Dewhot 25MJ User manual

Dewhot | Space heater manual Page 1 of 24
25MJ
GAS SPACE HEATER
This appliance cannot be used in a space smaller than
100m3 (25MJ) without ventilation

Page 2 of 24 Dewhot | Space heater manual
Read these instructions carefully before operating the
gas space heater and familiarize yourself with the ap-
pliance before connecting it to the gas cylinder. Keep
these instructions for future reference.
IF YOU SMELL GAS
1. Turn o the gas supply at the bottle
2. Extinguish all naked flames
3. Do not operate any electrical
appliances or your vehicle
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
flame burns back to the jet, immediately
turn the gas supply o at the gas cylinder.
After ensuring the flame is extinguished,
wait for I minute and then re-ignite the
appliance as per normal. Should the
appliance burn back again, close the gas
cylinder and call a registered installer.
Do not use the appliance again until the
installer has confirmed that it is safe to
do so.
GAS-PRESSURE REGULATOR
Only install a LPG or NG low pressure
regulator that complies with the
SANS 1237 requirements.
GUARANTEE
After installation, please register your
product on the Dewhot website (You
will need your invoice and Certificate of
Compliance (COC) to complete
the registration.
User
Important

Dewhot | Space heater manual Page 3 of 24
Dewhot | Space heater manual
Only a registered gas
installer can install your
gas heater and must
comply to SANS 10087-1
This appliance may only be installed by a
registered LPG/NG 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 finished their installation
make sure the installer performs an
operational and safety briefing with you.
Before you sign o the installation, make
sure you also receive your COC.
Installer
This appliance may only be installed by an
Installer registered with the South African
Qualification and Certification Committee
(SAQCC). The appliance must be installed
in accordance with the requirements of
SANS 10087-l for use with LPG or NG and
or any fire 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 and installation.

Page 4 of 24 Dewhot | Space heater manual
Technical parameters
Description Gas Space Heater
Model no DH25SH
Gas Pressure 2.8 kPa (LPG)
2.0 kPa (NG)
Max Gas Consumption 0,5 Kg/h
Maximim Room Size 225m3
Minimum Room Size 100m3
Rated Voltage 240V
Rated Frequency 50Hz
Rated Electric Power 34W
Unit Size 610 x 210 x 485mm
Unit Weight 13.3kg
Packaged Size 600 x 282 x 550mm
Packaged Weight 14.7 Kg

Dewhot | Space heater manual Page 5 of 24
Dewhot | Space heater manual
Control Panel
On/O Button
Handle
Handle
Remote Control
IR Receiver
Warm Air Outlet
Remote
Control IR
Reciever
Gas Inlet
Connector
Temperature
Sensor
Power Cord
Air Filter
Power Cord
storage
Parts diagram

Page 6 of 24 Dewhot | Space heater manual

Dewhot | Space heater manual Page 7 of 24
Dewhot | Space heater manual
No. Description No. Description Qty
1 Fan blade assembly 1 25 ODS wind shield 1
2 Air duct left bracket 1 26 Combustion chamber heat shield 1
3 Air duct right bracket 1 27 Fuse fixing bracket 2
4 Motor inner fixing bracket 1 28 Ignition pin 1
5 Fan motor 1 29 Combustion chamber guide plate 1
6 Motor anti vibration ring 2 30 Display 1
7 Motor outer fixing bracket 1 31 Infrared filter plate 1
8 Air duct back panel 1 32 Remote receiver 1
9 Air duct front panel 1 33 Control panel glass 1
10 Vent louver assembly 1 34 Top cover 1
11 Igniter 1 35 Back panel 1
12 Base 1 36 Air filter assembly 1
13 Main PCB 1 37 Remote controller capsule 1
14 Base cover 1 38 Remote controller 1
15 Main gas pipe assembly 1 39 Brass connector 1
16 ODS gas pipe 1 40 Handle slot 2
17 Nozzle 1 41 Wire rack 2
18 Burner assembly 1 42 Power cord 1
19 Combustion Chamber Cover 1 43 Room temperature sensor cover 1
20 Combustion Chamber assembly 1 44 Room temperature sensor base 1
21 Combustion Chamber right
bracket
1 45 Proportional valve assembly 1
22 Combustion Chamber left
bracket
1 46 Front panel 1
23 ODS fixing bracket 1 47 Igniter bracket 1
24 ODS (Oxygen depletion sensor) 1

Page 8 of 24 Dewhot | Space heater manual
1. Economy Button
2. O Timer Set Button
3. Current Room Temperature/Hour
Display
4. Minute Digit Display
5. Child Lock Icon
6. Boost Mode Display
7. Set Temperature Display
8. Combustion Condition Display
9. Increase Button
10. Boost Mode Button
11. Auto Mode Button
12. On Timer Setting Button
13. Child Lock Function
14. Room Temperature Icon
15. ECO Display icon
16. ON Timer Icon
17. OFF Timer Icon
18. Set Temperature Icon
19. AUTO Mode Icon
20. Decrease Button
21. ON/OFF Button
Control panel functions
1 2 3 4 5 6 7 8 9 10
11 12 14 15
13 16 17 18 19 20 21

Dewhot | Space heater manual Page 9 of 24
Dewhot | Space heater manual
Battery Compartment
LCD Display
Timer Function
ON/OFF
ON/OFF
button
Operating
mode
Increase/ Decrease
Child Lock
Remote control functions

Page 10 of 24 Dewhot | Space heater manual
ECO MODE
The heater cuts o when the room
temperature reaches the set temperature.
The heater turns back on in a low output
mode when the room temperature
drops 2°C.
BOOST MODE
The heater cuts o when the room
temperature reaches the set temperature.
The heater turns back on in full output
mode when the room temperature
drops 1°C.
AUTO MODE
The heater starts up with maximum heat
output and then switches to eco mode
once the set temperature is reached to
maintain room temperature.
REMOTE CONTROLLED
Simplicity of adjusting the temperature,
timer and turning the applinace on and o
by using the remote.
THERMOSTATICALLY
CONTROLLED
The appliance will automatically turn itself
on and o when the room temperature
reaches the set temperature. This can be
adjusted from 16°C to 30°C in
1°C incremenets.
CHILD LOCK
Prevent children or unwanted adjustments
by activating child lock and locking the
adjustment functions.
AUTOMATIC IGNITION
The heater automatically ignites itself
once the ON button has been pushed.
FAN ASSISTED COMBUSTION
The motor and fan force oxygen
into the appliance to fuel the heater
more eeciently, decreasing gas
consumption and maximizing
complete combustion.
TIMER FUNCTION
Use the timer function to set the
countdown timer to automatically turn
your heater on or o in a specified amount
of time.
MULITPLE SAFETY FEATURES
The heater is equipped with over heat
temperature protection, oxygen depletion
sensor, flame detection device and a
tilt switch.
Functions & features

Dewhot | Space heater manual Page 11 of 24
Dewhot | Space heater manual
Safety instructions- read before use
Do not attempt to install this appliance
yourself.
Do not attempt to service or modify this
appliance yourself.
Do not use this applinace in a marine
enviroment, such as on yacths or boats etc.
Do not store flammible substances or
chemicals near this appliance.
Do not spray aerosoles near this appliance,
whether its on or o.
Do not use this appliance outdoors or
where you can see damage to any part of
the appliance.
Do not cover the heater with towels or
clothing etc.
Do not block or cover any of the inlet or
outlet vents, see installation instructions.
Do not forcefully disconnect the gas or
electronics.
Do not use the appliance near water and do
not operate the appliance with wet hands
or feet.
Do not use in a bathroom or bedroom.
Do not operate in a room smaller than what
is specified, see installation instructions.
Do not operate without the correct
ventilation requirements, see installation
instructions.
Do not operate from a gas cylinder installed
indoors.
Do not unplug the appliance after use until
the fan has stopped running, approximately
3 minutes.
Do not move the heater while it is in use or
while the fan is running after use.
Do not continue to use the heater if you
smell gas or strong odurs.
Do not continue to use the heater if you feel
symptoms such as lightheaded, headache,
dizzy, weak, confused, shortness of breath.
Do not use the heater if you feel something
may be wrong or suspect it is not
functioning correctly.
DO NOT

Page 12 of 24
Safety instructions
NATURAL AND LP GAS
Both LP and natural gas are odoured to
help detect leaks.
Appliances using LP gas are dierent
from natural gas models. A natural gas
appliance can not function safely on LP gas
and vice versa.
Do not try to convert a gas appliance from
a natural gas to a LP gas appliance.
This could damage the appliance and
cause injuries or fires. Never connect the
gas appliance 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 using the heater check for gas
leaks. Use a soapy solution to check all gas
fittings and connections. Bubbles indicate
a leak.
1. Do not attempt to find 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, DO NOT start your
vehicle.
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 fixed 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 appliance has been subjected to
overheating, fire, flood, physical damage
or if the gas supply fails to shut o.
WARNING
Never use an open flame to test for gas
leaks as this could result in property
damage, personal injury and
or death.

Dewhot | Space heater manual Page 13 of 24
Installation instructions
1. Make sure your heater is connected to
the correct gas type before use.
2. Ensure the heater is plugged into a
reliable electrical source matching the
power requirments of the heater and in
compliance with local electrical laws.
3. Ensure your heater has been installed by
a qualified professional.
4. Ensure the heater has not been installed
in an existing fireplace.
IMPORTANT
The heater should not be installed near
flammible materials. It should be at least
1.5 meters away from curtains or other
potential hazards. Keeping in mind wind
may blow curtains towards the heater.
The heater should be at least 15cm clear
of side walls and should not be operated
where there is a draft from wind.
VENTILATION
REQUIREMENTS
Irrespective of room size, due
consideration should be given to the
fact that gas appliances use oxygen from
the surrounding air to fuel the flame and
this oxygen needs to be replenished
through ventilation. You should never
use any gas appliance in a sealed room.
Always consider using ventilation where
permanent ventilation has not been
installed.
25MJ Heaters should not be used in rooms
smaller than 100 meters cubed without
ventilation. This room size is approximately
6.5 x 6.5 x 2.4m
If the room size is not larger than 100m3
you will require permanent ventilation.
Two vents of 163cm2 should be installed
if the room is smaller than the specified
size, one vent at high level one vent at low
level.
15MJ Heaters should not be used in rooms
smaller than 60 meters cubed without
ventilation. This room size is approximately
5 x 5 x 2.4m
If the room size is not larger than 60m3
you will require permanent ventilation.
Two vents of 163cm2 should be installed
if the room is smaller than the specified
size, one vent at high level one vent at low
level.
A window is not considered permanent
ventilation.

•
Page 14 of 24 Dewhot | Space heater manual
Installation instructions
GAS HEATER LOCATION
The heater is intended to installed as a
freestanding, portable unit. Its portability
is restricted by the number of gas outlet
points installed.
It should not be installed within 1.5m of
any potential flammable hazards.
It should installed at a minumum of 15cm
from side walls.
The heater and the gas cylinder should
be installed according to local and
national gas and electrical regulations.
You should always receive a Certificate
of Compliance (CoC) for your installation
GAS SUPPLY
Ensure the gas type matches
specification table.
Ensure there is sucient gas pressure
(2.8kpa) and pipe size.
Ensure the gas line is equipped with a
shut o valve.
A soapy solution must be used to check
all connections and fittings for gas leaks.
The CoC issued should be signed.
ELECTRICAL CONNECTION
POWER CORD
Electrical connections and wiring
must comply with local and national
standards.
220 V/50HZ is the electric power supply
requirement.
We recommend installing an electrical
leakage breaker.
Keep the excess power supply cord on
the outside of the gas heater.
WARNING
Before servicing the gas heater, turn o
the electrical power at the plug or circuit
breaker. Failure to do so could result in
electrocution.
Label all wires prior to disconnecting
them when servicing controls. Wiring
errors can cause malfunctions.

Dewhot | Space heater manual Page 15 of 24
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Dewhot | Space heater manual
TURNING ON THE HEATER
Once the gas and power have been
connected the heater will go into
standby mode, use the ON/OFF button
to turn on the heater.
Use the ON/OFF button again to turn o
the heater after use. Do not unplug the
heater until the fan has stopped.
DEFAULT/AUTO MODE
When turning on the heater it will enter
the default auto mode where the preset
temperature is 20°C.
SET THE TEMPERATURE
Use the up or down button to adjust
the temperature from 16°C to 30°C in 1°C
increments.
AUTO MODE
In auto mode the heater will put out its
maximum amount of heat and then turn
to Eco mode once the room temperature
reaches the pre set temperature.
BOOST MODE
In Boost mode the heater uses its
maximum heat output to reach the set
temperature, once there the heater
will turn o and only turn back on
to maximum heat when the room
temperature drops by 1°C.
ECO MODE
In Eco mode the heater will operate with
a reduced heat output and turn o once
the room temperature reaches the set
temperature. The heater will only re-start
on its reduced heat output when the
room temperature drops by 2°C.
CHILD LOCK
To enter child lock mode, press the
ON timer and OFF timer buttons at the
same time for more than 3 seconds. You
will see the child lock indicator light up
on the display. Except for the ON/OFF
button, all the other buttons will no
longer function.
When the ON/OFF is pressed under the
lock function, the heater turns o and
will display :00, all other buttons will still
not function.
To exit the child lock function, press the
ON timer and OFF timer buttons at the
same time for more than 3 seconds. The
child lock icon will disappear and the all
the other buttons will function normally
again.
Operation instructions

Page 16 of 24 Dewhot | Space heater manual
Operation instructions
AUTO TURN ON TIMER
FUNCTION
With the heater in Standby mode
(turned o), press the timer on button
and the timer on indication icon will light
up. The timer indicator will show 00:00
and the hour indicator will flash.
Use the up and down buttons to set the
hour by 1 hour increments from 0-23hrs.
Press the on timer button again to
confirm the hour setting and the minute
indicator will start flashing.
Use the up down button to adjust the
minutes in increments of 5 minutes from
0-55 minutes.
Press the on timer button again to set
the clock and wait a few seconds. Once
it is set, it will begin to count down and
the heater will turn on when the timer
reaches 00:00.
To cancel the timer function press and
hold the timer on button for more than
5 seconds, the display clock will return
to 00:00.
AUTO TURN OFF TIMER
FUNCTION
With the heater turned on, press the
timer o button and the timer o
indication icon will light up. The timer
indicator will show 00:00 and the hour
indicator will flash.
Use the up and down buttons to set the
hour by 1 hour increments from 0-23hrs.
Press the on timer button again to
confirm the hour setting and the minute
indicator will start flashing.
Use the up down button to adjust the
minutes in increments of 5 minutes from
0-55 minutes.
Press the o timer button again to set
the clock and wait a few seconds. Once
it is set, it will begin to count down and
the heater will turn o when the timer
reaches 00:00.
To cancel the timer function press and
hold the timer o button for more than
5 seconds, the display clock will return
to 00:00.
PLEASE NOTE THIS APPLIANCE
IS NOT INTENDED TO BE USED
BY CHILDREN OR PEOPLE WITH
REDUCED PHYSICAL, SENSORY
OR MENTAL CAPABILITIES
OR LACK OF EXPERIENCE
OR KNOWLEDGE OF THE
APPLIANCE.

Dewhot | Space heater manual Page 17 of 24
Dewhot | Space heater manual
Do not operate the appliance with the
panels or covers removed. Always unplug
the heater before cleaning or servicing it.
Regular visual inspections should be
done by the owner, this visual inspection
should consist of looking for any physical
damage to the cover, damage to the
electrical cable, damage to the display
screen or any other part of the heater, as
well as a gas leak test which can be done
with a spray bottle and soapy water on
the gas piping and connections to the
heater.
If you notice any black soet occuring
around the hot air outlet, discontinue use
immediatley and log a service call.
When the heater is cooling down after
use or heating up during use, occasional
clicking sounds may be heard, this is
normal. However, continuous metallic
noises, grinding sounds, the smell of gas
or any of the symptoms listed on the fault
chart should be investigated immediatley
and the heater should not be used.
If you suspect something to be wrong
with the heater, do not use it and call
your local installer or supplier to have the
unit inspected and serviced.
Service calls, general maintenance and
certain repair work should always be
carried out by a qualified professional and
may not be covered under warranty.
Faults caused by external factors, such
as but not limited to, will not be covered
under warranty: dirty gas, too much or
too little gas pressure, operation errors,
water damage, physical damage or any
other external factor that did not fail as a
result of mal-manufactoring.
The heater should be inspected by a
qualified professional every year. This
inspection should consist of gas pressure
tests, to ensure normal function of the
regulator, a visual flame inspection to
ensure there is complete combustion
with the flame.
A bright yellow flame is considerded
very dangerous and the cause for lack
of air supply to the burners should be
investigated and rectified immediately.
A flame lifting o the burner indicates
incomplete combustion and the cause for
too much oxygen to the burners should
be investigated and rectified immediately.
The installer should during this annual
inspection, check that any permanent
ventilation openings have not been
closed o.
Maintenance

Page 18 of 24 Dewhot | Space heater manual

Dewhot | Space heater manual Page 19 of 24
Dewhot | Space heater manual
GENERAL
• Turn the appliance o and disconnect
the power supply before cleaning.
• Clean the appliance and remote with
a damp soft cloth only. Gently wipe
the surfaces of the appliance and any
remaining moisture with a dry
soft cloth.
• The air filter of the appliance should
be cleaned at least monthly or
more depending on how much dust
accumulates on the filter during the cold
season.
• Do not store household items near or on
top of the appliance.
• Filters should be cleaned on a
monthly basis.
• Do not scrub the appliance with
a brush.
• Use only water, any chemicals can
damage the surface of the appliance.
• Do not remove any labels, including the
rating table when cleaning or servicing.
• Do not splash water on the remote
controls when cleaning.
CLEANING THE AIR FILTER
• Turn the appliance o and disconnect
the power supply.
• Unscrew the air filter and slide the
filter out.
• Do not tap the filter as it may damage it.
Use a vaccum to clean the filter.
• Put the filter back in the same way you
removed it
If you don’t perform regular maintenance
the heater can start operating poorly
which can cause carbon monoxide
poisoning or other potentially hazardous
conditions
VACATION AND EXTENDED
SHUT-DOWN
If the heater is left for an extended
period of time, the power and gas to the
appliance should be turned o.
geyser needs to be serviced and checked.
Cleaning

Page 20 of 24 Dewhot | Space heater manual
Fault No display Ignition
failure
Flame
failure
Gas
smell
Room not
heating
Remote
controller not
working
Weak
airflow Solution
Not plugged in or
turned o XPlug the cord in and
turn power on
Main power failure X X Re-ignition when
power is on
Gas pressure X X Turn on gas/check
pressure
Air lock XRepeat ignition
Room too large XCheck page 5
louvre blocked X X Remove obstruction
Blocked filter X X Clean the filter
Air filter blocked X X X Remove obstruction
Gas Leak X X X Isloate gas supply,
call service
Child lock set X X Cancel lock function
Flat remote battery XReplace batteries
Wrong gas type X X Check and use the
correct gas type
Troubleshooting