ECR Dunkirk Q95M-200 User manual

INSTALLATION MANUAL
Q95M-200
GAS-FIRED DIRECT VENT
MODULATING HOT WATER BOILER
DUNKIRK BOILERS
85 Middle Rd.
Dunkirk, NY 14048
www.dunkirk.com
An ISO 9001-2000 Certied Company
P/N 240006103D, Rev. A [05/08]

2
TABLE OF CONTENTS
GAS-FIRED DIRECT VENT MODULATING HOT WATER BOILER
INSTALLATION MANUAL Printed in USA • Made In USA
Keep this manual near boiler
and retain for future reference.
IMPORTANT: This boiler is to be installed by a
qualied installer only.
I - Introduction.....................................................2
II - Safety Symbols and Warnings ......................3
III - Rules For Safe Installation and Operation ...3
IV - Boiler Ratings and Capacities......................4
v - before installing the boiler..............................5
VI - Placing the Boiler.......................................11
VII - Near Boiler Piping.....................................12
VIII - combustion air and vent pipe...................14
IX - Gas Supply Piping .....................................16
X - Electrical Wiring ..........................................18
XI - Controls and Accessories ..........................19
XII - Water Treatment & Freeze Protection .....22
XIII - Putting the Boiler in Operation.................25
XIV - maintenance and cleaning.......................27
XV - Boiler Wiring Diagram...............................29
XVI - Piping and Wiring Appendix.....................30
I - INTRODUCTION
This appliance is a gas-red direct vent modulating cast
aluminum hot water boiler. A revolutionary cast aluminum
monoblock heat exchanger means better heat transfer
and thermal storage than similarly sized cast iron boilers,
which results in higher efciency. The heating system wa-
ter absorbs large amounts of heat from the cast aluminum
heat exchanger, cooling the ue gases and causing con-
densation. Sealed combustion, premix gas burner, and
low ame temperature means drastically reduced CO and
NOx emissions, which contribute to a cleaner and health-
ier environment.
This appliance, unlike normal residential atmospheric
and induced draft units, takes its combustion air directly
from the outdoors (sealed combustion) and does not
compete with building occupants for fresh air. Sealed
combustion (also known as “direct vent”) is the safest
and best way to obtain plenty of clean combustion air.
The forced draft fan draws in the outside combustion air
to mix with gas, which ows into the pre-mix burner and
burns. The fan then forces the resulting ue gases from
the boiler unit and provides a positive removal of the ue
gases from the building through inexpensive and read-
ily available PVC and CPVC pipes. ULC S636 Material
must be used in Canada.

3
III - RULES FOR SAFE INSTALLATION AND OPERATION
IMPORTANT: Failure to follow these instruc-
tions could cause a malfunction of the boiler
and result in death, serious bodily injury, and/or
property damage. For assistance or additional
information, consult a qualied installer, service
agency, or the gas supplier.
II - SAFETY SYMBOLS AND WARNINGS
This appliance has been equipped for resi-
dential installations. If used for commercial
applications, any and all additional code re-
quirements must be adhered to for installa-
tion. This may require additional controls,
including but not limited to an external wa-
ter cut off, a manual reset high temperature
limit, and wiring and/or piping modications.
The manufacturer is not responsible for any
eld installation changes made to a boiler
installation which are not described or ac-
knowledged in this manual.
WARNING
!
Indicates an imminently hazardous situation
which, if not avoided, will result in death,
serious injury or substantial property dam-
age.
DANGER
!
Indicates a potentially hazardous situation
which, if not avoided, could result in death,
serious injury or substantial property dam-
age.
WARNING
!
Indicates a potentially hazardous situation
which, if not avoided, could result in minor or
moderate injury or property damage.
CAUTION
!
Indicates special instructions on installation,
operation or maintenance which are important
but not related to personal injury hazards.
NOTICE
The following dened symbols are used throughout this manual to notify the reader of potential
hazards of varying risk levels.
Check all applicable state and local building 1.
codes and utility company requirements before
installation. This installation must conform with
these requirements in their entirety. In the ab-
sence of these codes, use NFPA installation
codes and good industry practice.
Before servicing the boiler, allow it to cool. Al-
2.
ways shut off any electricity and gas supply con-
nected to the boiler prior to servicing.
Inspect gas line for leaks. 3.
Be certain gas input rate is correct. Overring 4.
may result in early failure of the boiler compo-
nents. This may cause dangerous operation.
Underring may result in too much air for the pre-
mix burner causing poor or loss of combustion.
Never vent the products of combustion from this 5.
boiler to an enclosed space. Always vent to the
outdoors. Never vent to another room or to in-
side a building.
Be sure there is adequate outdoor air supply to 6.
boiler for complete combustion.
Follow a regular service and maintenance sched- 7.
ule for efcient and safe operation.
Keep boiler area clean of debris and free of com- 8.
bustible and ammable materials.
Proper through-the-wall or through-the-roof com- 9.
bustion venting shall be in accordance with the
materials and methods described in this manual.
Installation must comply with local codes.

4
IV - BOILER RATINGS AND CAPACITIES
TABLE 1: SEA LEVEL RATINGS - NATURAL AND PROPANE GASES
Boiler Input Rate
(MBH)(1) Heating Capacity
(MBH)(1)(2) Net I=B=R Rating (MBH)(1) AFUE(2) Flue Diameter Shipping Wt.
High Fire 200 190 165 95% 2” CPVC & 3” PVC 284 lbs.
Low Fire 80 76 66
(1) 1 MBH = 1,000 Btuh (British Thermal Units Per Hour)
(2) Heating Capacity and AFUE (Annual Fuel Utilization Efciency) are based on DOE (Department of Energy) test procedures.
TABLE 2: 95M-200 HIGH ALTITUDE DERATE CHART
Boiler Input
Rate (MBH) Altitude (In Feet)
3,000 (2) 4,000 (2) 5,000 (3) 6,000 7,000 8,000 9,000 10,000
High Fire 196 192 177 174.5 172 169 168 167
Low Fire 78.4 76.8 115 113.5 112 110 109 108
1) boiler Input Rate is determined at minimum vent length. The rate will decrease as vent length increases.
2) Parameter 17 is set to 2,250 at elevations of 2,000 feet above and below.
3) Parameter 17 must be raised to 3,200 at altitudes or elevations of 2,000 feet and above.
These low pressure gas-red hot water boilers are de-
sign certied by CSA International, for use with natural
and propane gases. The boilers are constructed and hy-
drostatically tested for a maximum working pressure of
50 PSIG (pounds per square inch gauge) in accordance
with ASME (American Society of Mechanical Engineers)
Boiler and Pressure Vessel Code Section IV Standards
for heating boilers.
The Boilers are certied in accordance with ANSI (Ameri-
can National Standards Institute) Z21.13 standards as
gas-red, direct vent, condensing, hot water boilers.
The Heating Capacity indicates the amount of heat avail-
able after subtracting the losses up the stack. Most of this
heat is available to heat water. A small portion is heat loss
from the jacket and surfaces of the boiler, and it is as-
sumed that this heat stays in the structure. The Net I=B=R
Rating represents the portion of the remaining heat that
can be applied to heat the radiation or terminal units (i.e.,
nned tube baseboard, cast iron radiators, radiant oor,
etc.) The difference between the Heating Capacity and
the Net I=B=R Rating, called the piping and pickup allow-
ance, establishes a reserve for heating the volume of wa-
ter in the system and offsetting heat losses from the pip-
ing. The Net I=B=R Ratings shown are based on a piping
and pickup factor of 1.15 in accordance with the I=B=R
Standard as published by the Hydronics Institute. The Net
I=B=R Rating of the boiler selected should be greater than
or equal to the calculated peak heating load (heat loss) for
the building or area(s) served by the boiler and associated
hot water heating systems. The manufacturer should be
consulted before selecting a boiler for installations having
unusual piping and pickup requirements.
This boiler and related hot water heating sys- 10.
tems are not do-it-yourself items. They must be
installed and serviced by qualied profession-
als. Ratings above are for sea level applications.
The boiler automatically derates input at a rate
of 2% for every 1000 feet above an elevation
of 2000 feet (see Table 2). The boiler will also
derate relative to the caloric value of the gas
being used. Use the formula specied in “Mea-
sure The Natural Gas Input Rate” in Section VII
of the Control Manual and Operating Instructions
(P/N# 240006104) to determine the proper rate
due to derated gas. To ensure proper operation
at 5,000 feet of altitude and above, the minimum
RPM setting; parameter 17, must be raised to
3,200. Instructions on how to change the param-
eters are included in the Parameter Guide, part
number 240006105.

5
V - BEFORE INSTALLING THE BOILER
In the State of Massachusetts, boiler installation must
conform to state code 248 CMR which includes but is
not limited to:
This product must be installed by a licenced Plumber •
or Gastter.
When exible connectors are used, the maximum •
length shall not exceed 36 inches.
When lever type gas shut-offs are used, they shall be •
T-handle type.
For all side wall horizontally vented gas fueled equipment
installed in every dwelling, building or structure used in
whole or in part for residential purposes, including those
owned or operated by the commonwealth and where the
side wall exhaust vent termination is less than seven (7)
feet above nished grade in the area of the venting includ-
ing but not limited to, decks and porches, the following
requirements shall be satised:
Installation of carbon monoxide detectors:1. At
the time of installation of the side wall horizontal vent-
ed gas fueled equipment, the installing plumber or
gastter shall observe that a hard wired carbon mon-
oxide detector with an alarm and battery back-up is
installed on the oor level where the gas equipment
is to be installed. In addition, the installing plumber
or gastter shall observe that a battery operated or
hard wired carbon monoxide detector with an alarm
is installed on each additional level of the dwelling,
building or structure served by the side wall horizontal
vented gas fueled equipment. It shall be the respon-
sibility of the property owner to secure the services of
qualied licensed professionals for the installation of
hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented A. gas fueled equipment is installed in a crawl space
or an attic, the hard wired carbon monoxide de-
tector with alarm and battery back-up may be in-
stalled on the next adjacent oor level.
In the event that the requirements of this subdivi-B.
sion can not be met at the time of completion of
installation, the owner shall have a period of thirty
(30) days to comply with the above requirements;
provided, however, that during said thirty (30) day
period, a battery operated carbon monoxide detec-
tor with an alarm shall be installed.
Approved carbon monoxide detectors:2. Each
carbon monoxide detector as required in accordance
with the above provisions shall comply with NFPA 720
and be ANSI/UL 2034 listed and IAS certied.
Signage3. : A metal or plastic identication plate shall
be permanently mounted to the exterior of the building
at a minimum height of eight (8) feet above grade di-
rectly in line with the exhaust vent terminal for the hori-
zontally vented gas fueled heating appliance or equip-
ment. 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”.
Inspection4. : The state or local gas inspector of the
side wall horizontally vented gas fueled equipment
shall not approve the installation unless, upon inspec-
tion, the inspector observes carbon monoxide detec-
tors and signage installed in accordance with the pro-
visions of 248 CMR 5.08(2)(a)1 through 4.
INSTALLERS - Follow local regulations with respect
to installation of Carbon Monoxide Detectors. Fol-
low maintenance recommendations in this manual.
WARNING
!
Review the following before installing the boiler
This boiler product is a gas-red, direct vent, condensing
boiler and must be installed in accordance with all appli-
cable federal, state and local building codes including, but
not limited to the following:
United States - Installation shall conform with National
Fuel Gas Code (NFPA-54/ANSI Z223.1- latest edition)
Canada - Installation shall be in accordance with CSA-
B149.1 and .2 installation codes.
Where required by the authority having jurisdiction, the in-
stallation must conform to the ASME Safety Code for Con-
trols and Safety Devices for Automatically Fired Boilers,
No.CSD-1.
The installation must conform to the requirements of the au-
thority having jurisdiction or, in the absence of such require-
ments, to the National Fuel Gas Code, ANSI Z223.1 - latest
revision.

6
Boiler Sizing
Check to be sure you have selected the boiler •
with the proper capacity before continuing the
installation. The I=B=R Rating of the boiler se-
lected should be greater than or equal to the
calculated peak heating load (heat loss) for the
building or area(s) served by the boiler and as-
sociated hot water heating systems. See “Ta-
ble 1: Sea Level Ratings - Natural and Propane
Gases” in Section IV of this manual.
Heat loss calculations should be based on approved •
industry methods.
Considerations for Boiler Location
Before selecting a location for the boiler, the follow-
ing should be considered. Each boiler considered
for installation must be:
Supplied with the correct type of gas (natural •
gas or propane).
Connected to a suitable combustion air intake •
piping system to supply the correct amounts
of fresh (outdoor) air for combustion (15’ mini-
mum equivalent length/100’ maximum equiva-
lent length).
Connected to a suitable venting system to re-•
move the hazardous products of gas combustion
(15’ minimum equivalent length/100’ maximum
equivalent length).
Connected to a suitable hot water heating system.•
V - BEFORE INSTALLING THE BOILER
Product-approved vent/air intake:5. A product-ap-
proved vent terminal must be used and, if applicable, a
product-approved air intake must be used. Installation
shall be in strict compliance with the manufacturer’s in-
structions.
Installation instructions:6. A copy of all installation
instructions for all Product Approved side wall hori-
zontally vented gas fueled equipment, all venting in-
structions, all parts lists for venting instructions, and/
or all venting design instructions shall remain with the
appliance or equipment at the completion of the in-
stallation.
Supplied with a suitable electrical supply for all •
boiler motors and controls.
Connected to a properly located thermostat or •
operating control (not included with boiler).
Placed on level surface (must NOT be installed •
on carpeting).
Condensate drain line must be pitched down •
to oor drain or external condensate pump
with reservoir at ¼” per foot (wood frame or
blocks may be used to raise boiler).
Locating the Boiler
Select a location which is level, central to the piping 1.
systems served and as close to the vent and air intake
terminals as possible.
Accessibility clearances, if more stringent (i.e. larger 2.
clearances) than required re protection clearances,
must be used for the boiler installation. Accessibility
clearances may be achieved with the use of remov-
able walls or partitions.
The boiler is approved for installation in closets and on 3.
combustible oors. This boiler shall NOT be installed
on carpeting.
The clearances shown in 4. Table 3 indicate required
clearances per CSA listing. A minimum 1” clearance
must be maintained between combustible construc-
tion and each of the right, top and back surfaces of
the boiler. Allow at least 24” at the front and left side
and 8”at the top for servicing. No combustible clear-
ances are required to venting or combustion air intake
piping.
TABLE 3: BOILER CLEARANCES*
Dimension Combustible
Construction Accessibility/ Cleaning Service
Top 1” 8” 8”
Left Side 1” 24” 24”
Right Side 1” - -
Base 1” - -
Front 024” 24”
Back 6” - -
Intake/Vent Piping 0- -
Near Boiler Hot
Water Piping 1” - -
* All distances measured from the cabinet of the boiler.

7
V - BEFORE INSTALLING THE BOILER
COMBUSTION AIR
EXHAUST
3” MAX.
8” MAX.
12” MIN ABOVE
HIGHESTANTICIPATED
SNOW LEVEL
Figure 1 - Roof Vent/Intake Terminations
OVERHANG
12" MINIMUM
90°
VENT
12" SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR INTAKE
AND BOTTOM OF VENT
12" SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR INTAKE
AND BOTTOM OF VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL OR
GRADE
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL OR
GRADE
MAX.
SEPARATION
18"
MAXIMUM
15"
MAXIMUM
LESS THAN 12" CLEARANCEABOVE GRADE
12" OR MORE CLEARANCE ABOVE GRADE
90°
BRACKET
VENT
18"
MAXIMUM
12" MINIMUM
OVERHANG
3"
MAXIMUM
SEPARATION
3”
Figure 2 - Sidewall Vent/Intake Terminations
VENT
1” MAX.
COMBUSTION AIR
Figure 3 - Concentric Vent Terminations
Equipment shall be installed in a location which fa- 5.
cilitates the operation of venting and combustion air
intake piping systems as described in this manual.
Advise owner of boiler to keep venting and combus-
6.
tion air intake passages free of obstructions. Both
the venting and combustion air intake piping systems
connected to the outdoors must permit ow through
the piping systems without restrictions for the boiler
to operate.
The boiler shall be installed such that the automatic 7.
gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during operation
and service (circulator replacement, control replace-
ment, etc.).
The boiler must be located where ambient room tem- 8.
peratures (minimum possible temperatures where
boiler is installed assuming boiler is not in operation
and therefore contributes no heat to the space) are
always at or above 32°F to prevent freezing of liquid
condensate.
Combustion Air and Vent Pipe Requirements
This boiler requires a dedicated direct vent system. In a
direct vent system, all air for combustion is taken directly
from outside atmosphere, and all ue products are dis-
charged to outside atmosphere.
Combustion air and vent pipe connections must terminate
together in the same atmospheric pressure zone, either
through the roof or sidewall (roof termination preferred).
See
Figures 1 and 2 for required clearances. If neces-
sary, use of screening no smaller than 1/2” hardware cloth
is acceptable.
If the concentric vent termination is being used, refer to
Figure 3 for proper setup.

8
V - BEFORE INSTALLING THE BOILER
NOTE: IF THERE ISA POTENTIAL FOR EXCESSIVE WINDS, SPECIAL
CONSIDERATION SHOULD BE GIVEN TO LOCATE THE VENT TERMINATION
AWAY FROM THE WINDWARD SIDE OF THE BUILDING.
VENT TERMINATION MUST BE AT LEAST
12” (31 CM) HORIZONTALLY FROM
ANY ELECTRIC METERS, GAS METERS
OR RELIEF EQUIPMENT.
LOCATE VENTTERMINATION TOALLOW
12” (31 CM) MINIMUMABOVE GRADE
VENT TERMINATION MUST BE AT LEAST
3 FEET (92 CM)ABOVEANY FORCED
AIR INLET LOCATED WITHIN 10 FT (305 CM)
MOUNT VENT TERMINATION AT LEAST
3 FT (92 CM) FROM INSIDE CORNERS
VENT TERMINATION MUST BE INSTALLED WITH
A CLEARANCE OF AT LEAST 12 INCHES (31 CM)
FROM ANY AIR OPENING INTO A BUILDING.
12”
MAX
Through the wall vents for Category II and IV appliances and non categorized condensing appliances shall not terminate over
public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the
operation of regulators, relief vales, or other equipment. Where local experience indicates that condensate is a problem with
Category I and III appliances, this provision shall also apply.
When utilizing two or more boilers, each termination must have at least 12 inches of clearance from any adjacent termination.
See diagrams below.

9
Keep boiler area clean of debris and
free of ammable and combustible
materials, vapors, and liquids.
CAUTION
!
Failure to follow these warnings could result in
re, property damage, personal injury, or death.
Whenventpipeisexposedtotemperatures• below freezing, such as when it passes
through an unheated space or when a
chimney is used as a chaseway, vent pipe
must be insulated with ½”Armaex or
equivalent. In extremely cold climate ar-
eas, use ¾”Armaex or equivalent.
Combustion air must be clean outdoor• air. Combustion air must not be taken
from inside the structure because that air
is frequently contaminated by halogens,
which include uorides, chlorides, phos-
phates, bromides and iodides. These ele-
ments are found in aerosols, detergents,
bleaches, cleaning solvents, salts, air
fresheners, paints, adhesives, and other
household products.
WARNING
!
NOTES:
Condensate trap is integral to the boiler.
Wood frame or concrete blocks may be used to
raise the boiler to maintain drain pitch or to be
above external condensate pump reservoir.
There is a 115 volt AC receptacle provided on the
control panel to provide power for an external
condensate pump (if needed).
Failure to follow these warnings could result in
re, property damage, personal injury, or death.
Locate combustion air inlet as far away as• possible from swimming pool and swim-
ming pool pump house. All combustion air
and vent pipes must be airtight and water-
tight. Combustion air and vent piping must
also terminate exactly as shown in Figures
1 and 2. If a concentric vent termination is
being used, refer to Figures 3 through 5 for
proper setup.
Vent connections serving appliances vent-• ed by natural draft shall not be connected
into any portion of mechanical draft sys-
tems operating under positive pressure.
Solvent cements are combustible. Keep•
away from heat, sparks, or open ame.
Use only in well ventilated areas. Avoid
breathing in vapor or allowing contact
with skin or eyes.
WARNING
!
V - BEFORE INSTALLING THE BOILER
3” Diameter PVC Intake/CombustionAir
Concentric Vent w/Dimensions
3” Diameter PVC Vent/Exhaust
Figure 4 - Concentric Vent w/ Dimensions

10
NOTES:
If boiler is not level condensate drain lines will 1. not function properly. Adjustable feet are lo-
cated on the boiler to make up for minor sur-
face irregularities or tilt.
Wood frame or blocks may be used to raise 2. boiler to maintain drain pitch or to be above
external condensate pump reservoir.
Removal of Existing Boiler From Common Vent
System
When an existing boiler is removed from a common vent-
ing system, the common venting system is likely to be
too large for proper venting of the appliances remaining
connected to it. At the time of removal of an existing boil-
er, the following steps shall be followed with each appli-
ance remaining connected to the common venting system
placed in operation, while the other appliances remaining
connected to the common venting system are not in op-
eration.
Seal any unused openings in the common venting
1.
system.
Visually inspect the venting system for proper size and 2.
horizontal pitch and determine there is no blockage or
restrictions, leakage, corrosion and other deciencies
which could cause an unsafe condition.
When it is practical, close all building doors and windows 3.
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. Turn on clothes
dryer and any appliance not connected to the common
venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhaust, so they will operate
at maximum speed. Do not operate a summer exhaust
fan. Close replace dampers.
Foundation Requirements
Boiler must be placed on level surface. Boiler is
NOT to be installed on carpeting.
V - BEFORE INSTALLING THE BOILER
Figure 5 - Concentric Vent Roof Installation
Condensate Drain Requirements
At the rear of the unit a ½” PVC pipe nipple with
NPT threads is provided for the attachment of the
condensate drain line. Attach the ½” PVC tee in
the parts bag to act as a vent as shown. Attach ½”
PVC from this point to either a drain or an exter-
nal condensate pump (not furnished). If the drain
level is above the condensate trap, a condensate
pump must be used. The condensate pump must
be designed for a ue gas condensate application.
The condensate drain line must be pitched down to
the oor at a minimum of ¼” per foot and must be
routed within the conditioned space to avoid freez-
ing of condensate and blockage of the drain line. If
the unit will be started immediately upon completion
of installation, prime trap by lling with water until
water is seen at the vent.
FOUND

11
VI - PLACING THE BOILER
NOTE: Refer to “Locating The Boiler” in Sec-
tion V of this manual for required clearances for
servicing and maintenance.
The boiler must be located on a surface that
can support the weight of the installed boiler.
WARNING
!
The boiler should be placed to provide the most direct
connections to the combustion air, vent and system piping
as possible.
Place crated boiler as close to selected location as possi-
ble and uncrate boiler. The uncrated boiler may be moved
V - BEFORE INSTALLING THE BOILER
Place in operation the appliance being inspected. Fol- 4.
low the lighting instructions. Adjust thermostat so appli-
ances will operate continuously.
After it has been determined that each appliance re- 5.
maining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans and any other gas-burn-
ing appliance to their previous condition of use.
Any improper operation of the common venting sys- 6.
tem should be corrected so the installation conforms
with the National Fuel Code, NFPA-54/ANSI -Z223.1-
latest revision, or section 5 of CSA-B149 for Canadian
standards. When resizing any portion of the common
venting system, the common venting system should be
resized to approach the minimum size as determined
using the appropriate tables in the National Fuel Gas
Code, NFPA-54/ANSI- Z223.1-latest revision, or sec-
tion 5 of CSA-B149 for Canadian standards.
into position with an appliance dolly or 2-wheel hand truck.
The dolly or hand truck should be inserted under the right
hand side of the boiler. It is possible to slide the boiler for
a short distance on a smooth oor or surface.

12
Copper supply and return piping must NOT be
installed directly into aluminum boiler section
castings due to galvanic corrosion between
dissimilar metals. Iron or steel bushings or
pipe nipples should be used between copper
system piping and boiler to make nal connec-
tion to boiler. Also, the use of dielectric unions
is acceptable. The packaged boiler is furnished
with iron piping where necessary for the sup-
ply and return connections.
VII - NEAR BOILER PIPING
IMPORTANT: For piping examples using the Gas-Fired Direct Vent Modulating Hot Water Boiler, see the
Piping Appendix in Section XVI of this manual.
CAUTION
!
When the installation of the boiler is for a new heating
system, rst install all of the radiation units (panels, ra-
diators, baseboard, or tubing) and the supply and return
mains. After all heating system piping and components
have been installed, make nal connection of the system
piping to the boiler.
According to code, a hot water boiler installed above ra-
diation level must be equipped with a low water cut off
device. A periodic inspection is necessary, as is ushing
of oat type devices, per low water cut off manufacturers
specic instructions. This boiler is factory equipped
with a manual reset probe-type low water cut off.
Expansion Tank & Make-up Water
Non-potable water only piped directly to
boiler. DO NOT connect drinking water to
heating system.
CAUTION
!
Determine required system ll pressure, system design
temperature, and system water content. Boiler contains
2.6 gallons (US). Size expansion tank accordingly. Consult
expansion tank manufacturer for proper sizing information.
Connect properly sized expansion tank (not furnished) as
shown in Figure 6 for diaphragm type expansion tank.
For diaphragm type expansion tanks, adjust the tank air
pressure to match the system ll pressure. Install air vent
(furnished) as shown for diaphragm type expansion tank
system only. Install make-up water connections as shown
GATE VALVE
REDUCED PRESSURE
BACKFLOW PREVENTER
FEED
WATER
PRESSURE
REDUCING VALVE
AIR SCOOP
DIAPHRAGM TYPE
EXPANSION TANK
SUPPLY PIPING
Figure 6 - Diaphragm Type Expansion Tank Piping
PRESSURE RELIEF DEVICE
Check local codes for
maximum distance
from oor.
PRESSURE RELIEF DEVICE
FLOOR
Figure 7 - Relief Valve Discharge Piping
and per local codes. If a pressure reducing valve is used,
adjust to match the system ll pressure. In connecting the
cold make-up water supply to the boiler, make sure that
clean water supply is available. When the water supply is
from a well or pump, a sand strainer should be installed
at the pump.

13
VII - NEAR BOILER PIPING
Pressure Relief Valve / Temperature Pressure Gauge
The boiler is furnished with a relief valve in the boiler parts
bag. Provide ¾” piping from the supplied relief valve to
a local oor drain, but leave an air gap between piping
and drain. No shutoff of any description shall be placed
between safety relief valve and the boiler, or on the dis-
charge pipes between such safety valve and the atmo-
sphere. Installation of the safety relief valve shall conform
to ANSI/ASME Boiler and Pressure Vessel Code, Sec-
tion IV. The manufacturer is not responsible for any water
damage. Check local codes for maximum height from dis-
charge piping to oor.
Supply & Return Lines
The packaged boiler unit is set up to receive 1¼” NPT
return piping from the rear of the unit with an option for left
or right return connections. 1¼” NPT supply piping exits
the boiler jacket at the top of the unit.
NOTE: On some boilers the circulator pump
and isolation valves are furnished in a carton
inside the boiler cabinet and can be installed
at the installer preferred location.
Condensate Drain Piping
The condensate trap is integral to the boiler. Use the sup-
plied 1/2” PVC tee, then transition to ½” pipe and ttings
for PVC condensate drain line. Condensate drain line to
be pitched down to oor drain at a minimum of ¼” per
foot.
The ½” diameter schedule 40 PVC condensate drain pip-
ing and pipe ttings must conform to ANSI standards and
ASTM D1785. Schedule 40 PVC cement and primer must
conform to ASTM D2564. In Canada, use CSA or ULC
certied schedule 40 PVC drain pipe and cement.
A condensate pump with a reservoir (not furnished)
may be used to remove condensate to a drain line
(sanitary line) above boiler if a oor drain is not avail-
able or is inaccessible.
Filling the Condensate Trap with Water
IMPORTANT: On initial start up the conden-
sate trap must be manually lled with water.
The following are the steps required to initially ll the con-
densate trap for start up, these steps are only required at
the initial start up or if maintenance requires draining of
the condensate trap:
Pour about 1 cup of cold tap water into the vent drain
1.
line using the 1/2” PVC vent tee provided with the
boiler.
Excess water should go through the overow and out
2.
through the condensate drain line. Verify proper op-
eration of the drain line (or external condensate pump
if used).
Reinstall the vent drain line.
3.
Chilled Water Piping
The boiler, when used in connection with a refrigeration
system, must be installed so the chiller medium is piped in
parallel with the boiler with appropriate valves to prevent
the chilled medium from entering the boiler.
The boiler piping system of a hot water boiler connect-
ed to heating coils located in air handling units where
they may be exposed to refrigerated air circulation must
be equipped with ow control valves or other automatic
means to prevent gravity circulation of the boiler water
during cooling cycle.

14
Connections & Terminations
For boilers connected to gas vents or chimneys, vent in-
stallations shall be in accordance with Venting Require-
ments of the National Fuel Gas Code, ANSI Z223.1-latest
revision, CSA-B149.1 and B149.2, and applicable provi-
sions of the local building codes.
Provisions for combustion and ventilation air must be
in accordance with the National Fuel Gas Code, ANSI
Z223.1-latest revision, CSA-B149.1 and B149.2, or ap-
plicable provisions of the local building code.
These boilers require a dedicated direct vent system. All
air for combustion is taken directly from outdoors through
the combustion air intake pipe. All ue products are dis-
charged to the outdoors through the vent pipe. Insulate
lengths of combustion pipe in unconditioned areas.
See Figures 1 through 5 for combustion air and vent 1.
pipe roof and sidewall termination (roof termination is
preferred). Combustion air and vent pipes must termi-
nate
together in same atmospheric pressure zone
as shown
. Construction through which vent and air
intake pipes may be installed is a maximum 24” and a
minimum ¼” thickness.
Combustion air and vent pipe ttings must conform 2.
to American National Standards Institute (ANSI) stan-
dards and American Society for Testing and Materi-
als (ASTM) standards D1784 (schedule-40 CPVC),
D1785 (schedule-40 PVC), D2665 (PVC-DWV),
D2241 (SDR-21 and SDR-26 PVC), D2661 (ABS-
DWV), or F628 (schedule-40 ABS). Pipe cement
and primer must conform to ASTM standards D2564
(PVC) or D2235 (ABS).
For Canadian installations all plastic venting material 3.
must be listed to ULC S636.
Do not use cellular core PVC for venting ue gas.
WARNING
!
Combustion air and vent pipe connections on boiler 4.
are 2” but must increase to 3”. Due to potential for ue
gas temperatures above 155°F, the rst 30” of sup-
plied vent pipe is CPVC while the remaining vent pipe
can be PVC. Any replacement of the rst 30” of vent
pipe must be made with CPVC.
NOTE: The exhaust transition from 2” pipe to
3” pipe must be made in a vertical run. Transi-
tion pieces are not included. (See Figure 8 for
details.)
Combustion and Vent Piping Length
TABLE #4 Maximum Allowable Temperatures
Of Typical Non-Metallic Vet Material
Material HDT RTI Standard
°F °C °F °C
PVC 158 70 – –
ASTM F 891 *
ASTM D2665 **
ASTM D1785 **
ASTM D2241 **
CPVC 210 100 – – ASTM D2846 ** ASTM F441 **
ASTM F442 **
ABS 180 82 – – ASTM D2661 ***
ASTM F628 ***
Radel-
A200 414 212 – – UL-1738
ULC S636
* Allowable temperatures based on Classications covered
in ASTM D4396 [Deection Temperatures under Load
(264psi) (1819 KPa)].
** Allowable temperatures based on Classications covered
in ASTM D1784 [Deection Temperatures under Load
(264psi) (1819 KPa)].
*** Allowable temperatures based on Classications covered in
AsTM D3965 [Deection Temperatures under Load(264psi)
(1819 KPa)] .
3” Pipe Min. Venting 3” Pipe Max. Venting
15 ft. equivalent length 100 ft. equivalent length
The length of pipe is counted from the end of the supplied
2” CPVC pipe exiting the boiler. The termination is not
counted in the “Total Equipment Length.” The combustion
3 INCH INTAKEAND
EXHAUSTTERMINATIONS
2” (50.8MM) CPVC
VENT PIPING
(FURNISHED &
REQUIRED)
FIELD INSTALL2” BY 3”
TRANSITION IN THE
VERTICALPOSITION ONLY
(2 REQ’D, NOT FURNISHED)
2” (50.8MM) COMBUSTIONAIR
INTAKE PIPING (FURNISHED)
Figure 8 - Combustion Air & Vent Piping
VIII - COMBUSTION AIR AND VENT PIPE

15
VIII - COMBUSTION AIR AND VENT PIPE
ture. Termination of the vent should be kept at least 3’
away from vegetation. The venting system shall termi-
nate at least 4’ horizontally from, and in no case above
or below, electric meters, gas meters, regulators, and
relief equipment, or under a deck or porch.
Through the wall vents for Category II and IV appli- 4.
ances and non categorized condensing appliances
shall not terminate over public walkways or over an
area where condensate or vapor could create a nui-
sance or hazard or could be detrimental to the op-
eration of regulators, relief vales, or other equipment.
Where local experience indicates that condensate is a
problem with Category I and III appliances, this provi-
sion shall also apply. If multiple terminations are used,
there must be a minimum of 12” between the exhaust
of one termination and the air intake of the next termi-
nation. See Figures 1-3 for illustrations.
Installation
IMPORTANT: When transitioning from CPVC to
PVC it is recommended to use Weld-On CPVC
724 or other cement approved for CPVC to PVC.
In Canada ULC S636 approved cement must be
used.
Attach combustion air intake piping to supplied 2” PVC 1.
Intake Connector. Attach vent piping to furnished 2”
CPVC vent pipe. Use a 2” x 3” adapter in both air inlet
and exhaust.
NOTE: All pipe joints are to be water tight.
Working from the boiler to the outside, cut pipe to re- 2.
quired length(s).
Deburr inside and outside of pipe, and remove all 3.
shavings from pipe.
Chamfer outside edge of pipe for better distribution of 4.
primer and cement.
Clean and dry all surfaces to be joined. 5.
Check dry t of pipe and mark insertion depth on 6.
pipe.
air supply pipe must terminate at the same location as the
exhaust pipe.
Reduce the maximum vent length by 5’ per each 90° el-
bow.
Exhaust air piping to be pitched back to boiler at
1.
minimum ¼” per foot from vent terminals so that all
moisture in vent piping drains to boiler. Pipes must be
pitched continuously with no sags or low spots where
moisture can accumulate and block the ow of ue
gas. Combustion air and vent pipes must be airtight
and watertight.
Consideration for the following should be used when
2.
determining an appropriate location for termination of
combustion air and vent piping:
Comply with all clearances required.•
Termination should be positioned where vent vapors will •
not damage plants/shrubs or air conditioning equipment.
Termination should be positioned so that it will not be ef-•
fected by wind eddy, air born leaves, snow, or recirculated
ue gases.
Termination should be positioned where it will not be •
subjected to potential damage by foreign objects, such as
stones, balls, etc.
Termination should be positioned where vent vapors are •
not objectionable.
Put vent on a wall away from the prevailing winter wind. •
Locate or guard the vent to prevent accidental contact with
people or pets.
Terminate the vent above normal snowline. Avoid loca-•
tions where snow may drift and block the vent. Ice or
snow may cause the boiler to shut down if the vent be-
comes obstructed.
Under certain conditions, ue gas will condense, form-•
ing moisture, and may be corrosive. In such cases, steps
should be taken to prevent building materials at the vent
from being damaged by exhaust of ue gas.
The venting system shall terminate at least 3’ above 3.
any forced air inlet (except boiler’s combustion air in-
let) within 10’. The venting system shall terminate at
least 12” from any air opening into any building. The
bottom of the vent shall be located at least 12” above
grade. The vent terminal shall not be installed closer
than 3’ from the inside corner of an “L” shaped struc-

16
IX - GAS SUPPLY PIPING
Check Gas Supply
The gas pipe to your boiler must be the correct size for
the length of run and for the total BTU per hour input of
all gas utilization equipment connected to it. See Table 4
for proper size. Be sure your gas line complies with local
codes and gas company requirements.
The boiler and its individual shutoff valve must be dis-
connected from the gas supply piping system during any
pressure testing of that system at test pressures in ex-
cess of ½ psig (3.5kPa).
The boiler must be isolated from the gas supply piping
system by closing its individual manual shutoff valve dur-
ing any pressure testing of the gas supply piping system at
test pressures equal to or greater than ½ psig (3.5kPa).
In order for proper operation of the boiler, it is recom-
mended that the line pressure be within the minimum and
maximum values in Table 5.
VIII - COMBUSTION AIR AND VENT PIPE
NOTE: It is recommended that all pipes be
cut, prepared, and pre-assembled before per-
manently cementing any joint.
After pipes have been cut and pre-assembled, apply 7.
cement primer to pipe tting socket and end of pipe to
insertion mark. Quickly apply approved cement to end
of pipe and tting socket (over primer). Apply cement
in light, uniform coat on the inside of socket to prevent
buildup of excess cement. Apply second coat.
NOTE: Primer and cement will discolor jacket.
Take precautions to protect jacket while cement-
ing vent pipe.
While cement is still wet, insert pipe into socket with 8.
a ¼ turn twist. Be sure pipe is fully inserted into tting
socket.
Wipe excess cement from joint. A continuous bead of
9.
cement will be visible around perimeter of a properly
made joint.
Handle pipe joint carefully until cement sets.
10.
Support combustion air and vent piping a minimum of 11.
every 5’ using pre-formed metal hanging straps. Support
combustion air and vent piping so no weight is resting on
the boiler jacket. Do not rigidly support pipes. Allow move-
ment due to expansion and contraction.
Slope combustion air and vent pipes toward boiler a 12.
minimum of ¼” per linear foot with no sags between
hangers.
Use appropriate methods to seal openings where vent 13.
and combustion air pipes pass through roof or side
wall.
TABLE 5: GAS SUPPLY PRESSURE
Natural Gas 4” min. w.c. 10” max. w.c.
LP Gas 10” min. w.c. 14” max. w.c.
Check line pressure while unit is running in high re mode.
TABLE 4: GAS PIPING SIZES
Natural Gas
Pipe Length Pipe Capacity - BTU/Hr. Input Includes Fittings
½” ¾” 1” 1¼”
20’ 92,000 190,000 350,000 625,000
40’ 63,000 130,000 245,000 445,000
60’ 50,000 105,000 195,000 365,000
LP Gas
Pipe Length
Pipe Capacity - BTU/Hr. Input Includes Fittings
Copper Tubing (O.D.) Iron Pipe
⅝” ¾” ½” ¾”
20’ 131,000 216,000 189,000 393,000
40’ 90,000 145,000 129,000 267,000
60’ 72,000 121,000 103,000 217,000
The length of pipe or tubing should be measured from the gas meter or
propane second stage regulator.

17
Connecting the Gas Piping
Refer to Figure 9 for the general layout at the boiler,
which shows the basic ttings you will need. As shipped,
the gas line enters the boiler through the right side but, as
an option, it can be routed through either the rear or left
side panel.
1/2” GAS CONNECTION
*NOTE: 3/4” GAS SUPPLY
TO BOILER JACKET
REQUIRED TO FEED
THE BOILER.
Figure 9 - Gas Piping
The boiler is equipped with a ½” NPT connection on the gas
valve for supply piping and ½” NPT ball valve for manual
shut off. The following rules apply for boiler piping:
Use only those piping materials and joining methods 1.
listed as acceptable by the authority having jurisdic-
tion, or in the absence of such requirements, by the
National Fuel Gas Code, ANSI Z223.1- latest revision.
In Canada, follow the CAN/CGA B149.1 and .2 Instal-
lation Codes for Gas Burning Appliances and Equip-
ment.
Use pipe joint compound suitable for liqueed petro- 2.
leum gas on male threads only.
Use ground joint unions.
3.
Install a sediment trap upstream of gas controls. 4.
Use two pipe wrenches when making the connection 5.
to the gas valve to keep it from turning.
Install a manual shutoff valve in the vertical pipe about
6.
5’ above oor outside the boiler jacket in addition to
the shutoff valve supplied with the boiler.
Tighten all joints securely. 7.
Propane gas connections should only be made by a 8.
licensed propane installer.
Two stage regulation should be used by the propane 9.
installer.
Propane gas piping should be checked out by the pro- 10.
pane installer.
Checking the Gas Piping
After all connections have been made, check im-
mediately for leaks. Open the manual shutoff valve.
Test for leaks by applying soap suds (or a liquid de-
tergent) to each joint. Bubbles forming indicate leak.
Correct even the smallest leak at once.
Never use a match or open ame to test for
leaks!!
WARNING
!
IX - GAS SUPPLY PIPING

18
IMPORTANT: Wiring must be N.E.C. Class
1. If original boiler wiring must be replaced,
use only type 105°C wire or equivalent. Boiler
must be electrically grounded as required by
National Electrical Code ANSI/NFPA 70 - latest
edition.
X - ELECTRICAL WIRING
IMPORTANT: Wiring diagrams for the Gas-Fired Direct Vent Modulating Hot Water Boiler can be
found in Section XIV of this manual.
For your safety, turn off electrical power
supply at service panel before making any
electrical connections to avoid possible
electric shock hazard. Failure to do so can
cause severe personal injury or death.
WARNING
!
Codes
Installations must comply with National Electrical
Code, any other national, state, provincial, or lo-
cal codes or regulations, and, in Canada, with CSA
C22.1 Canadian Electrical Code (Part 1) and any
local codes. (L1, L2)
Line Voltage Connections
Connect 120 VAC power wiring to line voltage termi- 1.
nal strip on boiler control panel.
Provide and install a fused disconnect or service 2.
switch (15 amp recommended) as required by code.
Boiler circulator is shipped loose. Wire boiler circu- 3.
lator as shown in wire diagram label on boiler side
panel. (CH L1, CH L2) CH = Control Heat
When connecting a DHW circulator, connect wiring 4.
to line voltage terminal strip on boiler control panel.
(DHW L1, DHW L2) DHW = Domestic Hot Water
Route all wires and conduits to the openings in the 5.
right jacket panel.
Low Voltage Connections
Connect low voltage wiring to low voltage terminal 1.
strip as shown in the boiler wiring diagram.
Route all low voltage wires through opening on the 2.
right jacket panel. Use shielded cable.
Thermostat
Connect room thermostat or end switch (isolated con-
1.
tact only) between terminals T1 and T2.
Install thermostat on inside wall away from inuences 2.
of drafts, hot or cold water pipes, lighting xtures, tele-
visions, sunrays, or replaces.
3. Thermostat anticipator (if applicable):
If connected directly to boiler, set for 0.1 amps.A.
If connected to relays or other devices, set to match B.
total electrical power requirements of connected
devices. See device manufacturers’ specications
and thermostat instructions for details.
Outdoor Temperature Sensor
Connect outdoor temperature sensor between termi-
1.
nals A1 and A2 to enable outdoor reset operation of
the boiler. If xed temperature operation is required,
do not install outdoor sensor.
Mount sensor on exterior wall, shielded from direct sun- 2.
light or ow of heat or cooling from other sources.
If desired, install a summer/winter switch across termi- 3.
nals A1 and A2. When the switch is closed, the boiler
(space heating) circulator is disabled.
Route sensor wires through the holes provided on the 4.
right jacket panel of the boiler.
DHW Aquastat
Connect storage indirect water heater (DHW)
aquastat between terminals DHW T1 and DHW T2.

19
XI - CONTROLS AND ACCESSORIES
This section provides a brief description of the key controls
and accessories found in this boiler. See the Repair Parts
Manual (P/N# 240006107) for illustrations and the Control
Manual and Operation Instructions (P/N# 240006104) for
a detailed sequence of operation and troubleshooting pro-
cedures.
Aluminum Heat Exchanger
This appliance employs a cast aluminum heat exchanger
that features a monoblock design. The monoblock design
eliminates the need for mating sections and therefore
eliminates leaks between sections. Since the heat ex-
changer is cast of aluminum instead of iron, it has better
heat transfer properties which in turn lead to higher ef-
ciency and cooler exhaust temperatures. These cooler
exhaust temperatures create condensation of the ue
gas, which would cause corrosion in traditional cast iron
heat exchangers.
Main Power Switch
This appliance features a main power switch located on the
display panel. The main power switch is illuminated when it
is receiving power and in the ON position. The only time that
the switch should not be illuminated once the boiler is ready
for use is when the switch is in the OFF position.
Modulating Boiler Control
This appliance incorporates an integrated modulating
control that senses the load necessary to heat a structure
and therefore uses less fuel than a conventional xed r-
ing rate boiler when there is a lower than peak demand for
heat. The control senses the supply water, return water,
and outside air temperatures if the outside air sensor is
connected and calculates the load on the system. It then
adjusts the ring rate to deliver the amount of heat that is
needed at that particular time.
NTC Sensors
The NTC sensors used with this appliance for measuring
supply water, return water, and outside air temperature
are specially congured to operate with the modulating
boiler control.
Modulating Blower
The modulating blower provides a means of introducing the
gas/air mixture through the burner and into the combustion
chamber where combustion can begin and then out the ex-
haust vent where the combustion products are discharged
to the outdoors. The blower is designed to communicate
with the modulating control to run at variable speeds de-
pendent on the heat load experienced by the heating sys-
tem. The variable speeds create pressures felt by the gas
valve and gas/air mixer that dictate how much fuel is intro-
duced to the combustion process.
Gas Control Valve
The gas controls in this boiler have been developed for
domestic heating appliances with premix burners and au-
tomatic direct burner ignition and are suitable for natural
and LP gas. The gas controls perform all the functions
required to safely regulate gas ow to the main burner of
the boiler. The gas valve is directly connected to the gas/
air mixer.
Gas/Air Mixer
The venturi design of the gas/air ensures that there is al-
ways the correct mixture of air and gas.
Modulating Burner
This burner is designed to operate over the full range of
input for this boiler. The burner can operate under normal
(blue ame) and infrared conditions.
Direct Spark Igniter (DSI)
This appliance uses a DSI to ignite the fuel/air mixture in
the combustion chamber and sense ame during opera-
tion. The DSI is a durable, reliable component that resists
breakage due to handling or inadvertent impact with other
objects.
Manual Reset Low Water Cut Off
This appliance employs a factory installed integral low
water cut off (LWCO) that has to be manually reset if there
is a low water condition. The LWCO senses water through
a probe at the top of the boiler that sends a signal through
the water to ground. If the signal is not sensed through the
ground, the LWCO enters a lockout mode that disables
the appliance. If the LWCO is in normal mode a red indi-
cator light is illuminated on the LWCO panel in the boiler.
During a low water condition, the red light goes out and
the LWCO and control reset buttons on the display panel
must be depressed to reset the LWCO.

20
XI - CONTROLS AND ACCESSORIES
Normally Closed LWCO Switch
This round button switch located next to the digital dis-
play is normally closed and spring loaded so that, when
depressed, it opens, and closes again when pressure is
removed. The switch is used as the manual reset for the
LWCO. When tripped the LWCO will remain in lockout
until the water level reaches the probe and the switch is
depressed to an open state and then released to a closed
state, which sends a signal to the LWCO to resume nor-
mal operation. The boiler control reset button must then
be pressed to reset from a low water condition. The LWCO
switch and control reset button are located on the display
panel of the boiler.
High Limit Aquastat Control
The high limit aquastat control is a redundant safety limit
control that provides a means for protecting the boiler and
heating system from unsafe operating conditions which
could damage the boiler. The aquastat is mounted in the
½” NPT control well and ¾” x ½” bushing on the top of the
front boiler section at the hot water outlet. The aquastat
is tied in with the boiler control and is factory set at 200°F
water temperature. The high limit setpoint is eld adjust-
able and may be set anywhere between 100°F and 200°F,
with the maximum high limit setpoint not exceeding 200°F.
The eld high limit setpoint adjustment for each installation
depends on heating system requirements. The aquastat
automatically resets when the boiler water temperature
decreases ten degrees below the high limit setpoint val-
ue. (Adjustable differential from 5°F to 30°F)
NOTE: Boiler operating temperature (temperature curve) is
calculated and set in the parameters of the boiler control.
Casting Temperature Safety Switch
In the event of lack of or loss of water in the boiler,
the casting temperature safety switch (230°F set-
point) installed on the top of the aluminum boiler
section behind the supply piping shuts off the boiler
by shutting off power to the boiler control and causes
a failure code to be displayed on the digital read-
out. This fault requires manual reset of the casting
temperature safety switch to restart the boiler and
the reset to be pressed on the user interface panel.
Verify that the boiler is properly lled with water and
no air is trapped in the top of the casting (check cap
Grundfos Pump Curve
Taco Pump Curve
Bell & Gossett Pump Curve