Desa SBLP375AT, 375-F User Manual

PROPANE/LP CONSTRUCTION FORCED AIR HEATER

OWNER’S MANUAL

MODELS BLP375AT, SBLP375AT AND 375-F

225,000 - 375,000 Btu/Hr With Built-In Thermostat AT Series

IMPORTANT: Read and understand this manual before
assembling, starting or servicing heater. Improper use
of heater can cause serious injury. Keep this manual for
future reference.

GENERAL HAZARD WARNING: Failure to comply
with the precautions and instructions provided with this
heater, can result in death, serious bodily injury and
property loss or damage from hazards of fire, explosion,
burn, asphyxiation, carbon monoxide poisoning and/or
electrical shock.

Only persons who can understand and follow the in­structions should use or service this heater.

If you need assistance or heater information such as an in­structions manual, labels, etc. Contact the manufacturer.

Save this manual for future reference.

For more information, visit www.desatech.com

Safety Information ............................................... 2

TABLE OF CONTENTS

Product Identification ...........................................

Unpacking ........................................................... 3

Theory of Operation ............................................ 4

Propane Supply ................................................... 4

Ventilation ............................................................ 4

Installation ........................................................... 5

Operation ............................................................. 5

Storage ................................................................ 6

Maintenance ........................................................ 6

Service Procedures ............................................. 7

3

Service Publications ............................................ 8

Specifications ......................................................

Accessories ......................................................... 8

Technical Service ................................................

Wiring Diagrams .................................................. 9

Replacement Parts .............................................. 9

Illustrated Parts Breakdown and Parts List ....... 10

Warranty and Repair Service ............................

8

8

12

SAFETY INFORMATION

WARNING: This product
contains and/or generates
chemicals known to the State
of California to cause cancer or
birth defects or other reproduc­tive harm.

WARNING: Fire, burn, in­halation and explosion hazard.
Keep solid combustibles, such
as building materials, paper or
cardboard, a safe distance away
from the heater as recommended
by the instructions. Never use
the heater in spaces which do or
may contain volatile or airborne
combustibles or products such
as gasoline, solvents, paint thin­ner, dust particles or unknown
chemicals.

WARNING: Not for home or
recreational vehicle use.

The heater is designed and approved for use as
a construction heater under ANSI Z83.7•CGA

2.14-2000 Construction Heater. The purpose
of construction heaters is to provide temporary
heating of buildings under construction, alteration
or repair. Properly used, the heater provides safe
economical heating. Products of combustion are
vented into the area being heated.

We cannot foresee every use which may be made of
our heaters. Check with your local fire safety au

thority if you have questions about heater use.

Other standards govern the use of fuel gases and
heat producing products for specific uses. Your
local authorities can advise you about these.

Carbon Monoxide Poisoning: Some people are

more affected by carbon monoxide than others.
Early signs of carbon monoxide poisoning re­semble the flu, with headaches, dizziness and/or
nausea. If you have these signs, the heater may
not be working properly. Get fresh air at once!
Have heater serviced.

Propane/LP Gas: Propane/LP gas is odorless. An

odor-making agent is added to propane/LP gas.
The odor helps you detect a propane/LP gas leak.
However, the odor added to propane/LP gas can
fade. Propane/LP gas may be present even though
no odor exists.

Make certain you read and understand all warn
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.

1. Install and use heater with care. Follow all
local ordinances and codes. In the absence
of local ordinances and codes, refer to the

Standard for Storage and Handling of Liq
uefied Petroleum Gas, ANSI/NFPA 58 and
the Propane Installation Code, CAN/CGA
B149.2. This instructs on the safe storage and

handling of propane gases.

2. Use only the electrical voltage and frequency
specified on model plate. The electrical con
nections and grounding of the heater shall fol
low the National Electric Code, ANSI/NFPA
70 or the Canadian Electric Code, Part 1.

3. Electrical grounding instructions - This appli
ance is equipped with a three-prong (ground
ing) plug for your protection against shock
hazard and should be plugged directly into a
properly grounded three-prong receptacle or
extension cord.

4. This product has been approved for use in the
Commonwealth of Massachusetts.

5.

For indoor use only. Provide adequate ven­tilation.

-

6. Keep heater away from strong drafts, wind,
water spray, rain or dripping water.

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116699-01B

SAFETY INFORMATION

Continued

7. Use only in well-vented areas. Before using
heater, provide at least a three-square-foot
opening of fresh, outside air for each 100,000
Btu/Hr (105,500 k/j) of rating.

8. Do not use heater outdoors or in occupied
dwellings.

9.

Do not use heater in living or sleeping quarters.

10. Keep appliance area clear and free from com­bustible materials, gasoline, paint thinner and
other flammable vapors and liquids. Dust is
combustible. Do not use heater in areas with
high dust content.

11. This heater is equipped with a thermostat.
Heater may start at anytime.

12. Check heater for damage before each use. Do
not use a damaged heater.

13. Use only propane/LP gas set up for vapor
withdrawal.

14. Keep propane tank(s) below 100° F (38° C).

15. Do not use heater in a basement or below
ground level. Propane/LP gas is heavier than
air. If a leak occurs, propane/LP gas will sink
to the lowest possible level.

16. Use only the hose and factory regulator pro
vided with the heater.

17. Check hose before each use of heater. If highly
worn or cut, replace with hose specified by
manufacturer before using heater.

18. Do not alter heater. Keep heater in its original
state.

19. Do not use heater if altered.

20. Keep heater at least 6 feet (1.8 m) from
propane/LP tank(s). Do not point heater at
propane/LP tank(s) within 20 feet (6.1 m).

21.

Minimum heater clearances from combus­tibles: Outlet: 8 Ft. (2.4 m), Sides: 2 Ft. (0.6 m),
Top: 6 Ft. (1.8 m), Rear: 2 Ft. (0.6 m)

22. Locate heater on stable and level surface if
heater is hot or running.

23. Keep children and animals away from
heater.

24. Turn off propane/LP supply and unplug heater
when not in use.

25. Never block air inlet (rear) or air outlet (front)
of heater.

26. Never move, handle or service a hot, operating
or plugged-in heater.

27. Never attach duct work to front or rear of
heater.

28. Use only original replacement parts. This
heater must use design-specific parts. Do
not substitute or use generic parts. Improper
replacement parts could cause serious or fatal
injuries.

29. Do not adjust regulator below 7 psig or above
20 psig.

PRODUCT

IDENTIFICATION

Hot Air Outlet
(Front)

Handle

Outer
Shell

On/Off
Switch

-

Inlet Connector

REAR VIEW

Figure 1 - 375,000 Btu/Hr Models

Power Cord

Hose/Regulator
Assembly

Thermostat Knob

UNPACKING

1. Remove all packing items applied to heater for
shipment. Keep plastic cover cap (attached to
inlet connector and hose/regulator assembly)
for storage.

2. Remove all items from carton.

3. Check all items for shipping damage. If heater
is damaged, promptly inform dealer where you
bought heater.

Fan
Guard

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3

THEORY OF OPERATION

Air For Combustion

Air For Heating

The Fuel System: The hose/regulator assembly attaches to the propane gas supply. The propane gas

moves through the solenoid valve and out the nozzle.

The Air System: The motor turns the fan. The fan pushes air into and around the combustion chamber.

This air is heated and provides a stream of clean, hot air.

The Ignition System: The direct spark ignitor (DSI) sends voltage to the ignitor. The ignitor ignites

the fuel and air mixture.

The Safety Control System: This system causes the heater to shut down if the flame goes out. The

motor will continue to run, but no heat is produced.

Combustion Chamber

Clean
Heated
Air Out
(Front)

Ignitor

Fan

Motor

Cool
Air In
(Back)

DSI

Air For Combustion
Air For Heating

Figure 2 - Cross Section Operational View

Nozzle

PROPANE SUPPLY

Propane/LP gas and propane/LP tank(s) are to be
furnished by the user.

Use this heater only with a propane/LP vapor
withdrawal supply system. See Chapter 5 of the

Standard for Storage and Handling of Liquefied
Petroleum Gas, ANSI/NFPA 58 and the Propane
Installation Code CAN/CGA B149.2. Your lo

cal library or fire department will have these
booklets.

The amount of propane/LP gas ready for use from
propane/LP tanks varies. Two factors decide this
amount:

1. The amount of propane/LP gas in the tank(s)

2. The temperature of tank(s)
The chart below shows the number of 100-pound

tanks needed to run this heater.
Do not operate this product with any tank smaller

than 100 pounds.

Temperature Number
at tank location of tanks

40° F (5° C) and above 2
Below 40° F (5° C) (Use larger tank)

Power Cord

Solenoid Valve

Less gas is vaporized at lower temperatures. You
may need a larger tank in colder weather. Your
local propane/LP gas dealer will help you select
the proper supply system. The minimum sur
rounding air temperature rating for each heater
is -20°F (-7° C).

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VENTILATION

Hose/
Regulator
Assembly

WARNING: Follow the mini­mum fresh, outside air ventila
tion requirements. If proper
fresh, outside air ventilation is
not provided, carbon monoxide
poisoning can occur. Provide
proper fresh, outside air ventila­tion before running heater.

Provide a fresh air opening of at least three square
feet for each 100,000 Btu/Hr (105,500 k/j) rating.
This heater requires a fresh air opening of at least

11.25 square feet (1.05 m
if more heaters are being used.

2

). Provide extra fresh air

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4

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116699-01B

INSTALLATION

WARNING: Review and un­derstand the warnings in the
Safety Information section, page

2. They are needed to safely op­erate this heater. Follow all local
codes when using this heater.

WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Never use
an open flame to check for a leak.
Apply a mixture of liquid soap
and water to all joints. Bubbles
forming show a leak. Correct all
leaks at once.

1. Provide propane/LP supply system (see Pro-

pane/LP Supply,

2. Connect POL fitting on hose/regulator assem
bly to propane/LP tank(s). Turn POL fitting
counterclockwise into threads on tank. Tighten
firmly using a wrench. IMPORTANT: Tighten
regulator with black adjustment knob point
ing down. Pointing adjustment knob down
protects regulator from weather damage.

3. Connect hose to inlet connector. Tighten firmly
using a wrench.

IMPORTANT: Extra hose or piping may

be used if needed. Install extra hose or pip
ing between hose/regulator assembly and
propane/LP tank. You must use the regulator
supplied with the heater.

4. Open propane/LP supply valve on propane/LP
tank(s) slowly. Note: If not opened slowly, ex
cess-flow check valve on propane/LP tank will
stop gas flow. If this happens, you may hear a
click inside the regulator assembly. To reset
the excess flow check valve, close propane/LP
supply valve and open again slowly.

Supply
Valve

Propane/LP
Tank

Figure 3 - Regulator With Adjustment

116699-01B

page 4).

POL Fitting

Hose

Regulator

Adjustment Knob
(pointing down)

Knob Pointing Down

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5. Adjust regulator between 7 and 20 psig. Note:
Higher regulator setting will allow heater to
produce more heat.

6. Check all connections for leaks.

7. Close propane/LP supply valve.

WARNING: Do not adjust
regulator below 7 psig or above
20 psig. Heater may not run
properly.

Hose

Inlet Connector

Figure 4 - Hose and Inlet Connector

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OPERATION

-

-

-

WARNING: Review and un­derstand the warnings in the
Safety Information section, page

2. They are needed to safely op­erate this heater. Follow all local
codes when using this heater.

TO START HEATER

1. Follow all installation, ventilation and safety
information.

2. Locate heater on stable and level surface.
Make sure strong drafts do not blow into front
or rear of heater.

3. Plug power cord of heater into a three-prong,
grounded extension cord. Extension cord must
be at least six feet long. Extension cord must
be UL listed.

Extension Cord Size Requirement

Up to 50 feet (15 m) long, use 18 AWG
rated cord.

51 to 100 feet (15.5 to 30.5 m) long, use 16

AWG rated cord.

101 to 200 feet (30.78 to 61 m) long, use 14

AWG rated cord.

4. Plug extension cord into a 120 volt/60 hertz,
three-hole, grounded outlet.

5

OPERATION

Continued

5. Open propane/LP supply valve on propane/LP
tank(s) slowly. Note: If not opened slowly, ex-
cess-flow check valve on propane/LP tank will
stop gas flow. If this happens, you may hear a
click inside the regulator assembly. To reset
the excess flow check valve, close propane/LP
supply valve and open again slowly.

6. Make sure regulator is set between 7 and 20
psig. Note: Higher regulator setting will allow
heater to produce more heat.

7. Turn on/off switch to the ON position. Adjust
thermostat to desired setting. If heater does
not start, thermostat setting may be too low.
Turn thermostat knob to higher position to start
heater. Note: If heater does not start, turn on/off
switch to the OFF position. Wait ten seconds
for safety control to reset, then try again.

TO STOP HEATER

1. Tightly close propane/LP supply valve on
propane tank(s).

2. Wait a few seconds. Heater will burn gas left
in supply hoses.

3. Turn on/off switch to the OFF position.

4. Unplug heater.

TO RESTART HEATER

If safety control stops gas flow to heater, motor
will continue to run.

1. Turn on/off switch to the OFF position.

2. Wait ten seconds, then turn on/off switch to
the ON position.

If heater does not restart

1. Check manual valves (if any) and supply
valves (on propane/LP tank). Make sure they
are open.

2. Check fuel level in propane/LP tank(s). If fuel
level is too low, contact local propane/LP gas
company.

If heater still does not restart, contact your local
service center.

STORAGE

CAUTION: Disconnect heater

from propane supply tank(s).

1. Store propane/LP tank(s) in safe manner.
See chapter 5 of Standard for Storage and

Handling of Liquefied Petroleum Gases, ANSI/
NFPA 58 and the Propane Installation Code
CAN/CGA B149.2

2. Place plastic cover caps over brass fittings on
inlet connector and hose/regulator assembly.

3. Store in dry, clean and safe place. Do not
store hose/regulator assembly inside heater
combustion chamber.

4. When taking heater out of storage, always
check inside of heater. Insects and small
animals may place foreign objects in heater.
Keep inside of heater free from combustible
and foreign objects.

. Follow all local codes.

MAINTENANCE

WARNING: Never service
heater while it is plugged in,
connected to propane supply,
operating or hot. Severe burns
and electrical shock can occur.

1. Keep heater clean. Clean heater annually or
as needed to remove dust and debris. If heater
is dirty or dusty, clean heater with a damp
cloth.

2. Inspect heater before each use. Check connec
tions for leaks. Apply mixture of liquid soap
and water to connections. Bubbles forming
show a leak. Correct all leaks at once.

3. Inspect hose/regulator assembly before each
use. If hose is highly worn or cut, replace.

4. Have heater inspected yearly by a qualified
service agency.

5. Keep inside of heater free from combustible
and foreign objects.

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6

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116699-01B

SERVICE PROCEDURES

WARNING: Never service
heater while it is plugged in,
connected to propane supply,
operating or hot. Severe burns
and electrical shock can occur.

CLEANING FAN

Clean fan every 500 hours of operation or as
needed.

1. Remove screws on side cover using 5/16"
nut-driver.

2. Remove side cover.

3. Detach the five motor wires from parts under
heater shell. Be sure to detach only wires
coming from motor.

The five motor wires are:

• white wire—to terminal board

• black wire—to terminal board

• blue wire—to thermal switch wire

• orange wire—to solenoid valve

• green wire—to grounding screw on shell

4. Remove fan guard from rear of heater.

5. Reach into rear of heater shell. Carefully pull
motor wires through hole in bottom of shell.
Note: Pull wires through hole one at a time.

6. Remove nuts and mounting bolts holding
motor mount to shell. Use 3/8" nut-driver and
7/16" wrench.

7. Carefully pull motor and fan out of shell.
IMPORTANT: Be careful not to damage fan.
Do not set motor and fan down with the weight
resting on fan. This could damage fan pitch.

8. Turn motor and fan around. Place motor and
fan into shell backwards. Note: Motor will go
into shell first (see Figure 7).

9. Line up rear mounting holes in shell with
first hole on each side of motor mount (see
Figure 7). Note: When holes are lined up, fan
should be outside of shell.

10. Holding mounting bolt, carefully reach
through fan blades into rear of heater. Be
careful not to damage fan pitch. Insert bolt
through motor mount and shell. With free
hand, attach nut finger tight. Repeat process
for other mounting hole.

11. Use 1/8" hex wrench to loosen setscrew which
holds fan to motor shaft (see Figure 8).

12. Slip fan off motor shaft.

13. Clean fan using soft cloth moistened with
kerosene or solvent.

14. Dry fan thoroughly.

116699-01B

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Thermal
Switch
Wire

Figure 5 - Location of Motor Wires

Mounting
Bolts

Figure 6 - Location of Fan and Motor

Figure 7 - Fan and Motor Turned Around

Fan

Figure 8 - Fan, Motor Shaft and Setscrew

Grounding
Screw

Motor Wires

Motor
Shaft

Location

Terminal
Board

Solenoid
Valve

Motor
Mount

Rear
Mounting
Hole

First
Hole

Setscrew

7

SERVICE PROCEDURES

Continued

15. Replace fan on motor shaft. Make sure set
screw is touching back of flat surface on motor
shaft (see Figure 9).

16. Place setscrew on flat of shaft. Tighten set
screw firmly (40-50 inch-pounds).

17. Remove two nuts and bolts securing motor
mount to shell.

18. Pull motor and fan from shell. Turn motor
and fan around. Carefully place back in shell.
Note: Fan will go into shell first.

19. Line up mounting holes in shell with holes on
motor mount. Replace four bolts through shell
and motor mount. Insert bolts from outside of
heater. Tighten nuts firmly.

20. Route motor wires through hole in bottom of
shell (see Figure 6, page 7).

21. Connect motor wires as follows (see Figure
5, page 7):

• white wire—to terminal board
Note: Attach to empty connector on white

wire side of terminal board

• black wire—to terminal board
Note: Attach to empty connector on black

wire side of terminal board

• blue wire—to thermal switch wire

• orange wire—to solenoid valve

• green wire—to grounding screw on shell

22. Replace side cover.

23. Replace fan guard.

Fan

Hub

Motor
Shaft

SPECIFICATIONS

• Output Rating - 225,000 to 375,000 (Btu/Hr)

• Fuel - Propane/LP Vapor Only

-

• Fuel Consumption
Gallons(liters)/Hour - 2.5 (9,4) Min/4.0 (15) Max
Pounds(kg)/Hour - 10.4 (4.7) Min/17.4 (7.9) Max

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• Supply Pressure To Regulator

Minimum* - 25 psig (172 kPa)
Maximum - Tank Pressure

• Regulator Outlet Pressure -

7-20 psig (48 to 138 kPa)

• Hot Air Output - 1500 CFM (

• Motor - 1725 RPM, 1/5 HP

• Electric Input - 120 V/60 Hz

• Amperage - 4.2

• Ignition - Electronic Direct Spark, D.S.I.

* (for purposes of input adjustment)

pi³/min)

ACCESSORIES

Purchase accessories and parts from your nearest
dealer or service center. If your dealer or service
center can not supply an accessory or part, either
contact your nearest Parts Central (listed in the
separate Authorized Service Center booklet) or
call DESA Heating Products at 1-866-672-6040
for referral information. You can also write to the
address listed on the back page of this manual.

Fuel Gas Connector: LPA4020

A POL adapter with excess-flow check valve.

Thermostat: HA1210

TECHNICAL SERVICE

You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Productsʼ Technical Service Department
at 1-866-672-6040. When calling please have your
model and serial numbers of your heater ready.

You can also visit DESA Heating Productsʼ techni
cal services web site at www.desatech.com.

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Setscrew

Figure 9 - Fan Cross Section

SERVICE PUBLICATIONS

You can receive an Illustrated Parts List free of
charge. Send your request and a self-addressed,
stamped envelope to DESA Heating Products
(address on back page). Be sure to include the
heater model number. You can purchase a service
manual for $5. Make check payable to DESA
Heating Products.

8

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116699-01B

WIRING DIAGRAMS

Green

Green

Solenoid

Va

lve

Motor

On/Off

Switc

h

Green

Power

Cord

T

Blue

Blue

Black

White

DSI

Control

Orange

Ignitor

Thermal
Switch

Orange

Terminal

Board

White White

Black Black

Blue

Connector

Blue

Connector

Connector

Blue

Black

T

Green

Black

White

Thermal Switch

Blue

Motor

Line

Ground

Neutral

White

White

Orange

Orange

Green

Black

Connector

Blue

Blue

Ignitor

Solenoid

Va

lve

Direct Spark

Ignitor

Centrifugal

Switch

Green

Green

Black

T

T

Figure 10 - Wiring Diagram

Figure 11 - Electrical Ladder Diagram

REPLACEMENT PARTS

WARNING: Use only original
replacement parts. This heater must
use design-specific parts. Do not
substitute or use generic parts. Im
proper replacement parts could cause
serious or fatal injuries. This will also
protect your warranty coverage for
parts replaced under warranty.

PARTS UNDER WARRANTY

Contact authorized dealers of this product. If they
canʼt supply original replacement part(s), either
contact your nearest Parts Central or call DESA
Heating Productsʼ Technical Service Department

116699-01B

www.desatech.com

at 1-866-672-6040. When calling DESA Heating
Products, have ready:

• your name

• your address

• model and serial numbers of your heater

• how heater was malfunctioning

-

• purchase date
In most cases, we will ask you to return the part
to the factory.

PARTS NOT UNDER WARRANTY

Contact authorized dealers of this product. If they
canʼt supply original replacement part(s), either con­tact your nearest Parts Central or call DESA Heating
Products at 1-866-672-6040 for referral information.
When calling DESA Heating Products, have ready:

• model number of your heater

• the replacement part number

9

ILLUSTRATED PARTS BREAKDOWN

Note: Screws are standard hardware items

2

21

1

4

27

18

3

8

9

10

11

22

17

23

29

16

15

20

7

14

12

13

6

5

19

32

30

26

31

25

34

33

24

MODELS BLP375AT, SBLP375AT AND 375-F

10

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116699-01B

PARTS LIST

MODELS BLP375AT, SBLP375AT AND 375-F

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 9 of this manual.

KEY
NO. PART NO. DESCRIPTION QTY.

1 097844-02 Outer Shell Assembly (BLP375AT) 1

097844-04 Outer Shell Assembly (SBLP375AT) 1

097844-05 Outer Shell Assembly (375-F) 1
2 ** Combustion Chamber Assembly 1
3 ** Burner Assembly 1
4 097805-01 Ignitor 1
5 097918-01 Cleat 2
6 097917-01 Handle 1
7 097806-02 Ignitor Cable 1
8 097811-01 Fan 1
9 097802-01 Motor 1
10 M50104-02 Shorty Bushing 1

097838-02 Fan Guard 1

11
12 M11143-1 Strain Relief Bushing 1
13 098219-17 Cord Assembly 1
14 097809-01 Male Fitting 1
15 097828-01 Solenoid Bracket 1

16 098201-01 Solenoid Valve 1
17 100145-01 Fuel Tube 1
18 099679-01 Nozzle 1
19 097833-04 Side Cover 1
20 097833-03 Side Cover 1
21 101732-03 Thermal Switch Kit 1
22 097829-02 Motor Mount 1
23 098226-01 On/Off Switch 1
24 * Indicator Plate 1
25 099125-01 Terminal Board 1
26 100408-03 Base 1
27 097848-01 Rear Plate Assembly 1
28 100146-01 Elbow Fitting 1
29 098827-01 Compression Fitting 1
30 M10908-1 Screw, Hex TPG “F” 6-32x.25 2
31 097657-03 Thermostat 1
32 104905-01 Thermostat Knob 1
33 110267-01 DSI Wire Harness (2003-45 Only) 1
34 110287-01 DSI Control No. 2003-45 1

M9900-170 Wire Assembly (2003-45 Only) 1

079010-36 Wire Assembly (2003-45 Only) 1

102971-02 Wiring Decal (2003-45 Only) 1

102971-01 Wiring Decal (2003-19 Only) 1

103021-03 Thermostat Decal 1

103017-05 General Information Decal 1

097650-01 Tradename Decal (Master) 2

113858-05 Tradename Decal (Universal)

111632-15

099504-08 Warning Decal 1

100865-09 Operation Decal 1

LPA2020

LPA3030 Regulator & Hose Assembly

097916-01 Baffle 1

* No Longer Available ** Not a field replacement part.

116699-01B 11

PARTS AVAILABLE - NOT SHOWN

2

Model Data Decal 1

Regulator 1

1

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