INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125X LP and 125X NG (Flow Modulated with Electronic Ignition)
Suitable for heating potable water only
Not approved for space heating purposes
Intended for variable flow applications with steady cold water inlet temperatures
WARNING
If the information in this manual is not followed
exactly , a fire or explosion may result causing property
damage, personal injury or death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible or corrosive 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 in your building.
- Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier, call the fire
department.
- Installation and service must be performed by a
qualified installer , service agency or the gas supplier.
WARNING: Improper installation,
adjustment, alteration, service or maintenance can
cause injury or property damage. Refer to this manual.
For assistance or additional information consult a
qualified installer , service agency or the gas supplier.
Upon completion of the installation, these instructions
6 720 606 520 (01.10) AL
should be handed to the user of the appliance for
future reference.
FEA TURING: Automatic V ariable Power Modulating Gas
V alve and Electronic Ignition
T ABLE OF CONTENTS
Specifications .................................................... Page 2
Rules for safe operation .................................... Page 4
Locating the Heater ............................................ Page 4
Combustion Air Requirements ............................ Page 5
Mounting the Heater........................................... Page 5
Venting the Heater ............................................. Page 6
Gas Connections ............................................... Page 7
Water Connections ............................................ Page 8
Safety before turning on the heater..................... Page 8
Operating instructions ........................................ Page 9
Setting water temperature .................................. Page 9
Maintenance & Service..................................... Page 10
Trouble Shooting .............................................. Page 10
Microswitch Adjustment ....................................Page 11
Electrical Diagram............................................ Page 12
Diagram of AquaS tar......................................... Page 13
Interior components diagram ............................ Page 14
Parts List ......................................................... Page 15
Principle of Operation:
When a hot water faucet is opened, the water flow through
the heater causes the gas valve to open. At the same
time a microswitch is activated which sends a spark to the
pilot. The flame sensor confirms the pilot has been lighted
and allows the first two burners to come on. The flame
sensor confirms correct activation and all burners come
on. The pilot goes off. The heat exchanger coils absorb
the heat generated by the burners and transfer heat to the
water. When the hot water faucet is shut of f, the gas valve
automatically closes and the burners turn off. Your hot
water faucet is an ignition key to activate the water heater ,
giving you control over your hot water energy use. Every
time you turn off your hot water faucet, the energy
consumption of your hot water returns to zero.
FEATURES
- Electronic Pilot Ignition
- High Quality Materials for Long Working Life.
- Copper heating coils for endless supply of hot water.
- Burner output proportional to hot water flow demand
for maximum energy efficiency .
AquaStar 125X LP and 125X NG Specifications
Gas Input max.: 117,000 Btu/hr
min.: 28,000 Btu/hr
Water Connection 1/2” Thread fitting
H x W x D 29 3/4” x 18 1/4” x 8 3/4"
Vent 5”
Gas Connection 1/2” NPT thread
Min. Water Pressure 18 Psi at 4 GPM
Max. Water Pressure 150 Psi
Shipping Weight 43 LB
Net Weight 40 LB
1.8 GPM at 90° rise
3.7 GPM at 45° rise
Min. Water Flow 1/2 gal/min
- Safety flame sensor at pilot burner.
- Automatic overheating protection shut-off sensor .
- Stainless steel burners with stabilized blue flame.
- Built-in corrosion resistant draft inducer.
- Compact space saver: mounts on a wall with two hooks.
- Easily removable one-piece cover.
- Easy one person installation.
- Adjustable water flow restrictor to ensure that water flow
demand will not exceed the heating capacity of the
heater.
- Electronic Pilot Ignition
- Safety Flame Sensor at pilot burner (not thermocouple)
- On/Off Switch to activate system
- LED indicator flashes before battery needs replacement
LP GAS Supply Pressure
(before Aquastar regulator) min. 1 1” W.C.
max. 14” W.C.*
Required LP GAS Pressure at inlet
tap while Aquast ar is operating: 10.5” W.C.
LP GAS Burner Manifold pressure while Aquastar is
operating at maximum input: 9.0” W.C.
Natural Gas Supply Pressure
(before Aquastar regulator) min.: 7” W.C.
max.: 14” W.C.*
Required Natural Gas Pressure at inlet
tap while Aquast ar is operating: 5.7” W.C.
Natural Gas Burner Manifold Pressure while Aquastar is
operating at maximum input: 4.2” W.C.
* Inlet gas pressure before Aquastar regulator must not
exceed this value. Pressure may need to be adjusted for
high altitudes, see page 7.
UNPACKING THE AQUASTAR HEATER
This heater is packed securely . The box includes two water connection fittings, a control knob, a gas pressure regulator ,
a pressure relief valve, an incandescent particle tray , two hooks for hanging the heater , this manual, a warranty statement
and a warranty registration card. Do not lose this manual, as there is a charge for replacement. Please complete
and return the enclosed warranty registration card.
2
D870_072
FRONT VIEW SIDE VIEW
MINIMUM INST ALLATION CLEARANCES FROM COMBUSTIBLE AND NON
COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS
MO DE L 125 X
TOP (A) 12"
FRONT (B) 4"
BACK 0"
SIDES 4"
FLOOR (C) 12" *
FLUE DIAMETER 5"
* Some local codes require 18” in garage installations
AQUASTAR MODEL 125X
3
GENERAL RULES TO FOLLOW
FOR SAFE OPERATION
1. You should follow these instructions when you install
your heater. In the United States: The installation must
conform with local codes or, in the absence of local codes,
the National Fuel Gas Code ANSI Z223.1/NFP A 54.
In Canada: The Installation should conform with CGA
B149.(1,2) INST ALLATION CODES and /or local installation
codes.
2. Carefully plan where you install the heater. Correct
combustion air supply and flue pipe installation are very
important. If not installed correctly, fatal accidents can be
caused by lack of air, carbon monoxide poisoning or fire.
3. The place where you install the heater must have enough
ventilation. The National Fire Codes do not allow gas fired
water heater installation in bathrooms, bedrooms or any
occupied rooms normally kept closed. See the section below
on locating the heater.
The heater may still operate even when improperly vented.
It will, however, be less ef ficient and could eventually damage
the heater. It could even result in human sickness or death
due to oxygen deprivation and carbon monoxide poisoning.
Follow the guidelines below:
1. Place your heater as close to a vent or chimney as
possible.
2. National building codes require that you do not install
this appliance in bathrooms, bedrooms or any occupied
rooms normally kept closed.
3. Simultaneous operation of other appliances such as
exhaust fans, ventilation systems clothes dryers, fireplaces
or wood stoves could create a vacuum effect in your home
which could cause dangerous combustion by-products to
spill back into your home rather than venting to the outside
through the flue. Confirm that your Aquastar is venting
properly when all these other appliances are running. See
section on venting.
4. You must vent your heater . See section on VENTING,
Page 6.
5. The appliance must be disconnected from the gas supply
piping system during any pressure testing at pressures in
excess of 1/2 Psig (3.5 kPa).
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or less than 1/2 Psig (3.5Kpa).
The appliance and its gas connection must be leak tested
before placing the appliance in operation.
6. Keep water heater area clear and free from combustibles
and flammable liquids. Do not locate the heater over any
material which might burn.
7. Correct gas pressure is critical for the optimum
operation of this heater (see specifications on page 2). Gas
piping must be sized to provide the required pressure at
the maximum output of the heater, while all the other gas
appliances are in operation. Check with your local gas
supplier, and see the section on connecting the gas supply .
Do not obstruct the flow of combustion and ventilation
air to the appliance. If installed near a clothes dryer it is
very important that the dryer be properly vented. Failure to
properly vent a dryer could result in a gradual accumulation
of lint on the water heater fin coils and burners, leading to a
dangerous condition of vent blockage and poor unsafe
combustion.
4. Y our hot water lines should be kept short to save energy .
It is always best to have hot water lines insulated.
WARNING: The water in this water heater is cold
and always remains cold except for the times that hot
water is being used DO NOT INSTALL IN AN AREA
WHERE IT COULD FREEZE.
This heater is neither designed for nor approved for
outside installation.
Drain the heater entirely if freezing temperatures are
anticipated in area where heater is installed by
disconnecting both the inlet and outlet elbow
connections at the rear of heater. Additionally remove
the drain plug under the water valve. See Fig. 0.
8. Should overheating occur or the gas supply fail to shut
off, turn off the gas supply at the manual gas shut off valve
on the gas line.
9. Do not use this appliance if any part has been
underwater. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the
control system and any gas control which has been
underwater.
PROPER LOCATION FOR INSTALLING
YOUR HEATER
Carefully select the location of your new heater. For your
safety and for proper heater operation, you must provide an
abundant supply of combustion air and a proper venting
installation.
4
Fig. 0 - Water heater drain plug
WARNING: Flammable materials, gasoline,
pressurized containers, or any other items or articles
that are potentially fire hazards must NOT be placed
on or adjacent to the heater. The appliance area must
be kept free of all combustible materials, gasoline
and other flammable vapors and liquids.
This product is not approved for manufactured homes
(mobile home), recreational vehicles (RV) or boats.
Reference ANSI Z21.10.3.
This product is neither designed or approved for
outside installations.
COMBUSTION AIR REQUIREMENTS
The AquaStar water heater holds cold water in its copper
heat exchanger and brass water valve when not in use.
Because of this, any cold air that comes in through the
unit’s vent pipe is capable of freezing these components.
This Installation Manual specifies the minimum vertical vent
pipe and the amount of combustion air required for this
unit. The vent pipe must not be restricted and its 6 foot
minimum height (provided there are no elbows) must
terminate 2 feet above any obstruction within a 10 foot
radius.
When all requirements are followed, the unit will operate
properly and safely. However, there may still be a risk of
freezing due to negative draft if all the combustion appliances
in the area are not being supplied with a sufficient amount
of make-up air. A wood stove or furnace can rob the makeup air in the AquaS tar’s vent pipe, leaving the cold infiltrating
air capable of freezing the cold water in the AquaS tar heat
exchanger. More make up air is the solution. Follow the
instructions on venting and checking adequacy of make up
air. A HVAC specialist should be used to design solutions
for providing more make-up air if necessary.
Louvers, grills and screens have a blocking effect. If the
effective free area is not known, increase the sizes of your
openings by 75% if your louvers are wood and by 30% if
your louvers are metal. Refer to the National Fuel Gas Code
for complete information. In buildings of tight construction
all air should be taken from outside.
CLEARANCES
The Aquastar 125 X is design certified for inst allation on a
combustible wall and for installation in an alcove or closet
with the minimum clearances to combustible and non -
combustible construction listed below
A. Top 12 inches (306 mm)
B. Front 4 inches (102 mm)
C. Back 0 inches
D. Sides 4 inch (102mm)
E. Bottom 12 inches (306 mm)
Clearance from vent is dependent upon the clearance rating
of the venting material used. For example: type B-1 vent is
approved for 1 inch clearance.
Note: Minimum clearance to combustible materials should
not be less than 6" for single wall flue pipe. Note that this
clearance can be reduced if combustible material are
protected as per table VI of the National fuel Gas Code or if
Type B gas vent is used.
MOUNTING INST ALLATION
Observe the following instructions concerning combustion
air.
Appliances located in unconfined spaces:
a) An unconfined space is one whose volume is greater
than 50 cubic feet per 1000 Btu per hour of the combined
rating of all appliances installed in the space.That would
be 5850 cubic feet for the AquaS tar 125X alone.
b) In unconfined spaces in buildings of conventional frame,
masonry, or metal construction, infiltration is normally
adequate to provide air for combustion, ventilation, and
dilution of flue gasses.
Appliances located in confined spaces:) The confined space
must be provided with two permanent openings, one
commencing within 12 inches of the top and one
commencing within 12 inches of the bottom of the
enclosure. Each opening must have a minimum free area
of one square inch per:
- 1000 Btu/hr if all air is taken from inside the building.
- 2000 Btu/hr if all air is taken from the outside by horizontal
ducts.
- 4000 Btu/hr if all air is taken from the outside by direct
openings or vertical ducts.
Or the confined space must be provided with one permanent
opening or duct that is within 12 inches of the ceiling of the
enclosure. This opening must have a minimum free area of
one square inch per:
- 3000 Btu/hr if all air is taken from the outside by a direct
opening or vertical duct.
The Aquastar 125 X is design certified for mounting on a
wall.
Secure the two L shaped hooks provided with the heater to
a wall surface. Place them 13 ¼ inches apart as shown in
Fig 1.
Do not install this appliance on a carpeted wall or over floor
covering which is combustible, such as carpet. The heater
must be mounted on a wall using appropriate anchoring
materials. If wall is a stud wall sheathed with plasterboard,
it is recommended that support board(s), either 1x4’s
or 1/2" (minimum) plywood first be attached across a
pair of studs and then the heater should be attached
to the support boards. See Fig 1.
Expansion and contraction of piping due to changing water
temperature in the pipes imparts movement to the heater
which, if mounted directly to a brittle, friable board, such
as plasterboard, can cause failure of mounting.
In earthquake-prone zones, CEC recommends that
installers use a large washer and lag screw through the
existing holes used to hang the heater to affix the upper
third of the heater to the mounting board. T o affix the lower
third of the heater, CEC recommends that two new holes
be drilled in the heater’s frame, each one 16 inches below
the top two holes, and that washers and lag screws be
used to secure the lower portion of the heater to a spacing
board.
Before installing the unit, be certain you have the correct
heater for your type of Gas – Propane or Natural Gas.
Identification labels are found on the shipping box, and on
the rating plate which is located on the right side panel of
the cover. Also, each burner orifice is stamped with a number
(79 for LPG and 120 for Natural Gas).
5
at least 1/4 inch for every foot of its horizontal length. Keep
the horizontal section short and avoid too many elbows.
WALL STUDS
13 ¼”
SUPPORT BOARD
1” X 4”
SPACE BOARD
Fig. 1 - Mounting the Heater
The incandescent particle tray (shipped loose in the carton
with the water heater) must be attached at the bottom of
the water heater front cover at the time of installation. Use
the screws provided. See figure 2
SCREWS
INCANDESCENT PARTICLE TRAY
Fig. 2 - Incandescent Particle Tray Illustration
VENTING
Vent pipe connection. W ARNING: Do not reduce
the vent pipe size.
This appliance must be vented to the outside following all
local ordinances and specifications for installing a gas
appliance vent or chimney. The venting system must be
designed and constructed so as to develop a positive flow
adequate to remove flue gasses to the outdoors. Minimum
vent size must be 5". Minimum vent height must be 6
feet, provided there are no elbows. Termination of
the vent must be 2 feet above any obstruction within
a 10 foot radius of the vent pipe. Consult your gas
utility or National Gas Fuel Code if vent will have
elbows or share venting with another appliance. The
vent connector should have as much vertical rise as
possible (minimum 12”) before any horizontal run.
Optional powervent available in order to sidewall vent.
Contact your local dealer . The appliance must be located
as close as practicable to a chimney or vent. The vent pipe
sections must be secured to each other with sheet metal
screws. Keep in mind the minimum clearance from the top
of your heater. Remember also that single wall vent pipe
connectors require a 6 inch clearance from combustibles.
National Fuel Gas Code specifies double wall — T ype “B”
— vent pipe be used in cold climates and for gas vents
running through attics. We consider double wall vent pipe
preferable in all circumstances. Any vent section greater
than 45 degrees from vertical is considered horizontal.
Horizontal sections of vent connectors must slope upwards
T o check the draf t:
Close all doors and windows to the outside.
Turn on all appliances that force air out of the building.
These include all exhaust/ventilation fans, furnaces, clothes
dryers, wood burning stoves, etc.
Open all doors between the AquaStar and these other
appliances.
Run the unit for at least 10 minutes. Then hold an ordinary
mirror at the side above the front shell. Any flue gases
backdrafting will cause the mirror to fog. This is a serious
health hazard and must be corrected. Poor venting can
result in soot building up inside the heater, overheating of
the heater and freezing of the heat exchanger in a freezing
environment.
The mirror will remain clear with a properly functioning draft.
WARNING
Note: The burners of an instantaneous “on demand” water
heater such as the AquaStar are only on at the time that
hot water is actually being used, the vent pipe is therefore
cold except for the short durations when hot water is being
used, it is therefore very important that the venting and air
supply be adequate to provide a good positive draft as
soon as the burners turn on. See venting guide on back
page.
The AquaS tar 125X instantaneous water heaters have builtin draft diverters and are designed for indoor installation
only. The draft diverter outlet must be connected to a clear ,
unobstructed vent of the same size, or larger.
In Canada, CAN/CGA-B149 Installation Code for detailed
requirements
In U.S.A., ANSI Z223.1 - NFPA 54, national Fuel Gas
Code for detailed requirements.
The flue connection for the AquaStar 125X is 5 inches.
However, in CANADA, for installations at high altitude (2000-
4500 feet above sea level) a six inch flue is required. A 5"
by 6" flue adaptor must be affixed to the flue collar of the
AquaStar with at least two screws. See figure 3.
WARNING: Failure TO INCREASE THE VENT SIZE
TO SIX INCHES AND/or assure that the manifold pressure
is set to proper value listed for applications at high altitudes
will cause unsafe venting, asphyxiation, and will void CSA
Certification.
5” X 6” ADAPTOR
USED ON HIGH ALTITUDE
Fig. 3 - Flue Adaptor for High Altitude Canadian
Installations
6
GAS CONNECTIONS and Gas Regulator
GAS LINE SIZING
Before connecting the gas supply, check the rating plate
on the right side of the front cover to be sure that the heater
is rated for the same gas to which it will be connected.
In the United States: The installation must conform with
local codes or, in the absence of local codes, the National
Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform with CGA B149
INST ALLATION CODES and /or local installation codes.
NOTE: The Aquastar 125 X is supplied with a gas
pressure regulator that must be installed on the heater
before attaching the gas supply line. See figure 4.
Failure to install the gas regulator as shown in figure
4 will be a violation of CSA certification of the unit.
The regulator supplied with the heater is preset for
the gas shown on the rating plate to the correct
pressure. It is an appliance level regulator designed
for (low inlet) pressure (less than 1/2 Psig or 15” W.C.)
DO NOT connect to an unregulated or high pressure
propane line or to a high pressure commercial natural
gas line.
GAS INLET PIPE
PRESSURE TAP
-It is strongly recommended that the Natural Gas pipe
be Black Iron pipe the entire distance from the outside
meter to the inlet of the Aquastar regulator . 1/2” Black
Iron pipe up to 10 feet, 3/4” Black Iron pipe up to 40
feet and 1” Black Iron pipe up to 150 feet distances.
Flex line tubing is NOT recommended, but if used
then oversize it.
-It is strongly recommended that the LP Gas pipe be
semi-rigid copper or Black Iron pipe from the outside
regulator to the inlet of the Aquastar regulator. For
semi-rigid copper piping: 5/8” up to 20 feet and 3/4”
up to 60 feet distances. For Black Iron piping: 1/2” up
to 45 feet and 3/4” up to 160 feet distances. Flex line
tubing is NOT recommended, but if used then oversize
it.
THESE FIGURES ARE FOR AQUASTAR SUPPLY ONL Y ,
ALL OTHER APPLIANCES IN THE BUILDING WILL NEED
TO BE INCLUDED IN THE PIPE SIZING .
National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances not so equipped. The
drip leg must be accessible and not subject to freezing
conditions. Install in accordance with the recommendations
of the serving gas supplier.
PLASTIC VENT CAP
PRESSURE REGULAT OR
(with directional arrow on
reverse side pointing
upward)
Fig. 4 - Installation of Gas Pressure Regulator
The pressure regulator provided with the heater is adjusted
to deliver the proper gas pressure (as indicated on the
rating plate and in the manual for altitude up to 2000 feet
(660 meters) above sea level. On appliances being installed
above 2000 ft (660 meters) elevation, the inlet gas pressure
should be set at installation to the value shown below.
NOTE: The gas pressures specified below refer to
pressures taken at the test pressure nipple on the gas
inlet pipe just above the regulator (See Fig 4). These
readings should be taken while the heater is operating
at full input — i.e. maximum water flow with the
temperature dial selector turned all the way
clockwise.
MAXIMUM INLET GAS FLOW PRESSURE SETTING
WARNING: The heater must be disconnected from
the gas supply piping system during any pressure testing
of that system at test pressures in excess of 0.5 psig.
The water heater must be isolated from the gas supply
piping system by closing the manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or less than 0.5 psig.
The water heater, including the pressure regulator provided
with it, must not be operated at gas supply pressures in
excess of 0.5 psig. If overpressure has occurred, such as
through improper testing of the gas lines or malfunction of
the supply system, the gas valve and regulator must be
checked for safe operation. Make sure that the regulator
vent is protected against blockage. Vent blockage could
occur during ice storms.
When your connections are made, check for gas leaks at
all joints (not just the ones you made). Apply some soapy
water to all gas fittings and gas valve. Soap bubbles are
a sign of a leak.
NOTE: Do not apply soap solution to pilot filter screen or
pilot orifice area. If you have a leak, shut off the gas. After
verifying that required gaskets are in place, tighten
appropriate fittings to stop leak. Turn the gas on and check
again with a soapy solution. Never test for gas leaks
using a match or flame.
Altitude Natural Gas Liquid Propane
inches W.C: inches W. C:
0' - 2.000 ft 5.7" 10.5"
2.000 ft - 4.500 ft 4.6" 8.4"
Above 4.500 ft consult your local gas provider .
7
WATER CONNECTIONS
When facing the heater, the cold water inlet is on your right
and the hot water outlet is on your left.
Although water piping throughout your structure may be
other than copper, we recommend that copper piping be
used for at least three feet before and after the heater (follow
local codes if more stringent). Keep water inlet pipe to no
less than 1/2 inch diameter to allow the full flow capacity.
Remember that water pressure must be sufficient to activate
the heater when drawing hot water from the top floor. If the
hot and cold connections to the heater are reversed, the
heater will not function. The AquaStar 125X is provided with
two flexible type connectors that must be connected to the
inlet and outlet fittings of the water valve as shown in Figs
5 and 6. ½” Galvanized or brass fittings work best when
connected to the connectors. See Fig 6. These connectors
seal to the water valve by means of a union connection
with a washer type gasket at the joint. No pipe dope or
thread tape is to be used at these joints. Be certain there
are no loose particles or dirt in the piping. Blow out or flush
the lines before connecting to the AquaS tar . Full port valves
should be installed on both the cold water feed line and the
hot water outlet line to facilitate servicing the heater .
For installation on a private well system, be sure that the
water pressure is set between 30 and 50 psi.
INLET
WASHER
WA TER FIL TER
WA TER V ALVE
The location of the PRV must be readily accessible for
servicing or replacement., and be mounted as close to the
water heater as possible. See Fig 7. To install the PRV , a
suitable fitting connected to an extension on a “T” fitting
can be sweated to the hot water line.
Pressure
Pressure
Relief
Relief
Valve
Valve
HWSHWS
CWSCWS
Fig. 7 - Pressure Relief Valve
OPERATING INSTRUCTIONS
Before proceeding with the operation of the heater make
sure that the system is filled with water.
Open the cold water inlet supply to the heater fully .
Open a hot water faucet to permit the water to fill the heater
and the piping and to eliminate the air trapped in the system
Close the hot water faucet after the water flows freely and
all the air has escaped from the system. The water heater
is now ready to operate.
FLEX
CONNECTORS
WASHER
OUTLET
Fig. 5 - Water valve and water
connectors, top view
THREADED ASSEMBL Y SWEA TED ASSEMBLY
1/2” FLEX
PIPE PRV TO
APPROPRIATE
DISCHARGE
1/2” FLEX
PIPE PRV TO
APPROPRIATE
DISCHARGE
S FITTING
Fig. 6 - Plumbing connections for the Aquastar 125X
Connecting the pressure relief valve (PRV)
A listed pressure relief valve supplied with the heater must
be installed at the time of installation. No valve is to be
placed between the PRV and the heater. No reducing
coupling or other restriction may be installed in the
discharge line. The discharge line must be installed such
that it allows complete drainage of both the PRV and the
line.
FOR YOUR SAFETY READ BEFORE
OPERATING YOUR HOT WATER HEATER
Warning: If you do not follow these instructions exactly ,
a fire or explosion may result causing property
damage, personal injury or loss of life.
A. This appliance is equipped with electronic ignition for
lighting the pilot and main burners. When turning the heater
on, follow these instructions exactly.
B. Before operating the unit, set the On/Off switch to the
On (I) position. The On/Off switch is located behind the
flip-down coverplate on the front panel strip. Smell all around
the appliance area for gas. Be sure to smell next to the
floor because some gas is heavier than air and will settle
on the floor.
WHA T TO DO IF YOU SMELL GAS
- Do not try to light any appliance.
- Do not touch any electric switch; do not use any phone
in your building
- Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier, call the fire
department.
C. Use only your hand to push in the on/off control button.
Never use tools. Follow these instructions exactly . If control
button is jammed, close the gas supply and call a qualified
service technician. Attempted forceful repair may result in
a fire or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the control
system and any gas control which has been under water.
8
LIGHTING AND OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on this label.
2. The gas valve must be shut off by putting the ON/OFF
switch to position “0”. Wait five (5) minutes to clear out
any gas. If you smell gas, STOP! Follow “B” in the safety
information above. If you do not smell gas, go to the
next step.
3. This water heater is equipped with a safety pilot burner
and an automatic ignition control system.
4. Set the ON/OFF switch (flip down cover plate on frontal
panel strip) marked I/0 to the I position. In this position,
the water heater is ready to use.
5. If the red LED indicator light (visible through the
peephole in the front panel strip) is flashing, this is a
warning that the batteries are less than 1.2 Volts and
will need to be replaced within the next couple of weeks.
Plan to have two D type 1.5 volt long-life (Alkaline)
batteries available for replacement.
6. Turn the hot water faucet on the minimum flow rate
required to activate the heater. The automatic ignition
system first ignites the safety pilot burner which then
ignites the main burner in about 4 seconds.
7. The pilot flame will extinguish 10-30 seconds after the
burners come on. The burners will remain on until the
hot water tap is turned off.
TEMPERATURE
ADJUSTMENT KNOB
Fig. 8 - T emperature Adjustment Knob
The position you select on the temperature adjustment knob
will depend on the temperature of the incoming water (50°F
is average in the U.S.). In warm weather regions where the
incoming cold water is generally warmer, or during the hot
weather months in some other areas a midway setting on
the temperature adjustment knob would produce a
temperature rise of about 70°F, giving an output of
approximately 120°F . At this setting, if it is still necessary ,
one could mix a small amount of cold water in a shower
and have a comfortable shower at about 3 gallons/minute.
During the colder months, or in cold climate areas, it might
be necessary to set the control to the maximum position,
all the way clockwise to the right.
Do not supply the AquaStar 125X with preheated water.
For this type of application, purchase a solar model 125B
LPS or 125B NGS.
NOTE: On a first time initial installation, existence of air in
the gas supply line and in the water line may cause some
ignition delay . In that case, repeatedly open and close the
hot water tap in order to restart the ignition process until
all the air has been purged.
TO TURN OFF GAS TO APPLIANCE
Turn off the manual lever on the gas supply line to the
heater and set the ON/OFF switch to the OFF ( 0 ) position.
See Fig 9.
SETTING THE WATER TEMPERATURE
The AquaS tar 125 X LP and 125 X NG water heaters have a
gas control that modulates burner input in response to flow.
Its purpose is to ensure that the hot water temperature will
remain steady, although the water flow demand might vary
(down to 1/2 gal/minute). T o adjust the temperature on your
AquaStar, turn on a hot water faucet to its maximum flow.
At the water heater, turn the large knob located beneath
the main gas control on the front of the heater all the way
to the right (clockwise). See Fig 8. This will produce a
temperature rise of approximately 90°F at flow rates between
0.5 and 2.0 gallons per minute. Given that average incoming
water temperatures are 50°F, this heater will produce
approximately 140°F water at these flow rates. Turning the
dial all the way to the left (counterclockwise) will produce a
temperature rise of approximately 45°F for flow rates
between 1.1 and 3.7 gallons per minute. It is safest to select
a comfortable temperature and not have to mix in cold water .
Align batteries as
shown
G667_092
To operate the heater, set the ON/OFF switch to position I.
The switch is located behind the flip down cover plate on
the front panel strip.
To shut down the gas to the heater, set the ON/OFF switch
to position 0
G667_091
Temperature Adjustment Knob
Decrease temperature
and increase flow
If the LED light is flashing, prepare to
replace the batteries. Use two D cell
(1.5 volt) long life alkaline batteries.
G667_090
Increases temperature
and decreases flow
G661_004
Fig. 9 - Principles of Operation
9
MAINTENANCE AND SERVICE
REVIEW MAINTENANCE TABLE ON THE BACK
OF THIS MANUAL
Approximately once a year, the AquaS tar should be checked
and cleaned. To remove the front cover, first remove the
incandescent particle tray, then pull off the temperature
adjustment knob and unscrew and remove the plastic collar.
Pull main cover out toward you and lift up and out. THE
FOLLOWING OPERA TIONS SHOULD BE PERFORMED
BY A QUALIFIED SER VICE PERSON:
Vent System: Should be checked annually. Clean and
repair as needed.
Water V alve (Part # 8707002534): The water valve on this
heater should be serviced periodically . Lubricate component
#25 on page 14 with a small amount of silicon, faucet or
lithium grease every two years to keep its o rings fresh and
pushrod sliding smoothly. Every 3-5 years replace
components #25 and #26 on page 14. The frequency will
depend on the mineral content of the water and conditions
of use or whenever signs of corrosion appear at the gas
and water valve joint. Periodically check that the water inlet
filter (#28 on page 14) is clean as well.
Pilot Flame: The pilot flame should burn with a clean,
sharp, blue flame and should resemble the diagram in
Fig.10. If the flame is soft and yellow , the pilot burner orifice
may need to be cleaned or replaced. The pilot flame should
be approximately 2 inches long, extending past the flame
sensor. If the flame is too small, it will not reach the flame
sensor and the burners will not come on.
3mm
Do not use any wire or sharp object to clean orifices.
Natural gas orifices are large enough that you can usually
clean them by blowing through them. LP orifices, on the
other hand, are too small to clean and should be replaced.
To access the pilot orifice, remove 2 screws holding pilot
assembly in place. Then loosen compression fittings to
expose pilot orifice.
PILOT ORIFICE
Fig. 11 - Pilot burner with pilot orifice
Main Burner Flames: The main burner flames should be
blue, with a more intense blue cone in the center core.
Y ellow flames could be a sign of wrong size gas orifices or
dirty burners, or a blockage on the heat exchangers fins.
If some burners have yellow flames while others have good
flames, it is likely that dust, lint or spider webs have partially
clogged the burner venturis. T o clean the burners, contact
a gas service person.
Correct gap between pilot
burner tip and electrode tip
Piezo Electrode
Flame sensor
Piezo
Electrode
Fig. 10 - Characteristic Pilot Flame
To clean the pilot burner and/ or the pilot orifice : Turn
off the gas to the unit. Set the On/Off switch to Of f (position
0). Remove the cover of the heater. To do so, pull off the
temperature adjustment knob and unscrew and remove
the plastic collar. Pull main cover out toward you and lift
up and out. The pilot orifice should be cleaned or replaced.
Do not enlarge the orifice.
Mineral Scale Build-up: The AquaStars heater, when
operated at lower temperature settings, do not accumulate
mineral build-up. If however, the heater is used at the higher
temperature settings and the water has a high mineral
content, periodic descaling may be necessary . The heating
coils should be flushed with a descaling solution. Consult
your dealer or Controlled Energy for instructions.
TROUBLE SHOOTING (see maintenance table)
Introduction
The AquaStar 125X burners are activated by a water flow
valve. Numerous water related problems can cause this
water valve to malfunction such as: Insufficient water flow
volume to activate the burners at its minimum flow
requirement; Dirt in the water flow valve causing it to
malfunction; Sediment build-up in faucet aerators, or
shower heads; Uneven pressures between cold and hot.
(with single lever faucets) Plumbing cross overs. These
water flow related problems can cause the heater to deliver
less than its full output, or to fail to ignite or to shut down
completely .
Problems are stated in upper case, bold face. Most
common causes for the problems follow in order of
likelihood. The suggested solutions require that the cover
be taken off. To do this, remove incandescent particle tray ,
pull off the temperature adjustment knob and unscrew and
remove the plastic collar. Pull main cover out toward you
and lift up and out.
10
NO SPARK AT THE PILOT
1. On/Off switch is not ”On” (Position I).
The On/Off switch is located behind the flipdown cover
plate on the front panel strip. See fig. 9.
2. Water flow is not sufficient to activate heater.
Water flow rate at faucet is below minimum flow needed
to activate heater. When temperature adjustment knob is
turned all the way clockwise, the AquaStar model 125X
requires 1/2 gallon per minute flow to activate the heater.
As a reference, this is a flow which would fill a quart jar in
30 seconds. If the temperature adjustment knob is turned
fully counterclockwise, a flow rate of 1.1 gallons/minute is
required to activate the heater.
3. Water inlet filter is clogged
Water flow is restricted, preventing needed flow to activate
heater. Clean water inlet filter screen.
7. Cold incoming water connection made to wrong
side of heater
Make sure cold water inlet connection is on the right side
of heater when you are facing heater.
8. Water valve parts may be dirty or components
damaged
First check that venturi is free of dirt particles. Water valve
and component parts must be totally free of dirt. In hard
water areas, mineral deposits can eventually (3-5 years in
hard water areas) corrode the water valve parts to a point
where they will need replacing. Any sign of moisture at
the bleed hole is a sign that the water valve
components need to be replaced immediately.
9. Loose connection at the ECO
Ignition sparker will not operate if the electrical circuit is
interrupted. Check that the connections to the ECO are
secure and tighten if necessary .
4. Cross over in water lines
T o confirm there is no cross-over in the plumbing, shut of f
the cold water supply to the AquaStar water heater and
open a hot water faucet. There should not be any water
flowing at that faucet. Water running is a sign of a plumbing
cross-over. Consult your plumber.
5. Batteries are weak
The LED light (seen through the peephole in the coverplate
on the front panel) flashes when the batteries are less
than 1.2 volts. Replace batteries with D cell (1.5 volt) long
life alkaline batteries as shown in fig. 9.
6. Microswitch needs to be adjusted or replaced.
If you do not hear a click when a tap is opened, the
microswitch needs to be adjusted. See Fig. 12 for
adjustment, or replace the microswitch if the heater has
been in use for some time.
SP ARKS APPEAR AT PILOT WHEN HOT WATER TAP
TURNED ON, BUT PILOT AND BURNERS WILL NOT
IGNITE
1. Air in the Gas Line
Normally this is a problem at time of initial installation, after
the pipes have been worked on, or after a gas supply line
has been allowed to empty. Bleed the air trapped in the
gas line by turning the hot water faucet on and off until the
air has been cleared from the line.
2. No gas to the AquaStar
A. Gas cock on gas line may not be open
B. Gas regulator may be shut or damaged. Replace or
unjam the regulator. Note: The regulator furnished with
the heater is exclusively designed for low gas pressure.
Excessive pressure will lock it up. Jamming usually
happens when using propane gas if f the gas pressure
between the gas tank and the water heater’s gas regulator
has not been reduced. See Page 2 for recommended
correct gas pressure. To unjam a regulator, consult your
gas supplier or call CEC.
3. Pilot orifice or gas valve is dirty
Clogging of the pilot burner can be caused by dust in the
air or dirt in the gas. The pilot orifice or gas filter may need
to be cleaned or replaced.
Adjusting screw
G871_212
Fig. 12 - microswitch adjustment
Pilot does not spark with
water flow
Close water tap 1 Close water tap
1
2 Remove screw cap and
unscrew adjusting screw till
sparking starts
3 Screw in turning one and
half turns
Pilot is always sparking
without water flow
2 Screw in adjusting screw,
till it stops sparking
3 Continue to screw in
turning one and half turns
more
4. Water valve assembly needs to be checked
If the pilot orifice is clean, the water valve assembly should
be checked. The adjustment screw on the water valve
micro-switch may not be tight enough (Fig. 12). Remove
central cap beneath micro-switch assembly, carefully
loosen the adjustment screw until the pilot light ignites. At
that point retighten the screw one and a half turns.
5. Pilot electrovalve switch may need to be replaced
(See Fig 13).
Call CEC.
6. Electronic Control Box may need to be replaced
(See Fig 13).
Call CEC.
11
PILOT SPARKS CONTINUOUSLY WITH NO WATER
RUNNING
1. Microswitch needs adjustment
If no water is running, but pilot electrode continuously
sparks, the microswitch screw to the water valve needs
adjustment. See Figure 12.
PILOT LIGHTS BUT BURNERS WILL NOT COME ON
1. Confirm water valve assembly is working properly .
WATER IS NOT HOT ENOUGH
1. Temperature selection too low.
Change the setting. Turn the temperature adjustment knob
clockwise (to the right).
Note: This will decrease the activation flow rate.
2. Water flow through the heater is higher than the
capacity of the AquaStar to heat it
Reduce the flow demand at the faucet. See flow rates at
specific temperature rises on page 2.
2. Confirm the flame sensor is in its proper position.
3. Confirm the burner electrovalve switch is
functioning properly .
Call CEC
4. The electronic Control Box (Fig. 13) may need to
be replaced.
Call CEC.
E661_002
Fig. 13 - Electrical wiring diagram
4 electronic control box
43 pilot electrovalve
51 pilot electrode
52 flame sensor
96 microswitch assembly
99 on/off switch
114 gas control valve
115 burner electrovalve
116 battery compartment
1.5V D batteries (2)
119 overheat sensor
WA TER IS TOO HOT
1. Temperature Selection too high
Turn the temperature adjustment knob counter-clockwise
(to the left) to lower the maximum water temperature.
Note: This will increase the activation flow rate.
2. Inlet water temperature is very warm (60º-75ºF)
Reduce inlet gas supply to lower the heaters degree rise.
Note: Only the Model 125BS should be used if the inlet
water is preheated.
3. Btu input is too low due to insufficient gas pressure
It is extremely important for a tankless
instantaneous water heater to have the right size
gas line to obtain the correct gas pressure
See specifications on page 2. Unlike storage tank water
heaters, the burners of a tankless water heater must be
very powerful to heat water instantaneously since they do
this only at the time hot water is actually being used. It is
therefore imperative that the gas pressure requirement
be met exactly. Insuf ficient gas pressure will directly affect
the water temperature at the time of usage. See page 2
for correct gas pressure settings and fig. 14 for locations
where gas pressures are taken.
4. Btu input is too low due to insufficient gas supply
Make sure your main gas line is fully opened. If using LP
gas, be sure that the size of the propane tank is adequate
to supply the required gas pressure.
5. Cold water is mixing with the hot water between
the AquaStar and the outlet
Compare water temperature at outlet of the AquaStar (hold
the AquaSt ar’s outlet pipe with your hand) and at the tap.
If these two are very different, check for mixing valve or
plumbing crossover (see “NO SPARK AT THE PILOT”
paragraph #4). Where automatic “anti-scald” valves are
required by code, lower the temperature setting on the
AquaStar as much as possible and balance the pressure
between cold and hot water after the AquaStar.
6. Parts in water flow valve are corroded so that the
gas passage is not fully opening.
HOT WATER TEMPERATURE FLUCTUATES / UNIT
DEACTIV ATED
1. Unbalanced pressure in waterlines
The added restriction caused by the Aquastar in the hot
water system can result in uneven pressures between the
cold and the hot. In such cases when mixing cold water at
the tap, the lower hot water pressure may be overpowered
by a much higher cold water pressure, which may cause
the Aquastar burners to shut down (deactivate). Make sure
faucet aerators or shower heads are free of minerals.
Do not add any flow restrictor to the shower head.
T ypically this deactivation symptom is a result of the
hot water being too hot to use comfortably . Warm inlet
water generally causes this. Lowering the control
knob setting and/or reducing the inlet gas supply to
the heater should correct this deactivation symptom.
12
2. Cold water is mixing with the hot water between
the AquaStar and the outlet
See #4 under “NO SP ARK A T THE PILOT”.
3. Inlet water pressure is erratic due to
inadequate supply water pressure or saturated
pressure tank on well system
Check the inlet water pressure. On a private well, raise
minimum pressure setting to 30 psi. Confirm that the
pressure tank is not water logged.
4. Gas pressure is too low
See page 2 and 7 for correct specifications.
Fig. 14 - Diagram of AquaStar 125 X
3
2
5
6
7
8
11
1. Heat exchanger
2. Pilot assembly
3. Burner manifold gas
pressure test nipple
4. Main gas burner
5. Pilot gas tubing
6. Gas valve
7. Electronic control box
8. Battery box
9. on/off switch
10. Temperature adjustment selector
11. Microswitch
12. Gas inlet gas pressure test nipple
13. LED
1
4
9
13
10
12
13
Fig. 15 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST
14
Fig. 15
INTERIOR COMPONENTS DIAGRAM
AND PARTS LIST 125X
1 Front cover ¤ 8 705 421 255
2 T emperature adjustment knob comp. ¤ 8 702 000 219
3 T emperature adjustment knob ¤ 8 702 000 111
4 Water connection gasket ¤ 8 710 103 043
5 Draught diverter ¤ 8 705 505 354
6 Heat exchanger ¤ 8 705 406 235
7 Hot water pipe ¤ 8 700 705 556
8 Washer ¤ 8 710 103 045
9 Overheat sensor (ECO) ¤ 8 707 206 040
10 Cold water pipe ¤ 8 700 705 294
11 Main Burner Assembly NG 8 708 120 298
11 Main Burner Assembly LPG 8 708 120 296
12 Washer for burner assembly ¤ 8 710 103 060
13 Throttle disc LPG 8 700 100 174
14 Gas valve NG 8 707 011 729
14 Gas valve LPG 8 707 011 730
15 Diaphragm switch N G 8 708 504 021
15 Diaphragm switch LPG 8 708 504 049
16 Pilot burner assembly LPG 8 708 105 491
16 Pilot burner assembly NG 8 708 105 337
17 Electrode ignition group ¤ 8 718 107 067
18 Injector pilot NG 8 708 200 069
18 Injector pilot LPG 8 708 200 312
19 Pilot gas tube ¤ 8 700 707 349
20 Washer ¤ 8 700 103 173
21 Electronic control box ¤ 8 707 207 011
22 Battery box ¤ 8 700 505 062
23 Set of cables complete ¤ 8 704 401 035
24 Water valve ¤ 8 707 002 534
25 Water valve repair kit ¤ 8 705 500 076
26 Slow-ignition valve ¤ 8 708 503 063
27 Diaphragm ¤ 8 700 503 053
28 Water inlet filter ¤ 8 700 507 059
29 Selector screw ¤ 8 708 500 251
30 V olumetric water governor ¤ 8 707 402 015
31 V enturi ¤ 8 708 205 249
32 LED Control 8 707 305 001
33 On/Off Switch 8 707 200 014
34 Pilot Electrovalve 8 708 501 249
35 Burner Electrovalve 8 708 501 250
36 Water elbow fitting 8 700 703 114
15
INSTALLATION CHECKLIST
MODEL 125X
GAS LINE SIZE
Natu ral Ga s
Nomin a l Iron Pipe Size* 1/2 " 3/4 " 1"
MAXIMUM LENGTH
10' 40' 150'
Liquid Propane
Semi-rigid T ubing 1/2" 5/8" 3/4" 7/8"
MAXIMUM LENGTH
* Flex tubing greatly reduces capacity and, therefore, is not recommended.
RECO M M E NDE D
NOT
20' 60' 150'
Minimum Vent Size* and Height
Minimum Diameter Minimum Height**
5 inches 6 feet
* NOT E
** NOT E
2 feet above any obs tructionwithin a 10 foot radius of vent pipe. Cons ult y our gas ut ility or National Gas Fuel
Code if ve nt will have elbows or sh are vent ing w ith another appliance. The vent c onnec tor should have as muc h
For installation on well systems, insure that your water pressure is between 30 - 50 psi.
: V ent s ize m us t not be restrict ed. Installation mus t comply with nat ional fuel gas c ode venting
requirem ents for a 117,000 B tu Cat egory I appliance and any applicable local c odes .
: M inimum vent height m us t be 6 feet, provided there are no elbows. Termination of the vent m us t be
vertical rise as pos s ible (minim um 12") before any horizontal run.
Water Pressure
EVLAVRETAWETACIRBUL
EVLAVRETAWDLIUBER
NEERCSRETLIFRETAWTCEPSNI
YLBMESSATOLIPTCEPSNI
YLBMESSATNEVTCEPSNI
RENRUBNIAMTCEPSNI
Replacement Parts available from North American
Distributor
†
†
†
†
CONTROLLED ENERGY CORP.
340 Mad River Park
Waitsfield, Vermont 05673
Phone 800-642-311 1
Fax (802) 496-6924
www.controlledenergy.com
techsupport@controlledenergy.com
01egapeesELBATECNANETNIAM
RAEYYREVESRAEY2YREVESRAEY5-3YREVE
†
†
VULCANO T ermodomésticos S.A.
Estrada de Cacia
3801 - 856 Aveiro - PORTUGAL
Recycled paper
© 2001 Controlled Energy Corporation, Waitsfield, VT
all rights reserved
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