Modine Manufacturing LM Manual

May, 2001
IINNSSTTAALLLLAATTIIOONNAANNDDSSEERRVVIICCEEMMAANNUUAALL
lloowwiinntteennssiittyyggaass--ffiirreeddpprreessssuurriizzeeddiinnffrraarreeddhheeaatteerrss
mmooddeellLLMM//HHMM
9-503.3
55HH7755228899AARReevv..CC
IMPORTANT
The use of this manual is specifically intended
for a qualified installation and service agency.
A qualified installation and service agency
must perform all installation and service of
these appliances.
FOR YOUR SAFETY
IF YOU SMELL GAS:
1. Open windows (indoor installation only).
2. Do not touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
The use and storage of gasoline or other
flammable vapors and liquids in open
containers in the vicinity of this unit is
hazardous.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, injury or death, and could cause
exposure to substances which have been
determined by various state agencies to
cause cancer, birth defects, or other
reproductive harm. Read the installation,
operating, and maintenance instructions
thoroughly before installing or servicing this
equipment.
THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.
CAUTION
As with all infrared equipment, clearances to
combustible material are critical. Be sure all
units have reflectors installed along the entire
length of the tube, and that they are not
mounted at an angle greater than 45° from the
horizontal plane.
To prevent premature heat exchanger failure do
not locate ANY gas-fired units in areas where
chlorinated, halogenated, or acid vapors are
present in the atmosphere.
IInnssppeeccttiioonnoonnAArrrriivvaall
1. Inspect unit upon arrival. In case of damage, report it
immediately to transportation company and your local
Modine sales representative.
2. Check rating plate on unit to verify that power supply
meets available electric power at the point of installation.
3. Inspect unit upon arrival for conformance with description
of product ordered (including specifications where
applicable).

22
SSPPEECCIIAALLPPRREECCAAUUTTIIOONNSS
SSPPEECCIIAALLPPRREECCAAUUTTIIOONNSS
THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN
THIS MANUAL MUST BE FOLLOWED TO PROVIDE SAFE,
EFFICIENT AND TROUBLE-FREE OPERATION. IN
ADDITION, PARTICULAR CARE MUST BE EXERCISED
REGARDING THE SPECIAL PRECAUTIONS LISTED BELOW.
FAILURE TO PROPERLY ADDRESS THESE CRITICAL
AREAS COULD RESULT IN PROPERTY DAMAGE OR LOSS,
PERSONAL INJURY, OR DEATH.THESE INSTRUCTIONS
ARE SUBJECT TO ANY MORE RESTRICTIVE LOCAL OR
NATIONAL CODES.
HHAAZZAARRDDIINNTTEENNSSIITTYYLLEEVVEELLSS
1. DDAANNGGEERR::Indicates an imminently hazardous situation
which, if not avoided, WILL result in death or serious injury.
2. WWAARRNNIINNGG::Indicates a potentially hazardous situation
which, if not avoided, COULD result in death or serious
injury.
3. CCAAUUTTIIOONN::Indicates a potentially hazardous situation
which, if not avoided, MAY result in minor or moderate
injury.
4. IIMMPPOORRTTAANNTT::Indicates a situation which, if not avoided,
MAY result in a potential safety concern.
DANGER
Appliances must not be installed where they may be
exposed to a potentially explosive or flammable atmosphere.
WARNING
1. All field gas piping should be pressure/leak tested prior
to operation. Never use an open flame. Use a soap
solution or equivalent for testing.
2. Gas pressure to the unit controls must never exceed
14" W.C. (1/2 psi).
3. Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage.
4. All appliances must be wired strictly in accordance with
the wiring diagram furnished with the unit. Any wiring
different from the wiring diagram could result in a
hazard to persons and property.
5. Any original factory wiring that requires replacements
must be replaced with wiring material having a
temperature rating of at least 105°C.
6. When servicing or repairing this equipment, use only
Modine-approve service replacement parts. A complete
replacement parts list may be obtained by contacting
Modine Manufacturing Company. Refer to the rating
plate on the unit for complete unit model number, serial
number, and company address. Any substitution of
parts or controls not approved by Modine will be at
owner’s risk.
CAUTION
1. Purging of air from gas lines should be performed as
described in ANSI Z223.1 – latest edition "National
Fuel Gas Code". or in Canada in CAN/CGA-B149
codes.
2. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and replace any gas control
which has been under water.
3. A built-in combustion air blower is provided – additional
external draft hoods (diverters) or power exhausters
are not required or permitted.
4. Installation must conform with local building codes or in
the absence of local codes, with Part 7, Venting of
Equipment, or the National Fuel Gas Code, ANSI
Z223.1 (NFPA 54) – latest edition. In Canada
installation must be in accordance with CAN/CGA-
B149.1 for natural gas units, and CAN/CGA-B149.2 for
propane units.
IMPORTANT
1. Approval requirements for infrared heaters specify that
the suspended type heaters shall be installed in
accordance with certain sections of the National Fire
Codes published by the National Fire Protection
Association and various ANSI standards. SOME of the
requirements are listed below.
AAiirrccrraaffttHHaannggaarrss::Approval requirements are contained
in the current edition of ANSI/NFPA 409 (or in
accordance with the enforcing authority for Canada).
PPuubblliiccGGaarraaggeess::Approval requirements are contained
in the current edition of NFPA 88B (CAN/CGA B149 for
Canada).
PPaarrkkiinnggSSttrruuccttuurreess::Approval requirements are
contained in the current edition of NFPA 88A.
GGeenneerraall::All installations must be in accordance with
the current edition of ANSI Z-223.1 (NFPA 54) National
Fuel Gas Code and the current edition of the National
Electric Code, ANSI/NFPA 70. For Canada,
installations must conform with local building codes, or
in the absence of local codes, in accordance with the
current edition of CAN/CGA B149 and the Canadian
Electric Code, C22.1.
2. Start-up and adjustment procedures should be
performed by a qualified service agency.
3. To check most of the Possible Remedies in the
troubleshooting guide listed in Tables 13.3 and 14.1,
refer to the applicable sections of the manual

33
SSII((MMEETTRRIICC))CCOONNVVEERRSSIIOONNFFAACCTTOORRSS//UUNNIITTLLOOCCAATTIIOONN//AAIIRRRREEQQUUIIRREEMMEENNTTSS
TTaabblleeooffCCoonntteennttss
General Information/Installation Codes . . . . . . . .1
Inspection on Arrival . . . . . . . . . . . . . . . . . . . . . .1
Special Precautions . . . . . . . . . . . . . . . . . . . . . .2
SI (Metric) Conversion Factors . . . . . . . . . . . . . .3
Unit Location . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Location Recommendations . . . . . . . . . . . . .3
Ventilation/Combustion Air Requirements . . . . . .3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Unit Btu/hr Conversion . . . . . . . . . . . . . . . . .4
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Clearances to Combustibles . . . . . . . . . . . . .4
General Installation Instructions . . . . . . . . . .5
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Gas Connections . . . . . . . . . . . . . . . . . . . . .8
Electrical Connections . . . . . . . . . . . . . . . . .9
Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . .9
Main Burner Adjustment . . . . . . . . . . . . . . .10
Control Operating Sequence . . . . . . . . . . . .11
Dimensions, Performance . . . . . . . . . . . . . . . . .12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . .13
Service/Replacement Parts Ordering . . . . . . . .15
Model Number Designations . . . . . . . . . . . .15
Serial Number Designations . . . . . . . . . . . .15
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
TTaabbllee33..11
SSII((MMeettrriicc))CCoonnvveerrssiioonnFFaaccttoorrss
UUnniittLLooccaattiioonn
LLooccaattiioonnRReeccoommmmeennddaattiioonnss
1. When locating the heater, consider the general space and
heating requirements and availability of gas and electrical
supply.
2. Be sure the structural support and chain/rod at the unit
location is adequate to support the weight of the unit.
3. Be sure that the minimum clearances to combustible
materials and for servicing are maintained. The minimum
clearances to combustibles are shown in Table 4.1, as well
as affixed to burner's CSA rating plate.
4. Mounting height (measured from the bottom of unit) at
which heaters are installed is critical. Please refer to
mounting height information in Table 12.3.
5. Do not locate units in areas where chlorinated,
halogenated, or acid vapors are present in the atmosphere.
VVeennttiillaattiioonn//CCoommbbuussttiioonnAAiirrRReeqquuiirreemmeennttss--
VVeenntteeddAApppplliiccaattiioonnss
To insure adequate combustion air, positive air displacement of
4 cfm per 1000 Btu/hr for natural gas and 5 cfm per 1000
Btu/hr for propane is required. Tightly constructed, well-
insulated buildings require mechanically powered systems, for
example, exhaust fans and fresh air intake openings. Exhaust
fans alone are not sufficient. Inlet air openings are required.
TTooCCoonnvveerrttMMuullttiippllyyBByyTTooOObbttaaiinn
"W.C.
(inches water column) 0.24 kPa
psig 6.893 kpa
°F subtract 32 and then °C
multiply by 0.555
inches 25.4 mm
feet 0.305 meters
cfm 0.028 m3/min
cfh 1.699 m3/min
btu/ft30.0374 mJ/m3
pound 0.453 kg
btu/hr 0.000293 kW/hr
gallons 3.785 liters
DANGER
Appliances must not be installed where they may be
exposed to a potentially explosive or flammable atmosphere.
CAUTION
As with all infrared equipment, clearances to combustible
material are critical.Be sure all units have reflectors installed
along the entire length of the tube, and that they are not
mounted at an angle greater than 45° from the horizontal
plane.
IMPORTANT
Approval requirements for infrared heaters specify that the
suspended type heaters shall be installed in accordance with
certain sections of the National Fire Codes published by the
National Fire Protection Association and various ANSI
standards. SOME of the requirements are listed below.
AAiirrccrraaffttHHaannggaarrss::Approval requirements are contained in the
current edition of ANSI/NFPA 409 (or in accordance with the
enforcing authority for Canada).
PPuubblliiccGGaarraaggeess::Approval requirements are contained in the
current edition of NFPA 88B (CAN/CGA B149 for Canada).
PPaarrkkiinnggSSttrruuccttuurreess::Approval requirements are contained in
the current edition of NFPA 88A.
GGeenneerraall::All installations must be in accordance with the
current edition of ANSI Z-223.1 (NFPA 54) National Fuel Gas
Code and the current edition of the National Electric Code,
ANSI/NFPA 70. For Canada, installations must conform with
local building codes, or in the absence of local codes, in
accordance with the current edition of CAN/CGA B149 and
the Canadian Electric Code, C22.1.

44
AAIIRRRREEQQUUIIRREEMMEENNTTSS//IINNSSTTAALLLLAATTIIOONN
VVeennttiillaattiioonn//CCoommbbuussttiioonnAAiirrRReeqquuiirreemmeennttss--
UUnnvveenntteeddAApppplliiccaattiioonnss
Maintain positive air displacement of 4 cfm per 1000 Btu/hr for
natural gas and 5 cfm per 1000 Btu/hr for propane. The fresh
air supply must be located in the immediate proximity of the
unit(s). Fresh air intake openings are typically located high on
the building sidewalls at a comparable level to the heaters.
One square inch of net free inlet area per 1000 Btu/hr is
required. Multiple inlets, well distributed, should be used and
should direct air upward to prevent drafts at floor level. Inlets
are typically limited to 1 to 2 square feet in size.
Modine recommends that units be interlocked with mechanical
exhaust fans for unvented applications. Mechanical exhaust
fans are typically located at high points of the building. For flat
roof areas, a series of small exhausters should be distributed
over the roof areas and interlocked with various heating zones.
UUttiilliizziinnggOOuuttssiiddeeCCoommbbuussttiioonnAAiirr((OOppttiioonnaall))
1. If utilizing outside combustion air, an accessory
combustion air intake collar is required.
2. All units may utilize a maximum of 20’of 4” O. D. fresh air
intake pipe with two (2) 90° elbows.
3. A minimum of 24” of intake pipe is recommended for
optimum operation.
4. Keep intake opening at least 5 feet from any exhaust vent
opening.
5. Insure that combustion air cap is protected from snow
blockage.
6. If utilizing outside combustion air, Modine recommends
using insulated pipe or schedule 40 PVC pipe to provide
fresh air and limit condensation from forming on outer
surface. A screened combustion air intake cap is required.
IInnssttaallllaattiioonn
UUnniittBBttuu//hhrrCCoonnvveerrssiioonn
If installing an infrared burner kit, ensure that the unit is
converted per kit instructions 9-559, latest revision, before
continuing with installation.
MMoouunnttiinngg
Be sure the means of suspension is adequate to support the
weight of the unit (see Tables 12.1 and 12.2 for system
weights). Where permissible, Modine recommends flexible
mounting. Modine offers chain mounting sets as an accessory.
In the absence of this chain set, Modine recommends Number
1/0 Tenso chain (200 lb. working load). “S” hooks should be a
minimum ¼” in diameter and the ends must be closed after
installation.
Under no circumstances should the gas supply line or the
electrical supply line to the heater provide any assistance in the
suspension of the heater. Do not locate any gas or electric
service lines directly above or below the heater.
Insure that:
1. Clearances to combustibles (as shown on the rating plate
and in Table 4.1) are maintained.
2. In locations used for storage of combustible materials,
signs shall be posted to specify the maximum permissible
stacking height to maintain required clearances from the
heater to the combustibles. See Figure 4.2.
3. Both gas piping and suspension mounting are flexible to
prevent fatigue failure from vibration or thermal expansion.
4. Adequate clearances to sprinkler heads are maintained,
which are dependent upon the setting of each individual
sprinkler head. As a guideline, LM/HM certified minimum
distance to combustible material is based on the
combustible material surface not exceeding 160°F.
TTaabbllee44..11
CCoommbbuussttiibblleeMMaatteerriiaallCClleeaarraanncceess①➁
MMiinniimmuummCClleeaarraanncceessttooCCoommbbuussttiibblleeMMaatteerriiaallss
MMooddeell((IInncchheess))
NNoo..TTooppBBoottttoommSSiiddeeFFrroonntt
““AA””““BB””““CC””““DD””
LLMM4400//55009 40 12 40
LMM66009 52 12 52
LLMM7755//8855//1100009 66 36 66
HHMM11225512 72 36 72
HHMM11550012 96 36 96
HHMM11775512 112 42 112
HHMM22000012 112 42 112
①Clearance to each end and above the U-tube is 12 inches.
➁In unvented applications, clearance to vent cap is 36”.
FFiigguurree44..11
CCoommbbuussttiibblleeMMaatteerriiaallCClleeaarraanncceess
FFiigguurree44..22
SSttaacckkiinnggHHeeiigghhtt
Stacking Height = Mounting Height – Minimum Clearance to
Combustible Material
"A" "A"
"B"
"C" "C"
"C"
"D"
Mounting
Height
Minimum Clearance to
Combustible Materials
Stacking
Height
0° Mounting Angle 1° to 45° Mounting Angle

1
2
345678
9'5"
9'5"
12"
➀ Suspension Means
➁Support Bracket
➂Burner
➃Tube & Reflector Hanger
➄Burner Tube
➅Clamp
➆Radiant Tube
➇Reflector
55
IINNSSTTAALLLLAATTIIOONN//VVEENNTTIINNGG
GGeenneerraallIInnssttaallllaattiioonnIInnssttrruuccttiioonnss
1. See Figure 5.1 for reference numbers of unit components.
FFiigguurree55..11
UUnniittCCoommppoonneennttss
2. The burner must be supported independently by
suspension means utilizing the support brackets (ref. #2),
which are an integral part of the burner box.
3. The first tube and reflector suspension point must be
located 12" from the burner box.The subsequent
suspension means must be installed approximately 9' 5"
apart, and must be perpendicular to the tube.
4. Fasten tube and reflector hangers (ref. #4) to the
suspension means (ref. #1) using “S” hooks, which must
be closed upon installation.
5. Starting from the burner end, insert first section of radiant
tube (ref. #7) with non-swedged end facing the burner (ref.
#3).
TThheewweellddeeddsseeaammmmuussttbbeeddiirreecctteeddttoowwaarrddfflloooorr..
6. The first tube of units with burners of 150,000 Btu/hr and
higher are constructed of titanium aluminized steel, and is
stenciled “First Tube” with high temperature paint. The two
clamps used with this tube are stainless steel. The
stainless steel tube clamps are recognizable due to the
high gloss finish. (See Figure 5.2 for a detailed picture
useful when installing stainless steel clamps). It essential
that these items be installed closest to the burner.
FFiigguurree55..22
IInnssttaallllaattiioonnooffSSttaaiinnlleessssSStteeeellCCllaammppss
7. Slide clamp onto burner section tube (ref. #5), but do not
tighten.
8. Insert second section of tube into first section. Slide clamp
over seam and tighten to 50 ft•lb.
9. Repeat this method until full length of radiant tube is
installed. The last section of radiant tube includes an air
turbulating baffle, and is marked “Last Tube” with high
temperature paint.
10. Unit must always be installed with reflector (ref. #8), which
must extend the full length of the tube system. A reflector
is not required over the U-tube for U-tube systems. The
reflector must be mounted at an angle from 0° to 45° from
the horizontal plane. Burner box must always remain level.
11. Slide reflectors through tube and reflector hangers
beginning 12" from burner box and overlap each reflector
4" for support during expansion and contraction of the
reflectors. Similarly, the ends of the complete reflector
system should extend beyond the first and last hangers by
at least 4" to ensure proper support.
12. Every other joint must be fastened together with self-
tapping sheet metal screws. For example,the first and
second reflectors are fastened, as are the third and fourth.
13. End cap must be fastened to end of reflector farthest from
burner using sheet metal screws.The end cap will cover
the discharge of the last tube.
AAddddiittiioonnaallRReeccoommmmeennddaattiioonnssffoorrOOuuttddoooorrIInnssttaallllaattiioonn
When utilized in an outdoor installation or in aircraft hangars,
abide by the following recommendations:
1. A screened combustion air intake cap is required.
2. Because of potentially windy environments, the burner must
be rigidly mounted using threaded rod to limit sideways
movement. The rest of the unit must still utilize flexible
mounting to allow for expansion and contraction of tubes.
3. Fasten reflectors to reflector hangers to eliminate
movement during windy conditions.
4. All electrical connections must be water tight and suitable
for outdoor use.
VVeennttiinngg
Modine model LM/HM is certified for use in vented or unvented
applications.
UUnnvveenntteeddAApppplliiccaattiioonnss
1. Insure that adequate combustion air and ventilation are
supplied to the space as specified on page 4 under
“Ventilation/Combustion Air Requirements - Unvented
Applications”.
2. An unvented unit must be terminated with one of the
following approved vent caps: Gary 1092, Briedert Type L,
Field Controls SK-4, Household Mfg. 365198, or Nu-Era
GFAS4.
3. Maintain 36” clearance to vent cap in any direction.
Joint
Joint
Self Drilling Screws
2nd Clamp
1st Clamp
First Tube 2nd Tube
BurBurner Tube 2nd Tube
Burner Tube
Burner
CAUTION
1. A built-in combustion air blower is provided – additional
external draft hoods (diverters) or power exhausters are
not required or permitted.
2. Installation must conform with local building codes or in
the absence of local codes, with Part 7, Venting of
Equipment, or the National Fuel Gas Code, ANSI
Z223.1 (NFPA 54) – latest edition. In Canada
installation must be in accordance with CAN/CGA-
B149.1 for natural gas units, and CAN/CGA-B149.2 for
propane units.

GGeenneerraallVVeennttiinnggIInnssttrruuccttiioonnss
The vent pipe may be installed in either a vertical or horizontal
method. Certified vent pipe lengths are as follows:
TTaabbllee66..11
MMaaxxiimmuummVVeennttLLeennggtthh
TTuubbeeLLeennggtthh((FFtt..))MMaaxxiimmuummVVeennttLLeennggtthh((FFtt..))➀
20 20
30 20
40 40
50 30
60 20
70 10
➀ Used in conjunction with a maximum of two (2) 90° elbows.
1. Do not use any vent pipe smaller than 4” in diameter.
Refer to the National Fuel Gas Code for the minimum
material thickness.
2. Avoid venting through unheated space when possible.
When single wall pipe does pass through an unheated
space, insulate runs greater than 5’ to minimize
condensation. Inspect for leakage prior to insulating and
use insulation that is noncombustible with a rating of not
less than 600°F. Install a tee fitting at the low point of the
vent system and provide a drip leg with a clean out cap as
shown in Figure 6.1. The drip leg should be cleaned
annually.
FFiigguurree66..11
VVeerrttiiccaallVVeennttiinngg
3. Type B vent can only be used to terminate the vent
system. The type B double wall vent must be one
continuous section.
4. All vents must be terminated with one of the following
approved vent caps: Gary 1092, Briedert Type L, Field
Controls SK-4, Household Mfg. 365198, or Nu-Era GFAS4.
5. Keep single wall vent pipe at least 6” from combustible
material. For double wall vent pipe maintain clearances
listed on vent pipe. The minimum distance from
combustible material is based on the combustible material
surface not exceeding 160°F.
6. Where the vent passes through a combustible wall or floor
or ceiling, a listed metal thimble 4” greater than the vent
diameter is necessary. If there are six feet or more of
vertical vent pipe in the open space between the unit
heater and where the vent pipe passes through the floor or
roof, the thimble need only be 2” greater than the diameter
of the vent pipe. If a thimble is not used, all combustible
material must be cut away to provide a 6 inch clearance.
Any material used to close an opening must be
noncombustible. Vent pipes must be adequately supported
and sealed with a 600°F RTV silicone sealant.
FFiigguurree66..22
CCoonnssttrruuccttiioonntthhrroouugghhCCoommbbuussttiibblleeFFlloooorroorrCCeeiilliinngg
7. The top of the vertical stack should extend at least 2’above
any portion of a building within a horizontal distance of 2’
(see Figure 6.1)
8. For pitched roof vertical venting, refer to the National Fuel
Gas Code for the vertical distance that the cap must
extend above the pitched roof (see Figure 6.3)
FFiigguurree66..33
VVeerrttiiccaallVVeennttiinnggtthhrroouugghhSSllooppeeddRRooooff
AAddddiittiioonnaallRReeqquuiirreemmeennttssffoorrHHoorriizzoonnttaallVVeennttiinngg
1. All horizontal vents must be terminated with one of the
following approved vent caps: Gary 1092, Briedert Type L,
Field Controls SK-4 or Household Mfg. 365198. In the
United States, the vent cap must be 24” from wall, while in
Canada, a distance of 48” from the wall is required.
2. When horizontal vents pass through a combustible wall (up
to 8 inches thick), use a thimble with 2” clearances to the
vent and insulate between thimble and vent. The vent
passage may also be constructed and insulated as shown
in Figure 6.2. Where horizontal vents pass through a non-
combustible wall, no clearances to the wall are required.
66
VVEENNTTIINNGG
Downward slope 1/4" towards drip leg.
Drip Leg
2' Min.
5' Min.
2' Min.
Listed cap
Listed cap
Flashing
Listed thimble to
maintain clearances
to combustibles as
specified by listed
thimble manufacturer
Double wall vent
section to maintain
clearance to
combustibles specified
by type B vent mfg.
Listed cap
Flashing
Single Wall Vent Pipe Single Wall Vent Pipe
Refer to
National Fuel
Gas Code
Refer to
N.F.G.C.
Listed Cap
Drip Leg
Downward slope 1/4" towards drip leg.

FFiigguurree77..11
VVeennttCCoonnssttrruuccttiioonntthhrroouugghhCCoommbbuussttiibblleeWWaallll
3. The vent system shall terminate at least 3’ above any
forced air inlet (except direct vent units) located within 10’,
and at least 4’ below, 4’ horizontally from, or 1’ above any
door, window or gravity air inlet into any building. The
bottom of the vent terminal shall be located above the
snow line or at least 1’ above grade; whichever is greater.
When located adjacent to public walkways the vent system
shall terminate not less than 7’ above grade.
4. Vent must extend beyond any combustible overhang of the
building.
5. The vent system shall not terminate over public walkways,
building entrances, or where condensate or vapor could
cause a nuisance or hazard or could be detrimental to the
operation of regulators, relief openings, or other equipment.
6. When vented horizontally, maintain a 1¼4” per foot rise
away from the heater. Place a drain tee and clean out near
the vent connector (see Figure 7.2). Where local
authorities have jurisdiction, a 1¼4” downward slope is
acceptable. Use a drain tee with a clean out near the exit of
the vent (see Figure 7.3) or allow the condensate to drip out
the end (see Figure 7.4).
FFiigguurree77..22
HHoorriizzoonnttaallVVeennttiinnggww//UUppwwaarrddPPiittcchh
FFiigguurree77..33
HHoorriizzoonnttaallVVeennttiinnggww//DDoowwnnwwaarrddPPiittcchh((ww//ddrriipplleegg))
FFiigguurree77..44
HHoorriizzoonnttaallVVeennttiinnggww//DDoowwnnwwaarrddPPiittcchh((ww//oouuttddrriipplleegg))
Note: In the United States, the vent cap must be 24” from wall,
while in Canada, a distance of 48” from the wall is required.
AAddddiittiioonnaallRReeqquuiirreemmeennttssffoorrCCoommmmoonnVVeennttiinngg
1. Only two identical units of the same Btu/hr rating and tube
length may be common vented utilizing a 6” diameter or
greater vent pipe.The individual vents can connect to the
common vent as shown in Figure 7.5 or 8.1.
2. The common vent system can be either horizontal or
vertical. For through-wall penetrations, refer to horizontal or
vertical vent instructions.
3. Both units must be controlled by one thermostat. Literature
number 9-410, Multiple Wiring of Low Intensity Infrared,
latest revision.
4. Limit the length of horizontal run to 3/4 the length of
vertical run when common venting vertically. Maintain
certified vent lengths.
5. The vent length of each unit must be identical.
6. If the system does not utilize a 4” x 4” x 6” wye as shown in
Figure 8.1, the individual vents must enter the common
vent at different levels, as shown in Figure 7.5.
FFiigguurree77..55
CCoommmmoonnVVeennttiinngg--IInnddiivviidduuaallVVeennttssEEnntteerriinnggaattDDiiffffeerreenntt
LLeevveellss
77
VVEENNTTIINNGG
Double wall vent
section to maintain
clearance to
combustibles specified
by type B vent mfg.
Listed thimble
to maintain
clearances as
specified by
listed thimble
manufacturer
Modine specified cap
Modine specified cap
Single Wall Vent Pipe
Single Wall Vent Pipe
See note
Clean out/drip leg
1/4" Slope up towards termination
Listed thimble
Modine specified cap
See note
Listed Thimble
Modine specified cap
1/4" Slope down towards termination
See note
See note
Listed Thimble
Modine specified cap
1/4" Slope down towards termination
Roof
Roof Flashing
Type "B" Vent
Rain Collar
4" Flue Pipe 4" Flue Pipe
6" Flue Pipe

88
GGAASSCCOONNNNEECCTTIIOONNSS
FFiigguurree88..11
CCoommmmoonnVVeennttiinnggUUttiilliizziinnggaa44""xx44""xx66""WWyyee
GGaassCCoonnnneeccttiioonnss
1. Installation of piping must conform with local building
codes,or in the absence of local codes, of the National Gas
Fuel Code, ANSI Z223.1 (NFPA 54) – Latest Edition.
In Canada, installation must be in accordance with
CAN/CGA-B149.1 for natural gas units and CAN/CGA-
B149.2 for propane units.
2. Piping to units should conform with local and national
requirements for type and volume of gas handled, and
pressure drop allowed in the line. Refer to Table 11.1 to
determine the cubic feet per hour (cfh) for the type of gas
and size of unit to be installed. Using this cfh value and
length of pipe necessary, determine the pipe diameter
from Table 9.1. Where several units are served by the same
main, the total capacity, cfh, and length of main must be
considered. Avoid pipe sizes smaller than 1/2”. Table 9.1
allows for a 0.3” W.C. pressure drop in the supply pressure
from the building main to the unit. The inlet pressure to the
unit must be 6-14” W.C. for natural gas and 11-14” W.C. for
propane gas. When sizing the inlet gas
pipe diameter, make sure that the unit supply pressure can
be met after the 0.3” W.C. has been subtracted. If the 0.3”
W.C. pressure drop is too high, refer to the Gas Engineer’s
Handbook for other gas pipe capacities.
3. Install a ground joint union with brass seat and a manual
shutoff valve adjacent to the unit for emergency shut-off and
easy servicing of controls, including a 1/8” NPT plugged
tapping immediately upstream of the gas supply connection
to the heater, accessible for test gauge connection. See
Figure 8.2.
4. Installation of a sediment trap in the gas supply line before
each unit is required to minimize the possibility of loose
scale or dirt within the gas supply line entering the heater
gas control system. See Figure 8.2.
5. An approved flexible connector may be used (local codes
permitting) as a convenient method of connecting the
heaters to the gas supply and to avoid placing stress on
the gas supply line. During operation tubes will expand in
the length.To avoid stress, the installation of the flexible gas
connector must be made to accommodate the expansion of
the low intensity infrared tubes.
6. Certified flexible connectors are recommended to be
installed as illustrated in Figures 8.3 and 8.4, in one plane
without sharp bends, kinks or twists.The gas take off from
the drop line must be parallel to the burner gas inlet
connection.
7. When pressure/leak testing pressures above 14” W.C. (1/2
psi), close the field installed shut-off valve, disconnect the
unit, and its combination gas control from the gas supply
line, and plug the supply line before testing. When testing
pressures 14” W.C. (1/2 psi) or below, close the manual
shut-off valve on the unit before testing.
FFiigguurree88..22
RReeccoommmmeennddeeddSSeeddiimmeennttTTrraapp//MMaannuuaallSShhuutt--OOffffVVaallvvee
IInnssttaallllaattiioonn
FFiigguurree88..33
RReeccoommmmeennddeeddIInnssttaallllaattiioonnooffFFlleexxiibblleeGGaassCCoonnnneeccttoorr--
SSiiddeeVViieeww
FFiigguurree88..44
RReeccoommmmeennddeeddIInnssttaallllaattiioonnooffFFlleexxiibblleeGGaassCCoonnnneeccttoorr--
EEnnddVViieeww
4" x 4" x 6" WYE
4" Flue Pipe
Rain Collar
Type "B" Vent
Roof Flashing Roof
4" Flue Pipe
6" Flue Pipe
WARNING
1. All field gas piping must be pressure/leak tested prior
to operation. Never use an open flame. Use a soap
solution or equivalent for testing.
2. Gas pressure to unit controls must never exceed 14”
W.C. (1/2 psi).
GAS
SUPPLY LINE
GAS
SUPPLY LINE
GROUND
JOINT
UNION
W/ BRASS
SEAT
MANUAL GAS
SHUT-OFF VALVE
3"
MIN.
SEDIMENT
TRAP
PLUGGED
1/8" NPT TEST
GAGE CONNECTION
TO
CONTROLS
Certified Flexible
Gas Connector
Gas Supply
Piping
Manual
Valve
Burner Box
Movement
Alternate
Supply
Locations

TTaabbllee99..11
GGaassPPiippeeCCaappaacciittiieess
EElleeccttrriiccaallCCoonnnneeccttiioonnss
1. Installation of wiring must conform with local building
codes, or in the absence of local codes, of the National
Electric Code ANSI/NFPA 70 - Latest Edition. Unit must be
electrically grounded in conformance to this code. In
Canada, wiring must comply with CSA C22.1 Part 1,
Electrical Code.
2. Provide only the voltage to the heater as stamped on the
heater serial plate.
3. The power supply to the unit should be protected with a
fused disconnect switch.
4. The heater is not to be energized until gas is available at
the heater. Failure to observe this point may result in
failure of control components.
5. Control wire used to connect the heater to the thermostat
must have adequate ampacity and insulation temperature
rating for the total connected load.
6. Wiring must not be located directly above or below the
heater to avoid overheating of the wires.
7. All electrical connections must be water tight and suitable
for outdoor use.
8. Ensure proper AC wiring of unit and power source.
SSTTAARRTT--UUPPPPRROOCCEEDDUURREE
1. Turn off power to the unit at the disconnect switch. Check
that fuses or circuit breakers are in place and sized
correctly. Turn all hand gas valves to the “OFF” position.
2. Check that the supply voltage matches the unit supply
voltage listed on the serial plate. Verify that all wiring is
secure and properly protected. Trace circuits to insure the
unit has been wired according to the wiring diagram.
3. If utilizing indoor air for combustion and an unvented
situation, insure adequate ventilation for intake of fresh air
and adequate exhaust of products of combustion.
4. Perform a visual inspection of the unit to make sure no
damage has occurred during installation.
5. Recheck the gas supply pressure. The inlet pressure to the
unit must be 6-14”W.C. for natural gas and 11-14”W.C. for
propane gas. The gas supply pressure must never exceed
14” W.C. If the pressure exceeds 14” W.C., a gas pressure
regulator must be added upstream of the combination gas
valve.
6. Open the field installed manual shutoff valve and turn
power on to the unit.
7. Check to make sure that the main gas valve opens upon a
call for heat from the thermostat.
8. Check to insure that gas controls sequence properly (See
Control Operating Sequence, page 11).
99
EELLEECCTTRRIICCAALLCCOONNNNEECCTTIIOONNSS//SSTTAARRTT--UUPPPPRROOCCEEDDUURREE
Gas Pipe Capacities (Up to 14” W.C. Gas Pressure through Schedule 40 Pipe)
Cubic Feet per Hour with Pressure Drop of 0.3” W.C.
Natural Gas Specific Gravity – 0.60, Propane Specific Gravity – 1.50
Length Pipe Diameter (Inches)
Of Pipe 1/2 3/4 1 1-1/4 1-1/2 2
(Ft) Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane
10 132 83 278 175 520 328 1050 662 1600 1008 3050 1922
20 92 58 190 120 350 221 730 460 1100 693 2100 1323
30 73 46 152 96 285 180 590 372 890 561 1650 1040
40 63 40 130 82 245 154 500 315 760 479 1450 914
50 56 35 115 72 215 135 440 277 670 422 1270 800
60 50 32 105 66 195 123 400 252 610 384 1150 725
70 46 29 96 60 180 113 370 233 560 353 1050 662
80 43 27 90 57 170 107 350 221 530 334 990 624
90 40 25 84 53 160 101 320 202 490 309 930 586
100 38 24 79 50 150 95 305 192 460 290 870 548
125 34 21 72 45 130 82 275 173 410 258 780 491
150 31 20 64 40 120 76 250 158 380 239 710 447
WARNING
Disconnect power supply before making wiring connections
to prevent electrical shock and equipment damage.
All units must be wired strictly in accordance with wiring
diagram furnished with the unit. Any wiring different from
the wiring diagram could result in a hazard to persons and
property.
Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature rating
of at least 105°C.
CAUTION
Purging of air from gas lines should be performed as
described in ANSI Z223.1 - Latest Edition “National Fuel
Gas Code”, or in Canada, CAN/CGA-B149 codes.
IMPORTANT
Start-up and adjustment procedures should be performed
by a qualified service agency.

BBeeffoorreeyyoouussttaarrttuusseetthheeffoolllloowwiinnggsstteeppssttoovveerriiffyytthhaatttthhee
vveennttiinnggssyysstteemmiissaaddeeqquuaatteellyyssiizzeedd::
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code ANSI
Z223.1 or CAN/CGA B149.1 or .2 Installation Code –
latest edition and these instructions. Determine that there
is no blockage or restriction, leakage, corrosion and other
deficiencies, which could cause an unsafe condition.
3. In so far as practical, close all building doors and windows
and all doors between the space in which the unit(s)
connected to the venting system are located and other
spaces of the building. Turn on any exhaust fans so they
shall operate at maximum speed. Do not operate a
summer exhaust fan.
4. Place the unit being inspected in operation. Adjust
thermostat so that the unit will operate continuously.
5. After it has been determined that each unit connected to
the venting system properly vents when tested as outlined
above, return doors, windows, exhaust fans, and any other
gas-burning unit to their previous condition of use.
6. If improper venting is observed during any of the above
tests, the venting system must be corrected.
7. If the venting system must be resized, it must conform with
the National Fuel Gas Code ANSI Z223.1 or CAN/CGA
B149.1 or .2 Installation Code – latest edition. If the
venting system must be resized, it should be resized to
approach the minimum size as determined using the
appropriate table in Appendix G of the National Fuel Gas
Code ANSI Z223.1.
MMaaiinnBBuurrnneerrAAddjjuussttmmeenntt
The gas pressure regulator (integral to the combination gas
control) is adjusted at the factory for average gas conditions. It
is important that gas be supplied to the heater in accordance
with the input rating on the serial plate. Actual input should be
checked and necessary adjustments made after the heater is
installed. Over-firing, a result of too high an input, reduces the
life of the unit and increases maintenance. Under no
circumstances should the input exceed that shown on the serial
plate.
Measuring the manifold pressure is done at the manifold
pressure tap on the main gas valve on the heater (see Figures
10.1 & 10.2).
TTooaaddjjuusstttthheemmaanniiffoollddpprreessssuurree::
1. The correct manifold pressure is 5” W.C. for natural gas
and 10” W.C. for propane gas. Adjust the main gas
pressure regulator spring to achieve the proper manifold
pressure (see Figures 10.1 & 10.2).
2. Move the field installed manual shut-off valve to the “OFF”
position.
3. Remove the 1/8” pipe plug in manifold pressure tap in
combination gas control and attach a water manometer of
“U” tube type that is at least 12” high.
4. Replace cover of burner box to insure pressure switch will
sense accurate pressure.
5. Move the field installed manual shut-off valve to the “ON”
position.
6. Create a call for heat from the thermostat.
7. After adjustment, move the field installed manual shut-off
valve to the “OFF” position, remove burner box cover and
replace the 1/8” pipe plug. Replace burner box cover.
8 After the plug is in place, move the field installed manual
shut-off valve to the “ON” position and recheck pipe plugs
for gas leaks with a soap solution.
FFiigguurree1100..11
CCoommbbiinnaattiioonnGGaassVVaallvvee//IIggnniittiioonnCCoonnttrroolllleerr--
LLMM4400tthhrroouugghhHHMM115500
FFiigguurree1100..22
GGaassVVaallvvee--HHMM117755&&220000
1100
SSTTAARRTT--UUPPPPRROOCCEEDDUURREE
Manifold Pressure Tap
Ignition System
Control Switch
Regulator
Spring
(under cap)
Inlet Pressure Tap
Regulator
Spring
(under cap)
Inlet
Pressure
Tap
Control Knob
Manifold
Pressure
Tap

1111
SSTTAARRTT--UUPPPPRROOCCEEDDUURREE
TTaabbllee1111..11
MMaanniiffoollddPPrreessssuurreeaannddGGaassCCoonnssuummppttiioonn
Type of Gas Natural Propane
Model Btu/ft31040 2500 No. of
Size Specific Gravity 0.60 1.53 Orifices
Manifold Pressure ” W.C. 5.0 10.0
cfh 38.4 16.0
Orifice Drill Size #36 #49
cfh 48.1 20.0
Orifice Drill Size #31 #45
cfh 57.7 24.0
Orifice Drill Size #30 #43
cfh 72.1 30.0
Orifice Drill Size #21 #37
cfh 81.7 34.0
Orifice Drill Size #18 #34
cfh 96.2 40.0
Orifice Drill Size #13 #30
cfh 120.2 50.0
Orifice Drill Size #6 #28
cfh 144.2 60.0
Orifice Drill Size #2 #23
cfh 168.3 70.0
Orifice Drill Size B 19
cfh 192.3 80.0
Orifice Drill Size D #16
CCOONNTTRROOLLOOPPEERRAATTIINNGGSSEEQQUUEENNCCEE
LLMM4400tthhrroouugghhHHMM115500
These models utilize a combination gas valve/ignition controller
and a single stage thermostat.
1. The thermostat calls for heat.
2. The combustion air blower is energized and begins a
fifteen to thirty (15-30) second pre-purge cycle. The pre-
purge clears any residual gas left over from the previous
operation.
3. The pressure switch closes during the pre-purge,
energizing the amber indicator light.
4. After the pre-purge, the hot surface igniter is energized and
begins a seventeen (17) second warm-up period.
5. After this warm-up period, the gas valve is energized.
6. The main gas valve opens and the hot surface igniter
attempts to light the gas at the burner. Ignition trial time is
7 seconds. The hot surface igniter attempts to light the gas
during this ignition trial time.
7. Upon proper ignition, the unit continues to operate until the
thermostat is satisfied, at which time the thermostat
contacts open and de-energize the main gas valve until
another call for heat from the thermostat.
8. If a flame is not sensed for any reason, the main gas valve
will close and there will be a short purge period before
ignition is tried again.
9. If flame is not sensed after four tries, there will be at least a
one hour wait before ignition is tried again. Power can be
interrupted during this one-hour lockout to reset the
sequence of operation.
HHMM117755aannddHHMM220000
These models utilize a single-stage combination gas control, an
ignition control, and a single-stage thermostat.
1. The thermostat calls for heat.
2. The combustion air blower is energized and begins a ten
(10) second pre-purge cycle. The pre-purge clears any
residual gas left over from the previous operation.
3. The pressure switch closes during the ten (10) second pre-
purge, energizing the amber indicator light.
4. After the ten (10) second pre-purge, the hot surface igniter
is energized and begins a forty-five (45) second warm-up
period.
5. After this warm-up period, the gas valve is energized.
6. The main gas valve opens and the hot surface igniter
attempts to light the gas at the burner. Ignition trial time is
7 seconds. The hot surface igniter attempts to light the gas
during this trial time
7. Upon proper ignition, the unit continues to operate until the
thermostat is satisfied, at which time the thermostat
contacts open and de-energize the main gas valve until
another call for heat from the thermostat.
8. If ignition is not proven (the burner does not light) within
seven (7) seconds, the system will lockout, de-energizing
the gas valve and ignition control system. The sequence
will try three (3) times beginning with the pre-purge cycle
then hot surface igniter 45 second warm-up period.
9. If ignition is not proven after three tries, the system will
lockout for one (1) hour, after which it will try the full
sequence again. Power can be interrupted during this one-
hour lockout to reset the sequence of operation.
1
1
1
1
1
1
1
1
1
1
LM 40
LM 50
LM 60
LM 75
LM 85
LM 100
HM 125
HM 150
HM 175
HM 200

FFiigguurree1122..11
LLMM//HHMMBBuurrnneerrDDrraawwiinngg
TTaabbllee1122..11
TTuubbeeSSyysstteemmssDDaattaa
SSttrraaiigghhttTTuubbeeUU--TTuubbeeSSyysstteemm
TTuubbeeLLeennggtthh((FFtt..))System Length “A” System Length “B”
(Ft.) System Weight (Lb.) (Ft.) System Weight (Lb.)
20 23 78 13 89
30 33 112 18 132
40 43 146 23 157
50 53 180 28 200
60 63 214 33 225
70 73 252 38 277
TTaabbllee1122..22
BBuurrnneerrSShhiippppiinnggWWeeiigghhttss
MMooddeellSShhiippppiinnggWWtt..((LLbb..))
All LM/HM Burners 43
TTaabbllee1122..33
PPeerrffoorrmmaanncceeMMooddeellNNuummbbeerr
LM 40 LM 50 LM 60 LM 75 LM 85 LM 100 HM 125 HM 150 HM 175 HM 200
Btu/hr Input 40,000 50,000 60,000 75,000 85,000 100,000 125,000 150,000 175,000 200,000
20, 30 20, 30 30, 40 30, 40 40, 50 40, 50 50, 60 40, 50
40 40 50 50, 60 60 60, 70 70 60, 70
Recommended
Mounting 10 – 12 10 – 12 10 – 12 12 – 14 12 – 14 12 – 14 15 – 22 15 – 22 18 – 28 20 - 30
Height (Ft.)➀
➀ Mounting height values are recommendations for full building heat only and may need to be adjusted to meet requirements of actual installation.
1122
DDIIMMEENNSSIIOONNSS//PPEERRFFOORRMMAANNCCEE
B
A
Tube Lengths (Ft.) 20, 30 20, 30

1133
MMAAIINNTTEENNAANNCCEE//TTRROOUUBBLLEESSHHOOOOTTIINNGG
MMAAIINNTTEENNAANNCCEE
A qualified gas service personnel should service all heating
equipment before each heating season to assure proper
operation. The following items may require more frequent
service based on the environment in which the unit is installed,
and how long the unit is operated.
BBuurrnneerrAAsssseemmbbllyy
Disconnect all electrical power to the heater and close the gas
supply valve installed adjacent to the heater. With an air hose
regulated to 15 psig maximum, blow off any dust and dirt that
has accumulated on the heater.
LLEEDDDDiiaaggnnoossttiiccCCaappaabbiilliittyy
The LED on the ignition controller indicates the condition of the
control system. The diagnostic codes and their respective
definitions follow:
BBuurrnneerrOOrriiffiiccee
Remove burner orifice, clean, and reinstall on the heater
manifold. Drill sizes can be found in Table 11.1.
CCoommbbuussttiioonnAAiirrBBlloowweerr
The combustion air blower should be cleaned and lubricated
every six months of operation. Use ten (10) drops of SAE 10W
or 20W non-detergent oil.
EElleeccttrriiccaallWWiirriinngg
The electrical wiring should be checked annually for loose
connections or deteriorated insulation.
GGaassPPiippiinngg&&CCoonnttrroollss
The gas valves and piping should be checked annually for
general cleanliness and tightness. The gas controls should be
checked to insure that the unit is operating properly.
IMPORTANT
To check most of the Possible Remedies in the
troubleshooting guide listed in Tables 13.3 and 14.1, refer to
the applicable sections of the manual.
TTaabbllee1133..11
LLEEDDDDiiaaggnnoossttiiccCCaappaabbiilliittyy--LLMM4400tthhrroouugghhHHMM115500
FFLLAASSHHEESSRREEAASSOONN
Off No power to system
Bright-Dim Normal operation
2 Pressure switch closed longer than 30 seconds
3 Pressure switch open longer than 30 seconds
5 Flame signal sensed out of sequence
6 System lockout
TTaabbllee1133..33
TTrroouubblleesshhoooottiinngg
TTrroouubblleePPoossssiibblleeCCaauusseePPoossssiibblleeRReemmeeddyy
No Gas 1. Main gas is off. 1. Open manual gas valve.
2. Power supply is off. 2. Turn on main power.
3. Air in gas line. 3. Purge gas line.
4. External regulator malfunctioning. 4. Replace external regulator.
5. External regulator reversed. 5. Remove and properly install regulator.
Thermostat contacts 1. Defective thermostat. 1. Replace thermostat.
closed, no unit operation 2. Power supply is off. 2. Turn on main power.
3. Loose or disconnected wire. 3. Replace as required.
4. Defective combustion air blower. 4. Lubricate, repair or replace as required.
5. Blown fuse. 5. Replace fuse.
Combustion air blower 1. Loose or disconnected wire. 1. Replace as required.
operates, hot surface igniter 2. Restricted exhaust vent. 2. Remove restrictive object(s).
is not energized 3. Restricted or defective pressure switches. 3. Clean pressure switch line or replace
pressure switch.
4. Defective hot surface igniter. 4. Replace hot surface igniter.
5. Control box cover open. 5. Replace cover to closed position.
TTaabbllee1133..22
LLEEDDDDiiaaggnnoossttiiccCCaappaabbiilliittyy--HHMM117755&&HHMM220000
FFLLAASSHHEESSRREEAASSOONN
0 No power or proper operation
1 Failed ignition lockout
2 Loss of flame (3 times in one call for heat)
3 Internal fault
4 Pressure switch stuck open (10 seconds)
5 Pressure switch stuck closed (46 seconds)

TTaabbllee1144..11
TTrroouubblleesshhoooottiinnggCCoonnttiinnuueedd
TTrroouubblleePPoossssiibblleeCCaauusseePPoossssiibblleeRReemmeeddyy
Burner fires but cycles 1. Reversed polarity of the AC wiring 1. Check for proper AC wiring of unit
after lit for 5-10 seconds at the unit. and power source.
Burner fires but cycles 1. Defective gas valve and/or ignition 1. Replace gas valve and/or ignition
after lit for over 1 minute controller. controller.
2. No electrical power to gas valve. 2. Check wiring to gas valve.
3. Unit not properly grounded. 3. Properly ground unit.
4. Defective flame sensor. 4. Replace flame sensor.
5. Improper thermostat wiring. 5. Verify wiring compared to diagram.
6. Manual valve closed on combination 6. Turn knob to ON position on combination
gas valve. gas valve.
Hot surface igniter fails 1. Hot surface igniter improperly positioned. 1. Relocate to correct position.
to ignite burner 2. Hot surface igniter cracked. 2. Replace hot surface igniter.
3. Hot surface igniter wiring is loose or 3. Replace as required.
damaged.
4. Low manifold gas pressure. 4. Provide proper gas pressure.
5. Gas valve fails to open. 5. Replace gas valve.
6. Ignition detection control defective. 6. Replace ignition control module.
Heater will not turn off 1. Defective thermostat. 1. Repair or replace thermostat.
2. Gas valve stuck open. 2. Replace gas valve.
3. Unit undersized. 3. Check design conditions.
If the unit is undersized, additional
heater(s) may be required.
Carbon formation inside 1. Misaligned or incorrect orifice. 1. Insure proper alignment or replace orifice.
burner tube 2. Low or high gas pressure. 2. Provide proper gas pressure.
3. Wrong gas supplied to the heater. 3. Check label for gas required.
Low heater output 1. Low inlet or manifold gas pressure. 1. Adjust to proper gas pressure.
2. Orifice partially blocked with foreign 2. Remove orifice, clean, and reinstall.
matter.
3. Products of combustion not adequately 3. Provide adequate ventilation for
vented. products of combustion.
4. Manifold misaligned from excessive 4. Replace the manifold.
torque applied at time of gas pipe
installation.
5. Gas supply piping too small. 5. Replace piping or increase gas
supply pressure.
6. Unit undersized. 6. Check design conditions.
If unit is undersized, an additional
unit(s) or other heat source must
be added.
Gas odor 1. Loose pipe connection 1. Check all connections with a soap
solution and tighten as necessary.
1144
TTRROOUUBBLLEESSHHOOOOTTIINNGG

1155
SSEERRVVIICCEE
FFOORRSSEERRVVIICCIINNGG
If a qualified service agent cannot solve a problem with the installation, please consult with your local gas company or Modine
representative.
The serial plate is located on the side of the burner. For a complete description of the Model Number or Serial Number, see
Figures 15.1 and 15.2.
FFiigguurree1155..11
MMooddeellNNuummbbeerrDDeessiiggnnaattiioonnss
FFiigguurree1155..22
SSeerriiaallNNuummbbeerrDDeessiiggnnaattiioonnss
WARNING
When servicing or repairing this equipment, use only Modine-approved service replacement parts. A complete replacement parts
list may be obtained by contacting Modine Manufacturing Company. Refer to the rating plate on the unit for complete unit model
number, serial number, and company address. Any substitution of parts or controls not approved by Modine will be at owner’s
risk.
LLMM110000HH3344
LM - Low Intensity
Pressurized Infrared
Heater 40 to 100 MBH
HM - Low Intensity
Pressurized Infrared
Heater 125 to 200 MBH
MMBBHHIInnppuutt
40 - 40,000 Btu/hr Input
50 - 50,000 Btu/hr Input
60 - 60,000 Btu/hr Input
75 - 75,000 Btu/hr Input
85 - 85,000 Btu/hr Input
100 - 100,000 Btu/hr Input
125 - 125,000 Btu/hr Input
150 - 150,000 Btu/hr Input
175 - 175,000 Btu/hr Input
200 - 200,000 Btu/hr Input
CCoonnttrroollCCooddee
34 - Natural Gas,
115V/24V, 3 trial ignition,
100% shut-off with soft
lockout
74 - Propane Gas,
115V/24V, 3 trial ignition,
100% shut-off with soft
lockout
Hot Surface Ignition
BBlloowweerrVVeennddoorrCCooddee
11 - Dayton
30 - Fasco
SSeerriieessIIddeennttiittyyNNuummbbeerr
Identifies series of controls
WWeeeekkooffMMaannuuffaaccttuurree
01 - 1st week of the year
26 - 26th week of the year
Etc.
111111001122669999- 11225566
SSeeqquueenncceeNNuummbbeerr
YYeeaarrooffMMaannuuffaaccttuurree
98 - 1998
99 - 1999
Etc
CAUTION
Do not use this appliance if any part has been under water.Immediately call a qualified service technician to inspect the appliance
and replace any gas control, which has been under water.

1166

1177

1188

1199
WWAARRRRAANNTTYY
WWaarrrraannttyy
Seller warrants its products to be free from defects in material
and workmanship, EXCLUSIVE, HOWEVER, of failures
attributable to the use of materials substituted under
emergency conditions for materials normally employed. This
warranty covers replacement of any parts furnished from the
factory of Seller, but does not cover labor of any kind and
materials not furnished by Seller, or any charges for any such
labor or materials, whether such labor, materials or charges
thereon are due to replacement of parts, adjustments, repairs,
or any other work done.This warranty does not apply to any
equipment which shall have been repaired or altered outside
the factory of Seller in any way so as, in the judgment of Seller,
to affect its stability, nor which has been subjected to misuse,
negligence, or operating conditions in excess of those for which
such equipment was designed.This warranty does not cover
the effects of physical or chemical properties of water or steam
or other liquids or gases used in the equipment.
BUYER AGREES THAT SELLER’S WARRANTY OF ITS
PRODUCTS TO BE FREE FROM DEFECT IN MATERIAL AND
WORKMANSHIP, AS LIMITED HEREIN, SHALL BE IN LIEU
OF AND EXCLUSIVE OF ALL OTHER WARRANTIES,
EITHER EXPRESS OR IMPLIED, WHETHER ARISING FROM
LAW, COURSE OF DEALING, USAGE OF TRADE, OR
OTHERWISE, TTHHEERREEAARREENNOOOOTTHHEERRWWAARRRRAANNTTIIEESS,,
IINNCCLLUUDDIINNGGWWAARRRRAANNTTYYOOFFMMEERRCCHHAANNTTAABBIILLIITTYYOORR
FFIITTNNEESSSSFFOORRPPUURRPPOOSSEE,,WWHHIICCHHEEXXTTEENNDDBBEEYYOONNDDTTHHEE
PPRROODDUUCCTTDDEESSCCRRIIPPTTIIOONNCCOONNFFIIRRMMEEDDBBYYBBUUYYEERRAANNDD
SSEELLLLEERRAASSOOFFTTHHEEDDAATTEEOOFFFFIINNAALLAAGGRREEEEMMEENNTT..
This warranty is void if the input to the product exceeds the
rated input as indicated on the product serial plate by more
than 5% on gas-fired and oil-fired units, or if the product in the
judgment of SELLER has been installed in a corrosive
atmosphere, or subjected to corrosive fluids or gases, been
subjected to misuse, negligence, accident, excessive thermal
shock, excessive humidity, physical damage, impact, abrasion,
unauthorized alterations, or operation contrary to SELLER’S
printed instructions, or if the serial number has been altered,
defaced or removed.
HHeeaattEExxcchhaannggeerrss
For Seller’s non-separated combustion gas-fired unit heaters
and packaged rooftop units
BUYER’S REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF SELLER, ANY HEAT EXCHANGER WHICH
SHALL, WITHIN TEN YEARS FROM DATE OF FIRST
BENEFICIAL USE BY BUYER OR ANY OTHER USER,
WITHIN TEN YEARS FROM DATE OF RESALE BY BUYER
OR ANY OTHER USER, WITHIN TEN YEARS FROM DATE
OF RESALE BY BUYER IN ANY UNCHANGED
CONDITION, OR WITHIN ONE HUNDRED TWENTY-SIX
MONTHS FROM DATE OF SHIPMENT FROM SELLER,
WHICHEVER OCCURS FIRST, BE RETURNED TO
SELLER WITH TRANSPORTATION CHARGES PREPAID
AND WHICH THE EXAMINATION OF SELLER SHALL
DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT
WHEN THE PRODUCT IS TO BE USED BY BUYER AS A
COMPONENT PART OF EQUIPMENT MANUFACTURED
BY BUYER, BUYER’S REMEDY FOR BREACH, AS
LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER. FOR GAS-
FIRED PRODUCTS INSTALLED IN HIGH HUMIDITY
APPLICATIONS AND UTILIZING STAINLESS STEEL HEAT
EXCHANGERS, BUYER’S REMEDY FOR BREACH, AS
LIMITED HEREIN, SHALL BE LIMITED TO TEN YEARS
FROM DATE OF SHIPMENT FROM SELLER.
For Seller's Low Intensity Gas-Fired Infrared Heaters
BUYER'S REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF SELLER, ANY HEAT EXCHANGER WHICH
SHALL, WITHIN FIVE YEARS FROM DATE OF FIRST
BENEFICIAL USE BY BUYER OR ANY OTHER USER,
WITHIN FIVE YEARS FROM DATE OF RESALE BY
BUYER OR ANY OTHER USER, WITHIN FIVE YEARS
FROM DATE OF RESALE BY BUYER IN ANY
UNCHANGED CONDITION, OR WITHIN 66 MONTHS
FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER
OCCURS FIRST, BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH
THE EXAMINATION OF SELLER SHALL DISCLOSE TO
HAVE BEEN DEFECTIVE; EXCEPT THAT WHEN THE
PRODUCT IS TO BE USED BY BUYER AS A
COMPONENT PART OF EQUIPMENT MANUFACTURED
BY BUYER, BUYER'S REMEDY FOR BREACH, AS
LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER.
HHeeaattEExxcchhaannggeerr((CCoonnddeennsseerrss))for all Seller’s products
except non-separated combustion gas-fired unit heaters and
infrared heaters, and Burners and Sheet Metal for all
products.
BUYER’S REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF SELLER, ANY HEAT EXCHANGER
(CONDENSER) OR BURNER WHICH SHALL, WITHIN
ONE YEAR FROM DATE OF FIRST BENEFICIAL USE BY
BUYER OR ANY OTHER USER, WITHIN ONE YEAR
FROM DATE OF RESALE BY BUYER IN ANY
UNCHANGED CONDITION, OR WITHIN EIGHTEEN
MONTHS FROM DATE OF SHIPMENT FROM SELLER,
WHICHEVER OCCURS FIRST, BE RETURNED TO
SELLER WITH TRANSPORTATION CHARGES PREPAID
AND WHICH THE EXAMINATION OF SELLER SHALL
DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT THAT
WHEN THE PRODUCT IS TO BE USED BY BUYER AS A
COMPONENT PART OF EQUIPMENT MANUFACTURED
BY BUYER, BUYER’S REMEDY FOR BREACH, AS
LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER.
BBuurrnneerrss
For all Seller's Low Intensity Gas-Fired Infrared Heaters
BUYER'S REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF SELLER, ANY BURNER WHICH SHALL,
WITHIN TWOYEARS FROM DATE OF FIRST BENEFICIAL
USE BY BUYER OR ANY OTHER USER, WITHIN TWO
YEARS FROM DATE OF RESALE BY BUYER IN ANY
UNCHANGED CONDITION, OR WITHIN 30 MONTHS
FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER
OCCURS FIRST, BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH
THE EXAMINATION OF SELLER SHALL DISCLOSE TO
HAVE BEEN DEFECTIVE; EXCEPT THAT WHEN THE
PRODUCT IS TO BE USED BY BUYER AS A
COMPONENT PART OF EQUIPMENT MANUFACTURED
BY BUYER, BUYER'S REMEDY FOR BREACH, AS
LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER.

CCoommmmeerrcciiaallHHVVAACC&&RRDDiivviissiioonn••Modine Manufacturing Company • 1500 DeKoven Avenue • Racine, Wisconsin 53403-2552
Tel: [phone] (HEAT) • Fax: [phone] • www.modine.com
© 2001 Modine Manufacturing Company 10/01 - .5M Litho in USA
WWAARRRRAANNTTYY
BBuurrnneerrss//HHeeaattEExxcchhaannggeerrss
For all Seller's High Intensity Gas-Fired Infrared Heaters
BUYER'S REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF SELLER, ANY BURNER WHICH SHALL,
WITHIN TEN YEARS FROM DATE OF FIRST BENEFICIAL
USE BY BUYER OR ANY OTHER USER, WITHIN TEN
YEARS FROM DATE OF RESALE BY BUYER IN ANY
UNCHANGED CONDITION, OR WITHIN 126 MONTHS
FROM DATE OF SHIPMENT FROM SELLER, WHICHEVER
OCCURS FIRST, BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH
THE EXAMINATION OF SELLER SHALL DISCLOSE TO
HAVE BEEN DEFECTIVE; EXCEPT THAT WHEN THE
PRODUCT IS TO BE USED BY BUYER AS A
COMPONENT PART OF EQUIPMENT MANUFACTURED
BY BUYER, BUYER'S REMEDY FOR BREACH, AS
LIMITED HEREIN, SHALL BE LIMITED TO ONE YEAR
FROM DATE OF SHIPMENT FROM SELLER.
PPaacckkaaggeeddRRooooffttooppUUnniitt
BUYERS REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF THE SELLER ANY PART OR PARTS WHICH
SHALL BE RETURNED TO SELLER WITH
TRANSPORTATION CHARGES PREPAID AND WHICH
THE EXAMINATION OF THE SELLER SHALL DISCLOSE
TO HAVE BEEN DEFECTIVE AS FOLLOWS.
CCOOMMPPRREESSSSOORR- WITHIN FIVE YEARS FROM DATE OF
FIRST BENEFICIAL USE BY THE BUYER OR ANY
OTHER USER, WITHIN FIVEYEARS FROM DATE OF
RESALE BY BUYER IN ANY UNCHANGED CONDITION,
OR WITHIN SIXTY MONTHS FROM DATE OF SHIPMENT
FROM SELLER, WHICHEVER OCCURS FIRST.
CCOOIILLSS- WITHIN THREE YEARS FROM DATE OF FIRST
BENEFICIAL USE BY THE BUYER OR ANY OTHER
USER, WITHIN THREE YEARS FROM DATE OF RESALE
BY BUYER IN ANY UNCHANGED CONDITION, OR
WITHIN THIRTY-SIX MONTHS FROM DATE OF
SHIPMENT FROM SELLER, WHICHEVER OCCURS
FIRST.
AAllllOOtthheerrCCoommppoonneennttssEExxcclluuddiinnggHHeeaattEExxcchhaannggeerr
((CCoonnddeennsseerr)),,BBuurrnneerr,,aannddSShheeeettMMeettaall
All Seller Heating Products except St. Paul Produced
products, Packaged Rooftop Units, and High Intensity
Gas-Fired Infrared Heaters
BUYER’S REMEDY FOR BREACH OF WARRANTY,
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW, IS LIMITED TO REPAIR OR REPLACEMENT AT THE
FACTORY OF SELLER, ANY PART OR PARTS WHICH
SHALL, WITHIN TWOYEARS FROM DATE OF FIRST
BENEFICIAL USE BY BUYER OR ANY OTHER USER,
WITHIN TWOYEARS FROM DATE OF RESALE BY
BUYER IN ANY UNCHANGED CONDITION, OR WITHIN
THIRTY MONTHS FROM DATE OF SHIPMENT FROM
SELLER, WHICHEVER OCCURS FIRST, BE RETURNED
TO SELLER WITH TRANSPORTATION CHARGES
PREPAID AND WHICH THE EXAMINATION OF SELLER
SHALL DISCLOSE TO HAVE BEEN DEFECTIVE; EXCEPT
THAT WHEN THE PRODUCT IS TO BE USED BY BUYER
AS A COMPONENT PART OF EQUIPMENT
MANUFACTURED BY BUYER, BUYER’S REMEDY FOR
BREACH, AS LIMITED HEREIN, SHALL BE LIMITED TO
ONE YEAR FROM DATE OF SHIPMENT FROM SELLER.
St. Paul Produced Products, Packaged Rooftop Units, and
High Intensity Gas-Fired Infrared Heaters
BUYER’S REMEDY FOR BREACH OF WARRANTY
EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY
LAW IS LIMITED TO REPAIR OR REPLACEMENT AT THE
SELLER’S OPTION ANY PART OR PARTS WHICH SHALL
WITHIN A PERIOD OF ONE YEAR FROM DATE OF FIRST
BENEFICIAL USE BY BUYER OR ANY OTHER USER,
WITHIN ONE YEAR FROM DATE OF RESALE BY BUYER
IN ANY UNCHANGED CONDITION, OR WITHIN 18
MONTHS FROM DATE OF SHIPMENT FROM SELLER,
WHICHEVER OCCURS FIRST, BE RETURNED TO
SELLER WITH TRANSPORTATION CHARGES PREPAID
AND WHICH THE EXAMINATION OF THE SELLER SHALL
DISCLOSE TO HAVE BEEN DEFECTIVE.
BUYER AGREES THAT IN NO EVENT WILL SELLER BE
LIABLE FOR COSTS OF PROCESSING, LOST PROFITS,
INJURY TO GOODWILL, OR ANY OTHER CONSEQUENTIAL
OR INCIDENTAL DAMAGES OF ANY KIND RESULTING
FROM THE ORDER OR USE OF ITS PRODUCT, WHETHER
ARISING FROM BREACH OF WARRANTY,
NONCONFORMITY TO ORDERED SPECIFICATIONS, DELAY
IN DELIVERY, OR ANY LOSS SUSTAINED BY THE BUYER.
CCaanncceellllaattiioonn––IInnssppeeccttiioonn––RReejjeeccttiioonn
Orders for material or equipment are not cancelable, either in
whole or part, nor is material returnable for credit.
Seller will replace any material or equipment not conforming to
the product description as agreed upon by Buyer and Seller as
of the data of shipment only if the Buyer notifies Seller, at the
address on the Seller’s INVOICE, of the particular details of
non-conformance or defect of such material of equipment, by
written or electronic notice, either before or immediately upon
delivery, and only if such non-conforming material or equipment
is returned, sold, or otherwise disposed of in accordance with
instructions of Seller. Buyer agrees to inspect all of the ordered
material or equipment either before or upon delivery and
waives all his rights to reject or refuse to accept any non-
conforming material or equipment unless notice is given to
Seller in the aforesaid time and manner. Buyer may inspect the
ordered material at Seller’s plant in an area designated by
Seller. Buyer agrees that the right of rejection of non-
conforming material or equipment, as limited herein, and the
right to replacement by Seller with material or equipment, as
limited herein, and the right to replacement be Seller with
material or equipment conforming to the ordered specifications,
are exclusive of all other remedies provided by law. Written
authorization must be issued by Seller before any material is
returned to its plant.
GGoovveerrnniinnggLLaaww
It is agreed that the parties hereto intend that all questions as
to validity, interpretation, and required performance arising out
of this contract are to be governed by the laws of the State of
Wisconsin (Uniform Commercial Code).