INSTALLATION
INSTRUCTIONS
GWB8-042IE-2, GWB8-075IE-2
GWB8-112IE-2, GWB8-150IE-2
GWB8-187IE-2, GWB8-225IE-2
GAS FIRED BOILER
PRODUCT LITERATURE
Lennox Industries Inc.
Dallas, Texas
RETAIN THESE INSTRUCTIONS FOR
FUTURE REFERENCE
These instructions must be affixed on
or adjacent to the boiler.
!
WARNING
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 qualified installer, service agency, or the gas
supplier.
This boiler cannot be used with all types of
chimneys. Read these instructions carefully
before installing.
GAS-FIRED HOT WATER BOILERS
These Gas-Fired Water boilers are low pressure,
sectional cast iron boilers Design Certified by
CSA (Canadian Standards Association) for
use with Natural and Propane Gases. They
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 Cast Iron Heating Boilers.
C.S.A. Certified
For Natural Gas Or Propane
Tested For 50 psi.
ASME
Working Pressure
P/N# 240009135, Rev. C [06/2012]
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BOILER RATINGS & CAPACITIES
Table 1 RATINGS NATURAL AND PROPANE GASES
**Net
AHRI
Rating
Water
*Mbh
Vent Diameter (Inches)
Heating
Capacity
*Mbh
Input
*Mbh
Model
AFUE
To Chimney
Horizontal Vent
(Category III)
(Category I)
GWB8-042IE-2
GWB8-075IE-2
GWB8-112IE-2
GWB8-150IE-2
GWB8-187IE-2
GWB8-225IE-2
42.5
75.0
36
63
31
55
84.4
83.4
83.0
82.7
82.3
82.0
4
4
4
4
4
4
3
3
3
3
4
4
112.5
150.0
187.5
225.0
94
82
125
155
186
109
135
162
* MBH = 1,000 Btuh = British Thermal Unit Per Hour. Boilers are equipped for altitudes up to 2,000 feet only.
• U.S.A. Only - For altitudes above 2,000 feet, ratings should be reduced at the rate of 4% for each
1,000 feet above sea level.
• Canada Only - Boilers may be used at high altitude (2,000-4500 feet/640-1350m) by using a certified
field conversion kit, resulting in a 10% de-rate. Contact Provincial authority having jurisdiction for
installations above 4500 ft (1350m)above sea level.+ Heating Capacity based on D.O.E. (Department
of Energy) test procedure.
** Net AHRI Water Ratings indicate amount of remaining heat input that can be used to heat the radiation
or terminal units. Net AHRI Ratings shown are based on an allowance of 1.15 Selection of
boiler size should be based upon “Net AHRI Rating” being equal to or greater than calculated
heat loss of building.
Manufacturer should be consulted before selecting a boiler for installations having unusual piping
and pickup requirements.
New York City MEA Number 484-84-E Vol. IV
.
This boiler cannot be used with all types of chimneys. Read these instructions carefully before installing.
These Gas-Fired Hot Water Boilers are low pressure, sectional cast iron boilers Design Certified by C.S.A. (Canadian Standards
Association) for use with Natural and Propane Gases. Constructed and hydrostatically tested for maximum working pressure of 50 psi in
accordance with A.S.M.E. Boiler and Pressure Vessel Code Section IV Standards for cast iron heating boilers.
Boilers must stand on noncombustible floor. If installed on combustible floor, please refer to Repair Parts manual for appropriate
Combustible Floor Base part number.
Boilers For Use At High Altitude
Boiler is factory equipped for use at altitudes of 0-2,000 feet above sea level. For use at altitudes above 2,000 feet above sea level,
input ratings are reduced by change in main burner orifice size.
U.S.A. Only - For altitudes above 2,000 feet above sea level, input ratings should be reduced at rate of 4% for each 1,000 feet above
sea level. Consult National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or Natural Gas and Propane Installation Code, CAN/CSA B149.1,
or manufacturer for correct orifice sizing information.
Canada Only - For altitudes in the range of 2,000-4,500 feet (610 - 1350m) above sea level, boilers may be field equipped for use
at high altitude by using a certified field conversion kit. The change in main burner orifice size results in the boiler’s input rating
being reduced by 10%.The conversion shall be carried out by a manufacturer’s authorized representative, in accordance with the
requirements of the manufacturer, provincial or territorial authorities having jurisdiction and in accordance with the requirements of
CSA-B149 Natural Gas and Propane Installation Code. The certified field conversion kit includes a conversion data plate, which must be
attached to the boiler adjacent to the rating plate, indicating that the boiler has been converted for high altitude use. The conversion
data plate must be filled in with the correct conversion information.
For altitudes over 4500 feet (1350m), contact Provincial authority having jurisdiction.
3
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DIMENSIONS
Model
Width (A)
GWB8-042IE-2
GWB8-075IE-2
GWB8-112IE-2
GWB8-150IE-2
GWB8-187IE-2
GWB8-225IE-2
11
14-1/4
17-1/2
20-3/4
24
27-1/4
4
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INSTALLATION PROCEDURE
!
NOTICE
Follow local regulations with respect to installation
of CO detectors.
WARNING
Improper installation, adjustment, alteration, service
or maintenance could result in death or serious
injury.
10. FOR INSTALLATION ON NON-COMBUSTIBLE
FLOORS ONLY - For installation on combustible
flooring special base must be used. (See Replacement
Parts Section.) Do Not Install Boiler on carpeting.
1. The installation must conform to the requirements of
the authority having jurisdiction or, in the absence
of such requirements, to the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, and/or Natural Gas and Propane
Installation Code, CAN/CSA B149.1
11. Verify boiler is supplied with correct type of gas, fresh
air for combustion, and suitable electrical supply.
2. Where required by authority having jurisdiction,
installation must conform to the Standard for Controls
and Safety Devices for Automatically fired Boilers,
ANSI/ASME CSD-1.
Figure 1 - Minimum Clearances To Combustible
Construction
3. This boiler series is classified as a Category I. Vent
installation shall be in accordance with “Venting of
Equipment ,” of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or “Venting Systems and Air Supply
for Appliances,” of the Natural Gas and Propane
Installation Code, CAN/CSA B149.1, or applicable
provisions of the local building codes.
6”
Rear
6”
8”
Boiler
Front
4. Boiler has met safe lighting and other performance
criteria with gas manifold and control assembly on
boiler per latest revision of ANSI Z21.13/CGA 4.9.
5. Install such that gas ignition system components are
protected from water (dripping, spraying, rain, etc.)
during appliance operation and service, (circulator
replacement, condensate trap, control replacement,
etc.).
18”
6. Locate boiler on level, solid base as near chimney as
possible and centrally located with respect to heat
distribution system as practical.
7. Verify you have the right size boiler before starting
installation. See rating and capacity table.
Table 2 - BOILER MINIMUM CLEARANCE TO
COMBUSTIBLES
8. When installed in utility room, door should be wide
enough to allow largest boiler part to enter, or to
permit replacement of another appliance such as water
heater.
Minimum
Unit
Clearances
9. Boiler installed in building under construction, take
care to insure clean combustion air supply during
construction process. Airborne particulates such as
from drywall dust and from fiberglass insulation can
clog burner ports and cause incomplete combustion and
sooting.
Top
6” (152mm)
6” (152mm)
Rear
Control Side
Opposite Side
Front (Alcove)
8” (203mm)
6” (152mm)
18” (457mm)
!
WARNING
Flue/Vent Connector
Near Boiler Piping
6” (152mm)
1/2” (13mm)
Fire hazard. Do not install boiler on combustible
flooring or carpeting. Failure to follow these
instructions could result in death or serious injury.
Set unit on concrete or other noncombustible material base or
floor. DO NOT INSTALL ON CARPETING.
5
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VENTILATION & COMBUSTION AIR
• All Outdoor Air. Provide permanent opening(s)
communicating directly or by ducts with outdoors.
Provide combustion air and ventilation air in accordance
with the section “Air for Combustion and Ventilation,” of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, or Sections
8.2, 8.3 or 8.4 of Natural Gas and Propane Installation
Code, CAN/CSA B149.1, or applicable provisions of local
building codes.
о Two Permanent Opening Method. Provide opening
commencing within 12 inches of top and second
opening commencing within 12 inches of bottom
enclosure.
Direct communication with outdoors or
communicating through vertical ducts. Provide
minimum free area of 1 in2 per 4 Mbh of total
input rating of all appliances in enclosure.
Provide make-up air where exhaust fans, clothes dryers,
and kitchen ventilation equipment interfere with proper
operation.
Communicating through horizontal ducts.
Provide minimum free area of 1 in2 per 2
Mbh of total input rating of all appliances in
enclosure.
National Fuel Gas Code recognizes several methods
of obtaining adequate ventilation and combustion air.
Requirements of the authority having jurisdiction may
override these methods.
• Engineered Installations. Must be approved by
authority having jurisdictions.
о One Permanent Opening Method. Provide opening
commencing within 12 inches of top of enclosure.
Provide minimum clearance of 1 inch on sides
and back and 6 inches on front of boiler (does not
supersede clearance to combustible materials).
• Mechanical Air Supply. Provide minimum of 0.35
cfm per Mbh for all appliances located within space.
Additional requirements where exhaust fans installed.
Interlock each appliance to mechanical air supply
system to prevent main burner operation when
mechanical air supply system not operating.
о Combination Indoor and Outdoor Air. Refer to
National Fuel Gas Code for additional requirements
for louvers, grilles, screens and air ducts.
• All Indoor Air. Calculate minimum volume for all
appliances in space. Use a different method if
minimum volume not available.
• Combination Indoor and Outdoor Air. Refer to
National Fuel Gas Code for application information.
National Gas and Propane Installation Code Requires
providing air supply in accordance with:
о Standard Method. Cannot be used if known air
infiltration rate is less than 0.40 air changes per
hour. See Table 3 for space with boiler only. Use
equation for multiple appliances.
• Section 8.2 and 8.3 when combination of appliances
has a total input of up to and including 400 Mbh (120
kW).
Volume ≥ 50 ft3 x Total Input [Mbh]
о Does not have draft control device.
о Known Air Infiltration Rate. See Table 3 for
space with boiler only. Use equation for multiple
appliances. Do not use an air infiltration rate
(ACH) greater than 0.60.
• Section 8.4 when combination of appliances has total
input exceeding 400 Mbh (120 kW).
• Refer to Natural Gas and Propane Installation Code
for specific air supply requirements for enclosure
or structure where boiler is installed, including air
supply openings and ducts.
Volume ≥ 15 ft3/ACH x Total Input [Mbh]
о Refer to National Fuel Gas Code for opening
requirements between connection indoor spaces.
Table 3- Air Infiltration Rate
Known Air Infiltration Rate Method (Air Changes Per Hour)
Standard
Method
Input Mbh
0.1
0.2
0.3
2125
3750
5625
7500
9375
11250
0.4
0.5
0.6
42.5
75
2125
3750
5625
7500
9375
11250
6375
3188
1594
2813
4219
5625
7031
8438
1275
2250
3375
4500
5625
6750
1063
1875
2813
3750
4688
5625
11250
16875
22500
28125
33750
5625
112.5
150
8438
11250
14063
16875
187.5
225
6
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INSTALLATION SYSTEM PIPING
!
WARNING
Burn or Scald Hazard. Discharge line shall be installed to relief valve outlet connection to avoid burns,
scalding, or water damage due to discharge of steam and/or hot water during operation.
Discharge line shall:
• connect to relief valve outlet and piped down to safe point of disposal. Check local codes for maximum
distance from floor or allowable safe point of discharge.
• be of pipe size equal to or greater than that of the relief valve outlet over the entire length of discharge
line;
• have no intervening shutoff valve between safety relief valve and discharge to atmosphere (do not plug or
place any obstruction in discharge line.
• terminate freely to atmosphere where any discharge will be clearly visible and at no risk of freezing;
• allow complete drainage of the valve and the discharge line;
• be independently supported and securely anchored to avoid applied stress on the relief valve;
• be as short and straight as possible;
• terminate with plain end (not threaded);
• be constructed of material suitable for exposure to temperatures of 375° F; or greater.
Refer to local codes and appropriate ANSI/ASME Boiler and Pressure Vessel Code, Section IV, or Boiler,
Pressure Vessel and Pressure Piping Code, CSA B51 for additional installation requirements.
1. Refer to local codes and appropriate ASME Boiler
and Pressure Vessel Code for additional installation
requirements.
Figure 2 - Safety Relief Valve Discharge Piping
2. Install relief valve on 3/4” pipe nipple in tapped boiler
opening.
RELIEF VALVE
A. Pipe discharge line following guidelines in preceding
Warning. See Figure 2.
DISCHARGE
PIPING
B. Discharge line pipe size shall be equal or greater
than that of relief valve outlet over entire length
of discharge line with no intervening shutoff valve
between safety relief valve and discharge to
atmosphere.
C. Discharge line shall terminate with plain end to
atmosphere where any discharge will be clearly
visible and is at no risk of freezing.
Check local codes
for maximum
distance from
floor or other
allowable safe
point of discharge
D. Discharge line shall be independently supported to
avoid applied stress on relief valve.
E. Installation shall allow complete drainage of relief
valve and discharge line.
3. Install Drain Valve on lower left side of boiler as
marked.
4. Install Temperature and Pressure Gauge into ¼”
bushing threaded in tee furnished with supply piping.
See Figures 3 and 4
.
5. Connect Supply and Return Lines to boiler. Figure 3 &
4. Connections may require certain additional fittings
and parts.
7
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INSTALLATION SYSTEM PIPING
Figure 3 - Forced Hot Water Typical Piping
Figure 4 - Forced Hot Water Typical Piping
With Zone Control Valve
8
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INSTALLATION SYSTEM PIPING
• Install radiation units (panels, radiators or cabinets) and
supply and return mains first then make connections at
boiler.
Low Design Water Temperature Systems (Below
140°F) And Large Water Content Systems
• Verify clean water supply is available when connecting
cold water supply to water valve. Install sand strainer at
pump when water supply is from well or pump.
• Provide low water cutoff device when boiler is installed
above radiation level or as required by the Authority
having jurisdiction, either provide as part of boiler
or at time of boiler installation. Periodic inspection
is necessary, as is flushing of float type devices, per
manufacturers specific instructions.
Condensation is corrosive and can eventually cause severe
damage to boiler and venting system.
• Minimum design return water temperature to prevent
condensation in boiler and venting is 120°F. Minimum
high limit setting is 140°F.
• Boiler used in heating systems where design water
temperatures below 140°F are desired (e.g. radiant floor
heating), a 3-way or 4-way mixing valve or suitable
alternative is required to prevent low temperature return
water from entering boiler. When using mixing valve,
follow manufacturer’s installation instructions.
• Boiler used in connection with refrigeration systems shall
be installed so chilled medium is piped in parallel with
heating boiler with appropriate valves to prevent chilled
• Boiler connected to system having large water content
(such as former gravity system), suggest use of bypass
medium from entering heating boiler. See Figure 5
.
• Boiler connected to heating coils located in air handling
units exposed to refrigerated air circulation, piping
system shall be equipped with flow control valves or
other automatic means to prevent gravity circulation of
boiler water during cooling cycle.
piping. See Figure 6
.
Figure 5 - Piping Arrangements For Boiler When
Used In Connection With Refrigeration
System
Figure 6 - Bypass Piping
9
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VENT INSTALLATION
11. Fasten sections of vent pipe with sheet metal screws to
Check Your Chimney
make piping rigid. Use stovepipe wires to support pipe
from above.
Chimney must be clean, right size, properly constructed
and in GOOD CONDITION.
12. Do not connect to fireplace flue.
1. Installation must conform to requirements of the
authority having jurisdiction or, in absence of such
requirements, to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or of the Natural Gas and Propane
Installation Code, CAN/CSA B149.1, or applicable
provisions of the local building codes..
13. Do not install damper on this boiler.
Minimum Vent Pipe Clearance
• Use Type B vent pipe through crawl space. Where vent
pipe passes through combustible wall or partition, use
ventilated metal thimble. Thimble should be 4 inches
larger in diameter than vent pipe.
• Boiler installed with single wall vent, must have 6”
clearance between its surface and any combustible
material. New Type B gas vent or flexible liner must be
installed in accordance with instructions furnished with
vent. Maintain clearances as specified for vent pipe.
• Verify vent pipe is fire-stopped where it goes through
floor or ceiling. It should have approved vent cap with
clearances from roof. If clearances are less than shown
in have vent checked by local authorities. See Figure 7,
Page 11.
• Vent connectors serving appliances vented by natural
draft shall not be connected into any portion of
mechanical draft systems operating under positive
pressure.
2. Boiler’s induced draft blower has 3” outlet. 3” X
4” increaser fitting is included in parts bag. Locate
increaser fitting on outlet of induced draft blower, and
secure gas-tight with bead of furnished silicone sealant.
Increaser fitting is required on this boiler for Category I
venting, and 4” is minimum permissible vent diameter.
This does not imply vent connector is intended to be 4”
diameter pipe. Vent connector shall be sized according
to appropriate venting tables in the National Fuel
Gas Code and may be required to be larger than 4”
diameter.
NOTICE
Boiler installation for chimney venting is not complete
unless increaser fitting is located and secured.
3. These are high efficiency boilers with low stack or
exhaust temperature.
4. Venting into masonry chimney without liner, line
chimney from top to bottom with either:
A. Listed Type B vent pipe
B. Listed flexible vent liner
C. Poured ceramic liner.
5. Outside chimneys should not be used unless they are
(choose one of the following):
A. Enclosed in a chase
B. Lined with Type B vent pipe
C. Use listed flexible vent liner
D. Use certified chimney lining system
6. Vent connector from boiler to chimney should run as
directly as possible with as few elbows as possible.
7. Where possible, it is recommended to common vent
water heater and boiler. Consult appropriate Vent
Sizing Tables in National Fuel Gas Code for specific
requirements of multiple appliance venting.
8. Boiler is only appliance connected to vent, Type B vent
pipe is recommended for vent connector.
9. Slope pipe up from boiler to chimney not less than 1/4”
per foot (21mm/m).
10. End of vent pipe must be flush with inside face of
chimney flue. Use sealed-in thimble for chimney
connection.
10
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VENT INSTALLATION
Figure 7 - Type B Gas Vent
CHECK YOUR CHIMNEY
For boilers for connection to gas vents or
chimneys, vent installations shall be in
accordance with “Venting of Equipment”, of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54,
or of the Natural Gas and Propane Installation
Code, CAN/CSA B149.1, or applicable provisions
of the local building codes.
11
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VENT INSTALLATION
Removing Existing Boiler From Common Venting
System
5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use flame of a match
or candle, or smoke from a cigarette, cigar, or pipe.
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.
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, fireplace dampers and any
other gas-burning appliance to their previous conditions
of use.
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 appliance remaining connected
to the common venting system are not in operation.
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/NFPA 54,
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
determined using the appropriate tables in Chapter 13
of the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
and/or the Natural Gas and Propane Installation Code,
CAN/CSA B149.1.
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 and other deficiencies
which could cause an unsafe condition.
3. Insofar 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 dryers and any appliance not connected
to the common venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they will operate at maximum speed. Do not operate a
summer exhaust fan. Close fireplace dampers.
8. It is recommended that existing gas vents be checked
to be sure they meet local codes.
4. Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
will operate continuously.
12
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OPTIONAL HORIZONTAL VENTING INSTRUCTION
Horizontal venting with a power venter is an alternate
Confirm that installing a power venter is an option allowed
by local codes. Follow the specific power venter installation
instructions issued with the power venter kits. Although
the power venter is equipped with its own fan, the fan on
the boiler remains in place and is unaltered when a power
venter is used.
method of sidewall venting. This boiler is CSA listed for
sidewall venting with standard single wall galvanized or
Type B vent pipe when using the following power venter
kits, which were specifically sized for these boilers:
Table 4- Field Controls
When sidewall venting, flue gases must be vented to a
point in relation to the prevailing wind so that they may
freely disperse without being blown back at the building
causing discoloration, or into the building through doors or
windows causing odors. Also, under certain conditions flue
gases will condense, forming moisture. In such cases, steps
should be taken to prevent building materials at the vent
terminal from being damaged by the exhausted flue gas.
Number Of
Boiler Sections
2, 3, 4, 5
Field Controls
Power Venter
SWG-4D
6, 7
SWG-5D
Some possible reasons for using a power venter for
sidewall venting:
When installing single wall galvanized vent pipe for power
venting follow the specific power venter installation
instructions for layout, location of the barometric draft
control and termination connections.
1. May be preferred by local codes.
2. Need a vent piping run beyond 30’ (9.1m) (but not
more than 50’ (15.2m)).
3. The boiler installation site experiences gusting or high
winds. A power venter can help prevent the boiler from
short cycling due to gusting or high winds by providing
vent exhaust pressures greater than the boiler’s
induced draft blower alone.
When joining and sealing the single wall galvanized or Type
B vent piping, use RTV silicone sealant with a minimum
temperature rating of 400°F. For 3” vent pipe runs, be-
gin with the female end of the vent pipe over the boiler’s
induced draft blower outlet. For 4” vent pipe runs begin
with the galvanized 3” to 4” increaser fitting (included in
the boiler’s parts bag) over the induced draft blower outlet.
Then follow by placing the female end of the 4” vent pipe
over the increaser fitting.
4. When installers or homeowners prefer a negative
pressure vent system instead of a positive pressure
vent system.
5. May be more cost effective than stainless steel
venting, particularly at longer vent length.
The Field Controls power vent kit includes either a
SWG-II-4HD or SWG-II-5 power venter, a MG-1 4”
When joining pieces of single wall galvanized vent pipe, a
substantial bead of silicone should be used at the joint to
insure a leak proof connection.
barometric draft controller, and the CK-43D controls kit.
13
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GAS SUPPLY PIPING
Connecting Gas Piping
!
CAUTION
Gas line enters boiler from right side. Flexible gas
connectors must never breach any boiler openings.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements:
• Do not touch any electrical switch; do not use
any phone in your building.
• USA - National Fuel gas Code, ANSI Z223.1/NFPA 54
• Immediately call your gas supplier from a
neighbor’s phone. Follow gas supplier’s
instructions.
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
• All pipe compound must be resistant to liquefied
petroleum gas.
• If you cannot reach your gas supplier, call the fire
department.
• Install ground joint union in gas supply line between
shut-off valve and boiler controls.
• Install sediment trap upstream of gas controls.
Figure 8 - Gas Piping At Boiler
• Use two pipe wrenches when making connection to gas
valve to keep it from turning.
• Install manual shut-off valve in vertical pipe about 5 feet
(1.5m) above floor. See Figure 8.
• Tighten all joints securely.
• Propane gas connections should only be made by
licensed propane installer.
• Two-stage regulation should be used by propane
installer.
• Propane gas piping should be check by propane installer.
Check Gas Supply
Gas pipe must be correct size for length of run and for
total BTU per hour input of all gas utilization equipment
connected to it. See Table 6 & 7, Page 15 for proper size.
Be sure your gas line complies with local codes and gas
company requirements.
!
DANGER
Fire Hazard. Do not use matches, candles, open
flames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
Table 5 - Gas Pressures
GAS
PRESSURE
NATURAL
5" w.c.
PROPANE
11" w.c.
MIN. SUPPLY
MAX. SUPPLY
MANIFOLD
Check Gas Piping
13.5" w.c.
3.5" w.c.
13.5" w.c.
10" w.c.
Pressure test boiler and gas connection before placing
boiler in operation.
• Pressure test over 1/2 psig (3.5 kPa). Disconnect
boiler and its individual gas shutoff valve from gas
supply system.
Verify minimum pressure while boiler is operating.
Verify maximum pressure when boiler is not operating
• Pressure test at 1/2 psig (3.5 kPa) or less. Isolate
boiler from gas supply system by closing manual gas
shutoff valve. See Figure 8.
• Locate leakage using gas detector, noncorrosive
detection fluid, or other leak detection method
acceptable to authority having jurisdiction.
• Correct leaks immediately and retest.
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GAS SUPPLY PIPING
Table 7- PROPANE GAS
Table 6 - NATURAL GAS
Pipe Capacity - BTU Per Hour Input
Includes Fittings
Pipe Capacity - BTU Per Hour Input
Includes Fittings
Length of
Pipe - Ft.
Length
of
Pipe - Ft.
Copper Tubing*
Iron Pipe
½"
¾"
1"
1¼"
⅝"
¾"
½"
¾"
20
40
92,000
63,000
190,000
130,000
350,000
245,000
625,000
445,000
20
40
60
131,000
90,000
72,000
216,000
145,000
121,000
189,000
129,000
103,000
393,000
267,000
217,000
60
50,000
105,000
195,000
365,000
*Outside diameter:
Measure length of pipe or tubing from gas meter or propane
second stage regulator.
15
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ELECTRICAL WIRING
Electric Power Supply
!
WARNING
Run a separate 115 volt circuit from separate over current
protective device 15 ampere circuit in electrical service
entrance panel.
Electrical shock hazard. Turn OFF electrical power
supply at service panel before making electrical
connections. Failure to do so could result in death
or serious injury.
Connect 115 volt power supply to terminals L1 (HOT) and
L2 inside J box.
Run 14 gauge or heavier copper wire from boiler to
grounded connection in service panel or properly driven
and electrically grounded ground rod.
Electrical Wiring
See wiring diagram Figure 10 page 18 for details.
Refer to Ladder Diagram from document envelope
received with boiler.
Thermostat Installation
Electrically bond boiler to ground in accordance with
requirements of authority having jurisdiction. Refer to:
1. Thermostat should be installed on an inside wall about
four feet above the floor.
• USA- National Electrical Code, ANSI/NFPA 70.
• Canada - Canadian Electrical Code, Part I, CSA C22.1:
Safety Standard for Electrical Installations.
2. NEVER install a thermostat on an outside wall.
3. Do not install a thermostat where it will be affected
by drafts, hot or cold pipes, sunlight, lighting fixtures,
televisions, a fireplace, or a chimney.
If any of the original wire as supplied with this appliance
must be replaced, it must be replaced with type 105°C
thermoplastic wire or its equivalent
4. Check thermostat operation by raising and lowering
thermostat setting as required to start and stop the
burners.
Circulator harness is factory wired to control module.
Connect harness to circulator in field. See Figure 9.
5. Instructions for the final adjustment of the thermostat
are packaged with the thermostat (adjusting heating
anticipator, calibration, etc.)
6. Set heat anticipator at .2 amps. 24 volt thermostat
connects to yellow low voltage wires labled T.
Figure 9 - Control Module Panel
J BOX
L1 & L2
BLOWER
TRANSFORMER
SECONDARY
RCULATOR
HARNESS
TRANSFORMER
THERMOSTAT WIRES
TRANSFORMER LINE VOLT
16
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SEQUENCE OF OPERATION
Sequence of Operation - Figure 10, Page 18.
1. Thermostat calls for heat, control relay contacts.
2. Circulator pump is powered through terminals C1 and
C2. Control holds off burner and attempts to satisfy
thermostat with residual boiler heat.
3. Induced draft blower and transformer primary are
powered.
4. When blower gets up to speed and blower suction
pressure reaches pressure switch set point, pressure
switch contacts close sending 24 volts to pilot control
from transformer secondary.
5. Pilot gas valve opens and spark initiates to light pilot
burner.
6. When pilot flame is proven, spark drops out.
7. Main gas valve opens and pilot burner ignites main
burners.
8. If boiler water temperature reaches high limit set
point, high limit contacts open, cutting power to
blower and pilot control. Burners extinguish and blower
stops. Circulator pump continues to run as long as
the thermostat continues to call for heat. When boiler
water temperature drops past the high limit set point
and through the differential, high limit contacts close,
repeating steps 3-7.
9. If venting system becomes blocked, blower suction
pressure will drop below pressure switch set point,
opening pressure switch contacts and cutting power to
pilot control. Burners will extinguish, but blower will
remain powered as long as thermostat continues to call
for heat. If venting system clears, steps 4-7 will repeat.
10. Thermostat is satisfied, ending call for heat. Relay coil
is de-energized, opening contacts. Burners extinguish.
Blower and circulator pump stop.
17
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WIRING DIAGRAMS
Figure 10 - Control Module
Damper is not an option.
18
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STARTING YOUR BOILER
NOTICE
Do not add water into hot empty boiler.
Filling System With Water
• Close air vents on all radiation units. Open valves to
these units.
• Verify boiler and expansion tank drain valves are closed.
Air bleed screw on tank drain fitting should be closed.
• Open valve in line from boiler to expansion tank.
• Open water inlet to your boiler and leave open.
• Start with lowest radiation unit. Open air vent on this
unit. When all air has escaped and water starts to flow
from vent, close it.
• Go to next radiation unit, and repeat this process.
• Repeat until you have covered every radiation unit in
system. End at highest unit in system.
• If units have automatic vents, manual venting is
unnecessary but it will speed up proper filling of system.
• If system is closed expansion tank system, you may
have automatic fill valve. Leave it open to refill system
automatically as needed.
• Check temperature-pressure gauge. Note position of
hand indicating pressure. This should be between 10
and 15 psi. Any lowering of this movable hand below
10 psi indicates loss of water due to leakage. Automatic
fill valve should compensate for this. Instructions are
packaged with valve.
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STARTING YOUR BOILER
Operating Instructions.
!
WARNING
1. STOP! Read Safety Information on previous page.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition device which
automatically lights the burner. Do not attempt to light
pilot by hand.
If you do not follow these instructions
exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
• This appliance is equipped with an ignition device
which automatically lights burner. Do NOT try to
light this burner by hand.
5. Remove burner access panel.
Figure 11 - Gas Control Knob
• Before operating smell all around appliance area
for gas. Be sure to smell next to floor because
some gas is heavier than air and will settle to the
floor.
•Use only your hand to turn the gas shutoff
valve. Never use tools. If valve will not turn by
hand, do not try to repair it, call a qualified ser-
vice technician. Force or attempted repair may
result in fire or explosion.
ON
INLET
OFF
GAS CONTROL KNOB
•Do not use this appliance if any part has
been under water. Immediately call a qualified
service technician to inspect appliance and to
replace any part of control system and any gas
control which has been under water.
SHOWN IN "ON" POSITION
6. Depress gas control knob slightly and turn clockwise
to “OFF” position.
7. Wait five (5) minutes to clear out any gas. If you then
smell gas STOP! Follow WHAT TO DO IF YOU SMELL
GAS. If you don’t smell gas, go to next step.
LIGHTING PROCEDURE FOR BOILER WITH
INTERMITTENT PILOT SYSTEM
8. Turn gas control knob counterclockwise
9. Turn on all electric power to the appliance.
10. Set thermostat to desired setting.
to “ON.”
For Your Safety, Read Before Operating!!
A. This appliance is equipped with an ignition device
which automatically lights the pilot. Do not try to light
appliance by hand.
11. After visually inspecting the flame, replace lower front
panel.
12. If appliance will not operate after several tries, turn gas
control knob to “OFF” and call your service technician
or gas supplier.
!
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
To Turn Off Gas To The Appliance
• Do not touch any electrical switches; do not use
any phone in your building.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if servicing is
to be performed.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
3. Depress gas control knob slightly and turn clockwise
to “OFF” position. Do not force.
• If you cannot reach your gas supplier, call the fire
department.
20
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CHECKING AND ADJUSTING
Figure 12 - Automatic Gas Valve
Gas Valve Safety Shutdown Test
!
WARNING
Electrical shock hazard. Follow instructions to turn
off electric power. Failure to do so could result in
death or serious injury.
Ignition system safety shutoff device must be tested after
placing boiler in operation.
With main burners firing, disconnect ignition cable from
intermittent pilot control box. Gas valve should shut off
main burners. TURN OFF ELECTRIC POWER to boiler before
reconnecting ignition cable, to prevent electric shock.
Adjust Pilot Burner
1. Remove screw cover over pilot adjusting screw.
2. Insert small screwdriver and adjust flame as needed
See Figure 12 & 13. Turn screw counterclockwise
to increase flame, clockwise to decrease.
Figure 13 - Pilot Flame Adjustment
Main Burner(S)
Main burners do not require primary air adjustment and are
not equipped with primary air shutters.
Main burner flames form sharp blue inner cones in softer
blue outer mantel, with no yellow. Puffs of air from blow-
ing on flame or stamping on floor will cause flames to turn
orange momentarily. This is not unusual. Remain still when
observing main burner flames. See Figure 14, Page 22
If flame appearance is not correct, check main burner
orifices, burner throat and flame ports for dust and lint
.
obstruction. It may be necessary to remove rollout shield
to observe main burner flames. Replace rollout shield after
observation.
Adjust Limit Controls
Instructions for each control are included with the controls.
Recommended Boiler Water Temperatures
Settings can be changed after you have had some idea how
the system works. Example: If your system does not give
enough heat in very cold weather, you can raise limit setting
to 190°F.
21
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CHECKING AND ADJUSTING
Figure 14 - Main Burner Flame
Adjust Thermostat Heat Anticipator
Instruction for final adjustment of thermostat are packaged
with thermostat.
1. Set Heat anticipator at .2.
2. Check thermostat operation. When set above
temperature indicated on thermometer, boiler burners
should ignite. Verify thermostat turns off boiler when
room temperature reaches selected setting and starts
boiler operating when room temperature falls few
degrees. After setting limit control to desired setting,
check to see if it shuts off gas supply to burners.
3. Turn your thermostat up to call for heat and let your
boiler run until temperature of water reaches limit
setting. Gas valve shuts off and circulator keeps
running until thermostat is satisfied, or water cools
enough to restart burners through limit control.
Main burner flame should form sharp blue inner mantel
with no yellow.
4. To check operation of contacts in pressure switch,
disconnect rubber tubing (located between blower and
pressure switch) from pressure switch, while boiler
is operating. Burners extinguish and blower keeps
running. When tubing is reconnected to pressure
switch, ignition sequence begins, resulting in ignition of
main burners.
5. Set thermostat for desired temperature.
Safe lighting and other performance criteria were met with
gas manifold and control assembly provided on boiler when
boiler underwent tests specified in ANSI Z21.13.
22
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MAINTAINING YOUR BOILER
Burners
Cleaning Your Boiler And Burners
Beginning of heating season visually check pilot and main Flue passages between sections should be examined yearly
burner flames. See Figures 13, and 14
.
and cleaned if necessary.
To clean:
Safety Relief Valve
• Remove burners, pilot, and vent pipe.
Test safety relief valve for proper operation. Refer to valve
manufacturer’s instructions packaged with relief valve.
• Remove top and front jacket panels.
• Remove two screws attaching intermediate front panel
to left and right side jacket panels.
Expansion Tank (Non-diaphragm)
• Remove control panel.
Tank may become waterlogged, or may receive excess
of air. Frequent automatic opening of safety relief
valve indicates water logging. High boiler temperature
accompanied by unusually low radiation unit temperature
(and “knocking”) indicates excess air in tank.
• Remove draft diverter and intermediate front panel.
• Carefully remove cerafelt gasket strips.
• Clean passageways between sections with flexible
handle wire brush. Remove dirt from bottom of boiler
and from between sections by vacuuming.
To correct:
1. Close valve between boiler and tank. Drain tank until
empty.
• Verify all flame ports in burners are open and clear.
Shake out or blow out all loose dirt in burners.
2. Check all tank plugs and fittings. Tighten as necessary.
• Reseal seams between adjacent sections as necessary
with 400° F RTV silicone sealant.
3. Open valve between boiler and tank. Water will rise to
normal height in tank if you have automatic fill valve
(otherwise, manually refill system).
• Reassemble all parts.
• Verify tightness of pilot connections and condition of
burner flames after reassembly. See Figures 13 and 14.
Boiler Flue Passages
Recommend following checked annually by qualified service
agent.
• Verify vent pipe connections to chimney are secure and
no obstructions are present.
• flue passages
Blower
• burner adjustment
Blower motor features permanently lubricated ball bearing
construction. Lubrication is not required.
• operation of controls
Before start of each season (or whenever system has been
shut down for some time) recheck whole system for leaks
and recheck boiler and vent pipe for leaks. Replace or patch
any boiler seals that are faulty. Before start of each season
(or whenever system has been shut down for some time)
recheck the whole system for leaks . . . and recheck the
boiler and vent pipe for leaks. Replace or patch any boiler
seals that are faulty.
Circulator Pump Isolation Valves
Operate isolation valves in circulator pump flanges
manually once or twice per year to prevent valves from
becoming stuck in open position
Rotate valves from open position to closed position and
back to open position.
Low Water Cutoff(s)
Vent Pipe
Inspect field sourced low water cutoffs annually or
as recommended by low water cutoff manufacturer.
Flush float type low water cutoff(s) per manufacturer’s
instructions.
Venting and piping should be checked at least monthly. If
vent piping shows any sign of leaking, replace immediately.
Water System
If system is to remain out of service during freezing
weather, always drain it completely (water left in to freeze
will crack pipes and/or boiler).
Housekeeping
• Keep boiler area clear and free from combustible
materials, gasoline and other flammable vapors and
liquids.
• Keep boiler area clear of debris and other materials
obstructing flow of combustion and ventilation air.
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SERVICE HINTS
You may avoid inconvenience and service calls by checking these points before you call for service:
!
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical 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 cannot reach your gas supplier, call the fire
department.
IF YOUR SYSTEM IS NOT HEATING OR NOT GIVING ENOUGH HEAT . . .
POSSIBLE CAUSE
WHAT TO DO
Thermostat is not set correctly
Reset thermostat
Check flame. If it is yellow, the burner is not getting enough air. Or, if
flame is blue and noisy and seems to lift off the burner, the burner is
getting too much air. Contact your service agency.
Burner is not operating properly
Check over-current protection. Check to be sure electric power supply
circuit is “ON”.
No electric power to boiler
Controls out of adjustment
Reset according to instructions.
Open radiator vents to excess air. Check flow control valve (if used). It
may be in closed position.
Radiators not heating
Circulating pump not running
Poor electrical contact
Check over-current protection. Check relay operation.
Check all control terminals and wire joints.
Pressure switch will not close and pilot spark will not operate to start
pilot. Have your service technician check and correct, if necessary.
Chimney flue is blocked
Have your service technician check heat exchanger for blockage. Replace
rollout switch with exact replacement.
Rollout switch blown
IF BURNER IS NOISY . . .
WHAT TO DO
POSSIBLE CAUSE
Gas input amount is incorrect
Contact your service technician.
RELIEF VALVE LEAKING . . .
POSSIBLE CAUSE
WHAT TO DO
Dirt on seat
Open valve manually. Allow water to run and clear valve seat.
Water logged expansion tank
Drain tank, see manufacurer instructions.
HAVE YOUR SERVICE AGENCY CHECK ANY PROBLEM YOU
ARE UNABLE TO CORRECT.
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EQUIPMENT & OPTIONAL ACCESSORIES
AIR ELIMINATING FITTING (AIR PURGER)
!
WARNING
Air purger is used to remove excess air from system. It
is installed in supply line. It will eliminate air from water
before it reaches radiators and bleed off this air.
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
MAIN AIR VENT FOR DOWN FLOW SYSTEMS OR
DIAPHRAGM TYPE EXPANSION TANK
SAFETY RELIEF VALVE
Safety relief valve is required on your boiler. Water expands
as it is heated. If there is no place for water to expand
into, water pressure will build up inside boiler and system.
Should this happen, safety relief valve will automatically
open at predetermined pressure. This will relieve the strain
on boiler and system. Run pipe from relief valve outlet
(pipe must be same size as outlet and open end must not
be threaded) to open drain, tub or sink, or other suitable
drainage point not subject to freezing. Failure to do so may
cause water damage or injury should safety relief valve
release.
Before system is filled with water, there is air in pipes and
radiation units. Some of it will be trapped as system is
filled . It is possible to eliminate most of this air through
air vent on radiation units. Main air vent will speed and
simplify this. Install on highest point in supply main when
all radiation is below top of boiler.
AUTOMATIC FILL VALVE
For a safe, efficient operation, hot water system must be
completely filled with water. Adding new water, when
needed can be done manually (by use of hand valve in
water supply line). Requires regular attention to system’s
needs. Automatic fill valve accomplishes this without
attention. Install in supply line on hot water boilers only.
Valve operates through water pressure differentials. It does
not require electrical connection.
EXPANSION TANK
Expanding water flows into expansion tank. Tank should
be correct size. Tank is filled with air. As water expands it
compresses air in the tank to form air pressure cushion.
This “spring-like” cushion serves to maintain correct
operating water pressure regardless of water temperature.
This assures “full measure” of water, even in highest
radiation unit of system. It also prevents blowing off of
safety relief valve. Air in tank in beginning (with system
filled with cold water) is sufficient for proper operation.
Tank also serves as trap for excess air in system. Air
would cause gurgling in pipes and in efficient circulation in
radiators if left in system.
DRAIN VALVE
Manual valve provides means of draining all water from
boiler and system. It is often installed in 3/4” tapping at
bottom of end boiler section. Or it can be installed in tee
where return line enters boiler.
It is possible for tank to become “waterlogged” (filled
with water). It can also become overfilled with air. This
can happen after filling system with new water. Fittings
provided on tank and in line to tank are for bleeding off
excess water or air.
WATER TEMPERATURE CONTROL
Water temperature limit control in relay is adjustable
and may be set as necessary. It may be set as low as
140°F, or as high as 220°F. This depends on type and
amount of radiation involved and weather conditions.
When installing this tank, it is important:
1. Tank be higher than boiler top.
CIRCULATING PUMP
2. Pipe to tank continuously rises up to tank (so air
Every forced hot-water system requires circulating pump.
Separate pump or zone valve is required for each zone,
if you have a two or more zone system. Pump must have
capacity to provide circulation required by your system.
Pump is connected into main just ahead of boiler. It is also
wired to electrical system.
can “bubble” up to it).
DIAPHRAGM TYPE EXPANSION TANK
Diaphragm type expansion tank takes place of conventional
expansion tank. Carefully read instructions packed with
your tank assembly.
Tank comes with 10-12 pounds per square inch air charge.
This is the same as pressure produced in system by
automatic fill valve. When system is first filled, tank will
contain little or no water.
As water is heated its pressure increases. It expands into
tank, compressing air in tank. Compressed air cushion
permits water in system to expand as temperature
changes. Diaphragm type tank can be mounted on air
purger fitting or at any convenient place in supply or return
line.
BLOWER (Draft Inducer)
Blower provides means for pulling air through boiler and
exhausting flue gasses into vent system. Blower shuts
off when burners are not firing. This keeps heat in house
rather than having it go up chimney.
25
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EQUIPMENT & OPTIONAL ACCESSORIES
PRESSURE SWITCH
Air pressure switch works on negative pressure. When
blower comes on air pressure switch operates intermittent
pilot and gas valve. Air pressure switch is factory set and
will only work when blower operates properly. It will not
allow boiler to come on if blower does not generate enough
pressure or if venting system is blocked.
Factory Pressure Switch Set point:
-0.4” wc. for 2-5 section boilers.
-0.5” w.c. for 6-7 section boilers.
ROLLOUT SWITCH
(FLAME ROLLOUT SAFETY SHUTOFF)
Rollout switch is temperature-sensitive fuse link device.
Located on boiler base just outside fire box. In event of
heat exchanger flueway blockage causing flame to roll
out of fire box, fuse does not change in appearance when
blown.
If rollout switch blows, it must be replaced with exact
replacement. Check heat exchanger flueways for blockage
when restoring system to operating condition. DO NOT
operate system without rollout switch.
26
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APPENDIX A - CONTROL MODULE
A.1 Installation Environment Considerations A.3 Adjusting Settings
To discourage unauthorized changing of settings, procedure
to enter adjustment mode is required.
!
WARNING
If you do not follow these instructions
exactly, a fire or explosion may result
causing property damage, personal injury
or loss of life.
To enter adjustment mode, press UP, DOWN, and I buttons
(see Figure 1) simultaneously for three seconds. Press and
release I button until parameter requiring adjustment is
displayed:
о “SP_” Setpoint (180 °F default setting; adjustable
•Do not use this appliance if any part has
been under water. Immediately call a qualified
service technician to inspect appliance and to
replace any part of control system and any gas
control which has been under water.
between 130 and 220 °F)
о “Df_” Setpoint Differential (15 °F default setting;
adjustable between 10 and 30 °F)
о “°F_” Degrees Fahrenheit
• Do not allow water to drip on controls. Prevent
condensation by allowing air circulation around
module and gas control.
Press UP or DOWN button until parameter has reached
desired value. After 60 seconds without any button inputs,
control automatically returns to READ mode.
• Do not use corrosive chemicals around or on
module or gas control.
A.4 Display
In RUN mode, status items and parameters are viewable.
• Install plastic cover.
Example, to display setpoint, control flashes “sp” (setpoint)
followed by temperature (i.e., 135), followed by °F or °C.
• Controls can be damaged by excessively high
temperatures. Verify adequate air circulation around
louvers is maintained when installing boiler.
To read settings, press and release I key to find parameter
of interest.
Example, press and release I until setpoint (sp) is
displayed, followed by three-digit number, i.e., 190,
followed by °F or °C. Press I button again will display (S1T)
Sensor 1 Temperature followed by three-digit number and
corresponding degree designator.
A.2 Electrical Connections
Connect Module Connectors Figure 10, Page 18
• L1& L2 leads inside J box using wire nuts. Secure J
box cover.
See Display Readout.
• Circulator harness to circulator. Harness comes
plugged into module with Molex® plug.
Figure 15 - Display Readout
• Thermostat connection to yellow wires marked TT
using wire nuts.
• Ensure remaining Molex® plug connectors have not
worked loose during transit.
• Check sensing bulb is fully inserted in well and is not
loose.
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APPENDIX A - CONTROL MODULE
2. Control determines burner operation is required,
A.5 Operation
Module continuously monitors boiler water temperature and
fires or shuts off burner based on this temperature data.
module proceeds to start burner (see state codes list)
and heats water in boiler until setpoint temperature is
achieved or thermostat is satisfied. .
1. When “Call for Heat” occurs, control enables circulator
and monitors boiler water temperature to determine
whether thermostat can be satisfied without firing
burners.
3. Burner is de-activated, ignition module completes heat-
ing cycle, returns to idle and waits for temperature to
drop again.
4. Circulator is turned on throughout “Call for Heat.”
Table 1 - Operation State Codes
State
Code
Definition
Explanation
Number
Idle
Standby - no call for heat
1
2
3
Heat request present. Boiler temperature sufficiently high to run circulator pump
only.
Circulator
Inducer is off. Control waits for pressure switch to open.
Wait for pressure switch
to open
Checked at beginning of heat cycle before turning on inducer.
If pressure switch does not open in 60 seconds, control goes to State 11.
Inducer is turned on. Control waits for pressure switch to close.
Checked at beginning of heat cycle after turning on inducer.
If pressure switch does not close in 60 seconds, control goes to State 12
System is purging before ignition trial; includes Pilot Valve circuit diagnostics.
System sparking. Flame is not present
Wait for pressure switch
to close
4
6
Pre-purge
Spark
Flame signal is being established. Variation in signal is allowed during this state,
flame must be stable at end of period
7
Flame stabilization
8
9
Running
System is running. Flame signal must be present.
System is purging at end of call for heat
Post-Purge
Retry delay
Recycle delay
Successful ignition was not detected, and delay is called before retry.
Flame signal was lost, and delay is called before retry
10
11
12
Wait for pressure switch
to open - failed to close
Inducer is still off. Pressure switch has not opened at beginning of heat cycle.
Alarm is sent, but no lockout occurs
Wait for pressure switch
to close - failed to open
Inducer is on. Pressure switch has not closed at beginning of heat cycle.
Alarm message is sent but no lockout occurs.
13
14
15
Soft lock-out
Soft lockout duration is one hour, may override with manual reset.
Manual reset is required for hard lockout
Hard lock-out
Wait for limit to close
Possible thermostat call for heat; limit switch is open.
Flame signal sensed before trial for ignition. Appropriate alarm is sent.
OR
16
17
Flame out of sequence
Flame signal sensed during post purge. Appropriate alarm is sent.
OR
Flame signal present when not expected. Appropriate alarm is sent.
Pilot valve circuitry diagnostics during pre-purge.
Pilot valve diagnostics
Self check performed at start up, again at beginning of heat cycle, and during
“Wait for Recovery “ State.
Current leakage detection
Self check performed at start up, again at beginning of heat cycle, and during
“Wait for Recovery “ State
Wait for recovery
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APPENDIX A - CONTROL MODULE
A.6 Boiler High Limit Temperature Controller
A.7 Troubleshooting
• When water temperature reaches setpoint, controller
ends heating cycle.
• Following service procedures are provided as general
guide.
• When water temperature drops below setpoint minus
differential, controller restarts heat cycle to re-heat
boiler water.
• On lockout and retry models, meter readings between
gas control and ignition module must be taken within
trial for ignition period. Once ignition module shuts
off, lockout models must be reset through key buttons
and display. On retry models, wait for retry or reset at
thermostat.
• If water temperature exceeds maximum allowed
temperature (220°F or 104°C), controller enters manual
reset lockout state.
• Check for correct installation and wiring before replacing
any component.
• For models having reset capability, press any onboard
button or cycle power to reset.
• Control module cannot be repaired. If it malfunctions, it
must be replaced.
Figure 16 - Basic Control Algorithm Example
• Use only qualified service agent to service ignition
systems.
1. Perform checkout as first step in troubleshooting.
2. Check troubleshooting guide to pinpoint cause of
problem. See Table 2, page 30.
3. If troubleshooting indicates ignition problem, see
Ignition System Checks to isolate and correct the
problem.
4. Perform checkout procedure following troubleshooting
guide again to verify system is operating normally.
A.8 Troubleshooting Error Codes
Integrated boiler control uses advanced diagnostic
capability to assist in troubleshooting error conditions.
Table 2 shows codes that could arise on integrated display
during fault.
Suggestions are provided in Table 8 for servicing these
potential errors.
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APPENDIX A - CONTROL MODULE
Table 2 - Troubleshooting Error Codes
Error
Code
Definition
Consequence
Number
Pressure switch failed to open (stuck closed).
2
4
Wait for recovery
Non critical alarm
Soft lockout
Flame current too low. Check for flame.
Flame sensed out of normal sequence (before opening or after closing gas valve).
Gas valve relays welded. Five consecutive soft lockouts.
Flame sensed during prepurge ( before gas valve signaled opened).
Flame sensed during postpurge (after gas valve signaled closed).
Pressure switch failed to close (Contacts stuck open)
6
18
23
24
29
Hard lockout
Soft lockout
Soft lockout
Wait for recovery
Sensor 1 error. Temperature sensor in well is not reading correctly.
Verify it is connected to board. Replace if necessary.
32
Wait for recovery
Igniter flame rod shorted to burner ground
57
58
59
Wait for recovery
Wait for recovery
Wait for recovery
Igniter flame rod shorted to burner ground. Repair or replace igniter.
Line Voltage error - voltage out of specification high or low (15-37V (44-66Hz))
Applies only to thermostats having on-board transformer.
Polarity is wrong in this case.
60
Wait for recovery
Thermostat input higher than threshold.
Line voltage unstable - possibly too may heavy loads switching on and off causing
erratic supply voltage.
61
62
Wait for recovery
Soft lockout
Soft lockout: maximum number of retries exceeded.
Soft lockout is reset after one hour if alarm reason disappears.
Soft lockout: maximum number of recycles exceeded.
63
64
Soft lockout
Soft lockout
Soft Lockout - electronics failure. On-board self diagnostics detected error.
Over temperature error. Sensor measured temperature in excess of maximum
allowable limit.
65
Soft lockout
Note: Soft lockout time is 1 hour or manual reset. Hard lockout requires manual reset.
STEP 2:
A.9 Intermittent Pilot
Verify ignition system grounding. Nuisance shutdowns are
often caused poor or erratic grounding.
Ignition System Checks
Common ground is required for module and pilot burner/
igniter sensor.
STEP 1: Check ignition cable.
• Verify ignition cable does not run in contact with metal
surfaces.
— Check for good metal-to-metal contact between
pilot burner bracket and the main burner.
• Verify only factory supplied Ignition cable (or approved
replacement) is used.
— Check ground lead from GND (BURNER) terminal
on module to pilot burner. Verify connections are
clean and tight. If wire is damaged or deteriorated,
replace with No. 14-18 gauge, moisture-resistant,
thermoplastic insulated wire with 105°C [221°F]
minimum rating.
• Verify connections to ignition module and igniter or
igniter-sensor are clean and tight.
• Verify ignition cable provides good electrical continuity.
— Check ceramic flame rod insulator for cracks or
evidence of exposure to extreme heat, which can
permit leakage to ground. Replace pilot burner/igniter
sensor and provide shield if necessary.
— If flame rod or bracket is bent out of position, restore
to correct position.
30
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APPENDIX A - CONTROL MODULE
STEP 3: Check spark ignition circuit.
Disconnect ignition cable at SPARK terminal on module.
• Recheck ignition sequence as follows.
— Reconnect main valve wire.
— Adjust thermostat above room temperature.
— Verify ignition sequence at burner.
!
WARNING
Electrical shock hazard. Ignition circuit generates
over 10,000 volts. Turn OFF electrical power
supply at service panel before making electrical
connections. Failure to do so could result in death
or serious injury.
— If spark does not stop after pilot lights, replace
module.
— If main burner does not light or if main burner lights
and system locks out, check module, ground wire
and gas control as described in troubleshooting Error
Codes. See Table 2 page 30.
Energize module and listen for audible sparking noise.
When operating normally, there should be buzzing noise
turns on and off twice per second for duration of 1–7
seconds, depending on model.
Figure 17 - Pilot Flame
STEP 4: Verify pilot and main burner lightoff.
• Initiate call for heat. Turn thermostat above room
temperature. Ignition sequence may be delayed by
thermal purge until boiler water temperature is below
140°F (60°C)
• Watch pilot burner during ignition sequence.
— Verify ignition spark continues after pilot is lit.
— Verify pilot lights and spark stops, verify main
burner does not light.
• If so, ensure adequate flame current as follows.
— Turn off boiler at circuit breaker or fuse box.
— Clean flame rod with emery cloth.
— Verify electrical connections are clean and tight.
Replace damaged wire..
— Check for cracked ceramic insulator, which can
cause short to ground, and replace igniter-sensor if
necessary.
— At gas valve, disconnect main valve wire from MV
terminal.
— Turn on power and set thermostat to call for heat. Pilot
should light, main burner will remain off because main
valve actuator is disconnected.
— Check pilot flame. Verify it is blue, steady and
envelops 3/8 to 1/2 in. [10 to 13 mm] of flame rod.
Figure 17 for possible flame problems and causes.
— If necessary, adjust pilot flame by turning pilot
adjustment screw on gas control clockwise to decrease
or counterclockwise to increase pilot flame. Following
adjustment, always replace pilot adjustment cover
screw and tighten firmly to assure proper gas control
operation. Figure 12, Page 21.
— Set temperature below room set-point to end call for
heat.
Correct Pilot Flame: 3/8 to 1/2 inch in flame.
See Figure 13, Page 21.
31
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PRODUCT LITERATURE
Lennox Industries Inc.
Dallas, Texas
Manufactured by:
ECR International, Inc.
2201 Dwyer Avenue, Utica NY 13501
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