UTICA BOILERS UB90125 Instruction manual

P/N 240009432 Rev. D [09/2013]
UB90125-200SERIESII
GAS-FIRED, DIRECT VENT,
CONDENSING, HOT WATER BOILER
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
An ISO 9001-2008 Certified Company
Models
UB90-125
UB90-150
UB90-175
UB90-200
Manufactured by:
ECR International, Inc.
2201 Dwyer Avenue, Utica NY 13504-4729
web site: www.ecrinternational.com

2
1 - Boiler Ratings & Capacities...................... 3
2 - Safe Installation And Operation ............... 5
3 - Locating The Boiler ................................ 6
4 - Near Boiler Piping.................................. 8
5 - Water Chemistry & Antifreeze Guidelines....13
6 - Combustion Air/ vent Requirements ........15
7 - Combustion Air And Vent Pipe ................17
8 - Gas Supply Piping.................................21
9 - Electrical Wiring ...................................22
10 - Controls And Accessories .....................26
11 - Startup..............................................28
12 - Detailed Sequence Of Operation............31
13 - Sequence Of Operation Diagnostics.......34
14 - Checkout Procedure & Adjustments.......36
15 - Troubleshooting..................................38
16 - Maintenance And Cleaning ...................48
TABLE OF CONTENTS
Safety Symbols & Warnings
The following dened symbols are used throughout this
manual to notify the reader of potential hazards of varying
risk levels.
NOTICE
Used to address practices not related to personal
injury.
CAUTION
Indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury.
!
WARNING
Indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
!
DANGER
Indicates a hazardous situation which, if not
avoided, WILL result in death or serious injury
!
IMPORTANT: Read following instructions COMPLETELY
before installing!!
KEEP THIS MANUAL NEAR BOILER
RETAIN FOR FUTURE REFERENCE
WARNING
Keep boiler area clear and free from combustible
materials, gasoline and other ammable vapors and
liquids.
DO NOT obstruct air openings to the boiler room.
Modication, substitution or elimination of factory
equipped, supplied or specied components may
result in personal injury or loss of life.
TO THE OWNER - Installation and service of this
boiler must be performed by a qualied installer.
TO THE INSTALLER - Leave all instructions with
boiler for future reference.
When this product is installed in the
Commonwealth of Massachusetts the installation
must be performed by a Licensed Plumber or
Licensed Gas Fitter.
!
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard. Improper installation could result in death
or serious injury. Read this manual and understand
all requirements before beginning installation.
!
20 1/8”
(511mm)
40 1/4”
(1022mm)
32 5/16”
(820mm)
25 1/4”
(641mm)
4 7/16
(113mm)
Opening for Air Vent
and Expansion Tank
Connection
Standard
Supply & Return Openings
1 1/4 NPT Connections
Provided Inside Boiler
Cabinet
Junction Box for 120 VPower &
24 V Thermostat Leads
Gas Supply
Opening
(1/2” NPT)
Left Side Vent Tee
(2” CPVC)
Condensate Drain
Fitting (1/2” PVC)
Leveling Feet
Right Side Back
Vent Connection
(2” CPVC)
Combustion Air Intake
Fitting (2” PVC)
Front
Opening for Relief
Valve Discharge Pipe
6 1/4”
(199mm)

3
Table 1 - SEA LEVEL RATINGS (NATURAL AND PROPANE GASES)
Model Input
(MBH)(1) Heating Capacity
(MBH)(1)(2) Net AHRI Rating (MBH)(1) Shipping Weight (lbs.) AFUE (2)
125 125 113 98 284 90.0
150 150 134 117 284 90.0
175 175 158 137 284 90.0
200 200 180 157 284 90.0
(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.
1 -BOILER RATINGS & CAPACITIES
20 1/8”
(511mm)
40 1/4”
(1022mm)
32 5/16”
(820mm)
25 1/4”
(641mm)
4 7/16
(113mm)
Opening for Air Vent
and Expansion Tank
Connection
Standard
Supply & Return Openings
1 1/4 NPT Connections
Provided Inside Boiler
Cabinet
Junction Box for 120 VPower &
24 V Thermostat Leads
Gas Supply
Opening
(1/2” NPT)
Left Side Vent Tee
(2” CPVC)
Condensate Drain
Fitting (1/2” PVC)
Leveling Feet
Right Side Back
Vent Connection
(2” CPVC)
Combustion Air Intake
Fitting (2” PVC)
Front
Opening for Relief
Valve Discharge Pipe
6 1/4”
(199mm)
Figure 1 - Boiler Jackets
These low pressure gas-red hot water boilers are design certied by CSA International, for use with natural and propane
gases.
Boilers are constructed and hydrostatically tested for maximum working pressure of 50 psi (pounds per square inch)
in accordance with A.S.M.E. (American Society of Mechanical Engineers) Boiler and Pressure Vessel Code, Section IV
Standards for heating boilers.
Boilers are certied in accordance with ANSI (American National Standards Institute) Z21.13 standards as gas-red, direct
vent, condensing, hot water boilers.
Heating Capacity indicates amount of heat available after subtracting losses up the stack. Most of this heat is available
to heat water. Small portion is heat loss from jacket and surfaces of boiler, it is assumed this heat stays in the structure.
Net AHRI Rating represents portion of remaining heat applied to heat radiation or terminal units (i.e. Finned tube
baseboard, cast iron radiators, radiant oor, etc.). Difference between Heating Capacity and Net AHRI Rating, called piping
and pickup allowance, establishes reserve for heating volume of water in the system and offsetting heat losses from
piping. Net AHRI Ratings shown are based on piping and pickup factor of 1.15. Net AHRI Rating of boiler selected should
be greater than or equal to calculated peak heating load (heat loss) for building or area(s) served by boiler and associated
hot water heating systems. Manufacturer should be consulted before selecting boiler for installations having unusual
piping and pickup requirements.

4
1 - BOILER RATINGS & CAPACITIES
This is gas-red direct vent cast aluminum hot water boiler. Cast aluminum heat exchanger means better heat transfer
and thermal storage than similarly sized cast iron boilers, which results in higher efciency. Heating system water
absorbs large amounts of heat from cast aluminum heat exchanger, cooling ue gases and causing condensation. Sealed
combustion, premix gas burner, and low ame temperature means drastically reduced CO and NOx emissions, which
contribute to cleaner and healthier environment.
Appliance, unlike normal residential atmospheric and induced draft units, takes its combustion air directly from outdoors
(sealed combustion) and does not compete with building occupants for fresh air. Sealed combustion (also known as “direct
vent”) is safest and best way to obtain plenty of clean combustion air. Forced draft fan draws in outside combustion air to
mix with gas, which ows into pre-mix burner and combusts. Fan forces resulting ue gases from boiler unit and provides
positive removal of ue gases from building through choice of PVC, CPVC or PP vent pipes. (Refer to Table 7 page 18 for
material limitations.)
Table 3 - LP GAS
Nominal
Input 200,000 175,000 150,000 125,000
3” Vent Lengths 3” Vent Lengths 3” Vent Lengths 3” 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
Table 2 - NATURAL GAS
Nominal
Input 200,000 175,000 150,000 125,000
3” Vent Lengths 3” Vent Lengths 3” Vent Lengths 3” 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. Boiler automatically derates input as altitude
increases. No alterations to boiler are required for altitudes above sea level.

5
Boiler is equipped for residential installations. If used for
commercial applications; additional code requirements
must be adhered to. This may require additional controls,
including but not limited to manual reset low water cut off,
manual reset high temperature limit, and wiring and/or
piping modications.
1. 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/NFPA 54 and/or Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
2. Where required by authority having jurisdiction,
installation must conform to the Standard for Controls
and Safety Devices for Automatically red Boilers,
ANSI/ASME CSD-1.
3. Be certain gas input rate is correct. Over-ring may
result in early failure of boiler components; this may
cause dangerous operation. Under-ring may result in
too much air for pre-mix burner causing poor or loss of
combustion.
4. Never vent products of combustion from this boiler to
enclosed space. Always vent to outdoors. Never vent to
another room or to inside building.
5. Verify adequate outdoor air supply to boiler for
complete combustion.
6. Follow regular service and maintenance schedule for
efcient and safe operation.
7. Keep boiler area clean of debris and free from
combustible materials, gasoline and other ammable
vapors and liquids.
8. Proper through-the-wall or through-the-roof
combustion venting shall be in accordance with
materials and methods described in this manual.
Installation must comply with local codes.
9. Boiler and related hot water heating systems are
not do-it-yourself items. Installation and service by
qualied professionals are required.
2 - SAFE INSTALLATION AND OPERATION
Installers -Follow local regulations with respect to
installation of CO (Carbon Monoxide) Detectors. Follow
maintenance recommendations in this manual. See
“Maintenance And Cleaning” on page 48.
Boiler Sizing
• Verify you have selected the boiler with proper capacity
before continuing installation. AHRI Rating of boiler
selected should be greater than or equal to calculated
peak heating load (heat loss) for building or area(s) served
by boiler and associated hot water heating systems. See
“Boiler Ratings & Capacities” on page 3.
• Heat loss calculations should be based on approved
industry methods.
Considerations For Boiler Location
Before selecting boiler location, consider following.
• Supplied with correct type of gas (natural gas or
propane).
• Connected to suitable combustion air intake piping
system to supply correct amount of fresh (outdoor) air
for combustion. See “Combustion Air And Vent Pipe” on
page 15.
• Connected to suitable venting system to remove
hazardous products of gas combustion. See “Combustion
Air And Vent Pipe” on page 15.
• Connected to suitable hot water heating system.
• Supplied with suitable electrical supply for all boiler
motors and controls.
• Connected to properly located thermostat or operating
control. (Not included with boiler)
WARNING
Fire hazard. Do not install boiler on carpeting.
Failure to follow these instructions could result in
death or serious injury.
!
• Placed on level surface (DO NOT install on carpeting)
• Condensate drain line must be pitched down to oor
drain or external condensate pump with reservoir at ¼”
per foot (21 mm/m) (wood frame or blocks may be used
to raise boiler).
WARNING
Improper installation, adjustment, alteration, service
or maintenance could result in death or serious
injury.
!

6
Locating The Boiler
1. Select level location, central to piping systems served
and close to vent and air intake terminals as possible.
2. Manufacture recommended accessibility clearances, if
more stringent (i.e. larger clearances) than required
re protection clearances, must be used for boiler
installation. Accessibility clearances may be achieved
with use of removable walls or partitions.
3. Combustible clearances shown in Table 4 indicate
required clearances per CSA listing. Minimum 1”
(25 mm) clearance must be maintained between
combustible construction and each of the right, top
and back surfaces of boiler. Minimum 8” (203 mm)
clearance is required on left side, to allow room for inlet
air pipe. 18” (457 mm) clearance must be maintained
at front where passage is required for cleaning or
servicing, inspection or replacement of any parts
that normally require such attention. Allow 24” (610
mm) at front and left side and 8” (203 mm) at top for
servicing. No combustible clearances are required to
venting or combustion air intake piping.
Table 4 - BOILER CLEARANCES
Unit Combustible
Clearance Accessibility, Cleaning, and Servicing
Top 1” (25 mm) 8” (203 mm)
Left Side 8” (203 mm) 24” (610 mm)
Right Side 1” (25 mm) -
Base 1” (25 mm) -
Front 0” (0 mm) 24” (610 mm)
Back 1” (25 mm) -
Intake/Vent
Piping 0” (0 mm) -
All distances measured from boiler cabinet.
4. Keep boiler area clean of debris and free of ammable
and combustible materials, liquids and vapors.
5. Install equipment in location which facilitates operation
of venting and combustion air intake piping systems as
described in this manual.
6. Advise owner to keep venting and combustion air
intake passages free of obstructions. Both venting
and combustion air intake piping systems connected
to outdoors must permit ow through piping systems
without restrictions for boiler to operate.
7. Boiler shall be installed such that automatic gas
ignition system components are protected from water
(dripping, spraying, rain, etc.) during operation and
service (circulator replacement, condensate trap,
control replacement, etc.).
8. Boiler must be located where ambient temperatures
(minimum possible room temperatures where boiler
is installed assuming boiler is not in operation and
therefore contributes no heat to space) are always
above freezing temperature.
9. If boiler is not level condensate drain lines will not
function properly. Adjustable feet are located on boiler
to make up for minor surface irregularities or tilt.
10. Wood frame or blocks may be used to raise boiler
to maintain drain pitch or to be above external
condensate pump reservoir.
11. Provide means for condensate drainage.
3 - LOCATING THE BOILER
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 common 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 blockage
or restriction, leakage, corrosion or other deciencies
which could cause an unsafe condition.
3. In so far as is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building.
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 re dampers.
4. Place in operation appliance being inspected. Follow
lighting instructions. Adjust thermostat so appliances
operate continuously.
5. Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use ame of match
or candle, or smoke from cigarette, cigar or pipe.

7
6. After it has been determined each appliance remaining
connected to 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.
7. Any improper operation of common venting system
should be corrected so installation conforms with the
National Fuel Code, ANSI Z223.1/NFPA 54. When re-
sizing any portion of common venting system, common
venting system should be re-sized to approach
minimum size as determined using appropriate tables
in chapter 13 of the National Fuel Code, ANSI Z223.1/
NFPA 54.
Placing The Boiler
• Place boiler to provide most direct connections to
combustion air, vent, and system piping as possible.
• Place crated boiler as close to selected location as
possible and uncrate boiler.
• Move uncrated boiler into position with appliance dolly
or 2-wheel hand truck.
• Insert dolly or hand truck under right hand side of
boiler. It is possible to slide boiler for short distance on
smooth oor or surface.
3 - LOCATING THE BOILER

8
General Instructions
1. Packaged boiler is furnished with iron piping in front
boiler section for supply and return connections.
2. Install all of radiation units (panels, radiators,
baseboard, or tubing) and supply and return mains
rst, when installation of boiler is for new heating
system.
3. After installation of all heating system piping and
components; make nal connection of system piping to
boiler.
4. Hot water boiler installed above radiation level or
as required by authority having jurisdiction must be
equipped with low water cut off device (included with
boiler).
5. Periodic inspection is necessary, as is ushing of oat
type devices, per low water cut off manufacturers
specic instructions.
6. Proper water ow through any boiler is essential to
proper operation and long life. Simple single or two
zone systems with adequate ow do not require
primary secondary piping. Systems with more zones or
low ow require primary secondary piping.
4 - NEAR BOILER PIPING
Dielectric Isolation
1. Two (2) 1-1/4” X 1-1/4” female to female dielectric
isolation unions are supplied. Install dielectric isolation
unions at boiler supply line and return line. Install
isolation ttings nearest boiler prior to system piping
connections.
2. Water contaminants that cause low or high pH makes
corrosion more likely.
3. Do not install copper supply and return piping directly
into aluminum boiler section castings due to galvanic
corrosion between dissimilar metals.
4. Use iron, steel bushings or pipe connectors between
copper system piping and boiler to make nal
connection to boiler.
5. Use of dielectric unions is required, supplied with boiler,
the purpose is to electrically insulate aluminum boiler
from remainder of the system.
MAX = 4 X DIAMETER
CLOSELY - SPACED TEES
BOILER
PUMP
Figure 2 - General Primary Secondary Conguration

9
Expansion Tank And Make-Up Water
• Determine required system ll pressure, design
temperature, and water content.
• Boiler contains 2.6 gallons (U.S.). Size expansion tank
accordingly. Consult expansion tank manufacturer for
proper sizing information.
• Connect properly sized expansion tank (not furnished)
See Figure 3, for diaphragm type expansion tank.
For diaphragm type expansion tanks, adjust tank air
pressure to match 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 pressure reducing valve is used, adjust to match
system ll pressure. Verify clean water supply is
available when connecting cold make-up water supply
to boiler. When water supply is from well or pump,
install sand strainer at pump.
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!
Safety Relief Valve / Temperature Pressure Gauge
Boiler is furnished with safety relief valve and temperature
pressure gauge.
• Install safety relief valve using pipe ttings provided
with boiler. Figure 2.
• Install safety relief valve with spindle in vertical position.
• Do not install shutoff valve between boiler and safety
relief valve.
• Install discharge piping from safety relief valve.
A. Use ¾” or larger pipe.
B. Use pipe suitable for temperatures of 375°F
(191°C) or greater.
C. Individual boiler discharge piping shall be
independent of other discharge piping.
D. Size and arrange discharge piping to avoid
reducing safety relief valve relieving capacity below
minimum relief valve capacity stated on rating
plate.
E. Run pipe as short and straight as possible to
location protecting user from scalding and properly
drain piping.
F. Install union, if used, close to safety relief valve
outlet.
G. Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
H. Terminate pipe with plain end (not threaded).
4 - NEAR BOILER PIPING
Figure 3 - Relief Valve Discharge Piping
Check local codes
for maximum
distance from
oor or other
allowable safe
point of discharge
RELIEF VALVE
DISCHARGE
PIPING

10
4 - NEAR BOILER PIPING
Figure 4 - Diaphragm Type Expansion Tank Piping
Figure 5 - Single Zone Boiler Piping
DIELECTRIC UNIONS
DIELECTRIC UNIONS
DIELECTRIC UNION

11
NOTE: When zoning with
circulators, use furnished circulator
pump as one of zone pumps. Tape
or wire nut each stripped end of
electrical wire for circulator pump
inside junction box to prevent short
circuits. Unplug circulator pump
wiring at integrated boiler control.
Supply And Return Lines
Packaged boiler receives 1¼” NPT supply and return piping
from top access.
Figure 6 - Multi-zone Boiler Piping with Circulators
4 - NEAR BOILER PIPING
Figure 7 Multi Zone Boiler Piping With Zone Valves
SUPPLY TO
ZONE SERVICE
FLOW CHECK
VALVE
VALVE
RETURN FROM
ZONE SERVICE
ZONE SERVICE
VALVE
ZONES
ZONES
VALVE
VALVE
FLOW CHECK
ZONE SERVICE
VALVE
CIRCULATORS
AIR SCOOP
EXPANSION TANK
REDUCED PRESSURE
BACKFLOW PREVENTER
GATE VALVE
FEED
WATER
PRESSURE
REDUCING VALVE
CAN VENT
DIELETRIC UNION
CIRCULATOR
SUPPLY TO
ZONE SERVICE
VALVE
ZONE SERVICE
RETURN FROM
ZONE SERVICE
VALVE
VALVE
ZONES
VALVE
ZONE VALVE
ZONE SERVICE
ZONES
EXPANSION TANK
AIR SCOOP REDUCED PRESSURE
BACKFLOW PREVENTER
PRESSURE
REDUCING VALVE
FEED
WATER
GATE VALVE
PURGE VALVE
SHUT OFF VALVE
CAN VENT
DIELETRIC UNION
DIELECTRIC UNIONS
DIELECTRIC UNIONS

12
Condensate Drain Requirements
Pitch condensate drain line down to oor drain at
minimum of ¼” per foot (21mm/m). External condensate
pump (not furnished) may be used if oor drain is not
available. Condensate pump must be designed for ue gas
condensate application.
Condensate trap is proved with boiler.
1. Build condensate trap in the eld. See Figure 7.
2. Wood frame or blocks may be used to raise boiler
to maintain drain pitch or to be above external
condensate pump reservoir.
3. 115 volt AC receptacle provided on service switch
junction box which is located at boiler right side,
to provide power for external condensate pump (if
needed).
Condensate Drain Piping
• Condensate trap is to be eld installed as shown in
Figure 7.
• Provided are ½” PVC ttings for condensate drain trap
(assembled in eld).
• The ½” diameter schedule 40 PVC condensate drain
piping and pipe ttings must conform to ANSI standards
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.
• Condensate pump with reservoir (not furnished) may
be used to remove condensate to drain line (sanitary
line) above boiler if oor drain is not available or is
inaccessible
Filling Condensate Trap With Water
Manually ll condensate trap at initial start up with water
Following steps are required to ll condensate trap for
start up. Steps are only required at initial start up or if
maintenance requires draining of condensate trap:
1. Pour about 1 cup of cold tap water into condensate trap
vent.
2. Excess water will go through condensate drain line.
Verify proper operation of drain line (and external
condensate pump if used).
Chilled Water Piping
Install boiler used in connection with refrigeration system,
so chiller medium is piped in parallel with boiler with
appropriate valves to prevent chilled medium from entering
boiler.
Boiler piping system of hot water boiler connected 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 boiler water during cooling
cycle.
4 - NEAR BOILER PIPING
Figure 8 - Condensate Trap and Vent
To Exhaust Vent
(2” CPVC)
½” Adapter
Male NPT x Socket
Weld PVC Piping
1 3/8” Long
To Boiler Flue Outlet (2” CPVC)
2” Male x 2” NPT Male PVC Bushing
1/2” PVC Elbow
1/2” PVC Piping 3 3/4” Long
1/2” PVC Elbow
1/2” PVC Piping 2” Long
1/2” PVC Piping 3 3/4” Long
1/2” PVC Tee
To Condensate Drain (Field Supplied)
2” NPT Male PVC Bushing
1/2” PVC Piping 12” Long

13
5 - WATER CHEMISTRY AND GENERAL ANTIFREEZE GUIDELINES
Boiler Water Quality and Antifreeze
Water treatment and antifreeze protection must be applied
to all aluminum series high efciency gas-red boilers
using antifreeze protection.
Clean System First
• Before connecting boiler to heating system, clean
and ush system thoroughly. Verify system is free of
sediment, ux and residual boiler water additives.
• Systems having antifreeze not recommended must be
completely ushed to ensure no old antifreeze remains.
In older systems obviously discolored, murky or dirty
water; or pH reading outside acceptable range (between
7.0 and 8.0) are indications system should be cleaned
or treated. Thoroughly ush system with clean water to
remove sediment or contaminants. Sludge and iron oxide
deposits can cause rapid breakdown of inhibitors.
• Flush with clean water. If chemical cleaners are used,
use only those recommended for use with aluminum
boilers. Follow chemical cleaner manufacturer’s
instructions completely.
• DO NOT mix different manufacturer’s products.
Fill Water and Chemistry
Verify water used to ll system meets these requirements:
• System uid pH maintained between 7.0 and 8.0.
• Maintain water hardness below 7 grains hardness.
• Filling with chlorinated potable water is acceptable. DO
NOT ll boiler with water containing chlorine in excess
of 100 ppm.
• DO NOT use inhibitors or other additives that are not listed.
• Consult local water treatment specialist for
recommendations if any of above requirements is
outside stated ranges.
Eliminate System Leaks
• Continuous addition of make-up water will constantly
add oxygen to system. Eliminate all system leaks. All
system leaks must be repaired immediately.
• Verify expansion tank is operational and properly sized.
Undersized expansion tanks cause relief valve weeping
and substantial make-up water addition.
• Operation of this boiler in a system containing
signicant amounts of dissolved oxygen can cause
severe heat exchanger corrosion damage.
• This boiler is not designed for use in systems
containing regular additions of make-up water. Regular
additions of make-up water may cause severe heat
exchanger damage. System leaks may not always be
visible. Unseen system leak will become obvious if boiler
pressure decreases when make-up valve is closed.
• This boiler is designed for closed loop hydronic heat
system only. Boiler is not suitable for natural gravity
type installations, or any other open type system.
General Guidelines When Using Antifreeze
• Use only antifreeze products recommended for use with
aluminum boilers. See Table 5 page 14.
• Continuous addition of make-up water will dilute power
of antifreeze and change buffers ability to maintain pH.
• Flush old antifreeze from system. Flush boiler and
system separately.
• Do not use antifreeze unless required.
• Antifreeze must be of type as listed in this manual due
to their operational characteristics of : type 356 T6
aluminum at operating temperatures between 20°F
(-6.7°C) and 250°F (121°C).
• Always clean system prior to using antifreeze.
• Follow antifreeze manufacturer’s instructions for
use, safe handling and storage. Refer to MSDS
(Material Safety Data Sheets) provided by antifreeze
manufacturer for potential hazards and rst aid
procedures for exposure or ingestion.
• Antifreeze will raise pH of hydronic solution in heating
system above recommended level due to corrosion
inhibitors. Solution must be treated to maintain
pH within recommended level. Follow antifreeze
manufacturer’s instructions to adjust pH.
• If system leaked, adjust water and antifreeze
chemistry. To avoid damage to boiler, check pH
and chemistry of boiler solution. Consult antifreeze
manufacturer for recommendations.
• Take pH reading annually, and adjust as necessary.
Follow antifreeze/inhibitor manufacturer’s instructions
for details on how to adjust pH.
• Antifreeze solutions can break down over time.
Failure to check antifreeze chemistry on annual basis
may result in accelerated corrosion of boiler and
other system components. Consult with antifreeze
manufacturer for recommendations.
• Use of antifreeze in any boiler will reduce heating
capacity as much as 10-20%. Take into consideration
when sizing heating system, pumps and expansion
tank. Consult antifreeze manufacturer’s literature for
specic information on reduced capacity.
• Using antifreeze manufacturer’s instructions, determine
freezing temperature needed and use correct amount
of antifreeze. Never exceed 50% antifreeze by volume.
• Boiler operating pressure must remain below 15 psi
for antifreeze solutions that specify maximum of
250°F (121°C). Otherwise, increase system operating/
tank pressure to 20 psig. Refer to expansion tank
manufacturer instructions for adjusting tank
pressure.
WARNING
Fire, explosion, asphyxiation hazard. Inadequate
dielectric isolation, incorrect water treatment or
antifreeze application may cause damage to boilers
heat exchanger. Improper installation could result
in death or serious injury. Follow these instructions
completely.
!

14
Table 5 - Compatible Aluminum Antifreeze & Inhibitor Suppliers
Noburst AL Antifreeze
Noble Company
P. O. Box 350
Grand Haven, MI 49417
www.noblecompany.com
Tel: [phone]
Fax: [phone]
Rhogard Antifreeze &
Pro-Tek 922 Inhibitor*
Rhomar Water Management, Inc.
P. O. Box 229
Springeld, MO 65801
www.rhomarwater.com
Tel: [phone]
Fax: [phone]
* Pro-Tek 922 Inhibitor may be used to adjust the pH level of the hydronic system, but on occasion may not resolve the
pH issue. In these cases, ush the system and rell with untreated water and antifreeze suitable for aluminum heat
exchangers, as listed in this supplement.
Alphi-11
Hydronic Agencies, Ltd.
(Fernox North Distributor)
15363 117 Avenue
Edmonton, AB T5M 3X4
Canada
www.hydronicagencies.com
Tel: [phone]
Fax: [phone]
Fernox
www.fernox.com
Intercool NFP-30,40,50 AA
Intercool RPH-15*
Interstate Chemical
2797 Freedland Road
P.O. Box 1600
Hermitage, PA 16148-0600
www.interstatechemical.com
Tel: [phone]
Fax: [phone]
Hercules cryo-tek™-100/Al
Hercules Chemical Company, Inc.
111 South Street
Passaic, NJ 07055
www.herchem.com
Tel: [phone]
Fax: [phone]
* This product may be used to adjust pH level of hydronic system, but on occasion may not resolve pH issue. In these
cases it is recommended to ush system and rell with untreated water and new boiler manufacturer approved
antifreeze suitable for Aluminum heat exchangers.
5 - WATER CHEMISTRY AND GENERAL ANTIFREEZE GUIDELINES

15
If concentric vent termination is being used, refer to
Figure 10 for proper setup.
6 - COMBUSTION AIR/ VENT REQUIREMENTS
Figure 9 - Multiple Boiler Roof Vent/Intake
Terminations
Figure 10- Sidewall Vent/Intake Terminations
Combustion Air/Vent Pipe Requirements
Boiler requires dedicated direct vent system. 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 terminate
together in same atmospheric pressure zone, either
through roof or sidewall (roof termination preferred). See
Figures 8 and 9 for required clearances.
Venting must be as direct as possible and properly
supported.
12" (305mm)
Minimum
8" (203mm)
Minimum
15" (381mm)
Maximum
3" (76mm)
Minimum
Vent Combustion
Air
12" (305mm)
Minimum Above
Anticipated Snow Line
Vent
3" (76mm)
Minimum
Separation
12" (305mm)
Minimum From
Overhang
12" (305mm) Separation
Between Bottom of
Combustion Air Intake
And Bottom of Vent
See Snow &
Ice Page 19 Combustion Air
Vent
12" (305mm)
Minimum
Separation
Combustion Air
Figure 11- Concentric Vent Terminations
Combustion Air
1" (26mm)
Maximum
Maintain 12"
clearance above
highest anticipated
snow level or grade
* See Note
Below 36"(0.9m) Minimum
Maintain 12"(305mm)
Clearance Above Highest
Anticipated Snow Level
or Grade
Canada see page 19
12" (305mm) Minimum
*Must be less than 4" or greater than 24" Horizontal distance
between end bells of each air intake to prevent ue gas recirculation.
Overhang
• Avoid locations where
snow may drift and block
vent and combustion air.
• Ice or snow may cause
boiler to shut down if
vent or combustion air
becomes obstructed.
Vent
Combustion Air
Vent
Single Boiler
Application
Multiple Boiler
Application
Single Boiler
Application
Multiple Boiler
Application

16
6 - COMBUSTION AIR/ VENT REQUIREMENTS
Figure 12- Concentric Vent
3” Diameter PVC
Vent/Exhaust
1½” 4½” Dia.
31⅞”
A
A
B
B
C
C
D
E
F
G
G
3” Diameter PVC
Intake/Combustion Air
46¾”
Dimension 1³⁄16”
D
E
F
Dimension
MAINTAIN 12 IN.
Figure 13- Concentric Vent Roof Installation
• Combustion air must be clean outdoor air. Do not take
combustion air from inside structure because that air
is frequently contaminated by halogens, which includes
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. Typical areas
of contamination include dry cleaning facilities, swimming
pools, beauty shops, new building construction, air
conditioning equipment. For example combustion air
intake near swimming pool chemicals will damage any
condensing boiler.
• 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.
• Follow instructions in this manual for combustion air and
vent piping termination.
• Use of concentric vent termination refer to Figures 10, 11
and 12 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.
• Fully support all vent piping. Use hangers at intervals to
prevent pipe from sagging.
WARNING
Fire, explosion, asphyxiation hazard. 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. Improper installation could result
in death or serious injury. Read this manual and
understand all requirements before beginning
installation.
!
ARoof Boot/Flashing
(Field Supplied)
B
Elbow (Field Supplied)
C Support (Field Supplied)
D
Maintain 12” (305mm),
18” (457mm)
Minimum Clearance
Above Highest
Anticipated Snow
Level.
Maximum of (610mm)
Above Roof.
WARNING
Fire, asphyxiation hazard. Covering non-metallic
vent pipe and ttings with thermal insulation shall
be prohibited. Improper installation could result in
death or serious injury.
!
NOTICE
Properly support venting. Boiler is not designed to
bear weight of venting system.

17
Connections And Termination
Installation must conform to requirements of authority
having jurisdiction or, in absence of such requirements,
to the section for Air for Combustion and Ventilation of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/
or Natural Gas and Propane Installation Code, CAN/CSA
B149.1.
Installer must clean and remove all shavings from interior
of all pipes used on air intake to prevent damage to gas
burner and ensure proper operation.
Boilers require dedicated direct vent system. All air for
combustion is taken directly from outdoors through
combustion air intake pipe. All ue products are discharged
to outdoors through vent pipe. Install vent system in
accordance with instructions in this manual.
1. Figures 8 and 9 “Combustion Air and Vent Pipe
Requirements, for standard two-pipe roof and sidewall
terminations and Figures 10, 11, and 12 for concentric
vent terminations (roof termination is preferred).
Combustion air and vent pipes must terminate together in
same atmospheric pressure zone as shown. Construction
through which vent and air intake pipes may be installed
is 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:
3. Combustion air and vent piping connections on boiler
are 2”, but must increase to 3”. Due to potential for
ue gas temperatures over 155°F, rst 5 feet of vent
pipe must be CPVC (furnished), remaining vent pipe
can be PVC. This requirement is not required when
using PP. If any elbows are employed within rst 2½’
of vent, they must be CPVC. Two 30” pieces of 2” CPVC
pipe and one 2” CPVC coupling are furnished with
boiler. See Figure 13.
Length of pipe is counted from boiler jacket (air intake
pipe) or from vent tee (vent pipe). First ve feet of “Total
Equivalent Length” of vent pipe must be CPVC. This
requirement is required when using PP.
Reduce maximum vent length 5 feet per each additional
elbow.
4. Pitch horizontal combustion air and vent piping back
to boiler at minimum ¼” per foot (21mm/m) from
intake and vent terminals so all moisture in combustion
air and vent piping drains to boiler. Pitch pipes
continuously with no sags or low spots where moisture
can accumulate and block ow of air or ue gas. This
blockage may cause combustion instability, noise and
lead to nuisance control lockouts.
5. Combustion air and vent pipes must be airtight,
watertight and tested for leaks.
7 - COMBUSTION AIR AND VENT PIPE
WARNING
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel®(polypenolsulfone) in venting
system could result in death, serious injury.
!
Table 6 Combustion Air and Vent Pipe
Length Requirement
3 in. Pipe
Minimum Venting * 3 in. Pipe Maximum Venting
6 ft. (1.8 m) in length 60 ft. (18.3 m) in length and
up to four (4) 90° elbows
1 - 90° elbow = 5 ft (1.6 m)
1 - 45° elbow = 3.5 ft (1.1 m)
1- 2” x 3” adapter = 0 ft (0 m)
All eld installed vent pipe must be 3”
* Past rst 2” section provided with boiler

18
Table 7 - Combustion air and vent pipe ttings must conform with the
following:
Item Material USA Standard Canadian Standard
Exhaust
and/or
Intake
Air Pipe
and Fittings
PVC
UL1738
ULC S636
ASTM D1785
ASTM D2241
(Fittings) D2466
(Pipe & Fittings)
ULC S636
CPVC UL1738
ULC S636
F441
(Fittings) F439
(Pipe & Fittings)
ULC S636
Polypropylene (PP) UL1738
ULC S636 (Pipe & Fittings) ULC S636
Intake Air
ONLY
Pipe and Fittings
PVC ASTM D2665 (DWV) CSA B181.2
(SCH 40) CSA B137.3
ABS ASTM D3965
ASTM D2661 CSA B181.1
Pipe
Cement
And
Primer
PVC ULC S636
ASTM D2564 ULC S636 (Exhaust & Air Intake)
CSA B137.3 (Air Intake ONLY)
CSA B181.2 (Air Intake ONLY)
CPVC ULC S636
ASTM F493 ULC S636 (Exhaust & Air Intake)
CSA B137.6 (Air Intake ONLY)
CSA B181.2 (Air Intake ONLY)
ABS ASTM D2235 ULC S636 (Exhaust & Air Intake)
CSA B181.1 (Air Intake ONLY)
7 - COMBUSTION AIR AND VENT PIPE
Figure 14- Combustion Air & Vent Piping
5’ (1.5m)
Minimum
NOT REQUIRED WHEN USING PP NOT REQUIRED WHEN USING PP

19
7 - COMBUSTION AIR AND VENT PIPE
US Installation Requirements
• Venting system shall terminate at least 3 ft. (0.9m)
above any forced (mechanical) air inlet located within
10 ft. (3m) horizontally to any building.
• Venting system shall terminate minimum of 1 ft.
(0.3m) above grade or expected snow level in such a
way that it cannot be blocked by snow.
• Termination shall be not less than 7 ft. (2.1m) above
adjacent public walkway, paved driveway or sidewalk.
• Vent terminal shall not be installed closer than 3 ft.
from inside corner of L shaped structure.
• Venting system shall terminate at least 1 ft. from any
air opening (i.e. window, door, or non-mechanical inlet)
into any building.
• Vent termination should be kept at least 3 ft. away
from vegetation.
• Venting system shall terminate at least 4 ft.
horizontally from, and in no case above or below,
unless 4 ft. (1.22m) horizontal distance is maintained,
from electric meters, gas meters, regulators, and relief
equipment.
• Venting system shall not terminate where hot gases
can cause property damage, personal injury, or
where condensate may cause hazardous frost or ice
accumulations.
NOTICE
Exhaust transition from 2” pipe to 3” pipe must be
made in vertical run. (Transition pieces not included.)
6. General Installation Requirements:
A. Position termination where vent vapors will not
damage plants/shrubs, air conditioning equipment,
or siding on the house.
B. Position termination so it will not be effected by
wind eddy, air born leaves, snow, or recirculated
ue gases. For high wind location termination tees
are required.
C. Position termination where it will not be subjected
to potential damage by foreign objects, such as
stones, balls, etc.
D. Position termination where vent vapors are not
objectionable.
E. Put vent on wall away from prevailing winter wind.
Locate or guard vent to prevent accidental contact
with people or pets.
F. Avoid locations where snow may drift and block
vent. Ice or snow may cause boiler to shut down if
vent becomes obstructed.
G. Under certain conditions, ue gas will condense,
forming moisture, and may be corrosive. In such
cases, take steps to prevent building materials at
vent from being damaged by exhaust of ue gas.
• Every outside wall penetration shall be permanently
sealed to prevent entry of combustion products into
building.
• Venting that discharges ue gases perpendicular to
the adjacent wall shall be located not less than 10 ft.
(3m) horizontally or must be a minimum of 2 ft. (0.6m)
above or must be a minimum of 25 ft. (7.6m) below
from an operable opening in an adjacent building.
Canadian Installation Requirements
• Venting system shall terminate at least 6 ft. (1.8m)
away from any forced (mechanical) air inlet to any
building.
• Venting system shall terminate a minimum of 1 ft.
(0.3m) above grade or expected snow level such a way
that it cannot be blocked by snow.
• Termination shall be not less than 7 ft. (2.1m) above
adjacent public walkway, paved driveway or sidewalk
• Vent terminal shall not be installed closer than 3 ft.
from inside corner of L shaped structure.
• Vent shall not terminate within 1 ft. (0.3 m) for inputs
up to and including 100,000 Btu/hr (30kW) and 3 ft.
(0.9 m) for inputs exceeding 100,000 Btu/hr (30kW) of
window or door that can be opened in any building, of
any non-mechanical air-supply inlet to any building, or
of combustion air inlet of any other appliance.
• Venting system shall terminate at least 4 ft.
horizontally from, and in no case above or below,
unless 4 ft. (1.22m) horizontal distance is maintained,
from electric meters, gas meters, regulators, and relief
equipment.
• Venting system shall not terminate where hot gases
can cause property damage, personal injury, or
where condensate may cause hazardous frost or ice
accumulations.
• First 3 feet (900mm) of plastic venting must be readily
accessible for visual inspection.**
• Vent shall not terminate underneath veranda, porch or
deck unless,
a.The veranda, porch or deck is fully open on minimum
of two sides beneath oor, and
b.The distance between top of vent termination and the
underside of the veranda, porch or deck is greater
than 1 ft. (0.3 m).

20
Installation
1. Recommend all pipes be cut, prepared, and pre-
assembled before permanently cementing any joint.
2. Rigid supports cause excess noise in vent piping.
3. Attach combustion air intake piping to supplied 2”
coupling on CVI gas valve. Attach vent piping to
furnished 2” CPVC vent tee on draft inducer outlet.
4. All pipe joints are to be water tight.
5. Working from boiler to outside, cut pipe to required
length(s).
6. Deburr inside and outside of pipe. Remove all chips and
shavings.
7. Chamfer outside edge of pipe for better distribution of
primer and cement.
8. Clean and dry all surfaces to be joined.
9. Check dry t of pipe and mark insertion depth on pipe.
10. After pipes have been cut and pre-assembled, apply
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 inside of socket to prevent
buildup of excess cement. Apply second coat.
11. While cement is still wet, insert pipe into socket with
¼ turn twist. Be sure pipe is fully inserted into tting
socket.
12. Wipe excess cement from joint. Continuous bead of
cement will be visible around perimeter of properly
made joint.
13. Handle pipe joint carefully until cement sets.
14. Support combustion air and vent piping minimum of
every 5 feet using pre-formed metal hanging straps. Do
not rigidly support pipes. Allow for movement due to
expansion and contraction.
15. Slope combustion air and vent pipes toward boiler
minimum of ¼” per linear foot with no sags between
hangers.
16. Use appropriate methods to seal openings where vent
and combustion air pipes pass through roof or side
wall.
7 - COMBUSTION AIR AND VENT PIPE