GSW 520H Installation Manual And Owner's Manual
520H Direct Vent Indoor Models
On-Demand Condensing Water Heater
Installation Manual and Owner ’s Guide
520H model
only
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
520H Direct Vent Indoor 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 (10-12)
320577-000
Table of Contents
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SAFETY GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Optional Items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Warning For Installations . . . . . . . . . . . . . . . . . . . . . . . 7
High-altitude Installations . . . . . . . . . . . . . . . . . . . . . . . 7
520H Model Installation . . . . . . . . . . . . . . . . . . . . . . . . 8
Venting Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
General
Exhaust vent (PVC vent)
Exhaust vent (Stainless steel vent)
Vent termination
PVC Venting Illustrations
Stainless steel Venting Illustrations
Vent clearances
Additional clearances
Gas Supply And Gas Pipe Sizing . . . . . . . . . . . . . . . . 14
Measuring inlet gas pressure
Water connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pressure Relief Valve
Condensate Drain
Condensate Drain Connections
Case A: If a neutralizer is not required
Case B: If a neutralizer is required (installing the
Neutralizer assembly)
Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . 17
Remote Controller Connection . . . . . . . . . . . . . . . . . . 18
Pump Control Connection. . . . . . . . . . . . . . . . . . . . . . 18
Pump Control Modes . . . . . . . . . . . . . . . . . . . . . . . . . 19
A) Recirculation Control: No. 5 ON
B) Storage Tank Circulation Control:
No.6 ON
C) Energy Conserving Recirculation:
No.5 and No.6 ON
D) Normal Control (Default setting):
No.5 and No.6 OFF
Easy-link System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
General
Easy-Link Connection Procedures
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Space-Heating Applications . . . . . . . . . . . . . . . . . . . . 23
Recirculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Dual-purpose hot water heating . . . . . . . . . . . . . . . . . 24
INITIAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
OPERATING SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . .26
NORMAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . .28
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Temperature Settings . . . . . . . . . . . . . . . . . . . . . . . . . 28
On The 520H
Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Freeze Protection System. . . . . . . . . . . . . . . . . . . . . . 29
MAINTENANCE AND SERVICE . . . . . . . . . . . . . . . . . . .29
Unit Draining And Filter Cleaning . . . . . . . . . . . . . . . . 29
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Single Unit Installations
Easy-Link System
Fault Analysis Of Error Codes . . . . . . . . . . . . . . . . . . 32
COMPONENTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . .33
Case Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
520H
Computer Board Assembly. . . . . . . . . . . . . . . . . . . . . 33
520H
Burner Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
520H
Water Way Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 34
520H
PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
OUTPUT TEMPERATURE CHART . . . . . . . . . . . . . . . . .37
520H Models
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . .38
2
SPECIFICATIONS
Model 520H
Natural Gas Input
(Operating Range)
Propane Input
(Operating Range)
Gas Connection 3/4" NPT
Water Connections 3/4" NPT
Condensate Drain Port
Connection
Water Pressure 5 - 150 psi*
Natural Gas Inlet
Pressure
Propane Min. Inlet
Pressure
Manifold Pressure of
the 520H
Weight 33.1Kg (73 lbs.)
Dimensions
Ignition Electric Ignition
Supply 120 VAC / 60 Hz
Electric
*40 psi or above is recommended for maximum flow
Min.: 13,000 BTU/h
Max.: 199,000 BTU/h
Min.: 13,000 BTUh
Max.: 199,000 BTU/h
1/2" NPT
Min. 5.0" WC
Max. 10.5" WC
8.0" WC Max.
14.0" WC
Natural: 3.2" WC
Propane: 5.5" WC
H 651mm (25.6 in.) x W
470mm (18.5 in.) x D 315mm
(12.4 in.)
Operating
(520H)
152 W (1.27A)
Standby 8.2 W (0.07A)
Freeze-
Consumption
Protection
207 W (1.73A)
INTRODUCTION
This manual provides information necessary for the
•
installation, operation, and maintenance of the 520H.
The model description is listed on the rating plate which
•
is attached to the side panel 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 520H is an on-demand, tankless water heaters
•
designed to efficiently supply endless hot water for your
needs.
The 520H is a high efficiency model with an in-build sec-
•
ondary heat exchanger that absorbs latent heat from the
exhaust gas.
The principle behind the 520H Water Heater is simple:
•
Intake port
Primary heat
exchanger
Burner
Fan motor
Thermistor
PCB
Exhaust
Secondary heat
exchanger
Thermistor
Bypass valve
Water control
valve
Flow sensor
Thermistor
Gas Valve
NOTE
* 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.
Condensate
Hot Water
Outlet
Cold Water
Inlet
Gas
Inlet
drain port
*This diagram illustrates tankless water heater design concepts only and does not accurately represent to the 520H
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
SAFETY GUIDELINES
Safety Defi nitions
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
General
1. Follow all local codes, or in the absence of local codes,
the most recent edition of CSA B149.1 Natural Gas,
Propane Installation Code.
2. Properly ground the unit in accordance with all local
codes or in the absence of local codes, with CSA standard C22.1 Canadian Electrical Code Part 1.
3. Carefully plan where you intend
to install your 520H 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 (please 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.
Rating plateRating 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. 15
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. 29 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.
• Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter),
otherwise the warranty will be void.
• The installer (licensed professional) is
responsible for the correct installation of
WARNING
PLEASE READ THIS MANUAL CAREFULL Y AND FOLLOW
ALL DIRECTIONS.
your Water Heater and for compliance
with all national, state/provincial, and
local codes.
4
• The warranty will not cover damage
caused by water quality.
• Only potable water or potable water
/ glycol mixtures can be used with
this water heater. Do not introduce
pool or spa water, or any chemically
treated water into the water heater.
• Water hardness levels must not
exceed 7 grains per gallon (120
ppm) for single family domestic
applications or more than 4 grains
per gallon (70 ppm) for all other
CAUTION
WARNING
5
types of applications. Water hardness leads to scale formation and
may affect/damage the water heater.
Hard water scaling must be avoided
or controlled by proper water treatment.
• Water pH levels must be between
6.5 and 8.5
• Well water must be treated.
• Although this water heater 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 520H models are high efficiency products that create condensation.
A condensation drain tube must be
installed with these models to discharge
condensate into a drain outlet. For more
information, refer to pg. 15.
• The manufacturer does not recommend
installing the 520H model in an attic due
to safety issues. If you install your 520H
model in an attic:
• Make sure your unit will have
enough combustion air and proper
ventilation.
• Keep the area around you’re the
water heater clean. When dust collects on the flame sensor, the water
heater will shut down on errors.
• Locate unit for easy access for ser-
vice and maintenance.
• A drain pan, or other means of pro-
tection against water damage, is
required to be installed under the
water heater in case of leaks.
General
1. Follow all local codes, or in the absence of local codes,
the most recent edition of CSA B149.1 Natural Gas,
Propane Installation Code.
2. The manifold gas pressure is preset at the factory. It is
computer controlled and should not need adjustment.
3. Maintain proper space for servicing. Install the unit so
that it can be connected or removed easily. Refer to pg.
7, and pg. 8 for proper clearances.
4. The electrical connection requires a means of disconnection, to terminate power to the water heater for servicing
and safety purposes.
5. If you will be installing the unit in a contaminated area
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.
6. Particles from flour, aerosols, and other contaminants
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.
7. Do not install the unit where the exhaust vent is pointing
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. 12).
Included Accessories
Check that the installation manual, the communication
cable, the product registration card and the PVC adaptor
are included with the unit (the adaptor comes with the 520H
model only).
Items
Manual Qty: 1
Communication Cable (Gray) Qty: 1
Product Registration Card Qty: 1
TH-PA01 PVC adaptor
(520H model only)
For details on how to connect the adaptor, refer to pg.10 &.
11.
Qty: 1
Optional Items
1. Temperature Remote Controller (TM-RE30):
The Temperature Remote Controller has two functions. It allows the output
temperature from the 520H to be adjusted within the range of 38°C to 85°C
(100°F to 185°F), and it also works as a diagnostic tool that will give a concise error code whenever there is a problem with the unit. The temperature
options are 38°C (100°F), 40.5°C (105°F), 43°C (110°F), 46°C (115°F), 49°C
(120°F), 52°C (125°F), 55°C (130°F), 57°C (135°F), 60°C (140°F), 63°C
(145°F), 65.5°C (150°F), 68°C (155°F), 71°C (160°F), 74°C (165°F), 77°C
(170°F), 79.5°C (175°F), 82°C (180°F) and 85°C (185°F). See the trouble
shooting section for information on possible error codes.
2. Pipe cover (TH-PC02):
The Pipe cover protects the plumbing pipes to the 520H models from unex-
pected adjustments. This pipe cover is fixed to the bottom of the water heater, which hides the plumbing and improves the visual aspects of the whole
installation for the water heater.
3. Wall thimble with Termination (TK-KPWL4 and TK-KPWH4):
Louver Termination
TK-KPWL4
Hood Termination
TK-KPWH4
These terminations are used when venting out through the wall and are
compatible with the T-Vent pipe system.
These terminations are special stainless steel vents for gas appliances and
are UL listed as Category II, III and IV. There are two types of terminations:
the Louver termination and the Hood termination. For different wall thicknesses, there are two ranges of lengths available (refer to the venting brochure for details).
Install these vent terminations in accordance with their installation instructions and any applicable local codes.
4. Neutralizer kit (TH-NT01):
The Neutralizer assembly neutralizes the condensate (acidic water) that
forms in the secondary heat exchanger of the 520H models. It connects to
the condensate drain port of the 520H models by using connectors included
with the neutralizer kit. Refer to pg. 16 for the details.
6
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.
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.
•
High-altitude Installations
Check the elevation where your water heater is installed.
Set DIPswitches shown in the table below depending on the
altitude. These DIPswitches (No. 5 and No. 6) are on the
computer board on the left bank only.
Altitude
Switch
No.5
Switch
No.6
0 to 2,500 ft
(default)
OFF ON OFF
OFF OFF ON
ON
The dark squares indicate the direction the DIPswitches
should be set to.
1
2
3
4
5
6
7
8
9
10
2,500 to
4,000 ft
ON
4,000 to
5,000 ft
ON
1
2
3
4
5
6
7
8
9
10
5,000 ft
Consult our
Technical
1
Services
2
Department
3
4
at 1-888-
5
479-8324
6
7
8
9
10
Over
DO NOT
adjust any DIPswitches on the right bank.
Left bank of
DIP switches
7
520H Model Installation
The 520H models are equipped with a thermistor and hi-limit
switch for the exhaust gas, detecting excess temperatures
within the flue and enabling the unit to safely stop operations if needed. These components are always monitoring
exhaust gas conditions in order to prevent heat damage to
PVC (Plastic) venting if PVC is used.
If the exhaust gas temperature exceeds 60°C (140°F), these
components will enable the unit to safely stop operations.
520H model requires a 102mm (4 in.) make-up intake air
•
supply pipe. The intake pipe must be sealed airtight.
Air supply pipe can be made of ABS, PVC, galvanized
•
steel, corrugated stainless steel, or Category lll / IV stainless steel.
In any areas subject to freezing temperatures, the manu-
•
facturer highly recommends an indoor installation with
the 520H model. In such an installation, freezing issues
can only occur if cold air enters through the venting into
the heat exchanger, whether by negative pressures
within the installation location or by strong outside winds.
It is the installer’s responsibility to be aware of these
issues and take all preventative measures. The manufacturer will not be responsible for any damage to the
heat exchanger as a result of freezing. 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. 29 for more information.
Sidewall venting is recommended for the 520H models.
•
Vertical venting (roof termination) is acceptable.
The manufacturer recommends running the exhaust
•
vent and the intake pipe as parallel as possible.
The PVC adaptor is used to make the connection
•
between the 520H vent collar and PVC vent pipe easier
and for maintenance purposes.
Maintain Clearances.
Top 305mm
(12 in.)
Venting Instructions
General
Improper venting of this appliance can
result in excessive levels of carbon monoxide which can result in severe personal
WARNING
The 520H models must be vented in accordance with
the section “Venting of Equipment" of the latest edition of
Section 7 of the CSA B149.1 Natural Gas and Propane
Installation Code as well as applicable local building
codes.
The use of venting materials approved for Category III/IV
appliances is recommended whenever possible. However,
520H may also be vented with plastic pipe materials such
as PVC. For details, please refer to the Exhaust vent (PVC
vent) section below. Vent installations which utilize plastic
vent systems must use venting that complies with ULC
S636.
Exhaust vent (PVC vent)
The 520H models can be connected with PVC venting certified to ULC S636 standards.
The maximum length of exhaust vent piping must not
•
exceed 15.24m (50 ft.) for 102mm (4 in.) venting and
7.6m (25 ft.) for 76mm (3 in.) venting (deducting 5 ft. for
each elbow used in the venting system). Do not use more
than 5 elbows for 102mm (4 in.) venting and 2 elbows for
76mm (3 in.) venting.
When the horizontal vent run exceeds 1.5m (5 ft.), sup-
•
port the vent run at 915mm (3 ft.) intervals with overhead
hangers.
injury or death.
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.
Side
76mm
(3 in.)
Front 76mm
(4 in.) (610mm
(24 in.)
Recommended
for
Maintenance)
Bottom 305mm
(12 in.)
8
Back
13mm
(0.5 in.)
Side
76mm
(3 in.)
Max. Vertical &
Horizontal (Total) Vent
Length
Diameter
76mm
(3 in.)
102mm
(4 in.)
Max. No. of
Elbow
2 7.6m (25 ft.)
5 15.24m (50 ft.)
* For each elbow added, deduct 1.5m (5 ft.) from max.
vent length.
No. of
Elbows
Max. Vertical or Horizontal Length
76mm (3 in.)
venting
102mm (4 in.) venting
0 7.6m (25 ft.) 15.24m (50 ft.)
1 6m (20 ft.) 13.7m (45 ft.)
2 4.5m (15 ft.) 12.2m (40 ft.)
5 N/A 7.6m (25 ft.)
Excludes elbow termination, rain caps, or the 76mm
(3 in) PVC Concentric Termination
For details on the vent connection to the 520H, refer to pg.
10 & 11.
Exhaust vent (Stainless steel vent)
This is a Category IV 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 72°C (160°F).
For best results, a vent system should be as short and
straight as possible.
The 520H is a Category IV appliance and must be vented
•
accordingly with any 102mm (4 in.) vent approved for use
with Category III/IV or Special BH type gas vent.
The manufacturer recommends the “T-Vent" line manu-
•
factured by TAKAGI (Refer to Takagi’s “T-Vent" brochure
for details). However, the following are also UL listed
manufacturers: ProTech Systems Inc. (FasNSeal), Flex-L
Inc., Z-Flex Inc. (Z-Vent III), Metal-Fab Inc., and HeatFab Inc. (Saf- T Vent).
Follow the vent pipe manufacturer’s instructions when
•
installing the vent pipe.
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 / IV
approved or Special BH vent pipe).
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.
When the horizontal vent run exceeds 1.5m (5 ft.), sup-
•
port the vent run at 915mm (3 ft.) intervals with overhead
hangars.
Max. Vertical &
Horizontal (Total) Vent
Length
Diameter
102mm
(4 in.)
Max. No. of
Elbow
5 15.24m (50 ft.)
* For each elbow added, deduct 1.5m (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 (5 ft.)
Vent termination
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 direct-vent terminator is recommended
•
when the water heater is vented through a sidewall.
General rules for venting the 520H water heater are:
1. Place the water heater as close as possible to the vent
terminator.
2. The vent collar of the water heater must be fastened
directly to an unobstructed vent pipe or TH-PA01 adaptor.
3. Do not weld the vent pipe to the water heater collar.
4. Do not cut the vent collar of the unit.
5. The weight of the vent stack must not rest on the water
heater.
6. The vent must be easily removable from the top of the
water heater for normal service and inspection of the
unit.
7. The water heater vent must not be connected to any
other gas appliance or vent stack.
8. Avoid locating the water heater vent terminator near any
air intake devices. These fans can pick up the exhaust
flue products from the water heater and return them to
the building. This can create a health hazard.
9. Avoid using an oversized vent pipe or using extremely
long runs of the pipe.
10. Locate the vent terminator so that it cannot be blocked
by 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.
11. For rooftop venting, a rain cap or other form of termina-
tion that prevents rain water from entering into the water
heater must be installed.
9
PVC Venting Illustrations
Horizontal Installation Diagram (With elbow terminations)
Horizontal Installation Diagram (With 76mm (3 in.) PVC
Concentric Termination)
Vertical Installation Diagram
Fire stop
Wall
Connection between exhaust
vent collar and PVC piping. See
the next page for instructions.
Roof
Roof Flashing
Keep a 25mm (1 in.) clearance between
wall and the intake section of the concentric
termination. See the diagram below.
Concentric
Termination
Wall
25mm (1 in.)
min. clearance
Insert the bird
screen included
with the termination.
Connection between
exhaust vent collar and PVC
piping. See the next page for
instructions.
How to install PVC venting with the 520H (For Exhaust)
1. Connect the TH-PA01 PVC adaptor* directly on the
exhaust vent collar of the water heater.
2. Connect a 102mm (4 in.) PVC coupler (or 4x3" PVC
reducer) to the TH-PA01 PVC adaptor.
3. From the coupler (or reducer), continue on the rest of the
vent run with 102mm (4 in.) PVC pipe (or 76mm (3 in.)
PVC pipe.)
Connection between exhaust
vent collar and PVC piping. See
the next page for instructions.
(For Intake: 102mm (4 in.) only)
Connect a 102mm (4 in.) PVC Straight pipe directly on
1.
the intake vent collar of the water heater.
102mm (4 in.)
PVC straight pipe
102mm (4 in.)
PVC straight pipe
102mm (4 in.)
PVC coupler
TH-PA01 PVC
adaptor*
Exhaust vent collar of
the 520H (Female)
Intake vent collar
* TH-PA01 PVC adaptor
is included with the 520H.
10
(For Intake: 76mm (3 in.) only)
Connect a 102mm (4 in.) PVC Straight pipe directly on
1.
the intake vent collar of the water heater.
Connect a 4x3" PVC reducer to the 102mm (4 in.) PVC
2.
Straight pipe.
From the reducer, continue on the rest of the vent run
3.
with 76mm (3 in.) PVC pipe.
Stainless steel Venting Illustrations
Horizontal Installation Diagram
76mm (3 in.) PVC
straight pipe
4x3" PVC
reducer
1026mm (4 in.)
PVC straight pipe
Intake vent collar
* TH-PA01 PVC adaptor
is included with the 520H.
76mm (3 in.) PVC
straight pipe
4x3" PVC
reducer
TH-PA01 PVC
adaptor*
Exhaust vent collar of
the 520H (Female)
Wall
Vertical Installation Diagram
Roof
Fire stop
Sidewall Vent
Terminator
Rain Cap
Roof Flashing
11
Regarding the clearances from the exhaust terminator to
•
the air inlet or opening, refer to the next few pages.
Follow all vent system manufacturer’s instructions and
•
all local codes.
Do not common vent or connect any vent from other
•
appliances to the 520H water heater vent.
Use 102mm (4 in.) Category III/IV approved or Special
•
BH, single or double wall stainless steel vent pipe.
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 U.S.A
Direct vent and other
than Direct Vent
Direct
vent
Other than
Direct Vent
A Clearance above grade, veranda, porch, deck, or balcony. 1 foot 1 foot 1 foot
4 feet from below or
B Clearance to window or door that may be opened 3 feet 1 foot
side opening. 1 foot
from above opening.
C Clearance to permanently closed window * * *
Vertical clearance to ventilated soffit located above the
D
vent terminator 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
H
meter/regulator assembly
3 feet * *
I Clearance to service regulator vent outlet. 3 feet * *
Clearance to non-mechanical air supply inlet to building or
J
the combustion air inlet to any other application
3 feet 1 foot
4 feet from below or
side opening. 1 foot
from above opening.
K Clearance to mechanical air supply inlet. 6 feet 3 feet 3 feet
Clearance above paved sidewalk or paved driveway
L
located on public property.
7 feet * 7 feet
M Clearance under veranda, porch deck, or balcony. 1 foot * *
* For clearances not specified in CSA-B149.1, please use clearances in accordance with local installation codes and
the requirement of the gas supplier.
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