PeerlessBoilers PBC-40 Instruction manual

PBC™
Gas Boilers
PBC-34™, PBC-40™, PBC-52™
Combination
Installation,
Operation &
Maintenance
Manual
Series

USING THIS MANUAL 1
A. INSTALLATION SEQUENCE . . . . . . . . . . . . . .1
B. SPECIAL ATTENTION BOXES . . . . . . . . . . . . .1
1. PREINSTALLATION 2
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
B. CODES & REGULATIONS . . . . . . . . . . . . . . . .2
C. ACCESSIBILITY CLEARANCES . . . . . . . . . . . .3
D. COMBUSTION & VENTILATION AIR . . . . . . . .3
2. BOILER SET-UP 7
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
B. MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3. VENTING & AIR INLET PIPING 8
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
B. APPROVED MATERIALS . . . . . . . . . . . . . . . . .8
C. EXHAUST VENT/AIR INTAKE
PIPE LOCATION . . . . . . . . . . . . . . . . . . . . . . . .9
D. EXHAUST VENT/AIR INTAKE PIPE SIZING . .12
E. EXHAUST VENT/AIR INTAKE PIPE
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .13
F. EXHAUST
TAPPING FOR VENT SAMPLE
. . .14
G. BOILER REMOVAL FROM COMMON
VENTING SYSTEM . . . . . . . . . . . . . . . . . . . .14
4. WATER PIPING AND CONTROLS 16
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
B. OPERATING PARAMETERS . . . . . . . . . . . . . .16
C. SYSTEM COMPONENTS . . . . . . . . . . . . . . . .16
D. SYSTEM PIPING . . . . . . . . . . . . . . . . . . . . . .18
E. FREEZE PROTECTION . . . . . . . . . . . . . . . . . .19
5. FUEL PIPING 23
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
B. FUEL LINE SIZING . . . . . . . . . . . . . . . . . . . . .23
C. GAS SUPPLY PIPING – INSTALLATION . . . .23
D. GAS SUPPLY PIPING – OPERATION . . . . . . .24
E. MAIN GAS VALVE – OPERATION . . . . . . . . .24
6. CONDENSATE DRAIN PIPING 26
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
B. CONDENSATE SYSTEM . . . . . . . . . . . . . . . .26
7. ELECTRICAL CONNECTIONS 27
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
B. CUSTOMER CONNECTIONS . . . . . . . . . . . . .27
C. INTERNAL WIRING . . . . . . . . . . . . . . . . . . . .27
8. BOILER CONTROL: INTERNAL
WIRING & OPERATION 30
A. CONTROL OVERVIEW . . . . . . . . . . . . . . . . . .30
B. AVAILABLE CENTRAL HEAT MODES . . . . . .30
C. AVAILABLE DOMESTIC HOT WATER
MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
D. DISPLAY UTILIZATION . . . . . . . . . . . . . . . . .31
E. USER MENU . . . . . . . . . . . . . . . . . . . . . . . . . .33
F. STATUS MENU–1000 LEVEL . . . . . . . . . . . . .33
G. INSTALLER MENU–2000 LEVEL . . . . . . . . . .35
H. MENU LEVELS 3000, 4000 & 5000 . . . . . . . .37
I. OUTDOOR RESET OPERATION . . . . . . . . . .38
J. IGNITION SEQUENCE . . . . . . . . . . . . . . . . . .39
K. ADDITIONAL SAFETY FUNCTIONS . . . . . . .40
9. START-UP PROCEDURE 41
A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
B. CHECK WATER PIPING . . . . . . . . . . . . . . . . .41
C. CHECK GAS PIPING . . . . . . . . . . . . . . . . . . . .41
D. CHECK OPERATION . . . . . . . . . . . . . . . . . . . .41
E. LIGHTING & OPERATING PROCEDURES . . .43
10. TROUBLESHOOTING 44
A. LOCKOUT ERRORS . . . . . . . . . . . . . . . . . . . .44
B. BLOCKING ERRORS . . . . . . . . . . . . . . . . . . . .44
C. WARNING ERRORS . . . . . . . . . . . . . . . . . . . .44
D. TYPICAL OPERATION CYCLE–
CENTRAL HEAT . . . . . . . . . . . . . . . . . . . . . . .44
E. TYPICAL OPERATION CYCLE–DHW . . . . . . .44
11. MAINTENANCE 49
A. GENERAL (WITH BOILER IN USE) . . . . . . . .50
B. WEEKLY (WITH BOILER IN USE) . . . . . . . . .50
C. ANNUALLY (BEFORE START OF
HEATING SEASON) . . . . . . . . . . . . . . . . . . . .50
D. CONDENSATE CLEANING
INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . .50
E. INSPECTION AND CLEANING OF
COMBUSTION CHAMBER COILS . . . . . . . . .50
F.
HEAT EXCHANGER GASKET
REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . .51
G. FLOW RESTRICTOR MAINTENANCE . . . . . .51
H. PLATE HEAT EXCHANGER
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . .52
12. BOILER DIMENSIONS & RATINGS 53
13. REPAIR PARTS 56
TABLE OF CONTENTS
TABLE OF CONTENTS

A. INSTALLATION SEQUENCE
Follow the installation instructions provided in this manual
in the order shown. The order of these instructions has
been set in order to provide the installer with a logical
sequence of steps that will minimize potential
interferences and maximize safety during boiler
installation.
B. SPECIAL ATTENTION BOXES
Throughout this manual special attention boxes are
provided to supplement the instructions and make special
notice of potential hazards. The definition of each of
these categories, in the judgement of PB Heat, LLC
are as follows:
USING THIS MANUAL
1
USING THIS MANUAL
Compliance with the Energy Policy and Conservation Act:
DANGER
Indicates a condition or hazard which will cause
severe personal injury, death or major property
damage. Indicates a condition or hazard which may
cause severe personal injury, death or major property
damage.
Indicates a condition or hazard which will or can
cause minor personal injury or property damage.
WARNING
Indicates special attention is needed, but not directly
related to potential personal injury or property
damage.
NOTICE
In accordance with Section 325 (f) (3) of the Energy Policy and Conservation Act, this boiler is equipped with a
feature that saves energy by reducing the boiler water temperature as the heating load decreases. This feature is
equipped with an override which is provided primarily to permit the use of an external energy management
system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces the boiler water temperature as the
heating load decreases.
• This boiler is not used for any space heating
• This boiler is part of a modular or multiple boiler system having a total input of 300,000 BTU/hr or greater.
• This boiler is equipped with a tankless coil.
IMPORTANT NOTICE
Indicates special attention is needed, but not directly
related to potential personal injury or property
damage.
CAUTION

A. GENERAL
1. Series PBC™ boilers are supplied completely
assembled as packaged boilers. The package should
be inspected for damage upon receipt; any damage to
the unit should be reported to the shipping company
and wholesaler. The boiler should be stored in a
clean, dry area.
2. Carefully read these instructions and be sure to
understand the function of all connections prior to
beginning installation. Contact your PB Heat, LLC
Representative for help in answering questions.
3. This boiler must be installed by a qualified contractor.
The boiler warranty may be voided if the boiler is not
installed correctly.
4. A hot water boiler installed above radiation or as
required by the Authority having jurisdiction, must be
provided with a low water fuel cut-off device either as
part of the boiler or at the time of installation.
5. Series PBC™ boilers are capable of producing
instantaneous domestic hot water to the dwelling. Hot
water over 125°F can cause severe scald burns
instantly. If utilizing the domestic water production
features of the unit, be sure to:
a. Install a temperature limiting device per the device
manufacturer’s instructions to reduce scald hazard.
b. Set the temperature limiting device to the lowest
practical temperature setting.
c. Always feel water before bathing or showering.
d. Do not leave children, the disabled, or the elderly
unattended while bathing.
e. Additional point of use temperature limiting
devices may be required at the fixtures to reduce
scald hazard.
B. CODES & REGULATIONS
1. Installation and repairs are to be performed in strict
accordance with the requirements of state and local
regulating agencies and codes dealing with boiler and
gas appliance installation.
2. In the absence of local requirements the following
should be followed:
a. ASME Boiler and Pressure Vessel Code, Section
IV - “Heating Boilers”
b. ASME Boiler and Pressure Vessel Code, Section
VI - “Recommended Rules for the Care and
Operation of Heating Boilers”
c. ANSI Z223.1/NFPA 54 - “National Fuel Gas Code”
d. ANSI/NFPA 70 - “National Electrical Code”
e. ANSI/NFPA 211 - “Chimneys, Fireplaces, Vents
and Solid Fuel Burning Appliances”
3. Where required by the authority having jurisdiction,
the installation must conform to the Standard for
Controls and Safety Devices for Automatically Fired
Boilers, ANSI/ASME CSD-1.
**Please read if installing in Massachusetts**
Massachusetts requires manufacturers of Side Wall
Vented boilers to provide the following information
from the Massachusetts code:
•A hard wired carbon monoxide detector with an
alarm and battery back-up must be installed on
the floor level where the gas equipment is to be
installed AND on each additional level of the
dwelling, building or structure served by the side
wall horizontal vented gas fueled equipment.
•In the event that the side wall horizontally vented
gas fueled equipment is installed in a crawl space
or an attic, the hard wired carbon monoxide
detector with alarm and battery back-up may be
installed on the next adjacent floor level.
•Detector(s) must be installed by qualified licensed
professionals.
•APPROVED CARBON MONOXIDE
DETECTORS: Each carbon monoxide detector
shall comply with NFPA 720 and be ANSI/UL
2034 listed and IAS certified.
•SIGNAGE: A metal or plastic identification plate
shall be permanently mounted to the exterior of
the building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent
terminal for the horizontally vented gas fueled
heating appliance or equipment. The sign shall
read, in print size no less than one-half (1/2) inch
in size, “GAS VENT DIRECTLY BELOW.
KEEP CLEAR OF ALL OBSTRUCTIONS”.
2
PREINSTALLATION
1. PREINSTALLATION
Liquefied Petroleum (LP) Gas or Propane is heavier
than air and, in the event of a leak, may collect in low
areas such as basements or floor drains. The gas
may then ignite resulting in a fire or explosion.
WARNING
⚠ DANGER
– Water temperatures over 125°F
– (52°C) can cause severe burns
– instantly, or death from scalds.
– Children, the disabled, and the
– elderly are at the highest risk of
– being scalded.
– Feel water before bathing or showering.
– Read this manual in its entirety before setting
domestic hot water setpoint.
– A temperature limiting device (listed to ASSE 1070
or ASSE 1017) is required.

•EXEMPTIONS to the requirements listed above:
°The above requirements do not apply if the
exhaust vent termination is seven (7) feet or
more above finished grade in the area of the
venting, including but not limited to decks and
porches.
°The above requirements do not apply to a
boiler installed in a room or structure separate
from the dwelling, building or structure used in
whole or in part for residential purposes.
·This boiler installation manual shall remain with
the boiler at the completion of the installation.
See the latest edition of Massachusetts Code 248 CMR
for complete verbiage and also for additional (non-vent
related) requirements (248 CMR is available online).
If your installation is NOT in Massachusetts, please
see your authority of jurisdiction for requirements that
may be in effect in your area. In the absence of such
requirements, follow the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.
C. ACCESSIBILITY CLEARANCES
1. The Series PBC™ boiler is certified for closet
installations with zero clearance to combustible
construction. In addition, it is design certified for use
on combustible floors. Do not install on carpeting.
2. Figure 1.1 shows the minimum recommended
clearances to allow reasonable access to the boiler for
Models PBC-34™, PBC-40™ and PBC-52™.
However, Local codes or special conditions may
require greater clearances.
D. COMBUSTION AND VENTILATION AIR
1. The Series PBC™ boiler is designed for operation with
combustion air piped directly to the boiler from
outside the building (sealed combustion). Combustion
air may be supplied from within the building only if
adequate combustion air and ventilation air is
provided in accordance with the National Fuel Gas
Code or applicable sections of the local building code.
Subsections 3 through 10 as follows are based on the
National Fuel Gas Code requirements.
2. If the combustion air is piped directly to the boiler
from outside the building, no additional combustion
or ventilation air is required. Otherwise, follow the
National Fuel Gas Code recommendations
summarized in subsections 3 through 10.
3. Required Combustion Air Volume: The total required
volume of indoor air is to be the sum of the required
volumes for all appliances located within the space.
Rooms communicating directly with the space in
which the appliances are installed and through
combustion air openings sized as indicated in
Subsection 3 are considered part of the required
volume. The required volume of indoor air is to be
determined by one of two methods.
PREINSTALLATION
Figure 1.1: Minimum Accessibility Clearances – PBC-34™, PBC-40™, and PBC-52™
3
DANGER
DO NOT INSTALL ON CARPETING.

a. Standard Method: The minimum required volume
of indoor air (room volume) shall be 50 cubic feet
per 1000 BTU/Hr (4.8 m3/kW). This method is to
be used if the air infiltration rate is unknown or if
the rate of air infiltration is known to be greater
than 0.6 air changes per hour. As an option, this
method may be used if the air infiltration rate is
known to be between 0.6 and 0.4 air changes per
hour. If the air infiltration rate is known to be
below 0.4 then the Known Air Infiltration Rate
Method must be used. If the building in which this
appliance is to be installed is unusually tight, PB
Heat recommends that the air infiltration rate be
determined.
b. Known Air Infiltration Rate Method:
where:
Ifan = Input of the fan assisted appliances
in Btu/hr
ACH = air change per hour (percent of the
volume of the space exchanged per
hour, expressed as a decimal)
Note: These calculations are not to be used for
infiltration rates greater than 0.60 ACH.
4. Indoor Air Opening Size and Location: Openings
connecting indoor spaces shall be sized and located as
follows:
a. Combining Spaces on the Same Floor: Provide
two permanent openings communicating with
additional spaces that have a minimum free area
of 1 in2 per 1000 Btu/hr (22 cm2 per 1000 W) of
the total input rating of all gas fired equipment but
not less than 100 in2 (645 cm2). One opening is
to begin within 12 inches (305 mm) from the top
of the space and the other is to begin within 12
inches (305 mm) from the floor. The minimum
dimension of either of these openings shall be 3
inches (76 mm). See Figure 1.2 for an illustration
of this arrangement.
b. Combining Spaces on Different Floors: Provide
one or more permanent openings communicating
with additional spaces that have a total minimum
free area of 2 in2per 1000 Btu/hr (44 cm2per
1000 W) of total input rating of all equipment. See
Figure 1.3 for an illustration of this arrangement.
5. Outdoor Combustion Air: Outdoor combustion air is
to be provided through one or two permanent
openings. The minimum dimension of these air
openings is 3 inches (76 mm).
a. Two Permanent Opening Method: Provide two
permanent openings. One opening is to begin
within 12 inches (305 mm) of the top of the space
and the other is to begin within 12 inches (305
mm) of the floor. The openings are to
communicate directly or by ducts with the
outdoors or with spaces that freely communicate
with the outdoors. The size of the openings shall
be determined as follows:
i. Where communicating directly or through
vertical ducts with the outdoors each opening
shall have a minimum free area of 1 in2per
4000 Btu/hr (22 cm2per 4000 W) of total
input rating for all equipment in the space. See
Figure 1.4 for openings directly
communicating with the outdoors or Figure
1.5 for openings connected by ducts to the
outdoors.
ii. Where communicating with the outdoors through
horizontal ducts, each opening shall have a
minimum free area of 1 in2per 2000 Btu/hr (22
cm2per 2000 W) of total rated input for all
appliances in the space. See Figure 1.6.
4
Figure 1.2: Air Openings – All Air from Indoors
on the Same Floor
Figure 1.3: Air Openings – All Air from Indoors
on Different Floors
PREINSTALLATION
15 ft3Ifan
ACH 1000Btu/hr
Required Volumefan =
⎛
⎜
⎝
⎛
⎜
⎝

b. One Permanent Opening Method: Provide one
permanent opening beginning within 12 inches
(305 mm) of the top of the space. The opening
shall communicate directly with the outdoors,
communicate through a vertical or horizontal duct,
or communicate with a space that freely
communicates with the outdoors. The opening
shall have a minimum free area of 1 in2per 3000
Btu/hr. of total rated input for all appliances in the
space and not less than the sum of the cross
sectional areas of all vent connectors in the space.
The gas-fired equipment shall have clearances of
at least 1 inch (25 mm) from the sides and back
and 6 inches (150 mm) from the front of the
appliance. See Figure 1.7 for this arrangement.
6. Combination Indoor and Outdoor Combustion Air: If
the required volume of indoor air exceeds the
available indoor air volume, outdoor air openings or
ducts may be used to supplement the available indoor
air provided:
a. The size and location of the indoor openings
comply with Subsection 3.
b. The outdoor openings are to be located in
accordance with Subsection 4.
c. The size of the outdoor openings are to be sized
as follows:
where:
Areq = minimum
area of outdoor openings.
Afull = full size of outdoor openings calculated
in accordance with Subsection 4.
Vavail = available indoor air volume
Vreq = required indoor air volume
7. Engineered Installations: Engineered combustion air
installations shall provide an adequate supply of
combustion, ventilation, and dilution air and shall be
approved by the authority having jurisdiction.
5
Figure 1.4: Air Openings – All Air Directly from
Outdoors
Figure 1.5: Air Openings – All Air from Outdoors
through Vertical Ducts
Figure 1.6: Air Openings – All Air from Outdoors
through Horizontal Ducts
Figure 1.7: Air Openings – All Air from Outdoors
PREINSTALLATION
Areq = Afull x 1 – Vavail
Vreq
⎛
⎜
⎝
⎛
⎜
⎝

8. Mechanical Combustion Air Supply:
a. In installations where all combustion air is
provided by a mechanical air supply system, the
combustion air shall be supplied from the
outdoors at the minimum rate of 0.35 ft3/min per
1000 Btu/hr (0.034 m3/min per 1000 W) of the
total rated input of all appliances in the space.
b. In installations where exhaust fans are installed,
additional air shall be provided to replace the
exhaust air.
c. Each of the appliances served shall be interlocked
to the mechanical air supply to prevent main
burner operation when the mechanical air supply
system is not in operation.
d. In buildings where the combustion air is provided
by the mechanical ventilation system, the system
shall provide the specified combustion air rate in
addition to the required ventilation air.
9. Louvers & Grills:
a. The required size of openings for combustion,
ventilation, and dilution air shall be based on the
net free area of each opening.
i. Where the free area through a louver or grille
is known, it shall be used in calculating the
opening size required to provide the free area
specified.
ii. Where the free area through a louver or grille
is not known, it shall be assumed that wooden
louvers will have 25% free area and metal
louvers and grilles will have 75% free area.
iii. Non-motorized dampers shall be fixed in the
open position.
b. Motorized dampers shall be interlocked with the
equipment so that they are proven in the full open
position prior to ignition and during operation of
the main burner.
i. The interlock shall prevent the main burner
from igniting if the damper fails to open during
burner startup.
ii. The interlock shall shut down the burner if the
damper closes during burner operation.
10. Combustion Air Ducts:
a. Ducts shall be constructed of galvanized steel or
an equivalent corrosion-resistant material.
b. Ducts shall terminate in an unobstructed space,
allowing free movement of combustion air to the
appliances.
c. Ducts shall serve a single space.
d. Ducts shall not serve both upper and lower
combustion air openings where both such
openings are used. The separation between ducts
serving upper and lower combustion air openings
shall be maintained to the source of combustion
air.
e. Ducts shall not be screened where terminating in
an attic space.
f. Horizontal upper combustion air ducts shall not
slope downward toward the source of the
combustion air.
g. Combustion air intake openings located on the
exterior of buildings shall have the lowest side of
the combustion air intake opening at least 12
inches (305 mm) above grade.
11. Refer to Section 3 of this manual, Venting & Air Inlet
Piping, for specific instructions for piping the exhaust
and combustion air.
6
PREINSTALLATION
Do not install this boiler where gasoline or other
flammable liquids or vapors are stored or are in use.
WARNING
This boiler is certified as an indoor appliance. Do not
install this boiler outdoors or locate where it will be
exposed to freezing temperatures.
WARNING
Do not install this boiler in the attic.
WARNING

7
A. GENERAL
1. Series PBC™ boilers are intended for installation in an
area with a floor drain or in a suitable drain pan. Do
not install any boiler where leaks or relief valve
discharge will cause property damage.
2. The Series PBC™ boiler is not intended to support
external piping. All venting and other piping should
be supported independently of the boiler.
3. Install the boiler level to prevent condensate from
backing up inside the boiler.
4. Series PBC™ boilers are wall mounted.
B. UNPACKING THE UNIT
1. Items included inside of the boiler cabinet:
a. Two vent adapters
b. Miscellaneous parts kit
2. Remove external foam packaging and remove the
front panel from the unit. The unit can be easily lifted
out of the carton by gripping the bottom front edge of
the base panel and the inside of the front edge of the
top panel.
3. With the boiler flat on the back panel, remove the
right side panel to access the vent adapters and
miscellaneous kit. Remove these components.
4. Remove the internal packaging block behind
the gas valve.
5. The boiler can now be placed upright on a flat stable
surface for further pre-installation work.
C. MOUNTING
1. A wall mounting bracket kit (5636) is included for wall
mounting these boiler sizes.
2. Mount the bracket level on the wall using 5/16" lag
bolts. Be sure the lag bolts are fully supported by wall
studs or adequate wall structure.
3. The mounting bracket has (4) holes on 16" centers as
shown in Figure 2.1. This is intended to give installers
the ability to mount the bracket on two wall studs
spaced at this interval. If existing wall studs are spaced
differently or if the desired location is not in line with
the wall studs additional support is required.
4. Install the two ½"-13 by 4" bolts supplied with the
boiler into the weld nuts in the base of the unit. The
depth that these are threaded into the base can be
adjusted to assure the proper level of the boiler. Adjust
the bolts until the unit is tilted slightly off level to the
rear to aid in condensate draining.
5. Be sure that the wall provides adequate support for
the boiler.
6. Be sure to adequately support the boiler while
installing external piping or other connections.
7. Be sure that condensate piping is routed to a suitable
drain or condensate pump.
BOILER SET-UP
2. BOILER SET-UP
The wall mounting bracket is designed to support the
boiler. External piping for water, venting, air intake
and fuel supply is to be supported separately
WARNING
Figure 2.1: Wall Mounting Bracket
This boiler must be installed level to prevent
condensate from backing up inside the boiler.
CAUTION
Make sure the boiler wall bracket is adequately
supported. Do not install this bracket on dry wall
unless adequately supported by wall studs.
WARNING

8
A. GENERAL
1. Install the Series PBC™ boiler venting system in
accordance with these instructions and with the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, CAN/CGA B149,
and/or applicable provisions of local building codes.
2. The Series PBC™ boiler is a direct vent appliance and
is ETL Listed as a Category IV appliance with Intertek
Testing Laboratories, Inc.
3. Sources of combustion air contaminated with chlorine,
ammonia or alkali agents must be avoided. Do not
install this boiler near a swimming pool, hot tubs or
laundry. Do not store chemicals near the boiler.
4. The Exhaust Vent and Air Intake adapters are
provided loose inside of the boiler cabinet and must be
installed securely using the provided screws and
gaskets. See Figure 3.1 below for proper orientation.
Ensure that the vent adapter is fully inserted in the
heat exchanger outlet gasket and that the foam seal is
installed between the jacket and the flange of the adapter.
B. APPROVED MATERIALS
1. Table 3.1 lists approved materials for vent pipe (and
adhesives where applicable). Use only these materials
for exhaust vent piping.
2. PVC pipe and fittings are not to be used for venting in
confined spaces such as closet installations. Use only
CPVC or polypropylene (InnoFlue or PolyPro) vent
pipe under these conditions.
3. Cellular core piping is approved for inlet air piping only.
* PVC pipe/fittings are not to be used for venting within
confined spaces.
Notice: Installations in Canada require compliance with
ULC S636 - Standard for Type BH Gas Venting Systems.
VENTING & AIR INLET PIPING
3. VENTING & AIR INLET PIPING
This vent system operates under positive pressure.
Vent connectors serving appliances vented by
natural draft shall not be connected into any portion
of this venting system. Failure to comply may result
in serious injury, death or major property damage.
WARNING
Only the materials listed below are approved for use
with the Series PBC™ boiler. Use only these
components in accordance with these instructions.
Failure to use the correct material may result in
serious injury, death, or major property damage.
WARNING
Table 3.1: Approved Materials for Exhaust Vent Pipe
Description Material
Conforming to
Standard
Vent Piping
& Fittings
PVC (Sch 40 or 80)* ANSI/ASTM D1785
CPVC (Sch 40 or 80) ANSI/ASTM F441
PVC-DWV*ANSI/ASTM D2665
Duravent FastNSeal®
AL29-4C Stainless
Steel
UL1738 & ULC-S6
PolyPro®
(Polypropylene) ULC-S636
InnoFlue®
(Polypropylene) ULC-S636
Z-DENS®
(Polypropylene) ULC-S636
Pipe Cement
(PVC & CPVC Only) PVC/CPVC Cement ANSI/ASTM D2564
Figure 3.1: Exhaust and Air Intake Location and
installation
Improper installation of the Vent adapter could result in
the escape of combustion products causing severe
personal injury, death or major property damage.
WARNING
- All 3” SCH40 PVC applications require 9 inches of
straight vent pipe between the vent adapter the first
elbow.
- All 2” SCH40 PVC applications require the first 10
equivalent feet to be of CPVC material
NOTICE
The venting system for this product is to be installed in
strict accordance with these venting instructions.
Failure to install the vent system properly may result in
severe personal injury, death or major property damage.
WARNING

9
C. EXHAUST VENT/AIR INTAKE PIPE
LOCATION
1. Install vent piping before installing water, fuel, or
condensate piping. Working from largest to smallest
diameter reduces the complexity of piping
interferences.
2. Vent and air intake piping is to be installed so that
there is sufficient access for routine inspection as
required in Section 11, of this manual.
3. The vent piping for this boiler is approved for zero
clearance to combustible construction. However, a fire
stop must be used where the vent pipe penetrates
walls or ceilings.
4. The Peerless®Series PBC™ boiler, like all high
efficiency, gas-fired appliances, is likely to produce a
vapor plume due to condensation. Surfaces near the
vent termination will likely become coated with
condensation.
5. Air Intake Pipe Location – Sidewall Venting:
a. Provide 1 foot (30 cm) clearance from the bottom
of the air intake pipe to the level of maximum
snow accumulation. Snow removal may be
necessary to maintain clearances.
b. Do not locate air intake pipe in a parking area
where machinery may damage the pipe.
c. Maintain a minimum of 8" horizontal distance
between exhaust vent and the air intake.
Increasing this distance minimizes the potential for
contamination of the inlet air with exhaust.
d. For multiple boiler installations, the minimum
horizontal distance between the inlet of one boiler
to the exhaust of an adjacent boiler is 8" center-to-
center. In addition, the minimum vertical distance
between the exhaust and air inlet is 6". See Figure
3.2 for an illustration.
e. The exhaust outlet of the vent pipe should not be
angled any more than 5º from horizontal.
f. Precautions should be taken to prevent
recirculation of flue gases to the air inlet pipe of
the boiler or other adjacent appliances.
7. Sidewall Venting Configuration:
a. See Figure 3.3 for an illustration of clearances for
location of exit terminals of direct-vent venting
systems.
VENTING & AIR INLET PIPING
Figure 3.3: Exit Terminal Location for Mechanical Draft and Direct-Vent Venting Systems
If the maximum equivalent vent length is exceeded,
the maximum burner input rate may be reduced.
NOTICE
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel®(polyphenolsulphone) for exhaust
vent is prohibited. Use of these materials as exhaust
vent may result in severe personal injury, death, or
major property damage.
WARNING
Figure 3.2: Vent Pipe Spacing for Multiple Series
PBC™ Boilers

10
• This boiler vent system shall terminate at least
3 feet (0.9 m) above any forced air inlet
located within 10 ft (3 m). Note: This does not
apply to the combustion air intake of a direct-
vent appliance.
• Provide a minimum of 1 foot (30 cm) distance
from any door, operable window, or gravity
intake into any building.
• Provide a minimum of 1 foot (30 cm) clearance
from the bottom of the exit terminal above the
expected snow accumulation level. Snow
removal may be required to maintain clearance.
• Provide a minimum of 4 feet (1.22 m)
horizontal clearance from electrical meters, gas
meters, gas regulators, and relief equipment. In
no case shall the exit terminal be above or
below the aforementioned equipment unless
the 4 foot horizontal distance is maintained.
• Do not locate the exhaust exit terminal over
public walkways where condensate could drip
and create a hazard or nuisance.
• When adjacent to public walkways, locate the
exit terminal at least 7 feet above grade.
• Do not locate the exhaust termination directly
under roof overhangs to prevent icicles from
forming or recirculation of exhaust gases from
occurring.
• Provide 3 feet clearance from the inside corner
of adjacent walls.
b. Figures 3.4 through 3.7 show approved sidewall
venting configurations using the standard fittings
supplied.
c. Figure 3.5 is only approved for locations in which
the outdoor temperature is above -5°F (-21°C) in
accordance with ASHRAE 90A-1980
recommendations.
d. Figure 3.8 shows approved sidewall vent
configuration using an optional concentric vent
termination kit. 2" (54837) or 3" (54498).
8. Vertical Venting Configuration:
a. Figure 3.9 shows the approved venting
configuration for vertical venting using the
standard fittings supplied.
b. Locate the air intake pipe inlet a minimum of 12"
above the expected snow accumulation on the
roof surface.
c. Locate the end of the exhaust vent pipe a minimum
of 12" above the inlet to the air intake pipe.
d. Figure 3.10 shows an approved vertical vent
configuration using the optional concentric vent
termination kit.
VENTING & AIR INLET PIPING
Figure 3.4: Standard Exhaust & Air Inlet Pipe
Terminations
Figure 3.5: Offset Exhaust and Air Inlet
Terminations
Condensing flue gases can freeze on exterior
building surfaces which may cause discoloration and
degradation of the surfaces.
CAUTION

11
Figure 3.6: Exhaust and Air Inlet on Opposite Walls
Figure 3.7: Sidewall Exhaust with Indoor Air
Figure 3.8: Optional Concentric Vent Kit
Installation
VENTING & AIR INLET PIPING

12
e. Figure 3.11 shows an option for routing the
exhaust and air inlet piping through an unused
chimney.
f. Figure 3.12 shows this option using inlet air from
a sidewall position.
g. Figure 3.13 shows an option for routing the
exhaust through an unused chimney with the
combustion air supplied from inside the building.
Be sure to note the requirements for combustion
air as listed under Section 1.D. “Combustion and
Ventilation Air”. These requirements are in
accordance with the National Fuel Gas Code.
D. EXHAUST VENT/AIR INTAKE PIPE SIZING
1. Series PBC™ boilers can be installed with 2" or 3"
Exhaust Vent/Air Intake piping with the vent length
restrictions shown in table 3.2 below. 2" applications
require a 3" initial connection with a reduction to 2"
venting.
2. Polypropylene vent systems can be installed using the
vent adapters provided with the boiler. The adapters
are compatible with 3" PVC or CPVC, 3" or 80mm
polypropylene and 3" AL-29-4C grade stainless steel.
Figure 3.9: Standard Vertical Vent Installation
VENTING & AIR INLET PIPING
Figure 3.10: Concentric Vertical Vent Installation
Figure 3.11: Venting Through a Chimney Using
Outside Air

3. Combined systems using separate polypropylene
exhaust & air inlet pipes which transitions to concentric
can also be installed. Contact you Centrotherm,
Duravent or NovaFlex representative for more
information.
4. All 2" SCH40 PVC applications require the
first 10 equivalent feet to be of CPVC or
Polypropylene material.
a. The equivalent length of elbows, tees and other
fittings are listed in Table 3.3.
E. EXHAUST VENT/AIR INTAKE INSTALLATION
1. Figures 12.1 & 12.2 show the exhaust connection on
top of the boiler, near the rear in the center.
a. The exhaust connection for PBC-34™, PBC-40™,
and PBC-52™ boilers is a 3" polypropylene adapter
that will accept PVC, polypropylene or AL29-4C
stainless steel piping. All materials are secured using
the built in band clamp. Tighten securely. DO NO
USE CEMENT ON BOILER CONNECTIONS.
b. All PVC/CPVC connections after the boiler
connection are to be joined with suitable
PVC/CPVC adhesives in accordance with
manufacturers’ instructions.
13
VENTING & AIR INLET PIPING
Figure 3.12: Venting Through a Chimney Using
Sidewall Outside Air
Figure 3.13: Venting with a Chimney Using Inside Air
Maximum Allowable Vent Length (Ft)
2" (60mm) Diameter
Feet (Meters)
3" (60mm) Diameter
Feet (Meters)
PBC-34 60 (18.28) 100 (30.48)
PBC-40 60 (18.28) 100 (30.48)
PBC-52 20 (6.1) 100 (30.48)
Table 3.2: Maximum Allowable Vent Length for
Series PBC™ Boiler Installations
Equivalent Length (Feet)
Vent Size
2" Vent 3"Vent
Elbow, 90° 7 feet 5 feet
Elbow, 45° 4 feet 3 feet
Coupling 0 feet 0 feet
Air Intake Tee 0 feet 0 feet
Concentric Vent Kit 3 feet 3 feet
Table 3.3: Equivalent Length of Fittings
Exhaust Vent/Air Intake length in excess of maximum
listed equivalent feet may result in reduced input due
to excessive pressure drop.
NOTICE
Covering non-metallic exhaust venting material is
prohibited and may result in severe personal injury,
death, or major property damage.
WARNING

14
2. The Air Intake connection is to the right of the exhaust.
3. Remove all burrs and debris from the joints and
fittings.
4. Horizontal lengths of exhaust vent must be installed
with a slope of not less than 1/4" per foot (21 mm per
meter) toward the boiler to allow condensate to drain
from the vent pipe. If the vent pipe must be piped
around an obstacle that causes a low point in the
piping, a drain with an appropriate trap must be
installed.
5. All piping must be fully supported. Use pipe hangers at
a minimum of 4 foot (1.22 meter) intervals to prevent
sagging of the pipe.
6. Exhaust and air inlet piping is to be supported
separately and should not apply force to the boiler.
7. Penetration openings around the vent pipe and air
intake piping are to be fully sealed to prevent exhaust
gases from entering building structures.
8. PVC & CPVC Piping:
a. Use only solid PVC or CPVC Schedule 40 or 80
pipe for exhaust venting. Cellular core PVC or
CPVC is not approved for exhaust vent.
b. All joints in vent pipe, fittings, and all vent
termination joints must be properly cleaned,
primed and cemented. Use only cement and
primer approved for use with PVC or CPVC pipe
that conforms to ANSI/ASTM D2564. Boiler
connections do NOT require cement.
c. A straight coupling is to be used as an
outside vent termination. One of the two
screens is to be installed to prevent birds or
rodents from entering.
d. An air intake tee should be used as an air intake
termination. A screen is to be installed to prevent
birds or rodents from entering.
e. The following are optional combination air
intake/exhaust terminations that are available
separately from your PB Heat, LLC distributor for
use with Series PBC™ boilers.
f. Refer to Figures 3.4 through 3.8 for sidewall
venting options using PVC or CPVC pipe.
g. Refer to Figures 3.9 through 3.13 for vertical
venting options using PVC or CPVC pipe.
F. EXHAUST TAPPING FOR VENT SAMPLE
To properly install the Series PBC™ boiler, carbon dioxide
(CO2) and carbon monoxide (CO) levels in the exhaust
vent must be determined from a sample of combustion
products. To do this use the built in sampling port in the
3-in-1 adapters. Be sure to replace the cap after sampling
the combustions.
G. BOILER REMOVAL FROM COMMON
VENTING SYSTEM
At the time of removal of an existing boiler, follow these
steps with each appliance remaining connected to the
common venting system placed in operation, while the
other appliances remaining connected to the common
venting system are not in operation:
Retrait de la chaudière d’un système d’évacuation
commun. Au moment de retirer une chaudière existante,
il est important de suivre les étapes suivantes pour chaque
appareil raccordé au système d’évacuation commun qui
sont en service, alors que les autres appareils demeurant
raccordés au système d’évacuation commun ne sont pas
en service:
1. Seal any unused openings in the common venting
system.
Sceller toute ouverture du système d’évacuation
commun non utilisée.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
Effectuer un contrôle visuel du système d’évacuation
pour vérifier la taille et la pente horizontale et
s’assurer qu’il n’existe aucun blocage ou obstruction,
fuite, corrosion ni tout autre problème pouvant
menacer la sécurité.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building.
Dans la mesure du possible, fermer toutes les portes
et fenêtres de l’immeuble ainsi que toutes les portes
entre l’espace dans lequel les appareils qui demeurent
raccordés au système d’évacuation commun se
trouvent et le reste de l’immeuble.
4. Turn on any clothes dryers and any appliance not
connected to common venting system. Turn on any
exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do
not operate a summer exhaust fan.
VENTING & AIR INLET PIPING
3" 2"
Description
Stock
Code Description
Stock
Code
Sidewall Termination Kit
– PolyPro 3PPS-HK 54498 Sidewall Termination Kit
– PolyPro 2PPS-HKL 54837
Vertical Vent Termination
Kit – PolyPro 3PPS-VK 54500 Vertical Vent Termination
Kit – PolyPro 2PPS-VKL 54838
Table 3.4: Concentric Vent Termination Kits
This appliance uses a positive pressure venting
system. All joints must be sealed completely to
prevent leakage of flue products into living spaces.
Failure to do this may result in severe personal injury,
death or major property damage.
WARNING

15
Mettre en marche les sécheuses et tout autre appareil
non raccordé au système d’évacuation commun.
Mettre en marche tous les ventilateurs aspirant, tels
que les hottes de cuisinière et les ventilateurs de salle
de bain, en les faisant fonctionner à vitesse maximum.
5. Close fireplace dampers.
Ne pas faire fonctionner les ventilateurs aspirant d’été.
Fermer les registres de foyers.
6. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat so
appliance will operate continuously.
Mettre en service l’appareil à inspecter. Suivre les
instructions concernant l’allumage. Régler le
thermostat afin que l’appareil fonctionne sans arrêt.
7. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or smoke from a cigarette, cigar, or
pipe.
Vérifier toute fuite à l’orifice de décharge du coupe-
tirage après que le brûleur ait fonctionné pendant 5
minutes. Utiliser la flamme d’une allumette ou d’une
chandelle ou encore la fumée d’une cigarette, d’un
cigare ou d’une pipe.
8. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other gas-burning appliance to their previous
conditions of use.
Après avoir établi que les résidus de combustion de
chaque appareil qui demeure raccordé au système
commun sont adéquatement évacués lorsque soumis
au test décrit ci-dessus, remettre en place les portes,
fenêtres, portes intérieures, ventilateurs aspirants,
registres de foyer et appareils fonctionnant au gaz.
9. Any improper operation of the common venting system
should be corrected so that the installation conforms
with the National Fuel Gas Code, ANSI Z223.1/NFPA
54 or CAN/CGA B149 Installation Codes.
Tout fonctionnement inadéquat du système
d’évacuation commun doit être corrigé de manière à
respecter les normes du National Fuel Gas Code,
ANSI Z223.1/NFPA 54 et/ou des Codes d’installation
CAN/ACG B149.
10. When resizing any portion of the common venting
system, the common venting system should be resized
to approach minimum size as determined using the
appropriate tables located in the chapter “Sizing of
Category I Venting Systems,” of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or CAN/CGA B149
Installation codes.
Lorsqu’il est nécessaire de modifier les dimensions de
toute portion du système d’évacuation commun, ces
dernières doivent être modifiées de manière à
respecter les dimensions minimums indiquées dans les
tableaux du chapitre « Sizing of Category I Venting
Systems » du National Fuel Gas Code, ANSI
Z223.1/NFPA 54 ou des Codes d’installation
CAN/ACG B149.
VENTING & AIR INLET PIPING

16
A. GENERAL
1. Size water supply and return piping in accordance
with system requirements rather than the boiler
connections.
2. If the Series PBC™ boiler is used to replace an existing
boiler, make sure the system piping is thoroughly
cleaned and free from debris before installing this boiler.
Sentinel Performance Solutions (http://www.sentinel-
solutions.net/us/) offers a full line of cleaners (X300),
sludge remover (X400), antifreeze (X500) and
corrosion inhibitors (X100/X500) for hydronic
applications.
3. In hydronic systems where sediment may exist, install
a strainer in the boiler return piping to prevent large
particles and pipe scale from entering the boiler heat
exchanger. Use a large mesh screen in the strainer.
4. Install this boiler so that the gas ignition system
components are protected from water (dripping, spraying,
etc.) during operation and service (circulator replacement,
condensate trap cleaning, sensor replacement, etc.).
5. The Series PBC™ heating boiler is intended for use in
a closed-loop hydronic system. Leaks in the piping
system may require constant make-up water which
may include oxygen, calcium and other substances
which may cause corrosion, calcium scale buildup, or
other attacks on the hydronic system piping. The
system water should have a pH value of between 8.2
and 9.5. The water hardness is to be maintained
between 50 ppm CaCO3(3 gr/gal) and 150 ppm
CaCO3(9 gr/gal). Also, a minimum water pressure of
14.5 psi is required for proper performance.
B. OPERATING PARAMETERS
1. The Series PBC™ boiler is designed to operate in a
closed loop hydronic system under forced circulation.
This requires the system to be completely filled with
water and requires a minimum water flow through the
boiler to operate effectively.
2. The minimum system pressure is 11.6 psig (80 kPa).
The maximum allowable pressure is 40 psig (275 kPa).
3. The recommended minimum system pressure for
optimal operation at higher temperature is 14.5 psi
(100kPa).
4. The internal pump is sized appropriately to allow for
the minimum flow rate required through the heat
exchanger. Ensure that the piping up to the boiler is
capable of handling a minimum flow rate of 5.0 GPM
to allow for proper flow rates when the boiler is in
CH mode.
C. SYSTEM COMPONENTS
Figure 4.1 shows the symbol key for piping diagrams in
this section. The following are brief descriptions of system
components.
1. Pressure/Temperature Gauge: A combination
pressure/temperature gauge is provided with each
Series PBC™ boiler to be mounted in the piping from
the boiler supply to the system as shown in Figures
4.2 & 4.3. Most local codes require this gauge.
2. Air Elimination: Closed loop hydronic systems require
air elimination devices. As the system water is heated,
dissolved oxygen and other gases will separate from
the liquid. An air elimination device (such as a TACO
Vortech®Air Separator) is required to remove the
dissolved gases preventing corrosion in the piping
system and eliminating noise.
3. Expansion Tank: An expansion tank (such as a Bell &
Gossett Series HFT) is required to provide room for
expansion of the heating medium (water or glycol
solution). Consult the expansion tank manufacturer's
instructions for specific information regarding
installation. The expansion tank is to be sized for the
required system volume and capacity. In addition, be
sure that the expansion tank is sized based on the
proper heating medium. Glycol solutions may expand
more than water for a similar temperature rise.
WATER PIPING AND CONTROLS
4. WATER PIPING & CONTROLS
Use only inhibited propylene glycol solutions which
are specifically formulated for hydronic systems.
Unlike automotive antifreeze, solutions for hydronic
applications contain corrosion inhibitors that will
protect system components from premature failure
due to corrosion.
CAUTION
Maximum Flow Rates and Input
Steel Pipe
Pipe Size Maximum Flow (GPM) BTU/HR
1/2" 215,000
3/4" 440,000
1" 880,000
1-1/4" 16 140,000
1-1/2" 25 220,000
2" 50 450,000
Copper Tubing
Tube Size Maximum Flow (GPM) BTU/HR
1/2" 1.50 15,000
3/4" 440,000
1" 880,000
1-1/4" 14 140,000
1-1/2" 22 220,000
2" 45 450,000
Table 4.1: Guide of Maximum Flow Rates for
Different Pipe Sizes with Input

17
4. Y-Type Strainer or Filter Ball®Valve: PB Heat recommends
the use of a strainer device in the system to prevent dirt or
sediment from clogging the heat exchanger. A 20 mesh
stainless steel screen is adequate to protect the heat
exchanger. The strainer should be cleaned often in the first
several months of operation. The Filter Ball®Valve from
Jomar International incorporates a strainer into a ball
valve which allows the technician to isolate the water
circuit while cleaning the strainer.
5. Flow Control Valve: Flow control valves such as the
TACO Flo-Chek or Bell & Gossett Flo-Control™ are
used to prevent gravity circulation by incorporating a
check valve with a weighted disc.
6. Pressure Reducing Valve: A pressure reducing valve,
such as the Bell & Gossett B-38 or a TACO #329, is
used in a hydronic system to automatically feed water
to the system whenever pressure in the system drops
below the pressure setting of the valve. These valves
should not be used on glycol systems unless close
supervision of the glycol solution is practiced.
7. Back Flow Preventer: A back flow preventer (check
valve) is required by some jurisdictions to prevent water
in the hydronic system from backing up into the city
water supply. This is especially important on systems in
which glycol solution is used as the heating medium.
8. Pressure Relief Valve: The boiler pressure relief valve
is shipped separately for field installation. The valve is
to be installed as shown in Figures 4.2 or 4.3. Pipe the
discharge of the relief valve to within 12" of the floor
and close to a floor drain. Provide piping that is the
same size or larger than the relief valve outlet.
WATER PIPING AND CONTROLS
Figure 4.1: Piping Symbol Key
Use only inhibited propylene glycol solutions which
are specifically formulated for hydronic systems.
Ethylene glycol is toxic and may cause an
environmental hazard if a leak or spill occurs.
WARNING
Do not operate this appliance without installing the
pressure relief valve supplied with the boiler or one
with sufficient relieving capacity in accordance with
the ASME Rating Plate on the boiler heat exchanger.
WARNING
Pipe the discharge of the relief valve as close as
possible to the floor and away from high traffic areas.
Pipe the discharge to a floor drain. Failure to do so
may result in personal injury and/or property
damage.
CAUTION

9. Low Water Cut Off: When installing a probe type
LWCO, locate the LWCO in the boiler supply above
the top jacket panel. Refer to Section 7. Electrical
Connection in this manual for wiring details.
10. Circulator: The Central Heat circulator is to be sized
to overcome the pressure drop of the system while
providing the flow required by the boiler. The PBC™
Series boilers have a built in circulator that guarantees
the minimum flow rate is maintained through the unit.
D. SYSTEM PIPING
The following section describes the piping requirements
for the Series PBC™ boilers as well as some best practices
that will improve the operation and lifetime of the unit.
See Figure 4.6 and 4.7 for suggested boiler piping for
Central Heat and Domestic.
1. Central Heat Piping
a. Primary secondary piping required - Series
PBC™ boilers utilize a water tube heat exchanger
that requires a minimum flow rate through the
unit. The internal pump provides enough flow to
maintain this minimum flow rate. For the pump to
consistently perform the boiler must be piped in a
primary/secondary fashion.
18
WATER PIPING AND CONTROLS
Figure 4.5: ScaleCutter®Water Treatment System
for Domestic Water Plate Heat
Exchanger Protection.
Figure 4.2: Water and Condensate Connection
Points
Figure 4.4: Final Piping Example with Webstone
Plumb Kit.
For existing systems that use iron pipe for heating
piping, the installation of a magnetic filter and a Y-
Type strainer is highly recommended. A modulating
condensing boiler such as the Series PBC™ when
operating at ideal system temperatures can cause
scaling to release from older iron pipe systems that
will cause restrictions in the heat exchanger
passages.
NOTICE
Figure 4.3: Safety Relief Valve Location