Dewhot OD20DH Manual de usuario
20L Outdoor Fan Forced
Gas Geyser
Page 2 of 24 Dewhot | Gas geyser manual
Read these instructions carefully before operating the
gas geyser and familiarize yourself with the appliance
before connecting it to the gas cylinder. Keep these
instructions for future reference.
This appliance is manufactured to operate on LPG
only. Do not tamper or modify the appliance.
IF YOU SMELL GAS
1. Turn o the gas supply at the bottle
2. Extinguish all naked ames
3. Do not operate any electrical
appliances
4. Ventilate the area
5. Check for leaks as described in
this manual
6. If gas smell persists, contact your
dealer or gas supplier immediately
7. Do not modify the appliance
BURN-BACK
In the event of a burn-back, where the
ame burns back to the jet, immediately
turn the gas supply o at the gas cylinder.
After ensuring the ame is extinguished,
wait for I minute and then reignite the
appliance as per normal. Should the
appliance burn back again, close the gas
cylinder and call a registered LPG installer.
Do not use the appliance again until the
installer has conrmed that it is safe to
do so.
GAS-PRESSURE REGULATOR
This appliance requires an operating
pressure of 2,8 kpa. Only install a LPG low
pressure regulator that complies with the
SANS 1237 requirements.
GUARANTEE
After installation, please register your
product on the Dewhot website (www.
gasgeysers.co.za/product-registration)
You will need your invoice and Certicate
of Compliance (COC) to complete
the registration.
Important
Page 3 of 24
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Only a registered gas
installer can install your
gas geyser and must
comply to SANS 10087-1
User
This appliance may only be installed by a
registered LPG installer.
Registered installers are issued with a card
that displays their registration number.
Insist on seeing this card and make a note
of their registration number.
When they have nished their installation
make sure the installer performs an
operational and safety brieng.
Before you sign o the installation, make
sure you also receive your COC
Installer
This appliance may only be installed by
a LPG Installer registered with the South
African Qualication and Certication
Committee (SAQCC). The appliance
must be installed in accordance with
the requirements of SANS 10087-l for
use with LPG and or any re department
regulations and/or local bylaws applicable
to the area.
If in doubt, check with the relevant
authority before continuing with the
installation. Once an installation is
complete you are required to brief, in full,
the operational and safety functions of
the appliance.
Page 4 of 24 Dewhot | Gas geyser manual
Description Outdoor Room Sealed
Model no OD20DH
Model Type D
Gas type LPG
Max gas pressure 2,8kpa
Hot water output 2.5-20L/min
Water pressure 0.25 - 5 BAR
Rated input 40kw
Water Flow 2,5 - 20L/min
Rated voltage 240V/60Hz
Rated Electrical Power 45W
IP Rate IPx4D
Max gas consumption 2.9 kg/h
Appliance size 575 x 365 x 150 mm
Unit weight 17.2 kg
Technical parameters
Temperature
Controler
Page 5 of 24
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Lock ring
Water outlet
connector
Control unit support
Combustion valve
Water inlet connector
Water ow sensor
Transformer
Sensor pin
clamp
Chimney
gasket
Chimney
Temperature
Controler
Heat
exchager
Burner
Fan
Control
unit
Bottom
Panel
Power
cord
Bottom
support
Dispatcher
Front Panel
Sensor pin
Gas inlet connector
Parts Diagram
Page 6 of 24 Dewhot | Gas geyser manual
WATER FLOW SENSOR
This appliance has a water ow sensor that
will immediately ignite the burner when
detecting water ow.
FAN ASSISTED COMBUSTION
The motor and fan force oxygen into
the appliance to fuel the ame,
maximising eciency.
LOW WATER PRESSURE
START UP
The appliance will activate from a
water flow of 3lt/min. This indicates
that it is suitable for low water
pressure applications.
AUTOMATIC GAS ADJUSTMENT
The appliance will automatically adjust its
gas usage depending on the water usage,
using less gas when you use less water,
making the appliance more ecient.
DRY COMBUSTION PROTECTION
In the event of dry combustion (when the
gas burner comes on with out water ow),
the appliance will automatically shut down
OVER PRESSURISATION
PROTECTION
The appliance will automatically protect
itself by releasing pressure if the water
supply is over 10 Bar (this can be manually
set).
FLAME OUT SENSOR
This is designed to automatically cut o
the gas supply should the ame/ burner
unexpectedly extinguish or the sensor no
longer detects a ame.
REMOTE DIGITAL CONTROL
PANEL
Simplicity of adjusting the temperature of
the water by 1°C increments at the touch
of a button.
LONGER LASTING
Due to the seal around the entire cover of
the geyser it gets far less exposed to harsh
elements such as wind, rain and sea air. It is
better protected and thus longer lasting.
THERMAL FUSE
The thermal fuse wraps around the
heat exchanger and heats up in subzero
temperatures preventing the water from
freezing inside the pipes, causing them
to burst.
Functions & Features
Page 7 of 24
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Safety instructions
FLAMMABLE MATERIALS
Flammable materials and liquids
(adhesives, solvents, paint thinners etc.)
are extremely dangerous.
DO NOT handle, use or store these
combustible materials near to the
gas geyser.
WATER TEMPERATURE
SETTING
Safety and energy savings need to be
considered when setting the water
temperature . Water temperatures above
52°C can cause severe burns.
Refer to page 16.
1. Households with small children, disabled
or elderly people need to set the
temperature to 49°C or lower
2. Maximum water temperature occurs
when the burner is on. To see the water
temperature look at the front control
panel of the gas geyser.
3. The Factory default water setting is 41°C
and this setting can be adjusted on the
control panel
4. The gas geyser has a heating range
between 35°C and 60°C.
TIME/TEMPERATURE EXPOSURE RESULTING IN BURNS
Hot water can create severe burns, we should rarely exceed the temperatures below
49°C More than 5 minutes
52°C 1.5 to 2 minutes
55°C +/- 30 seconds
57°C +/- 10 seconds
60°C less than 5 seconds
63°C less than 3 seconds
66°C +/- 1.5 to 2 seconds
69°C +/- 1 second
Page 8 of 24 Dewhot | Gas geyser manual
Safety instructions
NATURAL AND LP GAS
Both LP and natural gas are odoured to
help detect leaks.
Appliances using LP gas are dierent from
natural gas models. A natural gas gas
geyser can not function safely on LP gas
and vice versa.
Do not try to convert the gas geyser from
a natural gas to a LP gas appliance.
This could damage the appliance, cause
injuries or res. Never connect the
gas geyser to a fuel type that is not in
accordance with the appliance’s data table.
WHEN DETECTING A LEAK ON
YOUR INSTALLATION
LP gas is twice as heavy as air and may
accumulate in low lying areas and cavities.
Before opening the hot water tap to test
your gas geyser, check for gas leaks. Use a
soapy solution to check all gas ttings and
connections. Bubbles indicate a leak.
1. Do not attempt to nd the cause
yourself and turn o the gas supply.
2. Do not ignite any appliance.
3. Do not touch any electrical switch.
4. Evacuate the house immediately with
your family and pets.
5. Leave the doors open for ventilation and
contact the gas supplier, registered LP
Gas Installer or Fire Department.
6. Stay away from the house (or building)
until the service call has been made,
the leak is xed and the space has been
declared as safe.
7. Ask the installer to show you where the
gas shut-o valve is and how to use it.
8. Turn o the manual shut-o valve if
the gas geyser has been subjected to
overheating, re, ood, physical damage
or if the gas supply fails to shut o.
Gas detectors are highly recommended
and they must be installed in accordance
to the detector manufacturer’s regulations.
Page 9 of 24
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Installation instructions
LOCATION
1. Long hot water pipes should be
insulated for water and
energy eciency.
2. The gas geyser and water pipes should
be protected from
freezing temperatures.
3. When installing a gas geyser a minimum
of 1 meter is required from any
venting system.
IMPORTANT
Do not solder the HOT or COLD water
connections. If solder connections are
used, solder the tting to the adapter
before tting the adapter to the water
connections. Any heat applied to the
water supply ttings will permanently
damage the internal components of the
gas geyser.
MOUNTING THE GAS GEYSER
Install the appliance in a place that allows
for easy access.
At least 8mm concrete plugs and screws
should be used to mount the gas geyser to
the wall. In the case of dry walling use dry
wall anchors.
The gas geyser requires a 13 amp plug
point
WATER SUPPLY
This appliance must only be used with
the following water supply requirements:
1. Clean, potable water free of corrosive
chemicals, sand, dirt, or other
contaminants.
2. With inlet water temperatures above
0°C, but not exceeding 49°C
3. Free of lime and scale deposits
DO NOT reverse the hot and cold water
connections, this will not allow the gas
geyser to function.
•
Page 10 of 24 Dewhot | Gas geyser manual
Safety instructions
WATER SUPPLY
CONNECTIONS
Plumbing should be carried out by
a qualied plumber. Use approved
plumbing materials only. The diameter
of the pipe lines should be a minimum
of 1/2”.
To conserve energy and to prevent
freezing, insulate both the cold and the
hot water supply lines. DO NOT cover the
drain valves.
WATER PRESSURE GUIDELINES
Operation of the gas geyser requires a
minimum water pressure of 14 psi (0,5
Bar) and a minimum water ow rate of
2.5 Litres/min.
1. For long pipe runs water pressure can
drops and additional water pressure
may be required.
2. When the water is supplied from a
water tank, the height of the tank,
the diameter of the pipes and their
relation to water pressure, should be
taken into consideration.
3. 5 meters above the shower head is
a minimum requirement if this is not
possible then gravity fed water is
not recommended
WATER SUPPLY
1. Sucient water pressure and ow rate
2. Make sure there are no water leaks
and that the water lter is clean.
3. Only compliant or specied materials
must be used
IMPORTANT
If the water ow is too slow, the gas
geyser will not ignite. Keep the shower
head clean from debris that reduces
ow rate.
To keep the water pressure balanced add
a 400-600kpa pressure regulating valve
on the cold water supply. Install a shuto
valve near the inlet of the gas geyser for
service and draining purposes.
Be sure to connect the water inlet and
the hot water outlet as shown on the
gas geyser. If reversed, the gas geyser
will not function.
Installation of unions or exible copper
connections are recommended on the
hot and cold water lines, so that the gas
geyser may easily be disconnected for
servicing.
Install a non-return between the gas
geyser and the water shuto valve.
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