Lennox GWB9-100IH-2, GWB9-075IH-2, GWB9-050IH-2 User Manual
PRODUCT LITERATURE
Lennox Industries Inc.
Dallas, Texas
INSTALLATION
INSTRUCTIONS
GWB9-050IH-2
GWB9-075IH-2
GWB9-100IH-2
GAS-FIRED, DIRECT VENT,
CONDENSING, HOT WATER BOILER
RETAIN THESE INSTRUCTIONS FOR
FUTURE REFERENCE
These instructions must be affi xed on or
adjacent to the boiler .
!
Improper installation, adjustment,
alteration, service, or maintenance
could result in death or serious injury.
Refer to this manual for assistance. For
additional information consult a qualifi ed
installer, service agency, or the gas
supplier.
GAS-FIRED HOT WATER BOILERS
These low pressure gas fi red hot water boilers
are design certifi ed by CSA (Canadian Standards
Association) for use with natural and propane
gases (100 MBH model is certifi ed for natural gas
only). They are constructed and hydrostatically
tested for a 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.
WARNING
This boiler cannot be used with all types
of chimneys. Read these instructions
carefully before installing.
P/N# 240009449, Rev. A [07/2012]
Figure 1 - Boiler Dimensions
DIMENSIONS
2
INTRODUCTION
Dimensions ....................................................................................................................2
Introduction ...................................................................................................................3
Important Safety Information ........................................................................................... 4
Boiler Ratings & Capacities ..............................................................................................5
Boilers For Use At High Altitude ........................................................................................ 5
Before Installing The Boiler ..............................................................................................8
Boiler Installation ...........................................................................................................9
Near Boiler Piping ......................................................................................................... 11
Combustion Air And Vent Pipe ........................................................................................ 22
Gas Supply Piping ......................................................................................................... 28
Electrical Wiring ........................................................................................................... 30
Controls And Accessories ............................................................................................... 35
Start Up ...................................................................................................................... 37
Operating Instructions ................................................................................................... 38
S9381a Integrated Boiler Control Operation And Adjustments ............................................. 39
Maintenance And Cleaning ............................................................................................. 45
Troubleshooting ............................................................................................................ 47
Differential Air Pressure Switch Check ............................................................................. 49
Appendix A - Water Quality, Water Treatment And Freeze Protection .................................... 50
Installation And Check-Out Certifi cate ............................................................................. 54
Introduction
• This appliance is a gas-fi red direct vent hot water boiler
with cast aluminum boiler sections.
• The heating system water absorbs large amounts of
heat from the cast aluminum heat exchanger, cooling
fl ue gases and causing condensation.
• Sealed combustion, premix gas burner, and low fl ame
temperature means reduced CO and NOx emissions,
which contribute to cleaner and healthier environment.
• This appliance 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.
• Induced draft fan draws in outside combustion air,
takes cooler fl ue gases from boiler unit and provides
positive removal of fl ue gases from the building
through readily available PVC and CPVC pipes.
• These low pressure gas-fi red hot water boilers are
design certifi ed by CSA International for use with
natural gas and propane gases (90-100 model is
certifi ed for natural gas only).
• Boilers are constructed and hydrostatically tested
for maximum working pressure of 50 psig (pounds
per square inch gage) in accordance with A.S.M.E.
(American Society of Mechanical Engineers) Boiler and
Pressure Vessel Code Section IV Standards for heating
boilers.
3
!
This is the safety alert symbol. Symbol alerts you to
potential personal injury hazards. Obey all safety messages
following this symbol to avoid possible injury or death.
Become familiar with symbols identifying
potential hazards.
IMPORTANT SAFETY INFORMATION
General
Boiler installation shall be completed by qualifi ed agency.
See glossary for additional information.
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.
Keep this manual near boiler
Retain for future reference
Become familiar with symbols identifying
potential hazards.
This is the safety alert symbol. Symbol alerts you to
potential personal injury hazards. Obey all safety messages
following this symbol to avoid possible injury or death.
!
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in death or serious injury
!
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
!
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Installation shall conform to requirements of authority having jurisdiction or in absence of such requirements:
•
United States
• National Fuel Gas Code, ANSI Z223.1/NFPA 54
• National Electrical Code, NFPA 70.
• Canada
• Natural Gas and Propane Installation Code, CAN/CSA
B149.1.
• Canadian Electrical Code, Part I, Safety Standard for
Electrical Installations, CSA C22.1
Where required by authority having jurisdiction,
installation shall conform to Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
Additional manual reset low water cutoff and/or manual
reset high limit may be required.
Requirements for Commonwealth of
Massachusetts:
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not
limited to:
• Installation by licensed plumber or gas fi tter.
Installers - Follow local regulations with respect to
installation of CO (Carbon Monoxide) Detectors. Follow
maintenance recommendations “Maintenance And Cleaning”
on page 45 .
.
NOTICE
Used to address practices not related to personal
injury.
4
BOILER RATINGS & CAPACITIES
Table 1 - SEA LEVEL RATINGS – NATURAL AND PROPANE GASES
Model
90-50 50 45 39 220 2” CPVC & PVC
90-75 75 68 59 220 2” CPVC & PVC
90-100** 100 90 78 220 2” CPVC & PVC
* 1 MBH = 1,000 Btuh Btuh = British Thermal Units Per Hour
** 90-100 model is certifi ed for natural gas only.
++ AFUE (Annual Fuel Utilization Effi ciency) and Heating Capacity is based on the D.O.E. (Department of Energy) test
procedure.
Heating Capacity indicates the amount of heat available after subtracting losses up the stack. Most of this heat is available
to heat water. A small portion is heat from jacket and surfaces of the boiler, and it is assumed that this heat stays in the
structure.
Net AHRI rating represents portion of remaining heat that can be applied to heat radiation or terminal units (i.e. fi nned
tube baseboard, cast iron radiators, radiant fl oor, etc.). The difference between Heating Capacity and Net AHRI Rating,
called piping and pickup allowance, establishes reserve for heating volume of water in system and offsetting heat losses
from piping.
Net AHRI ratings shown are based on piping and pickup factor of 1.15 in accordance with AHRI Standard as published
by Hydronics Institute. Net AHRI rating of boiler selected should be greater than or equal to the calculated peak heating
load (heat loss) for building or area(s) served by boiler and associated hot water heating systems. Consult manufacturer
before selecting a boiler for installations having unusual piping and pickup requirements.
Boilers are factory equipped for operation at altitudes ranging from 0-5,000 feet above sea level (4,500 feet in Canada).
Boilers for use at high altitude
Canada - Contact Provincial authority having jurisdiction for installations above 4,500 feet (1,350m) above sea level.
United States - See “Boilers For Use At High Altitude” on page 6.
Input
*(MBH)
++ Heating Capacity
*(MBH)
Net AHRI Rating
*(MBH)
Shipping
Weight (lbs.)
Flue Diameter
5
BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS
• Boilers (with exception of 90-75 propane (LP) product)
are factory equipped for operation at altitudes ranging
from 0-10,000 feet above sea level.
• No changes to factory settings are required for installations from 0-5,000 feet above sea level.
• For altitudes from 5,000-10,000 feet above sea level
gas manifold pressure needs to be adjusted based upon
calorifi c (Btu) value of supply gas (contact local gas
utility or distributor for this value).
• For specifi c settings refer to Table 2 for natural gas
applications and
applications.
Table 3, Page 7
for propane (LP) gas
• Instructions on how to adjust gas manifold pressure
settings see
Note 90-75 propane (LP) applications for 5,000 - 10,000
feet above sea level require orifi ce change as well as gas
manifold pressure adjustment based upon calorifi c (Btu)
value of supply gas.
Refer to
number. For replacing orifi ce refer to specifi c instructions
included with conversion kit.
Table 2
Figure 27 and Figure 28, Page 44
and Table 3 for high altitude orifi ce part
Table 2 - 90 - 50/75/100 SERIES 2 NATURAL GAS
MODEL 90-50
Stock Factory Btu Value of Natural Gas++
Settings 750 850 950 1000 1050
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 50 – – – – –
Manifold Pressure In W.C. 2.5 4 4 3.5 2.5 2.5
Orifi ce 43331094 43331094
MODEL 90-75
Stock Factory Btu Value of Natural Gas++
Settings 750 850 950 1000 1050
Altitude in Ft. 0-5,000 5,000-10,000
.
Normal Input (MBH) 75 – – – – –
Manifold Pressure In W.C. 2.5 3.5 3.5 2.5 2.5 2.5
Orifi ce 43331092 43331092
MODEL 90-100
Stock Factory Btu Value of Natural Gas++
Settings 750 850 950 1000 1050
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 100 – – – – –
Manifold Pressure In W.C. 2.5 3.5 3.5 2.5 2.5 2.5
Orifi ce 43331090 43331090
++Contact local gas utility or distributor for Btu value of gas.
6
BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS
Model 90-75 propane (LP) units only at altitudes
above 5,000 ft., install 90-75 High Altitude Orifi ce Kit
#550002629*.
For all other altitudes use sea level orifi ce
Table 3 - 90 - 50/75 SERIES 2 PROPANE GAS
MODEL 90-50
Stock Factory Btu Value of Propane Gas++
Settings 2300 2350 2400 2450 2500
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 50
Manifold Pressure In W.C. 2.5 3 3 2.5 2.5 2.5
Orifi ce 43331095 43331095
MODEL 90-75*
Stock Factory Btu Value of Propane Gas++
Settings 2300 2350 2400 2450 2500
Altitude in Ft. 0-5,000 5,000-10,000
Normal Input (MBH) 75
Manifold Pressure In W.C. 2.5 3.5 3.5 3.5 3 3
Orifi ce 43331093
* For model 90-75 Propane units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifi ce Kit #550002629 For all other
altitudes use sea level orifi ce.
++Contact local gas utility or distributor for Btu value of gas.
–– – – –
–– – – –
43331096*
7
BEFORE INSTALLING THE BOILER
1.
Boiler is equipped for residential installations. If used
for commercial applications, any additional code
requirements must be adhered to for installation. This
may require additional controls including but not limited
to a low water cut off, a manual reset high temperature
limit, and wiring and/or piping modifi cations.
2.
Before servicing boiler - allow boiler to cool. Shut off
electricity and gas supply connected to boiler prior to
servicing.
3.
Inspect gas line for leaks.
4.
Verify gas input rate is correct. Over fi ring may result
in early failure of boiler sections. This may cause
dangerous operation. Under fi ring may result in too
much air for pre-mix burner causing poor or loss of
combustion.
5.
Never vent products of combustion from this boiler to
enclosed space. Always vent to outdoors. Never vent to
another room or to inside building.
6.
Be sure there is adequate outdoor air supply to boiler
for complete combustion.
7.
Follow regular service and maintenance schedule for
effi cient and safe operation.
8.
Keep boiler area clean of debris and free of combustible
and fl ammable materials.
9.
Proper through wall or through roof combustion venting
shall be in accordance with materials and methods
described in this manual. Installation must comply with
local codes.
10.
Boiler and related hot water heating systems are not do
it yourself items they must be installed and serviced by
qualifi ed professionals.
Boiler Sizing
Check to be sure you have selected boiler with proper
capacity before starting 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
Table 1, Page 5 .
Heat loss calculations should be based on approved
industry methods.
Boiler Location Considerations
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 amounts of fresh (outdoor)
air for combustion, refer to “Combustion Air and Vent
Pipe” on page 22 for details.
• Connected to a suitable venting system to remove
the hazardous products of gas combustion, refer to
“Combustion Air and Vent Pipe” on page 22 for details.
• 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. DO NOT install on carpeting.
• Condensate drain line must be pitched down to fl oor
drain or external condensate pump with reservoir at ¼”
per foot (wood frame or blocks may be used to raise
boiler).
8
BOILER INSTALLATION
Locating The Boiler
1.
Place crated boiler as close to selected location as
possible and un-crate boiler. Boiler may be moved into
position with appliance dolly or 2 wheel hand truck.
Insert dolly or hand truck under left hand side of
boiler. It is possible to slide boiler for short distance on
smooth fl oor or surface.
1.
Select level location central to piping systems served
and as close to vent and air intake terminals as
possible.
2.
Accessibility clearances, if more stringent (i.e. larger
clearances) than required fi re protection clearances,
must be used for boiler installation. Accessibility
clearances may be achieved with the use of removable
walls or partitions.
3.
Boiler is approved for installation in closets and on
combustible fl oors. This boiler shall NOT be installed on
carpeting.
4.
Clearances shown in Table 4 indicate required
clearances. Maintain minimum 1” clearance between
combustible construction and each of left, top and
back surfaces of the boiler. Minimum 11” clearance
is required on right side, to allow room for induced
draft blower. Maintain 18” clearance at side where
passage is required to access another side for cleaning
or servicing, inspection or replacement of parts. Allow
24” at front and left side and 8” at top for servicing. No
clearances are required to venting or combustion air
intake piping.
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 fl ow through piping systems
without restrictions for boiler operation.
7.
Install boiler such that the automatic gas ignition
system components are protected from water
(dripping, spraying, rain, etc.) during operation and
service (circulator replacement, condensate trap,
control replacement, etc.).
• When vent pipe is exposed to temperatures below
freezing, such as when it passes through an unheated
space or when chimney is used as a raceway, vent pipe
must be insulated with 1/2” Armafl ex or equivalent.
In extreme cold climate areas, use ¾” Armafl ex or
equivalent.
!
WARNING
Solvent cements are combustible. Keep away from
heat, sparks, and open fl ame. Use only in well ven-
tilated areas. Avoid breathing in vapor or allowing
contact with skin or eyes. Failure these instructions
could result in fi re, personal injury, or death.
• Combustion air must be clean outdoor air. Combustion
air must not be taken from inside structure because
that air frequently is contaminated by halogens, which
include fl uorides, chlorides, phosphates, bromides and
iodides. These elements are found in aerosols, detergents, bleaches, cleaning solvents, salts, air fresheners,
paints, adhesives and other household products.
• Locate combustion air inlet as far away as possible
from swimming pool and swimming pool pump house.
• All combustion air and vent pipes must be airtight and
watertight. Combustion air and vent piping must also
terminate as shown in
Pipe”
section.
• Vent connections serving appliances vented by
natural draft shall not be connected into any portion
of mechanical draft systems operating under positive
pressure.
Table 4 -
Unit
“Combustion Air and Vent
Required Clearances
Combustible
Clearance
Accessibility,
Cleaning, and
Servicing
Top 1” (26mm) 8” (204mm)
Combustion Air And Vent Pipe Requirements
This boiler requires a dedicated direct vent system. In a
direct vent system, all air for combustion is taken directly
from outside atmosphere, and all fl ue products are
discharged to outside atmosphere.
Terminate combustion air and vent pipe connections in
same atmospheric pressure zone, through roof or sidewall
(roof termination preferred). See Figure 12 thru Figure 14 ,
pages 24 and 25 for required clearances.
• Keep boiler area clean of debris and free of fl ammable
and combustible materials, vapors and liquids.
Left Side 1 “ (26mm) 24” (610mm)
Right Side 11” (280mm) -
Base 1” (26mm) Front 1” (26mm) 24” (610mm)
Back 1” (26mm) -
Intake/Vent Piping 0 (0) -
Near Boiler Hot
Water Piping
All distances measured from the cabinet of the boiler.
1” (26mm) -
9
BOILER INSTALLATION
Condensate Drain Requirements
• Pitch condensate drain line down to fl oor drain at mini-
mum of ¼” per foot. External condensate pump (not
furnished) may be used if fl oor drain is not available.
• Condensate pump must be designed for fl ue gas con-
densate application.
• Condensate trap provided with boiler, an additional trap
is not required and should not be used.
• Wood frame or blocks may be used to raise boiler
to maintain drain pitch or to be above external
condensate pump reservoir.
Foundation Requirements
• Install boiler on level surface.
!
WARNING
Fire hazard. Do not install boiler on carpeting.
Failure to follow these instructions could result in
death or serious injury.
• Boiler is NOT to be installed on carpeting.
• 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.
• 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 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
restrictions, leakage, corrosion and other defi 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 fi re dampers.
4.
Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat so
appliances will operate continuously.
5.
Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the fl ame of a
match or candle, or the smoke from a cigarette, cigar
or pipe.
6.
After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fi re place 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 Code, NFPA-54/ANSI -Z223.1 and/
or the Natural Gas and Propane Installation Code,
CAN/CSA B149.1.. When re-sizing any portion of the
common venting system, the common venting system
should be re-sized to approach the minimum size as
determined using the appropriate tables in Chapter 13
of the National Fuel Gas Code, NFPA-54/ANSI- Z223.1
and/or the Natural Gas and Propane Installation Code,
CAN/CSA B149.1.
10
NEAR BOILER PIPING
Clean the System First
Before
system thoroughly. Verify system is free of sediment, fl ux
and any residual boiler water additives.
Systems having antifreeze not recommended must be
completely fl ushed to insure 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 the system should be cleaned
or treated. Thoroughly fl ush system with clean water to
remove any sediment or contaminants. Sludge and iron
oxide deposits can cause rapid breakdown of inhibitors.
Flushing 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
connecting boiler to heating system, clean and fl ush
mix different manufacturer’s products.
• When boiler installation is for new heating system,
install all of radiation units (panels, radiators,
baseboard, or tubing) and supply and return mains.
Supply And Return Lines
• Boiler is set up to receive 1 ¼” NPT supply and return
piping from top access.
• Boiler may be piped from left side by turning supply
elbow.
• Install furnished dielectric unions at boiler supply and
return lines prior to making system piping connections
• Do Not install copper supply and return piping directly
into aluminum boiler section casings due to galvanic
corrosion between dissimilar metals.
• Must use provided dielectric unions between copper
system piping and boiler to make fi nal connection to
boiler.
• Furnished circulator pump can be installed at installer
preferred location.
• After all heating system piping and components
have been installed, make fi nal connection of system
piping to boiler. A hot water boiler installed above
radiation level, or as required by the Authority having
jurisdiction, must be equipped with low water cut off
device.
• Periodic inspection is necessary for fl ushing of fl oat
type devices, per low water cut off manufacturers
specifi c instructions.
11
Figure 2 - Single Zone Boiler Piping
NEAR BOILER PIPING
12
NEAR BOILER PIPING
Multi-Zone Systems
Multi-zone systems with two zones are typically piped as
shown in fi gures 3 or 4. Multi-zone systems with more than
two zones are likely to have small zones with very low heat
and fl ow requirements compared to full heating capacity of
the boiler. This can result in very low fl ow in the boiler if
only one small zone is calling for heat.
Primary Secondary Piping is recommended for multi-zone
systems with more than two zones to insure proper water
fl ow through the boiler at all times. See fi gures 5, 6 and 7
for typical primary secondary piping confi gurations.
Figure 3 - Two Zone Boiler Piping With Zone Valves
13
NEAR BOILER PIPING
Figure 4 - Two Zone Boiler Piping With Circulators
14
NEAR BOILER PIPING
Figure 5 - Primary/Secondary Piping And Wiring With Circulators And Domestic Hot
Water
15
NEAR BOILER PIPING
Figure 6 - Piping and Wiring Primary/Secondary Multi Zone System Piping With Zone
Valves And Domestic Hot Water (With Zone Valve)
16
NEAR BOILER PIPING
Figure 7 - Piping And Wiring Primary/Secondary Piping With Zone Valves And Domestic
Hot Water (With Circulator)
17
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