ECR International Dunkirk Q90-200 Technical Document

Q90 125-200 GAS-FIRED DIRECT VENT
CONDENSING HOT WATER BOILER
P/N 240004826D, Rev. 1.3 [01/06]
An ISO 9001-2000 Certified Company
DUNKIRK BOILERS
85 Middle Rd.
Dunkirk, NY 14048
www.dunkirk.com
INSTALLATION MANUAL AND OPERATING INSTRUCTIONS

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Q90 125-200 CAST ALUMINUM BOILER
INSTALLATION MANUAL AND OPERATING INSTRUCTIONS
P/N# 240004826D, Rev. 1.3 [01/06] • Printed in USA • Made In USA
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 .......................................... 9
VIII. Combustion Air and Vent Pipe .................... 11
IX. Gas Supply Piping ........................................ 13
X. Electrical Wiring ............................................. 15
XI. Controls and Accessories ............................. 17
XII. Startup ......................................................... 19
XIII. Checkout Procedures and Adjustments ........23
XIV. Maintenance and Cleaning ......................... 26
XV. Detailed Sequence of Operation .................. 28
XVI. Troubleshooting .......................................... 33
XVII. Installation and Checkout Certificate ......... 40
KEEP THIS MANUAL NEAR BOILER AND
RETAIN FOR FUTURE REFERENCE.
I. INTRODUCTION
This appliance is a gas-fired 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 efficiency.
The heating system water absorbs large amounts
of heat from the cast aluminum heat exchanger,
cooling the flue gases and causing condensation.
Sealed combustion, premix gas burner, and low
flame 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 flows
into the pre-mix burner and combusts. The fan then
forces the resulting flue gases from the boiler unit
and provides a positive removal of the flue gases
from the building through inexpensive and readily
available PVC and CPVC vent pipes.
II. SAFETY SYMBOLS
The following defined symbols are used throughout
this manual to notify the reader of potential hazards
of varying risk levels.
DANGER
Indicates an imminently hazardous situation
which, if not avoided, WILL result in death or
serious injury.
WARNING
Indicates a potentially hazardous situation
which, if not avoided, COULD result in death
or serious injury.
CAUTION
Indicates a potential hazardous situation
which, if not avoided, MAY result in minor or
moderate injury. It may also be used to alert
against unsafe practices.
IMPORTANT: Read the following instructions
COMPLETELY before installing!!

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III. RULES FOR SAFE INSTALLATION AND OPERATION
WARNING
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 modifications.
The manufacturer is not responsible for any field installation changes made to a boiler installation
WHICH ARE NOT DESCRIBED OR ACKNOWLEDGED IN THIS MANUAL.
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 qualified 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. Overfiring
may result in early failure of the boiler components.
This may cause dangerous operation. Underfiring
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.
7. Follow a regular service and maintenance
schedule for efficient and safe operation.
8. Keep boiler area clean of debris and free of
combustible and flammable materials.
9. Proper through-the-wall or through-the-roof
combustion venting shall be in accordance with the
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 qualified professionals.

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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
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
IV. BOILER RATINGS & CAPACITIES
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.
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 Efficiency) and Heating Capacity is based on Department of Energy test procedure.

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These low pressure gas-fired hot water boilers are design certified by CSA International, for use with
natural and propane gases. The boilers are constructed and hydrostatically tested for a maximum work-
ing pressure of 50 psig (pounds per square inch gauge) in accordance with A.S.M.E. (American Society
of Mechanical Engineers) Boiler and Pressure Vessel Code, Section IV Standards for heating boilers.
The Boilers are certified in accordance with ANSI (American National Standards Institute) Z21.13
standards as gas-fired, 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 floor, 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 piping. The Net I=B=R Ratings shown are
based on a piping and pickup factor of 1.15 in accordance with the I=B=R Standard as published by the
Hydronics Institute. The Net I=B=R Rating of the boiler selected should be greater than or equal to the
calculated peak heating load (heat loss) for the building or area(s) served by the boiler and associated hot
water heating systems. The manufacturer should be consulted before selecting a boiler for installations
having unusual piping and pickup requirements.
V. BEFORE INSTALLING THE BOILER
Complete all of the following prior to installing the boiler.
CODES
This boiler product is a gas-fired, direct vent, con-
densing boiler and must be installed in accordance
with all applicable federal, state and local building
codes including, but not limited to the following:
United States - Installation shall conform
with National Fuel Gas Code (NFPA-54/ANSI
Z223.1 - latest 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 Soci-
ety of Mechanical Engineers Safety Code for Con-
trols and Safety Devices for Automatically Fired
Boilers, No.CSD-1.
The installation must conform to the requirements
of the authority having jurisdiction or, in the ab-
sence of such requirements, to the National Fuel
Gas Code, ANSI Z223.1 - latest revision.
Installers - Follow local regulations with re-
spect to installation of CO (Carbon Monox-
ide) Detectors. Follow maintenance recom-
mendations in this manual.
BOILER SIZING
• Check to be sure you have selected the boiler
with the proper capacity before continuing the in-
stallation. 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 pip-
ing system to supply the correct amounts of fresh
(outdoor) air for combustion (max. length 60’).
• Connected to a suitable venting system to re-
move the hazardous products of gas combus-
tion (max. length 60’).

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• Connected to a suitable hot water heating
system.
• Supplied with a suitable electrical supply for
all boiler motors and controls.
• Connected to a properly located thermostat
or operating control. (not included with boiler)
• Placed on level surface (must NOT be in-
stalled on carpeting)
• Condensate drain line must be pitched down
to floor drain or external condensate pump with
reservoir 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 fire protection
clearances, must be used for the boiler installa-
tion. Accessibility clearances may be achieved
with the use of removable walls or partitions.
3. The boiler is approved for installation in clos-
ets and on combustible floors. This boiler shall
NOT be installed on carpeting.
4. The clearances shown in Table 4 indicate re-
quired clearances per CSA listing. A min. 1” clear-
ance must be maintained between combustible
construction and each of the right, top and back
surfaces of the boiler. A min. 8” clearance is re-
quired on the left side, to allow 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 re-
quired to venting or combustion air intake piping.
5. Equipment shall be installed in a location
which facilitates the operation of venting and
combustion air intake piping systems as de-
scribed in this manual.
6. Advise owner of boiler to keep venting and
combustion air intake passages free of obstruc-
tions. Both the venting and combustion air intake
piping systems connected to the outdoors must
permit flow 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 operation and service (circulator re-
placement, control replacement, etc.).
8. The boiler must be located where ambient
temperatures (minimum possible room temper-
atures where boiler is installed assuming boiler
is not in operation and therefore contributes no
heat to the space) are always at or above 32°F
to prevent freezing of liquid condensate.
COMBUSTION AIR/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 flue
products are discharged to outside atmosphere.
Combustion air and vent pipe connections must
terminate together in the same atmospheric pres-
sure zone, either through the roof or sidewall (roof
termination preferred). See Figures 1 and 2 for re-
quired clearances.
TABLE 4 - BOILER CLEARANCES
Unit Combustible
Clearance
Accessibility, Clean-
ing, 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.
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

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If the concentric vent termination is being used, re-
fer to Figure 3 for proper setup.
CAUTION
Keep boiler area clean of debris and free of
flammable and combustible materials, vapors,
and liquids.
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WARNING
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”Armaflex or equivalent. In extremely
cold climate areas, use 3/4”Armaflex 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
fluorides, 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 flame. Use only in
well ventilated areas. Avoid breathing in vapor
or allowing contact with skin or eyes.
CONCENTRIC VENT
Figure 4
SIDEWALL VENT/INTAKE TERMINATIONS
Figure 2
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
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
ROOF
OVERHANG
12" MINIMUM
VENT MAINTAIN 12" IN. CLEARANCE
ABOVE HIGHEST ANTICIPATED
SNOW LEVEL OR GRADE
COMBUSTION AIR
1" MAXIMUM
12" MINIMUM
CONCENTRIC VENT TERMINATIONS
Figure 3

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CONCENTRIC VENT ROOF INSTALLATION
Figure 5
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 located 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 external 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 fol-
lowed 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 deficiencies 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 common venting system are located and oth-
er 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 fire dampers.
4. Place in operation the appliance being in-
spected. Follow the lighting instructions. Adjust
thermostat so appliances will operate continu-
ously.
5. Test for spillage at the draft hood relief open-
ing after 5 minutes of main burner operation. Use
the flame of a match or candle, or the smoke
from a cigarette, cigar or pipe.
6. After it has been determined that each ap-
pliance 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 vent-
ing 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.

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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 dol-
ly 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 floor or surface.
NOTE: Refer to “Locating The Boiler” in Section V for re-
quired clearances for servicing and maintenance.
VII. NEAR BOILER PIPING
Determine required system fill 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
expansion tank (not furnished) as shown in Figure 6
for diaphragm type expansion tank. For diaphragm
type expansion tanks, adjust the tank air pressure
to match the system fill pressure. Install air vent
(furnished) as shown for diaphragm type expansion
tank system only. Install make-up water connec-
tions as shown and per local codes. If a pressure
reducing valve is used, adjust to match the system
fill pressure. In connecting the cold make-up water
supply to the boiler, make sure that clean water sup-
ply is available. When the water supply 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 tem-
perature pressure gauge in the boiler parts bag. In-
stall vent relief valve as shown in Figure 7. Provide
¾” piping from the relief valve to a local floor drain,
! !
CAUTION
Copper supply and return piping must NOT be in-
stalled directly into aluminum boiler section castings
due to galvanic corrosion between dissimilar met-
als. Iron or steel bushings or pipe nipples should
be used between copper system piping and boiler
to make final connection to boiler. Also, the use of
dielectric unions is acceptable. The packaged boiler
is furnished with iron piping in the front boiler sec-
tion for the supply and return connections.
When the installation of the boiler is for a new heat-
ing system, first install all of the radiation units (pan-
els, radiators, baseboard, or tubing) and the supply
and return mains. After all heating system piping and
components have been installed, make final con-
nection 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
flushing of float type devices, per low water cut off
manufacturers specific instructions.
EXPANSION TANK AND MAKE-UP WATER
DIAPHRAGM TYPE EXPANSION TANK PIPING
Figure 6
RELIEF VALVE DISCHARGE PIPING
Figure 7

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but leave an air gap between piping and drain.
No shutoff of any description shall be placed be-
tween safety relief valve and the boiler, or on the
discharge pipes between such safety valve and the
atmosphere. Installation of the safety relief valve
shall conform to ANSI/ASME Boiler and Pressure
Vessel Code, Section IV. The manufacturer is not
responsible for any water damage.
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 fur-
nished within a carton inside the boiler cabinet and can be
installed at the installer preferred location.
CONDENSATE DRAIN REQUIREMENTS
Condensate drain line to be pitched down to floor
drain at a minimum of ¼” per foot. An external con-
densate pump (not furnished) may be used if floor
drain is not available. The condensate pump must
be designed for flue gas condensate application.
Figure 9b
MULTIZONE BOILER PIPING
WITH ZONE VALVES
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.
MULTIZONE BOILER PIPING
WITH CIRCULATORS
Figure 9a
SINGLE ZONE BOILER PIPING
Figure 8
CONDENSATE DRAIN PIPING
Figure 10
1/2" UNTHREADED
PVC PIPING
2" LONG
1/2" UNTHREADED
PVC ELBOW
1/2" UNTHREADED
PVC PIPING
3 3/4" LONG
1/2" UNTHREADED
PVC ELBOW
1/2" UNTHREADED
PVC PIPING
1 3/8" LONG
1/2" ADAPTER
MALE NPT x SOCKET WELD
PVC PIPING
1 3/8" LONG
1/2" UNTREADED
PVC TEE
1/2" UNTHREADED
PVC PIPING
3 3/4" LONG
TO CONDENSATE DRAIN
(FIELD SUPPLIED)
TO EXHAUST VENT
(2" CPVC)
TO BOILER FLUE OUTLET
(2" CPVC)
2" NPT MALE PVC BUSHING
2" UNTHREADED MALE
x 2" NPT MALE
PVC BUSHING