Flagro FVNP-400 Instruction Manual

OPERATING INSTRUCTIONS MANUAL
(Please retain for future reference)
For
FVNP-400 INDIRECT FIRED SPACE HEATERS
CERTIFIED FOR USE IN CANADA AND U.S.A.
As per Standard ANSI Z83.7/CSA 21.4 2000 Gas Fired Construction Heaters / Unattended Type.
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.
This heater is designed and approved for use as a

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construction heater under Standard ANSI Z83.7/
CGA 2.14. 2000.
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 …………………………………………………….…. FVNP-400
Input …………………………………………………….…... 390,000 btuh
Fuel …………………………………………………………. Propane /
Natural Gas
Manifold Pressure …………………………………………. 1.5” W.C. Propane
2.0” W.C. NG
Maximum Inlet Pressure ………………………………… 13.0” W.C. Propane
10.0” W.C. NG
Ignition ……………………………………………………… Direct Spark Ignition
…….……………………………………………...… Thermostat Control
Air Circulation ………………………………………………. 2500 cfm
Fuel Consumption ………………………………………..... 18.5 lbs/hr Propane
380 cfh NG
Approved …………………………………………………..... cETLus listed
INSTALLATION:

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The installation of this heater for use with natural gas shall conform with local
codes or, in the absence of codes, with the National Fuel Gas Code ANSI
Z233.1/NFPA 54 and the Natural Gas and Propane Installation Code, CSA
B149.1-00. This heater must be installed by a qualified gas technician, following
local codes published by the authority having jurisdiction. All installations
performed in the state of Massachusetts must be completed by a qualified
plumber and gas fitter of the State of Massachusetts.
The installation of this heater for use with propane tank or cylinder shall conform
with Local codes or, in the absence of local codes, with the Standard for the
Storage and Handling of Liquefied Petroleum Gases, ANSI Z233/NFPA 54 and
the Natural Gas and Propane Installation Code, CSA B149.
This heater must be located at least 10ft (3m) from any propane gas cylinder.
This heater shall not be directed toward any propane gas container within 20ft
(6m).
CONNECTING THE CYLINDER
If cylinders are used to supply the heater, no cylinders smaller than 100lb
capacity shall be used. These cylinders must supply a vapor withdrawal only.
1. All cylinder connections must be made using a wrench to tighten the POL
fitting.
2. Be sure that the cylinder valve is in the closed position when connection or
disconnecting the cylinder.
3. A soap and water solution must be applied to all connections in order to
leak check the system.
The gas must be turned off at the propane supply cylinder(s) when the heater is
not in use. When the heater is to be stored indoors, the connection between the
propane supply cylinder(s) and the heater must be disconnected and the
cylinders removed from the heater and stored in accordance with Standard for
the Storage and Handling or Liquefied Petroleum Gases, ANSI/NFPA 58 and
CSA B149.1, Natural Gas and Propane Installation Code.

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PIPING: This heater must be installed by a qualified gas technician following
local codes published by the authority having jurisdiction. Sizing of
supply piping must be determined using the length of pipe run as
well as total btuh rating of the appliance(s). Appropriate piping
tables must be used to determine size of supply piping dependant
on the length of run from source.
PRESSURES: MAXIMUM INLET PRESSURES: LP: 13.0 IN. WC.
NG: 10.0 IN. WC.
MINIMUM INLET PRESSURES: LP: 8.0 IN. WC.
NG: 4.0 IN. WC.
This heater must be supplied by pressures indicated on the
approval label. Over pressure may cause controls to fail.
DO NOT supply this unit with more than ½ psig (14.0 in.
W.C.)
Note: A second stage regulator must be installed if the
supply pressure exceeds ½ psig.
FUEL: This heater is a dual fuel heater and operates on propane &
natural gas. The manifold pressures are listed on the
approval label.
You do not need to change any of the burner components,
you just however, make sure the fuel selector valve is in the
proper fuel position.
HOSES: All hoses used to connect this heater of fuel supply must be
Type 1 approved propane / natural gas hose assemblies.

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ELECTRICAL: WARNING
Electrical Grounding Instructions
This appliance is equipped with a three-prong (grounding)
plug for your protection against shock hazard and should be
plugged directly into a properly grounded three-prong
receptacle.
115v supply must be available. Please note that the heater
requires 15 amps for proper operation. Ensure appropriate
gauge extension cord is used.
• 12/3 AWG at 50 Feet
• 10/3 AWG at 100 Feet
POWER SUPPLY INDICATOR LIGHT:
The power supply indicator light will help detect any faulty power supplied to the
heater such as; grounding issues, reverse polarity or missing/poor connections
Warning Light Indications
Green Light ……………… Meets Power Requirements
Solid Red Light………….. Reverse Polarity
Solid Red & Green Light… Ground Issue
ATTENTION: IF SOLID RED GREEN IS INDICATED, MAKE
CORRECTIONS TO POWER SUPPLY BEFORE TURNING HEATER ON.
FAILURE TO DO SO WILL VOID ANY WARRANTY.

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CLEARANCE TO COMBUSTIBLES:
TOP FRONT SIDES REAR FLUE PIPE
3 ft 10 ft 3 ft 3 ft 3 ft
DUCTING: Hitex heater duct with a minimum temperature handling of
300 deg F. including wire reinforcement to prevent
collapsing. Heater is designed for use with 2 x 12” diameter
ducts equipped with pin lock couplings (FV-HD12).
Install ducting to outlet on the heater using pin-locks
provided on collar of ducting. Ducting should be inspected
periodically for tearing and/or wear marks. Ducting should be
stored in a dry area when not in use
FLUE PIPE: Flue pipe connection must terminate with a vertical run at
least 2 ft long. Horizontal runs should have a rise ratio of 1
in 10 away from the heater. The chimney should have a 0.2”
W.C. draft to ensure safe operation of the unit.
The vent outlet on the heater is 6” diameter. Certified
venting must be used at all times. Vent cap should be
installed in situations where downdrafts occur. All venting
must correspond with the CSA B149 standard or in its
absence, local codes.

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FV SERIES CONSTRUCTION HEATER – VENTING REQUIREMENTS
HORIZONTAL FLUE RUN - RISE RATIO 1:10
VERTICAL FLUE RUN
D
A
FLUE OUTLET OF HEATER
FLUE OUTLET OF HEATER
C
B
B
EXTERIOR WALL
1. VERTICAL FLUE TERMINATIONS
2. HORIZONTAL FLUE TERMINATIONS
A - VENT TERMINATION MUST BE A MINIMUM OF 2FT HIGHER THAN ANY POINT
WITHIN 10FT.
B - MAXIMUM HORIZONTAL RUN IS 30FT.
NOTE: 90deg ELBOW = 10ft HORIZONTAL VENT ALLOWANCE
45deg ELBOW = 5ft HORIZONTAL VENT ALLOWANCE
C - VENT TERMINATION IN HORIZONTAL POSITION MUST BE MINIMUM 4ft FROM ANY
COMBUSTABLE SURFACE
D - EXTERIOR VERTICAL VENT TERMINATION MUST BE A MINIMUM OF 2ft.
NOTE: ALL VENT TERMINATIONS MUST HAVE A RAIN CAP INSTALLED AS PER
LOCAL CODE REQUIREMENTS.

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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 should only be done by a qualified service person.
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.
3. The appliance must be kept clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
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. Fan Limit Switch (Part# FV-407A) should be replaced if the fan motor does
not shut off after the heat exchanger has cooled down.
7. High Limit Switches (Part# FV-406 and FV-437) should be checked each
season. These limit switches will ensure the burner shuts down if the
temperature exceeds 150°F degrees at rear of unit and 250°F at the outlet.
8. 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. Be sure the switch is in the “OFF” position.
2. Ensure electrical cord is grounded and heater is on a level surface.
3. Plug in supply cord to 115v, 15amp outlet.
4. Move switch to “MANUAL” position for manual control.
5. Move switch to “THERMOSTAT” position for thermostatic control.
Please Note:
1. If using Thermostat on unit, unit must be started in Thermostat position.
2. When changing between manual and thermostat operation, the heater
must be left in the “OFF” position for 30 seconds to prevent the burner
from locking out.
3. When using a generator for electrical supply, make sure the generator is
properly grounded and generator is at a 60Hz frequency.
4. In the event that a generator is being used and the generator runs out of
fuel, make sure the heater switch is in the “OFF” position before restarting
generator, failure to do so may damage heater.
TO SHUT DOWN:
1. Close main gas supply valve while heater is operating.
2. Move switch to “OFF” position.
3. Disconnect heater from gas supply.
NOTE: Fan will continue to operate after the burner shuts down. Once the
unit cools down, the fan will stop.

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IF HEATER FAILS TO START:
1. Press manual reset button at rear of burner.
2. Check gas pressure supply. Supply and manifold pressure must
follow those on rating plate.
3. Ensure proper power supply and extension cord is being used.
4. If heater fails to ignite after 3 attempts, call your supplier for service.
SAFE OPERATION PRECAUTIONS:
1. For use with propane or natural gas only. See approval label.
2. Use switch to shut down the heater. Do not try to shut down the heater
by unplugging the electrical cord.
3. Do not plug anything other that the thermostat into the “Thermostat”
plug.
4. Follow electrical requirements shown on rating plate and/or Electrical
requirements section of this manual.
5. Before removing any guards or performing any maintenance, be sure
that the main power supply is disconnected.

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COMBUSTION AIR ADJUSTMENTS:
NOTE: Proper combustion air adjustment must be achieved using a
certified combustion analyzer to ensure complete combustion.
The air adjustment should be made to achieve 10% CO
2
on natural
gas and 12% CO
2
on propane.
SETTING THE AIR ADJUSTMENT PLATE
A) Regulation of the combustion air flow is made by adjustment of the manual
AIR ADJUSTMENT PLATE (1) after loosening the FIXING SCREWS (2 and
3). The initial setting of the air adjustment plate should be made according to
Column 5 in the Burner Set-up Chart.
B) The proper number on the manual AIR
ADJUSTMENT PLATE (1) should line up
with the SETTING INDICATOR (4) on the
fan housing cover. Once set, the air ad-
justment plate should be secured in place
by tightening SCREWS 2 and 3.
C) The final position of the air adjustment
plate will vary on each installation. Use in-
struments to establish the proper settings
for maximum CO
2
.
NOTE: Variations in flue gas, 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 results.
BURNER SET-UP CHART
1 2 3 4
FIRING RATE
(BTUH) ORIFICE-NG HEAD SETTING
AIR DAMPER
SETTING
390,000
PART #
FVN-426 5 4.8 LP
4.0 NG

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TEMPERATURE FEELER GAUGE ADJUSTMENT
(ATTACHED TO FAN SWITCH)
The temperature feeler gauge is required to be always touching the heater
exchanger.
The temperature feeler gauge controls the air flow over the fan switch, which
eliminates any unnecessary fan cycling. The temperature feeler gauge can be
adjusted for different outside temperatures, by rotating the location of the
temperature feeler gauge holes. This will provide maximum performance of the
unit in different applications.
If supply air is warm (-5°C, indoor application):
Turn the temperature feeler gauge so that the holes are parallel with the heat
exchanger. This will help the fan switch to remain cool and not overheat. See
following:
If supply air is cold (under -5°C):
Turn the temperature feeler gauge so that the holes are closed off as the air goes
over the heat exchanger. This will reduce fan cycling and the unit from shutting
down.
See following:

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In extreme cold conditions, cover the holes on the temperature feeler gauge
using foil tape. Ensure that the temperature feeler gauge is readjusted for
warmer weather conditions. Failure to do so may result in burning out fan
switches – not covered under warranty.
PRINCIPAL BURNER COMPONENTS
1. Air Damper (Optional Delete)
2. Air Gate Lock-screws
3. Wiring Terminal Block
4. Air Pressure Switch
5. Motor
6. Lockout Lamps and Reset
Button
7. Cover Screw
8. Rubber Grommet
9. Capacitor
BURNER DIMENSIONS

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Model 400 A B C F G *G1 H
inches 10 5/16 12 1 3/8 13 11/16 3 3/4 10 4 1/8
mm 2262 305 35 347 95 255 61
*G1 is for LBT version
Gasket thickness is 4 millimeters
ELECTRODE AND FLAME PROBE ADJUSTMENTS
IMPORTANT: Do not turn the ignition electrode. Leave it as shown in the
drawing. If the ignition electrode is put near the ionization
probe, the amplifier of the control box may be damaged.
TYPICAL GAS TRAIN LAYOUT
FIELD SUPPLIED RIELLO SUPPLIED

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GAS TRAIN LEGEND

GAS SUPPLY & FLOW DIRECTION
OF GAS

GAS APPLIANCE PRESSURE
REGULATOR

AS SUPPLY MAIN SHUTOFF MANUAL
VALVE (FIELD SUPPLIED

SAFETY SHUTOFF GAS VALVE
(VS) 24V OR 120V SUPPLIED)
OPERATED

GAS SUPPLY PRESSURE TEST
POINT (FIELD SUPPLIED)

MAIN GAS VALVE (V1) 24V OR 120V
OPERATED SINGLE STAGE

GAS TRAIN PIPE DIAMETER SIZE(S):
BURNER G120 1/2" NPT (REDUCED
AT COMBUSTION HEAD TO 3/8")
BURNER(S) G200 & G400 3/4" NPT

GAS BURNER MANIFOLD TEST POINT
GAS SUPPLY PRESSURE RANGES:
NATURAL GAS PRESSURE:
MIN. = 4.0″WC
MAX. 10.0″WC
L.P. PROPANE GAS PRESSURE
MIN. = 8.0″WC
MAX. 13.0″WC
FIELD WIRING DIAGRAM

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FACTORY WIRING DIAGRAM
B
NOTE:
1. This burner is approved for use without the motorized air damper. In these
instances optional wiring is used
2. The SAFETY SWITCH on the 525 SE CONTROL BOX is equipped with a
contact allowing remote sensing of burner lockout. The electrical connection
is located on the CONTROL BOX terminal 4 as indicated. Should burner
lockout occur, the 525 SE CONTROL BOX will supply a power source of 120
Vac to the connection terminal. The maximum allowable current draw on this
terminal is 1 A.

PARTS DIAGRAM – FVNP-400
FV-408
FV-438
FV-434
FVP-FR
FV-403
FV-402
FV-405
FV-401
FVNP-424
FV-P08
FV-P10
FV-P11
FV-404
FV-406
FV-P01
FV-P02
FV-P06
FV-437
FV-407A
FV-448
FV-P05

FV-446 / FV-447
2103-E-CGA
FVNP-428
FVNP-429
FVNP-427
FV-431
HC5-64
FV-437
FV-407A
FV-407G
FV-433B
FV-433
FV-450SI
FV-414B
FV-409
FV-411
FVNP-430

EXPLODED FVNP-400 SPARE PARTS LIST