23415 Bock Atm Gas - Bock Water Heaters

23415 Bock Atm Gas - Bock Water Heaters
To the Installer:
To the Consumer:
Please attach these instructions
next to the water heater.
Please read these and all component
instructions and keep for future reference.
Installation and Operation Instructions Manual
High Efficiency Commercial Gas Water Heater
Models: OT200, OT250, OT299
Warranty, Registration Card and Parts List are included.
Owner: Please remember to return the Registration Card!
WARNING: If the information in these instructions is not followed exactly, a
fire or explosion may result causing property damage, personal injury or death.
– Do not store or use gasoline or other flammable
• Immediately call your gas supplier from a neighvapors and liquids in the vicinity of this or any
bor’s phone. Follow the gas supplier’s instructions.
other appliance.
• If you cannot reach your gas supplier, call the fire
– WHAT TO DO IF YOU SMELL GAS
department.
• Do not try to light any appliance.
– Installation and service must be performed by a
• Do not touch any electrical switch; do not use
qualified installer, service agency or the gas supplier.
any phone in your building.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause serious injury or
property damage. Refer to this manual. For
assistance or additional information, consult a
qualified installer or service agency.
WARNING
Install in accordance with all local codes. In the
absence of local codes, refer to NFPA 54 or CSA
B149.1.
CAUTION
The recommended temperature for normal
residential use is 120°F. The dial on the aquastat
does not always reflect the out-coming water
temperature and it could occasionally exceed 120°F.
Variation in out-coming temperature could be
based on factors including but not limited to usage
patterns and type of installation. Test water at the
tap nearest to the water heater. See page 37 for
measuring the out-coming water temperature.
WARNING
Hotter water increases the risk of scald injury.
Before adjusting the water temperature setting,
read this instruction manual. Temperatures at
which injury occurs vary with the person’s age and
the length of exposure. The slower reaction time of
children, elderly or physically or mentally
challenged persons increases the scalding hazard to
them. It is recommended that lower water temperatures be used where these exposure hazards exist.
Households with small children or invalids may
require a temperature setting less than 120°F to
prevent accidental contact with hot water. To
produce less than 120°F, use point-of-use
temperature limiting devices.
23435 EN
If higher water temperature is needed in part of the
water system, automatic temperature limiting
devices must be used on all lines to water taps.
WARNING
Water heater blankets may restrict air flow to the
water heater and cause fire, asphyxiation, personal
injury or death.
THIS MANUAL HAS BEEN PREPARED TO ACQUAINT
YOU WITH THE INSTALLATION, OPERATION, AND
MAINTENANCE OF YOUR WATER HEATER AND TO
PROVIDE IMPORTANT SAFETY INFORMATION.
Read all instructions thoroughly before attempting
installation or operation of your water heater. Keep
these instructions for future reference.
Local plumbing and electrical codes must be
followed in the installation of this water heater. In
the absence of a local code use the UNIFORM
PLUMBING CODE and the NFPA Code. Local codes
may supersede instructions in this installation
manual.
These instructions are a guide for the correct installation of the water heater. The manufacturer will
not be liable for damages caused by failure to
comply with the installation and operating instructions outlined on the following pages.
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.
FAILURE TO FOLLOW THESE INSTRUCTIONS OR ALL
APPLICABLE BUILDING CODES
AND REGULATIONS VOIDS THE WARRANTY ON
THIS WATER HEATER.
Rev2 6/16
IMPORTANT SAFETY INSTRUCTIONS
The proper installation, use and servicing of this water heater is very
important to your safety and the safety of others.
This is the safety alert symbol. Statements following this symbol contain
important safety information. Obey all safety messages that follow this
symbol to avoid possible injury or death.
Important safety information will be preceded by the safety alert
symbol and the words DANGER, WARNING, CAUTION, OR NOTICE.
DANGER indicates an imminently hazardous situation which, if not
avoided, will result in serious injury or death.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in serious injury or death.
CAUTION indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE calls attention to observe a specified procedure.
DANGER
Water heaters utilizing Liquefied Petroleum gas (LP) are different from
natural gas models. A natural gas heater will not function safely on LP gas
and vice versa. To avoid possible equipment damage, personal injury or
fire: DO NOT connect this water heater to a fuel type not in accordance
with the rating label. These units are only certified for a single fuel type.
DANGER
Failure to properly install the vent and combustion air intake system as
outlined in this manual can result in unsafe operation of the water heater.
To avoid the risk of fire, explosion, or asphyxiation from carbon monoxide,
never operate this water heater unless it is properly vented and has
adequate air supply for combustion and dilution of flue gas. Be sure to
inspect the system for proper installation at initial start-up; and at least
annually thereafter. See the Maintenance section for more information.
SAVE THESE INSTRUCTIONS
Page 2
TABLE OF CONTENTS
Section I: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Section II: General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section III: Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Section IV: Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Section V: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Section VI: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Section VII: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Section VIII: Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Section IX: Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Page 3
SECTION I: SPECIFICATIONS
Figure 1: All Models
,
NPT
)
Air
(PV Intak
e
C)
Exh
Ven aust
t (P
VC
Shi
)
LBS pping
(kg Wei
)
ght
T)
Gas
(
(NP
(NP
50.18 62.75
(127) (159)
2"
2"
1"
4"
3"
1,110
(503)
100 199,999 76,000
OT200N-A (378) (58.6) (22.3)
95
98
228
298 67.25 32.00 51.53 11.43
(863) (1,128) (171) (81) (131) (29)
9.43
(24)
50.18 62.75
(127) (159)
2"
2"
1"
4"
3"
1,110
(503)
100 250,000 76,000
(378) (73.3) (22.3)
94
98
282
352 67.25 32.00 51.53 11.43
(1,067)( 1,332) (171) (81) (131) (29)
9.43
(24)
50.18 62.75
(127) (159)
2"
2"
1"
4"
3"
1,110
(503)
100 250,000 76,000
OT250N-A (378) (73.3) (22.3)
94
98
282
352 67.25 32.00 51.53 11.43
( 1,067)(1,332) (171) (81) (131) (29)
9.43
(24)
50.18 62.75
(127) (159)
2"
2"
1"
4"
3"
1,110
(503)
OT299N
100 299,999 76,000
(378) (87.9) (22.3)
93
98
334
404 67.25 32.00 51.53 11.43
(1,264) (1,529) (171) (81) (131) (29)
9.43
(24)
50.18 62.75
(127) (159)
2"
2"
1"
4"
3"
1,110
(503)
OT299N-A
100 299,999 76,000
(378) (87.9) (22.3)
93
98
334
404 67.25 32.00 51.53 11.43
( 1,264)(1,529) (171) (81) (131) (29)
9.43
(24)
50.18 62.75
(127) (159)
2"
2"
1"
4"
3"
1,110
(503)
G
9.43
(24)
F
228
298 67.25 32.00 51.53 11.43
(863) (1,128) (171) (81) (131) (29)
E
98
D
95
C
100 199,999 76,000
(378) (58.6) (22.3)
B
HO
T
LD
DIMENSIONS, INCHES (cm)
T)
CONNECTION SIZES
CO
Rat
Cap ed Sto
acit rage
y, G
AL
Rat
(L)
Inp ed Ma
ut,
xim
Btu
/hr um
Rat
(kW
Inp ed Mi
)
nim
ut,
Btu
um
/
h
The
r (k
W)
(%) rmal E
@ M ffic
i
ax.
e
The
Inp ncy
ut
(%) rmal E
@ M ffic
i
i
e
n. I
Rec
npuncy
t
rise overy
, GA @ 1
L/H 00°F
1st
R (L
/HR
100 Hr. De
)
°F r
live
ise,
ry @
GA
L (L
A
)
Table 1: Dimensions
Model
OT200N
OT250N
NOTE: Suffix "N" stands for NATURAL GAS and suffix "-A" denotes ASME version.
For PROPANE GAS models, change suffix "N" to "LP".
For HIGH ALTITUDE models, the following additional suffixes are defined as:
"-H28" = Approved for altitudes greater than 2,000 up to 7,800 FT
"-H25" = Approved for altitudes greater than 2,000 up to 5,400 FT
"-H58" = Approved for altitudes greater than 5,400 up to 7,800 FT
For natural gas:
MINIMUM GAS SUPPLY PRESSURE (at gas control) = 3.5" W.C. (dynamic)
MAXIMUM GAS SUPPLY PRESSURE (at gas control) = 14" W.C. (static or dynamic)
Page 4
For LP gas:
MINIMUM GAS SUPPLY PRESSURE (at gas control) = 8" W.C. (dynamic)
MAXIMUM GAS SUPPLY PRESSURE (at gas control) = 14" W.C. (static or dynamic)
Note: Dynamic pressure is measured while gas is flowing and static pressure is measured while gas is
not flowing.
All Bock products meet or exceed current ASHRAE standards.
These products are design certified by UL (Underwriters Laboratories) and meet ANSI Z21.10.3 / CSA 4.3
requirements for operation up to 180°F (82°C).
Approved for use as a direct vent automatic storage water heater.
SECTION II: GENERAL INFORMATION
WHEN YOU RECEIVE YOUR NEW WATER HEATER
Check the new equipment to see if all components are in good condition. If damage is
observed or parts appear to be missing, contact your wholesaler.
WATER TREATMENT/FILTRATION
In areas where poor water conditions are suspected (i.e. lime, iron, and other minerals), it is
essential that the water be tested and appropriate action taken to prevent damage to the
water heater and ensure the quality of the water.
TEMPERATURE CONTROL
The water heater is equipped with a main operating control that manages the temperature
regulating and limiting functionality. For domestic hot water, the proper temperature setpoint
is 120°F. For commercial applications, the maximum approved temperature setpoint is 180°F.
Sensors in the top of the tank measure water temperature. The control constantly compares
the sensor values to the temperature setpoint and controls the burner power (on/off) and
modulation accordingly.
The automatic reset, temperature limiting safety function is managed by the main operating
control. In the event that the water temperature becomes excessive (193°F), the control will
shut off all gas to the water heater. The temperature limit safety will automatically reset when
the water temperature drops to below 193°F and normal operation will resume at the next call
for heat.
The temperature setpoint is factory set at 120°F. If hotter water is required a tempering device
or anti-scald device must be installed at the domestic hot water outlet of the heater or at the
point of use. Table 3 details the approximate relationship of water temperature and time with
regard to scald injury. It is important for the user to understand the necessity of tempering or
anti-scald devices when using hotter water in domestic water heating systems.
CAUTION: Hot water in excess of 120°F can cause scalding!
Bock recommends a tempering valve or anti-scald valve be installed and used according to
the manufacturer’s directions to prevent scalding. Many state and local codes now require
installation of these devices. Point of use temperature may be hotter than the setting on the
water heater thermostat. The tempering valve or anti-scald valve will ensure potable
water temperatures at the desired set point with a higher degree of accuracy.
Table 2: Scald Temperature/Time Relationships
APPROXIMATE
TEMPERATURE/TIME
RELATIONSHIPS TO
SCALDING
120°F (49°C)
More than 5 minutes
125°F (52°C)
1 1⁄2 to 2 minutes
130°F (54°C)
About 30 seconds
135°F (57°C)
About 10 seconds
140°F (60°C)
Less than 5 seconds
145°F (63°C)
Less than 3 seconds
150°F (66°C)
About 1 1⁄2 seconds
155°F (68°C)
About 1 second
Page 5
SECTION II: GENERAL INFORMATION
ANODE RODS
The water heater is supplied with a factory installed powered anode system to prevent corrosion of
internal tank components. Specifically, the type of anode system that is used is an impressedcurrent anode system. This system uses a power supply that regulates the protective current output
based on actual conditions inside the tank. The two anode rods in the tank are not consumed over
time and, therefore, do not need to be removed and inspected. Refer to the Maintenance section of
this manual for periodic inspection instructions for the powered anode system.
NOTICE TO THE OWNER: The water heater must be connected to the power supply for the
powered anode system to operate. DO NOT DISCONNECT THE WATER HEATER FROM THE
POWER SUPPLY FOR AN EXTENDED PERIOD OF TIME. WITHOUT POWER, THE ANODE SYSTEM WILL
NOT BE CAPABLE OF PROVIDING CORROSION PROTECTION. When the power switch to the
right of the display is OFF and there is a connection to the power supply, the powered
anode system will still function. If the water heater must be disconnected from the power
supply for an extended period, the tank must be drained. Refill the tank prior to reconnecting the water heater to the power supply.
CAUTION
Hydrogen gas is produced in a hot water system served by the heater that has not been
used for a long period of time (2 weeks or more). Hydrogen gas is extremely flammable.
To reduce the risk of injury under these conditions, it is recommended that a hot water
faucet be opened for several minutes before using any electrical appliance connected
to the hot water system. When hydrogen is present, there will probably be an unusual
sound such as air escaping through the pipe as the water begins to flow. There should be
no smoking or open flame near the faucet at the time it is open.
TEMPERATURE AND PRESSURE RELIEF VALVE (T&P)
CAUTION
To reduce the risk of excessive pressures and temperatures in this water heater, install
temperature and pressure protective equipment required by local codes and no less than
a combination temperature and pressure relief valve certified by a nationally recognized
testing laboratory that maintains periodic inspection of production of listed equipment or
materials, as meeting the requirements for Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems, ANSI Z21.22. This valve must be marked with a
maximum set pressure not to exceed the marked maximum working pressure of the
water heater. Install the valve in an opening provided and marked for this purpose in the
water heater, and orient it or provide tubing so that any discharge from the valve exits
only within 6 inches above, or at any distance below, the structural floor, and does not
contact any live electrical part. The discharge opening must not be blocked or reduced
in size under any circumstances.
CAUTION
Scalding injury and/or water damage can occur from either the manual lifting of the
lever or the normal operation of the T&P valve if it is not piped to a proper drain. If the
valve fails to flow water or reseat, call your plumber.
The T&P valve is factory installed. A discharge drain tube must be installed (responsibility
of the installer) and shall terminate plain, not threaded, 6 inches above the floor drain.
The drain tube material must be approved for temperatures of 120 F or greater and a
Page 6 pressure of 150 PSI or greater.
o
SECTION II: GENERAL INFORMATION
BACKFLOW PREVENTER (CLOSED SYSTEM)
Some local municipal codes and ordinances require the use of these devices on potable
(domestic) water lines. Where backflow preventers, check valves, or pressure regulating valves
are required, it will be necessary to install a thermal expansion tank (designed for use with
potable water) in order to prevent pressure build up in the water heater and associated piping,
which could cause the T&P valve to discharge. Follow the expansion tank manufacturer’s
recommendations when selecting a tank for your hot water system. The expansion tank pressure
shall equal the water heater system pressure prior to initial warm up.
Note: Working pressure of the water heater is 150 PSI. Do not exceed 150 PSI.
CONDENSATION
Condensation of flue gases will occur in the exhaust vent and portions of the heat exchanger
during burner operation. Condensate is considered acidic based on its typical pH range of 3.5 to 3.8
on a scale of 0 to 14 (a pH of 7 is neutral). Some installations may require the use of a condensate
neutralizer kit to reduce the acidity of the condensate prior to it entering the building's drainage
system. When possible, locate a floor drain in close proximity to the water heater to minimize the
length of the drain line. The water heater is supplied with a condensate elbow assembly that must
be installed to the water heater before the exhaust vent is connected. Horizontal sections of the
exhaust vent shall slope upward away from the water heater a minimum of 1/8" per foot. This will
allow the condensate in the vent to run back to the condensate drain on the water heater. In some
instances, condensate may form in the intake piping during periods following burner operation.
Horizontal sections of air intake piping shall slope downward away from the water heater a
minimum of 1/8" per foot. When applicable, if downward sloping is not possible or vertical
sections are used for air intake piping, a condensate drainage tube can be installed on the intake
piping (near the intake pipe connection on the water heater). See Section IV: Installation / Vent
and Combustion Air Intake / Condensate Elbow Assembly and Section IV: Installation / Vent &
Combustion Air Intake / Optional Condensate Line for installation details.
HIGH ALTITUDE
The water heaters covered in this manual are safety certified for altitudes up to 7,800 feet. For
high altitude applications (i.e. installations at altitudes greater than 2,000 feet), models that are
designated with a suffix "-H28", "-H25", or "-H58" must be used. Natural gas models for high
altitude will contain the suffix "-H28" and are certified for use at altitudes greater than 2,000 FT
up to 7,800 FT. LP gas models containing the suffix "-H25" are certified for use at altitudes
greater than 2,000 FT up to 5,400 FT. LP models that contain the suffix "-H58" are certified for
use at altitudes greater than 5,400 FT up to 7,800 FT.
Following installation at high altitudes, verify that O2 readings and CO levels in the exhaust
vent are within the specified ranges given in Section VI: Maintenance, "Check the Combustion
System".
Due to the natural reduction in input rate at higher altitudes, the actual hot water output of the
heater is gradually reduced as altitude is increased. Expect a 2.8% input rate reduction per
1,000 feet altitude. However, all high altitude models are factory adjusted to maintain the
rated sea-level minimum input at minimum fan speed.
Page 7
SECTION II: GENERAL INFORMATION
SEISMIC RESTRAINT
Regions of the United States and Canada that are considered earthquake zones require that the
water heater(s) is properly braced to avoid movement or falling during a seismic event. Bock
recommends a frame and strap system similar to the design shown in Figure 2.
Use heavy gauge metal framing and anchor post bases to the floor. For additional support,
connect framing to wall studs.
Locate the metal straps within the upper and lower third of the tank. The upper strap needs to
run under the plastic control cover. Connect the straps to the metal framing located behind
the water heater(s). Bock recommends the Holdrite Quick Strap® QS-120 or equivalent
strapping system. The Holdrite QS-120 is approved by the California Division State Architect
and is UPC/IPC/IAPMO listed.
>ŽǁĞƌƐƚƌĂƉ
hƉƉĞƌƐƚƌĂƉ
Figure 2: Seismic Straps and Framing
Page 8
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SECTION III: PRE-INSTALLATION
LOCATION
CAUTION
This water heater must be located in an area where leakage of the tank, water line
connections, or the temperature and pressure relief valve will not result in damage to the
area adjacent to the water heater or to lower floors of the structure. When such location
cannot be avoided, a suitable drain pan must be installed under the water heater. The
drain pan depth must be suitable for draining and collecting water. The drain pan can be
purchased from your plumbing professional. The drain pan must be piped to an
adequate drain and all drain piping must be at least 0.75” in diameter and pitched for
proper drainage.
CAUTION
DO NOT store or use gasoline or other flammable, combustible, or corrosive vapors
and/or liquids in the vicinity of the water heater or any other appliance.
IF YOU SMELL GAS:
• DO NOT try to light any appliance.
• DO NOT touch any electric switch; do not use any telephone in your building.
• Immediately call your gas supplier from a telephone in another building. Follow your
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS CORRECTED!
CAUTION
Do not drop water heater or lay heater down on its side. Move the water heater into
position by sliding or using an appropriately sized hand truck.
CAUTION
If the water heater is installed directly on carpeting, the water heater shall be installed
on a metal or wood panel extending beyond the full width and depth of the water
heater by at least 3 inches (76.2 mm) in any direction or, if the water heater is installed
in an alcove, the entire floor shall be covered by the panel. The panel must be strong
enough to carry the weight of the heater when full of water.
Locate the heater so it is not subject to physical damage from moving vehicles or flooding. Do
not locate the water heater in a room where swimming pool chemicals or large quantities of
water softener salt are kept. Installing a water heater in this environment will result in
premature failure of tank and burner components due to corrosion caused by these elements
diffusing into the air.
NOTE: To comply with the installation requirements in NSF Standard 5, the bottom of this
water heater must be sealed to the floor with a silicone based sealant.
The water heater can be installed on combustible or non-combustible flooring. Maintain
clearances specified in this manual and in accordance with the National Fuel Gas Code (NFPA
54, ANSI Z223.1) unless otherwise directed by state and local code requirements. Locate the
water heater such that plastic vent pipe lengths and the number of connection fittings are
minimized. Adequate downward pitch is required on the condensate line for proper drainage.
See Section IV: Installation / Vent & Combustion Air Intake / Condensate Elbow Assembly for
details. If pitch is insufficient and the use of a low profile condensate pump is not feasible, the
heater needs to be placed on a concrete slab to increase the distance between the condensate
line connection and the floor.
Page 9
SECTION III: PRE-INSTALLATION
Minimum clearance from combustible material is 0" for the sides, top, and back of this water
heater, as shown in Figure 3. This water heater is approved for installation in an alcove with
the clearances shown in Figure 3. For ease of access and proper maintenance, the clearances in
Figure 4 are required.
Figure 3: Minimum Clearance From Combustibles
Figure 4: Required Minimum Access Clearances
GAS SUPPLY LINE
Prior to installation, contact your local gas utility to confirm that sufficient gas service is available
for the water heater. The gas meter must have adequate capacity to supply the rated maximum gas
input of the water heater in addition to other gas fired equipment connected to the meter.
Minimum Gas Supply Pressure
The gas supply must be capable of maintaining a minimum pressure at the inlet of the gas control
during water heater operation at maximum input. The pressure will be lowest at the gas control
during water heater operation (i.e. gas is flowing) at maximum input. For natural gas models,
during operation at maximum input, the supply pressure at the gas control must be at least 3.5"
W.C. For LP gas models, during operation at maximum input, the supply pressure at the gas control
must be at least 8” W.C.
Refer to Table 3 for gas supply line sizing. The table shows maximum input in thousands of BTU's
per hour for various pipe sizes and lengths. The table assumes gas supply pressures of 14" W.C. or
less and a pressure drop of 0.3" W.C.
Table 3: Gas Supply Line Capacity
Nominal Internal
Iron Pipe Diameter
Size
(inches) (inches)
3/4
.824
Length of Pipe (feet)
10
20
30
40
50
60
70
80
90
100
125
150
175
200
278
190
152
130
115
105
96
90
84
79
72
64
59
55
1
1.049
520
350
285
245
215
195
180
170
160
150
130
120
110
100
1 1/4
1.380
1,050
730
590
500
440
400
370
350
320
305
275
250
225
210
1 1/2
1.610
1,600
1,100
890
760
670
610
560
530
490
460
410
380
350
320
2
2.067
3,050
2,100
1,650
1,450
1,270
1,150
1,050
990
930
870
780
710
650
610
At minimum, use 3/4" gas supply pipe for models OT200 and OT250.
For model OT299, use a minimum of 1" pipe.
Maximum Gas Supply Pressure
The gas supply pressure shall never be greater than 14" W.C. Pressures greater than 14" W.C. may
damage the gas control which could cause a fire or explosion.
Refer to Section IV: Installation / Gas Connections for further installation instructions.
Page 10
SECTION III: PRE-INSTALLATION
COMBUSTION AND VENTILATION AIR
The water heater can be installed to utilize combustion air from either inside or outside the
building. Refer to "Section IV: Installation" for detailed venting specifications. If indoor air is
used for combustion air it is imperative that the room has an adequate air supply. Inadequate
air supplies may lead to unsafe levels of carbon monoxide (CO) and excessive levels of soot.
See NFPA 54 or the discussions of "Unconfined Space" and "Confined Space" below. In
addition, poor ventilation will also result in hot spots around the heater. Temperatures over
90°F near the water heater generally indicate a lack of ventilation.
UNCONFINED SPACE
Unconfined space is defined by NFPA 54 as a space with a volume greater than 50 cubic feet
(during typical use) per 1000 BTUH of the total combined input of all fuel burning appliances
in the space. Rooms leading directly to the installation space through doors that cannot be
closed can be considered part of the space. Exception: Buildings with full vapor barriers, tight
doors and windows or air infiltration rates of less than 0.35 air changes per hour will be
considered a confined space and require additional air supplies.
CONFINED SPACE
Confined space is defined by NFPA 54 as a space with a volume less than 50 cubic feet (during
typical use) per 1000 BTUH of the total combined input of all fuel burning appliances in the
space. Buildings or rooms of unusually tight construction are also considered a confined
space. See “Unconfined Space: Exception”.
When installing fuel burning appliances in a confined space, air must be supplied to that
space from either inside or outside of the building as conditions allow.
A. Inside Air Supply: A confined space shall be provided with two permanent openings; one
within 12 inches of the top and one within 12 inches of the bottom of the enclosure. These
openings shall lead directly to room(s) of sufficient volume so that the combined volume of
all the space meets the criteria for unconfined space. Each opening shall have a minimum free
area of 1 square inch per 1000 Btu/hr of the combined total input of all fuel burning
appliances in the space. Each opening shall have an area of not less than 100 square inches or
a minimum dimension of not less than 3 inches.
B. Outside Air Supply: Confined spaces shall be provided with two permanent openings; one
within 12 inches of the top and one within 12 inches of the bottom of the enclosure. These
openings shall communicate directly, or by ducts, with the outdoors or spaces that
communicate with the outdoors.
1.) Leading directly to the outside or through vertical ducts: Each opening shall have a
minimum free area of one square inch per 4000 Btu/hr of total input rating of all equipment
in the enclosure.
2.) Leading to outside through horizontal ducts: Each opening shall have a minimum free
area of one square inch per 2000 Btu/hr of total input rating of all equipment in the enclosure.
Note: All ducts shall have the same cross sectional area as the free area of each opening to
which they connect. The minimum dimensions of all ducts shall not be less than three inches.
Powered combustion air supplies are also commercially available and may be used.
LOUVERS & GRILLES
In calculating the free area of an opening, consideration must be given to the blocking effects
of louvers or grilles protecting the opening. Any screens used must be no finer than 1⁄4 inch
mesh. If the free area of a louver or grille is known, this should be used in calculating the size
of opening required. If free area is unknown, it may be assumed that wood louvers will have
20 to 25% free area and metal louvers and grilles will have 60 to 75% free area. Louvers and
grilles should be fixed in the open position or interlocked with the equipment so that they
open automatically during equipment operation.
Page 11
SECTION IV: INSTALLATION
VENT & COMBUSTION AIR INTAKE
DANGER
Failure to properly install the vent and combustion air intake system as outlined in this
manual can result in unsafe operation of the water heater. To avoid the risk of fire,
explosion, or asphyxiation from carbon monoxide, never operate this water heater
unless it is properly vented and has adequate air supply for combustion. Be sure to
inspect the system for proper installation at initial start-up; and at least annually
thereafter. See the Maintenance section for more information.
The water heater venting and combustion air intake can be installed as a power direct
vent system (combustion air from outside the building) or power vent system
(combustion air from inside the building). Vertical or horizontal (side-wall) configurations may be used.
Note: If air from inside the building will be used for combustion air, the requirements in Section III, "Unconfined Space" must be met.
The water heater is supplied with a pre-assembled PVC condensate assembly that must be
installed to the exhaust pipe prior to connection of the exhaust venting. See instructions
in Section IV: Installation / Vent & Combustion Air Intake / Condensate Elbow Assembly.
For the air intake side, a 3" and 4" PVC 90 deg. standard bend elbow is supplied and must
be used as the termination fitting for either a direct vent or power vent system. Use the
elbow size that matches the diameter of the pipe used for the vent system. When using 3"
PVC, use the supplied 4" x 3" reducer to adapt the 3" pipe (field supplied) to the 4" pipe
(supplied on the water heater). Depending on total equivalent vent length, a 3" PVC pipe
system may require use of the supplied restrictor plate on the intake terminal. See the
note under Table 4 for more information.
Both of the supplied intake termination elbows include a protective screen to block
foreign debris or small animals from entering the pipe. If a screen is preferred at the
exhaust termination, it must have a low resistance to airflow. Refer to the type of screen
used in the supplied elbow. A screen that significantly restricts airflow will reduce the
performance of the water heater and could cause nuisance control lockouts.
Prior to connecting intake piping to the water heater, look down the end of the air intake
assembly (see Item 6, page 47) to make sure damper is oriented such that the pins on
opposing sides of the swinging gate are level. If not, adjust orientation of the air intake
assembly by loosening the flexible coupling from the blower and turning the intake
assembly until the pins are level.
All vent length measurements specified in this manual are in addition to the preassembled piping and supplied assemblies and fittings. Equivalent pipe lengths shall not
be greater than the maximum lengths (or less than minimums) given in Tables 4 and 5.
See the notes under Tables 4 and 5 for additional information pertaining to direct vent or
power vent system lengths.
Note: DO NOT connect the water heater to an existing vent or chimney. It must
be vented separately from all other appliances.
The following materials are approved for use as the vent and combustion air intake piping:
• PVC (DWV, ASTM-D2665 or CSA B181.2)
• PVC (Schedule 40, ASTM-D1785 or CSA B137.3)
• PVC (SDR Series, ASTM-D2241 or CSA B137.3)
• CPVC (Schedule 40, ASTM-F441 or CSA B137.3)
• CPVC (SDR Series, ASTM-F442)
• ABS (Schedule 40, DWV, ASTM-D2661 or CSA B181.1)
In Canada, check local codes to ensure that SDR series is approved for use. SDR is
not approved for all installations in Canada.
Page 12
SECTION IV: INSTALLATION
The following materials are approved for use for the fittings in the vent and combustion
air intake systems:
• PVC (Schedule 40 DWV, ASTM D2665)
• CPVC (Schedule 40, ASTM F438)
• ABS (Schedule 40 DWV, ASTM D2661)
Please contact Bock Water Heaters for questions regarding materials that are not listed
above.
NOTICE
Installations in Canada must conform to the requirements of CSA B149 code. Plastic
vent systems must be assembled with pipe, fittings, cements, and primers listed to ULC
S636. Components of this listed system shall not be interchanged with other vent
systems or unlisted pipe/fittings. In Canada, the primer and cement must be of the
same manufacturer as the vent system; do not mix primers and cements from one
manufacturer with a vent system from a different manufacturer. The supplied plastic
pipe/fittings are certified as part of the water heater.
Minimum and Maximum System Lengths
The water heater should be located such that plastic vent pipe lengths and the number of
connection fittings are minimized. Minimum and maximum equivalent pipe lengths for the
vent and combustion air intake systems are given in Tables 4 and 5. Either 3 in. or 4 in. plastic
piping may be used. The water heater is provided with a 4" male PVC connection on the air
intake side and a 3" female PVC connection for the exhaust vent. When piping a 3" vent
system, connect the supplied 4" x 3" reducer to the 4" PVC connection on the water heater.
Alternatively, if a 4" vent system is required, use the supplied 4" x 3" reducer to adapt to the
condensate assembly on the exhaust side." DO NOT use less than 3 in. diameter plastic
pipe and DO NOT use unequal sizes except to increase or decrease size at the point of
connection to the water heater. Figure 5 shows the proper connections to adapt the air
intake for 3” piping.
Figure 5: Adapting Air Intake for 3" Piping
NOTE: The equivalent straight pipe length of a 90°, 1/4 standard bend elbow and
a 45°, 1/8 standard bend elbow is 5 feet and 2.5 feet, respectively. DO NOT use
short bend elbows.
NOTE: An elbow used as an exhaust vent termination fitting must be included
when determining the total number of elbows.
Page 13
SECTION IV: INSTALLATION
Table 4: Minimum and Maximum Vent and Air Intake Pipe Lengths (3" Pipe)
Model(s)
Fuel
Type
OT200, OT250, NAT or
OT299
LP
Vent
Arrangement
Minimum Equivalent Pipe Maximum Equivalent Pipe
Length (per pipe run)
Length (per pipe run)
Air Intake1 (ft)
Vent2 (ft)
Air Intake1 (ft)
Vent2 (ft)
Direct Vent
15
15
50†
50†
Power Vent
0
15
0
100
1
Equivalent length is measured between the 4" pipe connection on the water heater and the
required 90° elbow termination fitting.
2 Equivalent length is measured after the point of connection to the condensate assembly and
includes the termination fitting (if used).
† Shown as a balanced system. Vent length may exceed air intake length if total combined length
does not exceed 100 ft.
Intake length cannot exceed exhaust length.
IMPORTANT! - The supplied restrictor plate must be installed to the supplied 90° elbow
termination when using 3” pipe if total equivalent vent length is less than 60 feet when
using natural gas or 40 feet when using LP.
Table 5: Minimum and Maximum Vent and Air Intake Pipe Lengths (4" Pipe)
Model(s)
Fuel
Type
OT200, OT250, NAT or
OT299
3
LP
Vent
Arrangement
Minimum Equivalent Pipe Maximum Equivalent Pipe
Length (per pipe run)
Length (per pipe run)
Air Intake3 (ft)
Vent4 (ft)
Air Intake3 (ft)
Vent4 (ft)
Direct Vent
50
50
120‡
120‡
Power Vent
0
50
0
240
Equivalent length is measured between the 4" pipe connection on the water heater and the
required 90° elbow termination fitting.
4 Equivalent length is measured after the point of connection to the condensate assembly and
includes the termination fitting (if used).
‡ Shown as a balanced system. Vent length may exceed air intake length if total combined length
does not exceed 240 ft.
Intake length cannot exceed exhaust length.
Page 14
SECTION IV: INSTALLATION
The vent and combustion air intake systems must be sufficiently supported along
vertical and horizontal sections. At minimum, it is recommended that a support is placed
along the vent or air intake piping every 4 feet. For horizontal systems, the first support shall
be located immediately adjacent to the first 90-deg. elbow following the vertical section
connected to the water heater. The support method should act to isolate the vent and
combustion air intake piping from floor joists or other structural members to reduce transmission of noise and vibration.
NOTE: Do not support, pin, or secure the vent and combustion air intake pipe in a
way that restricts the normal thermal expansion and contraction of the venting
material.
For replacement installations, thoroughly inspect the existing vent and combustion air intake
systems prior to installing the new water heater. The following steps shall be taken to properly
inspect the existing vent system:
• Verify that the materials as specified in this manual have been used.
• Verify the maximum and minimum vent and combustion air intake equivalent lengths and
terminal clearances meet the specifications in this manual.
• Inspect the vent and combustion air intake systems for cracking. Pay close attention to joints
between elbows and straight pipe.
• Inspect the system for misalignment of components. This may lead to sagging and unwanted
stresses in the joints.
If any corrections are required they must be computed before installing the replacement water
heater.
Condensate Elbow Assembly
Prior to connecting the exhaust vent pipe, the condensate elbow assembly (supplied, but
not factory installed) must be connected to the exhaust pipe on the water heater.
The free end of the 3 x 3 x 1.5 PVC reducing tee slip fits over the 3" exhaust pipe on the
water heater. For maximum durability and sealing, use a high heat silicone sealant
appropriate for direct vent appliances (rated for at least 150° F). Apply a bead of silicone
around the inside of the free end of the reducing tee. Do the same around the end of the
exhaust pipe on the heater. Push the end of the reducing tee onto the exhaust pipe as far
as the tee allows. The orientation of the condensate elbow assembly is critical for
proper venting of gas and drainage of condensate. See Figure 6 for proper final
orientation of the assembly.
Figure 6: Condensate Elbow Assembly Installation
Page 15
SECTION IV: INSTALLATION
After the assembly is properly mounted to the exhaust pipe, apply more silicone caulk
between the PVC fitting and metal exhaust pipe. Caulk all the way around the pipe. If a
proper seal is not made, combustion gas will leak into the room and condensate will
collect on the floor.
The condensate trap/drain portion of the assembly is shown in Figure 6. This section
includes a 1/2" hose barb fitting for attachment of a flexible condensate hose and a 3/4"
threaded plug that can be removed for cleaning the trap. The condensate drain line must
slope down, 1/8" per foot, away from the water heater towards the drain. If there is
insufficient clearance between the condensate line connection on the water heater to
maintain downward pitch to the drain, the heater may need to be installed above the
floor on a concrete slab or use a low profile condensate pump to facilitate drainage.
If flexible tubing is not acceptable for the condensate drain line, a rigid line assembled
from PVC Schedule 40 can be used. The supplied 1/2" hose barb fitting shall be disconnected and replaced with a 1/2" NPT end x 1/2" socket end adapter. The rigid line shall be
braced with floor mounted standoffs every three feet. Maintain a downward pitch of 1/8"
per foot to the drain.
Some installations require the use of a condensate neutralizer kit to reduce the acidity of
the condensate prior to reaching the drain. Figure 7 shows the connection of a condensate
line to a neutralizer. It is recommended that a low profile condensate pump is installed
between the heater and the neutralizer to facilitate flow through the neutralizer. For
further installation details, refer to the instructions provided with the pump and
neutralizer.
Figure 7: Condensate Pump and Neutralizer
Before connecting the vent piping to the condensate elbow assembly, the condensate trap
must be primed with water. Fill the trap to the point where water starts to flow down the
condensate drain line. See Figure 6 for the minimum fill level for priming the trap.
DANGER
Failure to prime the condensate trap with water will result in combustion gas (which
may contain carbon monoxide) entering the room. To avoid the risk of asphyxiation
from carbon monoxide, never operate the water heater unless the condensate trap is
sealed with water.
Page 16
SECTION IV: INSTALLATION
Horizontal Venting, Direct Vent 2-pipe termination
This water heater may be vented horizontally (through a sidewall) with a two-pipe
termination. Two holes through an exterior wall are required for the vent and
combustion air intake pipes. Minimum clearances between the terminals must be met as
specified in Figure 9. All clearances must comply with local codes or the latest edition of
NFPA 54/ANSI Z223.1 or CSA B149. See Figure 8 and Table 9 for terminal clearances.
Figure 8: Terminal Clearances
Page 17
SECTION IV: INSTALLATION
Table 8: Direct Vent Terminal Clearances
Canadian Installations1
US Installations2
12 inches (30 cm)
12 inches (30 cm)
36 inches (91 cm)
12 inches (30 cm)
*
*
*
*
E = Clearance to unventilated soffit
*
*
F = Clearance to outside corner
*
*
G = Clearance to inside corner
*
*
A = Clearance above grade, veranda,
porch, deck, or balcony
B = Clearance to window or door that
may be opened
C = Clearance to permanently closed
window
D = Vertical clearance to ventilated
soffit located above the terminal within
a horizontal distance of 2 feet (61 cm)
from the centerline of the terminal
H = Clearance to each side of centerline 3 feet (91 cm) within a height 15 feet
extended above meter/regulator
above the meter/regulator assembly
assembly
I = Clearance to service regulator vent
3 feet (91 cm)
outlet
J = Clearance to non-mechanical air
supply inlet to building or the
36 inches (91 cm)
combustion air inlet to any other
appliance
K = Clearance to a mechanical air
6 feet (1.83 m)
supply inlet
L = Clearance above paved sidewalk or
paved driveway located on public
7 feet (2.13 m)†
property
M = Clearance under veranda, porch,
12 inches (30 cm)†
deck, or balcony
*
*
12 inches (30 cm)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
*
*
†
1 In
accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
Permitted
only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
†
2
†
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
In addition to the clearances specified, the following items shall be accounted for during
installation:
• Do not terminate near soffit vents or crawl space or other area where condensate or
vapor could create a nuisance hazard or cause property damage.
• Do not locate the exhaust vent terminal where condensate or vapor could cause damage
or could be detrimental to the operation of regulators, relief valves, or other equipment.
• Do not locate the exhaust vent terminal over public area or walkways where condensate
or vapor can cause nuisance or hazard.
• Do not locate the vent terminal in proximity to plants/shrubs.
• The vent and air intake shall terminate a minimum of 12" (25.4 cm) above expected
snowfall level to prevent blockage.
• It is best practice to locate the intake and exhaust terminations on a common plane.
CAUTION
Never install air intake terminal above vent (exhaust) terminal.
Page 18
SECTION IV: INSTALLATION
Install piping through the wall as shown in Figure 9. Adequate length of pipe must protrude
beyond the exterior wall for attachment of the termination fitting. The recommended distance
between the terminal fitting and the exterior wall is 1 in. (2.5 cm). Directions for cementing joints
(such as the terminal fittings to the straight pipe) can be found on page 25. A 90° elbow is supplied
with the water heater for the termination fitting on the air intake. If other fittings are required
they must be purchased separately. The supplied 90° elbow contains a protective screen to block
foreign debris or small animals from entering the pipe. If a screen is preferred at the exhaust
termination, it must have a low resistance to airflow. Refer to the type of screen used in the
supplied elbow. A screen that significantly restricts airflow will reduce the performance of the
water heater and could cause nuisance control lockouts. Complete the installation of the
remainder of the vent and air intake system and attach to the water heater as shown in Figure 10.
Horizontal sections of the exhaust vent shall slope upward away from the water heater a minimum
of 1/8" per foot (10 mm per meter). This will allow the condensate in the vent to run back to the
condensate drain on the water heater. Horizontal sections of air intake piping shall slope
downward away from the water heater a minimum of 1/8" per foot.
NOTE: If the air intake and exhaust vent terminations will be located on a side of the building
that is frequently subjected to high winds, it is recommended that the air intake termination is
located 24” (center-to-center) below the exhaust vent termination.
CAUTION
Annular spaces around vent pipe wall penetrations shall be permanently sealed using
approved materials to prevent entry of combustion products into the building.
Figure 9: Horizontal Venting, 2-pipe termination
Figure 10: Horizontal Direct Vent Arrangement
Page 19
SECTION IV: INSTALLATION
Horizontal Venting, Power Vent 1-pipe termination
This water heater may be vented horizontally (through a sidewall) with a one-pipe
termination. In this case, the water heater will be utilizing air from inside the building for
combustion air. A single hole through the exterior of the building is required for the vent
pipe.
Note: If air from inside the building will be used for combustion air, the requirements in Section III, “Unconfined Space” must be met.
All clearances must comply with local codes or the latest edition of NFPA 54/ANSI Z223.1
or CSA B149. See Figure 11 and Table 9 for vent terminal clearances.
Figure 11: Terminal Clearances
Page 20
SECTION IV: INSTALLATION
Table 9: Power Vent Terminal Clearances
Canadian Installations1
US Installations2
A = Clearance above grade, veranda,
porch, deck, or balcony
12 inches (30 cm)
12 inches (30 cm)
B = Clearance to window or door that
may be opened
36 inches (91 cm)
4 feet (1.2 m) below or to side
of opening; 1 foot (300 mm)
above opening
C = Clearance to permanently closed
window
*
*
D = Vertical clearance to ventilated
soffit located above the terminal within
a horizontal distance of 2 feet (61 cm)
from the centerline of the terminal
*
*
E = Clearance to unventilated soffit
*
*
F = Clearance to outside corner
*
*
G = Clearance to inside corner
*
*
H = Clearance to each side of centerline 3 feet (91 cm) within a height 15 feet
extended above meter/regulator
above the meter/regulator assembly
assembly
*
I = Clearance to service regulator vent
outlet
3 feet (91 cm)
*
36 inches (91 cm)
4 feet (1.2 m) below or to side
of opening; 1 foot (300 mm)
above opening
6 feet (1.83 m)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
7 feet (2.13 m)†
*
M = Clearance under veranda, porch,
deck, or balcony
1 In
2
12 inches (30 cm) †
†
J = Clearance to non-mechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
K = Clearance to a mechanical air
supply inlet
L = Clearance above paved sidewalk or
paved driveway located on public
property
*
accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
† Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
†
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
In addition to the clearances specified, the following items shall be accounted for during
installation:
• Do not terminate near soffit vents or crawl space or other area where condensate or
vapor could create a nuisance hazard or cause property damage.
• Do not locate the exhaust vent terminal where condensate or vapor could cause damage
or could be detrimental to the operation of regulators, relief valves, or other equipment.
• Do not locate the exhaust vent terminal over public area or walkways where condensate
or vapor can cause nuisance or hazard.
• Do not locate the vent terminal in proximity to plants/shrubs.
• The vent and air intake shall terminate a minimum of 12" (25.4 cm) above expected
snowfall level to prevent blockage.
CAUTION
Never install air intake terminal above vent (exhaust) terminal.
Page 21
SECTION IV: INSTALLATION
Install piping through the wall as shown in Figure 12. Adequate length of pipe must protrude
beyond the exterior wall for attachment of the termination fitting. The recommended distance
between the terminal fitting and the exterior wall is 1 in. (2.5 cm). Directions for cementing joints
(such as the terminal fittings to the straight pipe) can be found on page 25. A 90° elbow is supplied
with the water heater for the termination fitting on the air intake. If other fittings are required
they must be purchased separately. The supplied 90° elbow contains a protective screen to block
foreign debris or small animals from entering the pipe. If a screen is preferred at the exhaust
termination, it must have a low resistance to air flow. Refer to the type of screen used in the
supplied elbow. A screen that significantly restricts airflow will reduce the performance of the
water heater and could cause nuisance control lockouts. Complete the installation of the
remainder of the vent and air intake system and attach to the water heater as shown in Figure 13.
Horizontal sections of the exhaust vent shall slope upward away from the water heater a minimum
of 1/8" per foot (10 mm per meter). This will allow the condensate in the vent to run back to the
condensate drain on the water heater. Horizontal sections of air intake piping shall slope
downward away from the water heater a minimum of 1/8" per foot.
! CAUTION
䊱
Annular spaces around vent pipe wall penetrations shall be permanently sealed using
approved materials to prevent entry of combustion products into the building.
Outside of
Building
Inside of
Building
Vent Pipe
Vent Terminal
From
Water
Heater
Wall
12" (30 cm)
or greater
Ground Level
Wall Section View
Figure 12: Horizontal Venting, 1-pipe termination
F
Page 22
Figure 13: Horizontal Power Vent Arrangement
SECTION IV: INSTALLATION
Vertical Venting, Direct Vent 2-pipe termination
This water heater may be vented vertically (through a roof) with a two-pipe termination. Two
holes through the roof are required for the vent and combustion air intake pipes. All
clearances must comply with local codes or the latest edition of NFPA 54/ANSI Z223.1 or CSA
B149. As a basic guide, the following minimum clearances shall be used:
• Minimum 12 inches (30 cm) above roof.
• Minimum 12 inches (30 cm) above anticipated snow level.
• Maximum 24 inches (61 cm) above roof level without additional support for vent.
• 4 feet (1.2 m) from any gable, dormer or other roof structure with building interior access
(e.g. vent or window).
• 10 feet (3 m) from any forced air inlet to the building. Any fresh or make-up air inlet such as
a dryer or furnace area is considered to be a forced air inlet.
• Minimum 24 inches (61 cm) between the vent and combustion air intake terminal
centerlines.
Note: It is best practice to locate the intake and exhaust terminations on a common plane.
Figure 14: Vertical Venting, 2-pipe termination
CAUTION
Never install air intake terminal above vent (exhaust) terminal.
Install piping through the roof as shown in Figure 14. Adequate length of pipe must protrude
beyond the exterior of the roof (see dimension Y). Directions for cementing joints (such as the
terminal fittings to the straight pipe) can be found on page 25. Two 90° elbows are recommended
for the intake and exhaust terminations to reduce the risk of rain, snow, or foreign objects entering
the system. Complete the installation of the remainder of the vent and air intake system and
attach to the water heater. Piping must be sufficiently supported. At minimum, it is recommended
that a support is placed along the vent or air intake piping every 4 feet.
Page 23
SECTION IV: INSTALLATION
CAUTION
Annular spaces around vent pipe wall penetrations shall be permanently sealed using
approved materials to prevent entry of combustion products into the building.
Figure 15: Vertical Direct Vent Arrangement
Vertical Venting, Power Vent 1-pipe termination
This water heater may be vented vertically (through a roof) with a one-pipe termination.
In this case, the water heater will be utilizing air from inside the building for combustion
air. A single hole through the roof of the building is required for the vent pipe.
Note: If air from inside the building will be used for combustion air, the requirements in Section III, “Unconfined Space” must be met.
All clearances must comply with local codes or the latest edition of NFPA 54/ANSI Z223.1
or CSA B149. As a basic guide, the following minimum clearances shall be used:
• Minimum 12 inches (30 cm) above roof.
• Minimum 12 inches (30 cm) above anticipated snow level.
• Maximum 24 inches (61 cm) above roof level without additional support for vent.
• 4 feet (1.2 m) from any gable, dormer or other roof structure with building interior
access (e.g. vent or window).
• 10 feet (3 m) from any forced air inlet to the building. Any fresh or make-up air inlet
such as a dryer or furnace area is considered to be a forced air inlet.
Page 24
SECTION IV: INSTALLATION
Vent
Terminal
Dim Y
Dim Y Requirements
1) Minimum 12 in. (30 cm) above roof
(US). Minimum 18 in. (46 cm) above
roof (Canada).
Support
Bracket
From
Water
Heater
2) Minimum 12 in. (30 cm) above
anticipated snow level (US). Minimum
18 in. (46 cm) above anticipated snow
level (Canada).
3) Maximum 24 in. (61 cm) above roof
without additional support.
Figure 16: Vertical Venting, 1-pipe termination
F
Install piping through the roof as shown in Figure 16. Adequate length of pipe must protrude
beyond the exterior of the roof (see dimension Y). Directions for cementing joints (such as the
terminal fittings to the straight pipe) can be found on page 25. Two 90° elbows are
recommended for the exhaust termination to reduce the risk of rain, snow, or foreign objects
entering the system. Complete the installation of the remainder of the vent system and attach
to the water heater. Piping must be sufficiently supported. At minimum, it is recommended
that a support is placed along the vent piping every 4 feet.
Figure 17: Vertical Power Vent Arrangement
Page 25
SECTION IV: INSTALLATION
Assembling Vent and Air Intake Joints
WARNING
Cements and primers are highly flammable. Assemble joints in an adequately
ventilated area away from heat sources or open flames. Do not smoke.
Read cautions and warnings on material containers.
CAUTION
DO NOT use cement that is lumpy or thick. DO NOT thin cement.
Connections (i.e. joints) between plastic pipe and fittings must be properly sealed. This
requires that an appropriate primer (cleaner) and cement (solvent) are used for the type of
material (PVC, CPVC, ABS) that is used in the venting system. For PVC use ASTM D2564
grade cement, for CPVC use ASTM F493 grade cement, and for ABS use ASTM D2235 grade
cement. The following steps should be taken when connecting plastic pipe and fittings:
• Cut pipe square with hand saw and remove burrs from inside and outside edges.
• Clean fitting socket and pipe joint area of all dirt, grease, or moisture.
• Check dry fit. Pipe should easily go 1/3 of the way into the fitting socket.
• Liberally apply primer to inside of fitting socket and pipe joint area.
• Over the wet primer, apply a medium coat of cement to the fitting socket and pipe joint
area.
• Insert pipe into fitting with a slight twisting motion. Ensure that the pipe is bottomed
into the fitting.
• Hold pipe and fitting for 30 seconds to prevent push off.
• Wipe off excess cement. Cure time may be at least 2 hours for Ø4" pipe at 60°F. Longer
cure time is required for larger diameter pipe and/or lower temperatures.
Note: The vent and combustion air intake pipe/fittings must overlap a minimum
of 1/2 inch (1.3 cm) at each joint. DO NOT drill or punch holes in the plastic pipe
or fittings.
Optional Condensate Drain
If downward sloping (away from water heater) of the air intake piping is not possible or a
vertical direct vent arrangement is used, an optional condensate drain can be installed in
the air intake piping to prevent buildup of condensate in the air intake during standby
periods. Follow these steps to properly install the drain line:
• Turn off all electrical power to the water heater.
• Drill a 3/8" diameter mounting hole through the bottom of the 4" PVC pipe (section of
pipe shown in Figure 18). Make sure the hole is located at the absolute lowest point on
Page 26
SECTION IV: INSTALLATION
the horizontal pipe.
Figure 18: Optional Condensate Drain on Air Intake Piping
• Tighten a 1/8" NPT stainless steel hose barb fitting into the hole in the PVC pipe. The
hose barb should be adaptable to 1/4" ID plastic tubing.
• Connect 1/4" ID plastic tubing to the hose barb.
• Form a trap by looping a portion of the plastic tube into a circle. Secure the loop in
place with a plastic zip tie.
• Route the plastic tubing to an appropriate floor drain. Use a condensate neutralizer if
necessary.
• Prime the loop trap with water prior to resuming operation of the water heater.
Disconnect the end of the tube that was connected to the hose barb. With the free end
above the loop trap, pour water into the tube until the loop is filled halfway.
• Reconnect the tube to the hose barb and turn on electrical power to the water heater.
DANGER
Failure to prime the condensate drain loop with water will result in combustion gas
(which may contain carbon monoxide) entering the room. To avoid the risk of
asphyxiation from carbon monoxide, never operate the water heater unless the
condensate drain loop is sealed with water.
Page 27
SECTION IV: INSTALLATION
WATER CONNECTIONS
CAUTION
This water heater incorporates fittings that contain a nonmetallic lining. DO NOT apply
heat to these fittings when making sweat connections to the heater. Sweat tubing to
an adapter before securing adapter to any fittings on water heaters.
ALL PIPING SHOULD CONFORM TO LOCAL CODES AND ORDINANCES. It is highly
recommended that unions and shut-off valves are installed at the potable water connections
to allow for isolation and/or movement during service. All piping should be adequately
insulated with an approved material to minimize heat loss.
Piping diagrams are provided in Figures 20 - 23 for a variety of configurations.
POTABLE WATER CONNECTIONS
IMPORTANT: THE WATER HEATER MUST BE FILLED WITH WATER BEFORE
CONNECTING ELECTRIC POWER.
1) Close the main water supply valve before continuing with the installation. After the main
water supply is shut-off, relieve the water line pressure by opening a faucet. Once the pressure
has been relieved, close the faucet. The “Cold” and “Hot” potable water connections are
labeled on the water heater. Install a union and shut-off valve at both potable water
connections. A tempering valve or anti-scald valve should be installed at the potable water
outlet and used according to the manufacturer’s specifications to prevent scalding.
IMPORTANT: The water heater contains factory installed pipe
nipples at the hot outlet connections. These pipes were
tightened to proper orientation at the factory. DO NOT ROTATE
THESE PIPES WHEN CONNECTING FITTINGS IN THE FIELD.
The black indicator line on the side of the factory installed pipe
nipple must be in line with the arrow on the label shown in
Figure 19. If orientation is not correct there will be a reduction
in water heater performance.
Figure 19: Hot Outlet Pipe
Nipple Orientation
2) If a backflow preventer, check valve, or pressure regulating valve is required in the cold
water supply, a properly sized expansion tank must be installed to control thermal expansion.
Do not operate the water heater in a closed system without installing a thermal expansion
tank. Follow the expansion tank manufacturer’s recommendations when selecting a tank for
your system.
3) Following installation of the water lines, open the main water supply valve and fill the
water heater. Open several hot water faucets to relieve air from the system. After water is
flowing through the faucets and the system is void of air, close the faucets and check for water
leaks in the system.
Note: Do not try to heat hard water as this will drastically reduce heater life. Install a water
softener or other scale reducing water treatment system if the water heater is being installed in
a hard water area (water hardness higher than seven grains).
Page 28
SECTION IV: INSTALLATION
Figure 20: Piping Diagram One Unit
Figure 21: Piping Diagram Two Units
Page 29
SECTION IV: INSTALLATION
Figure 22: Piping Diagram Three Units
Figure 23: Piping Diagram One Unit with Storage Tank
Page 30
SECTION IV: INSTALLATION
WATER (POTABLE) HEATING AND SPACE HEATING CONNECTIONS
If this heater is used for water (potable) heating and space heating, the following requirements apply:
- Piping and components to the water heater for the space heating application must be
suitable for use with potable water.
- Toxic chemicals, such as used for boiler treatment, shall not be introduced into the
potable water used for space heating.
- A water heater which will be used to supply potable water shall not be connected to any
heating system or component(s) previously used with a non-potable water heating
appliance.
- If the space heating requires water at a temperature higher than required for other uses,
a tempering valve shall be installed to reduce the water temperature for those uses in
order to lessen scald hazard potential.
- This water heater cannot be used for space heating applications only.
- Space heating piping connections shall be made to the free Hot/Cold connections on the
water heater. Two sets of Hot/Cold connections are supplied.
A piping diagram for water (potable) heating and space heating is shown in
Figure 24.
Figure 24: Piping Diagram One Unit with Space Heating
Page 31
SECTION IV: INSTALLATION
GAS CONNECTIONS
CAUTION
Do not use this water heater with any gas other than the type listed on the rating label.
Check the rating label on the front of the water heater and make sure the gas to be
used matches the gas stated on the rating label. Consult your local gas company or
Bock Water Heaters with any questions.
A manual valve, union,
and a sediment trap shall
be provided in front of the
gas valve. All gas piping
must conform to local
codes and/or the National
Fuel Gas Code ANSI
223.1/NFPA 54 or CSA
B149.1. Figure 25 shows
the installation of a
sediment trap to the gas
piping on the water
heater.
Regulated Gas Supply Line
Main Gas Shutoff Valve
Union
Tee
Sediment Trap
Pipe Cap
Figure 25: Gas Piping with Sediment Trap
The gas supply piping to the
heater must be sized such that the pressure at the valve is sufficient when all other appliances
are operating. Undersized gas piping will reduce water heater performance and result in
nuisance lockouts. Refer to Section III: Pre-Installation / Gas Supply Line for pipe size requirements.
Verify that the gas service and meter are sized properly for the total load. If the gas supply
pressure is greater than 14" W.C., the water heater must have a supply gas regulator installed
in the gas supply line for each water heater. The regulator must be rated at or above the input
rating (Btu/hr) of the water heater that it serves. Inlet and outlet connections on the regulator
shall not be less than the minimum gas supply line size for the water heater. The Maxitrol
325-7 (1-1/4", 1-1/2") or 325-5 (3/4", 1") series of regulators is recommended.
For ease of measurement, install a tee with a pipe fitting and a manual shutoff valve between
the main manual shut-off valve to the water heater and the pressure regulator. The pipe fitting
should be adaptable to a pressure gauge for measuring incoming gas pressure. If further
measurement of gas pressure is required due to lack of adequate pressure, measurement at the
inlet of the gas control is recommended. Refer to Section III: Pre-Installation / Gas Supply Line
for minimum pressure requirements.
During pressure testing of the gas supply piping, close the manual gas shut-off valve to the
water heater. Test pressure shall not exceed 1⁄2 PSIG (14" W.C). The gas control is only rated for
1
⁄2 PSIG. To test at a pressure greater than 1⁄2 PSIG, close the manual shut-off valve and
disconnect the gas control. Turn on gas and inspect piping for leaks by "painting" each joint
with a soapy water solution and check for bubbles.
WARNING
DO NOT use an open flame to check for leaks. Serious injury or death could result from
fire or explosion.
The pipe thread compound that is used on gas piping must be of the type resistant to
propane gas. Do not use teflon tape on gas piping.
Page 32
SECTION IV: INSTALLATION
WIRING
All electrical wiring and connections must be in accordance with local codes. In the absence
of local codes, wiring must conform to the National Electric Code ANSI/NFPA No. 70 or the
Canadian Electrical Code C22.1. This water heater must be electrically grounded. Electrical
power should be supplied through a fused disconnect switch located near the water heater.
Where local codes permit, use the supplied power cord for field connection. A grounding
receptacle is required. If local codes do not permit the use of the supplied cord, disconnect the
power cord from the junction box and replace with suitable power supply (120V, 60 Hz)
wiring and connections. The water heater draws less than 5 amps (maximum). Check for
proper polarity at the main power connection prior to operating the water heater.
CAUTION
Turn off or disconnect the electrical power supply to the water heater before servicing.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper operation (including limits and
safeties) after servicing.
Component and schematic wiring diagrams are shown in Figures 26 and 27.
Figure 26: Component Wiring Diagram
Page 33
SECTION IV: INSTALLATION
Figure 27: Schematic Wiring Diagram
Page 34
SECTION V: OPERATION
FOR YOUR SAFETY READ BEFORE OPERATING
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 does not have a pilot. It is equipped
with an ignition device which automatically lights
the burner. Do not try to light the burner by hand.
B.
BEFORE OPERATING 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.
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.
C.
The gas control on this appliance does not
have an “On/Off” knob. Turn off main power
to the water heater to disable the gas control.
D.
Do not use this appliance if any part has been
under water. Immediately call a qualified
installer or service agency to replace a flooded
water heater. Do not attempt to repair the unit!
It must be replaced!
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above
on this label.
2. Set the main power switch, located to the
right of the control display, to the OFF position.
3. This appliance is equipped with a device which
automatically lights the burner. DO NOT TRY
TO LIGHT THE BURNER BY HAND.
4. Wait five (5) minutes to clear out any gas. If
you smell gas STOP! Follow “B” in the safety
information above on this label. If you don’t
smell gas, go to the next step.
5. Set the main power switch to the ON position.
6. If the appliance will not operate, follow the
instructions “TO TURN OFF GAS TO APPLIANCE”
and call your service technician or gas supplier.
7. Set the thermostat to the desired setting.
CAUTION: Hotter water increases the risk of
scald injury. Consult the manual before changing
the temperature setting.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to the lowest setting.
2. Set the main power switch to the OFF postion.
Figure 28: Instructions To Put The Water Heater In Operation
Page 35
SECTION V: OPERATION
SEQUENCE OF OPERATION
Figure 29 gives a step-by-step description of the sequence of
optiTHERM
Sequence
of Operation
operations for
this water heater.
See Troubleshooting section of
this manual for solutions to error codes.
Is a request for
heat present?
NO
YES
Blower is energized to
pre-purge speed
Automatic reset
Control is
manually
reset by
pressing the
“i” button
NO
Does air proving
switch close
within 60
seconds?
NO
Blower is de-energized
and error message is
displayed on control
Has this error
occurred 3 times during
the call for heat?
YES
YES
Blower remains energized for
pre-purge period (5 sec)
Control goes into
lockout requiring
manual reset
Igniter is energized for
warm-up period (20 sec)
Gas valve is opened and igniter
remains energized for 3 seconds
Is flame detected
within 5 seconds?
NO
YES
Has ignition failed 3
consecutive times?
YES
Blower is de-energized
and control goes into
lockout requiring manual
reset
Gas valve is closed and
blower goes to post-purge
speed for 25 seconds
NO
Burner remains on and
modulates based on
sensor value vs. setpoint
YES
Is the gas
pressure switch
still closed?
NO
Gas valve is closed and
blower goes to post-purge
speed for 25 seconds
Has this error
occurred 3 times
in the last 10
minutes?
YES
Are the blocked
vent switches
closed?
NO
Control goes into blocking error
until air/gas pressure switch
closes again (auto reset)
NO
Gas supply pressure rises
above 6.0" W.C. or air
switch closes and clears
blocking error
YES
Is flame signal
still present?
NO
Has flame signal been
lost 10 times during one
call for heat?
YES
YES
NO
NO
Is the call for
heat satisfied?
YES
Gas valve is closed and blower
goes to post-purge speed for 25
seconds
Figure 29: Sequence of Operation
Page 36
Blower is de-energized and
system goes to standby mode
SECTION V: OPERATION
ADJUSTING THE CONTROLS
The temperature setpoint has been adjusted to 120°F at the factory. Allow the water heater to
warm up to the factory adjusted setpoint and wait until the main operating control has shut
off gas to the burner. Wait 30 seconds following shut-off of gas, then adjust the setpoint to a
higher temperature.
Figure 30: Steps to Adjust the Setpoint Temperature
Page 37
SECTION V: OPERATION
Following adjustment of the setpoint to a higher temperature (see Figure 30), the main burner
should relight. Next, adjust the setpoint to a lower temperature (i.e. back to 120° F) and the gas
valve will close, extinguishing the burner flame. The thermostat should be adjusted to the
minimum setting that will meet the hot water needs of the application.
CAUTION
There is a scald potential if the thermostat is set too high. The recommended
temperature setting for normal residential use is 120°F. If higher temperature settings are
needed for combined appliance applications or commercial use, an automatic
tempering valve must be installed on all domestic hot water lines.
MEASURING THE POINT-OF-USE WATER TEMPERATURE
The thermostat is factory set at 120°F for domestic use. It is the responsibility of the building
owner to verify that the installer follows the recommended quantitative testing for measuring
the point-of-use water temperature. To make sure that the system works properly after installation and in the future, it is recommended that the heater’s performance be measured and
monitored. Run water out of a faucet nearest the heater until it comes out warm. Using a
calibrated thermometer, take a measurement. If the water is not at a suitable temperature for
the application, adjust the setting on the control or the tempering valve.
This log (or a similar one) should be filled out as follows:
Date
Page 38
Time
Person running test
Setpoint Temperature °F
Faucet Temperature °F
SECTION VI: MAINTENANCE
NOTICE TO THE OWNER: If you are having a mechanical problem with your water
heater, contact your service company or installer.
The required maintenance schedule for this water heater is shown in Table 10. Further detail is
given in this section for each component.
Table 10: Maintenace Schedule
Component
Operation
Interval
Required
Water piping
Check for leaks
Annually
Repair when necessary
T&P Relief Valve
Verify operation
Annually
Proper operation
Powered Anode System
Check status LED
3 months
Verify "green" LED status
Tank
Sediment removal
6 months
Flush tank
Vent System
Inspect
Annually
Terminations are clear; joints
are sealed; proper support
Condensate Trap
Inspect
6 months
Remove sediment
Combustion System
Measurements
Annually
Check inlet gas pressure; take
combustion reading (O2%)
WATER PIPING
On an annual basis, all piping should be checked for leakage at joints, shut-off valves, and unions.
T&P RELIEF VALVE
On an annual basis, the temperature and pressure relief valve should be checked for proper
operation. First, attach a drain line to the valve to direct the water discharge to an open drain.
This is very important because the temperature of the discharge could be very hot. Second, lift
lever at the end of the valve several times. The valve should operate freely and return to its
original position properly. If water does not flow out of the valve, remove and inspect for
corrosion or obstructions. Replace with a new valve if necessary. Do not repair the faulty valve
as this may cause improper operation.
ANODE RODS
The water heater is supplied with a factory installed powered anode system to prevent corrosion
of internal tank components. The two anode rods in the tank are made from titanium and are
not consumed over time and, therefore, do not need to be removed and inspected.
The powered anode module and status LED are mounted on the control panel underneath the
control enclosure cover. The status LED is located on the right side of the panel. When the
tank is filled with water and the heater is connected to the power supply, the status LED will
be green. If the LED is flashing red, this indicates a system error. Refer to Table 14 in Section
VII: Troubleshooting for possible causes and remedies when the LED is flashing red. Check the
status LED every three months to ensure proper operation.
NOTICE TO THE OWNER: The water heater must be connected to the power supply for the
powered anode system to operate. DO NOT DISCONNECT THE WATER HEATER FROM THE
POWER SUPPLY FOR AN EXTENDED PERIOD OF TIME. WITHOUT POWER, THE ANODE SYSTEM
WILL NOT BE CAPABLE OF PROVIDING CORROSION PROTECTION. When the power switch to
the right of the display is OFF and there is a connection to the power supply, the powered
anode system will still function. If the water heater must be disconnected from the power
supply for an extended period, the tank must be drained. Refill the tank prior to
reconnecting the water heater to the power supply.
Page 39
SECTION VI: MAINTENANCE
FLUSH THE TANK
Elements in the water such as lime and iron may accumulate in the heater. Accumulation of
these elements can keep your water heater from operating at peak efficiency and may lead to
premature tank failure. It is recommended that the tank is drained and flushed thoroughly
twice a year to prevent buildup.
CHECK THE COMBUSTION SYSTEM
On an annual basis, verify that the combustion system is operating within acceptable
parameters. Gas pressures and combustion measurements can be used to verify proper
operation.
• Check the inlet gas pressure to the gas control. The pressure should be greater than 3.5" W.C.
(natural gas) and 8” W.C. (LP gas) when the burner is operating at high fire. Gas pressure
shall not exceed 14" W.C. when the burner is off.
• Measure the products of combustion in the exhaust vent. At maximum input, the % O2 in
the exhaust gas should be in the range of 3.0 - 4.5%. CO should be less than 25 ppm. If
measurements are not within range, contact Bock Technical Support for adjustment
instructions.
• If the combustion readings are outside of the specified ranges, check the manifold pressure
on the gas control at the outlet pressure tap. See Figure 31 for the location of this pressure
tap on the gas control. At maximum input and minimum vent lengths with 4" pipe, the
manifold pressures for each model are given in Table 11.
Table 11: Manifold Pressures
Model(s)
OT200N(-A)
OT200N(-A)-H28
OT200LP(-A)
OT200LP(-A)-H25
OT200LP(-A)-H58
Approved Altitude Range (ft)
0-2,000
2,000-7,800
0-2,000
2,000-5,400
5,400-7,800
Manifold Pressure (in. W.C.)
-0.9
-0.8
-0.6
-0.6
-0.6
OT250N(-A)
OT250N(-A)-H28
OT250LP(-A)
OT250LP(-A)-H25
OT250LP(-A)-H58
0-2,000
2,000-7,800
0-2,000
2,000-5,400
5,400-7,800
-1.1
-1.1
-0.9
-0.9
-0.8
OT299N(-A)
OT299N(-A)-H28
OT299LP(-A)
OT299LP(-A)-H25
OT299LP(-A)-H58
0-2,000
2,000-7,800
0-2,000
2,000-5,400
5,400-7,800
-1.6
-1.4
-1.1
-1.1
-1.1
Contact Bock Technical Support if the measured manifold pressure varies by +/- 0.5" W.C. or
greater from the specified value.
OUTLET (MANIFOLD) PRESSURE TAP BOSS
OUTLET SIDE
Page 40
INLET PRESSURE TAP BOSS
INLET SIDE
Figure 31: Honeywell Gas Control (Top View)
SECTION VI: MAINTENANCE
INSPECT THE VENTING SYSTEM AND BURNER
The vent and combustion air intake system should be checked at least once a year for damage
and blockage. Make sure all joints are secure and that the system is properly supported.
Inspect the outdoor terminals to make sure they are free of obstructions.
Inspect the condensate elbow assembly for blockage every six months. Remove the 3/4" plug
at the end of the trap and pull out any accumulation of sediment. Refer to Figure 6 in Section
IV: Installation / Condensate Elbow Assembly for location of the 3/4" plug. Be careful to not
rotate any portion of the condensate elbow assembly when removing or tightening the plug.
Changing the orientation of the condensate drainage point with the exhaust pipe on the
water heater may adversely effect water heater operation.
CAUTION
For your safety, removal of the blower assembly and the burner must be performed by a
qualified service technician. All parts must be replaced to their original position prior to
operating the water heater.
The water heater utilizes a forced draft combustion system to draw combustion air to the
burner and remove exhaust gas from the vent. The combustion air intake is under a negative
pressure which may cause unwanted objects to be pulled into the intake vent pipe. Over time,
these objects may collect in the burner and affect burner ignitions and water heater
performance. While not required as a periodic maintenance item, inspecting the burner for
blockage should be done once all other potential causes for ignition failures have been
checked (i.e. the ignitor, flame rod, gas supply pressure, etc.). In order to inspect the burner, a
portion of the overall assembly must be removed for access. Before proceeding, make sure
the power switch is OFF and close the main shut-off valve on the gas supply.
• First, remove the ignitor and flame rod and set aside.
• Second, disconnect the wiring harnesses and the air intake piping from the blower.
• Third, remove the blower, along with other connected components, by removing four screws
at the gas control plus four nuts and washers at the burner mounting flange.
Refer to Figure 32 for a visual location of components.
Page 41
Figure 32: Removing the blower for burner inspection
With the blower disassembled from the burner assembly, lift the burner straight up and
through the burner assembly mounting flange. Carefully set aside all gaskets when
disassembling the burner assembly. The gaskets must be used when reassembling.
Inspect the inside of the burner for blockage. The burner is comprised of a perforated stainless
steel tube with a woven metal wrapped around the outside. Do not attempt to stick objects
into the woven metal for cleaning purposes. This may damage the burner and reduce
performance. If blockage cannot easily be removed from inside the burner, compressed air
may be used to blow out any buildup.
Reassemble the burner, carefully placing all gaskets back to their original locations. Remount
the blower assembly to the mounting flange with the nuts and lock washers. Reconnect the
gas control to the flange with the four screws and reattach the air intake piping to the blower.
Finally, reinstall the ignitor and flame rod. Connect the wiring harnesses to the blower.
Restore power to the water heater and visually inspect the burner ignition through the sight
glass at the front of the mounting flange. When the system is working properly, ignition
should be smooth with an even flame distribution along the surface of the burner. The flames
should be short and blue with some yellow at the tips.
Page 42
SECTION VII: TROUBLESHOOTING
CAUTION
For your safety, the repair and servicing of this equipment shall only be performed by a
qualified agency.
Table 12: General Troubleshooting
Problem
Possible causes
Recommended Action
1) Check display for error code.
1) See Tables 12 and 13.
2) Air in the gas line.
2) Contact qualified agency to purge the air
from the gas line.
3) Loose wire connection.
3) Contact qualified agency to inspect wiring.
Burner does not stay lit
1) Check display for error code.
1) See Tables 12 and 13.
Rumbling noise in the tank during
burner operation
1) Scale or sediment build-up in tank.
1) Drain the water heater to remove scale and
sediment.
1) Heater undersized for load
1) Reduce hot water usage rate.
2) Check display for error code.
2) See Tables 12 and 13.
3) Temperature setting of control is too low.
3) Adjust setting as required.
Water too hot or not hot enough
1) Control temperature setting is too high or low.
1) Adjust setting as required
T&P relief valve is dripping water.
1) Excessive pressure condition in tank
(greater than 150 psi).
1) Contact qualified agency to inspect water
piping system. Expansion tanks are required
in closed systems.
T&P relief valve is gushing hot water.
1) Excessive temperature condition in tank
(greater than 210°F).
1) Lower the temperature setting on the control.
See "Section V: Operation" for instructions to
adjust the temperature setting.
Unable to light the burner
Insufficient hot water
Page 43
SECTION VII: TROUBLESHOOTING
Table 13 shows a list of lockout error codes. A lockout code will be visible on the control
display in the form of a code (letter "A" followed by a number) and a short message. Lockout
errors require a manual reset to resume operation after the root cause of the problem has been
solved. To manually reset the control, press the "i" button on the user interface.
Table 13: Lockout Error Codes
LOCKOUT ERRORS
Code
Error Message
A00
EXTND BLOCKING
ERROR
A01
IGNITION LOCKOUT
A05
GV RELAY ERROR
A06
SAFETY RELAY ERROR
A09, A11, A13, RAM, X!RAM, STATE,
A14
OR ROM ERRORS
A10, A12
E2PROM ERRORS
A15
AIR PROVING SW
ERROR
A16
15MS XRL ERROR
A17
AIR PROVING SW
ERROR
A19, A22, A23,
A27, A28, A29,
A30
various software
errors
A20
FLAME ERROR 2
A21
FLAME ERROR 1
A24
FLAME FAIL LOCKOUT
A36
BLOCKED VENT
A38
LOW GAS PRESSURE
Page 44
Description & Possible Causes
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
A blocking error has been present for more than 20 hours in a row.
Investigate the blocking error that caused the lockout.
There have been three unsuccessful ignition attempts in a row.
Dirty or faulty flame rod ! see manual.
Damaged or worn hot surface igniter ! see manual.
Faulty or loose wiring ! check wiring and connections to flame rod, hot
surface igniter, gas valve and blower.
Improper venting or restricted inlet/outlet ! see manual.
A failure was detected in the gas valve relay in the main control.
Contact a qualified agency to inspect the control.
A failure was detected in the Safety Relay in the main operating control.
Contact a qualified agency to inspect the control.
Various internal software errors.
Contact a qualified agency to inspect the control.
Various errors caused by E2PROM file (i.e. software error).
Contact a qualified agency to inspect the control.
The air proving switch is not opening when the blower is OFF.
Short in the wiring ! check the two pink wires.
Excessive wind or room draft is creating negative pressure.
Internal software error.
Contact a qualified agency to inspect the control.
The air proving switch is not closing when the blower is ON.
Switch openings are blocked ! inspect switch and tubing.
Loose or damaged wiring ! inspect pink wires and connections.
Blower is not turning on when energized by the control.
Internal software error.
Causes & Actions:
Contact a qualified agency to inspect the control.
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
The flame is still present 10 seconds after closing the gas valve.
The gas valve is not closing properly ! contact a qualified agency.
A flame is detected before ignition.
Contact a qualified agency to inspect the controls.
Flame signal has been lost ten times during one demand.
Dirty or faulty flame rod ! see manual.
Faulty or loose wiring to gas valve ! check wiring and connections.
Blocked vent error occurs 3 times in a 10 minute period.
See blocking error E36.
Low gas pressure error occurs 3 times in a 10 minute period.
See blocking error E38.
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
SECTION VII: TROUBLESHOOTING
Table 14 shows a list of blocking error codes. A blocking code will be visible on the control
display in the form of a code (letter "E" followed by a number) and a short message. Blocking
errors automatically reset once the error is corrected.
Table 14: Blocking Error Codes
BLOCKING ERRORS
Code
Description & Possible Causes
Error Message
E34 ! E38
WD INTERNAL ERROR
E31 ! E34
REF HI/LO TOO HI/LO
E35
FALSE FLAME
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
E36
BLOCKED VENT
Causes & Actions:
Description:
E38
LOW GAS PRESSURE
E39
FLUE GAS LIMIT
E43, E47
various WD ERRORS
E44
PHASE ERROR
E46
E51 or E52
E59 or E60
EARTH GROUND
ERROR
WATER T SENSOR
OPEN
WATER T SENSOR
SHORT
E65
FLUE SENSOR SHORT
E66
RESET BUTTON ERROR
E72
APPLIANCE SEL ERROR
E76, E77, E79,
OR E81
various fan errors
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Description:
Causes & Actions:
Internal software error.
Contact a qualified agency to inspect the control.
Internal hardware error.
Contact a qualified agency to inspect the control.
A flame is detected when no flame is allowed.
The control and/or gas valve is not working properly ! contact a qualified
agency.
The blocked vent circuit is open.
Intake or exhaust vent is blocked ! inspect and clean.
Faulty or loose wiring to switches ! check blue and yellow wires.
Excessive wind or room draft is creating high pressures.
The gas supply pressure is too low.
Low supply pressure or undersized piping ! see manual.
Gas supply is turned off.
Pressure drop due to other appliances on the same supply line.
Faulty or loose wiring to switch ! check black/yellow wires.
The flue gas temperature has exceded the high limit.
Exhaust pipe is blocked ! inspect and clean.
Various WD communication errors.
Contact a qualified agency to inspect the control.
The polarity at the main power supply is reversed.
The hot and neutral wires are reversed ! Contact a qualified agency to inspect
the installation.
A faulty earth ground connection is detected.
Improper wiring ! check all green wires.
The water temperature sensor is open.
Faulty or loose wiring ! check sensor, wires and connections.
The water temperature sensor is shorted.
Short in circuit ! check sensor, wires and connections.
The flue sensor is shorted.
Short in circuit ! check sensor, wires and connections.
An error has occurred with the reset button ("i" button)
Contact a qualified agency to inspect the control display.
An error has occurred due to incorrect applicance selection.
Contact a qualified agency to inspect the controls.
A communication error has occurred with the fan.
Contact a qualified agency to inspect the control
Page 45
SECTION VII: TROUBLESHOOTING
Table 15 should be referenced when troubleshooting the powered anode system. If the status
LED is off or flashing red, a problem has occurred and service is required. When the LED is a
constant green, the system is operating properly. NOTICE: The tank must be filled with
water prior to connecting the water heater to the power supply. The powered anode
system will only work properly if the tank is filled with water.
Table 15: Powered Anode Troubleshooting
LED status
Problem
OFF
The water heater is not connected to the mains power
supply.
Ensure that the water heater is plugged in.
Error occurred during start-up.
Reset power to the anode power supply by resetting the
mains power supply to the water heater.
The tank is not filled with water.
Disconnect water heater from mains supply and fill tank
with water.
Poor electrical connection between anode power
Flashing supply and anode rod.
Red
Solution
Check the insulation on all connecting harnesses for
bare spots. Check the connections at the power supply
and anode terminals.
Polarity is reversed due to incorrect wiring.
Refer to the wiring diagram and correct polarity.
Defective seal in adode brushing; anode rod is no
longer insulated from tank.
With an ohmmeter, check for electrical continuity
between the powered anode terminal and the brushing.
If there is continuity, replace the anode rod.
SERVICING THE FLAME ROD AND IGNITOR
If an A01 lockout error code is present there has been a problem with lighting the burner.
Two possible causes for this error are a dirty or faulty flame rod or a faulty ignitor.
Each component can be checked for proper operation.
The hot surface ignitor can be checked with a visual inspection through the burner assembly
sight glass. Before the gas valve opens in the ignition sequence, the ignitor will warm-up for
20 seconds. During this time, an orange glow will be visible through the sight glass. If
accessing the sight glass is not feasible, two simple checks can be made with a multimeter.
First, ignitor resistance may be measured at the end of the ignitor wiring terminal. Turn off
power to the water heater and disconnect the ignitor wire harness from the wire harness with
the two orange wires. Insert the multimeter probes into the ignitor wire harness terminal. At
normal room temperature, the ignitor resistance will be approximately 38 ohms. After a
heating cycle, the resistance will be in the range of 38 - 80 ohms (depending on when the
measurement is taken after the cycle). Besides resistance, the continuity of the ignitor circuit
can be checked. With the multimeter probes still in the terminal, switch the meter to check
for continuity. If continuity is not indicated, the ignitor must be replaced.
If the ignitor is working properly and the burner lights but goes out right away, check the
flame rod. The rod may be dirty or it could be damaged and a replacement will be required.
Start by turning off power to the water heater and remove the flame rod. Inspect the ceramic
insulator for cracks (replace if cracked). Clean the rod with fine steel wool and reinstall. Turn
on power to the water heater and enter the Installer Menu on the control display (see next
subsection for instructions). Arrow down until the third screen that displays the flame signal.
During the next ignition attempt, a flame signal (in microamps, "uA") will be displayed.
Under normal operation, the flame signal will be between 2 - 5 uA during a successful ignition
period. As the fan speed increases the flame signal will become stronger and eventually be in
the 5 - 7 uA range. A minimum flame signal of 1.25 uA is required to avoid a flame failure. If
the flame signal is 0 uA when a flame is present during the ignition period, the flame rod
needs to be replaced.
Page 46
SECTION VII: TROUBLESHOOTING
INSTALLER MENUS
System and troubleshooting information such as fan speeds, flame signal, ignition attempts,
and error history is available in the Installer Menu. Refer to Figure 33 for instructions to
access this menu and useful tips.
B
To a cc es s th e In s taller M en u , h old d o w n th e "O K " an d "M " b u tton s tog eth e r for 5
s eco n d s . M a k e su r e th e d is p lay is at th e h o m e s cr een b e for e p res s in g th e b u tton s .
Hot Water Demand
20%
110°F
INSTALLER MENU
Heater Status
Heater Config
System Test
T he Installer M e n u s cr een w ill b e d is p layed . H eater S tatu s c on ta in s u s efu l,
r eal-tim e in fo rm a tion p er tain in g to fan s p eed s , fla m e cu r re n t, flam e failu re
h is to ry, ig nitio n atte m p t h is to ry, an d lo ck o u t/b loc k in g e rr o r h is tor y. T h e H eater
S tatu s m en u can b e u s ed w h e n tr ou b les h o otin g th e w ater h e ater.
The Heater Config menu can be used to set a service reminder.
System Test can be used to maintain a constant input rate at low, ignition, or high input
fan speed. This can be useful when troubleshooting the heater or performing combustion
tests. The default setting in System Test is "OFF". Use the default setting to resume
normal operation.
P r es s th e "OK" b u tton to s ele ct H ea ter S ta tu s .
STATUS
Fan Speed
Actual
Low
xxxx RPM
xxxx RPM
Th e fir st s c ree n in th e S TA T U S m e n u d is p lays a ctu al fa n sp e ed an d th e lo w
p o w e r f a n s p e e d ( fa c t o r y s e t t i n g ) . A s a r e fe r e n c e p o i n t , w h e n t h e f a n s p e e d i s
d is p layed as "1 % " at th e h o m e s cr een th e a ctu al s p eed w ill m a tch th e lo w p o w er
s p eed .
U s e t h e d o w n a r r o w ( " -" ) t o a d v a n c e t o t h e n e x t s c r e e n .
STATUS
Fan Speed
Ignition
High
xxxx RPM
xxxx RPM
T h e s e c on d sc r e e n in th e S T A TU S m e n u s h o w s th e ign ition s p e e d a n d h igh
p o w e r fa n s p e e d ( b o t h a r e fa c t o r y s e t t i n g s ) . A s a r e fe r e n c e , w h e n t h e fa n s p e e d i s
d is p layed as "1 0 0 % " a t th e h o m e s cr ee n th e a ctu al s p eed w ill m atc h th e h ig h
p o w er s p eed .
U s e th e d o w n a r r o w ( "- ") to a d v a n c e to th e n e x t s c r e e n .
Th e th ir d s cr een d is p lays th e p res en t flam e cu r ren t m eas u rem en t. W h en a flam e
is p r es en t th is v alu e w ill v ar y b as e d on fa n s p ee d , b u t it w ill b e in th e r an g e o f 5 7 m ic r o a m p s m os t of th e tim e .
STATUS
Flame
Signal
Failures
0.0 uA
0
A ru n n in g to tal o f th e n u m b er o f flam e fa ilu re s is als o d is p layed . A flam e fa ilu re
is d efin ed as a lo s s in flam e s ign al after th e flam e h a s b e en p r o ve n d u r in g th e tr ial
f o r ig n itio n p e r io d .
U s e th e d ow n a rr ow ("-") to a dv an ce to th e n ex t s cre en .
STATUS
Ignition Attempts
Successful
Failures
T h e fou r th s cr ee n d is p la ys th e h is to r y o f ign ition a ttem p ts . A r u n n in g to ta l of
s u c ces s fu l an d faile d atte m p ts is g iv en .
0
0
U s e th e d o w n a r r o w ( "- ") to a d v a n c e to th e n e x t s c r e e n .
STATUS
Heater Run Time
DHW
STATUS
Exx
x Hrs to prev. Block
err o r m es s age
Th e fifth s cr ee n d is p la ys th e to ta l h ou rs o f h e atin g tim e fo r th e w ate r h ea ter .
0 HR
U s e th e d o w n a r r o w ( "- ") to a d v a n c e to th e n e x t s c r e e n .
Th e s ix th s cr ee n d is p la ys th e h is to ry o f b lo ck in g er ro r s . T h e tim e in ter v al
b e t w e e n e r r o r s i s g i v e n i n M IN / H R S / D A Y / W K a s n e e d e d . T o t h e r i g h t o f t h e
w o rd "S T A TU S " is th e er ro r c o d e ("E " fo llo w ed b y a n u m b er ) an d th e er r or
m e s s ag e is s h o w n b e lo w th e tim e in ter va l.
U s e th e d o w n a r r o w ( "- ") to a d v a n c e to th e n e x t s c r e e n .
STATUS
Axx
x Hrs to prev. Lock
err o r m es s age
Th e fin al s cr ee n d is p lays th e h is to ry o f lo ck ou t er r or s . Th e tim e in te rv a l b e tw e en
e r r o r s i s g i v e n i n M IN / H R S / D A Y / W K a s n e e d e d . T o t h e r i g h t o f t h e w o r d
"S TA T U S " is th e err o r co d e ( "A " fo llo w e d b y a n u m b e r) an d th e er ro r m e s s ag e is
s h o w n b elo w th e tim e in ter va l.
P r e s s th e "M " b u tton to e x it th e S T A T U S m e n u s .
Figure 33: Using the Installer Menu
Page 47
SECTION VIII: PARTS LIST
Figure 34: optiTHERM Parts
Table 16: optiTHERM Parts
Page 48
#
1
2
3
4
4A
5
5A
6
7
8
9
10
11
12
Description
Control Panel Cover
Knob
Sight Glass
Flame Rod
Flame Rod Gasket
Hot Surface Ignitor
Hot Surface Ignitor Gasket
Air Intake Assembly
Insulation (Tank Top)
Cover Plate (Transition Chamber 2)
Powered Anode Rod, 43 in. length
Powered Anode Rod, 16 in. length
Air Proving Switch (w/ bracket)
Blocked Intake Switch (w/ bracket)
#
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Description
Power Supply Junction Box
Baffle
Outlet Pipe Nipple Assembly
Tank Temperature Sensors (2-in-1)
T&P Relief Valve
Condensate Elbow Assembly
Trim Plate (2 pcs.)
Flue Gas Temperature Sensor
Blocked Exhaust Switch
Inlet Pipe Nipple
Hand Hole Gasket
Hand Hole Cover Plate
Hand Hole Access Cover
Drain Valve
SECTION VIII: PARTS LIST
Figure 35: optiTHERM Control Panel Parts
Table 17: optiTHERM Control Panel Parts
#
1
2
3
4
5
6
7
Description
Control Display
Display Bracket
Main Operating Control
Terminal Block
Relay
Standoff, 3.5 in. length
Fuse Block
#
8
9
10
11
12
13
14
Description
Fuse, 5A (delay)
Transformer (120 VAC / 24 VAC)
Powered Anode Status LED
Powered Anode Power Supply
Standoff, 2.5 in. length
Power Switch Bracket
Power Switch (for main control)
Page 49
SECTION VIII: PARTS LIST
Figure 36: optiTHERM Burner Assembly Parts
Table 18: optiTHERM Burner Assembly Parts
#
1
2
2
3
3
Description
Gas Control Flange (w/ gasket)
Gas Control (NAT GAS_0-2,000 FT ALT)
Gas Control (LP GAS_0-2,000 FT ALT)
Pipe Nipple w/ 0.358" Orifice (NAT GAS models)
Pipe Nipple w/ 0.266" Orifice (LP GAS models)
#
5
6
7
8
9
Description
Gasket (blower to transition tube)
Transition Tube
Gasket (transition tube to burner)
Burner
Gasket (burner to mounting flange)
4
Blower
10
Flange Assembly
** - includes mounting flange, insulation disk, retaining plate and bolts
Page 50
**
SECTION VIII: PARTS LIST
T
Table 19: optiTHERM Wiring Harnesses
Connections
Part #
Description
21650
21652
21655
21657
21660
Blower Power Supply & PWM
Transformer & Flame Rod
Tank Temperature Sensors & Display
Hot Surface Ignitor
Main Power Supply
From
Main Control (J9) & Fuse Block
Main Control (J13)
Main Control (J5)
Main Control (J4)
Main Control (J2)
21664
Safety Switches
Main Control (J16)
21680
21677
21665
21667
21669
Gas Control
J!Box to Terminal Block
Plug!in Power Cord
Power Switch
Gas Pressure Switch
21673
Blower Relay (2 req'd)
21675
21671
15155
Power to Anode Controller
Flue Gas Temperature Sensor & Safety Switch
Anode Rods
Gas Control
Junction Box
Junction Box
Power Switch
Gas Pressure Switch
Relay
Relay
Terminal Block
Harness #21655 & Harness #21664
Anode Power Supply
To
Blower (2 connections)
24V Transformer & Flame Rod
Tank Temp. Sensors, Display & Harness #21671
Hot Surface Ignitor
Terminal Block & Power Switch
Air Proving Switch, Blocked Intake Switch, Harness
#21671 & Harness #21669
24V Transformer & Ground
Terminal Block
Standard 3!Prong 120VAC Plug
Terminal Block
Harness #21664 & Ground
Terminal Block
Fuse Block
Anode Power Supply
Flue Gas Sensor & Blocked Exhaust Switch
Anode Rods
Page 51
SECTION IX: WARRANTY
LIMITED WARRANTY FOR GAS-FIRED WATER HEATER
Bock Water Heaters, Inc.
110 S. Dickinson Street
Madison, WI 53703
Phone: 608-257-2225
WHAT DOES THIS LIMITED WARRANTY COVER?
This limited warranty applies only to the original consumer purchaser.
General Defects and Malfunctions: This warranty covers defections and malfunctions in your new
water heater for a period of one year from the original installation date. We will repair or replace,
at our option, any defective or malfunctioning component of the water heater. This limited
warranty will terminate if you sell or otherwise transfer the water heater, or the water heater is
installed at a location different from its original installation location.
Tank and Heat Exchanger: We also warrant that the tank and heat exchanger will not leak due to
defective materials or workmanship for five years from the date of original installation or from
date of manufacture in the event the Limited Warranty Registration Card was not completed and
returned to manufacturer. If the tank and heat exchanger is leaking and we have verified that the
leak is due to a defect in materials and workmanship, we will replace the tank with a tank that is
the nearest Bock model available at the time of replacement. If a replacement tank is provided, it
will remain warranted under this section as if it were the original tank. For example, if we send you
a replacement tank under this limited warranty two years after the original installation date, then
the replacement tank will remain warranted for the remaining three years after the original
installation date.
HOW DO YOU GET SERVICE UNDER THE LIMITED WARRANTY?
In order for the warranty period to begin on the date of installation, you must return the warranty
registration card attached below within 30 days of purchasing the water heater. You may also
register your water heater online at www.bockwaterheaters.com. You must have a copy of the
original sales receipt at the time you request service. Failure to return the warranty registration card
and provide a copy of the sales receipt will result in the warranty period beginning from the date
of manufacture.
To get service under this limited warranty you should contact either the dealer or installer. If dealer
or installer is unknown you can contact us via e-mail at [email protected] or call us
Monday through Friday between the hours of 8 o’clock a.m. to 5 o’clock p.m. Central Time at the
following number: 1-608-257-2225.
You can also write us at the following address:
Bock Water Heaters, Inc.
Warranty Support Group
110 S. Dickinson Street
Madison, WI 53703
Page 52
SECTION IX: WARRANTY
WHAT DOES THIS LIMITED WARRANTY NOT COVER?
This limited warranty does not cover water heaters that are or were:
•
•
•
•
•
Incorrectly installed, especially where the installation violates state or local
plumbing, housing or building codes
Operated at inappropriate settings, excessive pressures or temperatures.
Exposed to adverse local conditions and specifically sediment or lime precipitation in
the tank or corrosive elements in the atmosphere or unacceptable water quality.
Installed outside the United States or Canada.
Accidentally damaged.
Also, we will not cover the following charges, costs and losses:
•
•
•
•
Any freight or delivery charges.
Any removal or installation charges.
Charges to return the water heater or part to the manufacturer.
Water damage, loss or damage to property, inconvenience or loss of use.
WHAT WILL VOID THE LIMITED WARRANTY?
If you do any of the following, you will void this limited warranty:
•
•
•
•
•
•
•
•
Fail to retain an original copy of your sales receipt.
Fail to retain the actual rating plate from the water heater.
Alter or remove the serial number.
Transfer or sell the water heater.
Remove the water heater from its original location and install it somewhere else.
Fail to follow the care and maintenance instructions provided with the water heater.
Alter, disable or in any way cause the Impressed Current Cathodic Protection system
to be inoperable.
Fail to maintain in continuous good working condition the Impressed Current
Cathodic Protection system.
HOW DOES STATE LAW RELATE TO THIS LIMITED WARRANTY?
This is a limited warranty. WE MAKE NO OTHER EXPRESS WARRANTIES WITH RESPECT TO
THIS WATER HEATER. We will not assume, nor authorize any person to assume for us any
other liability in connection with the sale or operation of this water heater. ANY IMPLIED
WARRANTIES, INCLUDING MECHANTABILITY OR FITNESS FOR A PARTICULAR
APPLICATION, IMPOSED ON THIS SALE UNDER THE LAWS OF THE STATE OF SALE ARE
LIMITED TO ONE YEAR. This warranty gives you specific legal rights, and you may also have
other rights which vary from state to state. Some states do not allow limitations on how long
an implied warranty lasts, so the above limitation may not apply to you.
WE WILL NOT BE RESPONSIBLE FOR WATER DAMAGE, LOSS OF USE OF THE UNIT,
INCONVENIENCE, LOSS OR DAMAGE TO PERSONAL PROPERTY, WHETHER DIRECT OR
INDIRECT, AND WHETHER ARISING IN CONTACT OR TORT. Some states do not allow the
exclusion of incidental or consequential damages, so the above exclusion may not apply to
you.
Bock Water Heaters, Inc. • 110 South Dickinson Street • Madison, WI 53703
Telephone 608-257-2225 • Fax 608-257-5304
www.bockwaterheaters.com
Page 53
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