UTICA BOILERS UB90125 General instructions

installation, operation and maintenance manUal
An ISO 9001-2000 Certied Company
MEMBER: The Hydronics Institute
UB90 125-200 GAS-FIRED, DIRECT VENT,
CONDENSING, HOT WATER BOIlER
UTICA BOILERS
P.O. Box 4729
Utica, NY 13504-4729
www.uticaboilers.com
P/N 240004826U, Rev. A [10/08]

2
90 125-200 CAST ALUMINUM BOILER
INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
TABLE OF CONTENTS
I. Introduction............................................................. 2
II. Safety Symbols...................................................... 2
III. Rules For Safe Installation and Operation.............. 3
IV. Boiler Ratings and Capacities .............................. 4
V. Before Installing The Boiler ................................... 5
VI. Placing The Boiler................................................ 9
VII. Near Boiler Piping ............................................. 10
VIII. Combustion Air and Vent Pipe ......................... 13
IX. Gas Supply Piping.............................................. 15
X. Electrical Wiring .................................................. 16
XI. Controls and Accessories................................... 20
XII. Startup............................................................... 22
XIII. Checkout Procedures and Adjustments............. 26
XIV. Maintenance and Cleaning .............................. 29
XV. Detailed Sequence of Operation....................... 31
XVI. Troubleshooting ............................................... 34
XVII. Installation and Checkout Certicate .............. 43
KEEP THIS MANUAL NEAR BOILER AND
RETAIN FOR FUTURE REFERENCE.
I. INTRODUCTION
This appliance is a gas-red direct vent cast aluminum
hot water boiler. A revolutionary cast aluminum heat
exchanger means better heat transfer and thermal
storage than similarly sized cast iron boilers, which
results in higher efciency. The heating system water
absorbs large amounts of heat from the cast aluminum
heat exchanger, cooling the ue gases and causing
condensation. Sealed combustion, premix gas burner,
and low ame temperature means drastically reduced
CO and NOx emissions, which contribute to a cleaner
and healthier 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 combusts. 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 readily available PVC and
CPVC vent pipes.
II. SAFETY SYMBOLS
The following dened symbols are used throughout
this manual to notify the reader of potential hazards of
varying risk levels.
IMPORTANT: Read the following instructions
COMPLETELY before installing!
Indicates a potentially hazardous situation
which, if not avoided, could result in death,
serious injury or substantial property damage.
WARNING
!
Indicates a potentially hazardous situa-
tion which, if not avoided, could result in mi-
nor or moderate injury or property damage.
CAUTION
!
Indicates an imminently hazardous situation
which, if not avoided, will result in death, se-
rious injury or substantial property damage.
DANGER
!

3
III. RULES FOR SAFE INSTALLATION AND OPERATION
Figure #1
IMPORTANT:
Failure to follow these instructions 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.
1. Check all applicable state and local building codes and
utility company requirements before installation. This
installation must conform with these requirements
in their entirety. In the absence of these codes,
use NFPA installation codes and good industry
practice.
2. Before servicing the boiler, allow it to cool. Always
shut off any electricity and gas supply connected to
the boiler prior to servicing.
3. Inspect gas line for leaks.
4. Be certain gas input rate is correct. Overring may
result in early failure of the boiler components. This
may cause dangerous operation. Underring may
result in too much air for the pre-mix burner causing
poor or loss of combustion.
5. Never vent the products of combustion from this boiler
to an enclosed space. Always vent to the outdoors.
Never vent to another room or to inside a building.
6. Be sure there is adequate outdoor air supply to boiler
for complete combustion.
BOILER JACKETS
This appliance has been equipped for residential installations. If used for commercial applications,
any and all additional code requirements must be adhered to for installation. This may require
additional controls, including but not limited to a manual reset low water 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 ACKNOWLEDGED IN THIS MANUAL.
WARNING
!

4
7. Follow a regular service and maintenance schedule
for efcient and safe operation.
8. Keep boiler area clean of debris and free of
combustible and ammable materials.
9. Proper through-the-wall or through-the-roof
combustion venting shall be in accordance with the
III. RULES FOR SAFE INSTALLATION AND OPERATION
materials and methods described in this manual.
Installation must comply with local codes.
10. This boiler and related hot water heating systems
are not do-it-yourself items. They must be installed
and serviced by qualied professionals.
IV. BOILER RATINGS & CAPACITIES
TABLE #1 - SEA LEVEL RATINGS (NATURAL AND PROPANE GASES)
Model Input
(MBH)(1)
Heating Capacity
(MBH)(1)(2)
Net I=B=R Rating
(MBH)(1)
Shipping
Weight (lbs.)
AFUE
(2) Flue Diameter
125 125 112.5 98 284 90 2” CPVC & 3” PVC
150 150 135 117 284 90 2” CPVC & 3” PVC
175 175 157.5 137 284 90 2” CPVC & 3” PVC
200 200 180 157 284 90 2” CPVC & 3” PVC
(1) 1 MBH = 1,000 Btuh (British Thermal Units Per Hour)
(2) AFUE (Annual Fuel Utilization Efciency) and Heating Capacity is based on Department of Energy test procedure.
TABLE #2 - NATURAL GAS
Nominal Input 200,000 175,000 150,000 125,000
Vent Lengths Vent Lengths Vent Lengths Vent Lengths
Altitude Min Max Min. Max Min. Max Min. Max
0 200,000 200,000 175,000 175,000 150,000 150,000 125,000 125,000
1,000 197,000 196,500 172,400 172,200 147,800 147,400 123,500 123,000
2,000 194,000 193,000 169,800 169,400 145,600 144,800 122,000 121,000
3,000 191,000 189,500 167,200 166,600 143,400 142,200 120,500 119,000
4,000 188,000 186,000 164,600 163,800 141,200 139,600 119,000 117,000
5,000 185,000 182,500 162,000 161,000 139,000 137,000 117,500 115,000
6,000 182,000 179,000 159,400 158,200 136,800 134,400 116,000 113,000
7,000 179,000 175,500 156,800 155,400 134,600 131,800 114,500 111,000
8,000 176,000 172,000 154,200 152,600 132,400 129,200 113,000 109,000
9,000 173,000 168,500 151,600 149,800 130,200 126,600 111,500 107,000
10,000 170,000 165,000 149,000 147,000 128,000 124,000 110,000 105,000
Ratings shown are for sea level applications. The boiler automatically derates input as altitude increases.
No alterations to boiler are required for altitudes above sea level.

5
IV. BOILER RATINGS & CAPACITIES
TABLE #3 - LP GAS
Nominal Input 200,000 175,000 150,000 125,000
Vent Lengths Vent Lengths Vent Lengths Vent Lengths
Altitude Min. Max Min. Max Min. Max Min. Max
0 200,000 200,000 175,000 175,000 150,000 150,000 125,000 125,000
1,000 195,900 195,750 171,900 171,200 146,900 146,700 123,050 122,250
2,000 191,800 191,500 168,800 167,400 143,800 143,400 121,100 119,500
3,000 187,700 187,250 165,700 163,600 140,700 140,100 119,150 116,750
4,000 183,600 183,000 162,600 159,800 137,600 136,800 117,200 114,000
5,000 179,500 178,750 159,500 156,000 134,500 133,500 115,250 111,250
6,000 175,400 174,500 156,400 152,200 131,400 130,200 113,300 108,500
7,000 171,300 170,250 153,300 148,400 128,300 126,900 111,350 105,750
8,000 167,200 166,000 150,200 144,600 125,200 123,600 109,400 103,000
9,000 163,100 161,750 147,100 140,800 122,100 120,300 107,450 100,250
10,000 159,000 157,500 144,000 137,000 119,000 117,000 105,500 97,500
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
hydrostatically tested for a maximum working pressure
of 50 psig (pounds per square inch gauge) in accor-
dance with A.S.M.E. (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
(American National Standards Institute) Z21.13
standards as gas-red, direct vent, condensing,
hot water boilers.
The Heating Capacity indicates the amount of heat
available 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 assumed 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. Finned 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 allowance,
establishes a reserve for heating the volume of water
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 In-
stitute. 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 be-
fore selecting a boiler for installations having unusual
piping and pickup requirements.
V. BEFORE INSTALLING THE BOILER
Complete all of the following prior to installing the boiler.
CODES
This boiler product is a gas-red, direct vent, condens-
ing boiler and must be installed in accordance with all
applicable federal, state and local building codes in-
cluding, but not limited to the following:
United States - Installation shall conform with
National Fuel Gas Code (NFPA-54/ANSI Z223.1
- latest revision)
Canada - Installation shall be in accordance with
CSA-B149.1 and .2 installation codes.
Where required by the authority having jurisdiction, the
installation must conform to the American Society of Me-
chanical Engineers Safety Code for Controls and Safety
Devices for Automatically Fired Boilers, No.CSD-1.

6
V. BEFORE INSTALLING THE BOILER
The installation must conform to the requirements of
the authority having jurisdiction or, in the absence of
such requirements, to the National Fuel Gas Code,
ANSI Z223.1 - latest revision.
In the State of Massachusetts:
This product must be installed by a licensed plumb-•
er 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.
Installers - Follow local regulations with respect
to installation of CO (Carbon Monoxide) Detec-
tors. Follow maintenance recommendations in
this manual.
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 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.
See Section IV, “Boiler Ratings and Capacities,” for
more information.
• 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 (max. length 60’).
• Connected to a suitable venting system to remove
the hazardous products of gas combustion (max.
length 60’).
• Connected to a suitable hot water heating system.
• Supplied with a suitable electrical supply for all boil-
er motors and controls.
• Connected to a properly located thermostat or op-
erating 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 res-
ervoir at ¼” per foot (wood frame or blocks may be
used to raise boiler).
LOCATING THE BOILER
1. Select a location which is level, central to the piping
systems served and as close to the vent and air
intake terminals as possible.
2. Accessibility clearances, if more stringent (i.e. larger
clearances) than required re protection clearanc-
es, must be used for the boiler installation. Acces-
sibility clearances may be achieved with the use of
removable walls or partitions.
3. The boiler is approved for installation in closets and
on combustible oors. This boiler shall NOT be in-
stalled on carpeting.
TABLE #4 - BOILER CLEARANCES
Unit Combustible
Clearance
Accessibility, Cleaning,
and Servicing
Top 1” 8”
Left Side 8” 24”
Right Side 1” -
Base 1” -
Front 0” 24”
Back 1” -
Intake/Vent
Piping 0” -
Near Boiler Hot
Water Piping 1” -
All distances measured from the cabinet of the boiler.
4. The clearances shown in Table 4 indicate required
clearances per CSA listing. A min.. 1” clearance must
be maintained between combustible construction and
each of the right, top and back surfaces of the boiler.
A min.. 8” clearance is required on the left side, to al-
low room for the inlet air pipe. An 18” clearance must
be maintained at the front where passage is required
for cleaning or servicing, inspection or replacement
of any parts that normally may require such attention.
Allow at least 24” at the front and left side and 8” at
the top for servicing. No combustible clearances are
required to venting or combustion air intake piping.
Keep boiler area clean of debris and free of ammable
and combustible materials, liquids and vapors.
CAUTION
!

7
OVERHANG
12" MINIMUM
90°
VENT
12" SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR INTAKE
AND BOTTOM OF VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL OR
GRADE
3"
MAXIMUM
SEPARATION
18"
MAXIMUM
15"
MAXIMUM
LESS THAN 12" CLEARANCE
12"
MINIMUM
12"
MINIMUM
V. BEFORE INSTALLING THE BOILER
5. Equipment shall be installed in a location which fa-
cilitates the operation of venting and combustion air
intake piping systems as described in this manual.
6. Advise owner of boiler to keep venting and combus-
tion air intake passages free of obstructions. Both
the venting and combustion air intake piping sys-
tems connected to the outdoors must permit ow
through the piping systems without restrictions for
the boiler to operate.
7. The boiler shall be installed such that the automatic
gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during opera-
tion and service (circulator replacement, control
replacement, etc.).
8. The boiler must be located where ambient tempera-
tures (minimum possible room temperatures where
boiler is installed assuming boiler is not in opera-
tion and therefore contributes no heat to the space)
are always at or above 32°F to prevent freezing of
liquid condensate.
COMBUSTION AIR/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 discharged to outside atmosphere.
Combustion air and vent pipe connections must termi-
nate together in the same atmospheric pressure zone,
either through the roof or sidewall (roof termination
preferred). See Figures #1 and #2 for required clear-
ances.
8" MINIMUM
VERTICAL SEPARATION
BETWEEN COMBUSTION
AIR INTAKE AND VENT
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL
3'' MAXIMUM
SEPARATION
15'' MAXIMUM
COMBUSTION
AIR
12''
MIMIMUM
ROOF VENT / INTAKE TERMINATIONS
Figure #1
SIDEWALL VENT/INTAKE TERMINATIONS
Figure #2
12" OR MORE CLEARANCE
90°
BRACKET
VENT
18"
MAXIMUM
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL OR
GRADE
12" SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR INTAKE
AND BOTTOM OF VENT
12" MINIMUM
OVERHANG
3"
MAXIMUM
SEPARATION
12"
MINIMUM
12"
MINIMUM
Less Than 12” Clearance
12” or More Clearance
If the concentric vent termination is being used, refer
to Figure #3 for proper setup.
CONCENTRIC VENT TERMINATIONS
Figure #3

8
V. BEFORE INSTALLING THE BOILER
FAILURE TO FOLLOW THESE WARNINGS COULD
RESULT IN FIRE, PROPERTY DAMAGE, PERSONAL
INJURY, OR DEATH.
When vent pipe is exposed to temperatures 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 1/2”Armaex or equivalent.
In extremely cold climate areas, use 3/4”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, phosphates, bromides and iodides.
These elements are found in aerosols, detergents,
bleaches, cleaning solvents, salts, air fresheners, paints,
adhesives, and other household products.
Locate combustion air inlet as far away as possible
from swimming pool and swimming pool pump house.
All combustion air and vent pipes must be airtight and
watertight. Combustion air and vent piping must also
terminate exactly as shown in Figures #1 – #2. If a
concentric vent termination is being used, refer to Figures
#3 – #5 for proper setup.
Vent connections serving appliances vented by natural
draft shall not be connected into any portion of mechanical
draft systems 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.
COMBUSTION AIR/VENT PIPE REQUIREMENTS continued
CONCENTRIC VENT ROOF INSTALLATION
CONCENTRIC VENT
Figure #5
Figure #4
WARNING
!

9
V. BEFORE INSTALLING THE BOILER
FOUNDATION REQUIREMENTS
Boiler must be placed on level surface. Boiler is NOT
to be installed on carpeting.
NOTES:
1. If boiler is not level condensate drain lines will
not function properly. Adjustable feet are locat-
ed on the boiler to make up for minor surface
irregularities or tilt.
2. Wood frame or blocks may be used to raise
boiler to maintain drain pitch or to be above ex-
ternal condensate pump reservoir.
REMOVAL OF EXISTING BOILER FROM COMMON
VENT SYSTEM
When an existing boiler is removed from a common
venting 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 boiler, the following steps shall be followed
with each appliance remaining connected to the com-
mon venting system placed in operation, while the
other appliances remaining connected to the common
venting system are not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size
and horizontal pitch and determine there is no block-
age or restriction, leakage, corrosion or other de-
ciencies which could cause an unsafe condition.
3. When it is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the com-
mon venting system are located and other spac-
es 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 ex-
haust fan. Close re dampers.
4. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so appliances will operate continuously.
5. Test for spillage at the draft hood relief opening af-
ter 5 minutes of main burner operation. Use the
ame of a match or candle, or the smoke from a
cigarette, cigar or pipe.
6. 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 and
any other gas-burning appliance to their previous
condition of use.
7. Any improper operation of the common venting
system 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 resiz-
ing 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 part 11 in the National
Fuel Gas Code, NFPA-54/ANSI- Z223.1-latest
revision, or section 5 of CSA-B149 for Canadian
standards.
VI. PLACING THE BOILER
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
possible and uncrate boiler. The uncrated boiler may
be moved 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.
NOTE: Refer to “Locating The Boiler” in Section
V for required clearances for servicing and main-
tenance.

10
VII. NEAR BOILER PIPING
Copper supply and return piping must NOT be in-
stalled 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 connection to boiler. Also, the use of dielectric
unions is acceptable. The packaged boiler is fur-
nished with iron piping in the front boiler section for
the supply and return connections.
When the installation of the boiler is for a new heat-
ing system, rst install all of the radiation units (panels,
radiators, baseboard, or tubing) and the supply and re-
turn mains. After all heating system piping and compo-
nents have been installed, make nal connection of the
system piping to the boiler.
A hot water boiler installed above radiation level must
be equipped with a low water cut off device (included
with boiler). A periodic inspection is necessary, as is
ushing of oat type devices, per low water cut off man-
ufacturers specic instructions.
EXPANSION TANK AND MAKE-UP WATER
Determine required system ll pressure, system de-
sign temperature, and system water content. Boiler
contains 2.6 gallons (U.S.). Size expansion tank ac-
cordingly. Consult expansion tank manufacturer for
proper sizing information. Connect properly sized ex-
pansion 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 and per
local codes. If a pressure reducing valve is used, ad-
just 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 sup-
ply is from a well or pump, a sand strainer should be
installed at the pump.
PRESSURE RELIEF VALVE / TEMPERATURE
PRESSURE GAUGE
The boiler is furnished with a relief valve and temper-
ature pressure gauge in the boiler parts bag. Install
vent relief valve as shown in Figure #7. Provide ¾”
piping from the relief valve to a local oor drain, but
leave an air gap between piping and drain. No shut-
off of any description shall be placed between safety
relief valve and the boiler, or on the discharge pipes
between such safety valve and the atmosphere. In-
stallation 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.
Figure #6
Figure #7
RELIEF VALVE DISCHARGE PIPING
DIAPHRAGM TYPE EXPANSION TANK PIPING
CAUTION
!

11
VII. NEAR BOILER PIPING
SINGLE ZONE BOILER PIPING
Figure #8
Figure #9a
MULTIZONE BOILER PIPING
WITH CIRCULATORS
NOTE: When zoning with
circulators, the furnished
circulator pump should be
used as one of the zone
pumps. Each stripped end
of the electrical wires for the
circulator pump inside the
junction box should be taped
or wire nutted to prevent
short circuits. Unplug the
circulator pump wiring at the
integrated boiler control.
MULTI ZONE BOILER PIPING WITH ZONE VALVES
Figure #9b
SUPPLY AND RETURN LINES
The packaged boiler unit is set up to receive 1¼” NPT
supply and return piping from top access.
NOTE: The circulator pump and isolation valves
are furnished within a carton inside the boiler cabi-
net and can be installed at the installer preferred
location.

12
CONDENSATE DRAIN REQUIREMENTS
Condensate drain line to be pitched down to oor drain
at a minimum of ¼” per foot. An external condensate
pump (not furnished) may be used if oor drain is not
available. The condensate pump must be designed
for ue gas condensate application.
VII. NEAR BOILER PIPING
Figure #10
CONDENSATE DRAIN PIPING
NOTES:
1. Condensate trap is to be built in the eld per
Figure #10
2. Wood frame or blocks may be used to raise the
boiler to maintain drain pitch or to be above ex-
ternal condensate pump reservoir.
3. There is a 115 volt AC receptacle provided on the
service switch junction box which is located at the
boiler right side, to provide power for an external
condensate pump (if needed).
CONDENSATE DRAIN PIPING
The condensate trap is to be eld installed as previ-
ously shown in Figure #10. Provided are ½” PVC t-
tings for the condensate drain trap (assembled in the
eld). The condensate drain is to be pitched down to
the oor drain at a minimum of ¼” per foot.
The ½” diameter schedule 40 PVC condensate drain
piping and pipe ttings must conform to ANSI stan-
dards and ASTM D1785 or D2846. Schedule 40 PVC
cement and primer must conform to ASTM D2564 or
F493. 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 CONDENSATE TRAP WITH WATER
ON INITIAL START UP THE CONDENSATE
TRAP MUST BE MANUALLY FILLED WITH
WATER.
The following are the steps required to initially ll the
condensate trap for start up, these steps are only re-
quired at the initial start up or if maintenance requires
draining of the condensate trap:
1. Pour about 1 cup of cold tap water into the conden-
sate trap vent.
2. Excess water should go through the condensate
drain line. Verify proper operation of the drain line
(and external condensate pump if used).
CHILLED WATER PIPING
The boiler, when used in connection with a refrigera-
tion 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 con-
nected to heating coils located in air handling units
where they may be exposed to refrigerated air circu-
lation must be equipped with ow control valves or
other automatic means to prevent gravity circulation
of the boiler water during the cooling cycle.

13
VIII. COMBUSTION AIR AND VENT PIPE
CONNECTIONS AND TERMINATION
IMPORTANT: To prevent damage to the gas burner
and ensure proper operation of the unit, installer
must clean and remove all shavings from the inte-
rior of all PVC pipe used on the air intake.
For boilers connected to gas vents or chimneys, vent
installations shall be in accordance with part 7, Vent-
ing of Equipment, of the National Fuel Gas Code, ANSI
Z223.1-latest revision, CSA-B149.1 and B149.2, and
applicable provisions of the local building codes.
Provisions for combustion and ventilation air must be
in accordance with section 5.3, Air For Combustion
and Ventilation, of the National Fuel Gas Code, ANSI
Z223.1-latest revision, CSA-B149.1 and B149.2, or
applicable 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 prod-
ucts are discharged to the outdoors through the vent
pipe.
1. See Figures #1 – #2 in Section V, “Combustion Air
and Vent Pipe Requirements,” for standard two-pipe
roof and sidewall terminations and Figures #3 – #5
(same section) for concentric vent terminations (roof
termination is preferred). Combustion air and vent
pipes must terminate together in same atmospher-
ic pressure zone as shown. Construction through
which vent and air intake pipes may be installed is a
minimum ¼” and maximum 24” thickness.
2. Combustion air and vent pipe ttings must conform
to one of the following American National Standards
Institute (ANSI) and American Society for Testing and
Materials (ASTM) standards:
• D1784 (schedule-40 CPVC)
• D1785 (schedule-40 PVC)
• D2665 (PVC-DWV)
• D2241 (SDR-21 and SDR-26 PVC)
• D2661 (ABS-DWV)
• F628 (schedule-40 ABS).
Pipe cement and primer must conform to ASTM stan-
dards D2564 (PVC) or D2235 (ABS).
In Canada construct all combustion air and vent pipes
for this unit of CSA or ULC certied schedule-40
CPVC, schedule-40 PVC, PVC-DWV or ABS-DWV
pipe and pipe cement. SDR pipe is NOT approved in
Canada.
For Canadian installations all plastic venting material
must be listed to ULC S636.
3. Combustion air and vent piping connections on
boiler are 2”, but must increase to 3”. Due to po-
tential for ue gas temperatures over 155°F, the
rst 5 feet of vent pipe must be CPVC (furnished),
the remaining vent pipe can be PVC. If any el-
bows are employed within the rst 2 ½’ of vent,
they must be CPVC. Two 30” pieces of 2” CPVC
pipe and one 2” CPVC coupling are furnished with
the boiler. (Figure #11)
Figure #11
Combustion Air & Vent Piping
3 in. Pipe
Minimum Venting
3 in. Pipe
Maximum Venting
6 ft. in length plus four (4)
90° elbows
60 ft. in length and up to
four (4) 90° elbows
NOTE: The exhaust transition from 2” pipe to 3”
pipe must be made in a vertical run. (Transition
pieces not included.)
The length of pipe is counted from the boiler jacket
(air intake pipe) or from vent tee (vent pipe). The rst
ve feet of “Total Equivalent Length” of vent pipe must
be CPVC.
Reduce the maximum vent length 5 feet per each ad-
ditional elbow.

14
4. Combustion air and vent piping to be pitched back to
boiler at minimum ¼” per foot from intake and vent
terminals so that all moisture in combustion air and
vent piping drains to boiler. Pipes must be pitched
continuously with no sags or low spots where mois-
ture can accumulate and block the ow of air or ue
gas. Combustion air and vent pipes must be airtight
and watertight.
5. Consideration for the following should be used when
determining an appropriate location for termination
of combustion air and vent piping:
• Comply with all clearances required as stated
in paragraph 6 (below)
• Termination should be positioned where vent
vapors will not damage plants/shrubs, air con-
ditioning equipment, or siding on the house.
• Termination should be positioned so that it will
not be effected 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 for-
eign 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 pre-
vent accidental contact with people or pets.
• Terminate the vent above normal snowline.
Avoid locations where snow may drift and
block the vent. Ice or snow may cause the
boiler to shut down if the vent becomes ob-
structed.
• Under certain conditions, ue gas will con-
dense, forming moisture, and may be corro-
sive. In such cases, steps should be taken
to prevent building materials at the vent from
being damaged by exhaust of ue gas.
6. The venting system shall terminate at least 3 feet
above any forced air inlet (except the boiler’s com-
bustion air inlet) within 10 feet. The venting sys-
tem shall terminate at least 12 inches from any air
opening into any building. The bottom of the vent
shall be located at least 12 inches above grade.
Termination of the vent shall be not less than 7 feet
above an adjacent public walkway. The vent termi-
nal shall not be installed closer than 3 feet from the
inside corner of an L shaped structure. Termination
of the vent should be kept at least 3 feet away from
VIII. COMBUSTION AIR AND VENT PIPE
vegetation. The venting system shall terminate at
least 4 feet horizontally from, and in no case above
or below electric meters, gas meters, regulators,
and relief equipment.
If multiple terminations are used, there must be a
minimum of 12 inches between the exhaust of one
termination and the air intake of the next termina-
tion. See Figures #1 – #3 in Section E5 for illustra-
tions.
NOTE: All eld installed vent pipe must be 3”.
INSTALLATION
1. Attach combustion air intake piping to supplied
Fernco 2” coupling on CVI gas valve. Attach vent
piping to furnished 2” CPVC vent tee on draft in-
ducer outlet.
NOTE: All pipe joints are to be water tight.
2. Working from the boiler to the outside, cut pipe to
required length(s).
3. Deburr inside and outside of pipe. Remove all chips
and shavings.
4. Chamfer outside edge of pipe for better distribution
of primer and cement.
5. Clean and dry all surfaces to be joined.
6. Check dry t of pipe and mark insertion depth on
pipe.
NOTE:It is recommended that all pipes be cut,
prepared, and pre-assembled before permanently
cementing any joint.
7. After pipes have been cut and pre-assembled, ap-
ply cement primer to pipe tting socket and end of
pipe to insertion mark. Quickly apply approved ce-
ment 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.
8. While cement is still wet, insert pipe into socket with
a ¼ turn twist. Be sure pipe is fully inserted into t-
ting socket.
9. Wipe excess cement from joint. A continuous bead
of cement will be visible around perimeter of a
properly made joint.

15
VIII. COMBUSTION AIR AND VENT PIPE
10. Handle pipe joint carefully until cement sets.
11. Support combustion air and vent piping a minimum
of every 5 feet using pre-formed metal hanging
straps. Do not rigidly support pipes. Allow for move-
ment due to expansion and contraction.
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 Tables #6A & #6B for proper size. Be sure your
gas line complies with local codes and gas company
requirements.
TABLE #5 - GAS SUPPLY PRESSURE
Pressure Natural Gas Propane Gas
Minimum 4” w.c. 10” w.c.
Maximum 10” w.c. 14” w.c.
Please check line pressure while unit is running.
TABLE #6A - NATURAL GAS PIPING SIZES
Pipe
Length
Pipe Capacity - BTU/Hr. Input (1)
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
TABLE #6B - PROPANE GAS PIPING SIZES
Pipe
Length
Pipe Capacity - BTU/Hr. Input (1)
Copper Tubing (2) 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
(1)Includes Fittings (2)Outside Diameter
12. Slope combustion air and vent pipes toward boiler
a minimum of ¼” per linear foot with no sags be-
tween hangers.
13. Use appropriate methods to seal openings where
vent and combustion air pipes pass through roof
or side wall.
NOTE: Rigid supports will cause excess noise in vent piping.
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 excess of ½ psig (3.5kPa).
IMPORTANT: The length of pipe or tubing should
be measured from the gas meter or propane second
stage regulator.
CONNECTING THE GAS PIPING
Refer to Figure #12 for the general layout at the boil-
er. The gas line enters the boiler through the left side
panel.
The boiler is equipped with a ½” NPT connection on
the gas valve for supply piping and ½” NPT ball cock
for manual shut off. The following rules apply:
1. Use only those piping materials and joining meth-
ods listed as acceptable by the authority having ju-
risdiction, 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 Installation Codes for Gas Burning
Appliances and Equipment.
Figure #12
GAS PIPING

16
2. Use pipe joint compound suitable for liqueed pe-
troleum gas on male threads only.
3. Use ground joint unions.
4. Install a sediment trap upstream of gas controls.
5. Use two pipe wrenches when making the connec-
tion to the gas valve to keep it from turning.
6. Install a manual shutoff valve in the vertical pipe
about 5 feet above oor outside the boiler jacket.
7. Tighten all joints securely.
8. Propane gas connections should only be made by
a licensed propane installer.
9. Two stage regulation should be used by the pro-
pane installer.
IX. GAS SUPPLY PIPING
CONNECTING THE GAS PIPING continued
Never use a match or open ame to test for leaks.
10. Propane gas piping should be checked out by the
propane installer.
11. It is recommended to use a ½” union suitable for
natural and propane gas after the ball cock to fa-
cilitate service on the unit.
CHECKING THE GAS PIPING
After all connection have been made, check immedi-
ately for leaks. Open the manual shutoff valve. Test for
leaks by applying soap suds (or a liquid detergent) to
each joint. Bubbles forming indicate leak. CORRECT
EVEN THE SMALLEST LEAK AT ONCE.
X. ELECTRICAL WIRING
Turn off electrical power at fuse box before
making any line voltage connections. Follow
local electrical codes.
All electrical work must conform to local codes as well
as the National Electrical Code, ANSI/NFPA-70, latest
revision. In Canada, electrical wiring shall comply with
the Canadian Electrical Codes, CSA-C22.1 and .2.
ELECTRIC POWER SUPPLY
Prior to making any line voltage connections, service
switch at boiler should be in the off position and the
power turned off at the fuse box.
Run a 120 volt circuit from a separate over current pro-
tection device in the electrical service entrance panel.
NOTE: Use copper conductors only.
This should be a 15 ampere circuit. A service switch
has been pre-wired and located on the exterior boiler
jacket. See Figure #13 for diagram showing loca-
tion of service switch junction box and power supply
connection points. Connect black (hot) lead from the
power supply to either of the unused brass screws on
the service switch. Connect the white (neutral) lead
from the power supply to the white screw on the ser-
vice switch. Connect the green (ground) lead from the
Figure #13
WARNING
!
WARNING
!

17
X. ELECTRICAL WIRING
AVOID THE FOLLOWING
Dead Spots
Corners
Alcoves
Behind doors
Cold Spots
Concealed pipes or ducts
Stairwells - drafts
Unheated rooms on the other side
of the wall
Hot Spots
Concealed pipes
Fireplaces
TVs or radios
Lamps
Direct sunlight
Kitchens
Locate the thermostat about ve feet above the oor
on an inside wall. It may be mounted directly on the
wall or on a vertical mounted outlet box. It should be
sensing average room temperature.
Set heat anticipator at 0.7 amps. Connect 24 volt ther-
mostat leads to the two (2) yellow wires located in
service switch junction box, located on outer jacket of
boiler. See Figure #13 for service switch junction box
and thermostat eld wiring connections.
CONNECT CIRCULATOR PUMP WIRING
See Figures #14A & #14B (following page) for ser-
vice switch junction box and circulator pump eld wir-
ing connections. If the two 120 volt circulator wire
terminals inside the junction box are not used, please
leave the two wire nuts to prevent the short circuit.
power supply to the ground (green) screw on the ser-
vice switch. The receptacle on the service switch is
always powered regardless of whether the switch is
on or off, and could be used as a power supply for an
external condensate pump if one is used.
The boiler, when installed, must be electrically ground-
ed in accordance with the requirements of the author-
ity having jurisdiction or, in the absence of such re-
quirements, with the National Electrical Code, ANSI/
NFPA-70, latest revision. In Canada, electrical wir-
ing shall comply with the Canadian Electrical Codes,
CSA-C22.1 and .2.
Run a 14 gauge or heavier copper wire from the boiler
to a grounded connection in the service panel or a
properly driven and electrically grounded ground rod.
INSTALLING THE THERMOSTAT
The thermostat location has an important effect on the
operation of your boiler system. BE SURE TO FOL-
LOW THE INSTRUCTIONS INCLUDED WITH YOUR
THERMOSTAT. Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause improper
and dangerous operation. VERIFY PROPER
OPERATION AFTER SERVICING.
CAUTION
!

18
X. ELECTRICAL WIRING
2
3
G
W
3
2
Y
1
BK
1
BK
G
W
(PS-122)
LWCO
Y
W
G
Y
BK
ON/OFF SWITCH
NEUTRAL (L2)
HOT (L1)
GROUND
W
24V THERMOSTAT
60 HZ, 1 Ø
120 VAC
R
PUMP
CIRCULATOR
COMMON
W
VAC
120
24 VAC
Y
EAEF03801
TRANSFORMER
CONTROL
BK
GAS VALVE
RECTIFIER PLUG
Y
2
DIAGNOSTIC INDICATOR LIGHTS
FLAME
VALVE
IGNITOR
PURGE
POWER
R
R
R
G
R
120VAC
321P7
IGNITER
TO
CASTING
2
1
BLOWER
BLOWER
P10
G
3
W
2
BK
1
TRANSFORMER
PRIMARY
R
R
32P1
1
1
P6
BLOWER
G
2
431P5
W
BK
CASTING TEMPERATURE SAFETY SWITCH (MANUAL RESET)
BR
BL
W
V
BR
SET AT
+ 3.5" WC
SWITCH (N.C.)
AIR PRESSURE
DIFFERENTIAL
CONTROL
HI LIMIT
AQUASTAT
SET AT
+ 0.5" WC
BL
BR
AIR PRESSURE
DIFFERENTIAL
SWITCH (N.O.)
V
CIRCULATOR
2
431P4
9
3 6 Y
24 VAC
SECONDARY
TRANSFORMER
147
85
2
BR CONTROL
P3
12
V
1
3
P2
Y
2Y
1
1013-10 INTEGRATED BOILER CONTROL
W
BK
(NOTE: USE COPPER CONDUCTORS ONLY)
Figure #14A
SCHEMATIC WIRING CONNECTIONS
NOTE: If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 150°C
Thermoplastic wire or its equivalent.

19
X. ELECTRICAL WIRING
Figure #14B
LWCO
(PS-122)
HIGH LIMIT
FLAME
P3-4
THERMOSTAT
P3-7
RW
P3-9
1013-10 CONTROL
P1-2
CONTROL
AQUASTAT
P3-3
P3-6
P3-1
(MANUAL RESET)
SAFETY SWITCH
CASTING TEMPERATURE
+ 0.5" WC
1
3
AIR PRESSURE
SWITCH (N.O.)
SET AT
2
DIFFERENTIAL
1
P2-1
INDICATOR LIGHTS
IGNITER
VALVE
POWER
PURGE
LOGIC & TIMERS
ELECTRONIC
MICROPROCESSOR
4K
2K
1K
3K
5K
GAS VALVE
4K1 3K1 P3-5
24 VAC
45
P2-2
P3-2
BLOWER
P5-1
1K1 P10-1
2K1
P7-1
P4-1
TRANSFORMER
P1-1
120 VAC
3
P1-3
1
HOT SURFACE IGNITER
P12-1P6-1
5K1 P12-2 5K2
P6-2
P10-3
CIRCULATOR FIELD WIRED P5-3P10-2
P7-3
P4-3
P7-2
(NOTE: USE COPPER CONDUCTORS ONLY)
ON/OFF BLK
HOT
L1
WHT
L2
SWITCH
120 VOLT POWER SUPPLY
LADDER WIRING DIAGRAM
NOTE: If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 150°C
Thermoplastic wire or its equivalent.

20
XI. CONTROLS AND ACCESSORIES
This section provides a brief description of the key
controls and accessories found in this boiler.
See Section XVII, “Troubleshooting,” in this installa-
tion manual for detailed sequences of operation and
troubleshooting procedures. See the separately pro-
vided “Repair Parts Manual” for locations of all control
components and accessories described.
INTEGRATED BOILER CONTROL (IBC)
The Integrated Boiler Control (IBC) is a microproces-
sor based controller for high efciency gas boilers that
monitors all safety controls and which controls the op-
eration of the combustion air blower, circulator pump,
burner, and a combination hot surface igniter/ame
sensor. This controller is not intended for use with a
vent damper. This controller is mounted on the control
panel inside the boiler and contains ve diagnostic in-
dicator lights.
GAS CONTROL VALVE
The electronic 24 volt gas control valve contains a 1:1
gas/air pressure regulator to control gas ow to the main
burner of the appliance, is suited for both natural and LP
gas, and is rated in accordance with ANSI Z21.21 - lat-
est revision and CGA-6.5-M95.
HOT SURFACE IGNITER
The 120 volt hot surface igniter heats up to 1800°F to
initiate combustion of the gas in the burner. The igniter
is mounted next to the burner through the gas/air mix-
er. The igniter also serves as a means for proving the
main burner ame by ame rectication. In the event of
GAS VALVE
Figure #15
a lack of ame signal on three consecutive trials for ig-
nition, the IBC will lock out. The “Valve” and “Flame” di-
agnostic indicator lamps (see Figure #16) will blink in-
dicating the failure mode as a lack of ame signal. The
IBC is manually reset from lockout by either removing
and reestablishing the thermostat’s call for heat, or by
turning the service switch off, then back on.
Figure #16
INDICATOR LIGHTS
NOTE: The maximum setpoint of the aquastat
must not exceed 200°F.
HIGH LIMIT AQUASTAT CONTROL
The high limit aquastat control determines the maximum
boiler water temperature and also provides a means for
protecting the boiler and heating system from unsafe op-
erating 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 IBC and
is factory set at 180°F water temperature. The high limit
setpoint is eld adjustable and may be set anywhere
between 100°F and 200°F. The eld setpoint adjust-
ment for each installation depends on heating system
requirements. The aquastat automatically resets when
the boiler water temperature drops 20°F below the set-
point value. This reset value can be eld adjusted within
a range of 5-30°F.