lit during combustion.
Turn on hot water.
Previous set temperature
(Eg.: 40°C)
Whenever using the hot water, such as when using the shower,
check the temperature shown on the remote controller first, and
then test the hot water temperature by hand.
Be especially careful if using hot water after previously using water at 60°C or above to prevent scalding.
While the shower is being used, no one other than the user
should change the temperature, the power switch must not be
turned “off”. (when using sub remote controller.)
WARNING
WARNING
This is to prevent scalding if the temperature rises. Conversely, if the temperature drops or the
power switch is turned “off”, the user may be upset when the water suddenly becomes much colder.
Here
* The
ON/OFF
is lit.
RUNNING HOT WATER
14

SETTING HOT WATER TEMPERATURE 15
On this Display Operation Description
1
2
Setting Hot Water Temperature
Use the
buttons to adjust
the temperature.
(Eg.: 40°C)
Press the
ON/OFF
button to turn it
“On”.
When using RC-7508M
While the shower is being used, no one other than the user
should change the temperature, the power switch must not be
turned “off”. (when using sub remote controller.)
WARNING
This is to prevent scalding if the temperature rises. Conversely, if the temperature drops or the
power switch is turned “off”, the user may be upset when the water suddenly becomes much colder.
Here
* The
ON/OFF
is lit.

• When a high temperature is set, the readout on the
right is shown.
• Please check the temperature displayed before using
any hot water.
Be especially careful using any hot water after any
previous setting of between 60 - 80°C.
Approximate hot water conditions
Washing
dishes, etc.
Shower, hot water supply, etc. Hot water supply, etc. High temperature
37 38 39 40 41 42 43 44 45 46 47 48 50 55 60 65 70 75 80
Set the maximum temperature to suit your own preference. ( P16 and 17)
• Hot water temperatures are approximations, and may differ from actual temperatures depending
on external factors, such as the season and length of piping involved.
• When low temperatures are set (for washing dishes, etc.), if the ambient water temperature is
already quite high, it may be difficult to ensure the resultant water temperature is as per the
setting.
• When the hot water temperature is adjusted using thermostat-controlled water mixing valves, set
the temperature on the remote controller to about 10°C higher than that required to ensure the
appropriate temperature.
When setting high temperatures (60 - 80°C);
(Eg.: 60°C)
Temperature
display flashes for
about 10 seconds
to indicate high
temperature.
Here
SETTING HOT WATER TEMPERATURE
16

FILLING UP THE BATH 17
On this Display Operation Description
1
2
Press the
ON/OFF button
to turn it “On”.
3
Filling Up the Bath
When using RC-7508M
Insert the bathplug into the plughole.
Turn on hot water.
(Display example)
Check
When the bath is full,
turn off the taps.
* Please set to the
highest temperature
when using
thermostat controlled
water mixing valves.
WARNING Check the bathwater temperature with your hand be-
fore getting into the bath.
To prevent scalding.
Preparation
* The
ON/OFF
is lit.

1
Confirmation Beeper On/Off
When using RC-7508M
Operation Description
Press the ON/OFF button for about five
seconds. < Completion of setting >
* Setting is possible regardless
of whether the power switch is
ON/OFF.
The remote controller will emit a sound when any button is
pushed. This sound can be muted if it is desired.
* Initial factory setting is with sound.
CONFIRMATION BEEPER
18

OTHER SETTING OPTIONS 19
1
Other Setting Options
When using RC-7508M
Switching
scroll display
Scroll display ( P8) can be switched
on = “yes” or off = “no” .
Draining the unit This is set to drain the unit.
On this Display
2
= Initial setting < factory setting >
3
[Scroll display]
(P8)
no
yes
Scroll display is
turned on.
Scroll display is
turned off.
75°C
-
50°C
no
yes
Condition is suitable
for draining the unit.
(P19)
Stops draining
the unit.
48°C
-
40°C
(in 1°C increments)
80°C
[Draining the unit]
(P19)
[Maximum tempera-
ture setting]
(P13)
(in 5°C increments)

q Press the
ON/OFF
button to “OFF”.
w Press the
SET
button
to show the settings
screen.
Press the SET button
to select the setting to be
modified.
(Setting changes each time the
button is pressed.)
Use the buttons to
modify the setting.
(Setting changes each time the
button is pressed.)
< Completion of setting >
* When the
SET
button is
pressed, or the console is left
untouched for about 20
seconds, the settings screen
ends.
* Repeat procedures 2 - 3 again
to adjust other settings.
Operation
On this Display
Modification of the
maximum temperature
setting
The maximum temperature setting can be
modified.
Power is switched
“Off” again.
* This may not be displayed
depending on the
installation conditions.
* This is only used for
installation and
maintenance
purposes, so please
do not touch.
OTHER SETTING OPTIONS
20