Dewhot LPDH 5 User manual

5L Flueless
Low Pressure

Page 2 of 12 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
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 conrmed that it is safe to do
so.
Gas-pressure regulator
This appliance requires an operating
pressure of 2,8 kpa. Only install a LPG
regulator that complies with the SANS 1237
requirements.
Guarantee
Should you to want to make a guarantee
claim, you will need to supply your invoice
and Certicate of Compliance (COC)
Important

Page 3 of 12
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 brieng.
Before you sign o the installation, make
sure you also receive your certicate of
compliance (COC).
Installer
This appliance may only be installed by
a LPG Installer registered with the South
African Qualication and Certication
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
unit.

Page 4 of 12 Dewhot | Gas geyser manual
Water-controlled automatic
ignition
This unit has a water ow sensor that
will immediately ignite the burner when
detecting water ow
Auto cut o protection
The temperature sensor will automatically
cut o the gas ow and cut o the unit if
the temperature is exceeded
Low water pressure start up
The unit will activate from a water supply
pressure of 0,015MPA. This indicates
that it is suitable for low water pressure
applications
Anti-freeze protection
The unit will automatically release a small
amount of water to stop it from freezing
Dry combustion protection
In the event of dry combustion, the unit
will automatically shut down
Over pressurisation protection
The unit will automatically protect itself
by releasing pressure if the water supply is
over 1.0 MPA
Flame out sensor
This is designed to automatically cut o
the gas supply should the ame/ burner
unexpectedly extinguish
Functions & Features

Page 5 of 12
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Parts Diagram
Oxygen
Depletion
Sensor ( ODS )
Flame Out
Sensor
Control
Dial
Gas Valve
Battery Box
Gas Inlet
Heat
Exchanger
Burner
Water Flow
Sensor
Thermostat
Ignition
Controller
Water Inlet
Valve
Pressure
Release
Valve

Page 6 of 12 Dewhot | Gas geyser manual
Description Gas gas geyser
Model no LPDH 5
Model Type A
Gas type LPG
Max gas pressure 2800pa
Hot water output 5L/min
Water pressure 0.01 - 1.0 MPA
Max gas consumption 0.8 kg/h
Unit size 435 X 290 X 165 mm
Required ventilation 262cm2( 1 at both high and low level)
G.W 6kg N.W 4.7 kg
Technical parameters
Installations
Safety Warning
1. The gas geyser must be installed in a
well-ventilated place. While Operating
the gas geyser consumes a lot of
oxygen, so air inlet vents are required to
match specication in table above. Air
circulation will cause lack of oxygen and
carbon monoxide poisoning which can
be fatal.
2. Don’t expose the gas geyser to strong
wind or rain, - if it is installed outside,
please use a cover.
3. The misuse of LPG gas equipment can
lead to serious injuries and can be fatal.
Use a registered installer to t your gas
geyser
4. Don’t use old or faulty LPG gas
equipment.

Page 7 of 12
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Installation instructions
Mounting the Gas Geyser body
Drill 4 x 8mm holes into the wall matching
the holes on the back of the gas geyser.
Use 6mm expansion bolts.
Hang the gas geyser, and then attach it
with the expansion bolt to the hole of
lower bracket.
Cold Water Supply Pipe
The cold water inlet joint is a standard half
inch (15mm) male plumbing tting.
The water inlet pipe should be connected
using a rigid water pipe.
The inner diameter of the inlet pipe
(including the valve) shouldn’t be less than
8mm.
Check that the inlet sieve is secure before
installing the cold water pipe. This sieve
ensures that any particles in the new pipe
do not enter the gas geyser.
Hot Water Supply Pipe
The hot water outlet joint is a standard half
inch (15mm) male plumbing tting
The hot water outlet pipe should be
connected using a rigid water pipe.
The inner diameter of the hot water outlet
pipe (including the valve) shouldn’t be less
than 8mm.
After installation
Open the cold water valve to the
maximum to test the water ow and check
whether there are any leaks.
Gas Supply Pipe
The gas inlet joint is a standard half inch
(15mm) male plumbing ttings..
The gas line should be connected using
an approved method of piping and tting
according SANS 10087-1
After the gas inlet joint is connected, open
the gas supply valve, and check whether
there is a gas leak at the joint by using
soapy water or a gas manometer.
The gas geyser should be used with a low
pressure regulator of 2,8 KPA.

Page 8 of 12 Dewhot | Gas geyser manual
1. Open the battery box and insert two ‘D’
Cell sized batteries
2. Open both the cold and hot water
valve. Close the water Inlet valve after
you make sure the cold water is owing
out through the water outlet and the
ignition pins re up.
3. Open the gas supply
4. Open the water inlet valve and
the geyser will ignite immediately.
Sometimes because there is air in the
gas pipe, it may not ignite the rst time,
so, try two or three times.
5. By closing the water inlet or outlet
valve the gas heater will stop working.
If needed again, just re-open the water
inlet valve or water outlet valve. Please
note that the temperature of hot water
owing out is higher so wait for the
temperature to stabilise.
6. This gas geyser may only be used for
short delivery periods and may not be
used for the purpose of supplying hot
water to a bath or washing machine.
7. This gas geyser may only be installed
in a room if the room meets the
appropriate ventilation requirements
(refer to SANS 10087-1)
8. This gas geyser shall not be
connected to a ue.
Operating instructions

Page 9 of 12
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Operating warnings
• Don’t use the gas geyser in a sealed
room or room with no air circulation.
• During operation, if you nd there
is a gas leak, turn o the gas valve
immediately. If the room is full of gas,
you must turn o the power switch.
To avoid an explosion do not use
the gas geyser and call your installer
immediately to determine the fault.
• When leaving the premises for
extended periods, turn o your gas
supply.
• The body of the gas geyser can get very
hot, so please don’t touch any part of
the gas geyser, except for the switches
• Do not put any foreign objects in the
exhaust port, air inlet or on top of
the gas geyser to avoid incomplete
combustion which results in posioning.
• Should you notice a yellow ame which
indicates abnormal combustion you
should close the gas valve right away
and then contact the installer.
• Before outdoor temperatures reach
below zero degrees make sure the
remaining water is emptied out of the
gas geyser to avoid it freezing.

Page 10 of 12 Dewhot | Gas geyser manual
Troubleshooting
Symptom Solution
The water ow of the geyser
has decreased
Check for debris in the inlet sieve and in the
outlet ttings (shower rose / kitchen spout
sieve)
The geyser is dead or the ignitors
are ring weakly / slowly Replace the batteries
Water leaking from the geyser Call a Dewhot Technician
The gas geyser wont switch on
Check the contact terminals in the battery
box for rust. Tip - Drill two 3-4 mm drain
holes in the battery box lid to stop any
moisture build up in the future.
The geyser has new batteries
and the water is owing through
the geyser but does not ignite
properly
Disconnect the inlet (cold) & outlet (Hot)
water connection, check for debris in the
sieve and blow through the geyser to see if
it will ignite. If not, replace the water ow
sensor.
The unit ignites
but with a loud bang
Check the ignitors are ring correctly from
the end of the pins, they will normally be
corroded / carboned up and will need
cleaning or replacing.
Check that the ignitor wires and ame out
sensor are not brittle or shorting out. make
sure they are cleaned o.

Page 11 of 12
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Symptom Solution
The geyser ignites but dies
after 8-10 seconds
1. Replace the ame out sensor
2. The temperature sensors, or
temperature sensor wires are broken and
need replacing.
3. If the above has been done then the
solenoids can be faulty , replace one at
a time
The unit res over again for its
10 second cycle however the
geyser does not ignite and you
cannot hear the “CLACK” of the
solenoids.
Disconnect the gas at the geyser and run
the water through it, if you then hear
the solenoid ring and you have already
changed the batteries then change the
regulator.
www.gasgeysers.co.za/support/troubleshooting
for comprehensive troubleshooting, please visit our website

Page 12 of 12
Dewhot | Gas geyser manual
1. Check the gas supply pipe regularly
to ensure that there are no cracks
or leaks.
2. Regularly clean the surface of the
gas geyser body to remove dirt or
dust using a neutral detergent.
3. Do not use a a strong detergent, like
benzene or gasoline to clean the
plastic parts and printed surfaces of
the gas geyser.
4. Regularly remove and wash the
stainless steel sieve in the cold
water inlet
Maintenance
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