Flagro FVO-750 Series Instruction Manual

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OPERATING INSTRUCTIONS MANUAL
(Please retain for future reference)
For
FVO-750 INDIRECT FIRED SPACE HEATERS
CERTIFIED FOR USE IN CANADA AND U.S.A.
As per CSA B140.8 Portable Oil Fired Heaters / CSA B140.02003 Oil Burning Equipment
Construction Heaters Unattended Type.
Issue date July 1, 2012
FLAGRO INDUSTRIES LIMITED
ST. CATHARINES, ONTARIO
CANADA

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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.
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.
WARNING:
INTENDED USE IS PRIMARILY THE TEMPORARY HEATING OF BUILDINGS
UNDER CONSTRUCTION, ALTERATION, REPAIR OR EMERGENCIES ONLY.

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This heater is designed and approved for use as a
construction heater under CSA B140.8 Portable Oil
Fired Heaters / CSA B140.02003 Oil Burning Equipment.
We cannot anticipate every use which may be made
of our heaters. CHECK WITH YOU LOCAL FIRE
SAFETY AUTHORITY IF YOU HAVE QUESTIONS
ABOUT APPLICATIONS.
Other standards govern the use of fuel gases and heat
producing products in specific applications. Your local
authority can advise you about these.
SPECIFICATIONS
Model …………………………………………………….…. FVO-750
Input …………………………………………………….…... 750,000 btuh
Fuel …………………………………………………………. No.1, No. 2,
Diesel or
Kerosene
Fuel Pressure …………………………………………….... 160 psi
Nozzle ………………………………………………………. 4.50 x 60W
(Delavan)
Ignition ………………………………………………………. Direct Spark
…….……………………………………………...…. Thermostat
Control
Air Circulation ………………………………………………. 7000 cfm
Fuel Consumption ………………………………………...... 5.42 Gal/hr
Approved …………………………………………………...... cETLus listed

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INSTALLATION:
The installation of this heater for use with No.1, No.2, Diesel or Kerosene and
shall conform with local codes or, in the absence of codes, with the National Fuel
Gas Code ANSI Z223.1/NFPA 54. Installation of the unit shall be in accordance
with the regulations of the authorities having jurisdiction or the CSA Standard
B139.
CLEARANCE TO COMBUSTIBLES:
TOP FRONT SIDES REAR FLUE PIPE
1 ft 1 ft 1 ft 2 ft 2 ft
FUEL: This heater will operate with No.1, No.2, Diesel or Kerosene.
Note: No.1 Fuel Oil or Kerosene must be used for
temperatures less than –10º C (8º F).
ELECTRICAL:
This appliance is equipped with a grounded receptacle for your protection against
shock hazard and should be plugged directly into a properly grounded plug. The
electrical grounding of the heater shall be in compliance with the National
Electrical Code, ANSI/NFPA 70, or CSA C22.1, Canadian Electrical Code, Part I.
THIS APPLIANCE WILL OPERATE WITH 1 PHASE OR 3 PHASE POWER.
208V-230V SUPPLY MUST BE AVAILABLE.
POWER SUPPLY:
SINGLE PHASE: 208V-230V, 30AMP BREAKER OR 30 AMP TIME DELAY
FUSE, 8/3 AWG AT 100FT MAX.
OR
THREE PHASE: 208V-230V, 25AMP BREAKER OR 25AMP TIME DELAY
FUSE, 10/4 AWG AT 100FT MAX.
**POWER CORD PLUG ENDS PROVIDED WITH UNIT FOR 1 PHASE OR 3
PHASE OPERATION
This heater is equipped with a VFD “Variable Frequency Drive” to control the
primary fan acceleration & de-acceleration. The VFD has been password
protected to prevent improper use. If access to VFD controls is required for
troubleshooting, please contact manufacture for assistance.

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TRANSFORMER OFFERS 4 DIFFERENT INPUT POWER SUPPLY OPTIONS
FACTORY SET AT 220V.
IT IS IMPORTANT TO CHANGE YOUR INPUT CONNECTION BASED ON YOUR
POWER SUPPLY, AS THE BURNER WILL NOT OPERATE PROPERLY
INPUT CONNECTIONS

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FLUE PIPE: For outdoor applications the flue pipe connection must
terminate with a vertical run of at least 2ft complete with rain
cap.
For indoor installations the venting must consist of a minimum
2ft vertical run to a maximum of 20ft total vent length. See
diagram below for horizontal vent installation.
The vent outlet on the heater is 8” diameter. Certified venting
must be used at all times. Vent cap must be installed in
situations where downdrafts occur. All venting must
correspond with the CSA B149 standard or in its absence,
local codes.
FLUE OUTLET OF HEATER
EXTERIOR WALL
FLUE TERMINATIONS
B
C
A
45 DEG ELBOW
90 DEG ELBOW
A - Vertical vent run must be a minimum of 2ft from heater outlet.
B - Maximum horizontal run is 20ft
Note: 90deg Elbow = 5ft
C - Vent termination in horizontal position must be minimum 2ft from wall.
A 45deg elbow is recommended at horizontal termination.
Note: Horizontal flue run - Rise ratio 1:10.

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DUCTING: Heater duct with a minimum temperature rating of 300 deg F
including wire reinforcement to prevent collapsing. Heater is
designed for use with 2 x 16” diameter ducts equipped with
gear clamp couplings (FV-HDG16).
Install ducting to the heater outlet using gear clamps provided
on the collar of the ducting. Ducting should be inspected
periodically for tearing and/or wear marks. Ducting should be
stored in a dry area when not in use
MAINTENANCE:
1. Every construction heater should be inspected before each use, and at
least annually by a qualified service person. Incorrect maintenance my
result in improper operation of the heater and serious injury could occur.
2. Service and Maintenance only to be performed by a qualified service person.
3. The hose assemblies shall be visually inspected prior to each use of the
heater. If it is evident there is excessive abrasion or wear, or the hose is cut, it
must be replaced prior to the heater being put into operation. The replacement
hose assembly shall be that specified by the manufacturer.
4. The flow of combustion and ventilation air must not be obstructed. Be sure to
check the fan assembly and ensure that the motor and blade are operating
properly.
5. Compressed air should be used to keep components free of dust and dirt build
up. Note: Do not use the compressed air inside any piping or regulator
components.
6. Change fuel filter insert (Part# FVO-TLSF) once per year.
7. Change oil nozzle (Part# FV-738) once per year.
8. High Limit Switches (Part# FV-706 & FV-707) should be checked each
season. These limit switches will ensure the burner shuts down if the
temperature exceeds 200º F at rear of unit and 250º F at the outlet.
9. Heat Exchanger should be cleaned if smokey conditions continue even after
the air adjustments on the burner are made.

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START UP INSTRUCTIONS:
1. Position heater properly & on a level surface before operating
2. Connect Fuel supply to heater
3. Ensure the (Thermostat / Manual) selector switch is in the “OFF”
position
4. Attach power supply, 208-230V/1-phase or 208-230V/3-phase to
appropriate receptacle.
5. Turn disconnect switch (Single or Three phase) depending on power
supply to “ON” position.
6. Move switch to “MANUAL” position for manual control.
“OR”
7. Move switch to “THERMOSTAT” position for thermostatic control.
Please Note:
1. If using Thermostat kit, the heater must be started in Thermostat position.
2 When changing between manual and thermostat operation, the heater
must be left in the “OFF” position until blower fan completely shuts down
before changing position to prevent the burner from locking out.
3. When using a generator for electrical supply, make sure the generator
is properly grounded and is at a 60Hz frequency.
4. In the event that a Generator is being used and runs out of fuel, make sure
the heater switch is in the “OFF” position before restarting generator, failure
to do so may damage heater.

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TO SHUT DOWN:
1. Close main fuel supply valve
2. Move Thermostat/Manual switch to “OFF” position.
3. Waiting until blower fan shuts down (3 minutes approx.)
4. Turn Disconnect switch (single phase or three phase) depending on
power supply to “OFF” position.
5. Turn main power breaker to “OFF” position
6. Disconnect heater from fuel supply.
IF HEATER FAILS TO START:
1. Press manual reset button at rear of burner.
2. Check fuel level. There must be 6-8 gallons of fuel in the tank for the
heater to start properly.
3. Make sure there are no air locks in fuel lines or filter.
4. Ensure proper power supply is being used.
5. Check for dirty fuel filter or blocked fuel supply line.
6. Check burner nozzle assembly.
NOTE: IF THE BURNER HAS BEEN RESET SEVERAL TIMES THERE
MAY BE AN ACCUMULATION OF OIL IN THE CHAMBER! DO NOT
CONTINUE TO TRY AND START THE HEATER!
DRAIN OIL FROM HEAT EXCHANGER USING DRAIN HOLE AT FRONT
OF HEAT EXCHANGER FOR 15-20 MINUTES BEFORE ATTEMPTING TO
RELIGHT. LET REMAINING EXCESS OIL BURN OFF BEFORE CHECKING
COMBUSTION OF UNIT.

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SAFE OPERATION PRECAUTIONS:
1. Do not fill external fuel tank while heater is in operation.
2. Do not attempt to start heater if excess oil remains in the heat
exchanger.
3. Use selector switch to shut down the heater.
Do not try to shut down the heater by unplugging the electrical cord.
Note: DAMAGE TO THE HEATER WILL OCCUR
4. Do not plug anything other than the thermostat into the “Thermostat”
plug.
5. Do not use any fuel other than those listed on rating plate.
6. Follow electrical requirements shown on rating plate and/or Electrical
requirements section of this manual.
7. Before removing any guards or performing any maintenance, be sure
that the main power supply is disconnected.
8. All external fuel supply tanks must include a vent.

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COMBUSTION AIR ADJUSTMENTS:
NOTE: Proper combustion air adjustment must be achieved using a certified
combustion analyzer and smoke tester to ensure complete
combustion.
The air adjustment should be made to achieve 10% CO
2
and No. 1 or “trace”
smoke. (Bacharach Scale)
AIR SHUTTER SETTING LOW FIRE SETTING
A) Loosen PRESSURE RELEASING SCREW (1). (One turn is sufficient).
This permits the fuel pressure to bleed off to the pump return port and
the burner to operate continuously at the low fire rate.
B) Loosen RETAINING NUT (2).
C) Turn the ADJUSTING SCREW (3) until the top of the air shutter (9) is
correctly positioned according to the Burner Set-up Chart.
D) Use instruments to establish the proper settings for maximum CO 2 and
a smoke reading of zero.
E) Hold ADJUSTING SCREW (3) in position and secure by tightening
RETAINING NUT (2).

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F) Retighten PRESSURE RELEASE SCREW (1).
Note: The low fire pressure regulator is pre-set at the factory to 100 PSI (7
bar). To vary or regulate this pressure it is necessary to attach a pressure
gauge to the PRESSURE PORT (6). Loosen the PRESSURE RELEASE
SCREW (1) as in step A above. Regulate the pressure by turning the
PRESSURE REGULATING SCREW (5). The corresponding pressure can be
read on the pressure gauge attached to the PUMP PRESSURE PORT (6).
MAIN FLAME SETTING
A) Be sure that the burner is operating at high fire.
B) Set the pump pressure by attaching a pressure gauge to the Pressure
port (6) and adjust the pressure by turning the pressure regulator
adjustment screw (10).
Loosen the RETAINING NUT (7), and turn the BOLT (8) in a
counterclockwise direction until about 3/4 of an inch of thread is visible.
Using the setting taken from the Burner Set-up Chart, column 5, position
the air shutter (9) so that the top of the shutter is aligned with the proper
index line indicated on the air intake side of the burner housing. Holding
the shutter in this position, turn ADJUSTING BOLT (8) in a clockwise
direction until a resistance is met.
C) The final position of the air adjustment plate will vary on each
installation. Use instruments to establish the proper settings for
maximum CO 2 and a smoke reading of zero.
NOTE: Variations in flue gas, smoke, CO 2 and temperature readings may be
experienced when the burner cover is put in place. Therefore, the burner cover
must be in place when making the final combustion instrument readings, to
ensure proper test.

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BURNER SET-UP CHART
1 2 3 4 5
ACTUAL
FIRING RATE
± 5%
NOZZLE
SIZE
PUMP
PRESSURE TURBULATOR
SETTING
AIR
DAMPER
SETTING
GPH GPH PSI BAR
5.42 4.50 x 60°W 160 11 5 5
* Note – Air damper setting is typically set at 5 for operation in colder
temperatures. A combustion analyzer should always be used when setting the
burner.

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ELECTRICAL CONNECTIONS
It is advisable to leave the control box off the sub-base while completing the
electrical connections to the burner.
Using the appropriate diagram below, make electrical connections to the
burner. All wiring must be done in accordance with existing electrical codes,
both national and local.
When all electrical connections have been made, the control box may be put
back in place on the sub-base.
WARNING: DO NOT activate burner until proper oil line connections have
been made, or failure of the pump shaft seal may occur.

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REMOTE SENSING OF SAFETY LOCKOUT: The SAFETY SWITCH in the
530SE CONTROL BOX is equipped with a contact allowing remote sensing of
burner lockout. The electrical connection is made at terminal 4 (●) on the SUB-
BASE. Should lockout occur the 530SE CONTROL BOX will supply a power
source of 120Vac to the connection terminal. The maximum allowable current
draw on this terminal (4) is 1 Amp.
WARNING: If a neutral or ground lead is attached to this terminal, the
CONTROL BOX on the burner will be damaged should lockout
occur.

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INSERTION / REMOVAL OF DRAWER ASSEMBLY
A) To remove drawer assembly, loosen SCREW (3), then unplug CONTROL
BOX (1) by carefully pulling it back and then up.
B) Remove the AIR TUBE COVER PLATE (5) by loosening the two retaining
SCREWS (4).
C) Loosen SCREW (2), and then slide the complete drawer assembly out of the
combustion head as shown.
D) To insert drawer assembly, reverse the procedure in items A to C above, and
then attach fuel line to the pump.

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NOZZLE PLACEMENT
A) Remove the NOZZLE ADAPTER (2) from the DRAWER ASSEMBLY by
loosening the SCREW (1).
B) Insert the proper NOZZLE into the NOZZLE ADAPTER and tighten securely
(Do not over tighten).
C) Replace adapter, with nozzle installed, into drawer assembly and secure with
screw (1).
ELECTRODE SETTING

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TURBULATOR SETTING
A) Loosen NUT (1), then turn SCREW (2) until the INDEX MARKER (3) is aligned
with the correct index number as per the Burner Set-up chart, on page 12.
B) Retighten the RETAINING NUT (1)
NOTE: Zero and five are scale indicators only. From left to right, the first line is
5 and the last line 0.
OIL LINE CONNECTIONS
Note: Pump pressure must be set at time of burner start-up. A pressure gauge is
attached to the PRESSURE PORT (8) for pressure readings. Two PIPE
CONNECTORS (5) are supplied with the burner for connection to either a single or a
two-pipe system. Also supplied are two ADAPTORS (3), two female 1/4” NPT, to adapt
oil lines to burner pipe connectors. All pump port threads are British Parallel Thread
design. Direct connection of NPT threads to the pump will damage the pump body.
Riello manometers and vacuum gauges do not require any adaptors, and can be safely
connected to the pump ports. An NPT (metric) adapter must be used when connecting
other gauge models.

FV-750– PARTS LIST
FV-726
BOLT ON HINGE
FV-725
REAR DOOR LATCH HIGH LIMIT
FV-706 – 250F
FV-707 – 200F
THERMOSTAT
FV-414B
GREEN LIGHT
S-1020C S-1020B
RED LIGHT
3 POSITION SWITCH
FV-712
ON/OFF POWER SWITCH
3 PHASE & 1 PHASE
FV-731 – 3 PHASE
FV-732 – 1 PHASE
3 PHASE & 1 PHASE
RECEPTACLE
FV-730 – 1 PHASE
FV-730A - COVER
FV-729 – 3 PHASE

3 PHASE/1 PHASE PLUG END 750V TRANSFORMER
FV-727 – 3 PHASE
FV-728 – 1 PHASE FV-704
FV-750 PARTS LIST
15 H.P. VFD
FV-703
POWER RELAY
FV-734 – POWER RELAY
GROUND LUG
FV-714
6AMP FUSE/2 POLE CLASS
CC FUSE HOLDER
15 AMP BREAKER
FV-722 FV-708 – 6 AMP FUSE
FV-709 – 2 POLE HOLDER
FV-720 – 7.5 HP contactor (2 BASE)
FV-721 - AUXILARY CONTACT
BLOCK ( TOP RIGHT SIDE)
CONTACTORS/BLOCK