FOGATTI FDG370IN User manual

TANKLESS GAS HOT WATER HEATER
FEATURING
• ENDLESS HOT WATER
• ON-DEMAND USAGE
• COMPACT, SPACE SAVING
• ENERGY CONSERVATION
• COMPUTERIZED SAFETY
MODEL
FDG370IN
FDG420IN

Installation Manual and Owner's Guide
— Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
● Do not try to light any appliance.
● Do not touch any electrical switch; do not use any phone within
your building.
● Immediately call your gas supplier from a neighbor’s phone. Follow
the gas supplier’s installation.
● If you cannot reach to your gas supplier, call the fire department.
— Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
WARNING:
Please place this manual in the water heater accessory for
reference whenmaintenance, adjustment or repair is required.
If you have any questions, please call or write to :
[e-mail]
Tel.: [phone]
Tankless Gas Hot Water Heater Installation Manual
If the information in these instructons is not
followed exactly, a fire or explosion mayresult
in property damage, personal injury or death.
02

1. Specification..................................
2. Introduction...................................
3. Safety Guide..................................
3.1 Security Definition...................
3.2 General....................................
4. Installation Instructions.................
4.1 General....................................
4.2 Installation Space....................
4.3 Installation Warning................
4.4 Typical Installation...................
4.5 Exhaust Pipe Specifications......
5. Venting Instructions.......................
6. Vent Termination Clearances.............
7. Combustion Air Supply......................
8. Gas And Gas Pipeline Specifications
9. Gas Connection..............................
10. Water Connection.........................
11. Pressure Reducing Valve...............
12. Electrical Connections..................
13. Initial Test Run..............................
5.1 General.....................................
8.1 General....................................
Contents
05
07
09
28
29
30
30
31
32
21
23
27
27
10
10
14
15
17
18
19
19
09
09
Owner'sGuide
14. Operational Safety....................
15. Operational Instructions...........
15.1 Built-in Controller..............
15.2 Controller Thermometer....
16. Troubleshooting........................
17. Maintenance.............................
18. Antifreeze System.....................
19. Gas pressure test position.........
20. Component Diagram.................
21. Wiring Diagram.........................
22. Packing List...............................
23. Warranty Notice........................
35
37
37
37
39
44
45
45
46
48
49
49
Installation Manual
11.1 Maintenance..........................
Tankless Gas Hot Water Heater Installation Manual
03

Congratulations and thank you for choosing
our tankless water heater. Before use, please
read this manual carefully and thoroughly .
Keep this manual for future reference. If you
need an additional manual, contact the
manufacturer or your local distributor. When
you call, please tell us the product name and
the serial number of your unit written on the
rating plate of the water heater.
Installation Manual
CONGRATULATIONS
Tankless Gas Hot Water Heater Installation Manual 04

Specification
MODEL
Natural Gas
Input(Operating Range)
BTU/h
PropaneInput(Operating
Range)BTU/h
Min:27,000
Max:145,000
Min:30,000
Max:170,000
Min:24,000M
Max:145,000
Min:24,000M
Max:170,000
15-150 (0.1-1)
3/4"NPT
3/4"NPT
psi(MPa)
"W.C.(kPa)Min 3.5 (0.87) Max. 10.5(2.61)
"W.C.(kPa)Min 8.0 (1.99) Max. 13.0(3.23)
lbs.(kg)40.8(18.5)
inch H 26.2 x W 17.1 x D7.3
H 665 x W 435 x D185
mm
Gas Connection
WaterConnections
Water Pressure*
Natural gas InletPressure
Propane InletPressure
Netweight
Dimensions
Ignition
Freeze-Protection
Electric Ignition
Electric
Supply VAC / Hz 120 /60
Consumption
Ratedpower W /A 43/0.6
Standby W /A 2/0.15
W /A 100/0.85
Water heater Category** CategoryⅢ
FDG370IN-NG
FDG370IN-LPG
FDG420IN-NG
FDG420IN-LPG
Tankless Gas Hot Water Heater Installation Manual
05

NOTE:
• Check the rating plate to ensure that this product matches your specifications.
• The manufacturer reserves the right to discontinue, or change at any time,
specifications or designs without notice and without incurring obligation.
Water heater Category — water heaters of other than direct vent type, for
outdoor installation, are divided into four categories based on static pressure
produced in the vent and flue loss.
Category I - a water heater that
operates with a non-positive vent
static pressure and with a vent gas
temperature that avoids excessive
condensate production in the vent.
Category II - a water heater that
operates with a non-positive vent
static pressure and with a vent gas
temperature that may cause
excessive condensate production in
the vent.
Category III - a water heater that
operates with a positive vent static
pressure and with a vent gas
temperature that avoids excessive
condensate production in the vent.
Category IV - a water heater that
operates with a positive vent static
pressure and with a vent gas
temperature that may cause
excessive condensate production in
the vent.
*15 psi or above is recommended for water maximum flow.
**The category of the water heater with respect to the venting system.
Tankless Gas Hot Water Heater Installation Manual 06

• This manual provides the information you need to install, operate, and
maintain your water heater.
• The model description is listed on the nameplate, which is located on the
side panel of the water heater.
• Read all installation instructions thoroughly before installing this product.
• If you have any questions or concerns about this device, please consult the
manufacturer or its local agent.
• The unit is a boxless gas fast water heater designed to effectively supply hot
water continuously during proper installation.
• This water heater can only be installed indoors for indoor models.
* This diagram illustrates tankless water heater design concepts only and
does not accurately represent the water heater's physical description.
Gas valves
Computer board
Gas
Water control valve
Flow sensor
Anti-freezing
Thermostat
Fan motor
Heat exchanger
Water temperature
sensor
Hot water
Cold water
Heating device
Over temperature
protection therm
Burners
Introduction
• The principle of an instant hot gas water heater is simple:
Tankless Gas Hot Water Heater Installation Manual
07

1. A hot water tap is turned on.
2. Water enters the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and sends a signal to the igniter to
create an ignition spark.
5. The gas ignites and flames appear within the burner chamber.
6. Water circulates through the heat exchanger and then gets hot.
7. Using thermistors to measure temperatures throughout the water heater,
thecomputer modulates the gas and water valves to ensure proper output
watertemperature.
8. When the tap is turned off, the unit shuts down.
This series of gas water heaters with solar linkage function by default:
a. When it is detected that the inlet water temperature reaches a
predetermined value, the water heater does not start;
b. When the combustion work is started, and the inlet water temperature
is less than the set temperature by 4℉ (2℃), the water heater stops
working;
c. When the combustion work is started, if the inlet water temperature is
≥140℉(60°C), the water heater stops working.
System start condition Normal combustion
conditions
Inlet water
temperature
(℉)
Set temperature -
inlet water
temperature
(℉)
95~149
(35℃~65℃)＜113(45℃) ≥7(4℃) ＜140(60℃) ＞4(2℃)
Controller
temperature
adjustment
range ( ) ℉Inlet water
temperature
(℉)
Set temperature -
inlet water
temperature
(℉)
Tankless Gas Hot Water Heater Installation Manual 08

Safety Definition
Safety Guide
DANGER
Indicates an imminently hazardous situation which, if not avoided,will
result in death or serious injury.
WARNING
Indicates an imminently hazardous situation which, if not avoided,could
result in death or serious injury.
Indicates an imminently hazardous situation which, if not avoided,could
result in minor or moderate injury.
Indicates information considered important but not hazard related.
NOTICE
CAUTION
General
1. Follow all local regulations, or in the absence of local regulations, follow
the current version of the US National Gas Code: , US ANSI Z223.1/NFPA 54
and/or ,Natural Gas and Propane Installation Code. CSA B149.1
2. Ground the equipment properly in accordance with all local regulations
or without local regulations, using the National Electrical Code: ANSI / NFPA
70 Canadian CSA standard C 22.1 or Canadian Electrical Code Part 1.
3. Carefully plan where you plan to install the water heater. please ensure:
Your water heater will have enough flammable air and proper ventilation.
Install the water heater in a location where water leaks do not damage the
surrounding area.(See page 11)
4. Check the gas type, gas pressure, water pressure and rated current on the
nameplate.
* If the unit does not meet your requirements, please do not install and
consult the manufacturer.
5. If any problems occur, turn off all hot water taps and turn off the gas.Then
call a trained technician or gas company or manufacturer.
!
!
!
Tankless Gas Hot Water Heater Installation Manual
09

1. Follow all local regulations, or in the absence of local regulations,
follow the current version of the US National Gas Code: US ansi z 223 . 1
/ nfpa 54 Canada b 149. 1 or natural gas, propane installation
specifications.
2. All gas water heaters require proper and careful installation to
ensure safe and efficient operation. This manual must be strictly
observed. Read the "Safety Guide" section.
3. The manifold pressure is preset at the factory. It is computer
controlled and does not require adjustment.
4.Maintain proper maintenance space when installing equipment, so
that it can be easily connected or removed.
5. The water heater must be installed in a place where it can be used at
any time with a suitable amount of combustion air. The indoor water
heater must be vented to the outside.
6. The electrical connection requires disconnecting the unit for
maintenance and safety to turn off the power to the water heater.
7. Do not install the unit where the exhaust vents point to any openings
in the building. Ensure that the vent terminal meets the required
distance from any door or opening by local regulations to prevent
exhaust gases from entering the building.
8. Lint and Carefully select the installation location of the water heater.
fine powder contaminants can block the air intake and reduce fan
operation. This in turn, can lead to burning anomalies and shorten the
life of the water heater. Regularly ensure that the area around the
water heater air inlet are free of dust, debris and other contaminants.
9. This water heater is for indoor installation only.
• The water heater requires a 3-inch exhaust pipe. See the
subsequent sections for more details.
• Only install the water heater in an area where the temperature is
not below freezing. THE WARRANTY DOES NOT COVER DAMAGE
CAUSED BY FREEZING.
• The water heater must be securely mounted to a wall or other
suitable structure.
• The water heater cannot be installed on the floor.
Installation Instructions
General
Tankless Gas Hot Water Heater Installation Manual 10

WARNING
!
• Water temperatures above 125°F
(52°C) can cause severe burns
orburns.The factory water
temperature is set at 107 °F (42 °C)
to minimize the risk of
burns.Always check the water
temperature before taking a
shower or shower.
• Do not store or use gasoline or
other flammable materials,
vapors or liquids near this
equipment.
• Do not connect to water or gas connections as this can damage the
valve and can cause serious injury or death.
• Do not use this product if it is immersed in water. Call a qualified
installer or service facility immediately to replace the water-immersed
water heater. Do not attempt to repair the unit. Must be replaced.
• Do not disconnect the power supply if the ambient temperature is
below freezing.The frost protection system is only effective when the
device has power. IF THE HEAT EXCHANGER IS DAMAGED DUE TO
FREEZING, IT IS NOT COVERED BY THE WARRANTY.
• Failure to follow these warnings can result in serious personal injury or
death.
Tankless Gas Hot Water Heater Installation Manual
11

WARNING
!
• Installation and repair must be performed by a qualified installer (for
example, a licensed plumber or gas fitter) or the warranty will be void.
• The installer (authorized professional) is responsible for properly
installing the water heater and complying with all national,
state/provincial and local regulations.
• The manufacturer does not recommend installing the water heater in
a pit or location where gas and water may accumulate.
• Do not point the vent to any operating window, door or opening to
the building.
• Do not install any air debris (such as a dryer) that could cause debris
to get trapped in the combustion chamber unless the system is directly
ventilated.
• Do not install the unit in water, debris or flammable vapors that may
enter the flue terminal or intake line.
• Due to safety issues, the manufacturer does not recommend installing
the water heater in the attic.Such as if you install the water heater in
the attic:
• Make sure the equipment has adequate combustion air and proper
ventilation.Failure to do so may result in carbon monoxide poisoning or
death.
• Keep the area around the water heater clean.When the dust collects
on the flame, the sensor will turn off the error code.
• Place the equipment for easy repair and maintenance.
• If a leak occurs, it is recommended to install a drain pan or other
waterproof protection under the water heater.
• Failure to follow these warnings can result in serious personal injury,
death and/or property damage.
Tankless Gas Hot Water Heater Installation Manual 12

• This water heater can only use potable water. Do not introduce pool,
well or hot spring water or any chemically treated water into the water
heater.
• For all other types of applications, the water hardness level for single
family applications should not exceed 7 grains per gallon (120 ppm) or
4 grains (70 ppm) per gallon.
The hardness of the water can cause scaling and can affect/damage
the water heater. Hard scale must be avoided or controlled by proper
water treatment.
• The pH of the water must be between 6.5 and 8.5.
• When the water heater is installed in a beauty salon, dry cleaner or
NOTICE he location where there is such a chemical in the air. Whenever
any other location, the manufacturer recommends direct venting.
Certain chemicals used in beauty salons or dry cleaners may affect the
flame sensor. In this case underneath, the water heater may not work
properly.
• Although the water heater is designed to operate with minimal sound,
the manufacturer does not recommend installing the unit on a wall
close to the bedroom or in a room for quiet study or meditation.
• As with any water heating device, there is possibility of leakage at
certain times during the life of the product. The manufacturer is not
responsible for any water damage that may occur. If you install a drain
pan under the unit, make sure it does not restrict the flow of
combustion air.
NOTICE
The warranty does not cover damage caused by water quality.
Tankless Gas Hot Water Heater Installation Manual
13

Installation space
Top
Bottom Front Back Sides
12"
(305mm)
12"
(305mm)
24"
(610mm)
0"
(0mm)
6"
(150mm)
Minimum clearances from combustible or noncombustible construction
and for servicing and proper operation:
Top
Bottom
Side
Side
Back
Front
Keep all space clear around the
water heater. Failure to do so
may cause fire, death, personal
injury or property loss.
WARNING
!
Tankless Gas Hot Water Heater Installation Manual 14

Installation Warning
For your safety, please read before installation.
NOTICE
Before installing the water heater, please contact your local gas supplier or
gas management department to select qualified gas pipes, pressure
regulators, cylinders, clamps, exhaust pipes, etc., Installator must be
entrusted to qulified professional techinicians or workers (please do not to
install by yourself, for improper installation may cause security issues, and
even endanger the user's life). Before installation, please reconfirm
whether the type of gas you use is the same as the gas specified on the
nameplate of the water heater.
The water heater is a forced-discharge type water heater, and the exhaust
gas produced by the water heater must be discharged to the outdoor
atmosphere in strict accordance with the requirements.It is strictly
forbidden to use this water heater without properly installing the exhaust
pipe according to the requirements of this instruction.
Shower head
Outlet valve
Exhaust pipe
Water heater
Outlet pipe
Inlet pipe
Air inlet
Gas inlet
Water supply pipe ≤78.7''(2m)
Inlet valve
1. Do not install in a place where
strong wind can blow, otherwise the
flame of the water heater will be
extinguished or incomplete
combustion will occur.
2. The water heater is forbidden to be
installed outside the house, to avoid
wind, sun and freezing of the water
heater.
3. The water heater inlet must be
connected to the outside, with
exhaust pipe installed.
wrong correct
Tankless Gas Hot Water Heater Installation Manual
15
7.87''(200mm)
11.8''(300mm)

4. It is strictly forbidden to install in the
closet.
5. Do not install near flammable materials
(such as curtains, gasoline/organic solvents,
etc.) and corrosive chemicals (such as
alcohol) to avoid fire or corrosion.
6. Do not install the water heater on the
vehicle or on the vessel.
7. There shall be no power line , electrical
equipment or gas pipeline above the
installation position of the water heater . The
horizontal distance between the water
heater and the electrical equipment shall be
greater than ; gas appliances 15.7"(400mm)
such as gas ovens and gas stoves shall not
be provided below ; and shall not be close to
the induction cooker or microwave oven.
Such as strong electric radiation appliances.
8. Install the water heater to the surrounding
walls and ceilings at a distance of
5.9"(150mm) or more. The installation
location should be no. For the construction of
combustible materials, if the installation site
is flammable or flame retardant , it should be
separated by heat-proofplate . The distance
between the heat-proofplate and the wall
should be greater than .0.39"(10mm)
9. The inlet valve should be installed at the
inlet of the water heater ; a gas shut-off
valve should be installed at the inlet of the
water heater.
10. The outlet of the exhaust pipe must be
outside the house.
11. Users of propane gas should use
qualified gas pressure reducing valves and
hoses to ensure the normal operation and
safe use of the water heater . Users who use
piped gas must ask the gas company or the
corresponding management department to
connect the gas pipe.
12. The power socket must be grounded
reliably.Otherwise, the water heater should
be grounded reliably.
＞12"(305mm)
＞6"(150mm)＞6"(150mm)
wrong correct
wrong
gas inlet
61～65"
correct
(1.55～1.65 m）
Tankless Gas Hot Water Heater Installation Manual 16

Typical Installation
1. Determine the installation location (see
installation precautions) and determine the
installation height. The height of the water
heater's operation display panel and the
human eye level are appropriate.
2. When installing the water heater, keep it
vertical and do not tilt.
3. As shown on the right, first install the
mounting hole on the wall. The upper
mounting hole is fixed by the expansion
screw, and the lower mounting hole is
inserted into the plastic plug. Hang the water
heater, place the washer and nut on top, and
tighten the nut. Screw on the self-tapping
screws below.
Precautions for installation of exhaust pipe:
1. The exhaust pipe must be installed when
the water heater is used.
2. The elbow and the straight pipe are
combined into a smoke exhaust pipe. One
elbow is equivalent to . But the 6 ft(1.8m)
total length of elbows and straight pipe must
not exceed .37 ft (11.5 m)
3. The installation of gas water heater pipe
should be outward and downward the slope
of 3° is such that when the outdoor
temperature is too low, the condensed water
does not flow back into the interior of the
water heater.
4. When the flue passes through a wall made
of combustible materials, it must be covered
with an insulating flame retardant material
greater than 1 inch thick.
The flue duct should have
a slope of 3° outward and downward
Elbow
Straight
pipe
The total length of elbows and straight
pipe must not exceed 37 ft ( 11.5 m ).
Installation method
Expansion screw
Plastic plug
Wooden screws
Tankless Gas Hot Water Heater Installation Manual
17

Height of adult eyes
from the ground
Higher than 6"(150mm)
Air exhaust outlet
Brick hole
Insulation board
Air inlet
Operation display panel
Higher than10"(250mm)
5. The flue should not be hidden in the ceiling
as much as possible. If it is unavoidable, it
needs to be wrapped with flame-retardant
insulation material, covering a thickness of 1
inch or more. The distance from the flue to the
combustible item should be greater than 1 ft.
6. The gap between the flue and the round
hole in the wall through which it passes
cannot be permanently filled with cement to
facilitate maintenance.
7. The exhaust vents shall not be installed in
the ventilation of the building and on the
common flue.
WARNING
It is absolutely forbidden to use this water heater without installing a
smoke exhaust pipe.
!
3 in (76 mm) 4 37 ft (11.5 m)
Max. No. of Elbows
(Number of 90° Elbows)
Max. Vertical and Horizontal (Total)
Vent Length
Diameter
• The maximum length of exhaust vent piping must not exceed 37 ft (11.5 m)
for venting, which depends on the elevation where the water 3"(76.2 mm)
heater is installed, Do not use more than 4 elbows. See the table below.
• When the horizontal vent run exceeds , support the vent run at 5 ft (1.5 m) 3
ft(0.9 m) intervals with overhead hangers.
Exhaust Pipe Specifications
Tankless Gas Hot Water Heater Installation Manual 18

Venting Instructions
General
WARNING
!
• Improper installation of ventilation on this equipment can
result in excessive carbon levels and carbon monoxide can
cause severe personal injury or death.
• Improper installation can result in nausea or suffocation,
serious injury or death from carbon monoxide and smoke
poisoning.
• Improper installation will void the product warranty.
Indoor models must be vented according to the current version of the
National Gas Code "Equipment Exhaust" section: US ANSI z 223 . 1 / NFPA 54
and/ or B 149. 1 natural gas section 8 Canadian propane and propane
installation specifications, And applicable local building codes.
*For each elbow added, deduct from max. vent length.5 ft (1.5 m)
* vent terminators, termination elbows, or rain caps.Length include
* The water heater shall use 3 "zv termination Horizontal vent terminators:
house with damper, part: 2svshtd vent terminators produced by Z-flex US Inc.
* Minimum clearance from Type B flue or vent connector to combustible
construction, . Type B Vent or Vent connector shall be used. 1 inches
37 ft (11.5 m)
32 ft (10 m)
27 ft (8.5 m)
22 ft (7 m)
17 ft (5.5 m)
3" (76.2mm) Straight tube length
Altitudes 0 to 3,000 ft (0 to 914 m)
Max. Vertical or Horizontal (Total) Vent Length
0
1
2
3
4
No. of Elbows
(Number of 90°
Elbows)
Tankless Gas Hot Water Heater Installation Manual
19