Flagro THC-85P Instruction Manual

THC 85P
INDUSTRIAL / COMMERCIAL SPACE HEATER
Certified to / Certifié à CGA 2.14 M2000
Conforms to / Conforme à ANSI std Z83.7 2000
Suitable for indoor or outdoor installation / Unvented / Unattended Type
OPERATING INSTRUCTIONS MANUAL
SPECIFICATIONS:
Model …………………………………………………….. THC-85P
Input ……………………………………………………… 85,000
Fuel ………………………………………………………. Propane
Inlet Pressure …………………………………………… 11” W.C.
Ignition …………………………………………………… Direct Spark Ignition
Thermostat Control…………………………………… Standard
Air Circulation …………………………………………… 450 cfm
Fuel Consumption ………………………………………. 4.25 lbs/hr
Approved …………………………………………………. cETLus listed

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THC-85P OPERATING INSTRUCTIONS MANUAL
! GENERAL HAZARD WARNING:
FAILURE TO COMPY 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, LABEL, 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.

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WARNING:
This heater is designed and approved for use in accordance with Standard ANSI Z83.7-
CGA 2.14. CHECK WITH YOUR LOCAL FIRE SAFETY AUTHORITY IF YOU HAVE
QUESTIONS ABOUT APPLICATIONS. The intended use of this device is for the
temporary heating of buildings or structure under construction, alteration or repair.
Other standards govern the use of fuel gases and heat producing products in specific
applications. Your local authority can advise you about these.
FOR TEMPORARY HEAT ONLY.
FOR USE WITH VAPOUR PROPANE ONLY.
DO NOT OPERATE IN A CLOSED OR CONFINED SPACE.
ALWAYS PROVIDE ADEQUATE VENTILATION. AIR SUPPLY – MUST BE FRESH
AIR FROM OUTDOORS OR ADEQUATE INDOOR SUPPLY.
DO NOT USE OR STORE GASOLINE OR FLAMMABLE VAPOURS OR LIQUIDS IN
THE VICINITY OF THE HEATER.
HEATER MUST BE INSTALLED ON A LEVEL SURFACE.
INSTALLATION:
The installation of this heater shall conform with local codes or, in the absence of codes
with the National Fuel Gas Code ANSI Z223.1/NFPA 54 and the Natural Gas and
Propane Installation Code, CSA B149.00. This heater must be installed by a qualified
gas technician, following local codes published by the authority having jurisdiction.
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/NFPA 58 and the Natural Gas and
Propane Installation Code, CSA B149.00.
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 the cylinder valve is in the closed position when connecting 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

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Liquefied Petroleum Gases, ANSI/NFPA 58 and CSA B149.00, Natural Gas and
Propane Installation Code.
PRESSURES: MAXIMUM INLET PRESSURES: LP: 14.0 IN. WC.
MINIMUM INLET PRESSURES: LP: 11.0 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 11.0 in. W.C.)
FUEL: This heater will operate on propane only. The manifold pressure is
listed on the approval label and the hose and regulator have been
provided. Any replacement parts must be purchased from the
manufacturer or authorized distributor.
HOSES: All hoses used to connect this heater of fuel supply must be Type 1
approved propane / natural gas hose assemblies.
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.
120v supply must be available. Please note that the motor on this
unit requires 20 amps. Ensure appropriate gauge extension cord is
used.
CLEARANCE TO COMBUSTIBLES:
TOP: 5 ft FRONT: 2 ft SIDES: 1 ft REAR: 2 ft

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DUCTING
Manufacturers ducting must be used on this heater. Flagro part number
THCP-WD12 (12” x 12 FT Hitex
A MAXIMUM OF 12 FT OF DUCTING ONLY
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.
MAINTENANCE:
1. Every heater should be inspected before each use.
2. Heaters must be inspected at least annually by a qualified service person.
3. The hose assembly 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 appliance must be kept clear and free from combustible materials, gasoline and
other flammable vapors and liquids.
5. The flow of combustion and ventilation air must not be obstructed. Be sure to check
the fan assembly and ensure the motor and blade are operating properly.
6. Compressed air may 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.

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START UP INSTRUCTIONS:
1. Connect the POL inlet on the regulator of the heater to the propane cylinder.
2. Open the cylinder valve.
3. Leak test the cylinder connection.
4. Plug in power supply to heater, Visually watch Power Supply Light
(See heater label if power is acceptable)
5. Depress the fan switch to the “ON” position. The fan motor will start and air will be
pushed through the outlet of the heater.
6. Depress the heat switch to the “ON” position. The burner should ignite and hot air
will be pushed through the outlet of the heater.
7. Set the Thermostat (if provided) to desired temperature.
8. If heater fails to ignite after 3 attempts call your supplier for service.
TO SHUT DOWN:
1. Close the cylinder valve on the propane cylinder.
2. Move “BURNER” switch to the “OFF” position, let fan run to 3 minutes, Move “FAN”
switch to the “OFF” position.
3. Disconnect heater from the cylinder.

THC-85 SERIES TROUBLESHOOTING ANALYSIS
PLEASE NOTE: In order to facilitate trouble shooting, unit panels have been removed in some of these
pictures for ease of identification onl . All panels and fasteners must be in place as provided b the
manufacturer to ensure the safe and efficient operation of this gas fuelled appliance.
PROBLEM: NO HEAT, FAN OPERATES.
POSSIBLE CAUSE: Rear of heater is blocked.
REMEDY: Ensure rear of heater is unobstructed
and proper rear clearances are maintained.
(see approval label for specifications)
POSSIBLE CAUSE:If the rear of the heater is obstructed, the snap
disc manual reset limit may trip and must be
reset manually before the fan can operate.
REMEDY: The high temperature limit switch reset button
is found behind the louvers on the rear of the heater,
ISCONNECT THE POWER TO THE HEATER.
Use a non-metallic slim tool, insert carefully through
louver opening and push the “red” button to reset the
switch OR remove the louvered rear panel door and
push the “red” reset button. Make certain to re-close
the panel before operating the appliance.
POSSIBLE CAUSE:Faulty On-Off switch.
REMEDY: Replace the switch.

PROBLEM: HEATER WILL NO LIGHT.
POSSIBLE CAUSE: Gas Supply.
REMEDY: Ensure required gas supply pressures are available to the heater.
(see approval label for specifications).
POSSIBLE CAUSE: Gas Valve / Solenoid.
REMEDY: Ensure solenoid is energized. (use volt meter).
Ensure plunder in solenoid is being activated. (use manometer at test point after solenoid).
=
POSSIBLE CAUSE: Igniter / Flame Sensor
REMEDY: Ensure the gap between the igniter and sensor is
approximately 1/8” – 3/16”. O NOT adjust the
porcelain side of the igniter as permanent damage
may result.
Check igniter wire connections.
Ensure igniter spark is strong.
Replace igniter assembly if necessary.
POSSIBLE CAUSE: Ignition Board.
REMEDY: Ensure electrical signals for igniter and gas valve /
solenoid are present.
Ensure ignition board is properly grounded.
POSSIBLE CAUSE: Thermostat.
REMEDY: Ensure that the thermostat is calling for heat (if it is,
the fan will start). Please not that as a safety measure
the thermostat is equipped with a 10 second delay.
If your heater is equipped with an optional external
thermostat check that connections are secure and restart
the heater. If the heater fails to restart, remove the optional
line thermostat and restart the heater to confirm operational
status. If the heater starts, replace the thermostat.

PROBLEM: HEATER WILL NOT REMAIN LIT AFTER START UP.
POSSIBLE CAUSE: Faulty igniter wire.
REMEDY: Check igniter wire for any damage. Replace is necessary.
POSSIBLE CAUSE: Faulty igniter / flame sensor.
REMEDY: Ensure connections are secure. Replace igniter / flame
sensor if necessary.
POSSIBLE CAUSE: Ignition board.
REMEDY: Check ground wire for proper connection.
Check polarity of extension cord compared to polarity
of plug on the heater.
Replace faulty ignition board.
POSSIBLE CAUSE: Thermostat.
REMEDY: Ensure thermostat is calling for heat. NOTE: If the
thermostat is not calling for heat, the heater will not operate.
PROBLEM: ELECTRICAL.
POSSIBLE CAUSE: All components.
REMEDY: Before replacing any component, all connections must be checked to ensure the
electrical circuit is complete. (Use volt meter and enclosed wiring diagram).
Any point in the circuit where 120v is not achieved indicates location of problem
and/or possible faulty component. NOTE: Everything downstream of the
transformer is 24v (eg. all switches and sensors).
PROBLEM: PIPING.
POSSIBLE CAUSE: All pipe fittings.
REMEDY: When loosened, tightened or replaced, the complete fitting should be removed
and approved pipe sealant applied to all male threads before reconnection

PARTS DIAGRAM - THC-85
THCP-126A
THCP-124
THCP-122
THCP-8512
THCP-8511
THCP-131
THCP-121
THCP-111
THCP-8510
THCP-122
THCP-113/THCP-114A
THCP-108A
THCP-110

THCP-109
THCP-102
THCP-104
THCP-106A
THCP-101
THCP-119
THCP-105
THCP-109
THCP-117 (LP) THCP-118 (NG)

PARTS LIST FOR THC-85
Part Number Part Description
THCP-101 CAST IRON BURNER
THCP-102 IGNITER/ FLAME SENSOR ASSEMBLY
THCP-103 IGNITER WIRE
THCP-104 120/24 VOLT TRANSFORMER
THCP-105 GAS VALVE / SOLENOID - 24V
THCP-106A IGNITION CONTROL - 120V
THCP-107A WIRING HARNESS FOR THCP-106A
THCP-108A HIGH TEMPERATURE LIMIT (OUTLET) CURRENT
THCP-109 HIGH TEMPERATURE LIMIT (BURNER)
THCP-110 AIR PROVING SAIL SWITCH
THCP-111 MAIN BURNER OR FAN SWITCH
THCP-113 MOTOR
THCP-114A FAN BLADE - THC-85
THCP-117 ORIFICE FOR THC-85LP
THCP-118 ORIFICE FOR THC-85NG
THCP-119 ORIFICE HOLDER
THCP-120 1/4" X 4 1/2" NIPPLE
THCP-120A 1/4" X 3" NIPPLE
THCP-121 ELECTRICAL SUPPLY CORD
THCP-122 SIDE HANDLES (EACH) TWO REQUIRED
THCP-123 REAR HANDLE
THCP-124 WHEELS - 10" (EACH) TWO REQUIRED
THCP-125S WHEEL SHAFT - THC-85
THCP-126A REAR FOOT - THC-85
THCP-127 3/8" X 15FT HOSE ASSEMBLY - 3/8" SAE X 3/8" NPT
THCP-129 TWO STAGE REGULATOR - 3/8" OUTLET (THC-85)
THCP-131 TENT HEATER DOOR LATCH (EACH)
THCP-132 DOOR HINGE (EACH) TWO REQUIRED
THCP-154A POWER INDICATOR LIGHT - AS OF 2014
THCP-8510 BODY PANEL FOR THC-85
THCP-8511 FRONT DOOR FOR THC-85
THCP-8512 REAR PANEL FOR THC-85

ACCESSORIES
THCP-WD12 WHITE DUCT 12" X 10FT
THCP-DA12 DUCT ADAPTER
THCP-DD DUCT DIFFUSER
THCP-HD85 HEAT DIFFUSER
THCP-TH THERMOSTAT KIT

TITLE:
SCALE:
DATE: DRAWN BY:
CHECKED BY:
DWG. NO.
IBW 07/19/10
THC Series - Wiring Diagram (SI) THC-001SI
FAN MOTOR
FAN
SWITCH
BURNER
SWITCH
120 /24 TRANSFORMER
HI LIMIT HI LIMIT
AIR PROVING SWITCH
IGNITION CONTROL
GAS VALVE
L1 (BLACK)
N (WHITE)
G (GROUND)
120 olt 24 olt
IGNITER / FLAME SENSOR
PURPLE
BROWN
WHITE
BLACK
YELLOW
SMART
INDICATOR
THC SERIES WIRING DIAGRAM 2010
B
W
G