Dewhot D6 User manual

Dewhot gas geyser manual
How to get the best out of your geyser

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Dewhot | Gas geyser manual
Page 2of 12 Dewhot | Gas geyser manual
Hot water output 25~ 6lt 8lt 10lt 12lt 16lt 20Lt
Rated input (KW) 12 16 20 24 32 40
Rated output (KW) 10.8 14.4 18 21.6 28.8 36.8
Gas consumption LPG 0.93 kg/hr 1.24 kg/hr 1.55 kg/hr 1.86 kg/hr 2.65 kg/hr 3.01 kg/hr
Water flow min 180 lt/hr 240 lt/hr 300 lt/hr 320 lt/hr 360 lt/hr 600 lt/hr
Water flow max 360 lt/hr 480 lt/hr 600 lt/hr 720 lt/hr 960 lt/hr 1200 lt/hr
Flue diameter 90 mm 110 mm 110 mm 110 mm 125 mm 126 mm
Dimension (W, H, D) 290*430*130 320*520*150 330*590*150 330*620*150 380*680*180 430*730*180
Packed dimension 350*565*180 385*645*200 395*720*200 395*755*200 436*845*260 485*885*260
Net weight 4.6 kg 6.5 kg 7.2 kg 8.0 kg 11.5 13.2 kg
Gross weight 6 kg 7.5 kg 8.5 kg 9.35 kg 13.5 14.5 kg
Safety devices
• Water over heating protection (75oC)
• Exhaust over heating (145)
• Flame out gas cut off
• Low flow cut off
• Non return valve
• Anti frost protection
Parameters
• Gas type, LPG
• Gas pressure 2 000-2800 pa
• Solenoid lifetime 300,000 times
• Water pressure min 0.25 bar
• Water pressure max 5.0 bar
Features
• Domestic instant water heater with
natural exhaust;
• Water gas linked automatic ignition,
• No pilot light;
• Automatic pulse ignition from two
standard torch batteries;
• Stainless steel 310 front panel;
• LCD temperature gauge;
• Flame height, gas flow switch;
• Temperature, water flow
rate switch;
• On & off nob for cold or hot water;
• Low water pressure starting;
• Water pressure stabilizing design;
• Starting indicator light;

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Dewhot | Gas geyser manual
Page 4of 12 Dewhot | Gas geyser manual
Use Require Temp 6lt 8lt 10lt 12lt 16lt 20lt
Hand Basin 4-8lt/min 35 - 45 √√xx x x
Kitchen 4-8lt/min 50 - 55 √√xx x x
Shower 5-10lt/min 35 - 42 x√√√x x
Bath 12-20lt/min 48 - 55 xxx√√x
Spa/ Jacuzzi 20lt/min 32 -36 x x xx√ √
Q/A – Why
can I not use
a 20lt to run
the whole
house
A20lt unit runs from 20lt/
min on the cool setting to
10lt/min on the hot.
If you are running 8lt/min
then the back pressure will
switch off the unit.
If you are running 10lt then
you must have it on the hot
setting or it will cut out.
Choosing the Size of Unit
Choice of Cylinder or Regulator for units
Cylinder
Regulator
Geyser size
6L, 8L 6L, 8L, 10L 6L, 8L, 10L, 12L, 16L
9KG 19KG 48KG
3KG1KG 3KG

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Dewhot | Gas geyser manual
Page 6of 12 Dewhot | Gas geyser manual
Dewhot gas geyser trouble shooting for customers
Faults are either Electical - Flat Batteries,
Physical - Flow pressure low or blocked,
Mechanical - Damaged or faulty component
Symptom Possible fault Solution
Geyser is totally dead when
the water is turned on
1. Batteries are inserted incorrectly
2. Batteries are totally flat
• Insert correctly, rear battery must be + down and front battery + up
• Replace with a brand new set of good quality batteries such as duracell
Ignitors are firing, but the
geyser is not igniting
1. Batteries are too weak to lift and hold the solenoid
2. Gas supply is low or not turned on
• Replace with a brand new set of good quality batteries such as duracell
• Turn on the gas or replace the bottle
Ignitors are firing, geyser is
coming on and going out
after a very short time
1. Water inlet may be blocked at the water junction
2. The gas regulator may be blocked, particularly if a new
bottle has just been fitted without first cracking the seal
and letting a little gas bleed off
• Remove the water inlet pipe and check the sieve is not blocked on the geyser
• Change the regulator
Water is flowing through the
geyser, the LCD is illuminating
but the geyser does not ignite
1. The micro switch is not activating enough to switch the
geyser on
2. On-Off switch may be faulty
• Turn the RH knob to the right (clockwise) to increase the pressure and activate the
geyser. This maybe experienced where you have low water pressure
• Call your installer
Geyser comes on and after a
short time the water comes
through cold
1. The geyser temperature is set too high and the addition
of any cold water will shut it off, either due to back
pressure or the temperature has risen too high and the
geyser shuts itself off
• The temperature with the hot water on only must be lowered, by turning down the
flame. Do this by turning the LH Knob to the left (anti-clockwise) until the temperature
is in the correct range. (refer to the chart on our website for the correct temperature
setting; http://www.dewhot.co.za/compare_geysers.pdf
The geyser is igniting loudly 1. The gas may be low or the gas regulator may be faulty • Check gas level in bottle if low change
• If still no change, change the regulator
The geyser is noisy
when running
1. The water is causing resonance as it flows through
the radiator
• Change the flowrate setting, RH knob either slightly to the left or right unit it disappears
My geyser is very hot in the
basin and cool for the bath
1. The setting and the use of the geyser needs to
be understood
• Please watch the video “how to control the temperature” from the website;
http://www.dewhot.co.za/dewhot-videos/

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Dewhot | Gas geyser manual
Cascading
• To run a household with its multiple requirements a solution is to cascade.
• Use an 8lt to run a kitchen, a 10lt for the shower and run both to the bath giving
18lt/min. Fit non return valves so that the kitchen and shower can only run off
their units
Installation of Gas
Mimimun distances from doors, windows, drains and electrics
Non Return Valve
Non Return Valve
8lt
8lt 18lt 10lt
10lt
May be reduced to 300 mm provided
that a non combustible roof is installed
between the containers and the window
Electrical source of
ignition, switchbox,
distibution board,
motor etc
3
1
2
1
5
1
1.5
LPG containers
Airbrick
Forced draught inlet for
airconditioner
Outdoor light

Dewhot | Gas geyser manual
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Safety instructions:
If you smell gas:
• Turn off the gas cock.
• Do not operate any electrical switches.
• Do not telephone from inside the
danger area.
• Open windows and ventilate room.
• From outside, call the gas company and
your approved installer.
Do not use or store easily combustible
materials in the vicinity of the appliance.
Installation and Operating
Instructions
Installation and servicing of the appliance
may only be carried out by a registered
gas installer.
The appliance should be regularly
maintained in order to ensure that it
remains in perfect and safe working order.
If there is a risk of freezing, the appliance
must be switched off and drained. If the
appliance has not been drained during a
cold spell then when it is switched on again
check that it produces hot water. If problems
occur, contact your installer
Function
This water heater is fitted with automatic
electronic ignition that provides for easy
commissioning. All that is required is to
switch on a hot water tap.
The appliance will then ignite automatically
as soon as a hot water tap is turned on.
The igniters fire (tick, tick, tick sound) the
gas solenoid opens (clack sound) and then
a second later the burners ignite and the
ingniters stop firing. When you switch the
water off the gas solenoid closes (faint
thud noise).
The appliance is substantially more
economical because there is no pilot flame
and only remains lit while water flows, thus
no further gas is used, in contrast with
conventional appliances which have a pilot
flame that remains alight permanently.
Air in the gas pipe when the appliance is
commissioned must be vented, this can
cause ignition failure. In such cases,
the hot water tap should be turned off and
then on again so that the appliance repeats
the ignition cycle. The procedure should be
repeated as necessary until the gas pipe is
purged of air and ignition is achieved.
1. Chimney
2. Flue sensor
3. Heat exchanger
4. Thermostat
5. Temperature Probe
6. Base plate
7. Impluse
8. Impulse bracket
9. Ignition pin
10. Ignition pin
11. Flame sensor pin
12. Burner
13. Valve left bracket
14. Valve right bracket
15. Water and Gas valve
16. Micro switch
17. Battery
18. Battert
19. Battery box bracket
20. Battery box
21. Switch off for cold
22. Battery indicator
23. LED display (Optional
models)
24. Front cover
25. Adjustment knob
26. Adjustment knob
a. Hot water outlet
b. Gas inlet
c. Cold water inlet
d. Flue pipe joint
1
2
3
4
5
6
7
8
910 11
12
13
14
15
16
17 18
19 20
21
22
22 21 23
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25
d
26
23
bc
a