John Wood 910 User Manual
910 / 910 ASME
On-Demand Water Heater
Installation Manual and Owner ’s Guide
WARNING
- 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 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.
- Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
This product must be installed
and serviced by a licensed
plumber, a licensed gas fitter,
or a professional service tech-
nician. Improper installation
and/or operation, or installation
by an unqualified person, will
void the warranty
Gas Tankless Water Heater
910 / 910 ASME Models
Suitable for potable water heating and space-heating*
* Please refer to local codes for space-heating compliance.
FEATURING
• ENDLESS HOT WATER
• ON-DEMAND USAGE
• COMPACT, SPACE SAVING
• ENERGY CONSERVATION
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
• EASY-LINK SYSTEM
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property dam-
WARNING
age, personal injury or death.
If you have any questions,
please call or write to:
GSW Water Heating
599 Hill Street West
Fergus, ON Canada N1M 2X1
Toll Free: 1-888-479-8324
REV. 00 (11-04)
320579-000
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Combustion Sections Within The 910. . . . . . . . . . . . . . 4
SAFETY GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Warning For Installations . . . . . . . . . . . . . . . . . . . . . . . 6
910 Model Installation. . . . . . . . . . . . . . . . . . . . . . . . . . 6
Combustion Air Supply . . . . . . . . . . . . . . . . . . . . . . . . . 7
Minimum Recommended Air Supply Opening Size For
Water Heater
Combustible Air Supplied By Mechanical Fan Or Make
Up Air Device
Direct Intake Vent System. . . . . . . . . . . . . . . . . . . . . . . 7
Venting Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Exhaust Vent
Vent Termination
Vent Clearances
Gas Supply And Gas Pipe Sizing . . . . . . . . . . . . . . . . 11
Measuring Inlet Gas Pressure
Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Pressure Relief Valve
Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . 13
Remote Controller Connection . . . . . . . . . . . . . . . . . . 13
Pump Connnection . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Pump Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 14
A) No. 4 ON: Recirculation Control
B) No. 5 ON: Storage Tank Circulation Control
C) No. 4 and No. 5 ON: Energy Conserving
Recirculation
D) No. 4 and No. 5 OFF: Normal Control (Default
setting)
Easy-link System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
General
Easy-Link Connection Procedures
Multi-unit System For Large Volumes. . . . . . . . . . . . . 17
Multi-Unit System Connection Diagram
INITIAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
NORMAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . .19
Without Remote Controller
With Remote Controller Installed: TM-RE30 (Optional)
Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Freeze Protection System. . . . . . . . . . . . . . . . . . . . . . 20
Temperature Settings . . . . . . . . . . . . . . . . . . . . . . . . . 21
MAINTENANCE AND SERVICE . . . . . . . . . . . . . . . . . . .22
Unit Draining and Filter Cleaning . . . . . . . . . . . . . . . . 22
GENERAL TROUBLESHOOTING. . . . . . . . . . . . . . . . . .24
Troubleshooting – Error Codes. . . . . . . . . . . . . . . . . . 26
Single Unit
Easy-Link
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
OPERATING SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . .29
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Space Heating Applications . . . . . . . . . . . . . . . . . . . . 31
Re-circulation:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Dual-purpose Hot Water Heating . . . . . . . . . . . . . . . . 32
Additional clearances
Optional Items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
COMPONENTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . .36
Case Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Water Way Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 36
910
910ASME
Computer Board Assembly. . . . . . . . . . . . . . . . . . . . . 37
Burner Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Combustion And Exhaust Assembly. . . . . . . . . . . . . . 39
PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
OUTPUT TEMPERATURE CHART . . . . . . . . . . . . . . . . .42
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . .43
2
SPECIFICATIONS
Model 910
Natural Gas Input
(Operating Range)
Propane Input
(Operating Range)
Gas Connection 1” NPT
Water Connections 1” NPT
Water Pressure 15 - 150 psi*
Natural Gas Inlet
Pressure
Propane Inlet Pressure
Manifold Pressure
Weight 50.8Kg (112 lbs.)
Dimensions
Ignition Electric Ignition
Supply 120 VAC / 60 Hz
Min: 15,000 BTU/h
Max: 380,000 BTU/h
Min: 15,000 BTU/h
Max: 380,000 BTU/h
Min.: 5” WC
Max.: 10.5” WC
Min.: 8” WC
Max:. 14” WC
Natural: 2.8” WC
Propane: 3.8” WC
H 643mm (25.3 in.) ×
W 630mm (24.8 in.) ×
D 300mm (11.8 in.)
Operation 178 W (1.48A)
INTRODUCTION
This manual provides information necessary for the
•
installation, operation, and maintenance of the 910 water
heater.
The model description is listed on the rating plate which
•
is attached to the front cover of the water heater.
Please read all installation instructions completely before
•
installing this product.
If you have any problems or questions regarding this
•
equipment, consult with the manufacturer or its local
representative.
The 910 is an on-demand, tankless water heater designed
•
to efficiently supply endless hot water for your needs.
The 910 has two heat exchangers. The primary and sec-
•
ondary heat exchangers alternate roles, extending the
life of the 910 (see pg. 4).
The principle behind the 910 Water Heater is simple:
•
Exhaust
Heat
exchanger
Heat
exchanger
Electric
Standby 16 W (0.13A)
Freeze-
Protection
Consumption
271 W (2.26A)
*40 psi or above is recommended for maximum flow
NOTE
* All references to the 910 also refer to the 910 ASME
model
* Check the rating plate to ensure 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 obligations.
1. Water control
valve
2. Flow sensor
3. Gas Valve
4. T emperature
sensor
Hot Water
Outlet
Burner
1
2
4
4
Cold Water
Fan
Inlet
1
3
4
Burner
2
Fan
Gas
Inlet
3
4
* This diagram illustrates tankless water heater design concepts only and is not accurate to the 910 physical description.
A hot water tap is turned on.
1.
Water enters the heater.
2.
The water flow sensor detects the water flow.
3.
The computer automatically ignites the burner.
4.
Water circulates through the heat exchanger and then
5.
gets hot.
The computer will modulate the gas supply valve and
6.
water flow to produce the right amount of hot water at the
correct temperature.
When the tap is turned off, the unit shuts down.
7.
3
Combustion Sections Within The 910
SAFETY GUIDELINES
Left combustion
section
Right combustion
section
The 910 contains two combustion sections. The section that
turns on first is whichever section the 910 decides is the
primary section. The moment at which the secondary section fires will depend on the total flow rate and set temperature of the water heater:
Flow rate at which the sec-
ondary section fires in
Set temperature of
the 910 in °C (°F)
l/min (GPM (US))
12 (3.2) 38-49 (100-120)
11 (2.9) 52, 54 (125,130)
9.8 (2.6) 60 (140)
9 (2.4) 63, 65.5 (145,150)
8 (2.1) 68-85 (155-185)
Example:
If the set temperature is 49°C (120ºF):
The section(s) in operation is indicated by the black
square(s).*
Total Flow < 1.9
l/min (0.5 GPM)
(no section fi res)
910 910 910 910
Depending on which side is the primary section
1.9 l/min (0.5 GPM) < Total
Flow < 12 l/min (3.2 GPM)
(only primary section fi res)
OR
Total Flow > 12 l/min
(3.2 GPM)
(both sections fi re)
* The primary and secondary section will reverse roles every
100 firing cycles or every 12 hours of unit operation.
Indicates an imminently hazardous situation which, if not avoided, will result in death
or serious injury.
DANGER
Indicates an imminently hazardous situation which, if not avoided, could result in
death or serious injury.
WARNING
Indicates an imminently hazardous situation which, if not avoided, could result in
minor or moderate injury.
CAUTION
Installation and service must be per-
•
formed by a qualified installer (for example, a licensed plumber or gas fitter),
otherwise the warranty by the manufacturer will be void.
The installer (licensed professional) is
•
WARNING
responsible for the correct installation
of your water heater and for compliance
with all national, state/provincial, and
local codes.
PLEASE READ THIS MANUAL CAREFULL Y AND FOLLOW
ALL DIRECTIONS.
General
1. Follow all local codes, or in the absence of local codes,
follow the most recent edition of CSA B149.1 Natural
Gas and Propane Installation Code.
2. Properly ground the unit in accordance with all local
codes or in the absence of local codes, with CSA stan-
dard C22.1 Canada Electrical Code Part 1.
3. Carefully plan where you intend to install your 910 Water
Heater. Please ensure:
Your water heater will have enough combustible air
•
and proper ventilation.
Locate your heater where water leakage will not
•
damage surrounding areas (refer to pg. 5).
4. Check the rating plate for the correct GAS TYPE,
GAS PRESSURE, WATER PRESSURE and ELECTRIC
RATING.
* If this unit does not match your requirements, do not
install and consult with the manufacturer.
5. If any problem should occur, turn off all hot water taps
and turn off the gas. Then call a trained technician or the
Gas Company or the manufacturer.
4
Rating plate
Water temperatures over 52°C (125°F)
•
can cause severe burns instantly or
death from scalding. The water temperature is set at 49ºC (120ºF) from the
factory to minimize any scalding risk.
Before bathing or showering always
check the water temperature.
Do not store or use gasoline or other
•
flammables, vapors, or liquids in the
vicinity of this appliance.
Do not reverse the water and/or gas
•
connections as this will damage the gas
valves and can cause severe injury or
death. Follow the diagram on pg. 12
when installing your water heater:
Do not use this appliance if any part has
•
WARNING
been in contact with or been immersed
in water. Immediately call a licensed
plumber, a licensed gas fitter, or a professional service technician to inspect
and/or service the unit if necessary.
Do not disconnect the electrical supply if
•
the ambient temperature will drop below
freezing. The Freeze Prevention System
only works if the unit has electrical
power. The warranty will not be covered
if the heat exchanger is damaged due
to freezing. Refer to the section on the
Freeze Protection System on pg. 20 for
more information.
INSTALLATION
All gas water heaters require careful and correct installation
to ensure safe and efficient operation. This manual must be
followed exactly . Read the “Safety Guidelines” section at the
beginning of this manual.
CAUTION
WARNING
The warranty will not cover damage
•
caused by water quality. Water hardness that leads to scale formation and/or
corrosion may affect/damage the water
heater. Hard water scaling and/or corrosion must be avoided or controlled by
proper water treatment.
The manufacturer recommends using
•
the direct-vent kit, when the water heater
is installed in a beauty salon. Some
chemicals used in a beauty salon may
affect the flame sensor. Water heater
may not work properly.
Although the 910 is designed to operate
•
with minimal sound, the manufacturer
does not recommend installing the unit
on a wall adjacent to a bedroom, or a
room that is intended for quiet study or
meditation, etc.
Locate your heater close to a drain
•
where water leakage will not do damage
to surrounding areas. As with any water
heating appliance, the potential for leakage at some time in the life of the product does exist. The manufacturer will not
be responsible for any water damage
that may occur. If you install a drain pan
under the unit, ensure that it will not
restrict the combustion air flow.
The 910 weighs 50.8Kg (112 lbs.).
•
Ensure that any and all support structures (whether it is installed on a wall,
on a support stand, etc.) have enough
strength to support and hold the 910.
When handling the 910, do not place
•
your hands inside the flue collar. Injury
may result.
The manufacturer does not recommend
•
installing unit in an attic due to safety
issues. If you install your 910 in an
attic:
Make sure your unit will have enough
•
combustion air and proper ventilation.
Keep the area around your water heater
•
clean. When dust collects on the flame
sensor, the water heater will shut down
on errors.
If the above conditions cannot be met,
•
use the direct-vent conversion kit TMDV50.
Locate unit for easy access for service
•
and maintenance.
A drain pan is required to be installed
•
under the water heater in case of leaks.
5
General
The manifold gas pressure is preset at the factory. It is
1.
computer controlled and should not need adjustment.
Maintain proper space for servicing. Install the unit so
2.
that it can be connected or removed easily. Refer to pg.
6 for proper clearances.
The electrical connection requires a means of disconnec-
3.
tion, to terminate power to the water heater for servicing
and safety purposes.
If you will be installing the unit in a contaminated area
4.
with a high level of dust, sand, flour, aerosols or other
contaminants/chemicals, they can become airborne and
enter and build up within the fan and burner causing damage to the unit. In those environments (e.g.
residential or commercial laundry facilities, hair salons,
pet salons, chemical plants etc.), please purchase the
optional direct-vent conversion kit and convert the 910 to
a sealed combustion unit. Direct venting allows the 910
to draw fresh intake air from the outside. The warranty
will not cover damage caused to the unit due to installation in a contaminated environment that has not been
converted using the direct-vent conversion kit.
Particles from flour, aerosols, and other contaminants
5.
may clog the air vent or reduce the functions of the rotating fan and cause improper burning of the gas. Regularly
ensure that the area around the unit is dust- or debrisfree; regular maintenance is recommended for these
types of environment.
Do not install the unit where the exhaust vent is pointing
6.
into any opening in a building or where the noise may
disturb your neighbors. Make sure the vent termination
meets the required distance by local code from any
doorway or opening to prevent exhaust from entering a
building (refer to pg. 10).
Included Accessories
Check that the installation manual, the communication
cable, and the product registration card are included with
the unit.
Items
Warning For Installations
FOR YOUR SAFETY, READ
BEFORE INSTALLATION
Do not install the heater
where water, debris or flammable vapors may get into
the flue terminal. This may
cause damage to the heater
and void the warranty.
Do not install next to a dryer
or any source of airborne
debris that can be trapped
inside the combustion
chamber, unless the system
is direct vented.
910 Model Installation
1. Follow all local
codes, or in
the absence of
local codes, follow the most
recent edition
Side
of CSA B149.1
Natural Gas
and Propane
Installation
Code.
2. When installed
indoors, the 910
water heater
shall be located
in an area to
maintain the following minimum
clearances
around the unit:
Side
50mm
50mm
(2 in.)
(2 in.)
Do not have the vent terminal pointing toward any
opening into a building. Do
not locate your heater in a
pit or location where gas
and water can accumulate.
Front 76mm (4 in.)
Front 76mm (4 in.)
(610mm (24 in.)
(610mm (24 in.)
Recommended for
Recommended for
Maintenance)
Maintenance)
Top 305mm
Top 305mm
(12 in.)
(12 in.)
Back
Back
13mm
13mm
(0.5 in.)
(0.5 in.)
Side
Side
50mm
50mm
(2 in.)
(2 in.)
Bottom 305mm
Bottom 305mm
(12 in.)
(12 in.)
Manual Qty: 1
Communication Cable (Gray) Qty: 1
Product Registration Card Qty: 1
6
Maintain Clearances.
Combustion Air Supply
The water heater location must provide enough air for proper
combustion and ventilation of the surrounding area. See the
latest edition of ANSI Standard Z223.1 or any applicable
local codes. In general, these requirements specify that if
the unit is installed in a confined space, there must be a
permanent air supply opening.
Minimum Recommended Air Supply Opening
Size For Water Heater
When drawing
make-up air from
inside the building
(from other
rooms within)
When combustion
air is supplied from
inside the building,
an opening communicating with the
rest of the dwelling should have a
minimum free area
of 6.5cm2 (1 in2) per
1,000 BTUH input of
the total input rating
of water heater in the
enclosed area. This
opening should never
be less than 1284cm2
(199 in2)
Water
heater
size
MAX
380,000
BTU/h
When drawing
make-up air from
outside the
building
164cm2 (25.3 in2) 2452cm2 (380 in2)
When combustion air
is supplied from outside the building, an
opening communicating directly with the
outside should have
a minimum free area
of 6.5cm2 (1 in2) per
15,000 BTUH input
of the total input rating of water heater in
the enclosed area
Direct Intake Vent System
This 910 water heater may be converted to a direct-vent
(sealed combustion) appliance by installing an adapter (Part
No. TM-DV50) which will bring all required combustible air
from outside the building. When installing the direct-vent
conversion kit, please follow all instructions included with
the kit.
The 910 must be installed in a location where the proper
•
amount of combustible air will be available to it at all
times without obstructions.
If used as a direct-vent appliance, the 910 requires a
•
127mm (5 in.) combustible air supply pipe. The intake
pipe must be sealed airtight.
Air supply pipe can be made of ABS, PVC, galvanized
•
steel, corrugated aluminum, corrugated stainless steel or
Category III stainless steel.
Change the DIPswitch settings to the direct-vent system
•
(see diagram below).
Sidewall venting is recommended for the direct-vent
•
system.
The manufacturer recommends running the exhaust vent
•
and the intake pipe parallel.
Upper bank of
DIPswitches
7-Seg LED
Lower bank of
DIPswitches
Combustible Air Supplied By Mechanical Fan Or
Make Up Air Device
The 910 water heater is equipped with a combustible air
sensor that will shut off the unit when inadequate combustible air supply to unit is detected.
If a mechanical fan or make up air device is used to
•
supply air to the water heater or utility room, the installer
should make sure it does not create drafts which could
cause nuisance shutdowns.
If a blower is necessary to provide adequate combustion
•
air to the water heater, the blower and water heater must
be set up so that the water heater cannot fire unless the
blower is operating. Possible methods include the use
of the 910 internal fan control port or the use of external
flow sensors/transmitters and relays.
Make sure power to the unit is turned OFF
before changing the DIPswitch settings.
The dark square is the direction the
DIPswitch should be set to.
ON
ON
TMP1
TMP1
Lower bank of
Lower bank of
DIPswitches (Detail)
DIPswitches (Detail)
TMP3
TMP2
TMP3
TMP2
DIRE
MODE
DIRE
MODE
OUT
OUT
87654321
87654321
MST
P-ALARM
MST
P-ALARM
7
Direct-Vent Conversion Kit
Intake
Louver cover
plates
Direct-vent
conversion kit
Exhaust
Venting Instructions
Improper venting of this appliance can
result in excessive levels of carbon monoxide which can result in severe personal
WARNING
This water heater must be vented in accordance with
the section “Venting of Equipment" of the latest edition
of Section 7 of CSA B149.1 Natural Gas and Propane
Installation Code and all applicable local building codes
.
Exhaust Vent
This is a Category III appliance and must be vented accordingly. The vent system must be sealed air tight. All seams
and joints without gaskets must be sealed with high heat
resistant silicone sealant or UL listed aluminum adhesive tape having a minimum temperature rating of 177°C
(350°F). For best results, a vent system should be as short
and straight as possible.
1. This water heater is a Category III appliance and must be
vented accordingly with any 127mm (5 in.) vent approved
for use with Category III or Special BH type gas vent.
2. The following are UL listed manufacturers: ProTech
Systems Inc. (FasNSeal), Flex-L Inc., Z-Flex Inc. (Z-Vent
III), Metal-Fab Inc., and Heat-Fab Inc. (Saf-T Vent).
3. Follow the vent pipe manufacturer’s instructions when
installing the vent pipe.
4. Do not common vent this appliance with any other vented
appliance (Do not terminate vent into a chimney. If the
vent must go through the chimney, the vent must run all
the way through the chimney with Category III approved
or Special BH vent pipe).
8
injury or death.
5. The maximum length of exhaust vent piping must not
exceed 15.24m (50 ft.) deducting 1.5m (5 ft.) for each
elbow used in the venting system. Do not use more than
5 elbows.
Diameter
Max. No. of
Elbow
Max. Vertical or
Horizontal run in Length
127mm (5 in.) 5 15.24m (50 ft.)
*For each elbow added, deduct 5 ft. from max. Vent length.
No. of
Elbows
Max. Vertical or Horizontal Length
0 15.24m (50 ft.)
1 13.7m (45 ft.)
2 12.2m (40 ft.)
5 7.6m (25 ft.)
6. When the horizontal vent run exceeds 1.5m (5 ft.), support the vent run at 915mm (3 ft.) intervals with overhead
hangars.
7. The manufacturer will not be responsible for any damage
to the water heater caused by condensation from the
vent. For vent runs longer than 1.5m (5 ft.), installation of
a condensate drain is recommended. Install the condensate drain as close to the water heater as possible. For
horizontal runs, slope the vent run back toward the water
heater where the condensate drain is installed at a rate
of 6.4mm (1/4 in.) per 305mm (1 ft.). Refer to pg. 9 for
the diagrams.
When installing the vent system, all applicable national and
local codes must be followed. If you install thimbles, fire
stops or other protective devices and they penetrate any
combustible or noncombustible construction, be sure to follow all applicable national and local codes.
Vent Termination
Horizontal Installation Diagram
Improper installation can cause nausea or
asphyxiation, severe injury or death from
carbon monoxide and flue gases poisoning. Improper installation will void product
WARNING
The vent terminator provides a means of installing vent
•
warranty.
pipe through the building wall and must be located
in accordance with CSA-B149.1 and local applicable
codes.
A proper sidewall vent terminator is recommended when
•
the water heater is vented through a sidewall. If the 910
is converted to a direct-vent unit, a proper sidewall directvent terminator, such as a concentric style terminator, is
to be used.
General rules for venting the 910 water heater are:
Place the water heater as close as possible to the vent
1.
terminator.
The vent collar of the water heater must be fastened
2.
directly to an unobstructed vent pipe.
Do not weld the vent pipe to the water heater collar.
3.
Do not cut the vent collar of the unit.
4.
The weight of the vent stack must not rest on the water
5.
heater.
The vent must be easily removable from the top of the
6.
water heater for normal service and inspection of the
unit.
The water heater vent must not be connected to any
7.
other gas appliance or vent stack.
Avoid locating the water heater vent terminator near any
8.
air intake devices. These fans can pick up the exhaust
flue products from the gas appliance and return them to
the building. This can create a health hazard.
Avoid using an oversized vent pipe or using extremely
9.
long runs of the pipe.
Locate the vent terminator so that it cannot be blocked by
10.
any debris, at any time. Most codes require that the terminator be at least 305mm (12 in.) above grade, but the
installer may determine if it should be higher depending
on the job site condition and applicable codes.
For rooftop venting, a rain cap must be installed.
11.
Vertical
Condensation Drain
(Install according to
local codes)
Sidewall Vent
Terminator
Vent Damper
(Recommended for
freezing weather
conditions: 2°C
(36°F) and below)
Vertical Installation Diagram
Roof
Vertical
Condensation Drain
(Install according to
local codes)
Wall
Rain Cap
Roof Flashing
Vent Damper
(Recommended for
freezing weather
conditions: 2°C
(36°F) and below)
Regarding the clearance from the terminator to the air
•
inlet or opening, refer to the next page.
Install a condensation drain in the venting.
•
Follow the vent system to vent manufacturer’s instruction
•
and local code.
Do not common vent or connect any vent from other
•
appliances to the 910 vent.
Use 127mm (5 in.) category III approved or Special BH,
•
single or double wall stainless steel vent pipe.
9
Vent Clearances
INSIDE CORNER
DETAIL
Vent terminal
Air supply inlet
Area where is not permitted
FIXED
CLOSED
Gas meter / regulator
FIXED
CLOSED
OPERABLE
OPERABLE
Canada
Direct vent and other than Direct Vent
A Clearance above grade, veranda, porch, deck, or balcony. 1 foot 30.5cm
B Clearance to window or door that may be opened 3 feet 91.5cm
C Clearance to permanently closed window *
Vertical clearance to ventilated soffit located above the vent termi-
D
nator within a horizontal distance of 2 feet (61cm) from the center
*
line of the terminator.
E Clearance to unventilated soffit *
F Clearance to outside corner *
G Clearance to inside corner *
Clearance to each side of center line extended above meter/regula-
H
tor assembly
3 feet 91.5cm
I Clearance to service regulator vent outlet. 3 feet 91.5cm
Clearance to non-mechanical air supply inlet to building or the com-
J
bustion air inlet to any other application
3 feet 91.5cm
K Clearance to mechanical air supply inlet. 6 feet 1.8m
Clearance above paved sidewalk or paved driveway
L
located on public property.
7 feet 2.1m
M Clearance under veranda, porch deck, or balcony. 1 foot 30.5cm
* For clearances not specified in CSA-B149.1, please use clearances in accordance with local installation codes and
the requirement of the gas supplier.
10
Gas Supply And Gas Pipe Sizing
TO TURN OFF GAS
TO APPLIANCE
Turn off all electric power to the water heater if service
1.
is to be performed.
Turn the manual gas valve located on the outside of
2.
the unit clockwise 3 to the off position.
Conversion of this unit from natural gas
to propane or vise versa will void all warranty. Contact your local distributor to get
the correct unit for your gas type. The
manufacturer is not liable for any property
WARNING
*Check that the type of gas matches the rating plate first.
1. The minimum and maximum inlet gas pressures are:
Gas type Inlet gas pressure
Natural Gas Min.: 5.0" WC – Max.: 10.5" WC
Propane Gas Min.: 8.0" WC – Max.: 14.0" WC
and/or personal damage resulting from gas
conversions.
Open some of the fixtures that use the highest flow rate
6.
to turn on the 910.
Check the inlet gas pressure. When the 910 is on a
7.
maximum burn, the manometer should read from 5.0”
to 10.5” WC for Natural gas, from 8.0” to 14.0” WC for
Liquid Propane.
Size the gas pipe appropriately to supply
the necessary volume of gas required for
the 910 models (380,000 BTU/h for both
Natural Gas and Liquid Propane) using
CSA B149.1 or local codes. Otherwise, flow
capabilities and output temperatures will be
limited.
Install a manual gas shut-off valve between the 910 and
1.
the gas supply line.
When the gas connections are completed, it is necessary
2.
to perform a gas leak test either by applying soapy water
to all gas fittings and observing for bubbles or by using a
gas leak detection device.
Always purge the gas line of any debris and/or water
3.
before connecting to the gas inlet.
2. Gas pressure below this specified range for the 910
and/or insufficient gas volume will adversely affect performance. These pressures are measured when the 910
is in full operation.
3. Inlet gas pressure must not exceed the above maximum
values; gas pressure above the specified range will
cause dangerous operating conditions and damage to
the unit. Ensure that any and all gas regulators used
are operating properly and are providing gas pressures
within the specified range shown above.
4. Until testing of the main gas line supply pressure is completed, ensure the gas line to the 910 is disconnected to
avoid any damage to the water heater.
Measuring Inlet Gas Pressure
The 910 cannot perform properly without sufficient inlet gas
pressure. Below are instructions on how to check the inlet
gas pressure. THIS IS ONL Y TO BE DONE BY A LICENSED
PROFESSIONAL.
Shut off the manual gas
1.
valve on the supply gas
line.
Open a faucet. The unit
2.
should turn on and the
gas in the gas pipe line
should purge. Leave the
faucet on to keep the
unit running until the unit
shut down due to lack of gas supply . Then shut the faucet
off.
Remove the screw for the pressure port located on the
3.
gas inlet of the 910 shown in the diagram to the right.
Connect the manometer to the pressure port.
4.
Re-open the manual gas valve. Check to see that there
5.
are no gas leaks.
11
Water Connections
FOR YOUR SAFETY, READ
BEFORE OPERATING
Do not use this water heater if any part has been submersed under water. Immediately call a licensed professional to inspect the water heater and to replace any
damaged parts.
All pipes, pipe fittings, valves and other components,
1.
including soldering materials, must be suitable for potable water systems.
A manual shut off valve must be installed on the cold
2.
water inlet to the water heater between the main water
supply line and the 910.
In addition, a manual shut off valve is also recommended
3.
on the hot water outlet of the unit. If the 910 is installed
within, or subjected to, a closed loop water system, a
thermal expansion tank must be installed.
Before installing the water heater, flush the water line
4.
to remove all debris, and after installation is complete,
purge the air from the line. Failure to do so may cause
damage to the heater.
There is a wire mesh filter within the cold inlet to trap
5.
debris from entering your heater. This will need to be
cleaned periodically to maintain optimum flow.
Do not reverse the hot outlet and cold inlet
connections to the 910 Water Heater. This
will not activate the water heater.
CAUTION
Pressure Relief Valve
The 910 has a high-temperature shut-off switch built in as a
standard safety feature (called a Hi-Limit switch) therefore a
“pressure only” relief valve is required.
This unit does not come with an approved pressure relief
1.
valve.
An approved pressure relief valve must be installed on
2.
the hot water outlet.
The pressure relief valve must conform to ANSI Z21.22
3.
or CAN 1-4.4 and installation must follow local code.
The discharge capacity must be at least 380,000 BTU/
4.
h.
The pressure relief valve needs to be rated for a maxi-
5.
mum of 150 psi.
The discharge piping for the pressure relief valve must
6.
be directed so that the hot water cannot splash on anyone or on nearby equipment.
Attach the discharge tube to the pressure relief valve and
7.
run the end of the tube to within 150mm (6 in.) from the
floor. This discharge tube must allow free and complete
drainage without any restrictions.
If the pressure relief valve installed on the 910 discharg-
8.
es periodically, this may be due to a defective thermal
expansion tank or defective pressure relief valve.
The pressure relief valve must be manually operated
9.
periodically to check for correct operation.
When ASME model is installed, the pressure relief valve
10.
should be conformed and installed in accordance with
ASME code.
For the ASME model, the pressure relief valve must
11.
conform to and be installed in accordance with ASME
code.
Hot outlet
Pressure
Relief
Valve
12
Cold inlet
Gas inlet
As close
as possible
Pressure
Relief
Valve
Hot outlet
Cold inlet
Gas inlet
Electrical Connections
Follow the electrical code requirements of
the local authority having jurisdiction. In
the absence of such requirements, follow
the latest edition of CSA C22.1 Canadian
WARNING
CAUTION
1. The heater must be electrically grounded. Do not attach
the ground wire to either the gas or the water piping.
2. The 910 water heater requires 120 VAC / 60 Hz electrical
power supply that is properly grounded.
A proper disconnect (i.e. on/off switch, power plug,
•
etc.) controlling the main power to the 910 must be
provided for service reasons. (Must comply with local
codes).
Connect the power supply to the 910 exactly as
•
shown in the wiring diagram;
3. A green screw is provided in the junction box to ground
the connection.
4. Can be hardwired or wired to a plug-in.
5. The use of a surge protector is recommended in order to
protect the unit from power surges.
Electrical Code, Part 1.
When servicing or replacing parts within the
910, label all wires prior to disconnection to
facilitate an easy and error free reconnection. Wiring errors can cause improper and
dangerous operation. Verify proper operation after servicing.
Remote Controller Connection
Disconnect power supply from the water heater.
1.
Take off the water heater’s front cover.
2.
Find the remote control terminal using the picture below
3.
(located around the lower right-hand side of the water
heater).
Open the plastic cover of the remote controller accessory ,
4.
and then attach the fork terminal to the connector base
of the backside the remote controller accessory with two
screws. Make sure the terminals are firmly fixed.
Put the remote wires through the hole on the bottom of
5.
the unit casing.
Connect the remote wires to the remote controller termi-
6.
nal properly. (No polarity) * Do NOT jump or short-circuit
wires. Computer will be damaged.
Replace Front Cover securely.
7.
Wires used for the remote controller connection must
8.
be:
Minimum 18AWG wire (No polarity)
•
Maximum 400 feet long
•
*For details on the connection to the remote controller accessory, refer to the remote controller’s Installation Manual.
Remote controller terminal inside water heater
Connect Power supply
120 VAC / 60 Hz
Ground
Connect to
these terminals
Front of remote
Connect other end
to this terminal
Back of remote
13
Pump Connnection
The 910 can be used to control a recirculation pump. Proper
pump control helps to preserve the life of the system and
saves energy as well. The water heater pump control port
is a “normally-open” dry contact, and therefore needs additional components to properly control a recirculation pump.
To control the recirculation pump, connect the pump to the
pump terminal in the 910 as shown in the diagram below.
(In a multi- unit system, connect the pump ONLY to the
PARENT unit.) The pump is to be connected using suitable
relays shown in the diagram below (the pump terminal is
essentially only a dry contact. An external power supply and
relays are required to operate the pump). Please make sure
the relays are properly rated for the recirculation pump.
Using the 910 internal thermistors as a temperature control,
the recirculation pump will only turn on when recirculation
is needed.
In a multi-unit system, the pump must be
connected to the "Pump terminal" in the
"PARENT" unit only. If the pump is connected to any of the "CHILD" units, the
pump will not work. These components are
CAUTION
These components are NOT
included with water heaters and
are external to the unit. They
must be acquired separately.
Connect to this terminal.
This is the pump terminal.
NOT included with water heaters and are
external to the unit. They must be acquired
separately.
Power supply for relay
Power supply for pump
120 VAC 220 VAC etc
120 VAC
220 VAC
etc for
relay
Thermal
relay
Recirculation
pump
Pump Control Mode
The 910 provides the four types of the pump control
modes. The pump control modes are selected by changing DIPswitch settings. The DIPswitches are located in the
upper bank of DIPswitches in the lower-left quadrant of the
central computer board in the 910. (See picture below)
Upper bank of DIPswitches
A) No. 4 ON: Recirculation Control
This mode is for providing hot water as soon as possible like
a recirculation usage. The pump is only made to run while
the temperature of the water in the re-circulation loop is not
close to the set temperature of the water heater. The pump
will run for about 1 minute every 30 minutes to determine
whether or not the water temperature in the whole recirculation loop is lower than 5C° (9F°) from the set temperature. If
the water temperature is lower than 5C° (9F°) from the set
temperature, the pump will remain running until the water in
the loop gets up to the set temperature. If not, the pump will
stop for another 30 minutes. If the inlet thermistor senses
that the water temperature is lower than 5C° (9F°) from the
set temperature before those 30 minutes have elapsed, the
pump will activate immediately and remain running until the
water in the loop gets up to the set temperature.
B) No. 5 ON: Storage Tank Circulation Control
The 910 will heat the water 3C° (5.4F°) higher than its set
temperature (unless the 910 is already set at its maximum
temperature of 85°C (185°F)). This is to ensure a higher rate
of recovery for storage tank applications. The circulation
pump (from storage tank to 910) will always remain on.
14
C) No. 4 and No. 5 ON: Energy Conserving
Recirculation
This pump control mode is similar to the “Recirculation
Control mode”. However, once the heat requirement is less
than 7,440 BTU/h, the pump will turn off. The pump will
activate again when the temperature of the system is less
than 35°C (95°F) or after 20 minutes have elapsed from its
previous operation.
*If operating the pump in this mode, insulation is recommended on the water piping.
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