MTS Systems 5L CF User manual

TECHNOLOGY MANUAL
INSTANTANEOUS GAS WATER HEATER
MODEL: 5L/6L CF
EDITION: 01 / MAY, 2007
ISSUED BY MTS (CHINA)

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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INDEX
Characteristic & Function…………………………………………………………………..2 - - 4
¾Outlook & summary………………………………………………………………………….2
¾General technology data………………………………………………………………………3
¾Function……………………………………………………………………………………….4
Structure & Components……………………………………………………………………5 - - 8
¾Structure & Main components list…………………………………………………………….5
¾Gas & water valve…………………………………………………………………………….6
¾Work and control program……………………………………………………………………7
¾Electric circuit…………………………………………………………………………………8
Installation…………………………………………………………………………………9 - - 15
¾Product dimension....................................................................................................................9
¾Installation place requirement.................................................................................................10
¾Fixation of heater……………………………………………………………………………13
¾Water pipe and gas pipe……………………………………………………………………..14
¾Exhausting pipe……………………………………………………………………………..15
Use instruction……………………………………………………………………………………16
General Safety instruction……………………………………………………………..….17 - - 18
General failure & Solution……………………………………………………………..…19 - - 23

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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OUTLOOK & SUMMARY
Exhaustfluepipe
Digitaltemperaturedisplay
Flamewindow
Water adjust knob, control heating water volume
Winter/Summer switch knob; control half or whole burner working
Batterypowerlight
Gas adjust knob, control gas combustion input power
Batterypowerswitch
Batterybox,2pcsA1inside
Coldwaterinletwithfilter,G1/2”
Waterpressurereleasesvalve,workingpressure:0.8Mpa
Hotwaterinlet,G1/2”
Gas inlet, G1/2”

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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GENERALTECHNOLOGY DATA
FUN
CTIO
NS
Model 5L CF 6L CF
Hot water output(L/Min) 5 6
Heat input(KW) 10 12
Heat efficiency >80%
Gas type Liquefied Petroleum Gas(LPG) / Natural gas (NG)
Gas pressure (Kpa) 2.8---LPG / 2.0---NG
Gas consume ( M3/h) 0.367-PG / 1.029- NG 0.424-LPG / 1.241-NG
Min.water start pressure (Mpa) <0.025
Water working pressure (Mpa) 0.025-0.1
Installation place Indoor
Exhaust type Natural flue
Ignition Electrical
burning Natural atmosphere burning
Heat exchanger Normal copper
Safety protection Electronic flame sensor
Water temperature control Mechanical
Display Light/LED
Rated voltage DC3V
Water inlet / outlet G1/2
Gas inlet G1/2
Exhaust outlet Φ90mm
Net weight(Kg) 5.0 5.2
Dimension (mm) 440×300×130
Colour White (paint)

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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FUNCTION
1. Convenient
This water heater needs two A1 batteries to feed micro-computer(IC) power. You only need to
turn on the power button, open the gas valve, cold water valve and hot water valve; warm water
will be supplied continuously after several seconds. Whichever you turn off cold water valve, hot
water valve or the power button the water heater will stop working.
2. Gas saving
Advanced combustion system is used in the heater; the subsection switch device is designed for
winter & summer type.
3. Dry burning proof protection
It immediately closes the gas valve when there is no water flow.
4. 20 minutes timing protection
After working for 20±3min, the heater will stop for self protection automatically. When user wants
to go on using the heater, restarting it is enough.
5. Over-pressure protection
When water pressure is too high, it will unload automatically to avoid heater damage.
6、Hot water temperature display light(display light model)
While working the display light can shine.
7、Hot water temperature display (LED model)
While working the LED display window can show the hot water temperature.

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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TRUCTURE & MAIN COMPONENTS
Flue connector
(￠127mm )
Flue exhaust holder
Hang holds
Temp. limit sensor
(6L)
Ignition sensor
Flame sensor
Ignition control(IC)
Solenoid valve Battery box
Microswitch
Water valve
Gas valve
W/S gas valve
Burner
Heating
exchanger (H.E)
Gas inlet (G 1/2”) Water outlet (G 1/2”) Water inlet (G 1/2”)

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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GAS & WATER VALVE
PART DESCRIPTION PART DESCRIPTION
01 Gas adjust valve
18
Water tap
02 O ring 14.3*9*2.65
19
O ring
03 Mechanical gas valve ring base
20
Steady spring
04 Mechanical gas valve ring
21
Steady spring fixed support
05 Mechanical gas valve ring
22
Steady spring support
06 Ring base for driving
axis
23
Regulative screw for Max. water flow
07 Driving
axis
24
Safety valve
08 airproof
25
O ring
09 O ring
26
Water valve support
10 Rectangle airproof
27
Water valve
11 Spring support
28
Regulative screw for Min. water flow
12 Spring(small)
29
Anchor point for septum
13 5L Spring(small) support
30
Filter
14 O ring
31
Microswitch
15 Septum
32
Solenoid valve
16
Septum support
33
Gas valve
17
O ring

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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WORK AND CONTROL PROGRAM
Install battery
Open water
Sparking
Open gas valve
Stop ignition
Working
Safety device
Check failure
Close water Close water
Close gas valve
Close gas valve
Flame failure 20m timing
Temp. limit
Flame sensing
N
O
YES
NO
YES
Microswitch

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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ELECTRIC CIRCUIT
Yellow
Red
Black - Red +
Black
Ignition Flame sensor
LED/ display light
GND
Battery
box
Totemp. limit
To solenoid valve
Microswitch

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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PRODUCT DIMENSION
160

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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INSTALL PLACE REQUIREMENT
Installation should be conducted by certificated professionals.
1) Preparation before installation:
zMake sure of accordance of all the accessories with the provisions in the instruction
zMake sure of accordance of the gas to be applied with the requirement of nameplate
2) Installation place requirement
zThe heater should be installed in a well ventilated place or room, such as: kitchen, a
room not used for living, well ventilated corridor
zThe height from floor to ceiling should be more than 2.4m
zThe air inlet port should be built up directly through to the outdoor air, and its section
area not less than 0.02m2, but must be more than that of exhaust tube. The height from
the floor should not be less than 30mm.
zMind: It is strictly prohibited to install the heater at the places stated below:
A. Bedroom, dressing-room, dark room, bathroom, living room
B. Basement, electrical appliance and meter room, boiler room
C. Sites where flammables, explosives or erosive material are located nearby.
D. Sites where significant vibration occurs or any other factors that may affect the
heater’s normal operation.
E. Kitchen cabinet
F. Somewhere nearby stairs or exit.

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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3) Position for installation
zSome effective measures must be taken if the heater is fixed on the wall, which is made
up of some inflammable materials. The insulation board should be with a length of all
sides 0.1m longer than that of the heater’s casing.
zA door must separate the bedroom near or next to the room or kitchen where the heater
is to be installed. The heater should be fixed at a position which is not only chosen
considering maintenance and working capability but also far from places where it may
be bumped or hit frequently, with more than 0.8m of space at the front and more than
0.1 m on both sides.
zIt is suggested that the heater is fixed at such position that the fire observation window
is kept on eye level with the user. This varies from user to user but generally it would be
1.5m high from the fire observation window to the floor.
zThe heater must not be installed below the telephone wire or electrical appliance.
Horizontally the area between the heater and any electrical appliances should be clear
for no less than 0.3m.
zHorizontal distance between the heater and gas meter and gas cooker should be no
less than 0.3m
zIt is prohibited to install the heater inside of or below a cabinet or a closet.A space no
less than 0.2m must separate the heater from curtains, furniture or any other
inflammable objects.
Inlet port
Here lead directly to the air outdoors.

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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zIt is not allowed to use the heater and the fan at the same time. If it is necessary, a
window or door must be opened.
zThe length of the gas tube which connects the heater to the gas pipe in the room or to a
gas bottle filled with liquefied petroleum gas (LPG), must be less than 2 meters.
zStandard installation
L
P
G

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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FIXATION OF HEATER
1) The place and the size of water inlet, water outlet and gas inlet to see the heater.
2) Drill two holes (Φ8, depth 50mm)in the wall according to the size of the A, and insert two Φ8
plastic expansion bolt into the holes.
3) Hang on the heater to score the point below the heater (B), take down the heater. Drill two holes
Φ6, depth 40mm, insert two Φ6 plastic expansions bushing into the holes.
4) Hang on the heater and screw down the Φ8 nut above the heater and the Φ6 screw below the
heater.
5) Check that the heater is fixed in a right position without any inclination, vertically and horizontally.
MM
A 160
B 160
C 450
D 300
E 440
F 125

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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WATER PIPE AND GAS PIPE
1) It must fix the controlling valves at the water inlet , outlet and gas pipe,
2) The wire and the gas pipe are not allowed behind or above the heater.
3) The length of the gas tube which connects the heater to the gas pipe in the room or to a gas bottle
filled with liquefied petroleum gas (LPG), must be less than 2 meters.
4) Check is needed to ensure that the gas pipe and water pipe do not leak after the heater is
installed.

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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EXHAUSTING PIPE
1) This product is Natural-flue type. While operating it consumes oxygen from the air of the room
and exhausts the fume out of the room by the flue pipe
2) The flue pipe must be fixed on the heater, and its installation should accord with the above
drawing
3) The flue pipe should be made up of heat-resistant and corrosion-proof materials (stainless steel
mainly employed by MTS). The joint of the flue should be reliably sealed without leakage.
4) The flue must have a capability sufficient to exhaust the fume, and the draft vacuity at the exit of
the fume should be no less than 3Pa.
5) The horizontal part of the flue should be laid in a slope of 1%~2% down the outside, and its length
must less than 3m.
6) There must be less than 4 elbows.
7) The vertical flue at the top part of the heater must be more than 250mm.
8) At the outlet of the flue, there should be a flue cap to prevent wind, snow and rain, and should not
be placed at a windy spot with a distance of the nearby building of at least 600mm.
9) It forbids to install the flue pipe in the ventiduct or common flue.

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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USE INSTRUCTION
1. Preparative
1) Fix 2pcs A1 dry battery into the battery box.
2) Open the gas valve and water inlet valve
3) Turn on the battery power switch which is located at the bottom of the heater
2. Ignition
Open the hot water valve, the heater will ignite automatically, but the water pressure must be
more than 0.025MPa.
It may be quite hard to light up the first operation due to air in the gas pipe. Simple try a few times
until operation starts.
3. Adjust the temperature of hot water
1) Adjust the water knob and the gas knob to reach the require temperature
2) Make sure the water pressure in the heater is more than 0.025MPa．
3) If the water pressure is too high the water will not be heated to the required temperature and
therefore needs to turn down the water inlet valve.
4) Cut the hot water valve, the heater will be flameout automatically.
5) Cut the inlet water valve and gas valve after the heater is used.
Mind:
1) To assure a long life for the heater, please do not use it for an exaggerated amount of time
2) The following situation is normal，do not think it is a malfunction.
Protection Situation Remark
High water pressure
protection Safety valve will open when the pressure is more than 0.8MPa To press down the pressure
20 minutes timing
protection After working for 20±3min, heater will stop for self protection automatically To restart
Water pressure too
low The heater is not ignition when the pressure is less than 0.025MPa. To restart after increase the pressure.
Too power pressure It is not ignition after use the heater
some time. To exchange battery
Over-heating
protection
The heater will stop automatically when
the temperature of hot water is more
than 77°C.
To restart after the water in
heater cools down.

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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GENERAL SAFETY INSTRUCTION
zMake sure of accordance of the gas to be applied with the requirement of nameplate
Example:
Gas type: NG (natural gas) 12T
Gas Pressure: 2000Pa
If the gas type of the heater needs to be exchanged, it must be conducted by certificated
professionals
zCheck whether the gas pipe leaks or not
Please smear soap water on the connector, to check whether the gas pipe leaks or not.
If abnormal in daily use, the heater must not be used again until it is check professionally. If the
gas pipe leaks, cut the valve, open the door or window immediately, do not use a lighter, cooker,
gas water heater or start any electrical product.
zIt is strongly prohibited to place flammables, explosives or corrosive material nearby the
heater
zDo not use the heater for any other purposes other than heating water such as drinking
water or drying clothing etc.
dangerous
Gasoline
Alcohol Match
Benzene

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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zIf the air temperature falls below 0℃, unscrew the water plug near the inlet and let out the
water in the heater, after that, screw down the plug. If the heater has not been used in a
long time please let the water out of the heater too.
`
zAsk for examination or repair
zDo not install the heater in a bathroom
The heater must be installed at a place or a position of a room where it is well ventilated, to
prevent a poisoning of carbon monoxide (CO), a colorless, odorless, highly poisonous gas,
formed by the incomplete combustion of carbon or a carbonaceous material, such as gasoline,
LPG, NG, etc.
zPrevent scald by hot water
Do not touch the hot water after restarting the heater to prevent scald by hot water.
Do not touch the cover of the heater except the knobs if the heater is in use or right after use.
zChose good LPG bottle reductor to ensure good work, and rated flux should be more than
1.2m3/hr when the heat rated power is more than 16KW.
Do not use the heater if there is a malfunction. Do
not take it apart without permission, but call the
service center.
Check heater every 2-3 years.
Water plug

Technology Manual – Instantaneous Gas Water Heater 5L/6L CF
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General failure & Solution
1. If the water heater is only used occasionally, it may switch off suddenly.
Cause:
¾Too low voltage of battery supplying for ignition control(IC) and gas solenoid valve.
¾ Too low water pressure. Microswitch is working on critical state of ON / OFF.
¾Water leakage happen on plastic septum inside water volume, too weak moving to drive
Microswitch steadily.
¾IC doesn’t work (failure);
Operation:
1> Check battery voltage and replace
2> Check ignition IC and solenoid valve
Close gas switch, push
Microswitch, to make the power connect to IC, then check as
following
-Ignition pole can spark or not;
-Solenoid valve can open (listen to the noise or touch to feel it shaking) or not;
If ignition and solenoid valve work correctly, open water tap (switch), check whether the microswitch is
working or not
, check water pressure by outlet water flow or pressure meter, then check water
valve, change parts or the whole water valve；
※Technology knowledge:
The working voltage of the battery (2 pcs, A1) needs to be more than 2.1V DC.
Electric meter like multimeter can be used to check battery.