Saint Roch Universal SRU Series Specification sheet

Boiler Manual And Installation
Instructions for Atmospheric Venting
(See Direct Venting addendum for Direct Vent installation)
Please Read Instructions Carefully
Save for Future Reference
WARNING
If the information in this
manual is not followed
exactly, a fire or explosion
may result causing property
damage, personal injury or
loss of life.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance
• Do not touch any electric switch; do not use any
phone in your building
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you can not reach your gas supplier call the fire
department
• Installation and service must be performed by a
qualified licensed installer, service agency or the
gas supplier.
Danger
Distributed By:
QHT, INC.
3560 LAFAYETTE ROAD
BLDG. 2, UNIT A
PORTSMOUTH, NH 03801
PHONE: [phone] FAX: [phone]
Manufactured by:
SAINT ROCH S.R.L
ITALY REV. 622
Saint Roch Universal Boiler
3-6 Section Boilers
Conforms to UL Std. 726

2
Dear Customer
Thank you for buying a Saint Roch “UNIVERSAL” SERIES Boiler
The SRU series boiler with it’s triple pass design and low water content is equipped with an
upper cylindrical coil chamber to supply heat quickly to an internal coil to produce DHW, making it
truly UNIVERSAL. Saint Roch’s new SRU series boilers are lighter, contain less water and are stronger
than other tankless boilers. The Hydrolevel 3250TC “Fuel Smart” controller is designed to work in
conjunction with the DHW coil in the boiler and your space heat zones. The electronic controller
will decrease fuel consumption during periods of inactivity by controlling the burner based on
your needs and habits.
We realize that it is not possible to answer all questions about the SRU series boiler in this
manual. Reading this installation manual does not make the reader an expert in all aspects
of installation and operation of the boiler. It does not replace the need for a qualified licensed
heating contractor. We urge you to contact your installing contractor, dealer or us if you have any
question about any aspect of your boiler’s performance. We require your contractor to complete
efficiency tests using appropriate instruments and record burner performance on page 19.
The controls and accessories listed in this manual are intended to serve as guidelines
rather than specific recommendations. We realize other makes and models of the specified
devices are available and some can be used as successfully as those we specify. The installing
contractor is the best judge of a system’s specific requirements, as well as the local availability of
certain makes and models of controls and accessories. The preceding does not apply, however,
to the equipment that comes with every boiler, such as the overheat control (Hydrostat 3250)
and the pressure relief valve. The installation of the specific devices supplied with every boiler is
absolutely necessary for safe boiler operation and protection of the heating system.
All Saint Roch boilerblocks are built in accordance with the ASME boiler and pressure vessel
code and bear the “H” stamp. The SRU has a limited lifetime warranty (refer to back of manual),
a copy of which is provided with the boiler. Please fill out warranty registration information on our
web site (www.saintroch.us). Provide the boiler serial number (located on the bottom draw rod of
the boiler), date of installation and the name of your installer.
Thank you for purchasing our Saint Roch Universal Boiler. If you have questions or
comments, please don’t hesitate to contact us immediately.
Sincerely yours,
Jim Quincy
President, QHT Inc.

3
Important Information and Warnings 4,5
Homeowner Information For Gas 6
General Information 1 7
Boiler Block Assembly 2 8
Boiler Location 3 9
Installation of Boiler Trim Kit
Components 4 10,11
Tankless Coil Installation 5 12,13
Piping The Boiler 6 14
Intake Venting 7 15,16
Exhaust Venting 8 17
Common Exhaust Venting 8.1 18
Gas Venting 8.2 18
Burner Setup 9 19
Oil Burner Setup 9.1 20
Gas Burner Setup 9.2 21
Gas Line Piping 10 22
Boiler Casing Assembly 11 23
Baffle Installation 11.1 24
Wiring 12 24
Wiring Hydrostat Control 12.1 25
Oil Diagrams 12.2 26
Gas Diagrams 12.3 27
Smart Domestic Economizer 13 28
Commissioning the Boiler 14 29
Maintenance 15 29
Installer Notes 16 30
Warranty 31
Table of Contents
Section Page

4
United States installations must comply
with:
• State and local plumbing, heating and
electrical codes.
• National codes where applicable.
• Standard for Controls and Safety Devices
for Automatically Fired Boilers, ANSI/ASME
CSD-1, – latest edition, when required.
• National Electrical Code, ANSI/NFPA 70, –
latest edition and any additional national,
state or local codes.
IMPORTANT INFORMATION
Please read this page carefully.
WARNING
!
Homeowner:
• For homeowner or person responsible
for simple start-up and routine
maintenance of the system. Instructions
must be followed to assure proper
operation of your boiler.
In addition, it is your responsibility to:
• Have boiler and burner installed by a
qualified installer.
• Have boiler and burner serviced annually
by a qualified service technician.
• Review and understand start-up and
routine maintenance procedures with
qualified service technician.
• Perform routine maintenance as
described on page 29
Service Technician:
• For a qualified service technician who
has the necessary equipment to check
the boiler and system performance, and
is responsible for start-up and service of
boiler and system.
• All instructions in this manual must be
followed to assure proper operation of
this boiler.
• Annually service boiler and burner to
assure proper operation. See page 29 for
service record.
• Review and explain start-up and
routine maintenance procedures with
homeowner.
• 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.
• Modification, substitution or elimination of factory equipped, supplied or specified
components could result in death or serious injury.
• Installation or venting a boiler or any other oil appliance with improper methods or materials
mayresult in serious injury or death due to fire or to asphyxiation from poisonous gases such
as carbon monoxide which is odorless and invisible.
• Fire, Explosion, Asphyxiation, Electrical shock hazard, Flooding will result in damages such as
electrical problems, corrosion, inoperative parts, mold and other unforeseen issues which
can occur over time. Any equipment determined by a professional as damaged by a flood,
defined as excess of water or other liquid, shall be replaced. Failure to follow these directions
will result in a Hazardous Situation.
WARNING
!
WARNING
!
WARNING
!
• dizziness
• vision problems
• shortness of breath
• headache
• loss of muscle
control
• unclear thinking
• nausea
• weakness
• unconsciousness
Symptoms of CO poisoning include the following:
WARNING
!
IF ANY OF THE SYMPTOMS OCCUR, VACATE THE
PREMISES IMMEDIATELY AND CONTACT A QUALIFIED
HEATING SERVICE COMPANY, THE GAS COMPANY OR
THE FIRE DEPARTMENT.

5
Water heated to temperature for clothes washing, dish washing and other sanitizing needs can
scald and cause permanent injury.
Children, elderly, or physically handicapped persons are more likely to be permanently injured
by hot water. Never leave them unattended in bathtub or shower. Never allow small children to
use a hot water tap or draw their own bath.
If anyone using hot water in the building fits the above description, or if state laws or local codes
require certain water temperatures at hot water taps, you must take special precautions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such as an automatic mixing valve, at hot water
tap or water heater. Automatic mixing valve must be selected and installed according to
manufacturer's recommendations and instructions.
• Water passing out of drain valves may be extremely hot. To avoid injury:
• Make sure all connections are tight.
• Direct water flow away from any person.
DANGER
!
RISK OF SCALDING. Hot water will cause
third degree burns in 6 seconds at 60°C
(140°F), in 30 seconds at 54°C(130°F).
IMPORTANT
Increasing the thermostat setting above the
pre-set temperature may cause severe burns
and consume excessive energy. Hotter water
increases the risk of scald injury.
CAUTION
IMPORTANT INFORMATION
Please read this page carefully.
WARNING
!
WARNING
!

6
HOMEOWNER INFORMATION FOR GAS
TO START UP THE APPLIANCE
1. STOP! Read the safety information on the side of the boiler. DO NOT START THE BOILER
UNLESS ALL CLEANOUT DOORS ARE SECURED AND SEALED. (Skip to step 9 for oil burning
boilers)
2. Set thermostat to lowest setting
3. Turn off all electric power to the appliance
4. Do not attempt to light the burner by hand
5. Turn the manual shut off on the combination gas valve clockwise to
the off position.
6. Wait five minutes to clear out any gas. Then smell for gas, including
near the floor.
If you smell gas, STOP!
• Do not try to light any appliance
• Do not touch any electric switch; do not use any phone in your building
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
• If you can not reach your gas supplier call the fire department
7. If you don’t smell gas, go to the next step.
8. Return the manual valve on the combination gas valve to the on position by reversing
step “5”.
9. Turn on all electric power to the appliance.
10. Set thermostat to the desired setting.
11. If the burner fails to light you may press the reset button once. If the appliance will not
operate, follow the instructions “To Turn Off Gas To Appliance” and call your service technician
or gas supplier. DO NOT ATTEMPT TO START THE BURNER WHEN EXCESS GAS HAS ACCUMULATED,
WHEN THE UNIT IS FULL OF VAPOR, OR WHEN THE COMBUSTION CHAMBER IS VERY HOT.
NOTE: ALWAYS KEEP THE MANUAL FUEL SUPPLY VALVE SHUT OFF IF THE BURNER IS SHUT DOWN FOR
AN EXTENDED PERIOD OF TIME.
TO TURN OFF GAS APPLIANCE
Set the thermostat to the lowest setting.
Turn off electric power to the appliance if service is to be performed.
Turn the gas control valve to the off position.

7
1. General Information
The SRU series boilers are wet base design, sectional, cast-iron boilers for forced hot water
heating systems. The boilers are shipped pre-assembled from the factory in lengths from
three to six sections. They are designed for firing with oil or gas power burners, which are
packed separately along with the jacket and controls for shipping purposes.
When the boiler is received, check the contents to ensure that there is no shortage or
damage to any part of the boiler system. With every boiler, you should receive a boiler block,
jacket, trim kit and a burner (oil or gas).
USE ONLY THE UL LISTED BOILER COMPONENTS AND
UL/CSA LISTED OIL OR GAS BURNER COMPONENTS SUPPLIED WITH THE BOILER SYSTEM.
Product
Code
Number
of
Sections
Heating
Capacity
(MBH)
INPUT
(MBH)
Net
AHRI
Rating
Output
Length
(Inch)
Coil
Size
(GPM)
Water
Content
(gal)
Weight
(Lbs)
AFUE
Efficiency
(%)
SRU30 3 123 140 107 24.5” 3.5 11.25 337 87.1
SRU40 4 154 175 134 29.5” 4.5 14.125 425 87.1
SRU50 5 185 210 161 34.5” 5 17 509 87.2
SRU60 6 216 245 188 39.5” 5 19.875 599 87.3
All dimensions are in inches.
L 18 3/4
29 3/4
38”
21.5”
E designates ENERGY STAR compliant ratings @ 87%+ AFUE- All SRU boilers are shipped standard as Energy star compliant
H designates High output ratings @ 86%+ AFUE- To achieve high output ratings, a burner nozzle or setup change is required.(sold separately)
Product
Code
Number
of
Sections
Heating
Capacity
(MBH)
INPUT
(MBH)
Net
AHRI
Rating
Output
Length
(Inch)
Coil
Size
(GPM)
Water
Content
(gal)
Weight
(Lbs)
AFUE
Efficiency
(%)
SRU30H 3 140 161 122 24.5” 3.5 11.25 337 86.3
SRU40H 4 171 196 149 29.5” 4.5 14.125 425 86.5
SRU50H 5 208 238 181 34.5” 5 17 509 86.5
Energy Star Compliant Ratings
High Output Ratings

8
All SRU series boilers are shipped from the factory in assembled boiler blocks.
2. Boiler Block Assembly
Boiler Block Assembly:
1. Front Section
2. Rear Section
3. Intermediate Section
4. Steel Push Nipples(Top)
5. Steel Push
Nipples(Bottom)
6. Tie Rod
7. Tie Rod Nut
8. Tie Rod Washer
9. 1 1/4" Plug
10. Plug gasket
11. 1/4" X 1 1/4" Bushing
12. Boiler Swing Door
13. Upper Cleanout Plate
Insulation
14. Upper Cleanout Plate
Gasket
15. Burner Door Insulation
16. Door/Cleanout Stud
(Qty 7)
17. Burner Door Gasket
18. 3/4" Plug (Sight Hole)
19. Boiler Door Hinge (4
pieces)
20. Hinge Pin (Qty 6)
21. Boiler Body Hinge Bolts
(Qty 2)
22. Door Hinge Mounting
Bolts (Qty 2)
23. 6“ Boiler Breeching
24. Upper Cleanout Plate
25. Boiler Baffles

9
24”
FRONT
9” TOP
9”
SIDE 9”
REAR
3. Boiler location
The following are the minimum clearances to construction or combustible materials:
DANGER
The boiler must be located on a non-combustible floor. A smooth, level concrete floor
is recommended. Locate the boiler as close as possible to the chimney. If the boiler
is installed on combustible flooring, consult local authorities for proper method of
covering floor. The boiler must not be installed on carpeting.
Caution: Do not store or use flammable materials, chemicals or flammable liquids,
especially gasoline, in the vicinity of this heating appliance.
WARNING
Boiler is certified as an indoor appliance. Do not install boiler outdoors or locate where it
will be exposed to freezing temperatures. NOT FOR MOBILE HOME INSTALLATIONS
If the boiler is to be installed in a "direct vent" configuration, please refer to the
Direct Vent Addendum supplied with the Direct Vent Kit.
PROVISIONS FOR COMBUSTION AIR 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, OR APPLICABLE PROVISIONS OF THE LOCAL BUILDING
CODES.
DO NOT INSTALL THE BOILER UNTIL PROPER COMBUSTION AIR HAS BEEN ARRANGED.
Standard Installation Clearances
Above Front Sides Rear Chimney
Connector Below
24” 12” 9” 2” 9” Non
Combustible
24”
9”
2”
12”

10
4. Installation of Boiler Trim Components
USE ONLY THE ULC LISTED BOILER COMPONENTS AND UL/CSA LISTED OIL OR GAS BURNER
COMPONENTS SUPPLIED WITH THE BOILER SYSTEM.
Please refer to the figure below for Barometric Damper location for either oil or gas
and to the next page for the proper location of the trim components.
BIAS
NOTE: See Page 21 for available
gas burners in North America
SRU BOILER
1 - Hydrostat 3250TC High Limit w/LWCO 1 – ¾” Plugs
1 – Combo pressure/temp gauge 1 – ¾” 90° Elbow
1 – ¾” X 3” Nipple 1 – ¾” Electrowell
1 – 30 PSI pressure relief valve 1 – Cera-Fiber Pad
(FOR BOTTOM OF BOILER CHAMBER)
1 – ¾” Boiler drain
Trim Kit Components
(Required for Gas systems only)
WT-1 and WT-2 Trim Kits Include:
WT-1 Has 4 GPM Coil WT-2 Has 5 GPM Coil
LT “Less Tankless” Trim Kit
Uses the same components as the WT “With Tankless” Trim Kit except the Hydrostat
Controller has been changed to the Hydrolevel 3250Plus to allow for the use of an
outside sensor

11
4. Installation of Boiler Trim Components (Continued....)
1. For the SRU LT “less Tankless” boiler, Install Hydrolevel 3250Plus Electrowell in upper
left or right rear 3/4” tappings. For SRU with Coil, Use the 3/4” tapping on the front
coil plate. All tapings and joints should be sealed with piping compound. The
boiler high limit can be adjusted up to 200oF, and should be set to the desired
temperature by the installer. The differential is also adjustable between 5 and 30
degrees. It should be set as close to 30 degrees as possible to prevent short cycling
of the burner. If you are installing a Hydrostat 3250plus, screw the unit to side
panel of the boiler as close to the immersion well as possible using the tabs on the
hydrostat. Run the sensor from behind the aquastat to the immersion well and fix it
according to manufacturer’s instructions.
2. Install Pressure Relief Valve in opposite, upper rear tapping using 3” nipple and 3/4”
elbow.
3. Install 3/4” boiler drain in lower right rear tapping.
4. Install combination pressure/temperature gauge in the upper front tapping. The
gauge must be tightened using a wrench and not your hand.
5. Place the 12” x 12” Cera-fiber blanket on the floor of the combustion chamber of the
boiler
Boiler Tapping Diagram:
 Supply
 Return
 Drain
 Plug
or
PRV
Note: Non coil
installations
replace plug with
Electrowell
 Plug
 Electrowell
(Installations with Coil)
 Tridicator
Back Of BoilerFront Of Boiler
(factory installed)

12
5. Tankless Coil Installation
DANGER-SCALD HAZARD
The control supplied with this boiler is not intended to provide accurate control of the
domestic water temperature leaving the tankless heater. An installer supplied, ASSE
1017 or ASSE 1070 certified tempering valve is therefore REQUIRED as part of this boiler’s
installation.
• Select, and install tempering valve in accordance with the valve manufacturer’s
instructions and applicable local codes. In the absence of such codes follow the Uniform
Plumbing Code (IAPMO/UPC-1). Also note that additional tempering valves may be
required at the fixtures themselves.
• Adjust low limit and tempering valve to the lowest practical setting.
• Feel water before showering or bathing.
If this boiler is installed with an optional tankless heater, pipe the heater as shown in
Figure 1.1. The components in this system and their functions are as follows:
1) ASSE 1070 or ASSE 1017 Listed Tempering Valve (Required) - Like all tankless heater
equipped boilers, the control provided with this boiler is not designed to regulate the
domestic water temperature exiting the tankless heater. A tempering valve is therefore
required for domestic water temperature control. Select and install this valve in
accordance with the valve manufacturer’s instructions and applicable codes. Note that
some codes require additional tempering devices at some of the fixtures as well.
2) Flow Restrictor (Recommended) - If water is drawn from the tankless coil at a rate
in excess of the rating in Table 1.1, the temperature of the hot water may be too low to
be of use. The use of a flow restrictor will help prevent this problem by limiting the rate
at which water can pass through the tankless heater. If possible, locate this restrictor
at least 3 feet from the tankless heater inlet so that it is not subjected to excessive
temperatures when no water is flowing through the coil.
3) DHW Pressure Relief Valve (Recommended / Consult Local Codes) - Limits the
pressure in the tankless heater and piping. Use an ASME constructed valve designed
for domestic water service, such as the Watts #3L or #53L. Note that this is a pressure
relief valve, not a T&P valve. Select a valve with a pressure setting less than or equal to
the working pressure marked on the tankless coil. Pipe the discharge to a safe location
using piping the same size as the discharge connection on the valve.
4) Hose Bib Valves (Recommended) - These valves permit the tankless heater to be
periodically “backflushed” to remove sediment.
5) Globe or Ball Valve (Recommended) - Used to aid in back flushing the tankless
heater and to isolate the DHW piping if it must be serviced. In addition, the upstream
valve may be used to limit the DHW flow if necessary.
6) Unions (Required) - Tankless heaters may require periodic gasket replacement or
other maintenance which requires removal of the heater from the boiler. Install unions
anywhere in the tankless heater piping that will facilitate removal of the heater.

13
1
2
3
4
6
5
5. Tankless Coil Installation (Continued....)
When Installing the coil:
Use cross pattern tightening
Figure 1.1
100mg/l max hardness 6.5-8 PH
100 PPM or less TDS
1.5mg/l max free chlorine
Recommend flushing coil with a
compatibile coil cleaner solution
annually.
Coil cleaning and domestic water
qualtiy recommendations:
Using a 17mm Socket/wrench:
Start to tighten at spot 1, then move to
spot 2 and so on......
DO NOT OVER TIGHTEN!
NOTE: After boiler is warmed up to
temperature, retighten the nuts in the
same cross pattern.
NOTE: Recomended initial low limit
setting is 160°F

14
6. Piping The Boiler
All piping must conform to state and local codes. Page 11 shows the location
and size of the boiler tappings. It is recommended to install unions and gate valves at
the inlet and outlet of the boiler, so it may be readily isolated for service.
A low water cut off is required if the boiler is installed above the level of radiation.
Even if the boiler is installed below the level of radiation it is strongly recommended
that a low water cut off be installed. Install manual and/or automatic air venting
devices at the high points in the system to eliminate trapped air. The weight of all
piping should be supported by suitable hangers and floor stands, not by the boiler’s
purging/expansion station. Clearance for hot water pipes are 1 inch to combustibles.
The make-up water line must be piped into the boiler and be fitted with a backflow
preventer and a pressure reducing valve to reduce line pressure to 10 to 15 psi.
In the case of a gas installation, the boiler should be installed such that the gas
ignition system components are protected from water (dripping, spraying, etc.) during
appliance operation and service (circulator replacement, condensate trap, control
replacement, etc.).
If the boiler is to be used in conjunction with a chilled water system, it must be
piped with the appropriate valves to ensure the chilled medium does not enter the
boiler. If the boiler is connected to heating coils in an air handling system, where the
coils could be exposed to cold air circulation, provisions for freeze protection control
must be installed. The boiler must have flow control valves or other automatic means
to prevent gravity circulation of the boiler water during the cooling cycle.
NOTE: If the heating system is to be filled with antifreeze, use only formulations
expressly made for hydronic heating systems (such as propylene glycol). Do not use
automotive types of antifreeze (ethylene glycol). Use of antifreeze will alter system
output and characteristics. Consult a factory representative for details or assistance.
SAFETY RELIEF VALVE
1. The safety relief valve should be piped into one of the two upper 3/4” tapings in
the rear of the boiler
2. The relief valve should be installed using the hardware supplied in the trim kit
without valving between the PRV and the boiler.
3. Pipe the discharge for the safety relief valve with copper tube to within 4” from the
floor and make sure installation of the pipe conforms to local codes.

15
7. Intake Venting
1. Be certain adequate air is available for combustion and ventilation.
a.) Boiler located in unconfined space:
Installation in large areas, such as basements, can usually be assumed to
provide sufficient air.
b.) Boiler located in confined space : (See Figure A. on page 14)
If all air for combustion and ventilation is to come from within the building:
Two (2) openings shall be provided with one (1) opening commencing within 12
inches of the ceiling and one (1) opening commencing within 12 inches of the floor of
the enclosure. These openings shall not be located closer than 3 inches from either
the top or bottom of the enclosure and shall be open to areas connecting freely
with the outdoors. The area of each opening shall not be less than one square inch
per 1000 BTU/HR. of total input rating of all appliances within the enclosure; with a
minimum of 100 square inches for each opening.
If all the air for combustion and ventilation is to come from outside the building:
Two (2) openings shall be provided with one opening commencing within 12
inches of the top and an opening commencing within 12 inches of the bottom of
the enclosure. These openings shall not be located closer than 3 inches from either
the top or bottom of the enclosure, and shall connect directly or by ducts too the
outdoors. The area of each opening shall be equal to one square inch per 4000 BTU/
HR of total input rating. If ducts are used to convey the air, vertical ducts require
areas of one square inch per 4000 BTU/HR. Horizontal ducts require one square inch
per 2000 BTU/HR. Ducts shall have the same cross sectional area as the full area of
the louver openings.
The upper opening is essential for maintenance of proper air circulation with
the boiler and to maintain proper control temperatures. When a duct is used for
ventilation, check for louver free net area and correct for screen resistance to ensure
that the sufficient ventilation area has been satisfied. DO NOT INSTALL THE BOILER
UNTIL PROPER COMBUSTION AIR HAS BEEN ARRANGED.

16
7. Intake Venting (Continued...)
c.) Boiler located in a room under negative pressure:
If the boiler is to be installed within a home where the operation of exhaust fans,
attic fans, kitchen ventilation systems, clothes dryers or fireplaces may create
severe negative vent pressures causing unsatisfactory combustion and venting,
special provisions should be made for additional make-up air to supply the other
air requirements. If building is of tight construction, combustion air requirements
may not be met and combustion air ducts from outside may be necessary. Please
refer to NFPA No. 31.
Tight Construction (as defined by ANSI Z223.1):
1. Walls and ceilings exposed to the outside atmosphere have a continuous water
vapor retarder with a rating of 1 perm or less with openings sealed with gaskets,
etc..
2. Weather-stripping has been added on open able windows and doors, and
caulking or sealants are applied to areas such as: joints around windows and
door frames, between sole plates and floors, between wall ceiling joints, between
wall panels, at penetrations for plumbing, electrical, and gas lines, and in other
openings.
If the building is of tight construction, air openings must be provided from the
outside, with appropriate sizing depending on amount of BTU/HR as shown in
Figure A. The boiler room must never be under a negative pressure, even if the
appliance is installed as direct vent. Always provide air openings sized not only to
the dimensions required for the firing rate of all appliances, but also to handle the
air movement rate of the exhaust fans or air movers using air from the building or
boiler room.
4,000
Figure A.

17
8. Exhaust Venting
The SRU boiler is a high efficiency unit that requires proper venting. The boiler
must be vented to the outdoors by means of a lined masonry or a approved pre-
fabricated chimney of the size and height recommended by the manufacturer or by
a listed "power venting" unit which provides draft by mechanical means. In many
installations, particularly older interior and most exterior chimneys, a corrosion resistant
liner should be installed and may be required by code. Please consult the liner
manufacturer for the appropriate chimney liner.
The flue-gas exit of the chimney must be located at least 24 inches above any
part of the building structure within 4 feet of the chimney. Be sure the chimney and
smoke pipe won't become obstructed by rodents, bird nests, soot buildup, chimney
liner deterioration, etc.. If using a "power venter" system, it is suggested that it should
be installed on the leeward side of the house. (Please consult with the manufacturer
of "power venter" for requirements concerning clearances from combustibles and
distances from doors and windows.) The "venter" must be installed by a licensed
burner mechanic and done in accordance with local codes. This is a very low stack
temperature boiler so caution should be used when connecting to an outside built
chimney. Proper chimney sizing is important to prevent damage due to possible
condensation from low flue gas temperatures. Should you have concern that the flue
gases could condense, you should consider lining the chimney or using a listed, "power
venting" or the QHT direct vent system. If "power venting" is used to discharge flue
gases, then the power vent unit should be equipped with a postpurge control such as a
delay-off, timing control to prevent problems with fogging and nozzle post drip. If the
boiler is installed as a direct vent unit, it must be installed using a direct vent kit supplied
by QHT Inc.
The exhaust pipe connection from the boiler to the chimney should be as short as
possible, with a minimum number of elbows. The vent pipe must have a vertical rise of
at least 1/4 inch per foot of horizontal run. The vent pipe must be of the same diameter
as the flue outlet on the boiler. The chimney connector should have a minimum
thickness of 26 gauge, corrosion resistant (galvanized) steel, and be assembled with
a minimum of three (3) sheet-metal screws in each joint. In most one and two story
houses, a barometric draft control is not required as the SRU is designed to be pressure
fired. However in high draft situations which exceed the flue gas resistance through the
boiler, a barometric draft control is recommended. The over fire draft should be positive
and between 0 and .06 inches of water column. The draft at the breech should be
enough to overcome the resistance through the boiler.

18
8.1 Common Exhaust Venting
Common vent exhaust:
If this boiler is replacing one which was part of a common venting system, it
is likely that the vent is to large to vent the appliances still attached to it. To prevent
this, at the time of removal, the following steps shall be followed with each appliance
remaining connected to the common venting system. Place each appliance 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. Insofar as practical, close all building doors and windows and all doors between the
space in which the appliance remaining connected to the common venting system
is located and other spaces of the building . Turn on any appliance not connected
to the common vent system. Turn on all exhaust fans except for summer exhaust
fans. Close the fireplace damper if applicable.
4. Place in operation the appliance being inspected. Follow the lighting instructions.
Adjust thermostat so appliance will operate continuously.
5. Test for spillage at the barometric damper opening after 5 minutes of main burner
operation. Use the flame of a match or candle, or 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
the doors, windows, exhaust fans, fireplace dampers 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 Gas Code, ANSI Z223.1 and/or CAN/CGA
B149, Installation Codes. When resizing any portion of the common venting system,
the common venting system should be resized to approach the minimum size as
determined using the appropriate tables in Part 11 of the National Fuel Gas Code,
ANSI Z223.1, and/or CAN/CGA B149, Installation Codes.
For boilers connected to gas vents or chimneys, vent installations shall be in
accordance with part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI
Z223.1 or Section 7, Venting Systems and Air Supply for Appliances, of the CAN/CGA B149,
Installation Codes, or applicable provisions of the local building codes.
Vent connectors serving appliances vented by natural draft shall not be
connected into any portion of mechanical draft systems operating under positive
pressure.
8.2 Gas Venting

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9. Burner Setup
Good, reliable operation with a minimum of service, starts with attention to the small
details:
Note: Use a combustion analyzer to set up a Oil/Gas appliance.
Oil:
1. Setting the nozzle position and electrodes to the manufactures specs using the
manufacturer's gauges.
2. Installing a quality micron filter at the burner.(replace old oil lines and clear sludge)
3. Making careful/tight flare connections, without couplings, on oil suction line.
4. Checking fuel pump pressure is set to specs on following page.
5. Checking draft at the breeching to insure it is adequate to overcome flue gas
resistance. (-.02 to –.04 in. w.c.)
6. Setting the air band properly with well maintained instruments. A good target is 12%
to 12.5% of (CO2).
7. To achieve the rated efficiency level the CO2 should be set to 13.2% and CO should be
less than 50ppm
To ensure proper burner setup, gauges should be used to check things such as the
pump pressure, CO2 levels, CO levels, etc…
Gas:
1. Checking the electrode, orifice size, and flame rod settings against manufacturer’s
specs to insure proper operation.
2. Installing properly sized gas piping according to BTU input required and length of gas
line run.
3. Making sure there is proper manifold pressure before and after the gas valve using
a calibrated manometer.
4. Checking draft at the breeching to insure it is adequate to overcome flue gas
resistance. (-.02 to –.04 in. w.c.)
5. Setting the air band properly with well maintained instruments. A good target is 9.5%
to 10.0% of (CO2) for natural gas, or 11.0% to 11.5% of (CO2) for LP gas.
NOTE: Elevated CO during combustion analysis for the first few hours of operation from
off gassing due to insulation in the combustion chamber.

20
BURNER MANUFACTURER: BECKETT
Boiler Model: SRU30 SRU40 SRU50 SRU60
Burner Model: AFG AFG CF 375 CF 375
Firing Rate: 1.00 1.25 1.50 1.75
Insertion Depth: 4” 4” 6” 6”
Nozzle: .85X60 1.00X60 1.10X60 1.50X60
Spray Pattern: B B B B
Pump Pressure: 140 140 180 140
Head Type: L2 V1 V1 V1
Head /Air STATIC PLATE
(2-3/4”) 0 1 3
Air Band: 9/1 7/0 7/0 10/2
BURNER MANUFACTURER: RIELLO
Boiler Model: SRU30 SRU40 SRU50 SRU60
Burner Model: 40 F5 40 F5 40 F5 40 F10
Firing Rate: 1.00 1.25 1.50 1.75
Insertion Depth: 5” 5” 5” 5.875”
Nozzle: .85X60 1.00X60 1.25X60 1.50X45
Spray Pattern: W W W B
Pump Pressure: 145 psi 160 psi 150 psi 145 psi
Head Setting/Bar: 1.5 3 4 2
Air Gate: 3 3.25 4 2.75
BURNER MANUFACTURER: CARLIN
Boiler Model: SRU30 SRU40 SRU50 SRU60
Burner Model: EZ-97550F EZ-97550F EZ-97550H EZ-97550H
Firing Rate: 1.00 1.25 1.50 1.75
Insertion Depth: 4.5” 4.5” 4.5” 4.5”
Nozzle: .85X70 1.00X70 1.25X60 1.50X45
Spray Pattern: B B B B
Pump Pressure: 150 psi 150 psi 150 psi 150 psi
Head/Bar: 2 3 4 2
Air Gate: 40% 45% 50% 40%
9.1 Oil Burner Setup
This page is only for boilers using an oil burner. If a gas burner is being used,
please refer to page 19 for the proper setup of the burner and gas lines.
NOTE: EZ-Select replaces the former EZ-1 HP
BURNER MANUFACTURER: RIELLO
Boiler Model: SRU30H SRU40H SRU50H
Burner Model: 40 F5 40 F5 40 F5
Firing Rate: 1.00 1.25 1.50
Insertion Depth: 5” 5” 5”
Nozzle: .85X60 1.00X60 1.25X60
Spray Pattern: W W W
Pump Pressure: 145 psi 160 psi 150 psi
Head Setting/Bar: 1.5 3 4
Air Gate: 3 3.25 4
BURNER MANUFACTURER: CARLIN
Boiler Model: SRU30H SRU40H SRU50H
Burner Model: EZ-97550F EZ-97550F EZ-97550H
Firing Rate: 1.00 1.25 1.50
Insertion Depth: 4.5” 4.5” 4.5”
Nozzle: .90X70 1.10X70 1.35X60
Spray Pattern: B B B
Pump Pressure: 160 psi 160 psi 175 psi
Head/Bar: 2 3 4
Air Gate: 45% 50% 60%
Energy Star Compliant Ratings High Output Ratings
NOTE: EZ-Select replaces the former EZ-1 HP