L.B. White Bloom 400, HH400 Owner's Manual And Instructions

Attention

This heater has been designed,
developed, and tested by L.B.

White Co. as a direct red heater
used specically for the heating
of greenhouses. The heater has
been approved for use in Canada

according to the Gas Fired Brooder
Standard, CAN1-2-20-M85.

CHECK WITH YOUR LOCAL FIRE
SAFETY AUTHORITY, YOUR
LOCAL FUEL GAS SUPPLIER, OR
THE L.B. WHITE COMPANY IF
YOU HAVE QUESTIONS
REGARDING APPLICATIONS.

www.lbwhite.com

SCAN THIS

with your smartphone or
visit http://goo.gl/nvneR
to view maintenance

videos for L.B.White heaters.*

WORLD PROVIDER - INNOVATIVE CLIMATE SOLUTIONS

411 Mason Street, Onalaska, WI, U.S.A 54650 • 800-345-7200 • 608-783-5691 • 608-783-6115 (fax) • www.lbwhite.com

Congratulations!

You have purchased the nest high air ow, direct red forced

air greenhouse heater available. Your new L.B. White heater

incorporates the benets from the most experienced manufac­turer of heating products using state of the art technology.

We, at L.B. White, thank you for your condence in our products

and welcome any suggestions or comments you may have...

call us, toll-free, at [phone].

Bloom™ 400

Greenhouse Heater
with Vent Mode

Model
HH400

Btu/h/kW
400,000 / 117.2

Fuel

Propane Vapor
Withdrawal or
Natural Gas

Owner’s Manual and Instructions

View this manual online at www.lbwhite.com

* Requires an app like QR Droid

for Android or for iPhone

SEE ALL

INSTRUCTIONS

INSIDE

Please refer to important

elevation information on

inside cover.

North

American

Made

Bloom 400 Greenhouse Heater

www.lbwhite.com

Owner’s Manual • Bloom 400

2

TABLE OF CONTENTS

Heater Specications ....................................................................................................4

General Information ......................................................................................................5

Safety Precautions .......................................................................................................6

Installation Instructions ................................................................................................. 9

-- General ...........................................................................................................9

-- Indoor Ventilation / Air Exchange Requirements ............................................. 9

-- Sediment Trap Installation ............................................................................. 11

-- Hanging the Heater ....................................................................................... 12

-- Propane Gas Supply Sizing .......................................................................... 13

-- Regulator .......................................................................................................13

-- Gas Hose ...................................................................................................... 13

-- Connecting the Electrical Supply...................................................................14

Start-Up ...................................................................................................................... 15

Shut-Down ..................................................................................................................15

Cleaning Instructions .................................................................................................. 15

Maintenance Instructions ............................................................................................ 16

Service Instructions .................................................................................................... 16

General ............................................................................................................. 17

Control Box Components..................................................................................18

A. Ignition Control ................................................................................... 18

B. Differential Air Pressure Switch ..........................................................19

C. Relays ................................................................................................ 19

D. Red Status Light .................................................................................20

Motor and Fan .................................................................................................. 20

Burner Orice and Igniter..................................................................................20

Ignition Cable ....................................................................................................21

Gas Control Valve .............................................................................................21

Checking Gas Pressures .................................................................................. 21

Troubleshooting Information ....................................................................................... 22

Electrical Connection and Ladder Diagram ................................................................ 28

Parts Identication

Parts Schematic................................................................................................30

Parts list ............................................................................................................ 31

Warranty Policy...........................................................................................................32

Replacement Parts and Service ................................................................................. 32

WARNING

Standard products are manufactured to operate at optimum efciency at elevations
between 0 and 2000 ft. (0-610 m) above sea level.

If operated at higher elevations the product will not function correctly and may
function in an unsafe nature. Products providing proper operation for alternate

elevations may be available.

If you require a high elevation product, did not specify when ordering, and/or the
box this unit came in does not have an alternate altitude designation sticker please

contact technical support.

WARNING

Improper installation,

adjustment, alteration,

service or maintenance

can cause injury or death.

Read the installation,

operating and mainte-

nance instructions before

installing or servicing this

equipment.

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

3

WARNING

FIRE, BURN, INHALATION, AND

EXPLOSION HAZARD

■ KEEP SOLID COMBUSTIBLES A SAFE
DISTANCE AWAY FROM THE HEATER.

■ SOLID COMBUSTIBLES INCLUDE WOOD,

PAPER, OR PLASTIC PRODUCTS, BUILDING
MATERIALS, AND DUST.

■ DO NOT USE THE HEATER IN SPACES WHICH

CONTAIN OR MAY CONTAIN VOLATILE OR
AIRBORNE COMBUSTIBLES.

■ VOLATILE OR AIRBORNE COMBUSTIBLES

INCLUDE GASOLINE, SOLVENTS, PAINT
THINNER, DUST PARTICLES OR UNKNOWN
CHEMICALS.

■ FAILURE TO FOLLOW THESE INSTRUCTIONS

MAY RESULT IN A FIRE OR EXPLOSION.

■ FIRE OR EXPLOSIONS CAN LEAD TO

PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.

FOR YOUR SAFETY

If you smell gas:

1. Open windows.

2. Don’t touch electrical switches.

3. Extinguish any open ame.

4. Immediately call your gas supplier.

FOR YOUR SAFETY

Do not store or use gasoline or other am­mable vapors and liquids in the vicinity of this

or any other appliance.

GENERAL HAZARD WARNING

■ FAILURE TO COMPLY WITH THE PRECAUTIONS AND INSTRUCTIONS PROVIDED WITH
THIS HEATER CAN RESULT IN:

— DEATH
— SERIOUS BODILY INJURY OR BURNS
— PROPERTY DAMAGE OR LOSS FROM FIRE OR EXPLOSION
— ASPHYXIATION DUE TO LACK OF ADEQUATE AIR SUPPLY OR CARBON MONOXIDE

POISONING

— ELECTRICAL SHOCK

■ READ THIS OWNER’S MANUAL BEFORE INSTALLING OR USING THIS PRODUCT.

■ ONLY PERSONS WHO CAN READ, UNDERSTAND, AND FOLLOW THE INSTRUCTIONS

SHOULD USE OR SERVICE THIS HEATER.

■ SAVE THIS OWNER’S MANUAL FOR FUTURE USE AND REFERENCE.

■ OWNER’S MANUALS AND REPLACEMENT LABELS ARE AVAILABLE AT NO CHARGE. SEE

WEBSITE, OR FOR ASSISTANCE, CONTACT L.B. WHITE AT 1-800-345-7200.

WARNING

■ PROPER GAS SUPPLY PRESSURE MUST BE PROVIDED TO THE INLET OF THE HEATER.

■ REFER TO DATA PLATE FOR PROPER GAS SUPPLY PRESSURE.

■ GAS PRESSURE IN EXCESS OF THE MAXIMUM INLET PRESSURE SPECIFIED AT THE

HEATER INLET CAN CAUSE FIRES OR EXPLOSIONS.

■ FIRES OR EXPLOSIONS CAN LEAD TO PLANT LOSS, SERIOUS INJURY, DEATH, OR
BUILDING DAMAGE.

■ GAS PRESSURE BELOW THE MINIMUM INLET PRESSURE SPECIFIED AT THE HEATER
INLET MAY CAUSE IMPROPER COMBUSTION.

■ IMPROPER COMBUSTION CAN LEAD TO ASPHYXIATION OR CARBON MONOXIDE
POISONING AND THEREFORE SERIOUS INJURY OR DEATH.

WARNING

FIRE AND EXPLOSION HAZARD

■ NOT FOR HOME OR RECREATIONAL VEHICLE USE.

■ INSTALLATION OF THIS HEATER IN A HOME OR RECREATIONAL VEHICLE MAY RESULT IN A

FIRE OR EXPLOSION.

■ FIRE OR EXPLOSIONS CAN CAUSE PROPERTY DAMAGE OR LOSS OF LIFE.

WARNING

Cancer and reproductive harm.

See www.P65Warnings.ca.gov

Bloom 400 Greenhouse Heater

www.lbwhite.com

Owner’s Manual • Bloom 400

4

Specifications

HH400

Propane Gas Natural Gas

Maximum Input (Btuh/kW) 400,000 / 117.23

Inlet Gas Supply Pressure Acceptable

at the Heater Inlet for Input Adjustment
(In. W.C. / kPa)

Max 13.5 / 3.4

Min 11.0 / 2.7 7.0 / 1.7

Indoor Mounting Air Exchange
Requirements

Exhaust Fan
(cfm/m3/hour)

1,000 / 1,699

Shuttered Air Inlet

(sq. in./sq.cm)

400 / 2581

Burner Manifold Pressure (In. W.C. / kPa) 10.0 / 2.5 6.0 / 1.5

Air Flow (cfm/m3/h) 2,500 / 4,248

Heated Air Throw (ft. / meters) 130 / 39.6

Blower Outlet Temperature (Rise over ambient -°F / °C) 130 / 54.4

Fuel Consumption Per Hour 18.5 lbs./8.38 kg 400 ft.3/11.42 m

3

4.4 gal./ 16.7 L --

Motor Characteristics (H.P. / watts) 1/2 / 373

Electrical Supply (Volts/Hz/Phase) 240 / 60 / 1

Amp Draw Starting 27.2

Continuous Operation 5.4

Dimensions See Fig. 1

Minimum Safe Distances From

Nearest Combustible Materials

(feet/meters)

TOP 4 / 1.2

SIDES 3 / .30

REAR 3 / .30

BLOWER OUTLET 10 / 3.0

GAS
SUPPLY

Propane Gas Supply - 6 ft./ 1.83

Natural Gas Supply - N/A

Minimum Operating Temperature -20 ° F / -29 ° C

FIG. 1

20 1/2 in.

(52 cm)

27 1/4 in.

(69 cm)

46 in.

(116.8 cm)

25 in.

(63.5 cm)

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

5

This Owner’s Manual includes all options and acces­sories commonly used on this heater.

When calling for technical service assistance, or for
other specic information, always have model num­ber, and serial number available. This information is

contained on the dataplate.

This manual will instruct you in the operation and

care of your unit. Have your qualied installer review
this manual with you so that you fully understand the
heater and how it functions.

The gas supply line installation, installation of the
heater, and repair and servicing of the heater requires
continuing expert training and knowledge of gas

heaters and should not be attempted by anyone who

is not so qualied.

Contact your local L.B. White distributor or the L.B.

White Company, LLC for assistance, or if you have
any questions about the use of the equipment or its

application.

The L.B. White Company, LLC has a policy of con­tinuous product improvement. It reserves the right to

change specications and design without notice.

General Information

Bloom 400 Greenhouse Heater

www.lbwhite.com

Owner’s Manual • Bloom 400

6

Propane gas and natural gas have man-made odor-

ants added specically for detection of fuel gas leaks.
If a gas leak occurs, you should be able to smell
the fuel gas. THAT’S YOUR SIGNAL TO GO INTO

IMMEDIATE ACTION!

■ Do not take any action that could ignite the fuel

gas. Do not operate any electrical switches. Do not

pull any power supply or extension cords. Do not
light matches or any other source of ame. Do not

use your telephone.

■ Get everyone out of the building and away from the

area immediately.

■ Close all propane gas tank or cylinder fuel supply
valves, or the main fuel supply valve located at the
meter if you use natural gas.

■ Propane gas is heavier than air and may settle in

low areas. When you have reason to suspect a

propane leak, keep out of all low areas.

■ Use your neighbor’s phone and call your fuel gas
supplier and your re department. Do not re-enter

the building or area.

■ Stay out of the building and away from the area
until declared safe by the reghters and your fuel

gas supplier.

■ FINALLY, let the fuel gas service person and the
reghters check for escaped gas. Have them
air out the building and area before you return.

Properly trained service people must repair the

leak, check for further leakages, and then relight
the appliance for you.

■ Some people cannot smell well. Some people

cannot smell the odor of the man-made chemi-

cal added to propane or natural gas. You must

determine if you can smell the odorant in these
fuel gases.

■ Learn to recognize the odor of propane gas and

natural gas. Local propane gas dealers will be

more than happy to give you a scratch and sniff
pamphlet. Use it to become familiar with the fuel

gas odor.

■ Smoking can decrease your ability to smell. Being
around an odor for a period of time can affect your

sensitivity to that particular odor.

■ The odorant in propane gas and natural gas is col­orless and the intensity of its odor can fade under

some circumstances.

■ If there is an underground leak, the movement of
gas through the soil can lter the odorant.

■ Propane gas odor may differ in intensity at different

levels. Since propane gas is heavier than air, there
may be more odor at lower levels.

■ Always be sensitive to the slightest gas odor. If you

continue to detect any gas odor, no matter how
small, treat it as a serious leak. Immediately go into
action as discussed previously.

Fuel Gas Odor

Safety Precautions

Odor Fading - No
Odor Detected

WARNING

Asphyxiation Hazard

■ Do not use this heater for heating human living quarters.

■ Do not use in areas without proper air exchange. See air exchange requirements on page 4 of this

manual.

■ Exhaust fans, supply air inlets, or exhaust fan outlets must not be obstructed.

■ Proper air exchange must be provided.

■ Refer to the Specication and Installation Instruction sections of this manual to determine air exchange
requirements of this heater.

■ Lack of proper air exchange will lead to improper combustion.

■ Improper combustion can lead to carbon monoxide poisoning in humans leading to serious injury or
death. Symptoms of carbon monoxide poisoning include headaches, dizziness, and difculty breathing.

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

7

■ Propane gas has a distinctive odor. Learn to
recognize these odors. (Reference Fuel Gas Odor
and Odor Fading sections above).

■ If you have not been properly trained in repair and
service of propane gas then do not attempt to light
heater, perform service or repairs, or make any
adjustments to the heater on the propane gas fuel

system.

■ Even if you are not properly trained in the service
and repair of the heater, ALWAYS be consciously
aware of the odors of propane gas and natural gas.

■ A periodic sniff test around the heater or at the

heater’s joints; i.e. hose, connections, etc., is a

good safety practice under any conditions. If you
smell even a small amount of gas, CONTACT

YOUR FUEL GAS SUPPLIER IMMEDIATELY. DO
NOT WAIT!

1. Do not attempt to install, repair, or service this

heater or the gas supply line unless you have

continuing expert training and knowledge of gas

heaters.

Qualications for service and installation of this
equipment are as follows:

a. To be a qualied gas heater service person, you

must have sufcient training and experience to
handle all aspects of gas-red heater installation,
service and repair. This includes the task of instal­lation, troubleshooting, replacement of defective
parts and testing of the heater. You must be able
to place the heater into a continuing safe and

normal operating condition. You must completely

familiarize yourself with each model heater by
reading and complying with the safety instructions,

labels, Owner’s Manual, etc., that is provided with
each heater.

b. To be a qualied gas installation person, you must

have sufcient training and experience to handle
all aspects of installing, repairing and altering gas

lines, including selecting and installing the proper

equipment, and selecting proper pipe and tank size

to be used. This must be done in accordance with
all local, state and national codes as well as the

manufacturer’s requirements.

2. All installations and applications of L.B. White

heaters must meet all relevant local, state and
national codes. Included are L.P. gas, natural gas,

electrical, and safety codes. Your local fuel gas
supplier, a local licensed electrician, the local re

department or similar government agencies, or
your insurance agent can help you determine code

requirements. In the absence of local codes, and
for installations in the U.S. and Canada, refer to the
following gas and electrical codes:

- Standard for Storage and Handling of Liqueed

Petroleum gases, NFPA58

- National Fuel Gas Code ANSI Z223.1/NFPA54

- National Electrical Code, ANSI/NFPA 70

- Natural Gas and Propane Installation Code,
CSA B149.1

- Canadian Electrical Code, CSA C22.1

3. For indoor installation only. Adequate ventilation

shall be provided.

4. We cannot anticipate every use which may be

made of our heaters. Check with the local re
safety authority if you have questions about

applications.

5. Forced air heaters shall not be directed toward any

propane gas container within 20 feet (6.10 meters).

6. Do not wash the heater. Use only compressed air,

a soft brush or dry cloth to clean the interior of the

heater and it’s components.

7. For safety, this heater is equipped with a differen-

tial air pressure switch. Never operate the heater

with any safety device that has been bypassed. Do
not operate this heater unless this feature is fully
functioning.

8. Do not block air intakes or discharge outlets of the

heater. Doing so may cause improper combus­tion or damage to heater components leading to
property damage.

9. The hose assembly shall be visually inspected on

a daily basis, after heater relocation, and when the
heater is in use. If it is evident there is excessive
abrasion or wear, or if the hose is cut, it must be

replaced prior to the heater being put into opera-

tion. The hose assembly shall be protected from
building materials, and contact with hot surfaces

during use. The replacement hose assembly shall

be that specied by the manufacturer.

10. Check for gas leaks and proper function upon

heater installation, when relocating, and after

Attention - Critical
Points to Remember!

Bloom 400 Greenhouse Heater

www.lbwhite.com

Owner’s Manual • Bloom 400

8

servicing. Refer to leak check instructions within
installation section of this manual.

11. This heater should be inspected for proper
operation by a qualied service person before

each use and at least annually.

12. Always turn off the gas supply to the heater if the

heater is not going to be used.

13. This heater is wired for 230/60/1 electrical sup­ply. There are two hot leads, a neutral lead, and
a ground lead. The heater must be connected
to a properly grounded electrical supply. Failure
to use a properly grounded electrical supply can
result in electrical shock, injury, or death.

14. If gas ow is interrupted and ame goes out, do

not relight the heater until you are sure that all
gas that may have accummulated has cleared

away. In any event, do not relight the heater for

at least 5 minutes.

15. When the heater is to be stored indoors, the

connection between the propane gas supply
container and the heater must be disconnected.
All containers must be stored in accordance

with the Standard for the Storage and Handling
of Liqueed Petroleum Gases, ANSI/NFPA 58,

or CSA B149.1, Natural Gas and Propane Gas
Installation Code.

16. Propane gas supply containers have left handed

threads. Always use the appropriate wrench
to make a connection to tighten or loosen the

P.O.L. tting at the cylinders’ gas supply valve.

17. Not for use with ductwork. DO NOT attach

any ducts to the heater’s air inlet or hot air
discharge.

18. The gas supply system must be pressure tested
prior to heater start-up. When testing, ensure the

following are adhered to:

a. The appliance and its individual shut off must be

disconnected from the gas piping system at test
pressures in excess of 1/2 PSI (3.5 kPa)

b. The appliance must be isolated from the gas

supply by closing its individual shut-off valve
during any pressure testing of the gas supply
system at test pressures equal to or less than 1/2
PSI (3.5 kPa)

19. Do not operate the heater with any panel removed.

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

9

Installation Instructions
General

Direct red heaters discharge combustion by-products

with the heated air in to the area being heated. These
include CO, CO2, NO, NO2, and Ethylene. These gases
can result in harm to the worker or the plants.

The Bloom greenhouse heater has been specically
designed and developed to meet or exceed these com-

bustion standards.

Greenhouses have a natural air leakage factor. This
natural leakage is inuenced by the design and physical
condition of the greenhouse as well as wind conditions
and other factors. This natural leakage factor cannot be
relied upon as being sufcient to provide the necessary
air exchange within the greenhouse. Proper installation
of this heater must include provision for adequate air
exchange as follows:

Indoor Ventilation / Air
Exchange Requirements

This heater requires air exchange for proper combustion
and operation. The air exchange is created by a
supply of fresh air to the heater and exhausting the air

used in the combustion process. This is accomplished
by two methods:

a. Natural Ventilation (non-mechanical):

-- The air inlet and discharge openings shall be 1 in.2
(6.5 cm2) / 1,000 Btu/h (0.29 kW) of the total input

rating of the heater.

-- The air inlet and discharge openings shall be

permanently xed in an open position to ensure
minimum ventilation required by the heater.

-- The air inlet shall be located as close as possible to

the heater. Furthest distance shall not exceed 6 ft.
(1.83 m) above, below, or to the sides of the heater.

-- The exhaust discharge location shall be located op-

posite from the heater’s discharge in an upper area
of the greenhouse or directly in line to the heater’s
discharge. DO NOT locate the exhaust discharge in

an area lower than the heater’s discharge.

b. Mechanical ventilation:

All heater installations shall have:

-- An air inlet of at least 400 in.2 / 2581 cm2.

-- An exhaust fan capable of supplying 2.5 cfm/.007 m3/
min. of air exchange per 1,000 Btu/h (0.29 kW)

Depending on size of the greenhouse, and the number
of heaters installed, the ventilation/air exchange may be

accomplished by the greenhouse’s present ventilation

system consisting of larger intake and exhaust fans.

Ensure the heater is installed so it is in line to or slightly
below the exhaust fan at the opposite end of the green­house.

The mechanical air exchange system shall be interlocked
to the heater to prevent operation should the air exchange

system not operate.

Regardless of air exchange system used, it is
recommended to install a CO/CO2 meter to ensure
workplace safety.

Increased ventilation rates may be required to ensure
low levels of these and other combustion gases as
listed in these instructions.

1. Read all safety precautions and follow L. B. White

recommendations when installing this heater. If during
the installation or relocating of heater, you suspect that
a part is damaged or defective, call a qualied service
agency for repair or replacement.

2. Ensure the heater is properly positioned and, using a

level, is hung level. Install according to minimum safe
distances from combustible materials. Safe clearances
are given on the heater’s data plate and on page 4 of

the manual.

U.S. standards for

maximum heater

discharge:

CO (ppm rise) 5.0

NO2 (ppm rise) 0.5

CO2 (ppm) 4,000

Ethylene (ppm) .015

WARNING

Burn Hazard

Can cause property damage, severe injury or death.

To avoid dangerous accumulation of fuel gas, turn
off gas supply at the appliance service valve before
starting installation, and perform gas leak test after
completion of installation.

Bloom 400 Greenhouse Heater

www.lbwhite.com

Owner’s Manual • Bloom 400

10

WARNING

Fire and Explosion Hazard

■ Do not use open ame (matches, torches,

candles, etc.) in checking for gas leaks.

■ Use only approved leak detectors.

■ Failure to follow this warning can lead to res

or explosions.

■ Fires or explosions can lead to property dam-

age, personal injury or loss of life.

3. L.P Gas Installation Requirements

Ensure all L.P. gas containers are secured and

protected from people, vehicular trafc and

contact. L.P. gas containers must be located on

a at,level, and stable surface.

Contact your local authorities, L.P. gas dealers, or re
marshalls for specics dealing with installation in your

area.

4. The heater’s gas pressure regulator (with pressure

relief valve) must be protected from adverse weather
conditions (rain, ice, snow) as well as from building
materials (tar, concrete, plaster, etc.) which can affect
safe operation and could result in property damage

or injury.

5. The heater’s gas regulator (with pressure relief valve)

should be installed outside the building. Any regulators
located inside the building must be properly vented to
the outside. Local, state, and national codes govern
regulator installation.

6. Gas utilization equipment connected to a piping sys­tem shall have an accessible, approved manual shut-

off valve installed within 6 ft. (1.83 m) of the heater.

7. Check all connections for gas leaks using approved
gas leak detectors. Gas leak testing is performed as
follows:

-- Check all pipe connections, hose connections, ttings

and adapters upstream of the gas control with ap-

proved gas leak detectors.

-- In the event a gas leak is detected, check the compo-

nents involved for cleanliness and proper application of
pipe compound before further tightening.

-- Tighten the gas connections as necessary to stop the

leak.

-- After all connections are checked and any leaks are

stopped, turn on the main burner.

-- Stand clear while the main burner ignites to prevent

injury caused from hidden leaks that could cause
ashback.

-- With the main burner in operation, check all

connections, hose connections, ttings and joints

as well as the gas control valve inlet and outlet con­nections with approved gas leak detectors.

-- If a leak is detected, check the components
involved for cleanliness in the thread areas and
proper application of pipe compound before further

tightening.

-- Tighten the gas connection as necessary to stop
the leak.

-- If necessary, replace the parts or components
involved if the leak cannot be stopped.

-- Ensure all gas leaks have been identied and
repaired before proceeding.

8. A qualied service agency must check for proper-

operating gas pressure upon installation of the

heater.

9. Always use pipe thread compound that is resistant

to propane and natural gas on threaded connec­tions.

10. Light according to instructions on heater or within

owner’s manual.

11. Make sure the heater has the proper gas regulator

for the application. A regulator must be connected

to the gas supply so that gas pressure at the inlet
to the gas valve is regulated within the range

specied on the dataplate at all times. Contact
your gas supplier, or the L.B. White Co., Inc. if you
have any questions.

12. This heater is congured for use for propane gas

vapor withdrawal only. Do not use the heater

in an propane gas liquid withdrawal system or
application. If you are in doubt, contact the L.B.

White Co., Inc.

13. The heater must be installed so as not to interfere

with or obstruct normal exits, emergency exits,

doors and walkways.

14. Any thermostatic temperature control can fail.

Control failure can result in an over-heat or under-

heat condition. Always check any temperature

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

11

control to make sure the heater turns on and off
within proper differentials of the control being used.

15. Take time to understand how to operate and maintain
the heater by using this Owner’s Manual. Make sure
you know how to shut off the gas supply to the build­ing and also to the individual heater. Contact your

fuel gas supplier if you have any questions.

16. Any defects found in performing any of the service or

maintenance procedures must be eliminated and de-

fective parts replaced immediately. The heater must
be retested by properly qualied service personnel
before placing the heater back into use.

17. If the heater is rigid mounted and incapable of

movement, installations not using a gas hose must

connect dimensionally using American National
Standard B36-10. Aluminum piping or tubing shall

not be used. Copper tubing when used for conveying
natural gas shall be internally tinned or equivalently

treated to resist sulphur.

18. Do not exceed the input rating or the burner manifold

pressure given on the heater’s data plate. Do not

use an orice size other than that provided by the
manufacturer for the specic input rating, fuel type,

and altitude.

Sediment Trap
Requirements

A sediment trap shall be installed to prevent contaminants

(pipe compound, chips, pipe scale) from entering the gas

control valve. These contaminants may cause the gas control

to malfunction resulting in a gas leak.

The sediment trap is an accessory and not included with the
heater.

You may order part number 500-132226 or obtain the follow­ing materials through local purchase:

(1) 3/4 in. NPT tee
(1) 3 in. x 3/4 in. NPT nipple
(1) 3/4 in. cap

Install the trap at the outlet of the shut-off valve or as close to
the gas inlet of the heater as practicable.

See Fig. 2.

FIG. 2

TO
EQUIPMENT
INLET

GAS SUPPLY INLET

TEE
FITTING

3 IN. (80 MM)

MINIMUM

NIPPLE

CAP

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

12

Hanging the Heater

FIG. 3

GAS REGULATOR

(POSITIONED WITH ITS VENT

DIRECTED DOWN)

ENSURE THE GREENHOUSE STRUCTURE

IS CAPABLE OF SUPPORTING THE WEIGHT

OF THE HEATER AND ITS GAS SUPPLY LINE.

WEIGHT OF HEATER IS 125 LBS. (57 KG).

USE ONLY CHAIN OR CABLE TO

HANG HEATER. TIGHTLY SECURE

TO THE GREENHOUSE STRUCTURE

AS SHOWN TO PREVENT HEATER

MOVEMENT WHEN THE MOTOR

STARTS.

USE ONLY CHAIN OR CABLE TO HANG HEATER.

TIGHTLY SECURE TO THE GREENHOUSE STRUC-

TURE AS SHOWN TO PREVENT HEATER MOVEMENT

WHEN THE MOTOR STARTS.

GAS SHUT-OFF

SEDIMENT TRAP

8 FT. MINIMUM (2.43 M)

END VIEW

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

13

Regulator and Gas Hose

Regulator Requirements

The low pressure regulator supplied at the heater’s gas

inlet regulates a gas supply inlet pressure of 13.5 inches
W.C. (3.36 kPa) maximum down to a minimum gas sup­ply pressure of 7.0 inches W.C. (1.74 kPa).

With pressures between the maximum and minimum, the

regulator reduces the pressure down to the proper burner

manifold pressure for either LP or natural gas.

Pressure higher than the maximum inlet pressure
requires a regulator of proper capacity and pressure set-

ting supplied by the installer to ensure proper operation

of the heater.

Regulators are available as an accessory for either LP or

natural gas applications.
LP Gas: part number 500-132229
Natural Gas: part number 500-132228
These are to be used as seconds stage regulators, and
shall be installed so the regulator’s vent is directed down.

For LP Gas:

-- If the gas installation will be plumbed using 5 -10 PSIG/

34.5 -68.9 kPa, install the regulator on the gas line to

reduce high pressure to low pressure required at the

heater’s gas inlet.

For Natural Gas:

-- Use the regulator ONLY if the supply pressure is 2

PSIG/13.8 kPa or greater.

The regulator shall be connected to the gas supply using
the proper plumbing devices.

Gas Hose Requirements

This heater requires a gas hose of 3/4 in. (1.9 cm)
minimum diameter for lengths up to 15 ft. (4.6 m). Longer
hoses will potentially require larger diameters.

The 15 ft. (4.6 m) hose is available from L.B. White as

part number 500-25965, and is ordered as an accessory

(not included with the heater).

Connect the gas hose to the low pressure regulator
at the heater’s gas inlet, using pipe thread compound
that is resistant to LP and natural gas on the threaded
connections.

Connect its opposite end to the gas supply with appropri-

ate ttings.

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Owner’s Manual • Bloom 400

14

ATTENTION:

When connecting to a building controller, provide a

minimum 5 second time delay when switching from

Vent to Heat to allow the pressure switch contacts to
open. Failure to provide a minimum 5 second delay will
prevent operation when in Heat mode.

Connecting the Heater to
the Electrical Supply

Connect the heater to an approved 240/60/1, 15 amp
electrical supply with a secure earth ground and proper
electrical polarity.

The heater must have a properly grounded electrical
supply, otherwise the ignition control will not be able to
prove ame. The heater will cycle on/off and
eventually shut-down.

Route the electrical supply wiring through the water tight

connector at the top of the heater’s control box.

FIG. 4

Connecting to a Building Controller

The heater is designed to be operated in a heating
or ventilation mode by a greenhouse environment
controller. Refer to Fig. 5 for connection of the environ­ment controller to the terminal strip within the heater’s

control box.

FIG. 5

N

COM

150-132181 REV.A

240VAC

240VAC

120VAC

Connecting to a Separate Remote Thermostat.
(Heating ONLY)

The heater may be operated by a remote thermostat

if an environment controller is not used. Refer to the
following instructions and Fig. 5.

1. Disconnect the factory installed BLACK wire at the
terminal strip within the heater’s control box.

2. Connect a thermostat wire to the terminal strip at
this point.

3. Run the wire to the L1 terminal (incoming power) on

the thermostat.

4. Connect a wire to the HEATING terminal in the
thermostat and to the BLACK wire previously discon­nected to the terminal strip in the heater’s control

box. Use a wire nut, tightening securely.

5. Ensure a ground wire is rmly connected between

the thermostat and the heater ground.

6. Connect the heater to its electrical supply and turn
the thermostat up above room temperature. The
heater will start.

BLACK

RED

BLUE

WHITE

GREEN

COM

240VAC

240VAC

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

15

Start-Up Instructions

1. Ensure the heater is properly connected to the electrical
supply.

2. Open the fuel supply valve to the heater’s gas inlet.

3. Check for gas leaks before lighting with approved leak

detectors.

4. Set the temperature control to a setting above room
temperature.

5. The heater will start.

ATTENTION:

The ignition control will attempt three ignition trials. If ignition
is not achieved after the third trial, the heater will shut down.
Refer to the troubleshooting section in this manual or scan

the QR code on the heater.

Cleaning Instructions

Shut-Down Instructions

If the heater is to be shut down for cleaning, maintenance,
or repair, follow steps 1-4. For normal shut down, set the

thermostat to a lower setting.

1. Close the fuel supply valve at the fuel source.

2. Allow the heater to burn off any gas remaining in its gas

supply line.

3. Set the temperature control to its lowest setting.

4. Disconnect the heater from its gas and electrical supplies.

1. Clean the heater once each year at the very minimum.

2. Use a soft brush, or dry rag on its case and internal com-

ponents. At this time dust off the motor case to prevent
the motor from overheating.

3. Ensure the fan blade is free of dust/dirt build-up.

WARNING

Fire, Burn and Explosion Hazard

■ This heater contains electrical and mechanical compo-

nents in the gas management, and safety systems.

■ Such components may become inoperative or fail due

to dust, dirt, wear and aging.

■ Periodic cleaning and inspection as well as proper

maintenance are essential to avoid serious injury or
property damage.

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

16

WARNING

This heater must not be washed. Use of a pressure
washer, water, or liquid cleaning solution on the control

components can cause severe personal injury or property

damage due to water and/or liquids:

■ In electrical components, and wires causing electrical
shock or equipment failure.

■ On gas control valves causing corrosion which can
result in gas leaks and re or explosion from the leak.

■ Clean all components of the heater with pressurized air,

a dry brush, or a dry cloth.

Maintenance Instructions

BEFORE EACH USE:

1. The area surrounding the heater shall be kept clear

and free from combustible materials, gasoline, and
other ammable vapors and liquids.

2. Check for gas leaks in all gas lines or hoses.

3. Inspect all gas hoses for nicks, cuts, or corroded
ttings. Replace the complete gas hose assembly if
defects are found.

4. Review all heater labels, such as warnings, wiring

diagrams, instructions, etc. for legibility. Ensure none

are cut, torn, or damaged. Any damaged labels must
be replaced immediately.

5. Check all wiring, associated terminals, and electrical

components within the heater for corrosion, frayed or

cut insulation, tight connections, etc. Repair or replace
as needed.

ANNUALLY:

1. Have your gas supplier check all gas piping for leaks or

restrictions in the gas lines.

2. Gas regulators must be inspected periodically to make
sure that the regulator’s vent is not blocked. Debris,
insect nests, insects, snow, or ice on a vent can cause

excess pressure at the heater.

3. Regulators can wear out and function improperly.

Have your gas supplier check the date codes on the
regulators and check delivery pressures to ensure that
all regulators are reliable.

4. Have your gas supplier clean out the sediment trap to
remove any gas line contamination.

Service Instructions

WARNING

Burn Hazard

■ Some heater surfaces are hot for a period of
time after the heater has been shut down.

■ Allow the heater to cool before performing

service, maintenance, or cleaning.

■ Failure to follow this warning will result in

burns causing injury.

WARNING

Fire and Explosion Hazard

■ Do not disassemble or attempt to repair any

heater components or gas train components.

■ All component parts must be replaced if
defects are found.

■ Failure to follow this warning will result in
re or explosions, causing property damage,

injury, or death.

WARNING

■ This heater can start at anytime.

■ Only qualied gas heater service personnel

shall service and repair this heater.

■ Before servicing or repair:

- Close all fuel supply valves

- Disconnect the heater’s electrical supply.

■ Failure to follow this warning can lead to
electrical shock or burns, resulting in injury
or death.

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

17

General

1. Close the heater’s fuel supply valve and disconnect
its electrical supply before servicing.

2. Disconnect the appropriate electrical leads for the

electrical component being replaced.

3. Remove the heater’s control box cover for access to

the ignition control, pressure switch, relay, selector
switch and circuit breaker.

4. The differential air pressure switch, located in the
control box, must not be bypassed prior to motor
start-up. If bypassed prior to the motor starting, the

ignition control will not allow heater operation.

5. Disconnect the heater’s gas supply line if replacing

the heater’s low pressure regulator or gas solenoid
valve.

6. For reassembly, reverse the respective service
procedure.

7. Clean the burner orice holes with compressed air.
Do not use drills, broaches, etc. to clean the orice’s

holes. Doing so may enlarge the holes causing
combustion or ignition problems.

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

18

Control Box Components

FIG. 6

A Ignition Control

B Air Pressure Switch

C Heat Relay

D Vent Relay

E Red Status Light

A. Ignition Control

The ignition control is an electronic circuit board

that starts the fan motor, and monitors burner ame

presence through the ignitor and earth ground. (A

good, secure earth ground is required for continued
operation. If the earth ground is missing or poorly

connected, the ignition control will not be able to

prove ame, and it will eventually shut the heater
down)

Refer to the following and Fig. 7 to understand the

ignition control’s terminal designators when doing
voltage checks on the ignition control.

LED: Diagnostic light connection
MV: 120 VAC from ignition control to gas solenoid

valve.

PSI: 120 VAC from air pressure switch to ignition

control.

IND: 120 VAC from ignition control to motor relay.

The relay then sends the power to the motor.

L1: 120 VAC incoming power supply to ignition

control.

R: No terminal.
PSO: 120 VAC from ignition control to air pressure

switch.

W: No terminal.
FS: No terminal.
GND: Power cord and chassis ground.
NEU 3: No connection
NEU 2: Ignition control neutral
NEU 1: Neutral for gas control valve.

B

E

C

D

A

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

19

FIG. 7

B. Di󰀨erential Air Pressure Switch

The air pressure switch is a safety device that works with
the ignition control in ensuring that the motor is up to full
speed before the gas control valve opens and the igniter

sparks.

See Fig. 8. The differences between pressure in the
fan section (positive + pressure) and the burner section
(negative – pressure) close the switch contacts. Power
that is sent to the switch when there is a call for heat is

returned to the ignition control, “proving” to the ignition

control that the switch is functioning. The control then

allows the ignition trial to proceed.

Ensure the switch’s tubes are rmly connected and not
blocked with dirt. This can also prevent proper function
of the switch.

To determine if the switch is defective, either:

• By-pass the switch

-- Do so ONLY after the motor rst starts. By-passing the

switch prior to motor start-up will shut down the heater.

-- If the heater starts and burns, then the switch is
defective.

OR

• Obtain a volt meter and set it to AC volts.

-- Trace the electrical wire from terminal PSO to the

switch.

-- Start the heater

-- Verify 120 VAC to the switch.

-- Do the same test at the other terminal on

the switch.

-- If there is 120 VAC to the switch, but

voltage is not coming out being fed back

to PSI on the ignition control, replace the
switch.

When doing maintenance or service on the switch pressure
tubes, ensure the tubes are positioned as shown.

FIG. 8

FIG. 9

Relays

There are two relays in the control box. Although the same
part number, the relays are wired differently to control the
power supply to the motor for either Heat or Vent modes.

C. Heat Relay:

This relay receives incoming power from the greenhouse
temperature controller’s heating contacts and from the
heater’s ignition control to start the fan motor during the

heating phase.

See Fig. 10 and the terminal designators as shown below
when doing voltage checks on the heat relay.

Terminal Function

2 120 VAC from power supply to ignition control

(Heat)
4 120 VAC from relay to motor.
6 120 VAC to relay from power supply (Common)
8 120 VAC from relay to motor
0 120 VAC from ignition control (IND) to relay

(energizes relay)
1 120 VAC from power supply (Common)

POSITIVE (+)

NEGATIVE (-)

POSITIVE

PRESSURE

(+)

NEGATIVE

PRESSURE (-)

LED

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Owner’s Manual • Bloom 400

20

D. Vent Relay:

This relay operates the fan motor only when the green­house controller calls for air movement only (no heat).

See Fig. 10.

Terminal Function

2 120 VAC to relay from power supply (Vent)
4 120 VAC from relay to motor
6 120 VAC to relay from power supply

(Common)
8 120 VAC from relay to motor
0 120 VAC to relay from power supply (Vent)
1 120 VAC to relay from power supply

(Common)

FIG. 10

(Common illustration for Heat and Vent Relays)

D. Red Status Light

• The light will be constantly on during normal heating

operation.

• It will not be on when the switch is in vent mode.

• The red light will ash if a problem occurs. Count the

number of times it ashes & refer to Troubleshooting in

the manual.

Motor and Fan Assembly

1. Remove the fan guard.

2. Using a small wrench, reach around and loosen the

square head set screw on the motor side of the fan

hub.

3. Pull the fan from the motor shaft.

4. Remove the four bolts securing the motor’s base to

the motor mount.

FIG. 11

5. When reinstalling the fan, ensure the fan is ush with
shaft end and the set screw is positioned on the at of
the motor shaft before tightening.

FIG. 12

Burner Orifice and Igniter

See Fig. 13.

Burner orice
The burner orice has a series of jets through which gas is
passed for ignition by the spark igniter.

-- To remove the orice, use a 7/8 in. socket with ratchet.

-- Clean the holes with air if needed.

Igniter

The igniter is responsible for igniting the gas through spark.
It is also used as a ame sensor proving to the ignition
control that burner ame is present.

Cleaning / Servicing / Replacement

-- Using a 1/4 in. nut driver, remove the igniter plate

mounting screws.

-- Disconnect the ignition cable.

-- Check the igniter for cracks. Replace if necessary

FLUSH

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

21

-- Clean the igniter electrode and ground rod with a small,
wire brush or emery cloth.

-- Ensure igniter gap is 3 mm.

FIG. 13

Ignition Cable

The ignition cable provides high voltage from the ignition

control to the igniter to generate spark.

The cable is attached to the igniter and to the ignition

control in the control box.

Ensure the cable is securely connected at both ends. Poor

connections create poor spark and poor ame sense that

may cause the heater to shut down.

Testing the cable: Connect an ohm meter to both ends of
the cable. A good cable will read anywhere from 6 to 10 k

ohm.

Gas Control Valve

Gas Control Valve

The valve is operated when power is sent from the ignition

control to the solenoid valve during the ignition phase. The
solenoid stays open providing there is a good earth ground

and the ignition control can monitor burner ame presence

through the local sense ignitor.

1. Loosen either of the conduit collars “A”

2. Disconnect the solenoid valve wires.

3. Remove bolts “B”

4. Loosen are nut “C”

5. Remove gas control and regulator assembly from

heater.

6. Replace component as required.

FIG. 14

Gas Pressure Checks

Refer to the following procedure to ensure the heater is

operating at the correct pressure.

a. Using a 3/16 allen wrench, remove the pressure tap

plug at the side of the valve body. See Fig. 13.

b. Insert a 1/8 in. hose barb tting at the port and connect

to a low pressure gas gauge. (L.B. White part number

500-00764)

c. Once the gauge has been installed, start the heater.

d. With the heater operating, ensure the gauge registers

the burner manifold pressure given on the heater’s data

plate.

e. If the gauge is reading lower or higher pressure than

what is given on the data plate, the regulator controlling

inlet pressure to the heater requires adjustment.

f. Once the proper pressure has been established, remove

the gauge set and reinstall all pressure tap plug, tighten­ing securely.

A

3 mm

B

C

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

22

Troubleshooting Guide

READ THIS ENTIRE SECTION
BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.

The following troubleshooting guide provides
systematic procedures for isolating equipment

problems. THIS GUIDE IS INTENDED
FOR USE BY A QUALIFIED GAS
HEATER SERVICE PERSON. DO NOT
ATTEMPT TO SERVICE THESE HEAT­ERS UNLESS YOU HAVE BEEN
PROPERLY TRAINED.

TEST EQUIPMENT REQUIRED

The following test equipment will be required to

troubleshoot this system with minimal time and

effort.

• Digital Multimeter - for measuring AC voltage and

resistance.

• Pressure Gauge - for checking inlet and pres­sures at the gas control valve against dataplate
rating.

Ensure all wires and electrical connections are in

good condition before beginning to troubleshoot.

Refer to the system operation sequence in this sec­tion to gain an understanding as to how the equip­ment operates during a call for heat. Understanding
the sequence of operation is important as it relates

to problem solving.

The heater has a red status light. The

light will ash a specic pattern depending upon the
problem which is diagnosed. If the light is ashing,
the ash pattern will be followed by a pause and
then a repeat of the ash pattern until the problem

is corrected. Use the light to help diagnose the
problem.

Troubleshooting Flow Charts are provided to elimi-

nate problems. To use the ow charts effectively,
you must rst identify the problem.

HEATING MODE

Page

Red light is not on .................................................... 24

Red light is ashing:

A. One Time............................................................. 24

B. Two Times ........................................................... 25

C. Three Times ........................................................ 26

D. Four Times .......................................................... 26

D. Five Times........................................................... 26

VENTILATION MODE

A. Motor does not run .............................................. 27

B. Motor hums, does not run ................................... 27

Components should be replaced only after each step has
been completed and replacement is suggested in the ow
chart. Refer to the Servicing sections as necessary to
obtain information on disassembly and replacement proce­dures of the component once the problem is identied by
the ow chart.

HEATING DIRECT IGNITION OPERATION SEQUENCE:

• Voltage delivered to motor relay (Heat) and to ignition

control terminal L1.

• Red light on control panel is illuminated.

• Ignition control performs self- safety check.

- Internal components are tested.

• Ignition sequence begins:

- Ignition control sends 120 VAC to air pressure switch

from terminal PSO.

- Ignition control sends 120 VAC to motor (Heat) relay
from terminal IND.

- Motor relay receives voltage from ignition

control.

- Motor relay coil closes and sends voltage to

start motor.

- Air pressure switch closes.

- 120 VAC is returned to ignition control

terminal PSI.

- Ignition control sends high voltage to igniter.

- Igniter sparks.

- Ignition control sends 120 VAC to solenoid valve.

- Solenoid valve opens.

- Gas ignites.

- Flame sense proving occurs

- Ignition spark is stopped.

- Gas valve stays open.

- Room warms to desired temperature.

- Temperature controller is satised.

- Heater shuts down

• Process starts again on a call for heat.

WARNING

■ This heater can start at any time.

■ Troubleshooting this system may require oper-

ating the unit with voltage present and gas on.

Be careful when working on the heater.

■ Failure to follow this warning may result in

property damage, personal injury or death.

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

23

IGNITION FAILURE SEQUENCE:

• The rst trial for ignition takes approximately 10

seconds.

- If the rst trials for ignition fails, the ignition control
attempts two more trials for ignition.

- A total of 30 seconds for all three trials for

ignition.

- If the ignition control does not sense burner ame
or if the ame is extinguished, the control shuts the
heater down and goes into safety lock-out.

- Gas solenoid valve closes.

- Ignition spark stops.

- Fan motor stops.

- To retry for ignition, reset the ignition control by

turning the heater OFF and then ON using the
greenhouse temperature controller.

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

24

Problem

Red light not on

HE ATING M O D E

Does fan motor run?

Is controller set above

room temperature?

Does ignition control

receive proper voltage?

Defective wire between

relay and ignition

control.

Defective ignition control

Set controller above

room temperature.

Does heater light?

Replace LED

No

No No

Yes

Yes Yes

Yes

Red Light Flashing

One Time

Air pressure switch contacts

are closed on a call for heat

before fan motor star ts

Replace switch.

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

25

Two Times

Air pressure

switch contacts

do not close on a

call for heat

Does fan motor run?

Does motor relay

(Heat)receive voltage

from ignition control

at terminal 0

Check all wiring

between ignition

control and relay.

Is ignition control

receiving proper

voltage?

Is proper voltage

supplied to motor from

relay?

Defective motor.

Defective ignition

control.

Defective relay

Are there blockages at

air inlet of heater?

Is fan binding, bent, or

caked with dir t?

Is fan loose on motor

shaft?

Are air pressure tubes

blocked?

Do air pressure switch

contacts close? Check

continuity.

Does ignition control

send voltage to air

pressure swtich?

Defective air presure switch. Defective ignition control

Remove blockage.

Clean or replace

the fan.

Tighten fan blade set

screw

Remove tubes and

clean them with air.

No

No

No

No

No

No

No

No

No No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

26

Problem

Three Times

Indicates ignition

failure. The ignition

control is in safety

lockout.

Is the heater properly

grounded?

Is proper fuel supplied

to heater inlet?

Is proper gas pressure

supplied to heater?

Ensure heater is

properly grounded and

proper electrical polar-

ity at power supply

Connect proper gas

supply to heater. Open

all gas shutoff valves.

Provide proper gas supply pressure

to heater. Refer to dataplate. If LP

gas is used, ensure container is full.

No No No

Yes Yes Ye s

Four Times: If control module does not reset, then replace it (Internal board fault).

If module resets, then have qualied electrician check power source

for power quality problems. (Frequency, line noise, line spikes, loose

connections, too small wire gauge.

Five Times: Flame sense related problems. Check for cracked or dirty

igniter, improperly positioned sensor, or poor ame igniter

ground.

Does gas solenoid

valve open?

Does igniter spark?

Is igniter high voltage

lead securely connected?

Connect high

voltage lead

Is igniter properly

gapped?

Check igniter gap.

Regap to 3/16 in.

Determine if ignitor receives high voltage:

- CLOSE THE HEATER’S FUEL SUPPLY VALVE

- Disconnect ignition lead from ignition control.

- Position a screwdriver tip about 3/16 in. / 4.7 mm away

from ignition control where lead was connected.

- Start the heater

- If no spark is seen, replace the ignition control.

-If spark is observed, check the igniter for cracks, etc.

-Check ignition cable for continuity.

Clean the burner

orice holes.

Is proper voltage

supplied to gas valve?

Defective

gas valve.

Defective wires or connections.

If good, replace ignition control.

No

No

No No

No

Yes

Yes Yes

Yes

Yes

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

27

Problem

Motor does not run

Problem

Motor hums.

Does not run.

VENTILATION MODE

Is ventilation relay

receiving power at

terminals 6 and 8?

Is fan binding?

Does fan motor receive

proper voltage?

Check for damage to motor

and fan assembly.Repair or

replace as necessary.

Replace the motor.

Connect heater to

electrical supply.

Contact electrician if

nec essary.

Check for proper voltage to

ventilation relay from power supply

and from relay to motor. Contact

an electrician if poor voltage is

delivered to the relay.

Defective relay

Does relay send power

from terminals 4 and 8?

Defective motor

No

No

No

No

Yes

Yes

Yes

Yes

Bloom 400 Greenhouse Heater

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Owner’s Manual • Bloom 400

28

Electrical Connection and Ladder Diagram

MV

PSI

IND

L1

PS0

N3

N2

N1

IGC

R

BK

PDS

IG

GV

M

(230V)

1

8642

0

1

8

642

0

MR(V)

MR(H)

RBLBK

BK

BL

GR

W

R

GR

W

BL

R

BK

NEU

V

C

H

GR

GR
BK

R

R

BK

W

BK

N1N2N3

PS0L1IND

PSI

MV

H

C

V

NEU

IG

PDS

GV

M

MR(H)

MR(V)

BK:

BL:

GR:R:W:

C:

GV:H:IG:

IGC:M:MR(H):

MR(V):

NEU:

PDS:V: :

:

Black/Negro

Blue/Azul

Green/Verde

Red/Rojo

White/Blanco

Common/C

omún

Gas Control Valve/Valvula

de Control de Gas

Heat/

Calefacción

Igniter/Encendedor

Ignition Control/Control de Encendido

de Chispa

Motor

Motor Relay(Heat)/Relé del

Motor(

Calefacción

)

Motor Relay(Vent)/Relé del

Motor(

Ventilación

)

Neutral/Neutro

Pressure Differential Switch/Interruptor

de presión de aire diferencial

Vent/Ventilación

LED/Luz LED

Earth Ground/Conexiona tierra

ELECTRICAL CONNECTION DIAGRAM /DIAGRAMA DE CONEXIONES ELÈCTRICAS

IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THE HEATER MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A

TEMPERATURE RATING OF AT LEAST 302F (150 C).//SI SE DEBE CAMBIAR CUALQUIER CABLE ORIGINAL PROPORCIONADO CON EL APARATO, SE DEBE

CAMBIAR POR UN CABLE CON UNA CLASIFICATIÒN DE TERMPERATURA DE AL MENOS 302F (150 C).

ELECTRICAL LADDER DIAGRAM /DIAGRAMA ELÈCTRICO DE ESCALERA

150-132107 REV A

Bloom 400 Greenhouse Heater

Owner’s Manual • Bloom 400

29

Notes

Bloom 400 Greenhouse Heater

www.lbwhite.com

Owner’s Manual • Bloom 400

30

Service Parts Identification Schematic

3

11

4

2

1

18

15

16

17

14

10

9

6

8

7

5

13

12